Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * postinit.c
4 : * postgres initialization utilities
5 : *
6 : * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
7 : * Portions Copyright (c) 1994, Regents of the University of California
8 : *
9 : *
10 : * IDENTIFICATION
11 : * src/backend/utils/init/postinit.c
12 : *
13 : *
14 : *-------------------------------------------------------------------------
15 : */
16 : #include "postgres.h"
17 :
18 : #include <ctype.h>
19 : #include <fcntl.h>
20 : #include <unistd.h>
21 :
22 : #include "access/genam.h"
23 : #include "access/heapam.h"
24 : #include "access/htup_details.h"
25 : #include "access/session.h"
26 : #include "access/tableam.h"
27 : #include "access/xact.h"
28 : #include "access/xlog.h"
29 : #include "access/xloginsert.h"
30 : #include "catalog/namespace.h"
31 : #include "catalog/pg_authid.h"
32 : #include "catalog/pg_collation.h"
33 : #include "catalog/pg_database.h"
34 : #include "catalog/pg_db_role_setting.h"
35 : #include "catalog/pg_tablespace.h"
36 : #include "libpq/auth.h"
37 : #include "libpq/libpq-be.h"
38 : #include "mb/pg_wchar.h"
39 : #include "miscadmin.h"
40 : #include "pgstat.h"
41 : #include "postmaster/autovacuum.h"
42 : #include "postmaster/postmaster.h"
43 : #include "replication/slot.h"
44 : #include "replication/slotsync.h"
45 : #include "replication/walsender.h"
46 : #include "storage/aio_subsys.h"
47 : #include "storage/bufmgr.h"
48 : #include "storage/fd.h"
49 : #include "storage/ipc.h"
50 : #include "storage/lmgr.h"
51 : #include "storage/proc.h"
52 : #include "storage/procarray.h"
53 : #include "storage/procnumber.h"
54 : #include "storage/procsignal.h"
55 : #include "storage/sinvaladt.h"
56 : #include "storage/smgr.h"
57 : #include "storage/sync.h"
58 : #include "tcop/backend_startup.h"
59 : #include "tcop/tcopprot.h"
60 : #include "utils/acl.h"
61 : #include "utils/builtins.h"
62 : #include "utils/fmgroids.h"
63 : #include "utils/guc_hooks.h"
64 : #include "utils/injection_point.h"
65 : #include "utils/memutils.h"
66 : #include "utils/pg_locale.h"
67 : #include "utils/portal.h"
68 : #include "utils/ps_status.h"
69 : #include "utils/snapmgr.h"
70 : #include "utils/syscache.h"
71 : #include "utils/timeout.h"
72 :
73 : static HeapTuple GetDatabaseTuple(const char *dbname);
74 : static HeapTuple GetDatabaseTupleByOid(Oid dboid);
75 : static void PerformAuthentication(Port *port);
76 : static void CheckMyDatabase(const char *name, bool am_superuser, bool override_allow_connections);
77 : static void ShutdownPostgres(int code, Datum arg);
78 : static void StatementTimeoutHandler(void);
79 : static void LockTimeoutHandler(void);
80 : static void IdleInTransactionSessionTimeoutHandler(void);
81 : static void TransactionTimeoutHandler(void);
82 : static void IdleSessionTimeoutHandler(void);
83 : static void IdleStatsUpdateTimeoutHandler(void);
84 : static void ClientCheckTimeoutHandler(void);
85 : static bool ThereIsAtLeastOneRole(void);
86 : static void process_startup_options(Port *port, bool am_superuser);
87 : static void process_settings(Oid databaseid, Oid roleid);
88 :
89 :
90 : /*** InitPostgres support ***/
91 :
92 :
93 : /*
94 : * GetDatabaseTuple -- fetch the pg_database row for a database
95 : *
96 : * This is used during backend startup when we don't yet have any access to
97 : * system catalogs in general. In the worst case, we can seqscan pg_database
98 : * using nothing but the hard-wired descriptor that relcache.c creates for
99 : * pg_database. In more typical cases, relcache.c was able to load
100 : * descriptors for both pg_database and its indexes from the shared relcache
101 : * cache file, and so we can do an indexscan. criticalSharedRelcachesBuilt
102 : * tells whether we got the cached descriptors.
103 : */
104 : static HeapTuple
105 25998 : GetDatabaseTuple(const char *dbname)
106 : {
107 : HeapTuple tuple;
108 : Relation relation;
109 : SysScanDesc scan;
110 : ScanKeyData key[1];
111 :
112 : /*
113 : * form a scan key
114 : */
115 25998 : ScanKeyInit(&key[0],
116 : Anum_pg_database_datname,
117 : BTEqualStrategyNumber, F_NAMEEQ,
118 : CStringGetDatum(dbname));
119 :
120 : /*
121 : * Open pg_database and fetch a tuple. Force heap scan if we haven't yet
122 : * built the critical shared relcache entries (i.e., we're starting up
123 : * without a shared relcache cache file).
124 : */
125 25998 : relation = table_open(DatabaseRelationId, AccessShareLock);
126 25998 : scan = systable_beginscan(relation, DatabaseNameIndexId,
127 : criticalSharedRelcachesBuilt,
128 : NULL,
129 : 1, key);
130 :
131 25998 : tuple = systable_getnext(scan);
132 :
133 : /* Must copy tuple before releasing buffer */
134 25998 : if (HeapTupleIsValid(tuple))
135 25980 : tuple = heap_copytuple(tuple);
136 :
137 : /* all done */
138 25998 : systable_endscan(scan);
139 25998 : table_close(relation, AccessShareLock);
140 :
141 25998 : return tuple;
142 : }
143 :
144 : /*
145 : * GetDatabaseTupleByOid -- as above, but search by database OID
146 : */
147 : static HeapTuple
148 31940 : GetDatabaseTupleByOid(Oid dboid)
149 : {
150 : HeapTuple tuple;
151 : Relation relation;
152 : SysScanDesc scan;
153 : ScanKeyData key[1];
154 :
155 : /*
156 : * form a scan key
157 : */
158 31940 : ScanKeyInit(&key[0],
159 : Anum_pg_database_oid,
160 : BTEqualStrategyNumber, F_OIDEQ,
161 : ObjectIdGetDatum(dboid));
162 :
163 : /*
164 : * Open pg_database and fetch a tuple. Force heap scan if we haven't yet
165 : * built the critical shared relcache entries (i.e., we're starting up
166 : * without a shared relcache cache file).
167 : */
168 31940 : relation = table_open(DatabaseRelationId, AccessShareLock);
169 31940 : scan = systable_beginscan(relation, DatabaseOidIndexId,
170 : criticalSharedRelcachesBuilt,
171 : NULL,
172 : 1, key);
173 :
174 31940 : tuple = systable_getnext(scan);
175 :
176 : /* Must copy tuple before releasing buffer */
177 31940 : if (HeapTupleIsValid(tuple))
178 31940 : tuple = heap_copytuple(tuple);
179 :
180 : /* all done */
181 31940 : systable_endscan(scan);
182 31940 : table_close(relation, AccessShareLock);
183 :
184 31940 : return tuple;
185 : }
186 :
187 :
188 : /*
189 : * PerformAuthentication -- authenticate a remote client
190 : *
191 : * returns: nothing. Will not return at all if there's any failure.
192 : */
193 : static void
194 26934 : PerformAuthentication(Port *port)
195 : {
196 : /* This should be set already, but let's make sure */
197 26934 : ClientAuthInProgress = true; /* limit visibility of log messages */
198 :
199 : /*
200 : * In EXEC_BACKEND case, we didn't inherit the contents of pg_hba.conf
201 : * etcetera from the postmaster, and have to load them ourselves.
202 : *
203 : * FIXME: [fork/exec] Ugh. Is there a way around this overhead?
204 : */
205 : #ifdef EXEC_BACKEND
206 :
207 : /*
208 : * load_hba() and load_ident() want to work within the PostmasterContext,
209 : * so create that if it doesn't exist (which it won't). We'll delete it
210 : * again later, in PostgresMain.
211 : */
212 : if (PostmasterContext == NULL)
213 : PostmasterContext = AllocSetContextCreate(TopMemoryContext,
214 : "Postmaster",
215 : ALLOCSET_DEFAULT_SIZES);
216 :
217 : if (!load_hba())
218 : {
219 : /*
220 : * It makes no sense to continue if we fail to load the HBA file,
221 : * since there is no way to connect to the database in this case.
222 : */
223 : ereport(FATAL,
224 : /* translator: %s is a configuration file */
225 : (errmsg("could not load %s", HbaFileName)));
226 : }
227 :
228 : if (!load_ident())
229 : {
230 : /*
231 : * It is ok to continue if we fail to load the IDENT file, although it
232 : * means that you cannot log in using any of the authentication
233 : * methods that need a user name mapping. load_ident() already logged
234 : * the details of error to the log.
235 : */
236 : }
237 : #endif
238 :
239 : /* Capture authentication start time for logging */
240 26934 : conn_timing.auth_start = GetCurrentTimestamp();
241 :
242 : /*
243 : * Set up a timeout in case a buggy or malicious client fails to respond
244 : * during authentication. Since we're inside a transaction and might do
245 : * database access, we have to use the statement_timeout infrastructure.
246 : */
247 26934 : enable_timeout_after(STATEMENT_TIMEOUT, AuthenticationTimeout * 1000);
248 :
249 : /*
250 : * Now perform authentication exchange.
251 : */
252 26934 : set_ps_display("authentication");
253 26934 : ClientAuthentication(port); /* might not return, if failure */
254 :
255 : /*
256 : * Done with authentication. Disable the timeout, and log if needed.
257 : */
258 26800 : disable_timeout(STATEMENT_TIMEOUT, false);
259 :
260 : /* Capture authentication end time for logging */
261 26800 : conn_timing.auth_end = GetCurrentTimestamp();
262 :
263 26800 : if (log_connections & LOG_CONNECTION_AUTHORIZATION)
264 : {
265 : StringInfoData logmsg;
266 :
267 624 : initStringInfo(&logmsg);
268 624 : if (am_walsender)
269 6 : appendStringInfo(&logmsg, _("replication connection authorized: user=%s"),
270 : port->user_name);
271 : else
272 618 : appendStringInfo(&logmsg, _("connection authorized: user=%s"),
273 : port->user_name);
274 624 : if (!am_walsender)
275 618 : appendStringInfo(&logmsg, _(" database=%s"), port->database_name);
276 :
277 624 : if (port->application_name != NULL)
278 624 : appendStringInfo(&logmsg, _(" application_name=%s"),
279 : port->application_name);
280 :
281 : #ifdef USE_SSL
282 624 : if (port->ssl_in_use)
283 170 : appendStringInfo(&logmsg, _(" SSL enabled (protocol=%s, cipher=%s, bits=%d)"),
284 : be_tls_get_version(port),
285 : be_tls_get_cipher(port),
286 : be_tls_get_cipher_bits(port));
287 : #endif
288 : #ifdef ENABLE_GSS
289 : if (port->gss)
290 : {
291 : const char *princ = be_gssapi_get_princ(port);
292 :
293 : if (princ)
294 : appendStringInfo(&logmsg,
295 : _(" GSS (authenticated=%s, encrypted=%s, delegated_credentials=%s, principal=%s)"),
296 : be_gssapi_get_auth(port) ? _("yes") : _("no"),
297 : be_gssapi_get_enc(port) ? _("yes") : _("no"),
298 : be_gssapi_get_delegation(port) ? _("yes") : _("no"),
299 : princ);
300 : else
301 : appendStringInfo(&logmsg,
302 : _(" GSS (authenticated=%s, encrypted=%s, delegated_credentials=%s)"),
303 : be_gssapi_get_auth(port) ? _("yes") : _("no"),
304 : be_gssapi_get_enc(port) ? _("yes") : _("no"),
305 : be_gssapi_get_delegation(port) ? _("yes") : _("no"));
306 : }
307 : #endif
308 :
309 624 : ereport(LOG, errmsg_internal("%s", logmsg.data));
310 624 : pfree(logmsg.data);
311 : }
312 :
313 26800 : set_ps_display("startup");
314 :
315 26800 : ClientAuthInProgress = false; /* client_min_messages is active now */
316 26800 : }
317 :
318 :
319 : /*
320 : * CheckMyDatabase -- fetch information from the pg_database entry for our DB
321 : */
322 : static void
323 31924 : CheckMyDatabase(const char *name, bool am_superuser, bool override_allow_connections)
324 : {
325 : HeapTuple tup;
326 : Form_pg_database dbform;
327 : Datum datum;
328 : bool isnull;
329 : char *collate;
330 : char *ctype;
331 :
332 : /* Fetch our pg_database row normally, via syscache */
333 31924 : tup = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(MyDatabaseId));
334 31924 : if (!HeapTupleIsValid(tup))
335 0 : elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
336 31924 : dbform = (Form_pg_database) GETSTRUCT(tup);
337 :
338 : /* This recheck is strictly paranoia */
339 31924 : if (strcmp(name, NameStr(dbform->datname)) != 0)
340 0 : ereport(FATAL,
341 : (errcode(ERRCODE_UNDEFINED_DATABASE),
342 : errmsg("database \"%s\" has disappeared from pg_database",
343 : name),
344 : errdetail("Database OID %u now seems to belong to \"%s\".",
345 : MyDatabaseId, NameStr(dbform->datname))));
346 :
347 : /*
348 : * Check permissions to connect to the database.
349 : *
350 : * These checks are not enforced when in standalone mode, so that there is
351 : * a way to recover from disabling all access to all databases, for
352 : * example "UPDATE pg_database SET datallowconn = false;".
353 : */
354 31924 : if (IsUnderPostmaster)
355 : {
356 : /*
357 : * Check that the database is currently allowing connections.
358 : * (Background processes can override this test and the next one by
359 : * setting override_allow_connections.)
360 : */
361 31816 : if (!dbform->datallowconn && !override_allow_connections)
362 2 : ereport(FATAL,
363 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
364 : errmsg("database \"%s\" is not currently accepting connections",
365 : name)));
366 :
367 : /*
368 : * Check privilege to connect to the database. (The am_superuser test
369 : * is redundant, but since we have the flag, might as well check it
370 : * and save a few cycles.)
371 : */
372 32340 : if (!am_superuser && !override_allow_connections &&
373 526 : object_aclcheck(DatabaseRelationId, MyDatabaseId, GetUserId(),
374 : ACL_CONNECT) != ACLCHECK_OK)
375 0 : ereport(FATAL,
376 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
377 : errmsg("permission denied for database \"%s\"", name),
378 : errdetail("User does not have CONNECT privilege.")));
379 :
380 : /*
381 : * Check connection limit for this database. We enforce the limit
382 : * only for regular backends, since other process types have their own
383 : * PGPROC pools.
384 : *
385 : * There is a race condition here --- we create our PGPROC before
386 : * checking for other PGPROCs. If two backends did this at about the
387 : * same time, they might both think they were over the limit, while
388 : * ideally one should succeed and one fail. Getting that to work
389 : * exactly seems more trouble than it is worth, however; instead we
390 : * just document that the connection limit is approximate.
391 : */
392 31814 : if (dbform->datconnlimit >= 0 &&
393 0 : AmRegularBackendProcess() &&
394 0 : !am_superuser &&
395 0 : CountDBConnections(MyDatabaseId) > dbform->datconnlimit)
396 0 : ereport(FATAL,
397 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
398 : errmsg("too many connections for database \"%s\"",
399 : name)));
400 : }
401 :
402 : /*
403 : * OK, we're golden. Next to-do item is to save the encoding info out of
404 : * the pg_database tuple.
405 : */
406 31922 : SetDatabaseEncoding(dbform->encoding);
407 : /* Record it as a GUC internal option, too */
408 31922 : SetConfigOption("server_encoding", GetDatabaseEncodingName(),
409 : PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
410 : /* If we have no other source of client_encoding, use server encoding */
411 31922 : SetConfigOption("client_encoding", GetDatabaseEncodingName(),
412 : PGC_BACKEND, PGC_S_DYNAMIC_DEFAULT);
413 :
414 : /* assign locale variables */
415 31922 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datcollate);
416 31922 : collate = TextDatumGetCString(datum);
417 31922 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datctype);
418 31922 : ctype = TextDatumGetCString(datum);
419 :
420 31922 : if (pg_perm_setlocale(LC_COLLATE, collate) == NULL)
421 0 : ereport(FATAL,
422 : (errmsg("database locale is incompatible with operating system"),
423 : errdetail("The database was initialized with LC_COLLATE \"%s\", "
424 : " which is not recognized by setlocale().", collate),
425 : errhint("Recreate the database with another locale or install the missing locale.")));
426 :
427 31922 : if (pg_perm_setlocale(LC_CTYPE, ctype) == NULL)
428 0 : ereport(FATAL,
429 : (errmsg("database locale is incompatible with operating system"),
430 : errdetail("The database was initialized with LC_CTYPE \"%s\", "
431 : " which is not recognized by setlocale().", ctype),
432 : errhint("Recreate the database with another locale or install the missing locale.")));
433 :
434 31922 : if (strcmp(ctype, "C") == 0 ||
435 29110 : strcmp(ctype, "POSIX") == 0)
436 2812 : database_ctype_is_c = true;
437 :
438 31922 : init_database_collation();
439 :
440 : /*
441 : * Check collation version. See similar code in
442 : * pg_newlocale_from_collation(). Note that here we warn instead of error
443 : * in any case, so that we don't prevent connecting.
444 : */
445 31918 : datum = SysCacheGetAttr(DATABASEOID, tup, Anum_pg_database_datcollversion,
446 : &isnull);
447 31918 : if (!isnull)
448 : {
449 : char *actual_versionstr;
450 : char *collversionstr;
451 : char *locale;
452 :
453 30156 : collversionstr = TextDatumGetCString(datum);
454 :
455 30156 : if (dbform->datlocprovider == COLLPROVIDER_LIBC)
456 28446 : locale = collate;
457 : else
458 : {
459 1710 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datlocale);
460 1710 : locale = TextDatumGetCString(datum);
461 : }
462 :
463 30156 : actual_versionstr = get_collation_actual_version(dbform->datlocprovider, locale);
464 30156 : if (!actual_versionstr)
465 : /* should not happen */
466 0 : elog(WARNING,
467 : "database \"%s\" has no actual collation version, but a version was recorded",
468 : name);
469 30156 : else if (strcmp(actual_versionstr, collversionstr) != 0)
470 0 : ereport(WARNING,
471 : (errmsg("database \"%s\" has a collation version mismatch",
472 : name),
473 : errdetail("The database was created using collation version %s, "
474 : "but the operating system provides version %s.",
475 : collversionstr, actual_versionstr),
476 : errhint("Rebuild all objects in this database that use the default collation and run "
477 : "ALTER DATABASE %s REFRESH COLLATION VERSION, "
478 : "or build PostgreSQL with the right library version.",
479 : quote_identifier(name))));
480 : }
481 :
482 31918 : ReleaseSysCache(tup);
483 31918 : }
484 :
485 :
486 : /*
487 : * pg_split_opts -- split a string of options and append it to an argv array
488 : *
489 : * The caller is responsible for ensuring the argv array is large enough. The
490 : * maximum possible number of arguments added by this routine is
491 : * (strlen(optstr) + 1) / 2.
492 : *
493 : * Because some option values can contain spaces we allow escaping using
494 : * backslashes, with \\ representing a literal backslash.
495 : */
496 : void
497 7016 : pg_split_opts(char **argv, int *argcp, const char *optstr)
498 : {
499 : StringInfoData s;
500 :
501 7016 : initStringInfo(&s);
502 :
503 25596 : while (*optstr)
504 : {
505 18580 : bool last_was_escape = false;
506 :
507 18580 : resetStringInfo(&s);
508 :
509 : /* skip over leading space */
510 34448 : while (isspace((unsigned char) *optstr))
511 15868 : optstr++;
512 :
513 18580 : if (*optstr == '\0')
514 0 : break;
515 :
516 : /*
517 : * Parse a single option, stopping at the first space, unless it's
518 : * escaped.
519 : */
520 283944 : while (*optstr)
521 : {
522 276928 : if (isspace((unsigned char) *optstr) && !last_was_escape)
523 11564 : break;
524 :
525 265364 : if (!last_was_escape && *optstr == '\\')
526 28 : last_was_escape = true;
527 : else
528 : {
529 265336 : last_was_escape = false;
530 265336 : appendStringInfoChar(&s, *optstr);
531 : }
532 :
533 265364 : optstr++;
534 : }
535 :
536 : /* now store the option in the next argv[] position */
537 18580 : argv[(*argcp)++] = pstrdup(s.data);
538 : }
539 :
540 7016 : pfree(s.data);
541 7016 : }
542 :
543 : /*
544 : * Initialize MaxBackends value from config options.
545 : *
546 : * This must be called after modules have had the chance to alter GUCs in
547 : * shared_preload_libraries and before shared memory size is determined.
548 : *
549 : * Note that in EXEC_BACKEND environment, the value is passed down from
550 : * postmaster to subprocesses via BackendParameters in SubPostmasterMain; only
551 : * postmaster itself and processes not under postmaster control should call
552 : * this.
553 : */
554 : void
555 2028 : InitializeMaxBackends(void)
556 : {
557 : Assert(MaxBackends == 0);
558 :
559 : /* Note that this does not include "auxiliary" processes */
560 2028 : MaxBackends = MaxConnections + autovacuum_worker_slots +
561 2028 : max_worker_processes + max_wal_senders + NUM_SPECIAL_WORKER_PROCS;
562 :
563 2028 : if (MaxBackends > MAX_BACKENDS)
564 0 : ereport(ERROR,
565 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
566 : errmsg("too many server processes configured"),
567 : errdetail("\"max_connections\" (%d) plus \"autovacuum_worker_slots\" (%d) plus \"max_worker_processes\" (%d) plus \"max_wal_senders\" (%d) must be less than %d.",
568 : MaxConnections, autovacuum_worker_slots,
569 : max_worker_processes, max_wal_senders,
570 : MAX_BACKENDS - (NUM_SPECIAL_WORKER_PROCS - 1))));
571 2028 : }
572 :
573 : /*
574 : * Initialize the number of fast-path lock slots in PGPROC.
575 : *
576 : * This must be called after modules have had the chance to alter GUCs in
577 : * shared_preload_libraries and before shared memory size is determined.
578 : *
579 : * The default max_locks_per_xact=64 means 4 groups by default.
580 : *
581 : * We allow anything between 1 and 1024 groups, with the usual power-of-2
582 : * logic. The 1 is the "old" size with only 16 slots, 1024 is an arbitrary
583 : * limit (matching max_locks_per_xact = 16k). Values over 1024 are unlikely
584 : * to be beneficial - there are bottlenecks we'll hit way before that.
585 : */
586 : void
587 2028 : InitializeFastPathLocks(void)
588 : {
589 : /* Should be initialized only once. */
590 : Assert(FastPathLockGroupsPerBackend == 0);
591 :
592 : /* we need at least one group */
593 2028 : FastPathLockGroupsPerBackend = 1;
594 :
595 6084 : while (FastPathLockGroupsPerBackend < FP_LOCK_GROUPS_PER_BACKEND_MAX)
596 : {
597 : /* stop once we exceed max_locks_per_xact */
598 6084 : if (FastPathLockSlotsPerBackend() >= max_locks_per_xact)
599 2028 : break;
600 :
601 4056 : FastPathLockGroupsPerBackend *= 2;
602 : }
603 :
604 : Assert(FastPathLockGroupsPerBackend <= FP_LOCK_GROUPS_PER_BACKEND_MAX);
605 2028 : }
606 :
607 : /*
608 : * Early initialization of a backend (either standalone or under postmaster).
609 : * This happens even before InitPostgres.
610 : *
611 : * This is separate from InitPostgres because it is also called by auxiliary
612 : * processes, such as the background writer process, which may not call
613 : * InitPostgres at all.
614 : */
615 : void
616 42486 : BaseInit(void)
617 : {
618 : Assert(MyProc != NULL);
619 :
620 : /*
621 : * Initialize our input/output/debugging file descriptors.
622 : */
623 42486 : DebugFileOpen();
624 :
625 : /*
626 : * Initialize file access. Done early so other subsystems can access
627 : * files.
628 : */
629 42486 : InitFileAccess();
630 :
631 : /*
632 : * Initialize statistics reporting. This needs to happen early to ensure
633 : * that pgstat's shutdown callback runs after the shutdown callbacks of
634 : * all subsystems that can produce stats (like e.g. transaction commits
635 : * can).
636 : */
637 42486 : pgstat_initialize();
638 :
639 : /*
640 : * Initialize AIO before infrastructure that might need to actually
641 : * execute AIO.
642 : */
643 42486 : pgaio_init_backend();
644 :
645 : /* Do local initialization of storage and buffer managers */
646 42486 : InitSync();
647 42486 : smgrinit();
648 42486 : InitBufferManagerAccess();
649 :
650 : /*
651 : * Initialize temporary file access after pgstat, so that the temporary
652 : * file shutdown hook can report temporary file statistics.
653 : */
654 42486 : InitTemporaryFileAccess();
655 :
656 : /*
657 : * Initialize local buffers for WAL record construction, in case we ever
658 : * try to insert XLOG.
659 : */
660 42486 : InitXLogInsert();
661 :
662 : /* Initialize lock manager's local structs */
663 42486 : InitLockManagerAccess();
664 :
665 : /*
666 : * Initialize replication slots after pgstat. The exit hook might need to
667 : * drop ephemeral slots, which in turn triggers stats reporting.
668 : */
669 42486 : ReplicationSlotInitialize();
670 42486 : }
671 :
672 :
673 : /* --------------------------------
674 : * InitPostgres
675 : * Initialize POSTGRES.
676 : *
677 : * Parameters:
678 : * in_dbname, dboid: specify database to connect to, as described below
679 : * username, useroid: specify role to connect as, as described below
680 : * flags:
681 : * - INIT_PG_LOAD_SESSION_LIBS to honor [session|local]_preload_libraries.
682 : * - INIT_PG_OVERRIDE_ALLOW_CONNS to connect despite !datallowconn.
683 : * - INIT_PG_OVERRIDE_ROLE_LOGIN to connect despite !rolcanlogin.
684 : * out_dbname: optional output parameter, see below; pass NULL if not used
685 : *
686 : * The database can be specified by name, using the in_dbname parameter, or by
687 : * OID, using the dboid parameter. Specify NULL or InvalidOid respectively
688 : * for the unused parameter. If dboid is provided, the actual database
689 : * name can be returned to the caller in out_dbname. If out_dbname isn't
690 : * NULL, it must point to a buffer of size NAMEDATALEN.
691 : *
692 : * Similarly, the role can be passed by name, using the username parameter,
693 : * or by OID using the useroid parameter.
694 : *
695 : * In bootstrap mode the database and username parameters are NULL/InvalidOid.
696 : * The autovacuum launcher process doesn't specify these parameters either,
697 : * because it only goes far enough to be able to read pg_database; it doesn't
698 : * connect to any particular database. An autovacuum worker specifies a
699 : * database but not a username; conversely, a physical walsender specifies
700 : * username but not database.
701 : *
702 : * By convention, INIT_PG_LOAD_SESSION_LIBS should be passed in "flags" in
703 : * "interactive" sessions (including standalone backends), but not in
704 : * background processes such as autovacuum. Note in particular that it
705 : * shouldn't be true in parallel worker processes; those have another
706 : * mechanism for replicating their leader's set of loaded libraries.
707 : *
708 : * We expect that InitProcess() was already called, so we already have a
709 : * PGPROC struct ... but it's not completely filled in yet.
710 : *
711 : * Note:
712 : * Be very careful with the order of calls in the InitPostgres function.
713 : * --------------------------------
714 : */
715 : void
716 34610 : InitPostgres(const char *in_dbname, Oid dboid,
717 : const char *username, Oid useroid,
718 : bits32 flags,
719 : char *out_dbname)
720 : {
721 34610 : bool bootstrap = IsBootstrapProcessingMode();
722 : bool am_superuser;
723 : char *fullpath;
724 : char dbname[NAMEDATALEN];
725 34610 : int nfree = 0;
726 :
727 34610 : elog(DEBUG3, "InitPostgres");
728 :
729 : /*
730 : * Add my PGPROC struct to the ProcArray.
731 : *
732 : * Once I have done this, I am visible to other backends!
733 : */
734 34610 : InitProcessPhase2();
735 :
736 : /* Initialize status reporting */
737 34610 : pgstat_beinit();
738 :
739 : /*
740 : * And initialize an entry in the PgBackendStatus array. That way, if
741 : * LWLocks or third-party authentication should happen to hang, it is
742 : * possible to retrieve some information about what is going on.
743 : */
744 34610 : if (!bootstrap)
745 : {
746 34520 : pgstat_bestart_initial();
747 34520 : INJECTION_POINT("init-pre-auth");
748 : }
749 :
750 : /*
751 : * Initialize my entry in the shared-invalidation manager's array of
752 : * per-backend data.
753 : */
754 34610 : SharedInvalBackendInit(false);
755 :
756 34610 : ProcSignalInit(MyCancelKeyValid, MyCancelKey);
757 :
758 : /*
759 : * Also set up timeout handlers needed for backend operation. We need
760 : * these in every case except bootstrap.
761 : */
762 34610 : if (!bootstrap)
763 : {
764 34520 : RegisterTimeout(DEADLOCK_TIMEOUT, CheckDeadLockAlert);
765 34520 : RegisterTimeout(STATEMENT_TIMEOUT, StatementTimeoutHandler);
766 34520 : RegisterTimeout(LOCK_TIMEOUT, LockTimeoutHandler);
767 34520 : RegisterTimeout(IDLE_IN_TRANSACTION_SESSION_TIMEOUT,
768 : IdleInTransactionSessionTimeoutHandler);
769 34520 : RegisterTimeout(TRANSACTION_TIMEOUT, TransactionTimeoutHandler);
770 34520 : RegisterTimeout(IDLE_SESSION_TIMEOUT, IdleSessionTimeoutHandler);
771 34520 : RegisterTimeout(CLIENT_CONNECTION_CHECK_TIMEOUT, ClientCheckTimeoutHandler);
772 34520 : RegisterTimeout(IDLE_STATS_UPDATE_TIMEOUT,
773 : IdleStatsUpdateTimeoutHandler);
774 : }
775 :
776 : /*
777 : * If this is either a bootstrap process or a standalone backend, start up
778 : * the XLOG machinery, and register to have it closed down at exit. In
779 : * other cases, the startup process is responsible for starting up the
780 : * XLOG machinery, and the checkpointer for closing it down.
781 : */
782 34610 : if (!IsUnderPostmaster)
783 : {
784 : /*
785 : * We don't yet have an aux-process resource owner, but StartupXLOG
786 : * and ShutdownXLOG will need one. Hence, create said resource owner
787 : * (and register a callback to clean it up after ShutdownXLOG runs).
788 : */
789 198 : CreateAuxProcessResourceOwner();
790 :
791 198 : StartupXLOG();
792 : /* Release (and warn about) any buffer pins leaked in StartupXLOG */
793 198 : ReleaseAuxProcessResources(true);
794 : /* Reset CurrentResourceOwner to nothing for the moment */
795 198 : CurrentResourceOwner = NULL;
796 :
797 : /*
798 : * Use before_shmem_exit() so that ShutdownXLOG() can rely on DSM
799 : * segments etc to work (which in turn is required for pgstats).
800 : */
801 198 : before_shmem_exit(pgstat_before_server_shutdown, 0);
802 198 : before_shmem_exit(ShutdownXLOG, 0);
803 : }
804 :
805 : /*
806 : * Initialize the relation cache and the system catalog caches. Note that
807 : * no catalog access happens here; we only set up the hashtable structure.
808 : * We must do this before starting a transaction because transaction abort
809 : * would try to touch these hashtables.
810 : */
811 34610 : RelationCacheInitialize();
812 34610 : InitCatalogCache();
813 34610 : InitPlanCache();
814 :
815 : /* Initialize portal manager */
816 34610 : EnablePortalManager();
817 :
818 : /*
819 : * Load relcache entries for the shared system catalogs. This must create
820 : * at least entries for pg_database and catalogs used for authentication.
821 : */
822 34610 : RelationCacheInitializePhase2();
823 :
824 : /*
825 : * Set up process-exit callback to do pre-shutdown cleanup. This is the
826 : * one of the first before_shmem_exit callbacks we register; thus, this
827 : * will be one the last things we do before low-level modules like the
828 : * buffer manager begin to close down. We need to have this in place
829 : * before we begin our first transaction --- if we fail during the
830 : * initialization transaction, as is entirely possible, we need the
831 : * AbortTransaction call to clean up.
832 : */
833 34610 : before_shmem_exit(ShutdownPostgres, 0);
834 :
835 : /* The autovacuum launcher is done here */
836 34610 : if (AmAutoVacuumLauncherProcess())
837 : {
838 : /* fill in the remainder of this entry in the PgBackendStatus array */
839 730 : pgstat_bestart_final();
840 :
841 2414 : return;
842 : }
843 :
844 : /*
845 : * Start a new transaction here before first access to db.
846 : */
847 33880 : if (!bootstrap)
848 : {
849 : /* statement_timestamp must be set for timeouts to work correctly */
850 33790 : SetCurrentStatementStartTimestamp();
851 33790 : StartTransactionCommand();
852 :
853 : /*
854 : * transaction_isolation will have been set to the default by the
855 : * above. If the default is "serializable", and we are in hot
856 : * standby, we will fail if we don't change it to something lower.
857 : * Fortunately, "read committed" is plenty good enough.
858 : */
859 33790 : XactIsoLevel = XACT_READ_COMMITTED;
860 : }
861 :
862 : /*
863 : * Perform client authentication if necessary, then figure out our
864 : * postgres user ID, and see if we are a superuser.
865 : *
866 : * In standalone mode, autovacuum worker processes and slot sync worker
867 : * process, we use a fixed ID, otherwise we figure it out from the
868 : * authenticated user name.
869 : */
870 33880 : if (bootstrap || AmAutoVacuumWorkerProcess() || AmLogicalSlotSyncWorkerProcess())
871 : {
872 2484 : InitializeSessionUserIdStandalone();
873 2484 : am_superuser = true;
874 : }
875 31396 : else if (!IsUnderPostmaster)
876 : {
877 108 : InitializeSessionUserIdStandalone();
878 108 : am_superuser = true;
879 108 : if (!ThereIsAtLeastOneRole())
880 0 : ereport(WARNING,
881 : (errcode(ERRCODE_UNDEFINED_OBJECT),
882 : errmsg("no roles are defined in this database system"),
883 : errhint("You should immediately run CREATE USER \"%s\" SUPERUSER;.",
884 : username != NULL ? username : "postgres")));
885 : }
886 31288 : else if (AmBackgroundWorkerProcess())
887 : {
888 4354 : if (username == NULL && !OidIsValid(useroid))
889 : {
890 782 : InitializeSessionUserIdStandalone();
891 782 : am_superuser = true;
892 : }
893 : else
894 : {
895 3572 : InitializeSessionUserId(username, useroid,
896 3572 : (flags & INIT_PG_OVERRIDE_ROLE_LOGIN) != 0);
897 3570 : am_superuser = superuser();
898 : }
899 : }
900 : else
901 : {
902 : /* normal multiuser case */
903 : Assert(MyProcPort != NULL);
904 26934 : PerformAuthentication(MyProcPort);
905 26800 : InitializeSessionUserId(username, useroid, false);
906 : /* ensure that auth_method is actually valid, aka authn_id is not NULL */
907 26792 : if (MyClientConnectionInfo.authn_id)
908 246 : InitializeSystemUser(MyClientConnectionInfo.authn_id,
909 : hba_authname(MyClientConnectionInfo.auth_method));
910 26792 : am_superuser = superuser();
911 : }
912 :
913 : /* Report any SSL/GSS details for the session. */
914 33736 : if (MyProcPort != NULL)
915 : {
916 : Assert(!bootstrap);
917 :
918 26792 : pgstat_bestart_security();
919 : }
920 :
921 : /*
922 : * Binary upgrades only allowed super-user connections
923 : */
924 33736 : if (IsBinaryUpgrade && !am_superuser)
925 : {
926 0 : ereport(FATAL,
927 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
928 : errmsg("must be superuser to connect in binary upgrade mode")));
929 : }
930 :
931 : /*
932 : * The last few regular connection slots are reserved for superusers and
933 : * roles with privileges of pg_use_reserved_connections. We do not apply
934 : * these limits to background processes, since they all have their own
935 : * pools of PGPROC slots.
936 : *
937 : * Note: At this point, the new backend has already claimed a proc struct,
938 : * so we must check whether the number of free slots is strictly less than
939 : * the reserved connection limits.
940 : */
941 33736 : if (AmRegularBackendProcess() && !am_superuser &&
942 482 : (SuperuserReservedConnections + ReservedConnections) > 0 &&
943 482 : !HaveNFreeProcs(SuperuserReservedConnections + ReservedConnections, &nfree))
944 : {
945 8 : if (nfree < SuperuserReservedConnections)
946 2 : ereport(FATAL,
947 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
948 : errmsg("remaining connection slots are reserved for roles with the %s attribute",
949 : "SUPERUSER")));
950 :
951 6 : if (!has_privs_of_role(GetUserId(), ROLE_PG_USE_RESERVED_CONNECTIONS))
952 2 : ereport(FATAL,
953 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
954 : errmsg("remaining connection slots are reserved for roles with privileges of the \"%s\" role",
955 : "pg_use_reserved_connections")));
956 : }
957 :
958 : /* Check replication permissions needed for walsender processes. */
959 33732 : if (am_walsender)
960 : {
961 : Assert(!bootstrap);
962 :
963 2204 : if (!has_rolreplication(GetUserId()))
964 0 : ereport(FATAL,
965 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
966 : errmsg("permission denied to start WAL sender"),
967 : errdetail("Only roles with the %s attribute may start a WAL sender process.",
968 : "REPLICATION")));
969 : }
970 :
971 : /*
972 : * If this is a plain walsender only supporting physical replication, we
973 : * don't want to connect to any particular database. Just finish the
974 : * backend startup by processing any options from the startup packet, and
975 : * we're done.
976 : */
977 33732 : if (am_walsender && !am_db_walsender)
978 : {
979 : /* process any options passed in the startup packet */
980 906 : if (MyProcPort != NULL)
981 906 : process_startup_options(MyProcPort, am_superuser);
982 :
983 : /* Apply PostAuthDelay as soon as we've read all options */
984 906 : if (PostAuthDelay > 0)
985 0 : pg_usleep(PostAuthDelay * 1000000L);
986 :
987 : /* initialize client encoding */
988 906 : InitializeClientEncoding();
989 :
990 : /* fill in the remainder of this entry in the PgBackendStatus array */
991 906 : pgstat_bestart_final();
992 :
993 : /* close the transaction we started above */
994 906 : CommitTransactionCommand();
995 :
996 906 : return;
997 : }
998 :
999 : /*
1000 : * Set up the global variables holding database id and default tablespace.
1001 : * But note we won't actually try to touch the database just yet.
1002 : *
1003 : * We take a shortcut in the bootstrap case, otherwise we have to look up
1004 : * the db's entry in pg_database.
1005 : */
1006 32826 : if (bootstrap)
1007 : {
1008 90 : dboid = Template1DbOid;
1009 90 : MyDatabaseTableSpace = DEFAULTTABLESPACE_OID;
1010 : }
1011 32736 : else if (in_dbname != NULL)
1012 : {
1013 : HeapTuple tuple;
1014 : Form_pg_database dbform;
1015 :
1016 25998 : tuple = GetDatabaseTuple(in_dbname);
1017 25998 : if (!HeapTupleIsValid(tuple))
1018 18 : ereport(FATAL,
1019 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1020 : errmsg("database \"%s\" does not exist", in_dbname)));
1021 25980 : dbform = (Form_pg_database) GETSTRUCT(tuple);
1022 25980 : dboid = dbform->oid;
1023 : }
1024 6738 : else if (!OidIsValid(dboid))
1025 : {
1026 : /*
1027 : * If this is a background worker not bound to any particular
1028 : * database, we're done now. Everything that follows only makes sense
1029 : * if we are bound to a specific database. We do need to close the
1030 : * transaction we started before returning.
1031 : */
1032 778 : if (!bootstrap)
1033 : {
1034 778 : pgstat_bestart_final();
1035 778 : CommitTransactionCommand();
1036 : }
1037 778 : return;
1038 : }
1039 :
1040 : /*
1041 : * Now, take a writer's lock on the database we are trying to connect to.
1042 : * If there is a concurrently running DROP DATABASE on that database, this
1043 : * will block us until it finishes (and has committed its update of
1044 : * pg_database).
1045 : *
1046 : * Note that the lock is not held long, only until the end of this startup
1047 : * transaction. This is OK since we will advertise our use of the
1048 : * database in the ProcArray before dropping the lock (in fact, that's the
1049 : * next thing to do). Anyone trying a DROP DATABASE after this point will
1050 : * see us in the array once they have the lock. Ordering is important for
1051 : * this because we don't want to advertise ourselves as being in this
1052 : * database until we have the lock; otherwise we create what amounts to a
1053 : * deadlock with CountOtherDBBackends().
1054 : *
1055 : * Note: use of RowExclusiveLock here is reasonable because we envision
1056 : * our session as being a concurrent writer of the database. If we had a
1057 : * way of declaring a session as being guaranteed-read-only, we could use
1058 : * AccessShareLock for such sessions and thereby not conflict against
1059 : * CREATE DATABASE.
1060 : */
1061 32030 : if (!bootstrap)
1062 31940 : LockSharedObject(DatabaseRelationId, dboid, 0, RowExclusiveLock);
1063 :
1064 : /*
1065 : * Recheck pg_database to make sure the target database hasn't gone away.
1066 : * If there was a concurrent DROP DATABASE, this ensures we will die
1067 : * cleanly without creating a mess.
1068 : */
1069 32030 : if (!bootstrap)
1070 : {
1071 : HeapTuple tuple;
1072 : Form_pg_database datform;
1073 :
1074 31940 : tuple = GetDatabaseTupleByOid(dboid);
1075 31940 : if (HeapTupleIsValid(tuple))
1076 31940 : datform = (Form_pg_database) GETSTRUCT(tuple);
1077 :
1078 31940 : if (!HeapTupleIsValid(tuple) ||
1079 25980 : (in_dbname && namestrcmp(&datform->datname, in_dbname)))
1080 : {
1081 0 : if (in_dbname)
1082 0 : ereport(FATAL,
1083 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1084 : errmsg("database \"%s\" does not exist", in_dbname),
1085 : errdetail("It seems to have just been dropped or renamed.")));
1086 : else
1087 0 : ereport(FATAL,
1088 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1089 : errmsg("database %u does not exist", dboid)));
1090 : }
1091 :
1092 31940 : strlcpy(dbname, NameStr(datform->datname), sizeof(dbname));
1093 :
1094 31940 : if (database_is_invalid_form(datform))
1095 : {
1096 10 : ereport(FATAL,
1097 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1098 : errmsg("cannot connect to invalid database \"%s\"", dbname),
1099 : errhint("Use DROP DATABASE to drop invalid databases."));
1100 : }
1101 :
1102 31930 : MyDatabaseTableSpace = datform->dattablespace;
1103 31930 : MyDatabaseHasLoginEventTriggers = datform->dathasloginevt;
1104 : /* pass the database name back to the caller */
1105 31930 : if (out_dbname)
1106 2386 : strcpy(out_dbname, dbname);
1107 : }
1108 :
1109 : /*
1110 : * Now that we rechecked, we are certain to be connected to a database and
1111 : * thus can set MyDatabaseId.
1112 : *
1113 : * It is important that MyDatabaseId only be set once we are sure that the
1114 : * target database can no longer be concurrently dropped or renamed. For
1115 : * example, without this guarantee, pgstat_update_dbstats() could create
1116 : * entries for databases that were just dropped in the pgstat shutdown
1117 : * callback, which could confuse other code paths like the autovacuum
1118 : * scheduler.
1119 : */
1120 32020 : MyDatabaseId = dboid;
1121 :
1122 : /*
1123 : * Now we can mark our PGPROC entry with the database ID.
1124 : *
1125 : * We assume this is an atomic store so no lock is needed; though actually
1126 : * things would work fine even if it weren't atomic. Anyone searching the
1127 : * ProcArray for this database's ID should hold the database lock, so they
1128 : * would not be executing concurrently with this store. A process looking
1129 : * for another database's ID could in theory see a chance match if it read
1130 : * a partially-updated databaseId value; but as long as all such searches
1131 : * wait and retry, as in CountOtherDBBackends(), they will certainly see
1132 : * the correct value on their next try.
1133 : */
1134 32020 : MyProc->databaseId = MyDatabaseId;
1135 :
1136 : /*
1137 : * We established a catalog snapshot while reading pg_authid and/or
1138 : * pg_database; but until we have set up MyDatabaseId, we won't react to
1139 : * incoming sinval messages for unshared catalogs, so we won't realize it
1140 : * if the snapshot has been invalidated. Assume it's no good anymore.
1141 : */
1142 32020 : InvalidateCatalogSnapshot();
1143 :
1144 : /*
1145 : * Now we should be able to access the database directory safely. Verify
1146 : * it's there and looks reasonable.
1147 : */
1148 32020 : fullpath = GetDatabasePath(MyDatabaseId, MyDatabaseTableSpace);
1149 :
1150 32020 : if (!bootstrap)
1151 : {
1152 31930 : if (access(fullpath, F_OK) == -1)
1153 : {
1154 0 : if (errno == ENOENT)
1155 0 : ereport(FATAL,
1156 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1157 : errmsg("database \"%s\" does not exist",
1158 : dbname),
1159 : errdetail("The database subdirectory \"%s\" is missing.",
1160 : fullpath)));
1161 : else
1162 0 : ereport(FATAL,
1163 : (errcode_for_file_access(),
1164 : errmsg("could not access directory \"%s\": %m",
1165 : fullpath)));
1166 : }
1167 :
1168 31930 : ValidatePgVersion(fullpath);
1169 : }
1170 :
1171 32020 : SetDatabasePath(fullpath);
1172 32020 : pfree(fullpath);
1173 :
1174 : /*
1175 : * It's now possible to do real access to the system catalogs.
1176 : *
1177 : * Load relcache entries for the system catalogs. This must create at
1178 : * least the minimum set of "nailed-in" cache entries.
1179 : */
1180 32020 : RelationCacheInitializePhase3();
1181 :
1182 : /* set up ACL framework (so CheckMyDatabase can check permissions) */
1183 32014 : initialize_acl();
1184 :
1185 : /*
1186 : * Re-read the pg_database row for our database, check permissions and set
1187 : * up database-specific GUC settings. We can't do this until all the
1188 : * database-access infrastructure is up. (Also, it wants to know if the
1189 : * user is a superuser, so the above stuff has to happen first.)
1190 : */
1191 32014 : if (!bootstrap)
1192 31924 : CheckMyDatabase(dbname, am_superuser,
1193 31924 : (flags & INIT_PG_OVERRIDE_ALLOW_CONNS) != 0);
1194 :
1195 : /*
1196 : * Now process any command-line switches and any additional GUC variable
1197 : * settings passed in the startup packet. We couldn't do this before
1198 : * because we didn't know if client is a superuser.
1199 : */
1200 32008 : if (MyProcPort != NULL)
1201 25854 : process_startup_options(MyProcPort, am_superuser);
1202 :
1203 : /* Process pg_db_role_setting options */
1204 32008 : process_settings(MyDatabaseId, GetSessionUserId());
1205 :
1206 : /* Apply PostAuthDelay as soon as we've read all options */
1207 32008 : if (PostAuthDelay > 0)
1208 0 : pg_usleep(PostAuthDelay * 1000000L);
1209 :
1210 : /*
1211 : * Initialize various default states that can't be set up until we've
1212 : * selected the active user and gotten the right GUC settings.
1213 : */
1214 :
1215 : /* set default namespace search path */
1216 32008 : InitializeSearchPath();
1217 :
1218 : /* initialize client encoding */
1219 32008 : InitializeClientEncoding();
1220 :
1221 : /* Initialize this backend's session state. */
1222 32008 : InitializeSession();
1223 :
1224 : /*
1225 : * If this is an interactive session, load any libraries that should be
1226 : * preloaded at backend start. Since those are determined by GUCs, this
1227 : * can't happen until GUC settings are complete, but we want it to happen
1228 : * during the initial transaction in case anything that requires database
1229 : * access needs to be done.
1230 : */
1231 32008 : if ((flags & INIT_PG_LOAD_SESSION_LIBS) != 0)
1232 24660 : process_session_preload_libraries();
1233 :
1234 : /* fill in the remainder of this entry in the PgBackendStatus array */
1235 32008 : if (!bootstrap)
1236 31918 : pgstat_bestart_final();
1237 :
1238 : /* close the transaction we started above */
1239 32008 : if (!bootstrap)
1240 31918 : CommitTransactionCommand();
1241 : }
1242 :
1243 : /*
1244 : * Process any command-line switches and any additional GUC variable
1245 : * settings passed in the startup packet.
1246 : */
1247 : static void
1248 26760 : process_startup_options(Port *port, bool am_superuser)
1249 : {
1250 : GucContext gucctx;
1251 : ListCell *gucopts;
1252 :
1253 26760 : gucctx = am_superuser ? PGC_SU_BACKEND : PGC_BACKEND;
1254 :
1255 : /*
1256 : * First process any command-line switches that were included in the
1257 : * startup packet, if we are in a regular backend.
1258 : */
1259 26760 : if (port->cmdline_options != NULL)
1260 : {
1261 : /*
1262 : * The maximum possible number of commandline arguments that could
1263 : * come from port->cmdline_options is (strlen + 1) / 2; see
1264 : * pg_split_opts().
1265 : */
1266 : char **av;
1267 : int maxac;
1268 : int ac;
1269 :
1270 7016 : maxac = 2 + (strlen(port->cmdline_options) + 1) / 2;
1271 :
1272 7016 : av = (char **) palloc(maxac * sizeof(char *));
1273 7016 : ac = 0;
1274 :
1275 7016 : av[ac++] = "postgres";
1276 :
1277 7016 : pg_split_opts(av, &ac, port->cmdline_options);
1278 :
1279 7016 : av[ac] = NULL;
1280 :
1281 : Assert(ac < maxac);
1282 :
1283 7016 : (void) process_postgres_switches(ac, av, gucctx, NULL);
1284 : }
1285 :
1286 : /*
1287 : * Process any additional GUC variable settings passed in startup packet.
1288 : * These are handled exactly like command-line variables.
1289 : */
1290 26760 : gucopts = list_head(port->guc_options);
1291 63618 : while (gucopts)
1292 : {
1293 : char *name;
1294 : char *value;
1295 :
1296 36858 : name = lfirst(gucopts);
1297 36858 : gucopts = lnext(port->guc_options, gucopts);
1298 :
1299 36858 : value = lfirst(gucopts);
1300 36858 : gucopts = lnext(port->guc_options, gucopts);
1301 :
1302 36858 : SetConfigOption(name, value, gucctx, PGC_S_CLIENT);
1303 : }
1304 26760 : }
1305 :
1306 : /*
1307 : * Load GUC settings from pg_db_role_setting.
1308 : *
1309 : * We try specific settings for the database/role combination, as well as
1310 : * general for this database and for this user.
1311 : */
1312 : static void
1313 32008 : process_settings(Oid databaseid, Oid roleid)
1314 : {
1315 : Relation relsetting;
1316 : Snapshot snapshot;
1317 :
1318 32008 : if (!IsUnderPostmaster)
1319 194 : return;
1320 :
1321 31814 : relsetting = table_open(DbRoleSettingRelationId, AccessShareLock);
1322 :
1323 : /* read all the settings under the same snapshot for efficiency */
1324 31814 : snapshot = RegisterSnapshot(GetCatalogSnapshot(DbRoleSettingRelationId));
1325 :
1326 : /* Later settings are ignored if set earlier. */
1327 31814 : ApplySetting(snapshot, databaseid, roleid, relsetting, PGC_S_DATABASE_USER);
1328 31814 : ApplySetting(snapshot, InvalidOid, roleid, relsetting, PGC_S_USER);
1329 31814 : ApplySetting(snapshot, databaseid, InvalidOid, relsetting, PGC_S_DATABASE);
1330 31814 : ApplySetting(snapshot, InvalidOid, InvalidOid, relsetting, PGC_S_GLOBAL);
1331 :
1332 31814 : UnregisterSnapshot(snapshot);
1333 31814 : table_close(relsetting, AccessShareLock);
1334 : }
1335 :
1336 : /*
1337 : * Backend-shutdown callback. Do cleanup that we want to be sure happens
1338 : * before all the supporting modules begin to nail their doors shut via
1339 : * their own callbacks.
1340 : *
1341 : * User-level cleanup, such as temp-relation removal and UNLISTEN, happens
1342 : * via separate callbacks that execute before this one. We don't combine the
1343 : * callbacks because we still want this one to happen if the user-level
1344 : * cleanup fails.
1345 : */
1346 : static void
1347 34610 : ShutdownPostgres(int code, Datum arg)
1348 : {
1349 : /* Make sure we've killed any active transaction */
1350 34610 : AbortOutOfAnyTransaction();
1351 :
1352 : /*
1353 : * User locks are not released by transaction end, so be sure to release
1354 : * them explicitly.
1355 : */
1356 34610 : LockReleaseAll(USER_LOCKMETHOD, true);
1357 34610 : }
1358 :
1359 :
1360 : /*
1361 : * STATEMENT_TIMEOUT handler: trigger a query-cancel interrupt.
1362 : */
1363 : static void
1364 12 : StatementTimeoutHandler(void)
1365 : {
1366 12 : int sig = SIGINT;
1367 :
1368 : /*
1369 : * During authentication the timeout is used to deal with
1370 : * authentication_timeout - we want to quit in response to such timeouts.
1371 : */
1372 12 : if (ClientAuthInProgress)
1373 0 : sig = SIGTERM;
1374 :
1375 : #ifdef HAVE_SETSID
1376 : /* try to signal whole process group */
1377 12 : kill(-MyProcPid, sig);
1378 : #endif
1379 12 : kill(MyProcPid, sig);
1380 12 : }
1381 :
1382 : /*
1383 : * LOCK_TIMEOUT handler: trigger a query-cancel interrupt.
1384 : */
1385 : static void
1386 8 : LockTimeoutHandler(void)
1387 : {
1388 : #ifdef HAVE_SETSID
1389 : /* try to signal whole process group */
1390 8 : kill(-MyProcPid, SIGINT);
1391 : #endif
1392 8 : kill(MyProcPid, SIGINT);
1393 8 : }
1394 :
1395 : static void
1396 2 : TransactionTimeoutHandler(void)
1397 : {
1398 2 : TransactionTimeoutPending = true;
1399 2 : InterruptPending = true;
1400 2 : SetLatch(MyLatch);
1401 2 : }
1402 :
1403 : static void
1404 2 : IdleInTransactionSessionTimeoutHandler(void)
1405 : {
1406 2 : IdleInTransactionSessionTimeoutPending = true;
1407 2 : InterruptPending = true;
1408 2 : SetLatch(MyLatch);
1409 2 : }
1410 :
1411 : static void
1412 2 : IdleSessionTimeoutHandler(void)
1413 : {
1414 2 : IdleSessionTimeoutPending = true;
1415 2 : InterruptPending = true;
1416 2 : SetLatch(MyLatch);
1417 2 : }
1418 :
1419 : static void
1420 24 : IdleStatsUpdateTimeoutHandler(void)
1421 : {
1422 24 : IdleStatsUpdateTimeoutPending = true;
1423 24 : InterruptPending = true;
1424 24 : SetLatch(MyLatch);
1425 24 : }
1426 :
1427 : static void
1428 0 : ClientCheckTimeoutHandler(void)
1429 : {
1430 0 : CheckClientConnectionPending = true;
1431 0 : InterruptPending = true;
1432 0 : SetLatch(MyLatch);
1433 0 : }
1434 :
1435 : /*
1436 : * Returns true if at least one role is defined in this database cluster.
1437 : */
1438 : static bool
1439 108 : ThereIsAtLeastOneRole(void)
1440 : {
1441 : Relation pg_authid_rel;
1442 : TableScanDesc scan;
1443 : bool result;
1444 :
1445 108 : pg_authid_rel = table_open(AuthIdRelationId, AccessShareLock);
1446 :
1447 108 : scan = table_beginscan_catalog(pg_authid_rel, 0, NULL);
1448 108 : result = (heap_getnext(scan, ForwardScanDirection) != NULL);
1449 :
1450 108 : table_endscan(scan);
1451 108 : table_close(pg_authid_rel, AccessShareLock);
1452 :
1453 108 : return result;
1454 : }
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