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 24348 : 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 24348 : 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 24348 : relation = table_open(DatabaseRelationId, AccessShareLock);
126 24348 : scan = systable_beginscan(relation, DatabaseNameIndexId,
127 : criticalSharedRelcachesBuilt,
128 : NULL,
129 : 1, key);
130 :
131 24348 : tuple = systable_getnext(scan);
132 :
133 : /* Must copy tuple before releasing buffer */
134 24348 : if (HeapTupleIsValid(tuple))
135 24328 : tuple = heap_copytuple(tuple);
136 :
137 : /* all done */
138 24348 : systable_endscan(scan);
139 24348 : table_close(relation, AccessShareLock);
140 :
141 24348 : return tuple;
142 : }
143 :
144 : /*
145 : * GetDatabaseTupleByOid -- as above, but search by database OID
146 : */
147 : static HeapTuple
148 31434 : 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 31434 : 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 31434 : relation = table_open(DatabaseRelationId, AccessShareLock);
169 31434 : scan = systable_beginscan(relation, DatabaseOidIndexId,
170 : criticalSharedRelcachesBuilt,
171 : NULL,
172 : 1, key);
173 :
174 31434 : tuple = systable_getnext(scan);
175 :
176 : /* Must copy tuple before releasing buffer */
177 31434 : if (HeapTupleIsValid(tuple))
178 31434 : tuple = heap_copytuple(tuple);
179 :
180 : /* all done */
181 31434 : systable_endscan(scan);
182 31434 : table_close(relation, AccessShareLock);
183 :
184 31434 : 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 25286 : PerformAuthentication(Port *port)
195 : {
196 : /* This should be set already, but let's make sure */
197 25286 : 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 25286 : 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 25286 : enable_timeout_after(STATEMENT_TIMEOUT, AuthenticationTimeout * 1000);
248 :
249 : /*
250 : * Now perform authentication exchange.
251 : */
252 25286 : set_ps_display("authentication");
253 25286 : ClientAuthentication(port); /* might not return, if failure */
254 :
255 : /*
256 : * Done with authentication. Disable the timeout, and log if needed.
257 : */
258 25154 : disable_timeout(STATEMENT_TIMEOUT, false);
259 :
260 : /* Capture authentication end time for logging */
261 25154 : conn_timing.auth_end = GetCurrentTimestamp();
262 :
263 25154 : if (log_connections & LOG_CONNECTION_AUTHORIZATION)
264 : {
265 : StringInfoData logmsg;
266 :
267 420 : initStringInfo(&logmsg);
268 420 : if (am_walsender)
269 0 : appendStringInfo(&logmsg, _("replication connection authorized: user=%s"),
270 : port->user_name);
271 : else
272 420 : appendStringInfo(&logmsg, _("connection authorized: user=%s"),
273 : port->user_name);
274 420 : if (!am_walsender)
275 420 : appendStringInfo(&logmsg, _(" database=%s"), port->database_name);
276 :
277 420 : if (port->application_name != NULL)
278 420 : appendStringInfo(&logmsg, _(" application_name=%s"),
279 : port->application_name);
280 :
281 : #ifdef USE_SSL
282 420 : 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 :
309 420 : ereport(LOG, errmsg_internal("%s", logmsg.data));
310 420 : pfree(logmsg.data);
311 : }
312 :
313 25154 : set_ps_display("startup");
314 :
315 25154 : ClientAuthInProgress = false; /* client_min_messages is active now */
316 25154 : }
317 :
318 :
319 : /*
320 : * CheckMyDatabase -- fetch information from the pg_database entry for our DB
321 : */
322 : static void
323 31420 : 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 31420 : tup = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(MyDatabaseId));
334 31420 : if (!HeapTupleIsValid(tup))
335 0 : elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
336 31420 : dbform = (Form_pg_database) GETSTRUCT(tup);
337 :
338 : /* This recheck is strictly paranoia */
339 31420 : 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 31420 : 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 31300 : 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 31844 : if (!am_superuser && !override_allow_connections &&
373 546 : 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 31298 : 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 31418 : SetDatabaseEncoding(dbform->encoding);
407 : /* Record it as a GUC internal option, too */
408 31418 : 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 31418 : SetConfigOption("client_encoding", GetDatabaseEncodingName(),
412 : PGC_BACKEND, PGC_S_DYNAMIC_DEFAULT);
413 :
414 : /* assign locale variables */
415 31418 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datcollate);
416 31418 : collate = TextDatumGetCString(datum);
417 31418 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datctype);
418 31418 : ctype = TextDatumGetCString(datum);
419 :
420 31418 : 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 31418 : 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 31418 : if (strcmp(ctype, "C") == 0 ||
435 28562 : strcmp(ctype, "POSIX") == 0)
436 2856 : database_ctype_is_c = true;
437 :
438 31418 : 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 31414 : datum = SysCacheGetAttr(DATABASEOID, tup, Anum_pg_database_datcollversion,
446 : &isnull);
447 31414 : if (!isnull)
448 : {
449 : char *actual_versionstr;
450 : char *collversionstr;
451 : char *locale;
452 :
453 29688 : collversionstr = TextDatumGetCString(datum);
454 :
455 29688 : if (dbform->datlocprovider == COLLPROVIDER_LIBC)
456 27948 : locale = collate;
457 : else
458 : {
459 1740 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datlocale);
460 1740 : locale = TextDatumGetCString(datum);
461 : }
462 :
463 29688 : actual_versionstr = get_collation_actual_version(dbform->datlocprovider, locale);
464 29688 : 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 29688 : 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 31414 : ReleaseSysCache(tup);
483 31414 : }
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 7126 : pg_split_opts(char **argv, int *argcp, const char *optstr)
498 : {
499 : StringInfoData s;
500 :
501 7126 : initStringInfo(&s);
502 :
503 26070 : while (*optstr)
504 : {
505 18944 : bool last_was_escape = false;
506 :
507 18944 : resetStringInfo(&s);
508 :
509 : /* skip over leading space */
510 35116 : while (isspace((unsigned char) *optstr))
511 16172 : optstr++;
512 :
513 18944 : 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 288992 : while (*optstr)
521 : {
522 281866 : if (isspace((unsigned char) *optstr) && !last_was_escape)
523 11818 : break;
524 :
525 270048 : if (!last_was_escape && *optstr == '\\')
526 28 : last_was_escape = true;
527 : else
528 : {
529 270020 : last_was_escape = false;
530 270020 : appendStringInfoChar(&s, *optstr);
531 : }
532 :
533 270048 : optstr++;
534 : }
535 :
536 : /* now store the option in the next argv[] position */
537 18944 : argv[(*argcp)++] = pstrdup(s.data);
538 : }
539 :
540 7126 : pfree(s.data);
541 7126 : }
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 2130 : InitializeMaxBackends(void)
556 : {
557 : Assert(MaxBackends == 0);
558 :
559 : /* Note that this does not include "auxiliary" processes */
560 2130 : MaxBackends = MaxConnections + autovacuum_worker_slots +
561 2130 : max_worker_processes + max_wal_senders + NUM_SPECIAL_WORKER_PROCS;
562 :
563 2130 : 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 2130 : }
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 : void
580 2130 : InitializeFastPathLocks(void)
581 : {
582 : /* Should be initialized only once. */
583 : Assert(FastPathLockGroupsPerBackend == 0);
584 :
585 : /*
586 : * Based on the max_locks_per_transaction GUC, as that's a good indicator
587 : * of the expected number of locks, figure out the value for
588 : * FastPathLockGroupsPerBackend. This must be a power-of-two. We cap the
589 : * value at FP_LOCK_GROUPS_PER_BACKEND_MAX and insist the value is at
590 : * least 1.
591 : *
592 : * The default max_locks_per_transaction = 64 means 4 groups by default.
593 : */
594 2130 : FastPathLockGroupsPerBackend =
595 2130 : Max(Min(pg_nextpower2_32(max_locks_per_xact) / FP_LOCK_SLOTS_PER_GROUP,
596 : FP_LOCK_GROUPS_PER_BACKEND_MAX), 1);
597 :
598 : /* Validate we did get a power-of-two */
599 : Assert(FastPathLockGroupsPerBackend ==
600 : pg_nextpower2_32(FastPathLockGroupsPerBackend));
601 2130 : }
602 :
603 : /*
604 : * Early initialization of a backend (either standalone or under postmaster).
605 : * This happens even before InitPostgres.
606 : *
607 : * This is separate from InitPostgres because it is also called by auxiliary
608 : * processes, such as the background writer process, which may not call
609 : * InitPostgres at all.
610 : */
611 : void
612 42452 : BaseInit(void)
613 : {
614 : Assert(MyProc != NULL);
615 :
616 : /*
617 : * Initialize our input/output/debugging file descriptors.
618 : */
619 42452 : DebugFileOpen();
620 :
621 : /*
622 : * Initialize file access. Done early so other subsystems can access
623 : * files.
624 : */
625 42452 : InitFileAccess();
626 :
627 : /*
628 : * Initialize statistics reporting. This needs to happen early to ensure
629 : * that pgstat's shutdown callback runs after the shutdown callbacks of
630 : * all subsystems that can produce stats (like e.g. transaction commits
631 : * can).
632 : */
633 42452 : pgstat_initialize();
634 :
635 : /*
636 : * Initialize AIO before infrastructure that might need to actually
637 : * execute AIO.
638 : */
639 42452 : pgaio_init_backend();
640 :
641 : /* Do local initialization of storage and buffer managers */
642 42452 : InitSync();
643 42452 : smgrinit();
644 42452 : InitBufferManagerAccess();
645 :
646 : /*
647 : * Initialize temporary file access after pgstat, so that the temporary
648 : * file shutdown hook can report temporary file statistics.
649 : */
650 42452 : InitTemporaryFileAccess();
651 :
652 : /*
653 : * Initialize local buffers for WAL record construction, in case we ever
654 : * try to insert XLOG.
655 : */
656 42452 : InitXLogInsert();
657 :
658 : /* Initialize lock manager's local structs */
659 42452 : InitLockManagerAccess();
660 :
661 : /*
662 : * Initialize replication slots after pgstat. The exit hook might need to
663 : * drop ephemeral slots, which in turn triggers stats reporting.
664 : */
665 42452 : ReplicationSlotInitialize();
666 42452 : }
667 :
668 :
669 : /* --------------------------------
670 : * InitPostgres
671 : * Initialize POSTGRES.
672 : *
673 : * Parameters:
674 : * in_dbname, dboid: specify database to connect to, as described below
675 : * username, useroid: specify role to connect as, as described below
676 : * flags:
677 : * - INIT_PG_LOAD_SESSION_LIBS to honor [session|local]_preload_libraries.
678 : * - INIT_PG_OVERRIDE_ALLOW_CONNS to connect despite !datallowconn.
679 : * - INIT_PG_OVERRIDE_ROLE_LOGIN to connect despite !rolcanlogin.
680 : * out_dbname: optional output parameter, see below; pass NULL if not used
681 : *
682 : * The database can be specified by name, using the in_dbname parameter, or by
683 : * OID, using the dboid parameter. Specify NULL or InvalidOid respectively
684 : * for the unused parameter. If dboid is provided, the actual database
685 : * name can be returned to the caller in out_dbname. If out_dbname isn't
686 : * NULL, it must point to a buffer of size NAMEDATALEN.
687 : *
688 : * Similarly, the role can be passed by name, using the username parameter,
689 : * or by OID using the useroid parameter.
690 : *
691 : * In bootstrap mode the database and username parameters are NULL/InvalidOid.
692 : * The autovacuum launcher process doesn't specify these parameters either,
693 : * because it only goes far enough to be able to read pg_database; it doesn't
694 : * connect to any particular database. An autovacuum worker specifies a
695 : * database but not a username; conversely, a physical walsender specifies
696 : * username but not database.
697 : *
698 : * By convention, INIT_PG_LOAD_SESSION_LIBS should be passed in "flags" in
699 : * "interactive" sessions (including standalone backends), but not in
700 : * background processes such as autovacuum. Note in particular that it
701 : * shouldn't be true in parallel worker processes; those have another
702 : * mechanism for replicating their leader's set of loaded libraries.
703 : *
704 : * We expect that InitProcess() was already called, so we already have a
705 : * PGPROC struct ... but it's not completely filled in yet.
706 : *
707 : * Note:
708 : * Be very careful with the order of calls in the InitPostgres function.
709 : * --------------------------------
710 : */
711 : void
712 34180 : InitPostgres(const char *in_dbname, Oid dboid,
713 : const char *username, Oid useroid,
714 : bits32 flags,
715 : char *out_dbname)
716 : {
717 34180 : bool bootstrap = IsBootstrapProcessingMode();
718 : bool am_superuser;
719 : char *fullpath;
720 : char dbname[NAMEDATALEN];
721 34180 : int nfree = 0;
722 :
723 34180 : elog(DEBUG3, "InitPostgres");
724 :
725 : /*
726 : * Add my PGPROC struct to the ProcArray.
727 : *
728 : * Once I have done this, I am visible to other backends!
729 : */
730 34180 : InitProcessPhase2();
731 :
732 : /* Initialize status reporting */
733 34180 : pgstat_beinit();
734 :
735 : /*
736 : * And initialize an entry in the PgBackendStatus array. That way, if
737 : * LWLocks or third-party authentication should happen to hang, it is
738 : * possible to retrieve some information about what is going on.
739 : */
740 34180 : if (!bootstrap)
741 : {
742 34078 : pgstat_bestart_initial();
743 34078 : INJECTION_POINT("init-pre-auth", NULL);
744 : }
745 :
746 : /*
747 : * Initialize my entry in the shared-invalidation manager's array of
748 : * per-backend data.
749 : */
750 34180 : SharedInvalBackendInit(false);
751 :
752 34180 : ProcSignalInit(MyCancelKey, MyCancelKeyLength);
753 :
754 : /*
755 : * Also set up timeout handlers needed for backend operation. We need
756 : * these in every case except bootstrap.
757 : */
758 34180 : if (!bootstrap)
759 : {
760 34078 : RegisterTimeout(DEADLOCK_TIMEOUT, CheckDeadLockAlert);
761 34078 : RegisterTimeout(STATEMENT_TIMEOUT, StatementTimeoutHandler);
762 34078 : RegisterTimeout(LOCK_TIMEOUT, LockTimeoutHandler);
763 34078 : RegisterTimeout(IDLE_IN_TRANSACTION_SESSION_TIMEOUT,
764 : IdleInTransactionSessionTimeoutHandler);
765 34078 : RegisterTimeout(TRANSACTION_TIMEOUT, TransactionTimeoutHandler);
766 34078 : RegisterTimeout(IDLE_SESSION_TIMEOUT, IdleSessionTimeoutHandler);
767 34078 : RegisterTimeout(CLIENT_CONNECTION_CHECK_TIMEOUT, ClientCheckTimeoutHandler);
768 34078 : RegisterTimeout(IDLE_STATS_UPDATE_TIMEOUT,
769 : IdleStatsUpdateTimeoutHandler);
770 : }
771 :
772 : /*
773 : * If this is either a bootstrap process or a standalone backend, start up
774 : * the XLOG machinery, and register to have it closed down at exit. In
775 : * other cases, the startup process is responsible for starting up the
776 : * XLOG machinery, and the checkpointer for closing it down.
777 : */
778 34180 : if (!IsUnderPostmaster)
779 : {
780 : /*
781 : * We don't yet have an aux-process resource owner, but StartupXLOG
782 : * and ShutdownXLOG will need one. Hence, create said resource owner
783 : * (and register a callback to clean it up after ShutdownXLOG runs).
784 : */
785 222 : CreateAuxProcessResourceOwner();
786 :
787 222 : StartupXLOG();
788 : /* Release (and warn about) any buffer pins leaked in StartupXLOG */
789 222 : ReleaseAuxProcessResources(true);
790 : /* Reset CurrentResourceOwner to nothing for the moment */
791 222 : CurrentResourceOwner = NULL;
792 :
793 : /*
794 : * Use before_shmem_exit() so that ShutdownXLOG() can rely on DSM
795 : * segments etc to work (which in turn is required for pgstats).
796 : */
797 222 : before_shmem_exit(pgstat_before_server_shutdown, 0);
798 222 : before_shmem_exit(ShutdownXLOG, 0);
799 : }
800 :
801 : /*
802 : * Initialize the relation cache and the system catalog caches. Note that
803 : * no catalog access happens here; we only set up the hashtable structure.
804 : * We must do this before starting a transaction because transaction abort
805 : * would try to touch these hashtables.
806 : */
807 34180 : RelationCacheInitialize();
808 34180 : InitCatalogCache();
809 34180 : InitPlanCache();
810 :
811 : /* Initialize portal manager */
812 34180 : EnablePortalManager();
813 :
814 : /*
815 : * Load relcache entries for the shared system catalogs. This must create
816 : * at least entries for pg_database and catalogs used for authentication.
817 : */
818 34180 : RelationCacheInitializePhase2();
819 :
820 : /*
821 : * Set up process-exit callback to do pre-shutdown cleanup. This is the
822 : * one of the first before_shmem_exit callbacks we register; thus, this
823 : * will be one the last things we do before low-level modules like the
824 : * buffer manager begin to close down. We need to have this in place
825 : * before we begin our first transaction --- if we fail during the
826 : * initialization transaction, as is entirely possible, we need the
827 : * AbortTransaction call to clean up.
828 : */
829 34180 : before_shmem_exit(ShutdownPostgres, 0);
830 :
831 : /* The autovacuum launcher is done here */
832 34180 : if (AmAutoVacuumLauncherProcess())
833 : {
834 : /* fill in the remainder of this entry in the PgBackendStatus array */
835 748 : pgstat_bestart_final();
836 :
837 2478 : return;
838 : }
839 :
840 : /*
841 : * Start a new transaction here before first access to db.
842 : */
843 33432 : if (!bootstrap)
844 : {
845 : /* statement_timestamp must be set for timeouts to work correctly */
846 33330 : SetCurrentStatementStartTimestamp();
847 33330 : StartTransactionCommand();
848 :
849 : /*
850 : * transaction_isolation will have been set to the default by the
851 : * above. If the default is "serializable", and we are in hot
852 : * standby, we will fail if we don't change it to something lower.
853 : * Fortunately, "read committed" is plenty good enough.
854 : */
855 33330 : XactIsoLevel = XACT_READ_COMMITTED;
856 : }
857 :
858 : /*
859 : * Perform client authentication if necessary, then figure out our
860 : * postgres user ID, and see if we are a superuser.
861 : *
862 : * In standalone mode, autovacuum worker processes and slot sync worker
863 : * process, we use a fixed ID, otherwise we figure it out from the
864 : * authenticated user name.
865 : */
866 33432 : if (bootstrap || AmAutoVacuumWorkerProcess() || AmLogicalSlotSyncWorkerProcess())
867 : {
868 3572 : InitializeSessionUserIdStandalone();
869 3572 : am_superuser = true;
870 : }
871 29860 : else if (!IsUnderPostmaster)
872 : {
873 120 : InitializeSessionUserIdStandalone();
874 120 : am_superuser = true;
875 120 : if (!ThereIsAtLeastOneRole())
876 0 : ereport(WARNING,
877 : (errcode(ERRCODE_UNDEFINED_OBJECT),
878 : errmsg("no roles are defined in this database system"),
879 : errhint("You should immediately run CREATE USER \"%s\" SUPERUSER;.",
880 : username != NULL ? username : "postgres")));
881 : }
882 29740 : else if (AmBackgroundWorkerProcess())
883 : {
884 4454 : if (username == NULL && !OidIsValid(useroid))
885 : {
886 812 : InitializeSessionUserIdStandalone();
887 812 : am_superuser = true;
888 : }
889 : else
890 : {
891 3642 : InitializeSessionUserId(username, useroid,
892 3642 : (flags & INIT_PG_OVERRIDE_ROLE_LOGIN) != 0);
893 3640 : am_superuser = superuser();
894 : }
895 : }
896 : else
897 : {
898 : /* normal multiuser case */
899 : Assert(MyProcPort != NULL);
900 25286 : PerformAuthentication(MyProcPort);
901 25154 : InitializeSessionUserId(username, useroid, false);
902 : /* ensure that auth_method is actually valid, aka authn_id is not NULL */
903 25146 : if (MyClientConnectionInfo.authn_id)
904 248 : InitializeSystemUser(MyClientConnectionInfo.authn_id,
905 : hba_authname(MyClientConnectionInfo.auth_method));
906 25146 : am_superuser = superuser();
907 : }
908 :
909 : /* Report any SSL/GSS details for the session. */
910 33290 : if (MyProcPort != NULL)
911 : {
912 : Assert(!bootstrap);
913 :
914 25146 : pgstat_bestart_security();
915 : }
916 :
917 : /*
918 : * Binary upgrades only allowed super-user connections
919 : */
920 33290 : if (IsBinaryUpgrade && !am_superuser)
921 : {
922 0 : ereport(FATAL,
923 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
924 : errmsg("must be superuser to connect in binary upgrade mode")));
925 : }
926 :
927 : /*
928 : * The last few regular connection slots are reserved for superusers and
929 : * roles with privileges of pg_use_reserved_connections. We do not apply
930 : * these limits to background processes, since they all have their own
931 : * pools of PGPROC slots.
932 : *
933 : * Note: At this point, the new backend has already claimed a proc struct,
934 : * so we must check whether the number of free slots is strictly less than
935 : * the reserved connection limits.
936 : */
937 33290 : if (AmRegularBackendProcess() && !am_superuser &&
938 484 : (SuperuserReservedConnections + ReservedConnections) > 0 &&
939 484 : !HaveNFreeProcs(SuperuserReservedConnections + ReservedConnections, &nfree))
940 : {
941 8 : if (nfree < SuperuserReservedConnections)
942 2 : ereport(FATAL,
943 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
944 : errmsg("remaining connection slots are reserved for roles with the %s attribute",
945 : "SUPERUSER")));
946 :
947 6 : if (!has_privs_of_role(GetUserId(), ROLE_PG_USE_RESERVED_CONNECTIONS))
948 2 : ereport(FATAL,
949 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
950 : errmsg("remaining connection slots are reserved for roles with privileges of the \"%s\" role",
951 : "pg_use_reserved_connections")));
952 : }
953 :
954 : /* Check replication permissions needed for walsender processes. */
955 33286 : if (am_walsender)
956 : {
957 : Assert(!bootstrap);
958 :
959 2246 : if (!has_rolreplication(GetUserId()))
960 0 : ereport(FATAL,
961 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
962 : errmsg("permission denied to start WAL sender"),
963 : errdetail("Only roles with the %s attribute may start a WAL sender process.",
964 : "REPLICATION")));
965 : }
966 :
967 : /*
968 : * If this is a plain walsender only supporting physical replication, we
969 : * don't want to connect to any particular database. Just finish the
970 : * backend startup by processing any options from the startup packet, and
971 : * we're done.
972 : */
973 33286 : if (am_walsender && !am_db_walsender)
974 : {
975 : /* process any options passed in the startup packet */
976 922 : if (MyProcPort != NULL)
977 922 : process_startup_options(MyProcPort, am_superuser);
978 :
979 : /* Apply PostAuthDelay as soon as we've read all options */
980 922 : if (PostAuthDelay > 0)
981 0 : pg_usleep(PostAuthDelay * 1000000L);
982 :
983 : /* initialize client encoding */
984 922 : InitializeClientEncoding();
985 :
986 : /* fill in the remainder of this entry in the PgBackendStatus array */
987 922 : pgstat_bestart_final();
988 :
989 : /* close the transaction we started above */
990 922 : CommitTransactionCommand();
991 :
992 922 : return;
993 : }
994 :
995 : /*
996 : * Set up the global variables holding database id and default tablespace.
997 : * But note we won't actually try to touch the database just yet.
998 : *
999 : * We take a shortcut in the bootstrap case, otherwise we have to look up
1000 : * the db's entry in pg_database.
1001 : */
1002 32364 : if (bootstrap)
1003 : {
1004 102 : dboid = Template1DbOid;
1005 102 : MyDatabaseTableSpace = DEFAULTTABLESPACE_OID;
1006 : }
1007 32262 : else if (in_dbname != NULL)
1008 : {
1009 : HeapTuple tuple;
1010 : Form_pg_database dbform;
1011 :
1012 24348 : tuple = GetDatabaseTuple(in_dbname);
1013 24348 : if (!HeapTupleIsValid(tuple))
1014 20 : ereport(FATAL,
1015 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1016 : errmsg("database \"%s\" does not exist", in_dbname)));
1017 24328 : dbform = (Form_pg_database) GETSTRUCT(tuple);
1018 24328 : dboid = dbform->oid;
1019 : }
1020 7914 : else if (!OidIsValid(dboid))
1021 : {
1022 : /*
1023 : * If this is a background worker not bound to any particular
1024 : * database, we're done now. Everything that follows only makes sense
1025 : * if we are bound to a specific database. We do need to close the
1026 : * transaction we started before returning.
1027 : */
1028 808 : if (!bootstrap)
1029 : {
1030 808 : pgstat_bestart_final();
1031 808 : CommitTransactionCommand();
1032 : }
1033 808 : return;
1034 : }
1035 :
1036 : /*
1037 : * Now, take a writer's lock on the database we are trying to connect to.
1038 : * If there is a concurrently running DROP DATABASE on that database, this
1039 : * will block us until it finishes (and has committed its update of
1040 : * pg_database).
1041 : *
1042 : * Note that the lock is not held long, only until the end of this startup
1043 : * transaction. This is OK since we will advertise our use of the
1044 : * database in the ProcArray before dropping the lock (in fact, that's the
1045 : * next thing to do). Anyone trying a DROP DATABASE after this point will
1046 : * see us in the array once they have the lock. Ordering is important for
1047 : * this because we don't want to advertise ourselves as being in this
1048 : * database until we have the lock; otherwise we create what amounts to a
1049 : * deadlock with CountOtherDBBackends().
1050 : *
1051 : * Note: use of RowExclusiveLock here is reasonable because we envision
1052 : * our session as being a concurrent writer of the database. If we had a
1053 : * way of declaring a session as being guaranteed-read-only, we could use
1054 : * AccessShareLock for such sessions and thereby not conflict against
1055 : * CREATE DATABASE.
1056 : */
1057 31536 : if (!bootstrap)
1058 31434 : LockSharedObject(DatabaseRelationId, dboid, 0, RowExclusiveLock);
1059 :
1060 : /*
1061 : * Recheck pg_database to make sure the target database hasn't gone away.
1062 : * If there was a concurrent DROP DATABASE, this ensures we will die
1063 : * cleanly without creating a mess.
1064 : */
1065 31536 : if (!bootstrap)
1066 : {
1067 : HeapTuple tuple;
1068 : Form_pg_database datform;
1069 :
1070 31434 : tuple = GetDatabaseTupleByOid(dboid);
1071 31434 : if (HeapTupleIsValid(tuple))
1072 31434 : datform = (Form_pg_database) GETSTRUCT(tuple);
1073 :
1074 31434 : if (!HeapTupleIsValid(tuple) ||
1075 24328 : (in_dbname && namestrcmp(&datform->datname, in_dbname)))
1076 : {
1077 0 : if (in_dbname)
1078 0 : ereport(FATAL,
1079 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1080 : errmsg("database \"%s\" does not exist", in_dbname),
1081 : errdetail("It seems to have just been dropped or renamed.")));
1082 : else
1083 0 : ereport(FATAL,
1084 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1085 : errmsg("database %u does not exist", dboid)));
1086 : }
1087 :
1088 31434 : strlcpy(dbname, NameStr(datform->datname), sizeof(dbname));
1089 :
1090 31434 : if (database_is_invalid_form(datform))
1091 : {
1092 8 : ereport(FATAL,
1093 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1094 : errmsg("cannot connect to invalid database \"%s\"", dbname),
1095 : errhint("Use DROP DATABASE to drop invalid databases."));
1096 : }
1097 :
1098 31426 : MyDatabaseTableSpace = datform->dattablespace;
1099 31426 : MyDatabaseHasLoginEventTriggers = datform->dathasloginevt;
1100 : /* pass the database name back to the caller */
1101 31426 : if (out_dbname)
1102 3462 : strcpy(out_dbname, dbname);
1103 : }
1104 :
1105 : /*
1106 : * Now that we rechecked, we are certain to be connected to a database and
1107 : * thus can set MyDatabaseId.
1108 : *
1109 : * It is important that MyDatabaseId only be set once we are sure that the
1110 : * target database can no longer be concurrently dropped or renamed. For
1111 : * example, without this guarantee, pgstat_update_dbstats() could create
1112 : * entries for databases that were just dropped in the pgstat shutdown
1113 : * callback, which could confuse other code paths like the autovacuum
1114 : * scheduler.
1115 : */
1116 31528 : MyDatabaseId = dboid;
1117 :
1118 : /*
1119 : * Now we can mark our PGPROC entry with the database ID.
1120 : *
1121 : * We assume this is an atomic store so no lock is needed; though actually
1122 : * things would work fine even if it weren't atomic. Anyone searching the
1123 : * ProcArray for this database's ID should hold the database lock, so they
1124 : * would not be executing concurrently with this store. A process looking
1125 : * for another database's ID could in theory see a chance match if it read
1126 : * a partially-updated databaseId value; but as long as all such searches
1127 : * wait and retry, as in CountOtherDBBackends(), they will certainly see
1128 : * the correct value on their next try.
1129 : */
1130 31528 : MyProc->databaseId = MyDatabaseId;
1131 :
1132 : /*
1133 : * We established a catalog snapshot while reading pg_authid and/or
1134 : * pg_database; but until we have set up MyDatabaseId, we won't react to
1135 : * incoming sinval messages for unshared catalogs, so we won't realize it
1136 : * if the snapshot has been invalidated. Assume it's no good anymore.
1137 : */
1138 31528 : InvalidateCatalogSnapshot();
1139 :
1140 : /*
1141 : * Now we should be able to access the database directory safely. Verify
1142 : * it's there and looks reasonable.
1143 : */
1144 31528 : fullpath = GetDatabasePath(MyDatabaseId, MyDatabaseTableSpace);
1145 :
1146 31528 : if (!bootstrap)
1147 : {
1148 31426 : if (access(fullpath, F_OK) == -1)
1149 : {
1150 0 : if (errno == ENOENT)
1151 0 : ereport(FATAL,
1152 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1153 : errmsg("database \"%s\" does not exist",
1154 : dbname),
1155 : errdetail("The database subdirectory \"%s\" is missing.",
1156 : fullpath)));
1157 : else
1158 0 : ereport(FATAL,
1159 : (errcode_for_file_access(),
1160 : errmsg("could not access directory \"%s\": %m",
1161 : fullpath)));
1162 : }
1163 :
1164 31426 : ValidatePgVersion(fullpath);
1165 : }
1166 :
1167 31528 : SetDatabasePath(fullpath);
1168 31528 : pfree(fullpath);
1169 :
1170 : /*
1171 : * It's now possible to do real access to the system catalogs.
1172 : *
1173 : * Load relcache entries for the system catalogs. This must create at
1174 : * least the minimum set of "nailed-in" cache entries.
1175 : */
1176 31528 : RelationCacheInitializePhase3();
1177 :
1178 : /* set up ACL framework (so CheckMyDatabase can check permissions) */
1179 31522 : initialize_acl();
1180 :
1181 : /*
1182 : * Re-read the pg_database row for our database, check permissions and set
1183 : * up database-specific GUC settings. We can't do this until all the
1184 : * database-access infrastructure is up. (Also, it wants to know if the
1185 : * user is a superuser, so the above stuff has to happen first.)
1186 : */
1187 31522 : if (!bootstrap)
1188 31420 : CheckMyDatabase(dbname, am_superuser,
1189 31420 : (flags & INIT_PG_OVERRIDE_ALLOW_CONNS) != 0);
1190 :
1191 : /*
1192 : * Now process any command-line switches and any additional GUC variable
1193 : * settings passed in the startup packet. We couldn't do this before
1194 : * because we didn't know if client is a superuser.
1195 : */
1196 31516 : if (MyProcPort != NULL)
1197 24192 : process_startup_options(MyProcPort, am_superuser);
1198 :
1199 : /* Process pg_db_role_setting options */
1200 31516 : process_settings(MyDatabaseId, GetSessionUserId());
1201 :
1202 : /* Apply PostAuthDelay as soon as we've read all options */
1203 31514 : if (PostAuthDelay > 0)
1204 0 : pg_usleep(PostAuthDelay * 1000000L);
1205 :
1206 : /*
1207 : * Initialize various default states that can't be set up until we've
1208 : * selected the active user and gotten the right GUC settings.
1209 : */
1210 :
1211 : /* set default namespace search path */
1212 31514 : InitializeSearchPath();
1213 :
1214 : /* initialize client encoding */
1215 31514 : InitializeClientEncoding();
1216 :
1217 : /* Initialize this backend's session state. */
1218 31514 : InitializeSession();
1219 :
1220 : /*
1221 : * If this is an interactive session, load any libraries that should be
1222 : * preloaded at backend start. Since those are determined by GUCs, this
1223 : * can't happen until GUC settings are complete, but we want it to happen
1224 : * during the initial transaction in case anything that requires database
1225 : * access needs to be done.
1226 : */
1227 31514 : if ((flags & INIT_PG_LOAD_SESSION_LIBS) != 0)
1228 22984 : process_session_preload_libraries();
1229 :
1230 : /* fill in the remainder of this entry in the PgBackendStatus array */
1231 31514 : if (!bootstrap)
1232 31412 : pgstat_bestart_final();
1233 :
1234 : /* close the transaction we started above */
1235 31514 : if (!bootstrap)
1236 31412 : CommitTransactionCommand();
1237 : }
1238 :
1239 : /*
1240 : * Process any command-line switches and any additional GUC variable
1241 : * settings passed in the startup packet.
1242 : */
1243 : static void
1244 25114 : process_startup_options(Port *port, bool am_superuser)
1245 : {
1246 : GucContext gucctx;
1247 : ListCell *gucopts;
1248 :
1249 25114 : gucctx = am_superuser ? PGC_SU_BACKEND : PGC_BACKEND;
1250 :
1251 : /*
1252 : * First process any command-line switches that were included in the
1253 : * startup packet, if we are in a regular backend.
1254 : */
1255 25114 : if (port->cmdline_options != NULL)
1256 : {
1257 : /*
1258 : * The maximum possible number of commandline arguments that could
1259 : * come from port->cmdline_options is (strlen + 1) / 2; see
1260 : * pg_split_opts().
1261 : */
1262 : char **av;
1263 : int maxac;
1264 : int ac;
1265 :
1266 7126 : maxac = 2 + (strlen(port->cmdline_options) + 1) / 2;
1267 :
1268 7126 : av = (char **) palloc(maxac * sizeof(char *));
1269 7126 : ac = 0;
1270 :
1271 7126 : av[ac++] = "postgres";
1272 :
1273 7126 : pg_split_opts(av, &ac, port->cmdline_options);
1274 :
1275 7126 : av[ac] = NULL;
1276 :
1277 : Assert(ac < maxac);
1278 :
1279 7126 : (void) process_postgres_switches(ac, av, gucctx, NULL);
1280 : }
1281 :
1282 : /*
1283 : * Process any additional GUC variable settings passed in startup packet.
1284 : * These are handled exactly like command-line variables.
1285 : */
1286 25114 : gucopts = list_head(port->guc_options);
1287 60462 : while (gucopts)
1288 : {
1289 : char *name;
1290 : char *value;
1291 :
1292 35348 : name = lfirst(gucopts);
1293 35348 : gucopts = lnext(port->guc_options, gucopts);
1294 :
1295 35348 : value = lfirst(gucopts);
1296 35348 : gucopts = lnext(port->guc_options, gucopts);
1297 :
1298 35348 : SetConfigOption(name, value, gucctx, PGC_S_CLIENT);
1299 : }
1300 25114 : }
1301 :
1302 : /*
1303 : * Load GUC settings from pg_db_role_setting.
1304 : *
1305 : * We try specific settings for the database/role combination, as well as
1306 : * general for this database and for this user.
1307 : */
1308 : static void
1309 31516 : process_settings(Oid databaseid, Oid roleid)
1310 : {
1311 : Relation relsetting;
1312 : Snapshot snapshot;
1313 :
1314 31516 : if (!IsUnderPostmaster)
1315 218 : return;
1316 :
1317 31298 : relsetting = table_open(DbRoleSettingRelationId, AccessShareLock);
1318 :
1319 : /* read all the settings under the same snapshot for efficiency */
1320 31298 : snapshot = RegisterSnapshot(GetCatalogSnapshot(DbRoleSettingRelationId));
1321 :
1322 : /* Later settings are ignored if set earlier. */
1323 31298 : ApplySetting(snapshot, databaseid, roleid, relsetting, PGC_S_DATABASE_USER);
1324 31296 : ApplySetting(snapshot, InvalidOid, roleid, relsetting, PGC_S_USER);
1325 31296 : ApplySetting(snapshot, databaseid, InvalidOid, relsetting, PGC_S_DATABASE);
1326 31296 : ApplySetting(snapshot, InvalidOid, InvalidOid, relsetting, PGC_S_GLOBAL);
1327 :
1328 31296 : UnregisterSnapshot(snapshot);
1329 31296 : table_close(relsetting, AccessShareLock);
1330 : }
1331 :
1332 : /*
1333 : * Backend-shutdown callback. Do cleanup that we want to be sure happens
1334 : * before all the supporting modules begin to nail their doors shut via
1335 : * their own callbacks.
1336 : *
1337 : * User-level cleanup, such as temp-relation removal and UNLISTEN, happens
1338 : * via separate callbacks that execute before this one. We don't combine the
1339 : * callbacks because we still want this one to happen if the user-level
1340 : * cleanup fails.
1341 : */
1342 : static void
1343 34180 : ShutdownPostgres(int code, Datum arg)
1344 : {
1345 : /* Make sure we've killed any active transaction */
1346 34180 : AbortOutOfAnyTransaction();
1347 :
1348 : /*
1349 : * User locks are not released by transaction end, so be sure to release
1350 : * them explicitly.
1351 : */
1352 34180 : LockReleaseAll(USER_LOCKMETHOD, true);
1353 34180 : }
1354 :
1355 :
1356 : /*
1357 : * STATEMENT_TIMEOUT handler: trigger a query-cancel interrupt.
1358 : */
1359 : static void
1360 12 : StatementTimeoutHandler(void)
1361 : {
1362 12 : int sig = SIGINT;
1363 :
1364 : /*
1365 : * During authentication the timeout is used to deal with
1366 : * authentication_timeout - we want to quit in response to such timeouts.
1367 : */
1368 12 : if (ClientAuthInProgress)
1369 0 : sig = SIGTERM;
1370 :
1371 : #ifdef HAVE_SETSID
1372 : /* try to signal whole process group */
1373 12 : kill(-MyProcPid, sig);
1374 : #endif
1375 12 : kill(MyProcPid, sig);
1376 12 : }
1377 :
1378 : /*
1379 : * LOCK_TIMEOUT handler: trigger a query-cancel interrupt.
1380 : */
1381 : static void
1382 8 : LockTimeoutHandler(void)
1383 : {
1384 : #ifdef HAVE_SETSID
1385 : /* try to signal whole process group */
1386 8 : kill(-MyProcPid, SIGINT);
1387 : #endif
1388 8 : kill(MyProcPid, SIGINT);
1389 8 : }
1390 :
1391 : static void
1392 2 : TransactionTimeoutHandler(void)
1393 : {
1394 2 : TransactionTimeoutPending = true;
1395 2 : InterruptPending = true;
1396 2 : SetLatch(MyLatch);
1397 2 : }
1398 :
1399 : static void
1400 2 : IdleInTransactionSessionTimeoutHandler(void)
1401 : {
1402 2 : IdleInTransactionSessionTimeoutPending = true;
1403 2 : InterruptPending = true;
1404 2 : SetLatch(MyLatch);
1405 2 : }
1406 :
1407 : static void
1408 2 : IdleSessionTimeoutHandler(void)
1409 : {
1410 2 : IdleSessionTimeoutPending = true;
1411 2 : InterruptPending = true;
1412 2 : SetLatch(MyLatch);
1413 2 : }
1414 :
1415 : static void
1416 34 : IdleStatsUpdateTimeoutHandler(void)
1417 : {
1418 34 : IdleStatsUpdateTimeoutPending = true;
1419 34 : InterruptPending = true;
1420 34 : SetLatch(MyLatch);
1421 34 : }
1422 :
1423 : static void
1424 0 : ClientCheckTimeoutHandler(void)
1425 : {
1426 0 : CheckClientConnectionPending = true;
1427 0 : InterruptPending = true;
1428 0 : SetLatch(MyLatch);
1429 0 : }
1430 :
1431 : /*
1432 : * Returns true if at least one role is defined in this database cluster.
1433 : */
1434 : static bool
1435 120 : ThereIsAtLeastOneRole(void)
1436 : {
1437 : Relation pg_authid_rel;
1438 : TableScanDesc scan;
1439 : bool result;
1440 :
1441 120 : pg_authid_rel = table_open(AuthIdRelationId, AccessShareLock);
1442 :
1443 120 : scan = table_beginscan_catalog(pg_authid_rel, 0, NULL);
1444 120 : result = (heap_getnext(scan, ForwardScanDirection) != NULL);
1445 :
1446 120 : table_endscan(scan);
1447 120 : table_close(pg_authid_rel, AccessShareLock);
1448 :
1449 120 : return result;
1450 : }
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