Line data Source code
1 : /*--------------------------------------------------------------------
2 : * guc.c
3 : *
4 : * Support for grand unified configuration scheme, including SET
5 : * command, configuration file, and command line options.
6 : *
7 : * This file contains the generic option processing infrastructure.
8 : * guc_funcs.c contains SQL-level functionality, including SET/SHOW
9 : * commands and various system-administration SQL functions.
10 : * guc_tables.c contains the arrays that define all the built-in
11 : * GUC variables. Code that implements variable-specific behavior
12 : * is scattered around the system in check, assign, and show hooks.
13 : *
14 : * See src/backend/utils/misc/README for more information.
15 : *
16 : *
17 : * Copyright (c) 2000-2025, PostgreSQL Global Development Group
18 : * Written by Peter Eisentraut <peter_e@gmx.net>.
19 : *
20 : * IDENTIFICATION
21 : * src/backend/utils/misc/guc.c
22 : *
23 : *--------------------------------------------------------------------
24 : */
25 : #include "postgres.h"
26 :
27 : #include <limits.h>
28 : #include <math.h>
29 : #include <sys/stat.h>
30 : #include <unistd.h>
31 :
32 : #include "access/xact.h"
33 : #include "access/xlog.h"
34 : #include "catalog/objectaccess.h"
35 : #include "catalog/pg_authid.h"
36 : #include "catalog/pg_parameter_acl.h"
37 : #include "catalog/pg_type.h"
38 : #include "guc_internal.h"
39 : #include "libpq/pqformat.h"
40 : #include "libpq/protocol.h"
41 : #include "miscadmin.h"
42 : #include "parser/scansup.h"
43 : #include "port/pg_bitutils.h"
44 : #include "storage/fd.h"
45 : #include "storage/lwlock.h"
46 : #include "storage/shmem.h"
47 : #include "tcop/tcopprot.h"
48 : #include "utils/acl.h"
49 : #include "utils/builtins.h"
50 : #include "utils/conffiles.h"
51 : #include "utils/guc_tables.h"
52 : #include "utils/memutils.h"
53 : #include "utils/timestamp.h"
54 :
55 :
56 : #define CONFIG_FILENAME "postgresql.conf"
57 : #define HBA_FILENAME "pg_hba.conf"
58 : #define IDENT_FILENAME "pg_ident.conf"
59 :
60 : #ifdef EXEC_BACKEND
61 : #define CONFIG_EXEC_PARAMS "global/config_exec_params"
62 : #define CONFIG_EXEC_PARAMS_NEW "global/config_exec_params.new"
63 : #endif
64 :
65 : /*
66 : * Precision with which REAL type guc values are to be printed for GUC
67 : * serialization.
68 : */
69 : #define REALTYPE_PRECISION 17
70 :
71 : /*
72 : * Safe search path when executing code as the table owner, such as during
73 : * maintenance operations.
74 : */
75 : #define GUC_SAFE_SEARCH_PATH "pg_catalog, pg_temp"
76 :
77 : static int GUC_check_errcode_value;
78 :
79 : static List *reserved_class_prefix = NIL;
80 :
81 : /* global variables for check hook support */
82 : char *GUC_check_errmsg_string;
83 : char *GUC_check_errdetail_string;
84 : char *GUC_check_errhint_string;
85 :
86 :
87 : /*
88 : * Unit conversion tables.
89 : *
90 : * There are two tables, one for memory units, and another for time units.
91 : * For each supported conversion from one unit to another, we have an entry
92 : * in the table.
93 : *
94 : * To keep things simple, and to avoid possible roundoff error,
95 : * conversions are never chained. There needs to be a direct conversion
96 : * between all units (of the same type).
97 : *
98 : * The conversions for each base unit must be kept in order from greatest to
99 : * smallest human-friendly unit; convert_xxx_from_base_unit() rely on that.
100 : * (The order of the base-unit groups does not matter.)
101 : */
102 : #define MAX_UNIT_LEN 3 /* length of longest recognized unit string */
103 :
104 : typedef struct
105 : {
106 : char unit[MAX_UNIT_LEN + 1]; /* unit, as a string, like "kB" or
107 : * "min" */
108 : int base_unit; /* GUC_UNIT_XXX */
109 : double multiplier; /* Factor for converting unit -> base_unit */
110 : } unit_conversion;
111 :
112 : /* Ensure that the constants in the tables don't overflow or underflow */
113 : #if BLCKSZ < 1024 || BLCKSZ > (1024*1024)
114 : #error BLCKSZ must be between 1KB and 1MB
115 : #endif
116 : #if XLOG_BLCKSZ < 1024 || XLOG_BLCKSZ > (1024*1024)
117 : #error XLOG_BLCKSZ must be between 1KB and 1MB
118 : #endif
119 :
120 : static const char *const memory_units_hint = gettext_noop("Valid units for this parameter are \"B\", \"kB\", \"MB\", \"GB\", and \"TB\".");
121 :
122 : static const unit_conversion memory_unit_conversion_table[] =
123 : {
124 : {"TB", GUC_UNIT_BYTE, 1024.0 * 1024.0 * 1024.0 * 1024.0},
125 : {"GB", GUC_UNIT_BYTE, 1024.0 * 1024.0 * 1024.0},
126 : {"MB", GUC_UNIT_BYTE, 1024.0 * 1024.0},
127 : {"kB", GUC_UNIT_BYTE, 1024.0},
128 : {"B", GUC_UNIT_BYTE, 1.0},
129 :
130 : {"TB", GUC_UNIT_KB, 1024.0 * 1024.0 * 1024.0},
131 : {"GB", GUC_UNIT_KB, 1024.0 * 1024.0},
132 : {"MB", GUC_UNIT_KB, 1024.0},
133 : {"kB", GUC_UNIT_KB, 1.0},
134 : {"B", GUC_UNIT_KB, 1.0 / 1024.0},
135 :
136 : {"TB", GUC_UNIT_MB, 1024.0 * 1024.0},
137 : {"GB", GUC_UNIT_MB, 1024.0},
138 : {"MB", GUC_UNIT_MB, 1.0},
139 : {"kB", GUC_UNIT_MB, 1.0 / 1024.0},
140 : {"B", GUC_UNIT_MB, 1.0 / (1024.0 * 1024.0)},
141 :
142 : {"TB", GUC_UNIT_BLOCKS, (1024.0 * 1024.0 * 1024.0) / (BLCKSZ / 1024)},
143 : {"GB", GUC_UNIT_BLOCKS, (1024.0 * 1024.0) / (BLCKSZ / 1024)},
144 : {"MB", GUC_UNIT_BLOCKS, 1024.0 / (BLCKSZ / 1024)},
145 : {"kB", GUC_UNIT_BLOCKS, 1.0 / (BLCKSZ / 1024)},
146 : {"B", GUC_UNIT_BLOCKS, 1.0 / BLCKSZ},
147 :
148 : {"TB", GUC_UNIT_XBLOCKS, (1024.0 * 1024.0 * 1024.0) / (XLOG_BLCKSZ / 1024)},
149 : {"GB", GUC_UNIT_XBLOCKS, (1024.0 * 1024.0) / (XLOG_BLCKSZ / 1024)},
150 : {"MB", GUC_UNIT_XBLOCKS, 1024.0 / (XLOG_BLCKSZ / 1024)},
151 : {"kB", GUC_UNIT_XBLOCKS, 1.0 / (XLOG_BLCKSZ / 1024)},
152 : {"B", GUC_UNIT_XBLOCKS, 1.0 / XLOG_BLCKSZ},
153 :
154 : {""} /* end of table marker */
155 : };
156 :
157 : static const char *const time_units_hint = gettext_noop("Valid units for this parameter are \"us\", \"ms\", \"s\", \"min\", \"h\", and \"d\".");
158 :
159 : static const unit_conversion time_unit_conversion_table[] =
160 : {
161 : {"d", GUC_UNIT_MS, 1000 * 60 * 60 * 24},
162 : {"h", GUC_UNIT_MS, 1000 * 60 * 60},
163 : {"min", GUC_UNIT_MS, 1000 * 60},
164 : {"s", GUC_UNIT_MS, 1000},
165 : {"ms", GUC_UNIT_MS, 1},
166 : {"us", GUC_UNIT_MS, 1.0 / 1000},
167 :
168 : {"d", GUC_UNIT_S, 60 * 60 * 24},
169 : {"h", GUC_UNIT_S, 60 * 60},
170 : {"min", GUC_UNIT_S, 60},
171 : {"s", GUC_UNIT_S, 1},
172 : {"ms", GUC_UNIT_S, 1.0 / 1000},
173 : {"us", GUC_UNIT_S, 1.0 / (1000 * 1000)},
174 :
175 : {"d", GUC_UNIT_MIN, 60 * 24},
176 : {"h", GUC_UNIT_MIN, 60},
177 : {"min", GUC_UNIT_MIN, 1},
178 : {"s", GUC_UNIT_MIN, 1.0 / 60},
179 : {"ms", GUC_UNIT_MIN, 1.0 / (1000 * 60)},
180 : {"us", GUC_UNIT_MIN, 1.0 / (1000 * 1000 * 60)},
181 :
182 : {""} /* end of table marker */
183 : };
184 :
185 : /*
186 : * To allow continued support of obsolete names for GUC variables, we apply
187 : * the following mappings to any unrecognized name. Note that an old name
188 : * should be mapped to a new one only if the new variable has very similar
189 : * semantics to the old.
190 : */
191 : static const char *const map_old_guc_names[] = {
192 : "sort_mem", "work_mem",
193 : "vacuum_mem", "maintenance_work_mem",
194 : "ssl_ecdh_curve", "ssl_groups",
195 : NULL
196 : };
197 :
198 :
199 : /* Memory context holding all GUC-related data */
200 : static MemoryContext GUCMemoryContext;
201 :
202 : /*
203 : * We use a dynahash table to look up GUCs by name, or to iterate through
204 : * all the GUCs. The gucname field is redundant with gucvar->name, but
205 : * dynahash makes it too painful to not store the hash key separately.
206 : */
207 : typedef struct
208 : {
209 : const char *gucname; /* hash key */
210 : struct config_generic *gucvar; /* -> GUC's defining structure */
211 : } GUCHashEntry;
212 :
213 : static HTAB *guc_hashtab; /* entries are GUCHashEntrys */
214 :
215 : /*
216 : * In addition to the hash table, variables having certain properties are
217 : * linked into these lists, so that we can find them without scanning the
218 : * whole hash table. In most applications, only a small fraction of the
219 : * GUCs appear in these lists at any given time. The usage of the stack
220 : * and report lists is stylized enough that they can be slists, but the
221 : * nondef list has to be a dlist to avoid O(N) deletes in common cases.
222 : */
223 : static dlist_head guc_nondef_list; /* list of variables that have source
224 : * different from PGC_S_DEFAULT */
225 : static slist_head guc_stack_list; /* list of variables that have non-NULL
226 : * stack */
227 : static slist_head guc_report_list; /* list of variables that have the
228 : * GUC_NEEDS_REPORT bit set in status */
229 :
230 : static bool reporting_enabled; /* true to enable GUC_REPORT */
231 :
232 : static int GUCNestLevel = 0; /* 1 when in main transaction */
233 :
234 :
235 : static int guc_var_compare(const void *a, const void *b);
236 : static uint32 guc_name_hash(const void *key, Size keysize);
237 : static int guc_name_match(const void *key1, const void *key2, Size keysize);
238 : static void InitializeGUCOptionsFromEnvironment(void);
239 : static void InitializeOneGUCOption(struct config_generic *gconf);
240 : static void RemoveGUCFromLists(struct config_generic *gconf);
241 : static void set_guc_source(struct config_generic *gconf, GucSource newsource);
242 : static void pg_timezone_abbrev_initialize(void);
243 : static void push_old_value(struct config_generic *gconf, GucAction action);
244 : static void ReportGUCOption(struct config_generic *record);
245 : static void set_config_sourcefile(const char *name, char *sourcefile,
246 : int sourceline);
247 : static void reapply_stacked_values(struct config_generic *variable,
248 : struct config_generic *pHolder,
249 : GucStack *stack,
250 : const char *curvalue,
251 : GucContext curscontext, GucSource cursource,
252 : Oid cursrole);
253 : static void free_placeholder(struct config_generic *pHolder);
254 : static bool validate_option_array_item(const char *name, const char *value,
255 : bool skipIfNoPermissions);
256 : static void write_auto_conf_file(int fd, const char *filename, ConfigVariable *head);
257 : static void replace_auto_config_value(ConfigVariable **head_p, ConfigVariable **tail_p,
258 : const char *name, const char *value);
259 : static bool valid_custom_variable_name(const char *name);
260 : static bool assignable_custom_variable_name(const char *name, bool skip_errors,
261 : int elevel);
262 : static void do_serialize(char **destptr, Size *maxbytes,
263 : const char *fmt,...) pg_attribute_printf(3, 4);
264 : static bool call_bool_check_hook(const struct config_generic *conf, bool *newval,
265 : void **extra, GucSource source, int elevel);
266 : static bool call_int_check_hook(const struct config_generic *conf, int *newval,
267 : void **extra, GucSource source, int elevel);
268 : static bool call_real_check_hook(const struct config_generic *conf, double *newval,
269 : void **extra, GucSource source, int elevel);
270 : static bool call_string_check_hook(const struct config_generic *conf, char **newval,
271 : void **extra, GucSource source, int elevel);
272 : static bool call_enum_check_hook(const struct config_generic *conf, int *newval,
273 : void **extra, GucSource source, int elevel);
274 :
275 :
276 : /*
277 : * This function handles both actual config file (re)loads and execution of
278 : * show_all_file_settings() (i.e., the pg_file_settings view). In the latter
279 : * case we don't apply any of the settings, but we make all the usual validity
280 : * checks, and we return the ConfigVariable list so that it can be printed out
281 : * by show_all_file_settings().
282 : */
283 : ConfigVariable *
284 5908 : ProcessConfigFileInternal(GucContext context, bool applySettings, int elevel)
285 : {
286 5908 : bool error = false;
287 5908 : bool applying = false;
288 : const char *ConfFileWithError;
289 : ConfigVariable *head,
290 : *tail;
291 : HASH_SEQ_STATUS status;
292 : GUCHashEntry *hentry;
293 :
294 : /* Parse the main config file into a list of option names and values */
295 5908 : ConfFileWithError = ConfigFileName;
296 5908 : head = tail = NULL;
297 :
298 5908 : if (!ParseConfigFile(ConfigFileName, true,
299 : NULL, 0, CONF_FILE_START_DEPTH, elevel,
300 : &head, &tail))
301 : {
302 : /* Syntax error(s) detected in the file, so bail out */
303 0 : error = true;
304 0 : goto bail_out;
305 : }
306 :
307 : /*
308 : * Parse the PG_AUTOCONF_FILENAME file, if present, after the main file to
309 : * replace any parameters set by ALTER SYSTEM command. Because this file
310 : * is in the data directory, we can't read it until the DataDir has been
311 : * set.
312 : */
313 5908 : if (DataDir)
314 : {
315 3678 : if (!ParseConfigFile(PG_AUTOCONF_FILENAME, false,
316 : NULL, 0, CONF_FILE_START_DEPTH, elevel,
317 : &head, &tail))
318 : {
319 : /* Syntax error(s) detected in the file, so bail out */
320 0 : error = true;
321 0 : ConfFileWithError = PG_AUTOCONF_FILENAME;
322 0 : goto bail_out;
323 : }
324 : }
325 : else
326 : {
327 : /*
328 : * If DataDir is not set, the PG_AUTOCONF_FILENAME file cannot be
329 : * read. In this case, we don't want to accept any settings but
330 : * data_directory from postgresql.conf, because they might be
331 : * overwritten with settings in the PG_AUTOCONF_FILENAME file which
332 : * will be read later. OTOH, since data_directory isn't allowed in the
333 : * PG_AUTOCONF_FILENAME file, it will never be overwritten later.
334 : */
335 2230 : ConfigVariable *newlist = NULL;
336 :
337 : /*
338 : * Prune all items except the last "data_directory" from the list.
339 : */
340 61332 : for (ConfigVariable *item = head; item; item = item->next)
341 : {
342 59102 : if (!item->ignore &&
343 59102 : strcmp(item->name, "data_directory") == 0)
344 0 : newlist = item;
345 : }
346 :
347 2230 : if (newlist)
348 0 : newlist->next = NULL;
349 2230 : head = tail = newlist;
350 :
351 : /*
352 : * Quick exit if data_directory is not present in file.
353 : *
354 : * We need not do any further processing, in particular we don't set
355 : * PgReloadTime; that will be set soon by subsequent full loading of
356 : * the config file.
357 : */
358 2230 : if (head == NULL)
359 2230 : goto bail_out;
360 : }
361 :
362 : /*
363 : * Mark all extant GUC variables as not present in the config file. We
364 : * need this so that we can tell below which ones have been removed from
365 : * the file since we last processed it.
366 : */
367 3678 : hash_seq_init(&status, guc_hashtab);
368 1515462 : while ((hentry = (GUCHashEntry *) hash_seq_search(&status)) != NULL)
369 : {
370 1511784 : struct config_generic *gconf = hentry->gucvar;
371 :
372 1511784 : gconf->status &= ~GUC_IS_IN_FILE;
373 : }
374 :
375 : /*
376 : * Check if all the supplied option names are valid, as an additional
377 : * quasi-syntactic check on the validity of the config file. It is
378 : * important that the postmaster and all backends agree on the results of
379 : * this phase, else we will have strange inconsistencies about which
380 : * processes accept a config file update and which don't. Hence, unknown
381 : * custom variable names have to be accepted without complaint. For the
382 : * same reason, we don't attempt to validate the options' values here.
383 : *
384 : * In addition, the GUC_IS_IN_FILE flag is set on each existing GUC
385 : * variable mentioned in the file; and we detect duplicate entries in the
386 : * file and mark the earlier occurrences as ignorable.
387 : */
388 113536 : for (ConfigVariable *item = head; item; item = item->next)
389 : {
390 : struct config_generic *record;
391 :
392 : /* Ignore anything already marked as ignorable */
393 109858 : if (item->ignore)
394 0 : continue;
395 :
396 : /*
397 : * Try to find the variable; but do not create a custom placeholder if
398 : * it's not there already.
399 : */
400 109858 : record = find_option(item->name, false, true, elevel);
401 :
402 109858 : if (record)
403 : {
404 : /* If it's already marked, then this is a duplicate entry */
405 109794 : if (record->status & GUC_IS_IN_FILE)
406 : {
407 : /*
408 : * Mark the earlier occurrence(s) as dead/ignorable. We could
409 : * avoid the O(N^2) behavior here with some additional state,
410 : * but it seems unlikely to be worth the trouble.
411 : */
412 387620 : for (ConfigVariable *pitem = head; pitem != item; pitem = pitem->next)
413 : {
414 375498 : if (!pitem->ignore &&
415 333520 : strcmp(pitem->name, item->name) == 0)
416 12122 : pitem->ignore = true;
417 : }
418 : }
419 : /* Now mark it as present in file */
420 109794 : record->status |= GUC_IS_IN_FILE;
421 : }
422 64 : else if (!valid_custom_variable_name(item->name))
423 : {
424 : /* Invalid non-custom variable, so complain */
425 2 : ereport(elevel,
426 : (errcode(ERRCODE_UNDEFINED_OBJECT),
427 : errmsg("unrecognized configuration parameter \"%s\" in file \"%s\" line %d",
428 : item->name,
429 : item->filename, item->sourceline)));
430 2 : item->errmsg = pstrdup("unrecognized configuration parameter");
431 2 : error = true;
432 2 : ConfFileWithError = item->filename;
433 : }
434 : }
435 :
436 : /*
437 : * If we've detected any errors so far, we don't want to risk applying any
438 : * changes.
439 : */
440 3678 : if (error)
441 2 : goto bail_out;
442 :
443 : /* Otherwise, set flag that we're beginning to apply changes */
444 3676 : applying = true;
445 :
446 : /*
447 : * Check for variables having been removed from the config file, and
448 : * revert their reset values (and perhaps also effective values) to the
449 : * boot-time defaults. If such a variable can't be changed after startup,
450 : * report that and continue.
451 : */
452 3676 : hash_seq_init(&status, guc_hashtab);
453 1514638 : while ((hentry = (GUCHashEntry *) hash_seq_search(&status)) != NULL)
454 : {
455 1510962 : struct config_generic *gconf = hentry->gucvar;
456 :
457 1510962 : if (gconf->reset_source != PGC_S_FILE ||
458 43218 : (gconf->status & GUC_IS_IN_FILE))
459 1510958 : continue;
460 4 : if (gconf->context < PGC_SIGHUP)
461 : {
462 : /* The removal can't be effective without a restart */
463 0 : gconf->status |= GUC_PENDING_RESTART;
464 0 : ereport(elevel,
465 : (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
466 : errmsg("parameter \"%s\" cannot be changed without restarting the server",
467 : gconf->name)));
468 0 : record_config_file_error(psprintf("parameter \"%s\" cannot be changed without restarting the server",
469 : gconf->name),
470 : NULL, 0,
471 : &head, &tail);
472 0 : error = true;
473 0 : continue;
474 : }
475 :
476 : /* No more to do if we're just doing show_all_file_settings() */
477 4 : if (!applySettings)
478 0 : continue;
479 :
480 : /*
481 : * Reset any "file" sources to "default", else set_config_option will
482 : * not override those settings.
483 : */
484 4 : if (gconf->reset_source == PGC_S_FILE)
485 4 : gconf->reset_source = PGC_S_DEFAULT;
486 4 : if (gconf->source == PGC_S_FILE)
487 4 : set_guc_source(gconf, PGC_S_DEFAULT);
488 4 : for (GucStack *stack = gconf->stack; stack; stack = stack->prev)
489 : {
490 0 : if (stack->source == PGC_S_FILE)
491 0 : stack->source = PGC_S_DEFAULT;
492 : }
493 :
494 : /* Now we can re-apply the wired-in default (i.e., the boot_val) */
495 4 : if (set_config_option(gconf->name, NULL,
496 : context, PGC_S_DEFAULT,
497 : GUC_ACTION_SET, true, 0, false) > 0)
498 : {
499 : /* Log the change if appropriate */
500 4 : if (context == PGC_SIGHUP)
501 4 : ereport(elevel,
502 : (errmsg("parameter \"%s\" removed from configuration file, reset to default",
503 : gconf->name)));
504 : }
505 : }
506 :
507 : /*
508 : * Restore any variables determined by environment variables or
509 : * dynamically-computed defaults. This is a no-op except in the case
510 : * where one of these had been in the config file and is now removed.
511 : *
512 : * In particular, we *must not* do this during the postmaster's initial
513 : * loading of the file, since the timezone functions in particular should
514 : * be run only after initialization is complete.
515 : *
516 : * XXX this is an unmaintainable crock, because we have to know how to set
517 : * (or at least what to call to set) every non-PGC_INTERNAL variable that
518 : * could potentially have PGC_S_DYNAMIC_DEFAULT or PGC_S_ENV_VAR source.
519 : */
520 3676 : if (context == PGC_SIGHUP && applySettings)
521 : {
522 1442 : InitializeGUCOptionsFromEnvironment();
523 1442 : pg_timezone_abbrev_initialize();
524 : /* this selects SQL_ASCII in processes not connected to a database */
525 1442 : SetConfigOption("client_encoding", GetDatabaseEncodingName(),
526 : PGC_BACKEND, PGC_S_DYNAMIC_DEFAULT);
527 : }
528 :
529 : /*
530 : * Now apply the values from the config file.
531 : */
532 113502 : for (ConfigVariable *item = head; item; item = item->next)
533 : {
534 109828 : char *pre_value = NULL;
535 : int scres;
536 :
537 : /* Ignore anything marked as ignorable */
538 109828 : if (item->ignore)
539 12122 : continue;
540 :
541 : /* In SIGHUP cases in the postmaster, we want to report changes */
542 97706 : if (context == PGC_SIGHUP && applySettings && !IsUnderPostmaster)
543 : {
544 8322 : const char *preval = GetConfigOption(item->name, true, false);
545 :
546 : /* If option doesn't exist yet or is NULL, treat as empty string */
547 8322 : if (!preval)
548 2 : preval = "";
549 : /* must dup, else might have dangling pointer below */
550 8322 : pre_value = pstrdup(preval);
551 : }
552 :
553 97706 : scres = set_config_option(item->name, item->value,
554 : context, PGC_S_FILE,
555 : GUC_ACTION_SET, applySettings, 0, false);
556 97704 : if (scres > 0)
557 : {
558 : /* variable was updated, so log the change if appropriate */
559 80936 : if (pre_value)
560 : {
561 5278 : const char *post_value = GetConfigOption(item->name, true, false);
562 :
563 5278 : if (!post_value)
564 0 : post_value = "";
565 5278 : if (strcmp(pre_value, post_value) != 0)
566 212 : ereport(elevel,
567 : (errmsg("parameter \"%s\" changed to \"%s\"",
568 : item->name, item->value)));
569 : }
570 80936 : item->applied = true;
571 : }
572 16768 : else if (scres == 0)
573 : {
574 6 : error = true;
575 6 : item->errmsg = pstrdup("setting could not be applied");
576 6 : ConfFileWithError = item->filename;
577 : }
578 : else
579 : {
580 : /* no error, but variable's active value was not changed */
581 16762 : item->applied = true;
582 : }
583 :
584 : /*
585 : * We should update source location unless there was an error, since
586 : * even if the active value didn't change, the reset value might have.
587 : * (In the postmaster, there won't be a difference, but it does matter
588 : * in backends.)
589 : */
590 97704 : if (scres != 0 && applySettings)
591 97536 : set_config_sourcefile(item->name, item->filename,
592 : item->sourceline);
593 :
594 97704 : if (pre_value)
595 8322 : pfree(pre_value);
596 : }
597 :
598 : /* Remember when we last successfully loaded the config file. */
599 3674 : if (applySettings)
600 3668 : PgReloadTime = GetCurrentTimestamp();
601 :
602 6 : bail_out:
603 5906 : if (error && applySettings)
604 : {
605 : /* During postmaster startup, any error is fatal */
606 8 : if (context == PGC_POSTMASTER)
607 8 : ereport(ERROR,
608 : (errcode(ERRCODE_CONFIG_FILE_ERROR),
609 : errmsg("configuration file \"%s\" contains errors",
610 : ConfFileWithError)));
611 0 : else if (applying)
612 0 : ereport(elevel,
613 : (errcode(ERRCODE_CONFIG_FILE_ERROR),
614 : errmsg("configuration file \"%s\" contains errors; unaffected changes were applied",
615 : ConfFileWithError)));
616 : else
617 0 : ereport(elevel,
618 : (errcode(ERRCODE_CONFIG_FILE_ERROR),
619 : errmsg("configuration file \"%s\" contains errors; no changes were applied",
620 : ConfFileWithError)));
621 : }
622 :
623 : /* Successful or otherwise, return the collected data list */
624 5898 : return head;
625 : }
626 :
627 :
628 : /*
629 : * Some infrastructure for GUC-related memory allocation
630 : *
631 : * These functions are generally modeled on libc's malloc/realloc/etc,
632 : * but any OOM issue is reported at the specified elevel.
633 : * (Thus, control returns only if that's less than ERROR.)
634 : */
635 : void *
636 1757934 : guc_malloc(int elevel, size_t size)
637 : {
638 : void *data;
639 :
640 1757934 : data = MemoryContextAllocExtended(GUCMemoryContext, size,
641 : MCXT_ALLOC_NO_OOM);
642 1757934 : if (unlikely(data == NULL))
643 0 : ereport(elevel,
644 : (errcode(ERRCODE_OUT_OF_MEMORY),
645 : errmsg("out of memory")));
646 1757934 : return data;
647 : }
648 :
649 : void *
650 0 : guc_realloc(int elevel, void *old, size_t size)
651 : {
652 : void *data;
653 :
654 0 : if (old != NULL)
655 : {
656 : /* This is to help catch old code that malloc's GUC data. */
657 : Assert(GetMemoryChunkContext(old) == GUCMemoryContext);
658 0 : data = repalloc_extended(old, size,
659 : MCXT_ALLOC_NO_OOM);
660 : }
661 : else
662 : {
663 : /* Like realloc(3), but not like repalloc(), we allow old == NULL. */
664 0 : data = MemoryContextAllocExtended(GUCMemoryContext, size,
665 : MCXT_ALLOC_NO_OOM);
666 : }
667 0 : if (unlikely(data == NULL))
668 0 : ereport(elevel,
669 : (errcode(ERRCODE_OUT_OF_MEMORY),
670 : errmsg("out of memory")));
671 0 : return data;
672 : }
673 :
674 : char *
675 1493170 : guc_strdup(int elevel, const char *src)
676 : {
677 : char *data;
678 1493170 : size_t len = strlen(src) + 1;
679 :
680 1493170 : data = guc_malloc(elevel, len);
681 1493170 : if (likely(data != NULL))
682 1493170 : memcpy(data, src, len);
683 1493170 : return data;
684 : }
685 :
686 : void
687 1634316 : guc_free(void *ptr)
688 : {
689 : /*
690 : * Historically, GUC-related code has relied heavily on the ability to do
691 : * free(NULL), so we allow that here even though pfree() doesn't.
692 : */
693 1634316 : if (ptr != NULL)
694 : {
695 : /* This is to help catch old code that malloc's GUC data. */
696 : Assert(GetMemoryChunkContext(ptr) == GUCMemoryContext);
697 983506 : pfree(ptr);
698 : }
699 1634316 : }
700 :
701 :
702 : /*
703 : * Detect whether strval is referenced anywhere in a GUC string item
704 : */
705 : static bool
706 2308394 : string_field_used(struct config_generic *conf, char *strval)
707 : {
708 2308394 : if (strval == *(conf->_string.variable) ||
709 1269358 : strval == conf->_string.reset_val ||
710 710232 : strval == conf->_string.boot_val)
711 1598162 : return true;
712 1113630 : for (GucStack *stack = conf->stack; stack; stack = stack->prev)
713 : {
714 487394 : if (strval == stack->prior.val.stringval ||
715 403404 : strval == stack->masked.val.stringval)
716 83996 : return true;
717 : }
718 626236 : return false;
719 : }
720 :
721 : /*
722 : * Support for assigning to a field of a string GUC item. Free the prior
723 : * value if it's not referenced anywhere else in the item (including stacked
724 : * states).
725 : */
726 : static void
727 2457534 : set_string_field(struct config_generic *conf, char **field, char *newval)
728 : {
729 2457534 : char *oldval = *field;
730 :
731 : /* Do the assignment */
732 2457534 : *field = newval;
733 :
734 : /* Free old value if it's not NULL and isn't referenced anymore */
735 2457534 : if (oldval && !string_field_used(conf, oldval))
736 621636 : guc_free(oldval);
737 2457534 : }
738 :
739 : /*
740 : * Detect whether an "extra" struct is referenced anywhere in a GUC item
741 : */
742 : static bool
743 432318 : extra_field_used(struct config_generic *gconf, void *extra)
744 : {
745 432318 : if (extra == gconf->extra)
746 174254 : return true;
747 258064 : if (extra == gconf->reset_extra)
748 126958 : return true;
749 146226 : for (GucStack *stack = gconf->stack; stack; stack = stack->prev)
750 : {
751 21256 : if (extra == stack->prior.extra ||
752 15126 : extra == stack->masked.extra)
753 6136 : return true;
754 : }
755 :
756 124970 : return false;
757 : }
758 :
759 : /*
760 : * Support for assigning to an "extra" field of a GUC item. Free the prior
761 : * value if it's not referenced anywhere else in the item (including stacked
762 : * states).
763 : */
764 : static void
765 3268108 : set_extra_field(struct config_generic *gconf, void **field, void *newval)
766 : {
767 3268108 : void *oldval = *field;
768 :
769 : /* Do the assignment */
770 3268108 : *field = newval;
771 :
772 : /* Free old value if it's not NULL and isn't referenced anymore */
773 3268108 : if (oldval && !extra_field_used(gconf, oldval))
774 124450 : guc_free(oldval);
775 3268108 : }
776 :
777 : /*
778 : * Support for copying a variable's active value into a stack entry.
779 : * The "extra" field associated with the active value is copied, too.
780 : *
781 : * NB: be sure stringval and extra fields of a new stack entry are
782 : * initialized to NULL before this is used, else we'll try to guc_free() them.
783 : */
784 : static void
785 449780 : set_stack_value(struct config_generic *gconf, config_var_value *val)
786 : {
787 449780 : switch (gconf->vartype)
788 : {
789 18252 : case PGC_BOOL:
790 18252 : val->val.boolval = *gconf->_bool.variable;
791 18252 : break;
792 21954 : case PGC_INT:
793 21954 : val->val.intval = *gconf->_int.variable;
794 21954 : break;
795 8676 : case PGC_REAL:
796 8676 : val->val.realval = *gconf->_real.variable;
797 8676 : break;
798 380372 : case PGC_STRING:
799 380372 : set_string_field(gconf, &(val->val.stringval), *gconf->_string.variable);
800 380372 : break;
801 20526 : case PGC_ENUM:
802 20526 : val->val.enumval = *gconf->_enum.variable;
803 20526 : break;
804 : }
805 449780 : set_extra_field(gconf, &(val->extra), gconf->extra);
806 449780 : }
807 :
808 : /*
809 : * Support for discarding a no-longer-needed value in a stack entry.
810 : * The "extra" field associated with the stack entry is cleared, too.
811 : */
812 : static void
813 56190 : discard_stack_value(struct config_generic *gconf, config_var_value *val)
814 : {
815 56190 : switch (gconf->vartype)
816 : {
817 37068 : case PGC_BOOL:
818 : case PGC_INT:
819 : case PGC_REAL:
820 : case PGC_ENUM:
821 : /* no need to do anything */
822 37068 : break;
823 19122 : case PGC_STRING:
824 19122 : set_string_field(gconf,
825 : &(val->val.stringval),
826 : NULL);
827 19122 : break;
828 : }
829 56190 : set_extra_field(gconf, &(val->extra), NULL);
830 56190 : }
831 :
832 :
833 : /*
834 : * Fetch a palloc'd, sorted array of GUC struct pointers
835 : *
836 : * The array length is returned into *num_vars.
837 : */
838 : struct config_generic **
839 3482 : get_guc_variables(int *num_vars)
840 : {
841 : struct config_generic **result;
842 : HASH_SEQ_STATUS status;
843 : GUCHashEntry *hentry;
844 : int i;
845 :
846 3482 : *num_vars = hash_get_num_entries(guc_hashtab);
847 3482 : result = palloc(sizeof(struct config_generic *) * *num_vars);
848 :
849 : /* Extract pointers from the hash table */
850 3482 : i = 0;
851 3482 : hash_seq_init(&status, guc_hashtab);
852 1449632 : while ((hentry = (GUCHashEntry *) hash_seq_search(&status)) != NULL)
853 1446150 : result[i++] = hentry->gucvar;
854 : Assert(i == *num_vars);
855 :
856 : /* Sort by name */
857 3482 : qsort(result, *num_vars,
858 : sizeof(struct config_generic *), guc_var_compare);
859 :
860 3482 : return result;
861 : }
862 :
863 :
864 : /*
865 : * Build the GUC hash table. This is split out so that help_config.c can
866 : * extract all the variables without running all of InitializeGUCOptions.
867 : * It's not meant for use anyplace else.
868 : */
869 : void
870 2282 : build_guc_variables(void)
871 : {
872 : int size_vars;
873 2282 : int num_vars = 0;
874 : HASHCTL hash_ctl;
875 : GUCHashEntry *hentry;
876 : bool found;
877 :
878 : /*
879 : * Create the memory context that will hold all GUC-related data.
880 : */
881 : Assert(GUCMemoryContext == NULL);
882 2282 : GUCMemoryContext = AllocSetContextCreate(TopMemoryContext,
883 : "GUCMemoryContext",
884 : ALLOCSET_DEFAULT_SIZES);
885 :
886 : /*
887 : * Count all the built-in variables.
888 : */
889 940184 : for (int i = 0; ConfigureNames[i].name; i++)
890 937902 : num_vars++;
891 :
892 : /*
893 : * Create hash table with 20% slack
894 : */
895 2282 : size_vars = num_vars + num_vars / 4;
896 :
897 2282 : hash_ctl.keysize = sizeof(char *);
898 2282 : hash_ctl.entrysize = sizeof(GUCHashEntry);
899 2282 : hash_ctl.hash = guc_name_hash;
900 2282 : hash_ctl.match = guc_name_match;
901 2282 : hash_ctl.hcxt = GUCMemoryContext;
902 2282 : guc_hashtab = hash_create("GUC hash table",
903 : size_vars,
904 : &hash_ctl,
905 : HASH_ELEM | HASH_FUNCTION | HASH_COMPARE | HASH_CONTEXT);
906 :
907 940184 : for (int i = 0; ConfigureNames[i].name; i++)
908 : {
909 937902 : struct config_generic *gucvar = &ConfigureNames[i];
910 :
911 937902 : hentry = (GUCHashEntry *) hash_search(guc_hashtab,
912 937902 : &gucvar->name,
913 : HASH_ENTER,
914 : &found);
915 : Assert(!found);
916 937902 : hentry->gucvar = gucvar;
917 : }
918 :
919 : Assert(num_vars == hash_get_num_entries(guc_hashtab));
920 2282 : }
921 :
922 : /*
923 : * Add a new GUC variable to the hash of known variables. The
924 : * hash is expanded if needed.
925 : */
926 : static bool
927 18792 : add_guc_variable(struct config_generic *var, int elevel)
928 : {
929 : GUCHashEntry *hentry;
930 : bool found;
931 :
932 18792 : hentry = (GUCHashEntry *) hash_search(guc_hashtab,
933 18792 : &var->name,
934 : HASH_ENTER_NULL,
935 : &found);
936 18792 : if (unlikely(hentry == NULL))
937 : {
938 0 : ereport(elevel,
939 : (errcode(ERRCODE_OUT_OF_MEMORY),
940 : errmsg("out of memory")));
941 0 : return false; /* out of memory */
942 : }
943 : Assert(!found);
944 18792 : hentry->gucvar = var;
945 18792 : return true;
946 : }
947 :
948 : /*
949 : * Decide whether a proposed custom variable name is allowed.
950 : *
951 : * It must be two or more identifiers separated by dots, where the rules
952 : * for what is an identifier agree with scan.l. (If you change this rule,
953 : * adjust the errdetail in assignable_custom_variable_name().)
954 : */
955 : static bool
956 270 : valid_custom_variable_name(const char *name)
957 : {
958 270 : bool saw_sep = false;
959 270 : bool name_start = true;
960 :
961 5130 : for (const char *p = name; *p; p++)
962 : {
963 4872 : if (*p == GUC_QUALIFIER_SEPARATOR)
964 : {
965 242 : if (name_start)
966 0 : return false; /* empty name component */
967 242 : saw_sep = true;
968 242 : name_start = true;
969 : }
970 4630 : else if (strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZ"
971 4630 : "abcdefghijklmnopqrstuvwxyz_", *p) != NULL ||
972 16 : IS_HIGHBIT_SET(*p))
973 : {
974 : /* okay as first or non-first character */
975 4614 : name_start = false;
976 : }
977 16 : else if (!name_start && strchr("0123456789$", *p) != NULL)
978 : /* okay as non-first character */ ;
979 : else
980 12 : return false;
981 : }
982 258 : if (name_start)
983 0 : return false; /* empty name component */
984 : /* OK if we found at least one separator */
985 258 : return saw_sep;
986 : }
987 :
988 : /*
989 : * Decide whether an unrecognized variable name is allowed to be SET.
990 : *
991 : * It must pass the syntactic rules of valid_custom_variable_name(),
992 : * and it must not be in any namespace already reserved by an extension.
993 : * (We make this separate from valid_custom_variable_name() because we don't
994 : * apply the reserved-namespace test when reading configuration files.)
995 : *
996 : * If valid, return true. Otherwise, return false if skip_errors is true,
997 : * else throw a suitable error at the specified elevel (and return false
998 : * if that's less than ERROR).
999 : */
1000 : static bool
1001 222 : assignable_custom_variable_name(const char *name, bool skip_errors, int elevel)
1002 : {
1003 : /* If there's no separator, it can't be a custom variable */
1004 222 : const char *sep = strchr(name, GUC_QUALIFIER_SEPARATOR);
1005 :
1006 222 : if (sep != NULL)
1007 : {
1008 160 : size_t classLen = sep - name;
1009 : ListCell *lc;
1010 :
1011 : /* The name must be syntactically acceptable ... */
1012 160 : if (!valid_custom_variable_name(name))
1013 : {
1014 12 : if (!skip_errors)
1015 12 : ereport(elevel,
1016 : (errcode(ERRCODE_INVALID_NAME),
1017 : errmsg("invalid configuration parameter name \"%s\"",
1018 : name),
1019 : errdetail("Custom parameter names must be two or more simple identifiers separated by dots.")));
1020 0 : return false;
1021 : }
1022 : /* ... and it must not match any previously-reserved prefix */
1023 176 : foreach(lc, reserved_class_prefix)
1024 : {
1025 40 : const char *rcprefix = lfirst(lc);
1026 :
1027 40 : if (strlen(rcprefix) == classLen &&
1028 12 : strncmp(name, rcprefix, classLen) == 0)
1029 : {
1030 12 : if (!skip_errors)
1031 6 : ereport(elevel,
1032 : (errcode(ERRCODE_INVALID_NAME),
1033 : errmsg("invalid configuration parameter name \"%s\"",
1034 : name),
1035 : errdetail("\"%s\" is a reserved prefix.",
1036 : rcprefix)));
1037 6 : return false;
1038 : }
1039 : }
1040 : /* OK to create it */
1041 136 : return true;
1042 : }
1043 :
1044 : /* Unrecognized single-part name */
1045 62 : if (!skip_errors)
1046 62 : ereport(elevel,
1047 : (errcode(ERRCODE_UNDEFINED_OBJECT),
1048 : errmsg("unrecognized configuration parameter \"%s\"",
1049 : name)));
1050 0 : return false;
1051 : }
1052 :
1053 : /*
1054 : * Create and add a placeholder variable for a custom variable name.
1055 : */
1056 : static struct config_generic *
1057 122 : add_placeholder_variable(const char *name, int elevel)
1058 : {
1059 122 : size_t sz = sizeof(struct config_generic) + sizeof(char *);
1060 : struct config_generic *var;
1061 :
1062 122 : var = (struct config_generic *) guc_malloc(elevel, sz);
1063 122 : if (var == NULL)
1064 0 : return NULL;
1065 122 : memset(var, 0, sz);
1066 :
1067 122 : var->name = guc_strdup(elevel, name);
1068 122 : if (var->name == NULL)
1069 : {
1070 0 : guc_free(var);
1071 0 : return NULL;
1072 : }
1073 :
1074 122 : var->context = PGC_USERSET;
1075 122 : var->group = CUSTOM_OPTIONS;
1076 122 : var->short_desc = "GUC placeholder variable";
1077 122 : var->flags = GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE | GUC_CUSTOM_PLACEHOLDER;
1078 122 : var->vartype = PGC_STRING;
1079 :
1080 : /*
1081 : * The char* is allocated at the end of the struct since we have no
1082 : * 'static' place to point to. Note that the current value, as well as
1083 : * the boot and reset values, start out NULL.
1084 : */
1085 122 : var->_string.variable = (char **) (var + 1);
1086 :
1087 122 : if (!add_guc_variable(var, elevel))
1088 : {
1089 0 : guc_free(unconstify(char *, var->name));
1090 0 : guc_free(var);
1091 0 : return NULL;
1092 : }
1093 :
1094 122 : return var;
1095 : }
1096 :
1097 : /*
1098 : * Look up option "name". If it exists, return a pointer to its record.
1099 : * Otherwise, if create_placeholders is true and name is a valid-looking
1100 : * custom variable name, we'll create and return a placeholder record.
1101 : * Otherwise, if skip_errors is true, then we silently return NULL for
1102 : * an unrecognized or invalid name. Otherwise, the error is reported at
1103 : * error level elevel (and we return NULL if that's less than ERROR).
1104 : *
1105 : * Note: internal errors, primarily out-of-memory, draw an elevel-level
1106 : * report and NULL return regardless of skip_errors. Hence, callers must
1107 : * handle a NULL return whenever elevel < ERROR, but they should not need
1108 : * to emit any additional error message. (In practice, internal errors
1109 : * can only happen when create_placeholders is true, so callers passing
1110 : * false need not think terribly hard about this.)
1111 : */
1112 : struct config_generic *
1113 1378428 : find_option(const char *name, bool create_placeholders, bool skip_errors,
1114 : int elevel)
1115 : {
1116 : GUCHashEntry *hentry;
1117 :
1118 : Assert(name);
1119 :
1120 : /* Look it up using the hash table. */
1121 1378428 : hentry = (GUCHashEntry *) hash_search(guc_hashtab,
1122 : &name,
1123 : HASH_FIND,
1124 : NULL);
1125 1378428 : if (hentry)
1126 1378016 : return hentry->gucvar;
1127 :
1128 : /*
1129 : * See if the name is an obsolete name for a variable. We assume that the
1130 : * set of supported old names is short enough that a brute-force search is
1131 : * the best way.
1132 : */
1133 1648 : for (int i = 0; map_old_guc_names[i] != NULL; i += 2)
1134 : {
1135 1236 : if (guc_name_compare(name, map_old_guc_names[i]) == 0)
1136 0 : return find_option(map_old_guc_names[i + 1], false,
1137 : skip_errors, elevel);
1138 : }
1139 :
1140 412 : if (create_placeholders)
1141 : {
1142 : /*
1143 : * Check if the name is valid, and if so, add a placeholder.
1144 : */
1145 206 : if (assignable_custom_variable_name(name, skip_errors, elevel))
1146 122 : return add_placeholder_variable(name, elevel);
1147 : else
1148 6 : return NULL; /* error message, if any, already emitted */
1149 : }
1150 :
1151 : /* Unknown name and we're not supposed to make a placeholder */
1152 206 : if (!skip_errors)
1153 38 : ereport(elevel,
1154 : (errcode(ERRCODE_UNDEFINED_OBJECT),
1155 : errmsg("unrecognized configuration parameter \"%s\"",
1156 : name)));
1157 168 : return NULL;
1158 : }
1159 :
1160 :
1161 : /*
1162 : * comparator for qsorting an array of GUC pointers
1163 : */
1164 : static int
1165 12872744 : guc_var_compare(const void *a, const void *b)
1166 : {
1167 12872744 : const struct config_generic *ca = *(const struct config_generic *const *) a;
1168 12872744 : const struct config_generic *cb = *(const struct config_generic *const *) b;
1169 :
1170 12872744 : return guc_name_compare(ca->name, cb->name);
1171 : }
1172 :
1173 : /*
1174 : * the bare comparison function for GUC names
1175 : */
1176 : int
1177 14946236 : guc_name_compare(const char *namea, const char *nameb)
1178 : {
1179 : /*
1180 : * The temptation to use strcasecmp() here must be resisted, because the
1181 : * hash mapping has to remain stable across setlocale() calls. So, build
1182 : * our own with a simple ASCII-only downcasing.
1183 : */
1184 61758226 : while (*namea && *nameb)
1185 : {
1186 60221598 : char cha = *namea++;
1187 60221598 : char chb = *nameb++;
1188 :
1189 60221598 : if (cha >= 'A' && cha <= 'Z')
1190 260876 : cha += 'a' - 'A';
1191 60221598 : if (chb >= 'A' && chb <= 'Z')
1192 126770 : chb += 'a' - 'A';
1193 60221598 : if (cha != chb)
1194 13409608 : return cha - chb;
1195 : }
1196 1536628 : if (*namea)
1197 93208 : return 1; /* a is longer */
1198 1443420 : if (*nameb)
1199 65056 : return -1; /* b is longer */
1200 1378364 : return 0;
1201 : }
1202 :
1203 : /*
1204 : * Hash function that's compatible with guc_name_compare
1205 : */
1206 : static uint32
1207 2353908 : guc_name_hash(const void *key, Size keysize)
1208 : {
1209 2353908 : uint32 result = 0;
1210 2353908 : const char *name = *(const char *const *) key;
1211 :
1212 40505012 : while (*name)
1213 : {
1214 38151104 : char ch = *name++;
1215 :
1216 : /* Case-fold in the same way as guc_name_compare */
1217 38151104 : if (ch >= 'A' && ch <= 'Z')
1218 43136 : ch += 'a' - 'A';
1219 :
1220 : /* Merge into hash ... not very bright, but it needn't be */
1221 38151104 : result = pg_rotate_left32(result, 5);
1222 38151104 : result ^= (uint32) ch;
1223 : }
1224 2353908 : return result;
1225 : }
1226 :
1227 : /*
1228 : * Dynahash match function to use in guc_hashtab
1229 : */
1230 : static int
1231 1378132 : guc_name_match(const void *key1, const void *key2, Size keysize)
1232 : {
1233 1378132 : const char *name1 = *(const char *const *) key1;
1234 1378132 : const char *name2 = *(const char *const *) key2;
1235 :
1236 1378132 : return guc_name_compare(name1, name2);
1237 : }
1238 :
1239 :
1240 : /*
1241 : * Convert a GUC name to the form that should be used in pg_parameter_acl.
1242 : *
1243 : * We need to canonicalize entries since, for example, case should not be
1244 : * significant. In addition, we apply the map_old_guc_names[] mapping so that
1245 : * any obsolete names will be converted when stored in a new PG version.
1246 : * Note however that this function does not verify legality of the name.
1247 : *
1248 : * The result is a palloc'd string.
1249 : */
1250 : char *
1251 352 : convert_GUC_name_for_parameter_acl(const char *name)
1252 : {
1253 : char *result;
1254 :
1255 : /* Apply old-GUC-name mapping. */
1256 1408 : for (int i = 0; map_old_guc_names[i] != NULL; i += 2)
1257 : {
1258 1056 : if (guc_name_compare(name, map_old_guc_names[i]) == 0)
1259 : {
1260 0 : name = map_old_guc_names[i + 1];
1261 0 : break;
1262 : }
1263 : }
1264 :
1265 : /* Apply case-folding that matches guc_name_compare(). */
1266 352 : result = pstrdup(name);
1267 5728 : for (char *ptr = result; *ptr != '\0'; ptr++)
1268 : {
1269 5376 : char ch = *ptr;
1270 :
1271 5376 : if (ch >= 'A' && ch <= 'Z')
1272 : {
1273 12 : ch += 'a' - 'A';
1274 12 : *ptr = ch;
1275 : }
1276 : }
1277 :
1278 352 : return result;
1279 : }
1280 :
1281 : /*
1282 : * Check whether we should allow creation of a pg_parameter_acl entry
1283 : * for the given name. (This can be applied either before or after
1284 : * canonicalizing it.) Throws error if not.
1285 : */
1286 : void
1287 68 : check_GUC_name_for_parameter_acl(const char *name)
1288 : {
1289 : /* OK if the GUC exists. */
1290 68 : if (find_option(name, false, true, DEBUG5) != NULL)
1291 54 : return;
1292 : /* Otherwise, it'd better be a valid custom GUC name. */
1293 14 : (void) assignable_custom_variable_name(name, false, ERROR);
1294 : }
1295 :
1296 : /*
1297 : * Routine in charge of checking various states of a GUC.
1298 : *
1299 : * This performs two sanity checks. First, it checks that the initial
1300 : * value of a GUC is the same when declared and when loaded to prevent
1301 : * anybody looking at the C declarations of these GUCs from being fooled by
1302 : * mismatched values. Second, it checks for incorrect flag combinations.
1303 : *
1304 : * The following validation rules apply for the values:
1305 : * bool - can be false, otherwise must be same as the boot_val
1306 : * int - can be 0, otherwise must be same as the boot_val
1307 : * real - can be 0.0, otherwise must be same as the boot_val
1308 : * string - can be NULL, otherwise must be strcmp equal to the boot_val
1309 : * enum - must be same as the boot_val
1310 : */
1311 : #ifdef USE_ASSERT_CHECKING
1312 : static bool
1313 : check_GUC_init(const struct config_generic *gconf)
1314 : {
1315 : /* Checks on values */
1316 : switch (gconf->vartype)
1317 : {
1318 : case PGC_BOOL:
1319 : {
1320 : const struct config_bool *conf = &gconf->_bool;
1321 :
1322 : if (*conf->variable && !conf->boot_val)
1323 : {
1324 : elog(LOG, "GUC (PGC_BOOL) %s, boot_val=%d, C-var=%d",
1325 : gconf->name, conf->boot_val, *conf->variable);
1326 : return false;
1327 : }
1328 : break;
1329 : }
1330 : case PGC_INT:
1331 : {
1332 : const struct config_int *conf = &gconf->_int;
1333 :
1334 : if (*conf->variable != 0 && *conf->variable != conf->boot_val)
1335 : {
1336 : elog(LOG, "GUC (PGC_INT) %s, boot_val=%d, C-var=%d",
1337 : gconf->name, conf->boot_val, *conf->variable);
1338 : return false;
1339 : }
1340 : break;
1341 : }
1342 : case PGC_REAL:
1343 : {
1344 : const struct config_real *conf = &gconf->_real;
1345 :
1346 : if (*conf->variable != 0.0 && *conf->variable != conf->boot_val)
1347 : {
1348 : elog(LOG, "GUC (PGC_REAL) %s, boot_val=%g, C-var=%g",
1349 : gconf->name, conf->boot_val, *conf->variable);
1350 : return false;
1351 : }
1352 : break;
1353 : }
1354 : case PGC_STRING:
1355 : {
1356 : const struct config_string *conf = &gconf->_string;
1357 :
1358 : if (*conf->variable != NULL &&
1359 : (conf->boot_val == NULL ||
1360 : strcmp(*conf->variable, conf->boot_val) != 0))
1361 : {
1362 : elog(LOG, "GUC (PGC_STRING) %s, boot_val=%s, C-var=%s",
1363 : gconf->name, conf->boot_val ? conf->boot_val : "<null>", *conf->variable);
1364 : return false;
1365 : }
1366 : break;
1367 : }
1368 : case PGC_ENUM:
1369 : {
1370 : const struct config_enum *conf = &gconf->_enum;
1371 :
1372 : if (*conf->variable != conf->boot_val)
1373 : {
1374 : elog(LOG, "GUC (PGC_ENUM) %s, boot_val=%d, C-var=%d",
1375 : gconf->name, conf->boot_val, *conf->variable);
1376 : return false;
1377 : }
1378 : break;
1379 : }
1380 : }
1381 :
1382 : /* Flag combinations */
1383 :
1384 : /*
1385 : * GUC_NO_SHOW_ALL requires GUC_NOT_IN_SAMPLE, as a parameter not part of
1386 : * SHOW ALL should not be hidden in postgresql.conf.sample.
1387 : */
1388 : if ((gconf->flags & GUC_NO_SHOW_ALL) &&
1389 : !(gconf->flags & GUC_NOT_IN_SAMPLE))
1390 : {
1391 : elog(LOG, "GUC %s flags: NO_SHOW_ALL and !NOT_IN_SAMPLE",
1392 : gconf->name);
1393 : return false;
1394 : }
1395 :
1396 : return true;
1397 : }
1398 : #endif
1399 :
1400 : /*
1401 : * Initialize GUC options during program startup.
1402 : *
1403 : * Note that we cannot read the config file yet, since we have not yet
1404 : * processed command-line switches.
1405 : */
1406 : void
1407 2282 : InitializeGUCOptions(void)
1408 : {
1409 : HASH_SEQ_STATUS status;
1410 : GUCHashEntry *hentry;
1411 :
1412 : /*
1413 : * Before log_line_prefix could possibly receive a nonempty setting, make
1414 : * sure that timezone processing is minimally alive (see elog.c).
1415 : */
1416 2282 : pg_timezone_initialize();
1417 :
1418 : /*
1419 : * Create GUCMemoryContext and build hash table of all GUC variables.
1420 : */
1421 2282 : build_guc_variables();
1422 :
1423 : /*
1424 : * Load all variables with their compiled-in defaults, and initialize
1425 : * status fields as needed.
1426 : */
1427 2282 : hash_seq_init(&status, guc_hashtab);
1428 940184 : while ((hentry = (GUCHashEntry *) hash_seq_search(&status)) != NULL)
1429 : {
1430 : /* Check mapping between initial and default value */
1431 : Assert(check_GUC_init(hentry->gucvar));
1432 :
1433 937902 : InitializeOneGUCOption(hentry->gucvar);
1434 : }
1435 :
1436 2282 : reporting_enabled = false;
1437 :
1438 : /*
1439 : * Prevent any attempt to override the transaction modes from
1440 : * non-interactive sources.
1441 : */
1442 2282 : SetConfigOption("transaction_isolation", "read committed",
1443 : PGC_POSTMASTER, PGC_S_OVERRIDE);
1444 2282 : SetConfigOption("transaction_read_only", "no",
1445 : PGC_POSTMASTER, PGC_S_OVERRIDE);
1446 2282 : SetConfigOption("transaction_deferrable", "no",
1447 : PGC_POSTMASTER, PGC_S_OVERRIDE);
1448 :
1449 : /*
1450 : * For historical reasons, some GUC parameters can receive defaults from
1451 : * environment variables. Process those settings.
1452 : */
1453 2282 : InitializeGUCOptionsFromEnvironment();
1454 2282 : }
1455 :
1456 : /*
1457 : * Assign any GUC values that can come from the server's environment.
1458 : *
1459 : * This is called from InitializeGUCOptions, and also from ProcessConfigFile
1460 : * to deal with the possibility that a setting has been removed from
1461 : * postgresql.conf and should now get a value from the environment.
1462 : * (The latter is a kludge that should probably go away someday; if so,
1463 : * fold this back into InitializeGUCOptions.)
1464 : */
1465 : static void
1466 3724 : InitializeGUCOptionsFromEnvironment(void)
1467 : {
1468 : char *env;
1469 : ssize_t stack_rlimit;
1470 :
1471 3724 : env = getenv("PGPORT");
1472 3724 : if (env != NULL)
1473 3364 : SetConfigOption("port", env, PGC_POSTMASTER, PGC_S_ENV_VAR);
1474 :
1475 3724 : env = getenv("PGDATESTYLE");
1476 3724 : if (env != NULL)
1477 232 : SetConfigOption("datestyle", env, PGC_POSTMASTER, PGC_S_ENV_VAR);
1478 :
1479 3724 : env = getenv("PGCLIENTENCODING");
1480 3724 : if (env != NULL)
1481 30 : SetConfigOption("client_encoding", env, PGC_POSTMASTER, PGC_S_ENV_VAR);
1482 :
1483 : /*
1484 : * rlimit isn't exactly an "environment variable", but it behaves about
1485 : * the same. If we can identify the platform stack depth rlimit, increase
1486 : * default stack depth setting up to whatever is safe (but at most 2MB).
1487 : * Report the value's source as PGC_S_DYNAMIC_DEFAULT if it's 2MB, or as
1488 : * PGC_S_ENV_VAR if it's reflecting the rlimit limit.
1489 : */
1490 3724 : stack_rlimit = get_stack_depth_rlimit();
1491 3724 : if (stack_rlimit > 0)
1492 : {
1493 3724 : ssize_t new_limit = (stack_rlimit - STACK_DEPTH_SLOP) / 1024;
1494 :
1495 3724 : if (new_limit > 100)
1496 : {
1497 : GucSource source;
1498 : char limbuf[16];
1499 :
1500 3724 : if (new_limit < 2048)
1501 0 : source = PGC_S_ENV_VAR;
1502 : else
1503 : {
1504 3724 : new_limit = 2048;
1505 3724 : source = PGC_S_DYNAMIC_DEFAULT;
1506 : }
1507 3724 : snprintf(limbuf, sizeof(limbuf), "%d", (int) new_limit);
1508 3724 : SetConfigOption("max_stack_depth", limbuf,
1509 : PGC_POSTMASTER, source);
1510 : }
1511 : }
1512 3724 : }
1513 :
1514 : /*
1515 : * Initialize one GUC option variable to its compiled-in default.
1516 : *
1517 : * Note: the reason for calling check_hooks is not that we think the boot_val
1518 : * might fail, but that the hooks might wish to compute an "extra" struct.
1519 : */
1520 : static void
1521 1027768 : InitializeOneGUCOption(struct config_generic *gconf)
1522 : {
1523 1027768 : void *extra = NULL;
1524 :
1525 1027768 : gconf->status = 0;
1526 1027768 : gconf->source = PGC_S_DEFAULT;
1527 1027768 : gconf->reset_source = PGC_S_DEFAULT;
1528 1027768 : gconf->scontext = PGC_INTERNAL;
1529 1027768 : gconf->reset_scontext = PGC_INTERNAL;
1530 1027768 : gconf->srole = BOOTSTRAP_SUPERUSERID;
1531 1027768 : gconf->reset_srole = BOOTSTRAP_SUPERUSERID;
1532 1027768 : gconf->stack = NULL;
1533 1027768 : gconf->extra = NULL;
1534 1027768 : gconf->last_reported = NULL;
1535 1027768 : gconf->sourcefile = NULL;
1536 1027768 : gconf->sourceline = 0;
1537 :
1538 1027768 : switch (gconf->vartype)
1539 : {
1540 299010 : case PGC_BOOL:
1541 : {
1542 299010 : struct config_bool *conf = &gconf->_bool;
1543 299010 : bool newval = conf->boot_val;
1544 :
1545 299010 : if (!call_bool_check_hook(gconf, &newval, &extra,
1546 : PGC_S_DEFAULT, LOG))
1547 0 : elog(FATAL, "failed to initialize %s to %d",
1548 : gconf->name, (int) newval);
1549 299010 : if (conf->assign_hook)
1550 0 : conf->assign_hook(newval, extra);
1551 299010 : *conf->variable = conf->reset_val = newval;
1552 299010 : break;
1553 : }
1554 352298 : case PGC_INT:
1555 : {
1556 352298 : struct config_int *conf = &gconf->_int;
1557 352298 : int newval = conf->boot_val;
1558 :
1559 : Assert(newval >= conf->min);
1560 : Assert(newval <= conf->max);
1561 352298 : if (!call_int_check_hook(gconf, &newval, &extra,
1562 : PGC_S_DEFAULT, LOG))
1563 0 : elog(FATAL, "failed to initialize %s to %d",
1564 : gconf->name, newval);
1565 352298 : if (conf->assign_hook)
1566 28588 : conf->assign_hook(newval, extra);
1567 352298 : *conf->variable = conf->reset_val = newval;
1568 352298 : break;
1569 : }
1570 61660 : case PGC_REAL:
1571 : {
1572 61660 : struct config_real *conf = &gconf->_real;
1573 61660 : double newval = conf->boot_val;
1574 :
1575 : Assert(newval >= conf->min);
1576 : Assert(newval <= conf->max);
1577 61660 : if (!call_real_check_hook(gconf, &newval, &extra,
1578 : PGC_S_DEFAULT, LOG))
1579 0 : elog(FATAL, "failed to initialize %s to %g",
1580 : gconf->name, newval);
1581 61660 : if (conf->assign_hook)
1582 4564 : conf->assign_hook(newval, extra);
1583 61660 : *conf->variable = conf->reset_val = newval;
1584 61660 : break;
1585 : }
1586 211224 : case PGC_STRING:
1587 : {
1588 211224 : struct config_string *conf = &gconf->_string;
1589 : char *newval;
1590 :
1591 : /* non-NULL boot_val must always get strdup'd */
1592 211224 : if (conf->boot_val != NULL)
1593 192138 : newval = guc_strdup(FATAL, conf->boot_val);
1594 : else
1595 19086 : newval = NULL;
1596 :
1597 211224 : if (!call_string_check_hook(gconf, &newval, &extra,
1598 : PGC_S_DEFAULT, LOG))
1599 0 : elog(FATAL, "failed to initialize %s to \"%s\"",
1600 : gconf->name, newval ? newval : "");
1601 211224 : if (conf->assign_hook)
1602 107688 : conf->assign_hook(newval, extra);
1603 211224 : *conf->variable = conf->reset_val = newval;
1604 211224 : break;
1605 : }
1606 103576 : case PGC_ENUM:
1607 : {
1608 103576 : struct config_enum *conf = &gconf->_enum;
1609 103576 : int newval = conf->boot_val;
1610 :
1611 103576 : if (!call_enum_check_hook(gconf, &newval, &extra,
1612 : PGC_S_DEFAULT, LOG))
1613 0 : elog(FATAL, "failed to initialize %s to %d",
1614 : gconf->name, newval);
1615 103576 : if (conf->assign_hook)
1616 15974 : conf->assign_hook(newval, extra);
1617 103576 : *conf->variable = conf->reset_val = newval;
1618 103576 : break;
1619 : }
1620 : }
1621 :
1622 1027768 : gconf->extra = gconf->reset_extra = extra;
1623 1027768 : }
1624 :
1625 : /*
1626 : * Summarily remove a GUC variable from any linked lists it's in.
1627 : *
1628 : * We use this in cases where the variable is about to be deleted or reset.
1629 : * These aren't common operations, so it's okay if this is a bit slow.
1630 : */
1631 : static void
1632 71204 : RemoveGUCFromLists(struct config_generic *gconf)
1633 : {
1634 71204 : if (gconf->source != PGC_S_DEFAULT)
1635 71202 : dlist_delete(&gconf->nondef_link);
1636 71204 : if (gconf->stack != NULL)
1637 0 : slist_delete(&guc_stack_list, &gconf->stack_link);
1638 71204 : if (gconf->status & GUC_NEEDS_REPORT)
1639 8652 : slist_delete(&guc_report_list, &gconf->report_link);
1640 71204 : }
1641 :
1642 :
1643 : /*
1644 : * Select the configuration files and data directory to be used, and
1645 : * do the initial read of postgresql.conf.
1646 : *
1647 : * This is called after processing command-line switches.
1648 : * userDoption is the -D switch value if any (NULL if unspecified).
1649 : * progname is just for use in error messages.
1650 : *
1651 : * Returns true on success; on failure, prints a suitable error message
1652 : * to stderr and returns false.
1653 : */
1654 : bool
1655 2230 : SelectConfigFiles(const char *userDoption, const char *progname)
1656 : {
1657 : char *configdir;
1658 : char *fname;
1659 : bool fname_is_malloced;
1660 : struct stat stat_buf;
1661 : struct config_generic *data_directory_rec;
1662 :
1663 : /* configdir is -D option, or $PGDATA if no -D */
1664 2230 : if (userDoption)
1665 1828 : configdir = make_absolute_path(userDoption);
1666 : else
1667 402 : configdir = make_absolute_path(getenv("PGDATA"));
1668 :
1669 2230 : if (configdir && stat(configdir, &stat_buf) != 0)
1670 : {
1671 0 : write_stderr("%s: could not access directory \"%s\": %m\n",
1672 : progname,
1673 : configdir);
1674 0 : if (errno == ENOENT)
1675 0 : write_stderr("Run initdb or pg_basebackup to initialize a PostgreSQL data directory.\n");
1676 0 : goto fail;
1677 : }
1678 :
1679 : /*
1680 : * Find the configuration file: if config_file was specified on the
1681 : * command line, use it, else use configdir/postgresql.conf. In any case
1682 : * ensure the result is an absolute path, so that it will be interpreted
1683 : * the same way by future backends.
1684 : */
1685 2230 : if (ConfigFileName)
1686 : {
1687 20 : fname = make_absolute_path(ConfigFileName);
1688 20 : fname_is_malloced = true;
1689 : }
1690 2210 : else if (configdir)
1691 : {
1692 2210 : fname = guc_malloc(FATAL,
1693 2210 : strlen(configdir) + strlen(CONFIG_FILENAME) + 2);
1694 2210 : sprintf(fname, "%s/%s", configdir, CONFIG_FILENAME);
1695 2210 : fname_is_malloced = false;
1696 : }
1697 : else
1698 : {
1699 0 : write_stderr("%s does not know where to find the server configuration file.\n"
1700 : "You must specify the --config-file or -D invocation "
1701 : "option or set the PGDATA environment variable.\n",
1702 : progname);
1703 0 : goto fail;
1704 : }
1705 :
1706 : /*
1707 : * Set the ConfigFileName GUC variable to its final value, ensuring that
1708 : * it can't be overridden later.
1709 : */
1710 2230 : SetConfigOption("config_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
1711 :
1712 2230 : if (fname_is_malloced)
1713 20 : free(fname);
1714 : else
1715 2210 : guc_free(fname);
1716 :
1717 : /*
1718 : * Now read the config file for the first time.
1719 : */
1720 2230 : if (stat(ConfigFileName, &stat_buf) != 0)
1721 : {
1722 0 : write_stderr("%s: could not access the server configuration file \"%s\": %m\n",
1723 : progname, ConfigFileName);
1724 0 : goto fail;
1725 : }
1726 :
1727 : /*
1728 : * Read the configuration file for the first time. This time only the
1729 : * data_directory parameter is picked up to determine the data directory,
1730 : * so that we can read the PG_AUTOCONF_FILENAME file next time.
1731 : */
1732 2230 : ProcessConfigFile(PGC_POSTMASTER);
1733 :
1734 : /*
1735 : * If the data_directory GUC variable has been set, use that as DataDir;
1736 : * otherwise use configdir if set; else punt.
1737 : *
1738 : * Note: SetDataDir will copy and absolute-ize its argument, so we don't
1739 : * have to.
1740 : */
1741 : data_directory_rec =
1742 2230 : find_option("data_directory", false, false, PANIC);
1743 2230 : if (*data_directory_rec->_string.variable)
1744 0 : SetDataDir(*data_directory_rec->_string.variable);
1745 2230 : else if (configdir)
1746 2230 : SetDataDir(configdir);
1747 : else
1748 : {
1749 0 : write_stderr("%s does not know where to find the database system data.\n"
1750 : "This can be specified as \"data_directory\" in \"%s\", "
1751 : "or by the -D invocation option, or by the "
1752 : "PGDATA environment variable.\n",
1753 : progname, ConfigFileName);
1754 0 : goto fail;
1755 : }
1756 :
1757 : /*
1758 : * Reflect the final DataDir value back into the data_directory GUC var.
1759 : * (If you are wondering why we don't just make them a single variable,
1760 : * it's because the EXEC_BACKEND case needs DataDir to be transmitted to
1761 : * child backends specially. XXX is that still true? Given that we now
1762 : * chdir to DataDir, EXEC_BACKEND can read the config file without knowing
1763 : * DataDir in advance.)
1764 : */
1765 2230 : SetConfigOption("data_directory", DataDir, PGC_POSTMASTER, PGC_S_OVERRIDE);
1766 :
1767 : /*
1768 : * Now read the config file a second time, allowing any settings in the
1769 : * PG_AUTOCONF_FILENAME file to take effect. (This is pretty ugly, but
1770 : * since we have to determine the DataDir before we can find the autoconf
1771 : * file, the alternatives seem worse.)
1772 : */
1773 2230 : ProcessConfigFile(PGC_POSTMASTER);
1774 :
1775 : /*
1776 : * If timezone_abbreviations wasn't set in the configuration file, install
1777 : * the default value. We do it this way because we can't safely install a
1778 : * "real" value until my_exec_path is set, which may not have happened
1779 : * when InitializeGUCOptions runs, so the bootstrap default value cannot
1780 : * be the real desired default.
1781 : */
1782 2220 : pg_timezone_abbrev_initialize();
1783 :
1784 : /*
1785 : * Figure out where pg_hba.conf is, and make sure the path is absolute.
1786 : */
1787 2220 : if (HbaFileName)
1788 : {
1789 2 : fname = make_absolute_path(HbaFileName);
1790 2 : fname_is_malloced = true;
1791 : }
1792 2218 : else if (configdir)
1793 : {
1794 2218 : fname = guc_malloc(FATAL,
1795 2218 : strlen(configdir) + strlen(HBA_FILENAME) + 2);
1796 2218 : sprintf(fname, "%s/%s", configdir, HBA_FILENAME);
1797 2218 : fname_is_malloced = false;
1798 : }
1799 : else
1800 : {
1801 0 : write_stderr("%s does not know where to find the \"hba\" configuration file.\n"
1802 : "This can be specified as \"hba_file\" in \"%s\", "
1803 : "or by the -D invocation option, or by the "
1804 : "PGDATA environment variable.\n",
1805 : progname, ConfigFileName);
1806 0 : goto fail;
1807 : }
1808 2220 : SetConfigOption("hba_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
1809 :
1810 2220 : if (fname_is_malloced)
1811 2 : free(fname);
1812 : else
1813 2218 : guc_free(fname);
1814 :
1815 : /*
1816 : * Likewise for pg_ident.conf.
1817 : */
1818 2220 : if (IdentFileName)
1819 : {
1820 2 : fname = make_absolute_path(IdentFileName);
1821 2 : fname_is_malloced = true;
1822 : }
1823 2218 : else if (configdir)
1824 : {
1825 2218 : fname = guc_malloc(FATAL,
1826 2218 : strlen(configdir) + strlen(IDENT_FILENAME) + 2);
1827 2218 : sprintf(fname, "%s/%s", configdir, IDENT_FILENAME);
1828 2218 : fname_is_malloced = false;
1829 : }
1830 : else
1831 : {
1832 0 : write_stderr("%s does not know where to find the \"ident\" configuration file.\n"
1833 : "This can be specified as \"ident_file\" in \"%s\", "
1834 : "or by the -D invocation option, or by the "
1835 : "PGDATA environment variable.\n",
1836 : progname, ConfigFileName);
1837 0 : goto fail;
1838 : }
1839 2220 : SetConfigOption("ident_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
1840 :
1841 2220 : if (fname_is_malloced)
1842 2 : free(fname);
1843 : else
1844 2218 : guc_free(fname);
1845 :
1846 2220 : free(configdir);
1847 :
1848 2220 : return true;
1849 :
1850 0 : fail:
1851 0 : free(configdir);
1852 :
1853 0 : return false;
1854 : }
1855 :
1856 : /*
1857 : * pg_timezone_abbrev_initialize --- set default value if not done already
1858 : *
1859 : * This is called after initial loading of postgresql.conf. If no
1860 : * timezone_abbreviations setting was found therein, select default.
1861 : * If a non-default value is already installed, nothing will happen.
1862 : *
1863 : * This can also be called from ProcessConfigFile to establish the default
1864 : * value after a postgresql.conf entry for it is removed.
1865 : */
1866 : static void
1867 3662 : pg_timezone_abbrev_initialize(void)
1868 : {
1869 3662 : SetConfigOption("timezone_abbreviations", "Default",
1870 : PGC_POSTMASTER, PGC_S_DYNAMIC_DEFAULT);
1871 3662 : }
1872 :
1873 :
1874 : /*
1875 : * Reset all options to their saved default values (implements RESET ALL)
1876 : */
1877 : void
1878 18 : ResetAllOptions(void)
1879 : {
1880 : dlist_mutable_iter iter;
1881 :
1882 : /* We need only consider GUCs not already at PGC_S_DEFAULT */
1883 1036 : dlist_foreach_modify(iter, &guc_nondef_list)
1884 : {
1885 1018 : struct config_generic *gconf = dlist_container(struct config_generic,
1886 : nondef_link, iter.cur);
1887 :
1888 : /* Don't reset non-SET-able values */
1889 1018 : if (gconf->context != PGC_SUSET &&
1890 940 : gconf->context != PGC_USERSET)
1891 614 : continue;
1892 : /* Don't reset if special exclusion from RESET ALL */
1893 404 : if (gconf->flags & GUC_NO_RESET_ALL)
1894 90 : continue;
1895 : /* No need to reset if wasn't SET */
1896 314 : if (gconf->source <= PGC_S_OVERRIDE)
1897 274 : continue;
1898 :
1899 : /* Save old value to support transaction abort */
1900 40 : push_old_value(gconf, GUC_ACTION_SET);
1901 :
1902 40 : switch (gconf->vartype)
1903 : {
1904 20 : case PGC_BOOL:
1905 : {
1906 20 : struct config_bool *conf = &gconf->_bool;
1907 :
1908 20 : if (conf->assign_hook)
1909 0 : conf->assign_hook(conf->reset_val,
1910 : gconf->reset_extra);
1911 20 : *conf->variable = conf->reset_val;
1912 20 : set_extra_field(gconf, &gconf->extra,
1913 : gconf->reset_extra);
1914 20 : break;
1915 : }
1916 2 : case PGC_INT:
1917 : {
1918 2 : struct config_int *conf = &gconf->_int;
1919 :
1920 2 : if (conf->assign_hook)
1921 0 : conf->assign_hook(conf->reset_val,
1922 : gconf->reset_extra);
1923 2 : *conf->variable = conf->reset_val;
1924 2 : set_extra_field(gconf, &gconf->extra,
1925 : gconf->reset_extra);
1926 2 : break;
1927 : }
1928 6 : case PGC_REAL:
1929 : {
1930 6 : struct config_real *conf = &gconf->_real;
1931 :
1932 6 : if (conf->assign_hook)
1933 0 : conf->assign_hook(conf->reset_val,
1934 : gconf->reset_extra);
1935 6 : *conf->variable = conf->reset_val;
1936 6 : set_extra_field(gconf, &gconf->extra,
1937 : gconf->reset_extra);
1938 6 : break;
1939 : }
1940 10 : case PGC_STRING:
1941 : {
1942 10 : struct config_string *conf = &gconf->_string;
1943 :
1944 10 : if (conf->assign_hook)
1945 4 : conf->assign_hook(conf->reset_val,
1946 : gconf->reset_extra);
1947 10 : set_string_field(gconf, conf->variable, conf->reset_val);
1948 10 : set_extra_field(gconf, &gconf->extra,
1949 : gconf->reset_extra);
1950 10 : break;
1951 : }
1952 2 : case PGC_ENUM:
1953 : {
1954 2 : struct config_enum *conf = &gconf->_enum;
1955 :
1956 2 : if (conf->assign_hook)
1957 0 : conf->assign_hook(conf->reset_val,
1958 : gconf->reset_extra);
1959 2 : *conf->variable = conf->reset_val;
1960 2 : set_extra_field(gconf, &gconf->extra,
1961 : gconf->reset_extra);
1962 2 : break;
1963 : }
1964 : }
1965 :
1966 40 : set_guc_source(gconf, gconf->reset_source);
1967 40 : gconf->scontext = gconf->reset_scontext;
1968 40 : gconf->srole = gconf->reset_srole;
1969 :
1970 40 : if ((gconf->flags & GUC_REPORT) && !(gconf->status & GUC_NEEDS_REPORT))
1971 : {
1972 6 : gconf->status |= GUC_NEEDS_REPORT;
1973 6 : slist_push_head(&guc_report_list, &gconf->report_link);
1974 : }
1975 : }
1976 18 : }
1977 :
1978 :
1979 : /*
1980 : * Apply a change to a GUC variable's "source" field.
1981 : *
1982 : * Use this rather than just assigning, to ensure that the variable's
1983 : * membership in guc_nondef_list is updated correctly.
1984 : */
1985 : static void
1986 1415680 : set_guc_source(struct config_generic *gconf, GucSource newsource)
1987 : {
1988 : /* Adjust nondef list membership if appropriate for change */
1989 1415680 : if (gconf->source == PGC_S_DEFAULT)
1990 : {
1991 568236 : if (newsource != PGC_S_DEFAULT)
1992 568090 : dlist_push_tail(&guc_nondef_list, &gconf->nondef_link);
1993 : }
1994 : else
1995 : {
1996 847444 : if (newsource == PGC_S_DEFAULT)
1997 105214 : dlist_delete(&gconf->nondef_link);
1998 : }
1999 : /* Now update the source field */
2000 1415680 : gconf->source = newsource;
2001 1415680 : }
2002 :
2003 :
2004 : /*
2005 : * push_old_value
2006 : * Push previous state during transactional assignment to a GUC variable.
2007 : */
2008 : static void
2009 461068 : push_old_value(struct config_generic *gconf, GucAction action)
2010 : {
2011 : GucStack *stack;
2012 :
2013 : /* If we're not inside a nest level, do nothing */
2014 461068 : if (GUCNestLevel == 0)
2015 0 : return;
2016 :
2017 : /* Do we already have a stack entry of the current nest level? */
2018 461068 : stack = gconf->stack;
2019 461068 : if (stack && stack->nest_level >= GUCNestLevel)
2020 : {
2021 : /* Yes, so adjust its state if necessary */
2022 : Assert(stack->nest_level == GUCNestLevel);
2023 11300 : switch (action)
2024 : {
2025 11128 : case GUC_ACTION_SET:
2026 : /* SET overrides any prior action at same nest level */
2027 11128 : if (stack->state == GUC_SET_LOCAL)
2028 : {
2029 : /* must discard old masked value */
2030 0 : discard_stack_value(gconf, &stack->masked);
2031 : }
2032 11128 : stack->state = GUC_SET;
2033 11128 : break;
2034 172 : case GUC_ACTION_LOCAL:
2035 172 : if (stack->state == GUC_SET)
2036 : {
2037 : /* SET followed by SET LOCAL, remember SET's value */
2038 12 : stack->masked_scontext = gconf->scontext;
2039 12 : stack->masked_srole = gconf->srole;
2040 12 : set_stack_value(gconf, &stack->masked);
2041 12 : stack->state = GUC_SET_LOCAL;
2042 : }
2043 : /* in all other cases, no change to stack entry */
2044 172 : break;
2045 0 : case GUC_ACTION_SAVE:
2046 : /* Could only have a prior SAVE of same variable */
2047 : Assert(stack->state == GUC_SAVE);
2048 0 : break;
2049 : }
2050 11300 : return;
2051 : }
2052 :
2053 : /*
2054 : * Push a new stack entry
2055 : *
2056 : * We keep all the stack entries in TopTransactionContext for simplicity.
2057 : */
2058 449768 : stack = (GucStack *) MemoryContextAllocZero(TopTransactionContext,
2059 : sizeof(GucStack));
2060 :
2061 449768 : stack->prev = gconf->stack;
2062 449768 : stack->nest_level = GUCNestLevel;
2063 449768 : switch (action)
2064 : {
2065 58424 : case GUC_ACTION_SET:
2066 58424 : stack->state = GUC_SET;
2067 58424 : break;
2068 8842 : case GUC_ACTION_LOCAL:
2069 8842 : stack->state = GUC_LOCAL;
2070 8842 : break;
2071 382502 : case GUC_ACTION_SAVE:
2072 382502 : stack->state = GUC_SAVE;
2073 382502 : break;
2074 : }
2075 449768 : stack->source = gconf->source;
2076 449768 : stack->scontext = gconf->scontext;
2077 449768 : stack->srole = gconf->srole;
2078 449768 : set_stack_value(gconf, &stack->prior);
2079 :
2080 449768 : if (gconf->stack == NULL)
2081 419326 : slist_push_head(&guc_stack_list, &gconf->stack_link);
2082 449768 : gconf->stack = stack;
2083 : }
2084 :
2085 :
2086 : /*
2087 : * Do GUC processing at main transaction start.
2088 : */
2089 : void
2090 1051148 : AtStart_GUC(void)
2091 : {
2092 : /*
2093 : * The nest level should be 0 between transactions; if it isn't, somebody
2094 : * didn't call AtEOXact_GUC, or called it with the wrong nestLevel. We
2095 : * throw a warning but make no other effort to clean up.
2096 : */
2097 1051148 : if (GUCNestLevel != 0)
2098 0 : elog(WARNING, "GUC nest level = %d at transaction start",
2099 : GUCNestLevel);
2100 1051148 : GUCNestLevel = 1;
2101 1051148 : }
2102 :
2103 : /*
2104 : * Enter a new nesting level for GUC values. This is called at subtransaction
2105 : * start, and when entering a function that has proconfig settings, and in
2106 : * some other places where we want to set GUC variables transiently.
2107 : * NOTE we must not risk error here, else subtransaction start will be unhappy.
2108 : */
2109 : int
2110 443200 : NewGUCNestLevel(void)
2111 : {
2112 443200 : return ++GUCNestLevel;
2113 : }
2114 :
2115 : /*
2116 : * Set search_path to a fixed value for maintenance operations. No effect
2117 : * during bootstrap, when the search_path is already set to a fixed value and
2118 : * cannot be changed.
2119 : */
2120 : void
2121 402026 : RestrictSearchPath(void)
2122 : {
2123 402026 : if (!IsBootstrapProcessingMode())
2124 340826 : set_config_option("search_path", GUC_SAFE_SEARCH_PATH, PGC_USERSET,
2125 : PGC_S_SESSION, GUC_ACTION_SAVE, true, 0, false);
2126 402026 : }
2127 :
2128 : /*
2129 : * Do GUC processing at transaction or subtransaction commit or abort, or
2130 : * when exiting a function that has proconfig settings, or when undoing a
2131 : * transient assignment to some GUC variables. (The name is thus a bit of
2132 : * a misnomer; perhaps it should be ExitGUCNestLevel or some such.)
2133 : * During abort, we discard all GUC settings that were applied at nesting
2134 : * levels >= nestLevel. nestLevel == 1 corresponds to the main transaction.
2135 : */
2136 : void
2137 1492796 : AtEOXact_GUC(bool isCommit, int nestLevel)
2138 : {
2139 : slist_mutable_iter iter;
2140 :
2141 : /*
2142 : * Note: it's possible to get here with GUCNestLevel == nestLevel-1 during
2143 : * abort, if there is a failure during transaction start before
2144 : * AtStart_GUC is called.
2145 : */
2146 : Assert(nestLevel > 0 &&
2147 : (nestLevel <= GUCNestLevel ||
2148 : (nestLevel == GUCNestLevel + 1 && !isCommit)));
2149 :
2150 : /* We need only process GUCs having nonempty stacks */
2151 1948832 : slist_foreach_modify(iter, &guc_stack_list)
2152 : {
2153 456048 : struct config_generic *gconf = slist_container(struct config_generic,
2154 : stack_link, iter.cur);
2155 : GucStack *stack;
2156 :
2157 : /*
2158 : * Process and pop each stack entry within the nest level. To simplify
2159 : * fmgr_security_definer() and other places that use GUC_ACTION_SAVE,
2160 : * we allow failure exit from code that uses a local nest level to be
2161 : * recovered at the surrounding transaction or subtransaction abort;
2162 : * so there could be more than one stack entry to pop.
2163 : */
2164 905848 : while ((stack = gconf->stack) != NULL &&
2165 486514 : stack->nest_level >= nestLevel)
2166 : {
2167 449812 : GucStack *prev = stack->prev;
2168 449812 : bool restorePrior = false;
2169 449812 : bool restoreMasked = false;
2170 : bool changed;
2171 :
2172 : /*
2173 : * In this next bit, if we don't set either restorePrior or
2174 : * restoreMasked, we must "discard" any unwanted fields of the
2175 : * stack entries to avoid leaking memory. If we do set one of
2176 : * those flags, unused fields will be cleaned up after restoring.
2177 : */
2178 449812 : if (!isCommit) /* if abort, always restore prior value */
2179 345914 : restorePrior = true;
2180 103898 : else if (stack->state == GUC_SAVE)
2181 40776 : restorePrior = true;
2182 63122 : else if (stack->nest_level == 1)
2183 : {
2184 : /* transaction commit */
2185 63080 : if (stack->state == GUC_SET_LOCAL)
2186 12 : restoreMasked = true;
2187 63068 : else if (stack->state == GUC_SET)
2188 : {
2189 : /* we keep the current active value */
2190 56190 : discard_stack_value(gconf, &stack->prior);
2191 : }
2192 : else /* must be GUC_LOCAL */
2193 6878 : restorePrior = true;
2194 : }
2195 42 : else if (prev == NULL ||
2196 12 : prev->nest_level < stack->nest_level - 1)
2197 : {
2198 : /* decrement entry's level and do not pop it */
2199 36 : stack->nest_level--;
2200 36 : continue;
2201 : }
2202 : else
2203 : {
2204 : /*
2205 : * We have to merge this stack entry into prev. See README for
2206 : * discussion of this bit.
2207 : */
2208 6 : switch (stack->state)
2209 : {
2210 0 : case GUC_SAVE:
2211 : Assert(false); /* can't get here */
2212 0 : break;
2213 :
2214 6 : case GUC_SET:
2215 : /* next level always becomes SET */
2216 6 : discard_stack_value(gconf, &stack->prior);
2217 6 : if (prev->state == GUC_SET_LOCAL)
2218 0 : discard_stack_value(gconf, &prev->masked);
2219 6 : prev->state = GUC_SET;
2220 6 : break;
2221 :
2222 0 : case GUC_LOCAL:
2223 0 : if (prev->state == GUC_SET)
2224 : {
2225 : /* LOCAL migrates down */
2226 0 : prev->masked_scontext = stack->scontext;
2227 0 : prev->masked_srole = stack->srole;
2228 0 : prev->masked = stack->prior;
2229 0 : prev->state = GUC_SET_LOCAL;
2230 : }
2231 : else
2232 : {
2233 : /* else just forget this stack level */
2234 0 : discard_stack_value(gconf, &stack->prior);
2235 : }
2236 0 : break;
2237 :
2238 0 : case GUC_SET_LOCAL:
2239 : /* prior state at this level no longer wanted */
2240 0 : discard_stack_value(gconf, &stack->prior);
2241 : /* copy down the masked state */
2242 0 : prev->masked_scontext = stack->masked_scontext;
2243 0 : prev->masked_srole = stack->masked_srole;
2244 0 : if (prev->state == GUC_SET_LOCAL)
2245 0 : discard_stack_value(gconf, &prev->masked);
2246 0 : prev->masked = stack->masked;
2247 0 : prev->state = GUC_SET_LOCAL;
2248 0 : break;
2249 : }
2250 : }
2251 :
2252 449776 : changed = false;
2253 :
2254 449776 : if (restorePrior || restoreMasked)
2255 : {
2256 : /* Perform appropriate restoration of the stacked value */
2257 : config_var_value newvalue;
2258 : GucSource newsource;
2259 : GucContext newscontext;
2260 : Oid newsrole;
2261 :
2262 393580 : if (restoreMasked)
2263 : {
2264 12 : newvalue = stack->masked;
2265 12 : newsource = PGC_S_SESSION;
2266 12 : newscontext = stack->masked_scontext;
2267 12 : newsrole = stack->masked_srole;
2268 : }
2269 : else
2270 : {
2271 393568 : newvalue = stack->prior;
2272 393568 : newsource = stack->source;
2273 393568 : newscontext = stack->scontext;
2274 393568 : newsrole = stack->srole;
2275 : }
2276 :
2277 393580 : switch (gconf->vartype)
2278 : {
2279 3656 : case PGC_BOOL:
2280 : {
2281 3656 : struct config_bool *conf = &gconf->_bool;
2282 3656 : bool newval = newvalue.val.boolval;
2283 3656 : void *newextra = newvalue.extra;
2284 :
2285 3656 : if (*conf->variable != newval ||
2286 436 : gconf->extra != newextra)
2287 : {
2288 3220 : if (conf->assign_hook)
2289 0 : conf->assign_hook(newval, newextra);
2290 3220 : *conf->variable = newval;
2291 3220 : set_extra_field(gconf, &gconf->extra,
2292 : newextra);
2293 3220 : changed = true;
2294 : }
2295 3656 : break;
2296 : }
2297 10262 : case PGC_INT:
2298 : {
2299 10262 : struct config_int *conf = &gconf->_int;
2300 10262 : int newval = newvalue.val.intval;
2301 10262 : void *newextra = newvalue.extra;
2302 :
2303 10262 : if (*conf->variable != newval ||
2304 198 : gconf->extra != newextra)
2305 : {
2306 10064 : if (conf->assign_hook)
2307 0 : conf->assign_hook(newval, newextra);
2308 10064 : *conf->variable = newval;
2309 10064 : set_extra_field(gconf, &gconf->extra,
2310 : newextra);
2311 10064 : changed = true;
2312 : }
2313 10262 : break;
2314 : }
2315 1594 : case PGC_REAL:
2316 : {
2317 1594 : struct config_real *conf = &gconf->_real;
2318 1594 : double newval = newvalue.val.realval;
2319 1594 : void *newextra = newvalue.extra;
2320 :
2321 1594 : if (*conf->variable != newval ||
2322 24 : gconf->extra != newextra)
2323 : {
2324 1570 : if (conf->assign_hook)
2325 0 : conf->assign_hook(newval, newextra);
2326 1570 : *conf->variable = newval;
2327 1570 : set_extra_field(gconf, &gconf->extra,
2328 : newextra);
2329 1570 : changed = true;
2330 : }
2331 1594 : break;
2332 : }
2333 361246 : case PGC_STRING:
2334 : {
2335 361246 : struct config_string *conf = &gconf->_string;
2336 361246 : char *newval = newvalue.val.stringval;
2337 361246 : void *newextra = newvalue.extra;
2338 :
2339 361246 : if (*conf->variable != newval ||
2340 20 : gconf->extra != newextra)
2341 : {
2342 361226 : if (conf->assign_hook)
2343 360720 : conf->assign_hook(newval, newextra);
2344 361226 : set_string_field(gconf, conf->variable, newval);
2345 361226 : set_extra_field(gconf, &gconf->extra,
2346 : newextra);
2347 361226 : changed = true;
2348 : }
2349 :
2350 : /*
2351 : * Release stacked values if not used anymore. We
2352 : * could use discard_stack_value() here, but since
2353 : * we have type-specific code anyway, might as
2354 : * well inline it.
2355 : */
2356 361246 : set_string_field(gconf, &stack->prior.val.stringval, NULL);
2357 361246 : set_string_field(gconf, &stack->masked.val.stringval, NULL);
2358 361246 : break;
2359 : }
2360 16822 : case PGC_ENUM:
2361 : {
2362 16822 : struct config_enum *conf = &gconf->_enum;
2363 16822 : int newval = newvalue.val.enumval;
2364 16822 : void *newextra = newvalue.extra;
2365 :
2366 16822 : if (*conf->variable != newval ||
2367 1042 : gconf->extra != newextra)
2368 : {
2369 15780 : if (conf->assign_hook)
2370 30 : conf->assign_hook(newval, newextra);
2371 15780 : *conf->variable = newval;
2372 15780 : set_extra_field(gconf, &gconf->extra,
2373 : newextra);
2374 15780 : changed = true;
2375 : }
2376 16822 : break;
2377 : }
2378 : }
2379 :
2380 : /*
2381 : * Release stacked extra values if not used anymore.
2382 : */
2383 393580 : set_extra_field(gconf, &(stack->prior.extra), NULL);
2384 393580 : set_extra_field(gconf, &(stack->masked.extra), NULL);
2385 :
2386 : /* And restore source information */
2387 393580 : set_guc_source(gconf, newsource);
2388 393580 : gconf->scontext = newscontext;
2389 393580 : gconf->srole = newsrole;
2390 : }
2391 :
2392 : /*
2393 : * Pop the GUC's state stack; if it's now empty, remove the GUC
2394 : * from guc_stack_list.
2395 : */
2396 449776 : gconf->stack = prev;
2397 449776 : if (prev == NULL)
2398 419330 : slist_delete_current(&iter);
2399 449776 : pfree(stack);
2400 :
2401 : /* Report new value if we changed it */
2402 449764 : if (changed && (gconf->flags & GUC_REPORT) &&
2403 369000 : !(gconf->status & GUC_NEEDS_REPORT))
2404 : {
2405 318 : gconf->status |= GUC_NEEDS_REPORT;
2406 318 : slist_push_head(&guc_report_list, &gconf->report_link);
2407 : }
2408 : } /* end of stack-popping loop */
2409 : }
2410 :
2411 : /* Update nesting level */
2412 1492784 : GUCNestLevel = nestLevel - 1;
2413 1492784 : }
2414 :
2415 :
2416 : /*
2417 : * Start up automatic reporting of changes to variables marked GUC_REPORT.
2418 : * This is executed at completion of backend startup.
2419 : */
2420 : void
2421 26692 : BeginReportingGUCOptions(void)
2422 : {
2423 : HASH_SEQ_STATUS status;
2424 : GUCHashEntry *hentry;
2425 :
2426 : /*
2427 : * Don't do anything unless talking to an interactive frontend.
2428 : */
2429 26692 : if (whereToSendOutput != DestRemote)
2430 134 : return;
2431 :
2432 26558 : reporting_enabled = true;
2433 :
2434 : /*
2435 : * Hack for in_hot_standby: set the GUC value true if appropriate. This
2436 : * is kind of an ugly place to do it, but there's few better options.
2437 : *
2438 : * (This could be out of date by the time we actually send it, in which
2439 : * case the next ReportChangedGUCOptions call will send a duplicate
2440 : * report.)
2441 : */
2442 26558 : if (RecoveryInProgress())
2443 1216 : SetConfigOption("in_hot_standby", "true",
2444 : PGC_INTERNAL, PGC_S_OVERRIDE);
2445 :
2446 : /* Transmit initial values of interesting variables */
2447 26558 : hash_seq_init(&status, guc_hashtab);
2448 10972384 : while ((hentry = (GUCHashEntry *) hash_seq_search(&status)) != NULL)
2449 : {
2450 10919268 : struct config_generic *conf = hentry->gucvar;
2451 :
2452 10919268 : if (conf->flags & GUC_REPORT)
2453 398370 : ReportGUCOption(conf);
2454 : }
2455 : }
2456 :
2457 : /*
2458 : * ReportChangedGUCOptions: report recently-changed GUC_REPORT variables
2459 : *
2460 : * This is called just before we wait for a new client query.
2461 : *
2462 : * By handling things this way, we ensure that a ParameterStatus message
2463 : * is sent at most once per variable per query, even if the variable
2464 : * changed multiple times within the query. That's quite possible when
2465 : * using features such as function SET clauses. Function SET clauses
2466 : * also tend to cause values to change intraquery but eventually revert
2467 : * to their prevailing values; ReportGUCOption is responsible for avoiding
2468 : * redundant reports in such cases.
2469 : */
2470 : void
2471 724948 : ReportChangedGUCOptions(void)
2472 : {
2473 : slist_mutable_iter iter;
2474 :
2475 : /* Quick exit if not (yet) enabled */
2476 724948 : if (!reporting_enabled)
2477 69758 : return;
2478 :
2479 : /*
2480 : * Since in_hot_standby isn't actually changed by normal GUC actions, we
2481 : * need a hack to check whether a new value needs to be reported to the
2482 : * client. For speed, we rely on the assumption that it can never
2483 : * transition from false to true.
2484 : */
2485 655190 : if (in_hot_standby_guc && !RecoveryInProgress())
2486 6 : SetConfigOption("in_hot_standby", "false",
2487 : PGC_INTERNAL, PGC_S_OVERRIDE);
2488 :
2489 : /* Transmit new values of interesting variables */
2490 913420 : slist_foreach_modify(iter, &guc_report_list)
2491 : {
2492 258230 : struct config_generic *conf = slist_container(struct config_generic,
2493 : report_link, iter.cur);
2494 :
2495 : Assert((conf->flags & GUC_REPORT) && (conf->status & GUC_NEEDS_REPORT));
2496 258230 : ReportGUCOption(conf);
2497 258230 : conf->status &= ~GUC_NEEDS_REPORT;
2498 258230 : slist_delete_current(&iter);
2499 : }
2500 : }
2501 :
2502 : /*
2503 : * ReportGUCOption: if appropriate, transmit option value to frontend
2504 : *
2505 : * We need not transmit the value if it's the same as what we last
2506 : * transmitted.
2507 : */
2508 : static void
2509 656600 : ReportGUCOption(struct config_generic *record)
2510 : {
2511 656600 : char *val = ShowGUCOption(record, false);
2512 :
2513 656600 : if (record->last_reported == NULL ||
2514 258230 : strcmp(val, record->last_reported) != 0)
2515 : {
2516 : StringInfoData msgbuf;
2517 :
2518 413122 : pq_beginmessage(&msgbuf, PqMsg_ParameterStatus);
2519 413122 : pq_sendstring(&msgbuf, record->name);
2520 413122 : pq_sendstring(&msgbuf, val);
2521 413122 : pq_endmessage(&msgbuf);
2522 :
2523 : /*
2524 : * We need a long-lifespan copy. If guc_strdup() fails due to OOM,
2525 : * we'll set last_reported to NULL and thereby possibly make a
2526 : * duplicate report later.
2527 : */
2528 413122 : guc_free(record->last_reported);
2529 413122 : record->last_reported = guc_strdup(LOG, val);
2530 : }
2531 :
2532 656600 : pfree(val);
2533 656600 : }
2534 :
2535 : /*
2536 : * Convert a value from one of the human-friendly units ("kB", "min" etc.)
2537 : * to the given base unit. 'value' and 'unit' are the input value and unit
2538 : * to convert from (there can be trailing spaces in the unit string).
2539 : * The converted value is stored in *base_value.
2540 : * It's caller's responsibility to round off the converted value as necessary
2541 : * and check for out-of-range.
2542 : *
2543 : * Returns true on success, false if the input unit is not recognized.
2544 : */
2545 : static bool
2546 14920 : convert_to_base_unit(double value, const char *unit,
2547 : int base_unit, double *base_value)
2548 : {
2549 : char unitstr[MAX_UNIT_LEN + 1];
2550 : int unitlen;
2551 : const unit_conversion *table;
2552 :
2553 : /* extract unit string to compare to table entries */
2554 14920 : unitlen = 0;
2555 44610 : while (*unit != '\0' && !isspace((unsigned char) *unit) &&
2556 : unitlen < MAX_UNIT_LEN)
2557 29690 : unitstr[unitlen++] = *(unit++);
2558 14920 : unitstr[unitlen] = '\0';
2559 : /* allow whitespace after unit */
2560 14920 : while (isspace((unsigned char) *unit))
2561 0 : unit++;
2562 14920 : if (*unit != '\0')
2563 0 : return false; /* unit too long, or garbage after it */
2564 :
2565 : /* now search the appropriate table */
2566 14920 : if (base_unit & GUC_UNIT_MEMORY)
2567 11466 : table = memory_unit_conversion_table;
2568 : else
2569 3454 : table = time_unit_conversion_table;
2570 :
2571 179172 : for (int i = 0; *table[i].unit; i++)
2572 : {
2573 179172 : if (base_unit == table[i].base_unit &&
2574 49982 : strcmp(unitstr, table[i].unit) == 0)
2575 : {
2576 14920 : double cvalue = value * table[i].multiplier;
2577 :
2578 : /*
2579 : * If the user gave a fractional value such as "30.1GB", round it
2580 : * off to the nearest multiple of the next smaller unit, if there
2581 : * is one.
2582 : */
2583 14920 : if (*table[i + 1].unit &&
2584 14920 : base_unit == table[i + 1].base_unit)
2585 14914 : cvalue = rint(cvalue / table[i + 1].multiplier) *
2586 14914 : table[i + 1].multiplier;
2587 :
2588 14920 : *base_value = cvalue;
2589 14920 : return true;
2590 : }
2591 : }
2592 0 : return false;
2593 : }
2594 :
2595 : /*
2596 : * Convert an integer value in some base unit to a human-friendly unit.
2597 : *
2598 : * The output unit is chosen so that it's the greatest unit that can represent
2599 : * the value without loss. For example, if the base unit is GUC_UNIT_KB, 1024
2600 : * is converted to 1 MB, but 1025 is represented as 1025 kB.
2601 : */
2602 : static void
2603 764 : convert_int_from_base_unit(int64 base_value, int base_unit,
2604 : int64 *value, const char **unit)
2605 : {
2606 : const unit_conversion *table;
2607 :
2608 764 : *unit = NULL;
2609 :
2610 764 : if (base_unit & GUC_UNIT_MEMORY)
2611 656 : table = memory_unit_conversion_table;
2612 : else
2613 108 : table = time_unit_conversion_table;
2614 :
2615 5076 : for (int i = 0; *table[i].unit; i++)
2616 : {
2617 5076 : if (base_unit == table[i].base_unit)
2618 : {
2619 : /*
2620 : * Accept the first conversion that divides the value evenly. We
2621 : * assume that the conversions for each base unit are ordered from
2622 : * greatest unit to the smallest!
2623 : */
2624 2370 : if (table[i].multiplier <= 1.0 ||
2625 2256 : base_value % (int64) table[i].multiplier == 0)
2626 : {
2627 764 : *value = (int64) rint(base_value / table[i].multiplier);
2628 764 : *unit = table[i].unit;
2629 764 : break;
2630 : }
2631 : }
2632 : }
2633 :
2634 : Assert(*unit != NULL);
2635 764 : }
2636 :
2637 : /*
2638 : * Convert a floating-point value in some base unit to a human-friendly unit.
2639 : *
2640 : * Same as above, except we have to do the math a bit differently, and
2641 : * there's a possibility that we don't find any exact divisor.
2642 : */
2643 : static void
2644 268 : convert_real_from_base_unit(double base_value, int base_unit,
2645 : double *value, const char **unit)
2646 : {
2647 : const unit_conversion *table;
2648 :
2649 268 : *unit = NULL;
2650 :
2651 268 : if (base_unit & GUC_UNIT_MEMORY)
2652 0 : table = memory_unit_conversion_table;
2653 : else
2654 268 : table = time_unit_conversion_table;
2655 :
2656 1364 : for (int i = 0; *table[i].unit; i++)
2657 : {
2658 1364 : if (base_unit == table[i].base_unit)
2659 : {
2660 : /*
2661 : * Accept the first conversion that divides the value evenly; or
2662 : * if there is none, use the smallest (last) target unit.
2663 : *
2664 : * What we actually care about here is whether snprintf with "%g"
2665 : * will print the value as an integer, so the obvious test of
2666 : * "*value == rint(*value)" is too strict; roundoff error might
2667 : * make us choose an unreasonably small unit. As a compromise,
2668 : * accept a divisor that is within 1e-8 of producing an integer.
2669 : */
2670 1364 : *value = base_value / table[i].multiplier;
2671 1364 : *unit = table[i].unit;
2672 1364 : if (*value > 0 &&
2673 1364 : fabs((rint(*value) / *value) - 1.0) <= 1e-8)
2674 268 : break;
2675 : }
2676 : }
2677 :
2678 : Assert(*unit != NULL);
2679 268 : }
2680 :
2681 : /*
2682 : * Return the name of a GUC's base unit (e.g. "ms") given its flags.
2683 : * Return NULL if the GUC is unitless.
2684 : */
2685 : const char *
2686 1423344 : get_config_unit_name(int flags)
2687 : {
2688 1423344 : switch (flags & GUC_UNIT)
2689 : {
2690 1148576 : case 0:
2691 1148576 : return NULL; /* GUC has no units */
2692 17390 : case GUC_UNIT_BYTE:
2693 17390 : return "B";
2694 41736 : case GUC_UNIT_KB:
2695 41736 : return "kB";
2696 20868 : case GUC_UNIT_MB:
2697 20868 : return "MB";
2698 62604 : case GUC_UNIT_BLOCKS:
2699 : {
2700 : static char bbuf[8];
2701 :
2702 : /* initialize if first time through */
2703 62604 : if (bbuf[0] == '\0')
2704 516 : snprintf(bbuf, sizeof(bbuf), "%dkB", BLCKSZ / 1024);
2705 62604 : return bbuf;
2706 : }
2707 6956 : case GUC_UNIT_XBLOCKS:
2708 : {
2709 : static char xbuf[8];
2710 :
2711 : /* initialize if first time through */
2712 6956 : if (xbuf[0] == '\0')
2713 516 : snprintf(xbuf, sizeof(xbuf), "%dkB", XLOG_BLCKSZ / 1024);
2714 6956 : return xbuf;
2715 : }
2716 80000 : case GUC_UNIT_MS:
2717 80000 : return "ms";
2718 38258 : case GUC_UNIT_S:
2719 38258 : return "s";
2720 6956 : case GUC_UNIT_MIN:
2721 6956 : return "min";
2722 0 : default:
2723 0 : elog(ERROR, "unrecognized GUC units value: %d",
2724 : flags & GUC_UNIT);
2725 : return NULL;
2726 : }
2727 : }
2728 :
2729 :
2730 : /*
2731 : * Try to parse value as an integer. The accepted formats are the
2732 : * usual decimal, octal, or hexadecimal formats, as well as floating-point
2733 : * formats (which will be rounded to integer after any units conversion).
2734 : * Optionally, the value can be followed by a unit name if "flags" indicates
2735 : * a unit is allowed.
2736 : *
2737 : * If the string parses okay, return true, else false.
2738 : * If okay and result is not NULL, return the value in *result.
2739 : * If not okay and hintmsg is not NULL, *hintmsg is set to a suitable
2740 : * HINT message, or NULL if no hint provided.
2741 : */
2742 : bool
2743 123104 : parse_int(const char *value, int *result, int flags, const char **hintmsg)
2744 : {
2745 : /*
2746 : * We assume here that double is wide enough to represent any integer
2747 : * value with adequate precision.
2748 : */
2749 : double val;
2750 : char *endptr;
2751 :
2752 : /* To suppress compiler warnings, always set output params */
2753 123104 : if (result)
2754 123104 : *result = 0;
2755 123104 : if (hintmsg)
2756 114042 : *hintmsg = NULL;
2757 :
2758 : /*
2759 : * Try to parse as an integer (allowing octal or hex input). If the
2760 : * conversion stops at a decimal point or 'e', or overflows, re-parse as
2761 : * float. This should work fine as long as we have no unit names starting
2762 : * with 'e'. If we ever do, the test could be extended to check for a
2763 : * sign or digit after 'e', but for now that's unnecessary.
2764 : */
2765 123104 : errno = 0;
2766 123104 : val = strtol(value, &endptr, 0);
2767 123104 : if (*endptr == '.' || *endptr == 'e' || *endptr == 'E' ||
2768 123092 : errno == ERANGE)
2769 : {
2770 12 : errno = 0;
2771 12 : val = strtod(value, &endptr);
2772 : }
2773 :
2774 123104 : if (endptr == value || errno == ERANGE)
2775 22 : return false; /* no HINT for these cases */
2776 :
2777 : /* reject NaN (infinities will fail range check below) */
2778 123082 : if (isnan(val))
2779 0 : return false; /* treat same as syntax error; no HINT */
2780 :
2781 : /* allow whitespace between number and unit */
2782 123122 : while (isspace((unsigned char) *endptr))
2783 40 : endptr++;
2784 :
2785 : /* Handle possible unit */
2786 123082 : if (*endptr != '\0')
2787 : {
2788 14896 : if ((flags & GUC_UNIT) == 0)
2789 4 : return false; /* this setting does not accept a unit */
2790 :
2791 14892 : if (!convert_to_base_unit(val,
2792 : endptr, (flags & GUC_UNIT),
2793 : &val))
2794 : {
2795 : /* invalid unit, or garbage after the unit; set hint and fail. */
2796 0 : if (hintmsg)
2797 : {
2798 0 : if (flags & GUC_UNIT_MEMORY)
2799 0 : *hintmsg = memory_units_hint;
2800 : else
2801 0 : *hintmsg = time_units_hint;
2802 : }
2803 0 : return false;
2804 : }
2805 : }
2806 :
2807 : /* Round to int, then check for overflow */
2808 123078 : val = rint(val);
2809 :
2810 123078 : if (val > INT_MAX || val < INT_MIN)
2811 : {
2812 6 : if (hintmsg)
2813 6 : *hintmsg = gettext_noop("Value exceeds integer range.");
2814 6 : return false;
2815 : }
2816 :
2817 123072 : if (result)
2818 123072 : *result = (int) val;
2819 123072 : return true;
2820 : }
2821 :
2822 : /*
2823 : * Try to parse value as a floating point number in the usual format.
2824 : * Optionally, the value can be followed by a unit name if "flags" indicates
2825 : * a unit is allowed.
2826 : *
2827 : * If the string parses okay, return true, else false.
2828 : * If okay and result is not NULL, return the value in *result.
2829 : * If not okay and hintmsg is not NULL, *hintmsg is set to a suitable
2830 : * HINT message, or NULL if no hint provided.
2831 : */
2832 : bool
2833 9046 : parse_real(const char *value, double *result, int flags, const char **hintmsg)
2834 : {
2835 : double val;
2836 : char *endptr;
2837 :
2838 : /* To suppress compiler warnings, always set output params */
2839 9046 : if (result)
2840 9046 : *result = 0;
2841 9046 : if (hintmsg)
2842 8526 : *hintmsg = NULL;
2843 :
2844 9046 : errno = 0;
2845 9046 : val = strtod(value, &endptr);
2846 :
2847 9046 : if (endptr == value || errno == ERANGE)
2848 18 : return false; /* no HINT for these cases */
2849 :
2850 : /* reject NaN (infinities will fail range checks later) */
2851 9028 : if (isnan(val))
2852 6 : return false; /* treat same as syntax error; no HINT */
2853 :
2854 : /* allow whitespace between number and unit */
2855 9022 : while (isspace((unsigned char) *endptr))
2856 0 : endptr++;
2857 :
2858 : /* Handle possible unit */
2859 9022 : if (*endptr != '\0')
2860 : {
2861 32 : if ((flags & GUC_UNIT) == 0)
2862 4 : return false; /* this setting does not accept a unit */
2863 :
2864 28 : if (!convert_to_base_unit(val,
2865 : endptr, (flags & GUC_UNIT),
2866 : &val))
2867 : {
2868 : /* invalid unit, or garbage after the unit; set hint and fail. */
2869 0 : if (hintmsg)
2870 : {
2871 0 : if (flags & GUC_UNIT_MEMORY)
2872 0 : *hintmsg = memory_units_hint;
2873 : else
2874 0 : *hintmsg = time_units_hint;
2875 : }
2876 0 : return false;
2877 : }
2878 : }
2879 :
2880 9018 : if (result)
2881 9018 : *result = val;
2882 9018 : return true;
2883 : }
2884 :
2885 :
2886 : /*
2887 : * Lookup the name for an enum option with the selected value.
2888 : * Should only ever be called with known-valid values, so throws
2889 : * an elog(ERROR) if the enum option is not found.
2890 : *
2891 : * The returned string is a pointer to static data and not
2892 : * allocated for modification.
2893 : */
2894 : const char *
2895 470602 : config_enum_lookup_by_value(const struct config_generic *record, int val)
2896 : {
2897 1158784 : for (const struct config_enum_entry *entry = record->_enum.options; entry && entry->name; entry++)
2898 : {
2899 1158784 : if (entry->val == val)
2900 470602 : return entry->name;
2901 : }
2902 :
2903 0 : elog(ERROR, "could not find enum option %d for %s",
2904 : val, record->name);
2905 : return NULL; /* silence compiler */
2906 : }
2907 :
2908 :
2909 : /*
2910 : * Lookup the value for an enum option with the selected name
2911 : * (case-insensitive).
2912 : * If the enum option is found, sets the retval value and returns
2913 : * true. If it's not found, return false and retval is set to 0.
2914 : */
2915 : bool
2916 75788 : config_enum_lookup_by_name(const struct config_enum *record, const char *value,
2917 : int *retval)
2918 : {
2919 166000 : for (const struct config_enum_entry *entry = record->options; entry && entry->name; entry++)
2920 : {
2921 165962 : if (pg_strcasecmp(value, entry->name) == 0)
2922 : {
2923 75750 : *retval = entry->val;
2924 75750 : return true;
2925 : }
2926 : }
2927 :
2928 38 : *retval = 0;
2929 38 : return false;
2930 : }
2931 :
2932 :
2933 : /*
2934 : * Return a palloc'd string listing all the available options for an enum GUC
2935 : * (excluding hidden ones), separated by the given separator.
2936 : * If prefix is non-NULL, it is added before the first enum value.
2937 : * If suffix is non-NULL, it is added to the end of the string.
2938 : */
2939 : char *
2940 142138 : config_enum_get_options(const struct config_enum *record, const char *prefix,
2941 : const char *suffix, const char *separator)
2942 : {
2943 : StringInfoData retstr;
2944 : int seplen;
2945 :
2946 142138 : initStringInfo(&retstr);
2947 142138 : appendStringInfoString(&retstr, prefix);
2948 :
2949 142138 : seplen = strlen(separator);
2950 916344 : for (const struct config_enum_entry *entry = record->options; entry && entry->name; entry++)
2951 : {
2952 774206 : if (!entry->hidden)
2953 : {
2954 558534 : appendStringInfoString(&retstr, entry->name);
2955 558534 : appendBinaryStringInfo(&retstr, separator, seplen);
2956 : }
2957 : }
2958 :
2959 : /*
2960 : * All the entries may have been hidden, leaving the string empty if no
2961 : * prefix was given. This indicates a broken GUC setup, since there is no
2962 : * use for an enum without any values, so we just check to make sure we
2963 : * don't write to invalid memory instead of actually trying to do
2964 : * something smart with it.
2965 : */
2966 142138 : if (retstr.len >= seplen)
2967 : {
2968 : /* Replace final separator */
2969 142138 : retstr.data[retstr.len - seplen] = '\0';
2970 142138 : retstr.len -= seplen;
2971 : }
2972 :
2973 142138 : appendStringInfoString(&retstr, suffix);
2974 :
2975 142138 : return retstr.data;
2976 : }
2977 :
2978 : /*
2979 : * Parse and validate a proposed value for the specified configuration
2980 : * parameter.
2981 : *
2982 : * This does built-in checks (such as range limits for an integer parameter)
2983 : * and also calls any check hook the parameter may have.
2984 : *
2985 : * record: GUC variable's info record
2986 : * value: proposed value, as a string
2987 : * source: identifies source of value (check hooks may need this)
2988 : * elevel: level to log any error reports at
2989 : * newval: on success, converted parameter value is returned here
2990 : * newextra: on success, receives any "extra" data returned by check hook
2991 : * (caller must initialize *newextra to NULL)
2992 : *
2993 : * Returns true if OK, false if not (or throws error, if elevel >= ERROR)
2994 : */
2995 : static bool
2996 1036366 : parse_and_validate_value(const struct config_generic *record,
2997 : const char *value,
2998 : GucSource source, int elevel,
2999 : union config_var_val *newval, void **newextra)
3000 : {
3001 1036366 : switch (record->vartype)
3002 : {
3003 159022 : case PGC_BOOL:
3004 : {
3005 159022 : if (!parse_bool(value, &newval->boolval))
3006 : {
3007 0 : ereport(elevel,
3008 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3009 : errmsg("parameter \"%s\" requires a Boolean value",
3010 : record->name)));
3011 0 : return false;
3012 : }
3013 :
3014 159022 : if (!call_bool_check_hook(record, &newval->boolval, newextra,
3015 : source, elevel))
3016 0 : return false;
3017 : }
3018 158998 : break;
3019 113988 : case PGC_INT:
3020 : {
3021 113988 : const struct config_int *conf = &record->_int;
3022 : const char *hintmsg;
3023 :
3024 113988 : if (!parse_int(value, &newval->intval,
3025 113988 : record->flags, &hintmsg))
3026 : {
3027 0 : ereport(elevel,
3028 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3029 : errmsg("invalid value for parameter \"%s\": \"%s\"",
3030 : record->name, value),
3031 : hintmsg ? errhint("%s", _(hintmsg)) : 0));
3032 0 : return false;
3033 : }
3034 :
3035 113988 : if (newval->intval < conf->min || newval->intval > conf->max)
3036 : {
3037 4 : const char *unit = get_config_unit_name(record->flags);
3038 : const char *unitspace;
3039 :
3040 4 : if (unit)
3041 0 : unitspace = " ";
3042 : else
3043 4 : unit = unitspace = "";
3044 :
3045 4 : ereport(elevel,
3046 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3047 : errmsg("%d%s%s is outside the valid range for parameter \"%s\" (%d%s%s .. %d%s%s)",
3048 : newval->intval, unitspace, unit,
3049 : record->name,
3050 : conf->min, unitspace, unit,
3051 : conf->max, unitspace, unit)));
3052 0 : return false;
3053 : }
3054 :
3055 113984 : if (!call_int_check_hook(record, &newval->intval, newextra,
3056 : source, elevel))
3057 0 : return false;
3058 : }
3059 113984 : break;
3060 8504 : case PGC_REAL:
3061 : {
3062 8504 : const struct config_real *conf = &record->_real;
3063 : const char *hintmsg;
3064 :
3065 8504 : if (!parse_real(value, &newval->realval,
3066 8504 : record->flags, &hintmsg))
3067 : {
3068 6 : ereport(elevel,
3069 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3070 : errmsg("invalid value for parameter \"%s\": \"%s\"",
3071 : record->name, value),
3072 : hintmsg ? errhint("%s", _(hintmsg)) : 0));
3073 0 : return false;
3074 : }
3075 :
3076 8498 : if (newval->realval < conf->min || newval->realval > conf->max)
3077 : {
3078 6 : const char *unit = get_config_unit_name(record->flags);
3079 : const char *unitspace;
3080 :
3081 6 : if (unit)
3082 6 : unitspace = " ";
3083 : else
3084 0 : unit = unitspace = "";
3085 :
3086 6 : ereport(elevel,
3087 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3088 : errmsg("%g%s%s is outside the valid range for parameter \"%s\" (%g%s%s .. %g%s%s)",
3089 : newval->realval, unitspace, unit,
3090 : record->name,
3091 : conf->min, unitspace, unit,
3092 : conf->max, unitspace, unit)));
3093 0 : return false;
3094 : }
3095 :
3096 8492 : if (!call_real_check_hook(record, &newval->realval, newextra,
3097 : source, elevel))
3098 0 : return false;
3099 : }
3100 8492 : break;
3101 679064 : case PGC_STRING:
3102 : {
3103 : /*
3104 : * The value passed by the caller could be transient, so we
3105 : * always strdup it.
3106 : */
3107 679064 : newval->stringval = guc_strdup(elevel, value);
3108 679064 : if (newval->stringval == NULL)
3109 0 : return false;
3110 :
3111 : /*
3112 : * The only built-in "parsing" check we have is to apply
3113 : * truncation if GUC_IS_NAME.
3114 : */
3115 679064 : if (record->flags & GUC_IS_NAME)
3116 173902 : truncate_identifier(newval->stringval,
3117 173902 : strlen(newval->stringval),
3118 : true);
3119 :
3120 679064 : if (!call_string_check_hook(record, &newval->stringval, newextra,
3121 : source, elevel))
3122 : {
3123 6 : guc_free(newval->stringval);
3124 6 : newval->stringval = NULL;
3125 6 : return false;
3126 : }
3127 : }
3128 679012 : break;
3129 75788 : case PGC_ENUM:
3130 : {
3131 75788 : const struct config_enum *conf = &record->_enum;
3132 :
3133 75788 : if (!config_enum_lookup_by_name(conf, value, &newval->enumval))
3134 : {
3135 : char *hintmsg;
3136 :
3137 38 : hintmsg = config_enum_get_options(conf,
3138 38 : _("Available values: "),
3139 :
3140 : /*
3141 : * translator: This is the terminator of a list of entity
3142 : * names.
3143 : */
3144 38 : _("."),
3145 :
3146 : /*
3147 : * translator: This is a separator in a list of entity
3148 : * names.
3149 : */
3150 38 : _(", "));
3151 :
3152 38 : ereport(elevel,
3153 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3154 : errmsg("invalid value for parameter \"%s\": \"%s\"",
3155 : record->name, value),
3156 : hintmsg ? errhint("%s", hintmsg) : 0));
3157 :
3158 0 : if (hintmsg)
3159 0 : pfree(hintmsg);
3160 0 : return false;
3161 : }
3162 :
3163 75750 : if (!call_enum_check_hook(record, &newval->enumval, newextra,
3164 : source, elevel))
3165 0 : return false;
3166 : }
3167 75748 : break;
3168 : }
3169 :
3170 1036234 : return true;
3171 : }
3172 :
3173 :
3174 : /*
3175 : * set_config_option: sets option `name' to given value.
3176 : *
3177 : * The value should be a string, which will be parsed and converted to
3178 : * the appropriate data type. The context and source parameters indicate
3179 : * in which context this function is being called, so that it can apply the
3180 : * access restrictions properly.
3181 : *
3182 : * If value is NULL, set the option to its default value (normally the
3183 : * reset_val, but if source == PGC_S_DEFAULT we instead use the boot_val).
3184 : *
3185 : * action indicates whether to set the value globally in the session, locally
3186 : * to the current top transaction, or just for the duration of a function call.
3187 : *
3188 : * If changeVal is false then don't really set the option but do all
3189 : * the checks to see if it would work.
3190 : *
3191 : * elevel should normally be passed as zero, allowing this function to make
3192 : * its standard choice of ereport level. However some callers need to be
3193 : * able to override that choice; they should pass the ereport level to use.
3194 : *
3195 : * is_reload should be true only when called from read_nondefault_variables()
3196 : * or RestoreGUCState(), where we are trying to load some other process's
3197 : * GUC settings into a new process.
3198 : *
3199 : * Return value:
3200 : * +1: the value is valid and was successfully applied.
3201 : * 0: the name or value is invalid, or it's invalid to try to set
3202 : * this GUC now; but elevel was less than ERROR (see below).
3203 : * -1: no error detected, but the value was not applied, either
3204 : * because changeVal is false or there is some overriding setting.
3205 : *
3206 : * If there is an error (non-existing option, invalid value, etc) then an
3207 : * ereport(ERROR) is thrown *unless* this is called for a source for which
3208 : * we don't want an ERROR (currently, those are defaults, the config file,
3209 : * and per-database or per-user settings, as well as callers who specify
3210 : * a less-than-ERROR elevel). In those cases we write a suitable error
3211 : * message via ereport() and return 0.
3212 : *
3213 : * See also SetConfigOption for an external interface.
3214 : */
3215 : int
3216 906910 : set_config_option(const char *name, const char *value,
3217 : GucContext context, GucSource source,
3218 : GucAction action, bool changeVal, int elevel,
3219 : bool is_reload)
3220 : {
3221 : Oid srole;
3222 :
3223 : /*
3224 : * Non-interactive sources should be treated as having all privileges,
3225 : * except for PGC_S_CLIENT. Note in particular that this is true for
3226 : * pg_db_role_setting sources (PGC_S_GLOBAL etc): we assume a suitable
3227 : * privilege check was done when the pg_db_role_setting entry was made.
3228 : */
3229 906910 : if (source >= PGC_S_INTERACTIVE || source == PGC_S_CLIENT)
3230 485216 : srole = GetUserId();
3231 : else
3232 421694 : srole = BOOTSTRAP_SUPERUSERID;
3233 :
3234 906910 : return set_config_with_handle(name, NULL, value,
3235 : context, source, srole,
3236 : action, changeVal, elevel,
3237 : is_reload);
3238 : }
3239 :
3240 : /*
3241 : * set_config_option_ext: sets option `name' to given value.
3242 : *
3243 : * This API adds the ability to explicitly specify which role OID
3244 : * is considered to be setting the value. Most external callers can use
3245 : * set_config_option() and let it determine that based on the GucSource,
3246 : * but there are a few that are supplying a value that was determined
3247 : * in some special way and need to override the decision. Also, when
3248 : * restoring a previously-assigned value, it's important to supply the
3249 : * same role OID that set the value originally; so all guc.c callers
3250 : * that are doing that type of thing need to call this directly.
3251 : *
3252 : * Generally, srole should be GetUserId() when the source is a SQL operation,
3253 : * or BOOTSTRAP_SUPERUSERID if the source is a config file or similar.
3254 : */
3255 : int
3256 103960 : set_config_option_ext(const char *name, const char *value,
3257 : GucContext context, GucSource source, Oid srole,
3258 : GucAction action, bool changeVal, int elevel,
3259 : bool is_reload)
3260 : {
3261 103960 : return set_config_with_handle(name, NULL, value,
3262 : context, source, srole,
3263 : action, changeVal, elevel,
3264 : is_reload);
3265 : }
3266 :
3267 :
3268 : /*
3269 : * set_config_with_handle: sets option `name' to given value.
3270 : *
3271 : * This API adds the ability to pass a 'handle' argument, which can be
3272 : * obtained by the caller from get_config_handle(). NULL has no effect,
3273 : * but a non-null value avoids the need to search the GUC tables.
3274 : *
3275 : * This should be used by callers which repeatedly set the same config
3276 : * option(s), and want to avoid the overhead of a hash lookup each time.
3277 : */
3278 : int
3279 1042234 : set_config_with_handle(const char *name, config_handle *handle,
3280 : const char *value,
3281 : GucContext context, GucSource source, Oid srole,
3282 : GucAction action, bool changeVal, int elevel,
3283 : bool is_reload)
3284 : {
3285 : struct config_generic *record;
3286 : union config_var_val newval_union;
3287 1042234 : void *newextra = NULL;
3288 1042234 : bool prohibitValueChange = false;
3289 : bool makeDefault;
3290 :
3291 1042234 : if (elevel == 0)
3292 : {
3293 907106 : if (source == PGC_S_DEFAULT || source == PGC_S_FILE)
3294 : {
3295 : /*
3296 : * To avoid cluttering the log, only the postmaster bleats loudly
3297 : * about problems with the config file.
3298 : */
3299 97710 : elevel = IsUnderPostmaster ? DEBUG3 : LOG;
3300 : }
3301 809396 : else if (source == PGC_S_GLOBAL ||
3302 767170 : source == PGC_S_DATABASE ||
3303 767166 : source == PGC_S_USER ||
3304 : source == PGC_S_DATABASE_USER)
3305 42230 : elevel = WARNING;
3306 : else
3307 767166 : elevel = ERROR;
3308 : }
3309 :
3310 : /* if handle is specified, no need to look up option */
3311 1042234 : if (!handle)
3312 : {
3313 1042050 : record = find_option(name, true, false, elevel);
3314 1041978 : if (record == NULL)
3315 0 : return 0;
3316 : }
3317 : else
3318 184 : record = handle;
3319 :
3320 : /*
3321 : * GUC_ACTION_SAVE changes are acceptable during a parallel operation,
3322 : * because the current worker will also pop the change. We're probably
3323 : * dealing with a function having a proconfig entry. Only the function's
3324 : * body should observe the change, and peer workers do not share in the
3325 : * execution of a function call started by this worker.
3326 : *
3327 : * Also allow normal setting if the GUC is marked GUC_ALLOW_IN_PARALLEL.
3328 : *
3329 : * Other changes might need to affect other workers, so forbid them.
3330 : */
3331 1042162 : if (IsInParallelMode() && changeVal && action != GUC_ACTION_SAVE &&
3332 18 : (record->flags & GUC_ALLOW_IN_PARALLEL) == 0)
3333 : {
3334 0 : ereport(elevel,
3335 : (errcode(ERRCODE_INVALID_TRANSACTION_STATE),
3336 : errmsg("parameter \"%s\" cannot be set during a parallel operation",
3337 : record->name)));
3338 0 : return 0;
3339 : }
3340 :
3341 : /*
3342 : * Check if the option can be set at this time. See guc.h for the precise
3343 : * rules.
3344 : */
3345 1042162 : switch (record->context)
3346 : {
3347 132486 : case PGC_INTERNAL:
3348 132486 : if (context != PGC_INTERNAL)
3349 : {
3350 4 : ereport(elevel,
3351 : (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
3352 : errmsg("parameter \"%s\" cannot be changed",
3353 : record->name)));
3354 0 : return 0;
3355 : }
3356 132482 : break;
3357 62584 : case PGC_POSTMASTER:
3358 62584 : if (context == PGC_SIGHUP)
3359 : {
3360 : /*
3361 : * We are re-reading a PGC_POSTMASTER variable from
3362 : * postgresql.conf. We can't change the setting, so we should
3363 : * give a warning if the DBA tries to change it. However,
3364 : * because of variant formats, canonicalization by check
3365 : * hooks, etc, we can't just compare the given string directly
3366 : * to what's stored. Set a flag to check below after we have
3367 : * the final storable value.
3368 : */
3369 16052 : prohibitValueChange = true;
3370 : }
3371 46532 : else if (context != PGC_POSTMASTER)
3372 : {
3373 8 : ereport(elevel,
3374 : (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
3375 : errmsg("parameter \"%s\" cannot be changed without restarting the server",
3376 : record->name)));
3377 0 : return 0;
3378 : }
3379 62576 : break;
3380 52296 : case PGC_SIGHUP:
3381 52296 : if (context != PGC_SIGHUP && context != PGC_POSTMASTER)
3382 : {
3383 6 : ereport(elevel,
3384 : (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
3385 : errmsg("parameter \"%s\" cannot be changed now",
3386 : record->name)));
3387 0 : return 0;
3388 : }
3389 :
3390 : /*
3391 : * Hmm, the idea of the SIGHUP context is "ought to be global, but
3392 : * can be changed after postmaster start". But there's nothing
3393 : * that prevents a crafty administrator from sending SIGHUP
3394 : * signals to individual backends only.
3395 : */
3396 52290 : break;
3397 356 : case PGC_SU_BACKEND:
3398 356 : if (context == PGC_BACKEND)
3399 : {
3400 : /*
3401 : * Check whether the requesting user has been granted
3402 : * privilege to set this GUC.
3403 : */
3404 : AclResult aclresult;
3405 :
3406 0 : aclresult = pg_parameter_aclcheck(record->name, srole, ACL_SET);
3407 0 : if (aclresult != ACLCHECK_OK)
3408 : {
3409 : /* No granted privilege */
3410 0 : ereport(elevel,
3411 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
3412 : errmsg("permission denied to set parameter \"%s\"",
3413 : record->name)));
3414 0 : return 0;
3415 : }
3416 : }
3417 : /* fall through to process the same as PGC_BACKEND */
3418 : /* FALLTHROUGH */
3419 : case PGC_BACKEND:
3420 360 : if (context == PGC_SIGHUP)
3421 : {
3422 : /*
3423 : * If a PGC_BACKEND or PGC_SU_BACKEND parameter is changed in
3424 : * the config file, we want to accept the new value in the
3425 : * postmaster (whence it will propagate to
3426 : * subsequently-started backends), but ignore it in existing
3427 : * backends. This is a tad klugy, but necessary because we
3428 : * don't re-read the config file during backend start.
3429 : *
3430 : * However, if changeVal is false then plow ahead anyway since
3431 : * we are trying to find out if the value is potentially good,
3432 : * not actually use it.
3433 : *
3434 : * In EXEC_BACKEND builds, this works differently: we load all
3435 : * non-default settings from the CONFIG_EXEC_PARAMS file
3436 : * during backend start. In that case we must accept
3437 : * PGC_SIGHUP settings, so as to have the same value as if
3438 : * we'd forked from the postmaster. This can also happen when
3439 : * using RestoreGUCState() within a background worker that
3440 : * needs to have the same settings as the user backend that
3441 : * started it. is_reload will be true when either situation
3442 : * applies.
3443 : */
3444 212 : if (IsUnderPostmaster && changeVal && !is_reload)
3445 106 : return -1;
3446 : }
3447 148 : else if (context != PGC_POSTMASTER &&
3448 8 : context != PGC_BACKEND &&
3449 8 : context != PGC_SU_BACKEND &&
3450 : source != PGC_S_CLIENT)
3451 : {
3452 8 : ereport(elevel,
3453 : (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
3454 : errmsg("parameter \"%s\" cannot be set after connection start",
3455 : record->name)));
3456 0 : return 0;
3457 : }
3458 246 : break;
3459 42404 : case PGC_SUSET:
3460 42404 : if (context == PGC_USERSET || context == PGC_BACKEND)
3461 : {
3462 : /*
3463 : * Check whether the requesting user has been granted
3464 : * privilege to set this GUC.
3465 : */
3466 : AclResult aclresult;
3467 :
3468 30 : aclresult = pg_parameter_aclcheck(record->name, srole, ACL_SET);
3469 30 : if (aclresult != ACLCHECK_OK)
3470 : {
3471 : /* No granted privilege */
3472 16 : ereport(elevel,
3473 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
3474 : errmsg("permission denied to set parameter \"%s\"",
3475 : record->name)));
3476 4 : return 0;
3477 : }
3478 : }
3479 42388 : break;
3480 752032 : case PGC_USERSET:
3481 : /* always okay */
3482 752032 : break;
3483 : }
3484 :
3485 : /*
3486 : * Disallow changing GUC_NOT_WHILE_SEC_REST values if we are inside a
3487 : * security restriction context. We can reject this regardless of the GUC
3488 : * context or source, mainly because sources that it might be reasonable
3489 : * to override for won't be seen while inside a function.
3490 : *
3491 : * Note: variables marked GUC_NOT_WHILE_SEC_REST should usually be marked
3492 : * GUC_NO_RESET_ALL as well, because ResetAllOptions() doesn't check this.
3493 : * An exception might be made if the reset value is assumed to be "safe".
3494 : *
3495 : * Note: this flag is currently used for "session_authorization" and
3496 : * "role". We need to prohibit changing these inside a local userid
3497 : * context because when we exit it, GUC won't be notified, leaving things
3498 : * out of sync. (This could be fixed by forcing a new GUC nesting level,
3499 : * but that would change behavior in possibly-undesirable ways.) Also, we
3500 : * prohibit changing these in a security-restricted operation because
3501 : * otherwise RESET could be used to regain the session user's privileges.
3502 : */
3503 1042014 : if (record->flags & GUC_NOT_WHILE_SEC_REST)
3504 : {
3505 69820 : if (InLocalUserIdChange())
3506 : {
3507 : /*
3508 : * Phrasing of this error message is historical, but it's the most
3509 : * common case.
3510 : */
3511 0 : ereport(elevel,
3512 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
3513 : errmsg("cannot set parameter \"%s\" within security-definer function",
3514 : record->name)));
3515 0 : return 0;
3516 : }
3517 69820 : if (InSecurityRestrictedOperation())
3518 : {
3519 0 : ereport(elevel,
3520 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
3521 : errmsg("cannot set parameter \"%s\" within security-restricted operation",
3522 : record->name)));
3523 0 : return 0;
3524 : }
3525 : }
3526 :
3527 : /* Disallow resetting and saving GUC_NO_RESET values */
3528 1042014 : if (record->flags & GUC_NO_RESET)
3529 : {
3530 24058 : if (value == NULL)
3531 : {
3532 18 : ereport(elevel,
3533 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3534 : errmsg("parameter \"%s\" cannot be reset", record->name)));
3535 0 : return 0;
3536 : }
3537 24040 : if (action == GUC_ACTION_SAVE)
3538 : {
3539 6 : ereport(elevel,
3540 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3541 : errmsg("parameter \"%s\" cannot be set locally in functions",
3542 : record->name)));
3543 0 : return 0;
3544 : }
3545 : }
3546 :
3547 : /*
3548 : * Should we set reset/stacked values? (If so, the behavior is not
3549 : * transactional.) This is done either when we get a default value from
3550 : * the database's/user's/client's default settings or when we reset a
3551 : * value to its default.
3552 : */
3553 1041994 : makeDefault = changeVal && (source <= PGC_S_OVERRIDE) &&
3554 4 : ((value != NULL) || source == PGC_S_DEFAULT);
3555 :
3556 : /*
3557 : * Ignore attempted set if overridden by previously processed setting.
3558 : * However, if changeVal is false then plow ahead anyway since we are
3559 : * trying to find out if the value is potentially good, not actually use
3560 : * it. Also keep going if makeDefault is true, since we may want to set
3561 : * the reset/stacked values even if we can't set the variable itself.
3562 : */
3563 1041990 : if (record->source > source)
3564 : {
3565 2228 : if (changeVal && !makeDefault)
3566 : {
3567 0 : elog(DEBUG3, "\"%s\": setting ignored because previous source is higher priority",
3568 : record->name);
3569 0 : return -1;
3570 : }
3571 2228 : changeVal = false;
3572 : }
3573 :
3574 : /*
3575 : * Evaluate value and set variable.
3576 : */
3577 1041990 : switch (record->vartype)
3578 : {
3579 160530 : case PGC_BOOL:
3580 : {
3581 160530 : struct config_bool *conf = &record->_bool;
3582 :
3583 : #define newval (newval_union.boolval)
3584 :
3585 160530 : if (value)
3586 : {
3587 158998 : if (!parse_and_validate_value(record, value,
3588 : source, elevel,
3589 : &newval_union, &newextra))
3590 0 : return 0;
3591 : }
3592 1532 : else if (source == PGC_S_DEFAULT)
3593 : {
3594 0 : newval = conf->boot_val;
3595 0 : if (!call_bool_check_hook(record, &newval, &newextra,
3596 : source, elevel))
3597 0 : return 0;
3598 : }
3599 : else
3600 : {
3601 1532 : newval = conf->reset_val;
3602 1532 : newextra = record->reset_extra;
3603 1532 : source = record->reset_source;
3604 1532 : context = record->reset_scontext;
3605 1532 : srole = record->reset_srole;
3606 : }
3607 :
3608 160506 : if (prohibitValueChange)
3609 : {
3610 : /* Release newextra, unless it's reset_extra */
3611 1578 : if (newextra && !extra_field_used(record, newextra))
3612 0 : guc_free(newextra);
3613 :
3614 1578 : if (*conf->variable != newval)
3615 : {
3616 0 : record->status |= GUC_PENDING_RESTART;
3617 0 : ereport(elevel,
3618 : (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
3619 : errmsg("parameter \"%s\" cannot be changed without restarting the server",
3620 : record->name)));
3621 0 : return 0;
3622 : }
3623 1578 : record->status &= ~GUC_PENDING_RESTART;
3624 1578 : return -1;
3625 : }
3626 :
3627 158928 : if (changeVal)
3628 : {
3629 : /* Save old value to support transaction abort */
3630 158800 : if (!makeDefault)
3631 29078 : push_old_value(record, action);
3632 :
3633 158800 : if (conf->assign_hook)
3634 0 : conf->assign_hook(newval, newextra);
3635 158800 : *conf->variable = newval;
3636 158800 : set_extra_field(record, &record->extra,
3637 : newextra);
3638 158800 : set_guc_source(record, source);
3639 158800 : record->scontext = context;
3640 158800 : record->srole = srole;
3641 : }
3642 158928 : if (makeDefault)
3643 : {
3644 129824 : if (record->reset_source <= source)
3645 : {
3646 129722 : conf->reset_val = newval;
3647 129722 : set_extra_field(record, &record->reset_extra,
3648 : newextra);
3649 129722 : record->reset_source = source;
3650 129722 : record->reset_scontext = context;
3651 129722 : record->reset_srole = srole;
3652 : }
3653 129824 : for (GucStack *stack = record->stack; stack; stack = stack->prev)
3654 : {
3655 0 : if (stack->source <= source)
3656 : {
3657 0 : stack->prior.val.boolval = newval;
3658 0 : set_extra_field(record, &stack->prior.extra,
3659 : newextra);
3660 0 : stack->source = source;
3661 0 : stack->scontext = context;
3662 0 : stack->srole = srole;
3663 : }
3664 : }
3665 : }
3666 :
3667 : /* Perhaps we didn't install newextra anywhere */
3668 158928 : if (newextra && !extra_field_used(record, newextra))
3669 0 : guc_free(newextra);
3670 158928 : break;
3671 :
3672 : #undef newval
3673 : }
3674 :
3675 114346 : case PGC_INT:
3676 : {
3677 114346 : struct config_int *conf = &record->_int;
3678 :
3679 : #define newval (newval_union.intval)
3680 :
3681 114346 : if (value)
3682 : {
3683 113952 : if (!parse_and_validate_value(record, value,
3684 : source, elevel,
3685 : &newval_union, &newextra))
3686 0 : return 0;
3687 : }
3688 394 : else if (source == PGC_S_DEFAULT)
3689 : {
3690 0 : newval = conf->boot_val;
3691 0 : if (!call_int_check_hook(record, &newval, &newextra,
3692 : source, elevel))
3693 0 : return 0;
3694 : }
3695 : else
3696 : {
3697 394 : newval = conf->reset_val;
3698 394 : newextra = record->reset_extra;
3699 394 : source = record->reset_source;
3700 394 : context = record->reset_scontext;
3701 394 : srole = record->reset_srole;
3702 : }
3703 :
3704 114346 : if (prohibitValueChange)
3705 : {
3706 : /* Release newextra, unless it's reset_extra */
3707 8334 : if (newextra && !extra_field_used(record, newextra))
3708 0 : guc_free(newextra);
3709 :
3710 8334 : if (*conf->variable != newval)
3711 : {
3712 0 : record->status |= GUC_PENDING_RESTART;
3713 0 : ereport(elevel,
3714 : (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
3715 : errmsg("parameter \"%s\" cannot be changed without restarting the server",
3716 : record->name)));
3717 0 : return 0;
3718 : }
3719 8334 : record->status &= ~GUC_PENDING_RESTART;
3720 8334 : return -1;
3721 : }
3722 :
3723 106012 : if (changeVal)
3724 : {
3725 : /* Save old value to support transaction abort */
3726 104380 : if (!makeDefault)
3727 22024 : push_old_value(record, action);
3728 :
3729 104380 : if (conf->assign_hook)
3730 18302 : conf->assign_hook(newval, newextra);
3731 104380 : *conf->variable = newval;
3732 104380 : set_extra_field(record, &record->extra,
3733 : newextra);
3734 104380 : set_guc_source(record, source);
3735 104380 : record->scontext = context;
3736 104380 : record->srole = srole;
3737 : }
3738 106012 : if (makeDefault)
3739 : {
3740 83904 : if (record->reset_source <= source)
3741 : {
3742 82356 : conf->reset_val = newval;
3743 82356 : set_extra_field(record, &record->reset_extra,
3744 : newextra);
3745 82356 : record->reset_source = source;
3746 82356 : record->reset_scontext = context;
3747 82356 : record->reset_srole = srole;
3748 : }
3749 83904 : for (GucStack *stack = record->stack; stack; stack = stack->prev)
3750 : {
3751 0 : if (stack->source <= source)
3752 : {
3753 0 : stack->prior.val.intval = newval;
3754 0 : set_extra_field(record, &stack->prior.extra,
3755 : newextra);
3756 0 : stack->source = source;
3757 0 : stack->scontext = context;
3758 0 : stack->srole = srole;
3759 : }
3760 : }
3761 : }
3762 :
3763 : /* Perhaps we didn't install newextra anywhere */
3764 106012 : if (newextra && !extra_field_used(record, newextra))
3765 0 : guc_free(newextra);
3766 106012 : break;
3767 :
3768 : #undef newval
3769 : }
3770 :
3771 8692 : case PGC_REAL:
3772 : {
3773 8692 : struct config_real *conf = &record->_real;
3774 :
3775 : #define newval (newval_union.realval)
3776 :
3777 8692 : if (value)
3778 : {
3779 8504 : if (!parse_and_validate_value(record, value,
3780 : source, elevel,
3781 : &newval_union, &newextra))
3782 0 : return 0;
3783 : }
3784 188 : else if (source == PGC_S_DEFAULT)
3785 : {
3786 0 : newval = conf->boot_val;
3787 0 : if (!call_real_check_hook(record, &newval, &newextra,
3788 : source, elevel))
3789 0 : return 0;
3790 : }
3791 : else
3792 : {
3793 188 : newval = conf->reset_val;
3794 188 : newextra = record->reset_extra;
3795 188 : source = record->reset_source;
3796 188 : context = record->reset_scontext;
3797 188 : srole = record->reset_srole;
3798 : }
3799 :
3800 8680 : if (prohibitValueChange)
3801 : {
3802 : /* Release newextra, unless it's reset_extra */
3803 0 : if (newextra && !extra_field_used(record, newextra))
3804 0 : guc_free(newextra);
3805 :
3806 0 : if (*conf->variable != newval)
3807 : {
3808 0 : record->status |= GUC_PENDING_RESTART;
3809 0 : ereport(elevel,
3810 : (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
3811 : errmsg("parameter \"%s\" cannot be changed without restarting the server",
3812 : record->name)));
3813 0 : return 0;
3814 : }
3815 0 : record->status &= ~GUC_PENDING_RESTART;
3816 0 : return -1;
3817 : }
3818 :
3819 8680 : if (changeVal)
3820 : {
3821 : /* Save old value to support transaction abort */
3822 8680 : if (!makeDefault)
3823 8680 : push_old_value(record, action);
3824 :
3825 8680 : if (conf->assign_hook)
3826 0 : conf->assign_hook(newval, newextra);
3827 8680 : *conf->variable = newval;
3828 8680 : set_extra_field(record, &record->extra,
3829 : newextra);
3830 8680 : set_guc_source(record, source);
3831 8680 : record->scontext = context;
3832 8680 : record->srole = srole;
3833 : }
3834 8680 : if (makeDefault)
3835 : {
3836 0 : if (record->reset_source <= source)
3837 : {
3838 0 : conf->reset_val = newval;
3839 0 : set_extra_field(record, &record->reset_extra,
3840 : newextra);
3841 0 : record->reset_source = source;
3842 0 : record->reset_scontext = context;
3843 0 : record->reset_srole = srole;
3844 : }
3845 0 : for (GucStack *stack = record->stack; stack; stack = stack->prev)
3846 : {
3847 0 : if (stack->source <= source)
3848 : {
3849 0 : stack->prior.val.realval = newval;
3850 0 : set_extra_field(record, &stack->prior.extra,
3851 : newextra);
3852 0 : stack->source = source;
3853 0 : stack->scontext = context;
3854 0 : stack->srole = srole;
3855 : }
3856 : }
3857 : }
3858 :
3859 : /* Perhaps we didn't install newextra anywhere */
3860 8680 : if (newextra && !extra_field_used(record, newextra))
3861 0 : guc_free(newextra);
3862 8680 : break;
3863 :
3864 : #undef newval
3865 : }
3866 :
3867 682092 : case PGC_STRING:
3868 : {
3869 682092 : struct config_string *conf = &record->_string;
3870 682092 : GucContext orig_context = context;
3871 682092 : GucSource orig_source = source;
3872 682092 : Oid orig_srole = srole;
3873 :
3874 : #define newval (newval_union.stringval)
3875 :
3876 682092 : if (value)
3877 : {
3878 679014 : if (!parse_and_validate_value(record, value,
3879 : source, elevel,
3880 : &newval_union, &newextra))
3881 6 : return 0;
3882 : }
3883 3078 : else if (source == PGC_S_DEFAULT)
3884 : {
3885 : /* non-NULL boot_val must always get strdup'd */
3886 4 : if (conf->boot_val != NULL)
3887 : {
3888 4 : newval = guc_strdup(elevel, conf->boot_val);
3889 4 : if (newval == NULL)
3890 0 : return 0;
3891 : }
3892 : else
3893 0 : newval = NULL;
3894 :
3895 4 : if (!call_string_check_hook(record, &newval, &newextra,
3896 : source, elevel))
3897 : {
3898 0 : guc_free(newval);
3899 0 : return 0;
3900 : }
3901 : }
3902 : else
3903 : {
3904 : /*
3905 : * strdup not needed, since reset_val is already under
3906 : * guc.c's control
3907 : */
3908 3074 : newval = conf->reset_val;
3909 3074 : newextra = record->reset_extra;
3910 3074 : source = record->reset_source;
3911 3074 : context = record->reset_scontext;
3912 3074 : srole = record->reset_srole;
3913 : }
3914 :
3915 682044 : if (prohibitValueChange)
3916 : {
3917 : bool newval_different;
3918 :
3919 : /* newval shouldn't be NULL, so we're a bit sloppy here */
3920 8664 : newval_different = (*conf->variable == NULL ||
3921 5776 : newval == NULL ||
3922 2888 : strcmp(*conf->variable, newval) != 0);
3923 :
3924 : /* Release newval, unless it's reset_val */
3925 2888 : if (newval && !string_field_used(record, newval))
3926 2888 : guc_free(newval);
3927 : /* Release newextra, unless it's reset_extra */
3928 2888 : if (newextra && !extra_field_used(record, newextra))
3929 0 : guc_free(newextra);
3930 :
3931 2888 : if (newval_different)
3932 : {
3933 0 : record->status |= GUC_PENDING_RESTART;
3934 0 : ereport(elevel,
3935 : (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
3936 : errmsg("parameter \"%s\" cannot be changed without restarting the server",
3937 : record->name)));
3938 0 : return 0;
3939 : }
3940 2888 : record->status &= ~GUC_PENDING_RESTART;
3941 2888 : return -1;
3942 : }
3943 :
3944 679156 : if (changeVal)
3945 : {
3946 : /* Save old value to support transaction abort */
3947 677416 : if (!makeDefault)
3948 380698 : push_old_value(record, action);
3949 :
3950 677416 : if (conf->assign_hook)
3951 620206 : conf->assign_hook(newval, newextra);
3952 677414 : set_string_field(record, conf->variable, newval);
3953 677414 : set_extra_field(record, &record->extra,
3954 : newextra);
3955 677414 : set_guc_source(record, source);
3956 677414 : record->scontext = context;
3957 677414 : record->srole = srole;
3958 :
3959 : /*
3960 : * Ugly hack: during SET session_authorization, forcibly
3961 : * do SET ROLE NONE with the same context/source/etc, so
3962 : * that the effects will have identical lifespan. This is
3963 : * required by the SQL spec, and it's not possible to do
3964 : * it within the variable's check hook or assign hook
3965 : * because our APIs for those don't pass enough info.
3966 : * However, don't do it if is_reload: in that case we
3967 : * expect that if "role" isn't supposed to be default, it
3968 : * has been or will be set by a separate reload action.
3969 : *
3970 : * Also, for the call from InitializeSessionUserId with
3971 : * source == PGC_S_OVERRIDE, use PGC_S_DYNAMIC_DEFAULT for
3972 : * "role"'s source, so that it's still possible to set
3973 : * "role" from pg_db_role_setting entries. (See notes in
3974 : * InitializeSessionUserId before changing this.)
3975 : *
3976 : * A fine point: for RESET session_authorization, we do
3977 : * "RESET role" not "SET ROLE NONE" (by passing down NULL
3978 : * rather than "none" for the value). This would have the
3979 : * same effects in typical cases, but if the reset value
3980 : * of "role" is not "none" it seems better to revert to
3981 : * that.
3982 : */
3983 677414 : if (!is_reload &&
3984 635796 : strcmp(record->name, "session_authorization") == 0)
3985 31180 : (void) set_config_with_handle("role", NULL,
3986 : value ? "none" : NULL,
3987 : orig_context,
3988 : (orig_source == PGC_S_OVERRIDE)
3989 : ? PGC_S_DYNAMIC_DEFAULT
3990 : : orig_source,
3991 : orig_srole,
3992 : action,
3993 : true,
3994 : elevel,
3995 : false);
3996 : }
3997 :
3998 679154 : if (makeDefault)
3999 : {
4000 297218 : if (record->reset_source <= source)
4001 : {
4002 296716 : set_string_field(record, &conf->reset_val, newval);
4003 296716 : set_extra_field(record, &record->reset_extra,
4004 : newextra);
4005 296716 : record->reset_source = source;
4006 296716 : record->reset_scontext = context;
4007 296716 : record->reset_srole = srole;
4008 : }
4009 297218 : for (GucStack *stack = record->stack; stack; stack = stack->prev)
4010 : {
4011 0 : if (stack->source <= source)
4012 : {
4013 0 : set_string_field(record, &stack->prior.val.stringval,
4014 : newval);
4015 0 : set_extra_field(record, &stack->prior.extra,
4016 : newextra);
4017 0 : stack->source = source;
4018 0 : stack->scontext = context;
4019 0 : stack->srole = srole;
4020 : }
4021 : }
4022 : }
4023 :
4024 : /* Perhaps we didn't install newval anywhere */
4025 679154 : if (newval && !string_field_used(record, newval))
4026 1712 : guc_free(newval);
4027 : /* Perhaps we didn't install newextra anywhere */
4028 679154 : if (newextra && !extra_field_used(record, newextra))
4029 520 : guc_free(newextra);
4030 679154 : break;
4031 :
4032 : #undef newval
4033 : }
4034 :
4035 76330 : case PGC_ENUM:
4036 : {
4037 76330 : struct config_enum *conf = &record->_enum;
4038 :
4039 : #define newval (newval_union.enumval)
4040 :
4041 76330 : if (value)
4042 : {
4043 75782 : if (!parse_and_validate_value(record, value,
4044 : source, elevel,
4045 : &newval_union, &newextra))
4046 0 : return 0;
4047 : }
4048 548 : else if (source == PGC_S_DEFAULT)
4049 : {
4050 0 : newval = conf->boot_val;
4051 0 : if (!call_enum_check_hook(record, &newval, &newextra,
4052 : source, elevel))
4053 0 : return 0;
4054 : }
4055 : else
4056 : {
4057 548 : newval = conf->reset_val;
4058 548 : newextra = record->reset_extra;
4059 548 : source = record->reset_source;
4060 548 : context = record->reset_scontext;
4061 548 : srole = record->reset_srole;
4062 : }
4063 :
4064 76290 : if (prohibitValueChange)
4065 : {
4066 : /* Release newextra, unless it's reset_extra */
4067 3252 : if (newextra && !extra_field_used(record, newextra))
4068 0 : guc_free(newextra);
4069 :
4070 3252 : if (*conf->variable != newval)
4071 : {
4072 0 : record->status |= GUC_PENDING_RESTART;
4073 0 : ereport(elevel,
4074 : (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
4075 : errmsg("parameter \"%s\" cannot be changed without restarting the server",
4076 : record->name)));
4077 0 : return 0;
4078 : }
4079 3252 : record->status &= ~GUC_PENDING_RESTART;
4080 3252 : return -1;
4081 : }
4082 :
4083 73038 : if (changeVal)
4084 : {
4085 : /* Save old value to support transaction abort */
4086 72814 : if (!makeDefault)
4087 20560 : push_old_value(record, action);
4088 :
4089 72814 : if (conf->assign_hook)
4090 11242 : conf->assign_hook(newval, newextra);
4091 72814 : *conf->variable = newval;
4092 72814 : set_extra_field(record, &record->extra,
4093 : newextra);
4094 72814 : set_guc_source(record, source);
4095 72814 : record->scontext = context;
4096 72814 : record->srole = srole;
4097 : }
4098 73038 : if (makeDefault)
4099 : {
4100 52254 : if (record->reset_source <= source)
4101 : {
4102 52254 : conf->reset_val = newval;
4103 52254 : set_extra_field(record, &record->reset_extra,
4104 : newextra);
4105 52254 : record->reset_source = source;
4106 52254 : record->reset_scontext = context;
4107 52254 : record->reset_srole = srole;
4108 : }
4109 52254 : for (GucStack *stack = record->stack; stack; stack = stack->prev)
4110 : {
4111 0 : if (stack->source <= source)
4112 : {
4113 0 : stack->prior.val.enumval = newval;
4114 0 : set_extra_field(record, &stack->prior.extra,
4115 : newextra);
4116 0 : stack->source = source;
4117 0 : stack->scontext = context;
4118 0 : stack->srole = srole;
4119 : }
4120 : }
4121 : }
4122 :
4123 : /* Perhaps we didn't install newextra anywhere */
4124 73038 : if (newextra && !extra_field_used(record, newextra))
4125 0 : guc_free(newextra);
4126 73038 : break;
4127 :
4128 : #undef newval
4129 : }
4130 : }
4131 :
4132 1025812 : if (changeVal && (record->flags & GUC_REPORT) &&
4133 642850 : !(record->status & GUC_NEEDS_REPORT))
4134 : {
4135 257036 : record->status |= GUC_NEEDS_REPORT;
4136 257036 : slist_push_head(&guc_report_list, &record->report_link);
4137 : }
4138 :
4139 1025812 : return changeVal ? 1 : -1;
4140 : }
4141 :
4142 :
4143 : /*
4144 : * Retrieve a config_handle for the given name, suitable for calling
4145 : * set_config_with_handle(). Only return handle to permanent GUC.
4146 : */
4147 : config_handle *
4148 132 : get_config_handle(const char *name)
4149 : {
4150 132 : struct config_generic *gen = find_option(name, false, false, 0);
4151 :
4152 132 : if (gen && ((gen->flags & GUC_CUSTOM_PLACEHOLDER) == 0))
4153 132 : return gen;
4154 :
4155 0 : return NULL;
4156 : }
4157 :
4158 :
4159 : /*
4160 : * Set the fields for source file and line number the setting came from.
4161 : */
4162 : static void
4163 147542 : set_config_sourcefile(const char *name, char *sourcefile, int sourceline)
4164 : {
4165 : struct config_generic *record;
4166 : int elevel;
4167 :
4168 : /*
4169 : * To avoid cluttering the log, only the postmaster bleats loudly about
4170 : * problems with the config file.
4171 : */
4172 147542 : elevel = IsUnderPostmaster ? DEBUG3 : LOG;
4173 :
4174 147542 : record = find_option(name, true, false, elevel);
4175 : /* should not happen */
4176 147542 : if (record == NULL)
4177 0 : return;
4178 :
4179 147542 : sourcefile = guc_strdup(elevel, sourcefile);
4180 147542 : guc_free(record->sourcefile);
4181 147542 : record->sourcefile = sourcefile;
4182 147542 : record->sourceline = sourceline;
4183 : }
4184 :
4185 : /*
4186 : * Set a config option to the given value.
4187 : *
4188 : * See also set_config_option; this is just the wrapper to be called from
4189 : * outside GUC. (This function should be used when possible, because its API
4190 : * is more stable than set_config_option's.)
4191 : *
4192 : * Note: there is no support here for setting source file/line, as it
4193 : * is currently not needed.
4194 : */
4195 : void
4196 329334 : SetConfigOption(const char *name, const char *value,
4197 : GucContext context, GucSource source)
4198 : {
4199 329334 : (void) set_config_option(name, value, context, source,
4200 : GUC_ACTION_SET, true, 0, false);
4201 329284 : }
4202 :
4203 :
4204 :
4205 : /*
4206 : * Fetch the current value of the option `name', as a string.
4207 : *
4208 : * If the option doesn't exist, return NULL if missing_ok is true,
4209 : * otherwise throw an ereport and don't return.
4210 : *
4211 : * If restrict_privileged is true, we also enforce that only superusers and
4212 : * members of the pg_read_all_settings role can see GUC_SUPERUSER_ONLY
4213 : * variables. This should only be passed as true in user-driven calls.
4214 : *
4215 : * The string is *not* allocated for modification and is really only
4216 : * valid until the next call to configuration related functions.
4217 : */
4218 : const char *
4219 13740 : GetConfigOption(const char *name, bool missing_ok, bool restrict_privileged)
4220 : {
4221 : struct config_generic *record;
4222 : static char buffer[256];
4223 :
4224 13740 : record = find_option(name, false, missing_ok, ERROR);
4225 13740 : if (record == NULL)
4226 2 : return NULL;
4227 13738 : if (restrict_privileged &&
4228 0 : !ConfigOptionIsVisible(record))
4229 0 : ereport(ERROR,
4230 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
4231 : errmsg("permission denied to examine \"%s\"", name),
4232 : errdetail("Only roles with privileges of the \"%s\" role may examine this parameter.",
4233 : "pg_read_all_settings")));
4234 :
4235 13738 : switch (record->vartype)
4236 : {
4237 2320 : case PGC_BOOL:
4238 2320 : return *record->_bool.variable ? "on" : "off";
4239 :
4240 3502 : case PGC_INT:
4241 3502 : snprintf(buffer, sizeof(buffer), "%d",
4242 3502 : *record->_int.variable);
4243 3502 : return buffer;
4244 :
4245 0 : case PGC_REAL:
4246 0 : snprintf(buffer, sizeof(buffer), "%g",
4247 0 : *record->_real.variable);
4248 0 : return buffer;
4249 :
4250 6394 : case PGC_STRING:
4251 6394 : return *record->_string.variable ?
4252 6394 : *record->_string.variable : "";
4253 :
4254 1522 : case PGC_ENUM:
4255 1522 : return config_enum_lookup_by_value(record,
4256 1522 : *record->_enum.variable);
4257 : }
4258 0 : return NULL;
4259 : }
4260 :
4261 : /*
4262 : * Get the RESET value associated with the given option.
4263 : *
4264 : * Note: this is not re-entrant, due to use of static result buffer;
4265 : * not to mention that a string variable could have its reset_val changed.
4266 : * Beware of assuming the result value is good for very long.
4267 : */
4268 : const char *
4269 0 : GetConfigOptionResetString(const char *name)
4270 : {
4271 : struct config_generic *record;
4272 : static char buffer[256];
4273 :
4274 0 : record = find_option(name, false, false, ERROR);
4275 : Assert(record != NULL);
4276 0 : if (!ConfigOptionIsVisible(record))
4277 0 : ereport(ERROR,
4278 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
4279 : errmsg("permission denied to examine \"%s\"", name),
4280 : errdetail("Only roles with privileges of the \"%s\" role may examine this parameter.",
4281 : "pg_read_all_settings")));
4282 :
4283 0 : switch (record->vartype)
4284 : {
4285 0 : case PGC_BOOL:
4286 0 : return record->_bool.reset_val ? "on" : "off";
4287 :
4288 0 : case PGC_INT:
4289 0 : snprintf(buffer, sizeof(buffer), "%d",
4290 : record->_int.reset_val);
4291 0 : return buffer;
4292 :
4293 0 : case PGC_REAL:
4294 0 : snprintf(buffer, sizeof(buffer), "%g",
4295 : record->_real.reset_val);
4296 0 : return buffer;
4297 :
4298 0 : case PGC_STRING:
4299 0 : return record->_string.reset_val ?
4300 0 : record->_string.reset_val : "";
4301 :
4302 0 : case PGC_ENUM:
4303 0 : return config_enum_lookup_by_value(record,
4304 : record->_enum.reset_val);
4305 : }
4306 0 : return NULL;
4307 : }
4308 :
4309 : /*
4310 : * Get the GUC flags associated with the given option.
4311 : *
4312 : * If the option doesn't exist, return 0 if missing_ok is true,
4313 : * otherwise throw an ereport and don't return.
4314 : */
4315 : int
4316 40 : GetConfigOptionFlags(const char *name, bool missing_ok)
4317 : {
4318 : struct config_generic *record;
4319 :
4320 40 : record = find_option(name, false, missing_ok, ERROR);
4321 40 : if (record == NULL)
4322 0 : return 0;
4323 40 : return record->flags;
4324 : }
4325 :
4326 :
4327 : /*
4328 : * Write updated configuration parameter values into a temporary file.
4329 : * This function traverses the list of parameters and quotes the string
4330 : * values before writing them.
4331 : */
4332 : static void
4333 154 : write_auto_conf_file(int fd, const char *filename, ConfigVariable *head)
4334 : {
4335 : StringInfoData buf;
4336 :
4337 154 : initStringInfo(&buf);
4338 :
4339 : /* Emit file header containing warning comment */
4340 154 : appendStringInfoString(&buf, "# Do not edit this file manually!\n");
4341 154 : appendStringInfoString(&buf, "# It will be overwritten by the ALTER SYSTEM command.\n");
4342 :
4343 154 : errno = 0;
4344 154 : if (write(fd, buf.data, buf.len) != buf.len)
4345 : {
4346 : /* if write didn't set errno, assume problem is no disk space */
4347 0 : if (errno == 0)
4348 0 : errno = ENOSPC;
4349 0 : ereport(ERROR,
4350 : (errcode_for_file_access(),
4351 : errmsg("could not write to file \"%s\": %m", filename)));
4352 : }
4353 :
4354 : /* Emit each parameter, properly quoting the value */
4355 334 : for (ConfigVariable *item = head; item != NULL; item = item->next)
4356 : {
4357 : char *escaped;
4358 :
4359 180 : resetStringInfo(&buf);
4360 :
4361 180 : appendStringInfoString(&buf, item->name);
4362 180 : appendStringInfoString(&buf, " = '");
4363 :
4364 180 : escaped = escape_single_quotes_ascii(item->value);
4365 180 : if (!escaped)
4366 0 : ereport(ERROR,
4367 : (errcode(ERRCODE_OUT_OF_MEMORY),
4368 : errmsg("out of memory")));
4369 180 : appendStringInfoString(&buf, escaped);
4370 180 : free(escaped);
4371 :
4372 180 : appendStringInfoString(&buf, "'\n");
4373 :
4374 180 : errno = 0;
4375 180 : if (write(fd, buf.data, buf.len) != buf.len)
4376 : {
4377 : /* if write didn't set errno, assume problem is no disk space */
4378 0 : if (errno == 0)
4379 0 : errno = ENOSPC;
4380 0 : ereport(ERROR,
4381 : (errcode_for_file_access(),
4382 : errmsg("could not write to file \"%s\": %m", filename)));
4383 : }
4384 : }
4385 :
4386 : /* fsync before considering the write to be successful */
4387 154 : if (pg_fsync(fd) != 0)
4388 0 : ereport(ERROR,
4389 : (errcode_for_file_access(),
4390 : errmsg("could not fsync file \"%s\": %m", filename)));
4391 :
4392 154 : pfree(buf.data);
4393 154 : }
4394 :
4395 : /*
4396 : * Update the given list of configuration parameters, adding, replacing
4397 : * or deleting the entry for item "name" (delete if "value" == NULL).
4398 : */
4399 : static void
4400 154 : replace_auto_config_value(ConfigVariable **head_p, ConfigVariable **tail_p,
4401 : const char *name, const char *value)
4402 : {
4403 : ConfigVariable *newitem,
4404 : *next,
4405 154 : *prev = NULL;
4406 :
4407 : /*
4408 : * Remove any existing match(es) for "name". Normally there'd be at most
4409 : * one, but if external tools have modified the config file, there could
4410 : * be more.
4411 : */
4412 300 : for (ConfigVariable *item = *head_p; item != NULL; item = next)
4413 : {
4414 146 : next = item->next;
4415 146 : if (guc_name_compare(item->name, name) == 0)
4416 : {
4417 : /* found a match, delete it */
4418 76 : if (prev)
4419 12 : prev->next = next;
4420 : else
4421 64 : *head_p = next;
4422 76 : if (next == NULL)
4423 70 : *tail_p = prev;
4424 :
4425 76 : pfree(item->name);
4426 76 : pfree(item->value);
4427 76 : pfree(item->filename);
4428 76 : pfree(item);
4429 : }
4430 : else
4431 70 : prev = item;
4432 : }
4433 :
4434 : /* Done if we're trying to delete it */
4435 154 : if (value == NULL)
4436 44 : return;
4437 :
4438 : /* OK, append a new entry */
4439 110 : newitem = palloc_object(ConfigVariable);
4440 110 : newitem->name = pstrdup(name);
4441 110 : newitem->value = pstrdup(value);
4442 110 : newitem->errmsg = NULL;
4443 110 : newitem->filename = pstrdup(""); /* new item has no location */
4444 110 : newitem->sourceline = 0;
4445 110 : newitem->ignore = false;
4446 110 : newitem->applied = false;
4447 110 : newitem->next = NULL;
4448 :
4449 110 : if (*head_p == NULL)
4450 82 : *head_p = newitem;
4451 : else
4452 28 : (*tail_p)->next = newitem;
4453 110 : *tail_p = newitem;
4454 : }
4455 :
4456 :
4457 : /*
4458 : * Execute ALTER SYSTEM statement.
4459 : *
4460 : * Read the old PG_AUTOCONF_FILENAME file, merge in the new variable value,
4461 : * and write out an updated file. If the command is ALTER SYSTEM RESET ALL,
4462 : * we can skip reading the old file and just write an empty file.
4463 : *
4464 : * An LWLock is used to serialize updates of the configuration file.
4465 : *
4466 : * In case of an error, we leave the original automatic
4467 : * configuration file (PG_AUTOCONF_FILENAME) intact.
4468 : */
4469 : void
4470 202 : AlterSystemSetConfigFile(AlterSystemStmt *altersysstmt)
4471 : {
4472 : char *name;
4473 : char *value;
4474 202 : bool resetall = false;
4475 202 : ConfigVariable *head = NULL;
4476 202 : ConfigVariable *tail = NULL;
4477 : volatile int Tmpfd;
4478 : char AutoConfFileName[MAXPGPATH];
4479 : char AutoConfTmpFileName[MAXPGPATH];
4480 :
4481 : /*
4482 : * Extract statement arguments
4483 : */
4484 202 : name = altersysstmt->setstmt->name;
4485 :
4486 202 : if (!AllowAlterSystem)
4487 0 : ereport(ERROR,
4488 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
4489 : errmsg("ALTER SYSTEM is not allowed in this environment")));
4490 :
4491 202 : switch (altersysstmt->setstmt->kind)
4492 : {
4493 144 : case VAR_SET_VALUE:
4494 144 : value = ExtractSetVariableArgs(altersysstmt->setstmt);
4495 144 : break;
4496 :
4497 56 : case VAR_SET_DEFAULT:
4498 : case VAR_RESET:
4499 56 : value = NULL;
4500 56 : break;
4501 :
4502 2 : case VAR_RESET_ALL:
4503 2 : value = NULL;
4504 2 : resetall = true;
4505 2 : break;
4506 :
4507 0 : default:
4508 0 : elog(ERROR, "unrecognized alter system stmt type: %d",
4509 : altersysstmt->setstmt->kind);
4510 : break;
4511 : }
4512 :
4513 : /*
4514 : * Check permission to run ALTER SYSTEM on the target variable
4515 : */
4516 202 : if (!superuser())
4517 : {
4518 46 : if (resetall)
4519 2 : ereport(ERROR,
4520 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
4521 : errmsg("permission denied to perform ALTER SYSTEM RESET ALL")));
4522 : else
4523 : {
4524 : AclResult aclresult;
4525 :
4526 44 : aclresult = pg_parameter_aclcheck(name, GetUserId(),
4527 : ACL_ALTER_SYSTEM);
4528 44 : if (aclresult != ACLCHECK_OK)
4529 26 : ereport(ERROR,
4530 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
4531 : errmsg("permission denied to set parameter \"%s\"",
4532 : name)));
4533 : }
4534 : }
4535 :
4536 : /*
4537 : * Unless it's RESET_ALL, validate the target variable and value
4538 : */
4539 174 : if (!resetall)
4540 : {
4541 : struct config_generic *record;
4542 :
4543 : /* We don't want to create a placeholder if there's not one already */
4544 174 : record = find_option(name, false, true, DEBUG5);
4545 174 : if (record != NULL)
4546 : {
4547 : /*
4548 : * Don't allow parameters that can't be set in configuration files
4549 : * to be set in PG_AUTOCONF_FILENAME file.
4550 : */
4551 170 : if ((record->context == PGC_INTERNAL) ||
4552 166 : (record->flags & GUC_DISALLOW_IN_FILE) ||
4553 158 : (record->flags & GUC_DISALLOW_IN_AUTO_FILE))
4554 12 : ereport(ERROR,
4555 : (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
4556 : errmsg("parameter \"%s\" cannot be changed",
4557 : name)));
4558 :
4559 : /*
4560 : * If a value is specified, verify that it's sane.
4561 : */
4562 158 : if (value)
4563 : {
4564 : union config_var_val newval;
4565 116 : void *newextra = NULL;
4566 :
4567 116 : if (!parse_and_validate_value(record, value,
4568 : PGC_S_FILE, ERROR,
4569 : &newval, &newextra))
4570 0 : ereport(ERROR,
4571 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
4572 : errmsg("invalid value for parameter \"%s\": \"%s\"",
4573 : name, value)));
4574 :
4575 108 : if (record->vartype == PGC_STRING && newval.stringval != NULL)
4576 46 : guc_free(newval.stringval);
4577 108 : guc_free(newextra);
4578 : }
4579 : }
4580 : else
4581 : {
4582 : /*
4583 : * Variable not known; check we'd be allowed to create it. (We
4584 : * cannot validate the value, but that's fine. A non-core GUC in
4585 : * the config file cannot cause postmaster start to fail, so we
4586 : * don't have to be too tense about possibly installing a bad
4587 : * value.)
4588 : *
4589 : * As an exception, we skip this check if this is a RESET command
4590 : * for an unknown custom GUC, else there'd be no way for users to
4591 : * remove such settings with reserved prefixes.
4592 : */
4593 4 : if (value || !valid_custom_variable_name(name))
4594 2 : (void) assignable_custom_variable_name(name, false, ERROR);
4595 : }
4596 :
4597 : /*
4598 : * We must also reject values containing newlines, because the grammar
4599 : * for config files doesn't support embedded newlines in string
4600 : * literals.
4601 : */
4602 154 : if (value && strchr(value, '\n'))
4603 0 : ereport(ERROR,
4604 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
4605 : errmsg("parameter value for ALTER SYSTEM must not contain a newline")));
4606 : }
4607 :
4608 : /*
4609 : * PG_AUTOCONF_FILENAME and its corresponding temporary file are always in
4610 : * the data directory, so we can reference them by simple relative paths.
4611 : */
4612 154 : snprintf(AutoConfFileName, sizeof(AutoConfFileName), "%s",
4613 : PG_AUTOCONF_FILENAME);
4614 154 : snprintf(AutoConfTmpFileName, sizeof(AutoConfTmpFileName), "%s.%s",
4615 : AutoConfFileName,
4616 : "tmp");
4617 :
4618 : /*
4619 : * Only one backend is allowed to operate on PG_AUTOCONF_FILENAME at a
4620 : * time. Use AutoFileLock to ensure that. We must hold the lock while
4621 : * reading the old file contents.
4622 : */
4623 154 : LWLockAcquire(AutoFileLock, LW_EXCLUSIVE);
4624 :
4625 : /*
4626 : * If we're going to reset everything, then no need to open or parse the
4627 : * old file. We'll just write out an empty list.
4628 : */
4629 154 : if (!resetall)
4630 : {
4631 : struct stat st;
4632 :
4633 154 : if (stat(AutoConfFileName, &st) == 0)
4634 : {
4635 : /* open old file PG_AUTOCONF_FILENAME */
4636 : FILE *infile;
4637 :
4638 154 : infile = AllocateFile(AutoConfFileName, "r");
4639 154 : if (infile == NULL)
4640 0 : ereport(ERROR,
4641 : (errcode_for_file_access(),
4642 : errmsg("could not open file \"%s\": %m",
4643 : AutoConfFileName)));
4644 :
4645 : /* parse it */
4646 154 : if (!ParseConfigFp(infile, AutoConfFileName, CONF_FILE_START_DEPTH,
4647 : LOG, &head, &tail))
4648 0 : ereport(ERROR,
4649 : (errcode(ERRCODE_CONFIG_FILE_ERROR),
4650 : errmsg("could not parse contents of file \"%s\"",
4651 : AutoConfFileName)));
4652 :
4653 154 : FreeFile(infile);
4654 : }
4655 :
4656 : /*
4657 : * Now, replace any existing entry with the new value, or add it if
4658 : * not present.
4659 : */
4660 154 : replace_auto_config_value(&head, &tail, name, value);
4661 : }
4662 :
4663 : /*
4664 : * Invoke the post-alter hook for setting this GUC variable. GUCs
4665 : * typically do not have corresponding entries in pg_parameter_acl, so we
4666 : * call the hook using the name rather than a potentially-non-existent
4667 : * OID. Nonetheless, we pass ParameterAclRelationId so that this call
4668 : * context can be distinguished from others. (Note that "name" will be
4669 : * NULL in the RESET ALL case.)
4670 : *
4671 : * We do this here rather than at the end, because ALTER SYSTEM is not
4672 : * transactional. If the hook aborts our transaction, it will be cleaner
4673 : * to do so before we touch any files.
4674 : */
4675 154 : InvokeObjectPostAlterHookArgStr(ParameterAclRelationId, name,
4676 : ACL_ALTER_SYSTEM,
4677 : altersysstmt->setstmt->kind,
4678 : false);
4679 :
4680 : /*
4681 : * To ensure crash safety, first write the new file data to a temp file,
4682 : * then atomically rename it into place.
4683 : *
4684 : * If there is a temp file left over due to a previous crash, it's okay to
4685 : * truncate and reuse it.
4686 : */
4687 154 : Tmpfd = BasicOpenFile(AutoConfTmpFileName,
4688 : O_CREAT | O_RDWR | O_TRUNC);
4689 154 : if (Tmpfd < 0)
4690 0 : ereport(ERROR,
4691 : (errcode_for_file_access(),
4692 : errmsg("could not open file \"%s\": %m",
4693 : AutoConfTmpFileName)));
4694 :
4695 : /*
4696 : * Use a TRY block to clean up the file if we fail. Since we need a TRY
4697 : * block anyway, OK to use BasicOpenFile rather than OpenTransientFile.
4698 : */
4699 154 : PG_TRY();
4700 : {
4701 : /* Write and sync the new contents to the temporary file */
4702 154 : write_auto_conf_file(Tmpfd, AutoConfTmpFileName, head);
4703 :
4704 : /* Close before renaming; may be required on some platforms */
4705 154 : close(Tmpfd);
4706 154 : Tmpfd = -1;
4707 :
4708 : /*
4709 : * As the rename is atomic operation, if any problem occurs after this
4710 : * at worst it can lose the parameters set by last ALTER SYSTEM
4711 : * command.
4712 : */
4713 154 : durable_rename(AutoConfTmpFileName, AutoConfFileName, ERROR);
4714 : }
4715 0 : PG_CATCH();
4716 : {
4717 : /* Close file first, else unlink might fail on some platforms */
4718 0 : if (Tmpfd >= 0)
4719 0 : close(Tmpfd);
4720 :
4721 : /* Unlink, but ignore any error */
4722 0 : (void) unlink(AutoConfTmpFileName);
4723 :
4724 0 : PG_RE_THROW();
4725 : }
4726 154 : PG_END_TRY();
4727 :
4728 154 : FreeConfigVariables(head);
4729 :
4730 154 : LWLockRelease(AutoFileLock);
4731 154 : }
4732 :
4733 :
4734 : /*
4735 : * Common code for DefineCustomXXXVariable subroutines: allocate the
4736 : * new variable's config struct and fill in generic fields.
4737 : */
4738 : static struct config_generic *
4739 18778 : init_custom_variable(const char *name,
4740 : const char *short_desc,
4741 : const char *long_desc,
4742 : GucContext context,
4743 : int flags,
4744 : enum config_type type)
4745 : {
4746 : struct config_generic *gen;
4747 :
4748 : /*
4749 : * Only allow custom PGC_POSTMASTER variables to be created during shared
4750 : * library preload; any later than that, we can't ensure that the value
4751 : * doesn't change after startup. This is a fatal elog if it happens; just
4752 : * erroring out isn't safe because we don't know what the calling loadable
4753 : * module might already have hooked into.
4754 : */
4755 18778 : if (context == PGC_POSTMASTER &&
4756 32 : !process_shared_preload_libraries_in_progress)
4757 0 : elog(FATAL, "cannot create PGC_POSTMASTER variables after startup");
4758 :
4759 : /*
4760 : * We can't support custom GUC_LIST_QUOTE variables, because the wrong
4761 : * things would happen if such a variable were set or pg_dump'd when the
4762 : * defining extension isn't loaded. Again, treat this as fatal because
4763 : * the loadable module may be partly initialized already.
4764 : */
4765 18778 : if (flags & GUC_LIST_QUOTE)
4766 0 : elog(FATAL, "extensions cannot define GUC_LIST_QUOTE variables");
4767 :
4768 : /*
4769 : * Before pljava commit 398f3b876ed402bdaec8bc804f29e2be95c75139
4770 : * (2015-12-15), two of that module's PGC_USERSET variables facilitated
4771 : * trivial escalation to superuser privileges. Restrict the variables to
4772 : * protect sites that have yet to upgrade pljava.
4773 : */
4774 18778 : if (context == PGC_USERSET &&
4775 14436 : (strcmp(name, "pljava.classpath") == 0 ||
4776 14436 : strcmp(name, "pljava.vmoptions") == 0))
4777 0 : context = PGC_SUSET;
4778 :
4779 : /* As above, an OOM here is FATAL */
4780 18778 : gen = (struct config_generic *) guc_malloc(FATAL, sizeof(struct config_generic));
4781 18778 : memset(gen, 0, sizeof(struct config_generic));
4782 :
4783 18778 : gen->name = guc_strdup(FATAL, name);
4784 18778 : gen->context = context;
4785 18778 : gen->group = CUSTOM_OPTIONS;
4786 18778 : gen->short_desc = short_desc;
4787 18778 : gen->long_desc = long_desc;
4788 18778 : gen->flags = flags;
4789 18778 : gen->vartype = type;
4790 :
4791 18778 : return gen;
4792 : }
4793 :
4794 : /*
4795 : * Common code for DefineCustomXXXVariable subroutines: insert the new
4796 : * variable into the GUC variable hash, replacing any placeholder.
4797 : */
4798 : static void
4799 18778 : define_custom_variable(struct config_generic *variable)
4800 : {
4801 18778 : const char *name = variable->name;
4802 : GUCHashEntry *hentry;
4803 : struct config_generic *pHolder;
4804 :
4805 : /* Check mapping between initial and default value */
4806 : Assert(check_GUC_init(variable));
4807 :
4808 : /*
4809 : * See if there's a placeholder by the same name.
4810 : */
4811 18778 : hentry = (GUCHashEntry *) hash_search(guc_hashtab,
4812 : &name,
4813 : HASH_FIND,
4814 : NULL);
4815 18778 : if (hentry == NULL)
4816 : {
4817 : /*
4818 : * No placeholder to replace, so we can just add it ... but first,
4819 : * make sure it's initialized to its default value.
4820 : */
4821 18670 : InitializeOneGUCOption(variable);
4822 18670 : add_guc_variable(variable, ERROR);
4823 18670 : return;
4824 : }
4825 :
4826 : /*
4827 : * This better be a placeholder
4828 : */
4829 108 : if ((hentry->gucvar->flags & GUC_CUSTOM_PLACEHOLDER) == 0)
4830 0 : ereport(ERROR,
4831 : (errcode(ERRCODE_INTERNAL_ERROR),
4832 : errmsg("attempt to redefine parameter \"%s\"", name)));
4833 :
4834 : Assert(hentry->gucvar->vartype == PGC_STRING);
4835 108 : pHolder = hentry->gucvar;
4836 :
4837 : /*
4838 : * First, set the variable to its default value. We must do this even
4839 : * though we intend to immediately apply a new value, since it's possible
4840 : * that the new value is invalid.
4841 : */
4842 108 : InitializeOneGUCOption(variable);
4843 :
4844 : /*
4845 : * Replace the placeholder in the hash table. We aren't changing the name
4846 : * (at least up to case-folding), so the hash value is unchanged.
4847 : */
4848 108 : hentry->gucname = name;
4849 108 : hentry->gucvar = variable;
4850 :
4851 : /*
4852 : * Remove the placeholder from any lists it's in, too.
4853 : */
4854 108 : RemoveGUCFromLists(pHolder);
4855 :
4856 : /*
4857 : * Assign the string value(s) stored in the placeholder to the real
4858 : * variable. Essentially, we need to duplicate all the active and stacked
4859 : * values, but with appropriate validation and datatype adjustment.
4860 : *
4861 : * If an assignment fails, we report a WARNING and keep going. We don't
4862 : * want to throw ERROR for bad values, because it'd bollix the add-on
4863 : * module that's presumably halfway through getting loaded. In such cases
4864 : * the default or previous state will become active instead.
4865 : */
4866 :
4867 : /* First, apply the reset value if any */
4868 108 : if (pHolder->_string.reset_val)
4869 102 : (void) set_config_option_ext(name, pHolder->_string.reset_val,
4870 : pHolder->reset_scontext,
4871 : pHolder->reset_source,
4872 : pHolder->reset_srole,
4873 : GUC_ACTION_SET, true, WARNING, false);
4874 : /* That should not have resulted in stacking anything */
4875 : Assert(variable->stack == NULL);
4876 :
4877 : /* Now, apply current and stacked values, in the order they were stacked */
4878 108 : reapply_stacked_values(variable, pHolder, pHolder->stack,
4879 108 : *(pHolder->_string.variable),
4880 : pHolder->scontext, pHolder->source,
4881 : pHolder->srole);
4882 :
4883 : /* Also copy over any saved source-location information */
4884 108 : if (pHolder->sourcefile)
4885 86 : set_config_sourcefile(name, pHolder->sourcefile,
4886 : pHolder->sourceline);
4887 :
4888 : /* Now we can free the no-longer-referenced placeholder variable */
4889 108 : free_placeholder(pHolder);
4890 : }
4891 :
4892 : /*
4893 : * Recursive subroutine for define_custom_variable: reapply non-reset values
4894 : *
4895 : * We recurse so that the values are applied in the same order as originally.
4896 : * At each recursion level, apply the upper-level value (passed in) in the
4897 : * fashion implied by the stack entry.
4898 : */
4899 : static void
4900 108 : reapply_stacked_values(struct config_generic *variable,
4901 : struct config_generic *pHolder,
4902 : GucStack *stack,
4903 : const char *curvalue,
4904 : GucContext curscontext, GucSource cursource,
4905 : Oid cursrole)
4906 : {
4907 108 : const char *name = variable->name;
4908 108 : GucStack *oldvarstack = variable->stack;
4909 :
4910 108 : if (stack != NULL)
4911 : {
4912 : /* First, recurse, so that stack items are processed bottom to top */
4913 0 : reapply_stacked_values(variable, pHolder, stack->prev,
4914 0 : stack->prior.val.stringval,
4915 : stack->scontext, stack->source, stack->srole);
4916 :
4917 : /* See how to apply the passed-in value */
4918 0 : switch (stack->state)
4919 : {
4920 0 : case GUC_SAVE:
4921 0 : (void) set_config_option_ext(name, curvalue,
4922 : curscontext, cursource, cursrole,
4923 : GUC_ACTION_SAVE, true,
4924 : WARNING, false);
4925 0 : break;
4926 :
4927 0 : case GUC_SET:
4928 0 : (void) set_config_option_ext(name, curvalue,
4929 : curscontext, cursource, cursrole,
4930 : GUC_ACTION_SET, true,
4931 : WARNING, false);
4932 0 : break;
4933 :
4934 0 : case GUC_LOCAL:
4935 0 : (void) set_config_option_ext(name, curvalue,
4936 : curscontext, cursource, cursrole,
4937 : GUC_ACTION_LOCAL, true,
4938 : WARNING, false);
4939 0 : break;
4940 :
4941 0 : case GUC_SET_LOCAL:
4942 : /* first, apply the masked value as SET */
4943 0 : (void) set_config_option_ext(name, stack->masked.val.stringval,
4944 : stack->masked_scontext,
4945 : PGC_S_SESSION,
4946 : stack->masked_srole,
4947 : GUC_ACTION_SET, true,
4948 : WARNING, false);
4949 : /* then apply the current value as LOCAL */
4950 0 : (void) set_config_option_ext(name, curvalue,
4951 : curscontext, cursource, cursrole,
4952 : GUC_ACTION_LOCAL, true,
4953 : WARNING, false);
4954 0 : break;
4955 : }
4956 :
4957 : /* If we successfully made a stack entry, adjust its nest level */
4958 0 : if (variable->stack != oldvarstack)
4959 0 : variable->stack->nest_level = stack->nest_level;
4960 : }
4961 : else
4962 : {
4963 : /*
4964 : * We are at the end of the stack. If the active/previous value is
4965 : * different from the reset value, it must represent a previously
4966 : * committed session value. Apply it, and then drop the stack entry
4967 : * that set_config_option will have created under the impression that
4968 : * this is to be just a transactional assignment. (We leak the stack
4969 : * entry.)
4970 : */
4971 108 : if (curvalue != pHolder->_string.reset_val ||
4972 102 : curscontext != pHolder->reset_scontext ||
4973 102 : cursource != pHolder->reset_source ||
4974 102 : cursrole != pHolder->reset_srole)
4975 : {
4976 6 : (void) set_config_option_ext(name, curvalue,
4977 : curscontext, cursource, cursrole,
4978 : GUC_ACTION_SET, true, WARNING, false);
4979 6 : if (variable->stack != NULL)
4980 : {
4981 4 : slist_delete(&guc_stack_list, &variable->stack_link);
4982 4 : variable->stack = NULL;
4983 : }
4984 : }
4985 : }
4986 108 : }
4987 :
4988 : /*
4989 : * Free up a no-longer-referenced placeholder GUC variable.
4990 : *
4991 : * This neglects any stack items, so it's possible for some memory to be
4992 : * leaked. Since this can only happen once per session per variable, it
4993 : * doesn't seem worth spending much code on.
4994 : */
4995 : static void
4996 116 : free_placeholder(struct config_generic *pHolder)
4997 : {
4998 : /* Placeholders are always STRING type, so free their values */
4999 : Assert(pHolder->vartype == PGC_STRING);
5000 116 : set_string_field(pHolder, pHolder->_string.variable, NULL);
5001 116 : set_string_field(pHolder, &pHolder->_string.reset_val, NULL);
5002 :
5003 116 : guc_free(unconstify(char *, pHolder->name));
5004 116 : guc_free(pHolder);
5005 116 : }
5006 :
5007 : /*
5008 : * Functions for extensions to call to define their custom GUC variables.
5009 : */
5010 : void
5011 7530 : DefineCustomBoolVariable(const char *name,
5012 : const char *short_desc,
5013 : const char *long_desc,
5014 : bool *valueAddr,
5015 : bool bootValue,
5016 : GucContext context,
5017 : int flags,
5018 : GucBoolCheckHook check_hook,
5019 : GucBoolAssignHook assign_hook,
5020 : GucShowHook show_hook)
5021 : {
5022 : struct config_generic *var;
5023 :
5024 7530 : var = init_custom_variable(name, short_desc, long_desc, context, flags, PGC_BOOL);
5025 7530 : var->_bool.variable = valueAddr;
5026 7530 : var->_bool.boot_val = bootValue;
5027 7530 : var->_bool.reset_val = bootValue;
5028 7530 : var->_bool.check_hook = check_hook;
5029 7530 : var->_bool.assign_hook = assign_hook;
5030 7530 : var->_bool.show_hook = show_hook;
5031 7530 : define_custom_variable(var);
5032 7530 : }
5033 :
5034 : void
5035 100 : DefineCustomIntVariable(const char *name,
5036 : const char *short_desc,
5037 : const char *long_desc,
5038 : int *valueAddr,
5039 : int bootValue,
5040 : int minValue,
5041 : int maxValue,
5042 : GucContext context,
5043 : int flags,
5044 : GucIntCheckHook check_hook,
5045 : GucIntAssignHook assign_hook,
5046 : GucShowHook show_hook)
5047 : {
5048 : struct config_generic *var;
5049 :
5050 100 : var = init_custom_variable(name, short_desc, long_desc, context, flags, PGC_INT);
5051 100 : var->_int.variable = valueAddr;
5052 100 : var->_int.boot_val = bootValue;
5053 100 : var->_int.reset_val = bootValue;
5054 100 : var->_int.min = minValue;
5055 100 : var->_int.max = maxValue;
5056 100 : var->_int.check_hook = check_hook;
5057 100 : var->_int.assign_hook = assign_hook;
5058 100 : var->_int.show_hook = show_hook;
5059 100 : define_custom_variable(var);
5060 100 : }
5061 :
5062 : void
5063 46 : DefineCustomRealVariable(const char *name,
5064 : const char *short_desc,
5065 : const char *long_desc,
5066 : double *valueAddr,
5067 : double bootValue,
5068 : double minValue,
5069 : double maxValue,
5070 : GucContext context,
5071 : int flags,
5072 : GucRealCheckHook check_hook,
5073 : GucRealAssignHook assign_hook,
5074 : GucShowHook show_hook)
5075 : {
5076 : struct config_generic *var;
5077 :
5078 46 : var = init_custom_variable(name, short_desc, long_desc, context, flags, PGC_REAL);
5079 46 : var->_real.variable = valueAddr;
5080 46 : var->_real.boot_val = bootValue;
5081 46 : var->_real.reset_val = bootValue;
5082 46 : var->_real.min = minValue;
5083 46 : var->_real.max = maxValue;
5084 46 : var->_real.check_hook = check_hook;
5085 46 : var->_real.assign_hook = assign_hook;
5086 46 : var->_real.show_hook = show_hook;
5087 46 : define_custom_variable(var);
5088 46 : }
5089 :
5090 : void
5091 7404 : DefineCustomStringVariable(const char *name,
5092 : const char *short_desc,
5093 : const char *long_desc,
5094 : char **valueAddr,
5095 : const char *bootValue,
5096 : GucContext context,
5097 : int flags,
5098 : GucStringCheckHook check_hook,
5099 : GucStringAssignHook assign_hook,
5100 : GucShowHook show_hook)
5101 : {
5102 : struct config_generic *var;
5103 :
5104 7404 : var = init_custom_variable(name, short_desc, long_desc, context, flags, PGC_STRING);
5105 7404 : var->_string.variable = valueAddr;
5106 7404 : var->_string.boot_val = bootValue;
5107 7404 : var->_string.check_hook = check_hook;
5108 7404 : var->_string.assign_hook = assign_hook;
5109 7404 : var->_string.show_hook = show_hook;
5110 7404 : define_custom_variable(var);
5111 7404 : }
5112 :
5113 : void
5114 3698 : DefineCustomEnumVariable(const char *name,
5115 : const char *short_desc,
5116 : const char *long_desc,
5117 : int *valueAddr,
5118 : int bootValue,
5119 : const struct config_enum_entry *options,
5120 : GucContext context,
5121 : int flags,
5122 : GucEnumCheckHook check_hook,
5123 : GucEnumAssignHook assign_hook,
5124 : GucShowHook show_hook)
5125 : {
5126 : struct config_generic *var;
5127 :
5128 3698 : var = init_custom_variable(name, short_desc, long_desc, context, flags, PGC_ENUM);
5129 3698 : var->_enum.variable = valueAddr;
5130 3698 : var->_enum.boot_val = bootValue;
5131 3698 : var->_enum.reset_val = bootValue;
5132 3698 : var->_enum.options = options;
5133 3698 : var->_enum.check_hook = check_hook;
5134 3698 : var->_enum.assign_hook = assign_hook;
5135 3698 : var->_enum.show_hook = show_hook;
5136 3698 : define_custom_variable(var);
5137 3698 : }
5138 :
5139 : /*
5140 : * Mark the given GUC prefix as "reserved".
5141 : *
5142 : * This deletes any existing placeholders matching the prefix,
5143 : * and then prevents new ones from being created.
5144 : * Extensions should call this after they've defined all of their custom
5145 : * GUCs, to help catch misspelled config-file entries.
5146 : */
5147 : void
5148 3836 : MarkGUCPrefixReserved(const char *className)
5149 : {
5150 3836 : int classLen = strlen(className);
5151 : HASH_SEQ_STATUS status;
5152 : GUCHashEntry *hentry;
5153 : MemoryContext oldcontext;
5154 :
5155 : /*
5156 : * Check for existing placeholders. We must actually remove invalid
5157 : * placeholders, else future parallel worker startups will fail.
5158 : */
5159 3836 : hash_seq_init(&status, guc_hashtab);
5160 1604018 : while ((hentry = (GUCHashEntry *) hash_seq_search(&status)) != NULL)
5161 : {
5162 1600182 : struct config_generic *var = hentry->gucvar;
5163 :
5164 1600182 : if ((var->flags & GUC_CUSTOM_PLACEHOLDER) != 0 &&
5165 26 : strncmp(className, var->name, classLen) == 0 &&
5166 8 : var->name[classLen] == GUC_QUALIFIER_SEPARATOR)
5167 : {
5168 8 : ereport(WARNING,
5169 : (errcode(ERRCODE_INVALID_NAME),
5170 : errmsg("invalid configuration parameter name \"%s\", removing it",
5171 : var->name),
5172 : errdetail("\"%s\" is now a reserved prefix.",
5173 : className)));
5174 : /* Remove it from the hash table */
5175 8 : hash_search(guc_hashtab,
5176 8 : &var->name,
5177 : HASH_REMOVE,
5178 : NULL);
5179 : /* Remove it from any lists it's in, too */
5180 8 : RemoveGUCFromLists(var);
5181 : /* And free it */
5182 8 : free_placeholder(var);
5183 : }
5184 : }
5185 :
5186 : /* And remember the name so we can prevent future mistakes. */
5187 3836 : oldcontext = MemoryContextSwitchTo(GUCMemoryContext);
5188 3836 : reserved_class_prefix = lappend(reserved_class_prefix, pstrdup(className));
5189 3836 : MemoryContextSwitchTo(oldcontext);
5190 3836 : }
5191 :
5192 :
5193 : /*
5194 : * Return an array of modified GUC options to show in EXPLAIN.
5195 : *
5196 : * We only report options related to query planning (marked with GUC_EXPLAIN),
5197 : * with values different from their built-in defaults.
5198 : */
5199 : struct config_generic **
5200 12 : get_explain_guc_options(int *num)
5201 : {
5202 : struct config_generic **result;
5203 : dlist_iter iter;
5204 :
5205 12 : *num = 0;
5206 :
5207 : /*
5208 : * While only a fraction of all the GUC variables are marked GUC_EXPLAIN,
5209 : * it doesn't seem worth dynamically resizing this array.
5210 : */
5211 12 : result = palloc(sizeof(struct config_generic *) * hash_get_num_entries(guc_hashtab));
5212 :
5213 : /* We need only consider GUCs with source not PGC_S_DEFAULT */
5214 732 : dlist_foreach(iter, &guc_nondef_list)
5215 : {
5216 720 : struct config_generic *conf = dlist_container(struct config_generic,
5217 : nondef_link, iter.cur);
5218 : bool modified;
5219 :
5220 : /* return only parameters marked for inclusion in explain */
5221 720 : if (!(conf->flags & GUC_EXPLAIN))
5222 696 : continue;
5223 :
5224 : /* return only options visible to the current user */
5225 24 : if (!ConfigOptionIsVisible(conf))
5226 0 : continue;
5227 :
5228 : /* return only options that are different from their boot values */
5229 24 : modified = false;
5230 :
5231 24 : switch (conf->vartype)
5232 : {
5233 12 : case PGC_BOOL:
5234 : {
5235 12 : struct config_bool *lconf = &conf->_bool;
5236 :
5237 12 : modified = (lconf->boot_val != *(lconf->variable));
5238 : }
5239 12 : break;
5240 :
5241 0 : case PGC_INT:
5242 : {
5243 0 : struct config_int *lconf = &conf->_int;
5244 :
5245 0 : modified = (lconf->boot_val != *(lconf->variable));
5246 : }
5247 0 : break;
5248 :
5249 0 : case PGC_REAL:
5250 : {
5251 0 : struct config_real *lconf = &conf->_real;
5252 :
5253 0 : modified = (lconf->boot_val != *(lconf->variable));
5254 : }
5255 0 : break;
5256 :
5257 0 : case PGC_STRING:
5258 : {
5259 0 : struct config_string *lconf = &conf->_string;
5260 :
5261 0 : if (lconf->boot_val == NULL &&
5262 0 : *lconf->variable == NULL)
5263 0 : modified = false;
5264 0 : else if (lconf->boot_val == NULL ||
5265 0 : *lconf->variable == NULL)
5266 0 : modified = true;
5267 : else
5268 0 : modified = (strcmp(lconf->boot_val, *(lconf->variable)) != 0);
5269 : }
5270 0 : break;
5271 :
5272 12 : case PGC_ENUM:
5273 : {
5274 12 : struct config_enum *lconf = &conf->_enum;
5275 :
5276 12 : modified = (lconf->boot_val != *(lconf->variable));
5277 : }
5278 12 : break;
5279 :
5280 0 : default:
5281 0 : elog(ERROR, "unexpected GUC type: %d", conf->vartype);
5282 : }
5283 :
5284 24 : if (!modified)
5285 0 : continue;
5286 :
5287 : /* OK, report it */
5288 24 : result[*num] = conf;
5289 24 : *num = *num + 1;
5290 : }
5291 :
5292 12 : return result;
5293 : }
5294 :
5295 : /*
5296 : * Return GUC variable value by name; optionally return canonical form of
5297 : * name. If the GUC is unset, then throw an error unless missing_ok is true,
5298 : * in which case return NULL. Return value is palloc'd (but *varname isn't).
5299 : */
5300 : char *
5301 12468 : GetConfigOptionByName(const char *name, const char **varname, bool missing_ok)
5302 : {
5303 : struct config_generic *record;
5304 :
5305 12468 : record = find_option(name, false, missing_ok, ERROR);
5306 12430 : if (record == NULL)
5307 : {
5308 6 : if (varname)
5309 0 : *varname = NULL;
5310 6 : return NULL;
5311 : }
5312 :
5313 12424 : if (!ConfigOptionIsVisible(record))
5314 2 : ereport(ERROR,
5315 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
5316 : errmsg("permission denied to examine \"%s\"", name),
5317 : errdetail("Only roles with privileges of the \"%s\" role may examine this parameter.",
5318 : "pg_read_all_settings")));
5319 :
5320 12422 : if (varname)
5321 2890 : *varname = record->name;
5322 :
5323 12422 : return ShowGUCOption(record, true);
5324 : }
5325 :
5326 : /*
5327 : * ShowGUCOption: get string value of variable
5328 : *
5329 : * We express a numeric value in appropriate units if it has units and
5330 : * use_units is true; else you just get the raw number.
5331 : * The result string is palloc'd.
5332 : */
5333 : char *
5334 2094030 : ShowGUCOption(const struct config_generic *record, bool use_units)
5335 : {
5336 : char buffer[256];
5337 : const char *val;
5338 :
5339 2094030 : switch (record->vartype)
5340 : {
5341 588748 : case PGC_BOOL:
5342 : {
5343 588748 : const struct config_bool *conf = &record->_bool;
5344 :
5345 588748 : if (conf->show_hook)
5346 31264 : val = conf->show_hook();
5347 : else
5348 557484 : val = *conf->variable ? "on" : "off";
5349 : }
5350 588748 : break;
5351 :
5352 540210 : case PGC_INT:
5353 : {
5354 540210 : const struct config_int *conf = &record->_int;
5355 :
5356 540210 : if (conf->show_hook)
5357 25134 : val = conf->show_hook();
5358 : else
5359 : {
5360 : /*
5361 : * Use int64 arithmetic to avoid overflows in units
5362 : * conversion.
5363 : */
5364 515076 : int64 result = *conf->variable;
5365 : const char *unit;
5366 :
5367 515076 : if (use_units && result > 0 && (record->flags & GUC_UNIT))
5368 764 : convert_int_from_base_unit(result,
5369 764 : record->flags & GUC_UNIT,
5370 : &result, &unit);
5371 : else
5372 514312 : unit = "";
5373 :
5374 515076 : snprintf(buffer, sizeof(buffer), INT64_FORMAT "%s",
5375 : result, unit);
5376 515076 : val = buffer;
5377 : }
5378 : }
5379 540210 : break;
5380 :
5381 90808 : case PGC_REAL:
5382 : {
5383 90808 : const struct config_real *conf = &record->_real;
5384 :
5385 90808 : if (conf->show_hook)
5386 0 : val = conf->show_hook();
5387 : else
5388 : {
5389 90808 : double result = *conf->variable;
5390 : const char *unit;
5391 :
5392 90808 : if (use_units && result > 0 && (record->flags & GUC_UNIT))
5393 268 : convert_real_from_base_unit(result,
5394 268 : record->flags & GUC_UNIT,
5395 : &result, &unit);
5396 : else
5397 90540 : unit = "";
5398 :
5399 90808 : snprintf(buffer, sizeof(buffer), "%g%s",
5400 : result, unit);
5401 90808 : val = buffer;
5402 : }
5403 : }
5404 90808 : break;
5405 :
5406 697330 : case PGC_STRING:
5407 : {
5408 697330 : const struct config_string *conf = &record->_string;
5409 :
5410 697330 : if (conf->show_hook)
5411 64316 : val = conf->show_hook();
5412 633014 : else if (*conf->variable && **conf->variable)
5413 483944 : val = *conf->variable;
5414 : else
5415 149070 : val = "";
5416 : }
5417 697330 : break;
5418 :
5419 176934 : case PGC_ENUM:
5420 : {
5421 176934 : const struct config_enum *conf = &record->_enum;
5422 :
5423 176934 : if (conf->show_hook)
5424 0 : val = conf->show_hook();
5425 : else
5426 176934 : val = config_enum_lookup_by_value(record, *conf->variable);
5427 : }
5428 176934 : break;
5429 :
5430 0 : default:
5431 : /* just to keep compiler quiet */
5432 0 : val = "???";
5433 0 : break;
5434 : }
5435 :
5436 2094030 : return pstrdup(val);
5437 : }
5438 :
5439 :
5440 : #ifdef EXEC_BACKEND
5441 :
5442 : /*
5443 : * These routines dump out all non-default GUC options into a binary
5444 : * file that is read by all exec'ed backends. The format is:
5445 : *
5446 : * variable name, string, null terminated
5447 : * variable value, string, null terminated
5448 : * variable sourcefile, string, null terminated (empty if none)
5449 : * variable sourceline, integer
5450 : * variable source, integer
5451 : * variable scontext, integer
5452 : * variable srole, OID
5453 : */
5454 : static void
5455 : write_one_nondefault_variable(FILE *fp, struct config_generic *gconf)
5456 : {
5457 : Assert(gconf->source != PGC_S_DEFAULT);
5458 :
5459 : fprintf(fp, "%s", gconf->name);
5460 : fputc(0, fp);
5461 :
5462 : switch (gconf->vartype)
5463 : {
5464 : case PGC_BOOL:
5465 : {
5466 : struct config_bool *conf = &gconf->_bool;
5467 :
5468 : if (*conf->variable)
5469 : fprintf(fp, "true");
5470 : else
5471 : fprintf(fp, "false");
5472 : }
5473 : break;
5474 :
5475 : case PGC_INT:
5476 : {
5477 : struct config_int *conf = &gconf->_int;
5478 :
5479 : fprintf(fp, "%d", *conf->variable);
5480 : }
5481 : break;
5482 :
5483 : case PGC_REAL:
5484 : {
5485 : struct config_real *conf = &gconf->_real;
5486 :
5487 : fprintf(fp, "%.17g", *conf->variable);
5488 : }
5489 : break;
5490 :
5491 : case PGC_STRING:
5492 : {
5493 : struct config_string *conf = &gconf->_string;
5494 :
5495 : if (*conf->variable)
5496 : fprintf(fp, "%s", *conf->variable);
5497 : }
5498 : break;
5499 :
5500 : case PGC_ENUM:
5501 : {
5502 : struct config_enum *conf = &gconf->_enum;
5503 :
5504 : fprintf(fp, "%s",
5505 : config_enum_lookup_by_value(gconf, *conf->variable));
5506 : }
5507 : break;
5508 : }
5509 :
5510 : fputc(0, fp);
5511 :
5512 : if (gconf->sourcefile)
5513 : fprintf(fp, "%s", gconf->sourcefile);
5514 : fputc(0, fp);
5515 :
5516 : fwrite(&gconf->sourceline, 1, sizeof(gconf->sourceline), fp);
5517 : fwrite(&gconf->source, 1, sizeof(gconf->source), fp);
5518 : fwrite(&gconf->scontext, 1, sizeof(gconf->scontext), fp);
5519 : fwrite(&gconf->srole, 1, sizeof(gconf->srole), fp);
5520 : }
5521 :
5522 : void
5523 : write_nondefault_variables(GucContext context)
5524 : {
5525 : int elevel;
5526 : FILE *fp;
5527 : dlist_iter iter;
5528 :
5529 : Assert(context == PGC_POSTMASTER || context == PGC_SIGHUP);
5530 :
5531 : elevel = (context == PGC_SIGHUP) ? LOG : ERROR;
5532 :
5533 : /*
5534 : * Open file
5535 : */
5536 : fp = AllocateFile(CONFIG_EXEC_PARAMS_NEW, "w");
5537 : if (!fp)
5538 : {
5539 : ereport(elevel,
5540 : (errcode_for_file_access(),
5541 : errmsg("could not write to file \"%s\": %m",
5542 : CONFIG_EXEC_PARAMS_NEW)));
5543 : return;
5544 : }
5545 :
5546 : /* We need only consider GUCs with source not PGC_S_DEFAULT */
5547 : dlist_foreach(iter, &guc_nondef_list)
5548 : {
5549 : struct config_generic *gconf = dlist_container(struct config_generic,
5550 : nondef_link, iter.cur);
5551 :
5552 : write_one_nondefault_variable(fp, gconf);
5553 : }
5554 :
5555 : if (FreeFile(fp))
5556 : {
5557 : ereport(elevel,
5558 : (errcode_for_file_access(),
5559 : errmsg("could not write to file \"%s\": %m",
5560 : CONFIG_EXEC_PARAMS_NEW)));
5561 : return;
5562 : }
5563 :
5564 : /*
5565 : * Put new file in place. This could delay on Win32, but we don't hold
5566 : * any exclusive locks.
5567 : */
5568 : rename(CONFIG_EXEC_PARAMS_NEW, CONFIG_EXEC_PARAMS);
5569 : }
5570 :
5571 :
5572 : /*
5573 : * Read string, including null byte from file
5574 : *
5575 : * Return NULL on EOF and nothing read
5576 : */
5577 : static char *
5578 : read_string_with_null(FILE *fp)
5579 : {
5580 : int i = 0,
5581 : ch,
5582 : maxlen = 256;
5583 : char *str = NULL;
5584 :
5585 : do
5586 : {
5587 : if ((ch = fgetc(fp)) == EOF)
5588 : {
5589 : if (i == 0)
5590 : return NULL;
5591 : else
5592 : elog(FATAL, "invalid format of exec config params file");
5593 : }
5594 : if (i == 0)
5595 : str = guc_malloc(FATAL, maxlen);
5596 : else if (i == maxlen)
5597 : str = guc_realloc(FATAL, str, maxlen *= 2);
5598 : str[i++] = ch;
5599 : } while (ch != 0);
5600 :
5601 : return str;
5602 : }
5603 :
5604 :
5605 : /*
5606 : * This routine loads a previous postmaster dump of its non-default
5607 : * settings.
5608 : */
5609 : void
5610 : read_nondefault_variables(void)
5611 : {
5612 : FILE *fp;
5613 : char *varname,
5614 : *varvalue,
5615 : *varsourcefile;
5616 : int varsourceline;
5617 : GucSource varsource;
5618 : GucContext varscontext;
5619 : Oid varsrole;
5620 :
5621 : /*
5622 : * Open file
5623 : */
5624 : fp = AllocateFile(CONFIG_EXEC_PARAMS, "r");
5625 : if (!fp)
5626 : {
5627 : /* File not found is fine */
5628 : if (errno != ENOENT)
5629 : ereport(FATAL,
5630 : (errcode_for_file_access(),
5631 : errmsg("could not read from file \"%s\": %m",
5632 : CONFIG_EXEC_PARAMS)));
5633 : return;
5634 : }
5635 :
5636 : for (;;)
5637 : {
5638 : if ((varname = read_string_with_null(fp)) == NULL)
5639 : break;
5640 :
5641 : if (find_option(varname, true, false, FATAL) == NULL)
5642 : elog(FATAL, "failed to locate variable \"%s\" in exec config params file", varname);
5643 :
5644 : if ((varvalue = read_string_with_null(fp)) == NULL)
5645 : elog(FATAL, "invalid format of exec config params file");
5646 : if ((varsourcefile = read_string_with_null(fp)) == NULL)
5647 : elog(FATAL, "invalid format of exec config params file");
5648 : if (fread(&varsourceline, 1, sizeof(varsourceline), fp) != sizeof(varsourceline))
5649 : elog(FATAL, "invalid format of exec config params file");
5650 : if (fread(&varsource, 1, sizeof(varsource), fp) != sizeof(varsource))
5651 : elog(FATAL, "invalid format of exec config params file");
5652 : if (fread(&varscontext, 1, sizeof(varscontext), fp) != sizeof(varscontext))
5653 : elog(FATAL, "invalid format of exec config params file");
5654 : if (fread(&varsrole, 1, sizeof(varsrole), fp) != sizeof(varsrole))
5655 : elog(FATAL, "invalid format of exec config params file");
5656 :
5657 : (void) set_config_option_ext(varname, varvalue,
5658 : varscontext, varsource, varsrole,
5659 : GUC_ACTION_SET, true, 0, true);
5660 : if (varsourcefile[0])
5661 : set_config_sourcefile(varname, varsourcefile, varsourceline);
5662 :
5663 : guc_free(varname);
5664 : guc_free(varvalue);
5665 : guc_free(varsourcefile);
5666 : }
5667 :
5668 : FreeFile(fp);
5669 : }
5670 : #endif /* EXEC_BACKEND */
5671 :
5672 : /*
5673 : * can_skip_gucvar:
5674 : * Decide whether SerializeGUCState can skip sending this GUC variable,
5675 : * or whether RestoreGUCState can skip resetting this GUC to default.
5676 : *
5677 : * It is somewhat magical and fragile that the same test works for both cases.
5678 : * Realize in particular that we are very likely selecting different sets of
5679 : * GUCs on the leader and worker sides! Be sure you've understood the
5680 : * comments here and in RestoreGUCState thoroughly before changing this.
5681 : */
5682 : static bool
5683 272164 : can_skip_gucvar(struct config_generic *gconf)
5684 : {
5685 : /*
5686 : * We can skip GUCs that are guaranteed to have the same values in leaders
5687 : * and workers. (Note it is critical that the leader and worker have the
5688 : * same idea of which GUCs fall into this category. It's okay to consider
5689 : * context and name for this purpose, since those are unchanging
5690 : * properties of a GUC.)
5691 : *
5692 : * PGC_POSTMASTER variables always have the same value in every child of a
5693 : * particular postmaster, so the worker will certainly have the right
5694 : * value already. Likewise, PGC_INTERNAL variables are set by special
5695 : * mechanisms (if indeed they aren't compile-time constants). So we may
5696 : * always skip these.
5697 : *
5698 : * For all other GUCs, we skip if the GUC has its compiled-in default
5699 : * value (i.e., source == PGC_S_DEFAULT). On the leader side, this means
5700 : * we don't send GUCs that have their default values, which typically
5701 : * saves lots of work. On the worker side, this means we don't need to
5702 : * reset the GUC to default because it already has that value. See
5703 : * comments in RestoreGUCState for more info.
5704 : */
5705 447404 : return gconf->context == PGC_POSTMASTER ||
5706 409100 : gconf->context == PGC_INTERNAL ||
5707 136936 : gconf->source == PGC_S_DEFAULT;
5708 : }
5709 :
5710 : /*
5711 : * estimate_variable_size:
5712 : * Compute space needed for dumping the given GUC variable.
5713 : *
5714 : * It's OK to overestimate, but not to underestimate.
5715 : */
5716 : static Size
5717 59778 : estimate_variable_size(struct config_generic *gconf)
5718 : {
5719 : Size size;
5720 59778 : Size valsize = 0;
5721 :
5722 : /* Skippable GUCs consume zero space. */
5723 59778 : if (can_skip_gucvar(gconf))
5724 26854 : return 0;
5725 :
5726 : /* Name, plus trailing zero byte. */
5727 32924 : size = strlen(gconf->name) + 1;
5728 :
5729 : /* Get the maximum display length of the GUC value. */
5730 32924 : switch (gconf->vartype)
5731 : {
5732 6596 : case PGC_BOOL:
5733 : {
5734 6596 : valsize = 5; /* max(strlen('true'), strlen('false')) */
5735 : }
5736 6596 : break;
5737 :
5738 6742 : case PGC_INT:
5739 : {
5740 6742 : struct config_int *conf = &gconf->_int;
5741 :
5742 : /*
5743 : * Instead of getting the exact display length, use max
5744 : * length. Also reduce the max length for typical ranges of
5745 : * small values. Maximum value is 2147483647, i.e. 10 chars.
5746 : * Include one byte for sign.
5747 : */
5748 6742 : if (abs(*conf->variable) < 1000)
5749 5382 : valsize = 3 + 1;
5750 : else
5751 1360 : valsize = 10 + 1;
5752 : }
5753 6742 : break;
5754 :
5755 1760 : case PGC_REAL:
5756 : {
5757 : /*
5758 : * We are going to print it with %e with REALTYPE_PRECISION
5759 : * fractional digits. Account for sign, leading digit,
5760 : * decimal point, and exponent with up to 3 digits. E.g.
5761 : * -3.99329042340000021e+110
5762 : */
5763 1760 : valsize = 1 + 1 + 1 + REALTYPE_PRECISION + 5;
5764 : }
5765 1760 : break;
5766 :
5767 13852 : case PGC_STRING:
5768 : {
5769 13852 : struct config_string *conf = &gconf->_string;
5770 :
5771 : /*
5772 : * If the value is NULL, we transmit it as an empty string.
5773 : * Although this is not physically the same value, GUC
5774 : * generally treats a NULL the same as empty string.
5775 : */
5776 13852 : if (*conf->variable)
5777 13852 : valsize = strlen(*conf->variable);
5778 : else
5779 0 : valsize = 0;
5780 : }
5781 13852 : break;
5782 :
5783 3974 : case PGC_ENUM:
5784 : {
5785 3974 : struct config_enum *conf = &gconf->_enum;
5786 :
5787 3974 : valsize = strlen(config_enum_lookup_by_value(gconf, *conf->variable));
5788 : }
5789 3974 : break;
5790 : }
5791 :
5792 : /* Allow space for terminating zero-byte for value */
5793 32924 : size = add_size(size, valsize + 1);
5794 :
5795 32924 : if (gconf->sourcefile)
5796 16456 : size = add_size(size, strlen(gconf->sourcefile));
5797 :
5798 : /* Allow space for terminating zero-byte for sourcefile */
5799 32924 : size = add_size(size, 1);
5800 :
5801 : /* Include line whenever file is nonempty. */
5802 32924 : if (gconf->sourcefile && gconf->sourcefile[0])
5803 16456 : size = add_size(size, sizeof(gconf->sourceline));
5804 :
5805 32924 : size = add_size(size, sizeof(gconf->source));
5806 32924 : size = add_size(size, sizeof(gconf->scontext));
5807 32924 : size = add_size(size, sizeof(gconf->srole));
5808 :
5809 32924 : return size;
5810 : }
5811 :
5812 : /*
5813 : * EstimateGUCStateSpace:
5814 : * Returns the size needed to store the GUC state for the current process
5815 : */
5816 : Size
5817 952 : EstimateGUCStateSpace(void)
5818 : {
5819 : Size size;
5820 : dlist_iter iter;
5821 :
5822 : /* Add space reqd for saving the data size of the guc state */
5823 952 : size = sizeof(Size);
5824 :
5825 : /*
5826 : * Add up the space needed for each GUC variable.
5827 : *
5828 : * We need only process non-default GUCs.
5829 : */
5830 60730 : dlist_foreach(iter, &guc_nondef_list)
5831 : {
5832 59778 : struct config_generic *gconf = dlist_container(struct config_generic,
5833 : nondef_link, iter.cur);
5834 :
5835 59778 : size = add_size(size, estimate_variable_size(gconf));
5836 : }
5837 :
5838 952 : return size;
5839 : }
5840 :
5841 : /*
5842 : * do_serialize:
5843 : * Copies the formatted string into the destination. Moves ahead the
5844 : * destination pointer, and decrements the maxbytes by that many bytes. If
5845 : * maxbytes is not sufficient to copy the string, error out.
5846 : */
5847 : static void
5848 98772 : do_serialize(char **destptr, Size *maxbytes, const char *fmt,...)
5849 : {
5850 : va_list vargs;
5851 : int n;
5852 :
5853 98772 : if (*maxbytes <= 0)
5854 0 : elog(ERROR, "not enough space to serialize GUC state");
5855 :
5856 98772 : va_start(vargs, fmt);
5857 98772 : n = vsnprintf(*destptr, *maxbytes, fmt, vargs);
5858 98772 : va_end(vargs);
5859 :
5860 98772 : if (n < 0)
5861 : {
5862 : /* Shouldn't happen. Better show errno description. */
5863 0 : elog(ERROR, "vsnprintf failed: %m with format string \"%s\"", fmt);
5864 : }
5865 98772 : if (n >= *maxbytes)
5866 : {
5867 : /* This shouldn't happen either, really. */
5868 0 : elog(ERROR, "not enough space to serialize GUC state");
5869 : }
5870 :
5871 : /* Shift the destptr ahead of the null terminator */
5872 98772 : *destptr += n + 1;
5873 98772 : *maxbytes -= n + 1;
5874 98772 : }
5875 :
5876 : /* Binary copy version of do_serialize() */
5877 : static void
5878 115228 : do_serialize_binary(char **destptr, Size *maxbytes, void *val, Size valsize)
5879 : {
5880 115228 : if (valsize > *maxbytes)
5881 0 : elog(ERROR, "not enough space to serialize GUC state");
5882 :
5883 115228 : memcpy(*destptr, val, valsize);
5884 115228 : *destptr += valsize;
5885 115228 : *maxbytes -= valsize;
5886 115228 : }
5887 :
5888 : /*
5889 : * serialize_variable:
5890 : * Dumps name, value and other information of a GUC variable into destptr.
5891 : */
5892 : static void
5893 59778 : serialize_variable(char **destptr, Size *maxbytes,
5894 : struct config_generic *gconf)
5895 : {
5896 : /* Ignore skippable GUCs. */
5897 59778 : if (can_skip_gucvar(gconf))
5898 26854 : return;
5899 :
5900 32924 : do_serialize(destptr, maxbytes, "%s", gconf->name);
5901 :
5902 32924 : switch (gconf->vartype)
5903 : {
5904 6596 : case PGC_BOOL:
5905 : {
5906 6596 : struct config_bool *conf = &gconf->_bool;
5907 :
5908 6596 : do_serialize(destptr, maxbytes,
5909 6596 : (*conf->variable ? "true" : "false"));
5910 : }
5911 6596 : break;
5912 :
5913 6742 : case PGC_INT:
5914 : {
5915 6742 : struct config_int *conf = &gconf->_int;
5916 :
5917 6742 : do_serialize(destptr, maxbytes, "%d", *conf->variable);
5918 : }
5919 6742 : break;
5920 :
5921 1760 : case PGC_REAL:
5922 : {
5923 1760 : struct config_real *conf = &gconf->_real;
5924 :
5925 1760 : do_serialize(destptr, maxbytes, "%.*e",
5926 1760 : REALTYPE_PRECISION, *conf->variable);
5927 : }
5928 1760 : break;
5929 :
5930 13852 : case PGC_STRING:
5931 : {
5932 13852 : struct config_string *conf = &gconf->_string;
5933 :
5934 : /* NULL becomes empty string, see estimate_variable_size() */
5935 13852 : do_serialize(destptr, maxbytes, "%s",
5936 13852 : *conf->variable ? *conf->variable : "");
5937 : }
5938 13852 : break;
5939 :
5940 3974 : case PGC_ENUM:
5941 : {
5942 3974 : struct config_enum *conf = &gconf->_enum;
5943 :
5944 3974 : do_serialize(destptr, maxbytes, "%s",
5945 3974 : config_enum_lookup_by_value(gconf, *conf->variable));
5946 : }
5947 3974 : break;
5948 : }
5949 :
5950 32924 : do_serialize(destptr, maxbytes, "%s",
5951 32924 : (gconf->sourcefile ? gconf->sourcefile : ""));
5952 :
5953 32924 : if (gconf->sourcefile && gconf->sourcefile[0])
5954 16456 : do_serialize_binary(destptr, maxbytes, &gconf->sourceline,
5955 : sizeof(gconf->sourceline));
5956 :
5957 32924 : do_serialize_binary(destptr, maxbytes, &gconf->source,
5958 : sizeof(gconf->source));
5959 32924 : do_serialize_binary(destptr, maxbytes, &gconf->scontext,
5960 : sizeof(gconf->scontext));
5961 32924 : do_serialize_binary(destptr, maxbytes, &gconf->srole,
5962 : sizeof(gconf->srole));
5963 : }
5964 :
5965 : /*
5966 : * SerializeGUCState:
5967 : * Dumps the complete GUC state onto the memory location at start_address.
5968 : */
5969 : void
5970 952 : SerializeGUCState(Size maxsize, char *start_address)
5971 : {
5972 : char *curptr;
5973 : Size actual_size;
5974 : Size bytes_left;
5975 : dlist_iter iter;
5976 :
5977 : /* Reserve space for saving the actual size of the guc state */
5978 : Assert(maxsize > sizeof(actual_size));
5979 952 : curptr = start_address + sizeof(actual_size);
5980 952 : bytes_left = maxsize - sizeof(actual_size);
5981 :
5982 : /* We need only consider GUCs with source not PGC_S_DEFAULT */
5983 60730 : dlist_foreach(iter, &guc_nondef_list)
5984 : {
5985 59778 : struct config_generic *gconf = dlist_container(struct config_generic,
5986 : nondef_link, iter.cur);
5987 :
5988 59778 : serialize_variable(&curptr, &bytes_left, gconf);
5989 : }
5990 :
5991 : /* Store actual size without assuming alignment of start_address. */
5992 952 : actual_size = maxsize - bytes_left - sizeof(actual_size);
5993 952 : memcpy(start_address, &actual_size, sizeof(actual_size));
5994 952 : }
5995 :
5996 : /*
5997 : * read_gucstate:
5998 : * Actually it does not read anything, just returns the srcptr. But it does
5999 : * move the srcptr past the terminating zero byte, so that the caller is ready
6000 : * to read the next string.
6001 : */
6002 : static char *
6003 311520 : read_gucstate(char **srcptr, char *srcend)
6004 : {
6005 311520 : char *retptr = *srcptr;
6006 : char *ptr;
6007 :
6008 311520 : if (*srcptr >= srcend)
6009 0 : elog(ERROR, "incomplete GUC state");
6010 :
6011 : /* The string variables are all null terminated */
6012 7701308 : for (ptr = *srcptr; ptr < srcend && *ptr != '\0'; ptr++)
6013 : ;
6014 :
6015 311520 : if (ptr >= srcend)
6016 0 : elog(ERROR, "could not find null terminator in GUC state");
6017 :
6018 : /* Set the new position to the byte following the terminating NUL */
6019 311520 : *srcptr = ptr + 1;
6020 :
6021 311520 : return retptr;
6022 : }
6023 :
6024 : /* Binary read version of read_gucstate(). Copies into dest */
6025 : static void
6026 361440 : read_gucstate_binary(char **srcptr, char *srcend, void *dest, Size size)
6027 : {
6028 361440 : if (*srcptr + size > srcend)
6029 0 : elog(ERROR, "incomplete GUC state");
6030 :
6031 361440 : memcpy(dest, *srcptr, size);
6032 361440 : *srcptr += size;
6033 361440 : }
6034 :
6035 : /*
6036 : * Callback used to add a context message when reporting errors that occur
6037 : * while trying to restore GUCs in parallel workers.
6038 : */
6039 : static void
6040 0 : guc_restore_error_context_callback(void *arg)
6041 : {
6042 0 : char **error_context_name_and_value = (char **) arg;
6043 :
6044 0 : if (error_context_name_and_value)
6045 0 : errcontext("while setting parameter \"%s\" to \"%s\"",
6046 : error_context_name_and_value[0],
6047 0 : error_context_name_and_value[1]);
6048 0 : }
6049 :
6050 : /*
6051 : * RestoreGUCState:
6052 : * Reads the GUC state at the specified address and sets this process's
6053 : * GUCs to match.
6054 : *
6055 : * Note that this provides the worker with only a very shallow view of the
6056 : * leader's GUC state: we'll know about the currently active values, but not
6057 : * about stacked or reset values. That's fine since the worker is just
6058 : * executing one part of a query, within which the active values won't change
6059 : * and the stacked values are invisible.
6060 : */
6061 : void
6062 2884 : RestoreGUCState(void *gucstate)
6063 : {
6064 : char *varname,
6065 : *varvalue,
6066 : *varsourcefile;
6067 : int varsourceline;
6068 : GucSource varsource;
6069 : GucContext varscontext;
6070 : Oid varsrole;
6071 2884 : char *srcptr = (char *) gucstate;
6072 : char *srcend;
6073 : Size len;
6074 : dlist_mutable_iter iter;
6075 : ErrorContextCallback error_context_callback;
6076 :
6077 : /*
6078 : * First, ensure that all potentially-shippable GUCs are reset to their
6079 : * default values. We must not touch those GUCs that the leader will
6080 : * never ship, while there is no need to touch those that are shippable
6081 : * but already have their default values. Thus, this ends up being the
6082 : * same test that SerializeGUCState uses, even though the sets of
6083 : * variables involved may well be different since the leader's set of
6084 : * variables-not-at-default-values can differ from the set that are
6085 : * not-default in this freshly started worker.
6086 : *
6087 : * Once we have set all the potentially-shippable GUCs to default values,
6088 : * restoring the GUCs that the leader sent (because they had non-default
6089 : * values over there) leads us to exactly the set of GUC values that the
6090 : * leader has. This is true even though the worker may have initially
6091 : * absorbed postgresql.conf settings that the leader hasn't yet seen, or
6092 : * ALTER USER/DATABASE SET settings that were established after the leader
6093 : * started.
6094 : *
6095 : * Note that ensuring all the potential target GUCs are at PGC_S_DEFAULT
6096 : * also ensures that set_config_option won't refuse to set them because of
6097 : * source-priority comparisons.
6098 : */
6099 155492 : dlist_foreach_modify(iter, &guc_nondef_list)
6100 : {
6101 152608 : struct config_generic *gconf = dlist_container(struct config_generic,
6102 : nondef_link, iter.cur);
6103 :
6104 : /* Do nothing if non-shippable or if already at PGC_S_DEFAULT. */
6105 152608 : if (can_skip_gucvar(gconf))
6106 81520 : continue;
6107 :
6108 : /*
6109 : * We can use InitializeOneGUCOption to reset the GUC to default, but
6110 : * first we must free any existing subsidiary data to avoid leaking
6111 : * memory. The stack must be empty, but we have to clean up all other
6112 : * fields. Beware that there might be duplicate value or "extra"
6113 : * pointers. We also have to be sure to take it out of any lists it's
6114 : * in.
6115 : */
6116 : Assert(gconf->stack == NULL);
6117 71088 : guc_free(gconf->extra);
6118 71088 : guc_free(gconf->last_reported);
6119 71088 : guc_free(gconf->sourcefile);
6120 71088 : switch (gconf->vartype)
6121 : {
6122 38418 : case PGC_BOOL:
6123 : case PGC_INT:
6124 : case PGC_REAL:
6125 : case PGC_ENUM:
6126 : /* no need to do anything */
6127 38418 : break;
6128 32670 : case PGC_STRING:
6129 : {
6130 32670 : struct config_string *conf = &gconf->_string;
6131 :
6132 32670 : guc_free(*conf->variable);
6133 32670 : if (conf->reset_val && conf->reset_val != *conf->variable)
6134 0 : guc_free(conf->reset_val);
6135 32670 : break;
6136 : }
6137 : }
6138 71088 : if (gconf->reset_extra && gconf->reset_extra != gconf->extra)
6139 0 : guc_free(gconf->reset_extra);
6140 : /* Remove it from any lists it's in. */
6141 71088 : RemoveGUCFromLists(gconf);
6142 : /* Now we can reset the struct to PGS_S_DEFAULT state. */
6143 71088 : InitializeOneGUCOption(gconf);
6144 : }
6145 :
6146 : /* First item is the length of the subsequent data */
6147 2884 : memcpy(&len, gucstate, sizeof(len));
6148 :
6149 2884 : srcptr += sizeof(len);
6150 2884 : srcend = srcptr + len;
6151 :
6152 : /* If the GUC value check fails, we want errors to show useful context. */
6153 2884 : error_context_callback.callback = guc_restore_error_context_callback;
6154 2884 : error_context_callback.previous = error_context_stack;
6155 2884 : error_context_callback.arg = NULL;
6156 2884 : error_context_stack = &error_context_callback;
6157 :
6158 : /* Restore all the listed GUCs. */
6159 106724 : while (srcptr < srcend)
6160 : {
6161 : int result;
6162 : char *error_context_name_and_value[2];
6163 :
6164 103840 : varname = read_gucstate(&srcptr, srcend);
6165 103840 : varvalue = read_gucstate(&srcptr, srcend);
6166 103840 : varsourcefile = read_gucstate(&srcptr, srcend);
6167 103840 : if (varsourcefile[0])
6168 49920 : read_gucstate_binary(&srcptr, srcend,
6169 : &varsourceline, sizeof(varsourceline));
6170 : else
6171 53920 : varsourceline = 0;
6172 103840 : read_gucstate_binary(&srcptr, srcend,
6173 : &varsource, sizeof(varsource));
6174 103840 : read_gucstate_binary(&srcptr, srcend,
6175 : &varscontext, sizeof(varscontext));
6176 103840 : read_gucstate_binary(&srcptr, srcend,
6177 : &varsrole, sizeof(varsrole));
6178 :
6179 103840 : error_context_name_and_value[0] = varname;
6180 103840 : error_context_name_and_value[1] = varvalue;
6181 103840 : error_context_callback.arg = &error_context_name_and_value[0];
6182 103840 : result = set_config_option_ext(varname, varvalue,
6183 : varscontext, varsource, varsrole,
6184 : GUC_ACTION_SET, true, ERROR, true);
6185 103840 : if (result <= 0)
6186 0 : ereport(ERROR,
6187 : (errcode(ERRCODE_INTERNAL_ERROR),
6188 : errmsg("parameter \"%s\" could not be set", varname)));
6189 103840 : if (varsourcefile[0])
6190 49920 : set_config_sourcefile(varname, varsourcefile, varsourceline);
6191 103840 : error_context_callback.arg = NULL;
6192 : }
6193 :
6194 2884 : error_context_stack = error_context_callback.previous;
6195 2884 : }
6196 :
6197 : /*
6198 : * A little "long argument" simulation, although not quite GNU
6199 : * compliant. Takes a string of the form "some-option=some value" and
6200 : * returns name = "some_option" and value = "some value" in palloc'ed
6201 : * storage. Note that '-' is converted to '_' in the option name. If
6202 : * there is no '=' in the input string then value will be NULL.
6203 : */
6204 : void
6205 56742 : ParseLongOption(const char *string, char **name, char **value)
6206 : {
6207 : size_t equal_pos;
6208 :
6209 : Assert(string);
6210 : Assert(name);
6211 : Assert(value);
6212 :
6213 56742 : equal_pos = strcspn(string, "=");
6214 :
6215 56742 : if (string[equal_pos] == '=')
6216 : {
6217 56740 : *name = palloc(equal_pos + 1);
6218 56740 : strlcpy(*name, string, equal_pos + 1);
6219 :
6220 56740 : *value = pstrdup(&string[equal_pos + 1]);
6221 : }
6222 : else
6223 : {
6224 : /* no equal sign in string */
6225 2 : *name = pstrdup(string);
6226 2 : *value = NULL;
6227 : }
6228 :
6229 795458 : for (char *cp = *name; *cp; cp++)
6230 738716 : if (*cp == '-')
6231 1716 : *cp = '_';
6232 56742 : }
6233 :
6234 :
6235 : /*
6236 : * Transform array of GUC settings into lists of names and values. The lists
6237 : * are faster to process in cases where the settings must be applied
6238 : * repeatedly (e.g. for each function invocation).
6239 : */
6240 : void
6241 7260 : TransformGUCArray(ArrayType *array, List **names, List **values)
6242 : {
6243 : Assert(array != NULL);
6244 : Assert(ARR_ELEMTYPE(array) == TEXTOID);
6245 : Assert(ARR_NDIM(array) == 1);
6246 : Assert(ARR_LBOUND(array)[0] == 1);
6247 :
6248 7260 : *names = NIL;
6249 7260 : *values = NIL;
6250 49736 : for (int i = 1; i <= ARR_DIMS(array)[0]; i++)
6251 : {
6252 : Datum d;
6253 : bool isnull;
6254 : char *s;
6255 : char *name;
6256 : char *value;
6257 :
6258 42476 : d = array_ref(array, 1, &i,
6259 : -1 /* varlenarray */ ,
6260 : -1 /* TEXT's typlen */ ,
6261 : false /* TEXT's typbyval */ ,
6262 : TYPALIGN_INT /* TEXT's typalign */ ,
6263 : &isnull);
6264 :
6265 42476 : if (isnull)
6266 0 : continue;
6267 :
6268 42476 : s = TextDatumGetCString(d);
6269 :
6270 42476 : ParseLongOption(s, &name, &value);
6271 42476 : if (!value)
6272 : {
6273 0 : ereport(WARNING,
6274 : (errcode(ERRCODE_SYNTAX_ERROR),
6275 : errmsg("could not parse setting for parameter \"%s\"",
6276 : name)));
6277 0 : pfree(name);
6278 0 : continue;
6279 : }
6280 :
6281 42476 : *names = lappend(*names, name);
6282 42476 : *values = lappend(*values, value);
6283 :
6284 42476 : pfree(s);
6285 : }
6286 7260 : }
6287 :
6288 :
6289 : /*
6290 : * Handle options fetched from pg_db_role_setting.setconfig,
6291 : * pg_proc.proconfig, etc. Caller must specify proper context/source/action.
6292 : *
6293 : * The array parameter must be an array of TEXT (it must not be NULL).
6294 : */
6295 : void
6296 7128 : ProcessGUCArray(ArrayType *array,
6297 : GucContext context, GucSource source, GucAction action)
6298 : {
6299 : List *gucNames;
6300 : List *gucValues;
6301 : ListCell *lc1;
6302 : ListCell *lc2;
6303 :
6304 7128 : TransformGUCArray(array, &gucNames, &gucValues);
6305 49460 : forboth(lc1, gucNames, lc2, gucValues)
6306 : {
6307 42344 : char *name = lfirst(lc1);
6308 42344 : char *value = lfirst(lc2);
6309 :
6310 42344 : (void) set_config_option(name, value,
6311 : context, source,
6312 : action, true, 0, false);
6313 :
6314 42332 : pfree(name);
6315 42332 : pfree(value);
6316 : }
6317 :
6318 7116 : list_free(gucNames);
6319 7116 : list_free(gucValues);
6320 7116 : }
6321 :
6322 :
6323 : /*
6324 : * Add an entry to an option array. The array parameter may be NULL
6325 : * to indicate the current table entry is NULL.
6326 : */
6327 : ArrayType *
6328 1440 : GUCArrayAdd(ArrayType *array, const char *name, const char *value)
6329 : {
6330 : struct config_generic *record;
6331 : Datum datum;
6332 : char *newval;
6333 : ArrayType *a;
6334 :
6335 : Assert(name);
6336 : Assert(value);
6337 :
6338 : /* test if the option is valid and we're allowed to set it */
6339 1440 : (void) validate_option_array_item(name, value, false);
6340 :
6341 : /* normalize name (converts obsolete GUC names to modern spellings) */
6342 1436 : record = find_option(name, false, true, WARNING);
6343 1436 : if (record)
6344 1436 : name = record->name;
6345 :
6346 : /* build new item for array */
6347 1436 : newval = psprintf("%s=%s", name, value);
6348 1436 : datum = CStringGetTextDatum(newval);
6349 :
6350 1436 : if (array)
6351 : {
6352 : int index;
6353 : bool isnull;
6354 :
6355 : Assert(ARR_ELEMTYPE(array) == TEXTOID);
6356 : Assert(ARR_NDIM(array) == 1);
6357 : Assert(ARR_LBOUND(array)[0] == 1);
6358 :
6359 1094 : index = ARR_DIMS(array)[0] + 1; /* add after end */
6360 :
6361 4344 : for (int i = 1; i <= ARR_DIMS(array)[0]; i++)
6362 : {
6363 : Datum d;
6364 : char *current;
6365 :
6366 3264 : d = array_ref(array, 1, &i,
6367 : -1 /* varlenarray */ ,
6368 : -1 /* TEXT's typlen */ ,
6369 : false /* TEXT's typbyval */ ,
6370 : TYPALIGN_INT /* TEXT's typalign */ ,
6371 : &isnull);
6372 3264 : if (isnull)
6373 0 : continue;
6374 3264 : current = TextDatumGetCString(d);
6375 :
6376 : /* check for match up through and including '=' */
6377 3264 : if (strncmp(current, newval, strlen(name) + 1) == 0)
6378 : {
6379 14 : index = i;
6380 14 : break;
6381 : }
6382 : }
6383 :
6384 1094 : a = array_set(array, 1, &index,
6385 : datum,
6386 : false,
6387 : -1 /* varlena array */ ,
6388 : -1 /* TEXT's typlen */ ,
6389 : false /* TEXT's typbyval */ ,
6390 : TYPALIGN_INT /* TEXT's typalign */ );
6391 : }
6392 : else
6393 342 : a = construct_array_builtin(&datum, 1, TEXTOID);
6394 :
6395 1436 : return a;
6396 : }
6397 :
6398 :
6399 : /*
6400 : * Delete an entry from an option array. The array parameter may be NULL
6401 : * to indicate the current table entry is NULL. Also, if the return value
6402 : * is NULL then a null should be stored.
6403 : */
6404 : ArrayType *
6405 40 : GUCArrayDelete(ArrayType *array, const char *name)
6406 : {
6407 : struct config_generic *record;
6408 : ArrayType *newarray;
6409 : int index;
6410 :
6411 : Assert(name);
6412 :
6413 : /* test if the option is valid and we're allowed to set it */
6414 40 : (void) validate_option_array_item(name, NULL, false);
6415 :
6416 : /* normalize name (converts obsolete GUC names to modern spellings) */
6417 36 : record = find_option(name, false, true, WARNING);
6418 36 : if (record)
6419 30 : name = record->name;
6420 :
6421 : /* if array is currently null, then surely nothing to delete */
6422 36 : if (!array)
6423 4 : return NULL;
6424 :
6425 32 : newarray = NULL;
6426 32 : index = 1;
6427 :
6428 102 : for (int i = 1; i <= ARR_DIMS(array)[0]; i++)
6429 : {
6430 : Datum d;
6431 : char *val;
6432 : bool isnull;
6433 :
6434 70 : d = array_ref(array, 1, &i,
6435 : -1 /* varlenarray */ ,
6436 : -1 /* TEXT's typlen */ ,
6437 : false /* TEXT's typbyval */ ,
6438 : TYPALIGN_INT /* TEXT's typalign */ ,
6439 : &isnull);
6440 70 : if (isnull)
6441 32 : continue;
6442 70 : val = TextDatumGetCString(d);
6443 :
6444 : /* ignore entry if it's what we want to delete */
6445 70 : if (strncmp(val, name, strlen(name)) == 0
6446 32 : && val[strlen(name)] == '=')
6447 32 : continue;
6448 :
6449 : /* else add it to the output array */
6450 38 : if (newarray)
6451 30 : newarray = array_set(newarray, 1, &index,
6452 : d,
6453 : false,
6454 : -1 /* varlenarray */ ,
6455 : -1 /* TEXT's typlen */ ,
6456 : false /* TEXT's typbyval */ ,
6457 : TYPALIGN_INT /* TEXT's typalign */ );
6458 : else
6459 8 : newarray = construct_array_builtin(&d, 1, TEXTOID);
6460 :
6461 38 : index++;
6462 : }
6463 :
6464 32 : return newarray;
6465 : }
6466 :
6467 :
6468 : /*
6469 : * Given a GUC array, delete all settings from it that our permission
6470 : * level allows: if superuser, delete them all; if regular user, only
6471 : * those that are PGC_USERSET or we have permission to set
6472 : */
6473 : ArrayType *
6474 2 : GUCArrayReset(ArrayType *array)
6475 : {
6476 : ArrayType *newarray;
6477 : int index;
6478 :
6479 : /* if array is currently null, nothing to do */
6480 2 : if (!array)
6481 0 : return NULL;
6482 :
6483 : /* if we're superuser, we can delete everything, so just do it */
6484 2 : if (superuser())
6485 0 : return NULL;
6486 :
6487 2 : newarray = NULL;
6488 2 : index = 1;
6489 :
6490 6 : for (int i = 1; i <= ARR_DIMS(array)[0]; i++)
6491 : {
6492 : Datum d;
6493 : char *val;
6494 : char *eqsgn;
6495 : bool isnull;
6496 :
6497 4 : d = array_ref(array, 1, &i,
6498 : -1 /* varlenarray */ ,
6499 : -1 /* TEXT's typlen */ ,
6500 : false /* TEXT's typbyval */ ,
6501 : TYPALIGN_INT /* TEXT's typalign */ ,
6502 : &isnull);
6503 4 : if (isnull)
6504 2 : continue;
6505 4 : val = TextDatumGetCString(d);
6506 :
6507 4 : eqsgn = strchr(val, '=');
6508 4 : *eqsgn = '\0';
6509 :
6510 : /* skip if we have permission to delete it */
6511 4 : if (validate_option_array_item(val, NULL, true))
6512 2 : continue;
6513 :
6514 : /* else add it to the output array */
6515 2 : if (newarray)
6516 0 : newarray = array_set(newarray, 1, &index,
6517 : d,
6518 : false,
6519 : -1 /* varlenarray */ ,
6520 : -1 /* TEXT's typlen */ ,
6521 : false /* TEXT's typbyval */ ,
6522 : TYPALIGN_INT /* TEXT's typalign */ );
6523 : else
6524 2 : newarray = construct_array_builtin(&d, 1, TEXTOID);
6525 :
6526 2 : index++;
6527 2 : pfree(val);
6528 : }
6529 :
6530 2 : return newarray;
6531 : }
6532 :
6533 : /*
6534 : * Validate a proposed option setting for GUCArrayAdd/Delete/Reset.
6535 : *
6536 : * name is the option name. value is the proposed value for the Add case,
6537 : * or NULL for the Delete/Reset cases. If skipIfNoPermissions is true, it's
6538 : * not an error to have no permissions to set the option.
6539 : *
6540 : * Returns true if OK, false if skipIfNoPermissions is true and user does not
6541 : * have permission to change this option (all other error cases result in an
6542 : * error being thrown).
6543 : */
6544 : static bool
6545 1484 : validate_option_array_item(const char *name, const char *value,
6546 : bool skipIfNoPermissions)
6547 :
6548 : {
6549 : struct config_generic *gconf;
6550 : bool reset_custom;
6551 :
6552 : /*
6553 : * There are three cases to consider:
6554 : *
6555 : * name is a known GUC variable. Check the value normally, check
6556 : * permissions normally (i.e., allow if variable is USERSET, or if it's
6557 : * SUSET and user is superuser or holds ACL_SET permissions).
6558 : *
6559 : * name is not known, but exists or can be created as a placeholder (i.e.,
6560 : * it has a valid custom name). We allow this case if you're a superuser,
6561 : * otherwise not. Superusers are assumed to know what they're doing. We
6562 : * can't allow it for other users, because when the placeholder is
6563 : * resolved it might turn out to be a SUSET variable. (With currently
6564 : * available infrastructure, we can actually handle such cases within the
6565 : * current session --- but once an entry is made in pg_db_role_setting,
6566 : * it's assumed to be fully validated.)
6567 : *
6568 : * name is not known and can't be created as a placeholder. Throw error,
6569 : * unless skipIfNoPermissions or reset_custom is true. If reset_custom is
6570 : * true, this is a RESET or RESET ALL operation for an unknown custom GUC
6571 : * with a reserved prefix, in which case we want to fall through to the
6572 : * placeholder case described in the preceding paragraph (else there'd be
6573 : * no way for users to remove them). Otherwise, return false.
6574 : */
6575 1484 : reset_custom = (!value && valid_custom_variable_name(name));
6576 1484 : gconf = find_option(name, true, skipIfNoPermissions || reset_custom, ERROR);
6577 1478 : if (!gconf && !reset_custom)
6578 : {
6579 : /* not known, failed to make a placeholder */
6580 0 : return false;
6581 : }
6582 :
6583 1478 : if (!gconf || gconf->flags & GUC_CUSTOM_PLACEHOLDER)
6584 : {
6585 : /*
6586 : * We cannot do any meaningful check on the value, so only permissions
6587 : * are useful to check.
6588 : */
6589 12 : if (superuser() ||
6590 0 : pg_parameter_aclcheck(name, GetUserId(), ACL_SET) == ACLCHECK_OK)
6591 12 : return true;
6592 0 : if (skipIfNoPermissions)
6593 0 : return false;
6594 0 : ereport(ERROR,
6595 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
6596 : errmsg("permission denied to set parameter \"%s\"", name)));
6597 : }
6598 :
6599 : /* manual permissions check so we can avoid an error being thrown */
6600 1466 : if (gconf->context == PGC_USERSET)
6601 : /* ok */ ;
6602 440 : else if (gconf->context == PGC_SUSET &&
6603 232 : (superuser() ||
6604 12 : pg_parameter_aclcheck(name, GetUserId(), ACL_SET) == ACLCHECK_OK))
6605 : /* ok */ ;
6606 4 : else if (skipIfNoPermissions)
6607 2 : return false;
6608 : /* if a permissions error should be thrown, let set_config_option do it */
6609 :
6610 : /* test for permissions and valid option value */
6611 1464 : (void) set_config_option(name, value,
6612 1464 : superuser() ? PGC_SUSET : PGC_USERSET,
6613 : PGC_S_TEST, GUC_ACTION_SET, false, 0, false);
6614 :
6615 1462 : return true;
6616 : }
6617 :
6618 :
6619 : /*
6620 : * Called by check_hooks that want to override the normal
6621 : * ERRCODE_INVALID_PARAMETER_VALUE SQLSTATE for check hook failures.
6622 : *
6623 : * Note that GUC_check_errmsg() etc are just macros that result in a direct
6624 : * assignment to the associated variables. That is ugly, but forced by the
6625 : * limitations of C's macro mechanisms.
6626 : */
6627 : void
6628 42 : GUC_check_errcode(int sqlerrcode)
6629 : {
6630 42 : GUC_check_errcode_value = sqlerrcode;
6631 42 : }
6632 :
6633 :
6634 : /*
6635 : * Convenience functions to manage calling a variable's check_hook.
6636 : * These mostly take care of the protocol for letting check hooks supply
6637 : * portions of the error report on failure.
6638 : */
6639 :
6640 : static bool
6641 458036 : call_bool_check_hook(const struct config_generic *conf, bool *newval, void **extra,
6642 : GucSource source, int elevel)
6643 : {
6644 : /* Quick success if no hook */
6645 458036 : if (!conf->_bool.check_hook)
6646 419694 : return true;
6647 :
6648 : /* Reset variables that might be set by hook */
6649 38342 : GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
6650 38342 : GUC_check_errmsg_string = NULL;
6651 38342 : GUC_check_errdetail_string = NULL;
6652 38342 : GUC_check_errhint_string = NULL;
6653 :
6654 38342 : if (!conf->_bool.check_hook(newval, extra, source))
6655 : {
6656 24 : ereport(elevel,
6657 : (errcode(GUC_check_errcode_value),
6658 : GUC_check_errmsg_string ?
6659 : errmsg_internal("%s", GUC_check_errmsg_string) :
6660 : errmsg("invalid value for parameter \"%s\": %d",
6661 : conf->name, (int) *newval),
6662 : GUC_check_errdetail_string ?
6663 : errdetail_internal("%s", GUC_check_errdetail_string) : 0,
6664 : GUC_check_errhint_string ?
6665 : errhint("%s", GUC_check_errhint_string) : 0));
6666 : /* Flush strings created in ErrorContext (ereport might not have) */
6667 0 : FlushErrorState();
6668 0 : return false;
6669 : }
6670 :
6671 38318 : return true;
6672 : }
6673 :
6674 : static bool
6675 466282 : call_int_check_hook(const struct config_generic *conf, int *newval, void **extra,
6676 : GucSource source, int elevel)
6677 : {
6678 : /* Quick success if no hook */
6679 466282 : if (!conf->_int.check_hook)
6680 407070 : return true;
6681 :
6682 : /* Reset variables that might be set by hook */
6683 59212 : GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
6684 59212 : GUC_check_errmsg_string = NULL;
6685 59212 : GUC_check_errdetail_string = NULL;
6686 59212 : GUC_check_errhint_string = NULL;
6687 :
6688 59212 : if (!conf->_int.check_hook(newval, extra, source))
6689 : {
6690 0 : ereport(elevel,
6691 : (errcode(GUC_check_errcode_value),
6692 : GUC_check_errmsg_string ?
6693 : errmsg_internal("%s", GUC_check_errmsg_string) :
6694 : errmsg("invalid value for parameter \"%s\": %d",
6695 : conf->name, *newval),
6696 : GUC_check_errdetail_string ?
6697 : errdetail_internal("%s", GUC_check_errdetail_string) : 0,
6698 : GUC_check_errhint_string ?
6699 : errhint("%s", GUC_check_errhint_string) : 0));
6700 : /* Flush strings created in ErrorContext (ereport might not have) */
6701 0 : FlushErrorState();
6702 0 : return false;
6703 : }
6704 :
6705 59212 : return true;
6706 : }
6707 :
6708 : static bool
6709 70152 : call_real_check_hook(const struct config_generic *conf, double *newval, void **extra,
6710 : GucSource source, int elevel)
6711 : {
6712 : /* Quick success if no hook */
6713 70152 : if (!conf->_real.check_hook)
6714 67870 : return true;
6715 :
6716 : /* Reset variables that might be set by hook */
6717 2282 : GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
6718 2282 : GUC_check_errmsg_string = NULL;
6719 2282 : GUC_check_errdetail_string = NULL;
6720 2282 : GUC_check_errhint_string = NULL;
6721 :
6722 2282 : if (!conf->_real.check_hook(newval, extra, source))
6723 : {
6724 0 : ereport(elevel,
6725 : (errcode(GUC_check_errcode_value),
6726 : GUC_check_errmsg_string ?
6727 : errmsg_internal("%s", GUC_check_errmsg_string) :
6728 : errmsg("invalid value for parameter \"%s\": %g",
6729 : conf->name, *newval),
6730 : GUC_check_errdetail_string ?
6731 : errdetail_internal("%s", GUC_check_errdetail_string) : 0,
6732 : GUC_check_errhint_string ?
6733 : errhint("%s", GUC_check_errhint_string) : 0));
6734 : /* Flush strings created in ErrorContext (ereport might not have) */
6735 0 : FlushErrorState();
6736 0 : return false;
6737 : }
6738 :
6739 2282 : return true;
6740 : }
6741 :
6742 : static bool
6743 890302 : call_string_check_hook(const struct config_generic *conf, char **newval, void **extra,
6744 : GucSource source, int elevel)
6745 : {
6746 890302 : volatile bool result = true;
6747 :
6748 : /* Quick success if no hook */
6749 890302 : if (!conf->_string.check_hook)
6750 149888 : return true;
6751 :
6752 : /*
6753 : * If elevel is ERROR, or if the check_hook itself throws an elog
6754 : * (undesirable, but not always avoidable), make sure we don't leak the
6755 : * already-malloc'd newval string.
6756 : */
6757 740414 : PG_TRY();
6758 : {
6759 : /* Reset variables that might be set by hook */
6760 740414 : GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
6761 740414 : GUC_check_errmsg_string = NULL;
6762 740414 : GUC_check_errdetail_string = NULL;
6763 740414 : GUC_check_errhint_string = NULL;
6764 :
6765 740414 : if (!conf->_string.check_hook(newval, extra, source))
6766 : {
6767 46 : ereport(elevel,
6768 : (errcode(GUC_check_errcode_value),
6769 : GUC_check_errmsg_string ?
6770 : errmsg_internal("%s", GUC_check_errmsg_string) :
6771 : errmsg("invalid value for parameter \"%s\": \"%s\"",
6772 : conf->name, *newval ? *newval : ""),
6773 : GUC_check_errdetail_string ?
6774 : errdetail_internal("%s", GUC_check_errdetail_string) : 0,
6775 : GUC_check_errhint_string ?
6776 : errhint("%s", GUC_check_errhint_string) : 0));
6777 : /* Flush strings created in ErrorContext (ereport might not have) */
6778 6 : FlushErrorState();
6779 6 : result = false;
6780 : }
6781 : }
6782 46 : PG_CATCH();
6783 : {
6784 46 : guc_free(*newval);
6785 46 : PG_RE_THROW();
6786 : }
6787 740368 : PG_END_TRY();
6788 :
6789 740368 : return result;
6790 : }
6791 :
6792 : static bool
6793 179326 : call_enum_check_hook(const struct config_generic *conf, int *newval, void **extra,
6794 : GucSource source, int elevel)
6795 : {
6796 : /* Quick success if no hook */
6797 179326 : if (!conf->_enum.check_hook)
6798 159728 : return true;
6799 :
6800 : /* Reset variables that might be set by hook */
6801 19598 : GUC_check_errcode_value = ERRCODE_INVALID_PARAMETER_VALUE;
6802 19598 : GUC_check_errmsg_string = NULL;
6803 19598 : GUC_check_errdetail_string = NULL;
6804 19598 : GUC_check_errhint_string = NULL;
6805 :
6806 19598 : if (!conf->_enum.check_hook(newval, extra, source))
6807 : {
6808 2 : ereport(elevel,
6809 : (errcode(GUC_check_errcode_value),
6810 : GUC_check_errmsg_string ?
6811 : errmsg_internal("%s", GUC_check_errmsg_string) :
6812 : errmsg("invalid value for parameter \"%s\": \"%s\"",
6813 : conf->name,
6814 : config_enum_lookup_by_value(conf, *newval)),
6815 : GUC_check_errdetail_string ?
6816 : errdetail_internal("%s", GUC_check_errdetail_string) : 0,
6817 : GUC_check_errhint_string ?
6818 : errhint("%s", GUC_check_errhint_string) : 0));
6819 : /* Flush strings created in ErrorContext (ereport might not have) */
6820 0 : FlushErrorState();
6821 0 : return false;
6822 : }
6823 :
6824 19596 : return true;
6825 : }
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