Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * postinit.c
4 : * postgres initialization utilities
5 : *
6 : * Portions Copyright (c) 1996-2026, 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 26606 : 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 26606 : 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 26606 : relation = table_open(DatabaseRelationId, AccessShareLock);
126 26606 : scan = systable_beginscan(relation, DatabaseNameIndexId,
127 : criticalSharedRelcachesBuilt,
128 : NULL,
129 : 1, key);
130 :
131 26606 : tuple = systable_getnext(scan);
132 :
133 : /* Must copy tuple before releasing buffer */
134 26606 : if (HeapTupleIsValid(tuple))
135 26588 : tuple = heap_copytuple(tuple);
136 :
137 : /* all done */
138 26606 : systable_endscan(scan);
139 26606 : table_close(relation, AccessShareLock);
140 :
141 26606 : return tuple;
142 : }
143 :
144 : /*
145 : * GetDatabaseTupleByOid -- as above, but search by database OID
146 : */
147 : static HeapTuple
148 33258 : 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 33258 : 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 33258 : relation = table_open(DatabaseRelationId, AccessShareLock);
169 33258 : scan = systable_beginscan(relation, DatabaseOidIndexId,
170 : criticalSharedRelcachesBuilt,
171 : NULL,
172 : 1, key);
173 :
174 33258 : tuple = systable_getnext(scan);
175 :
176 : /* Must copy tuple before releasing buffer */
177 33258 : if (HeapTupleIsValid(tuple))
178 33258 : tuple = heap_copytuple(tuple);
179 :
180 : /* all done */
181 33258 : systable_endscan(scan);
182 33258 : table_close(relation, AccessShareLock);
183 :
184 33258 : 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 27548 : PerformAuthentication(Port *port)
195 : {
196 : /* This should be set already, but let's make sure */
197 27548 : 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 27548 : 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 27548 : enable_timeout_after(STATEMENT_TIMEOUT, AuthenticationTimeout * 1000);
248 :
249 : /*
250 : * Now perform authentication exchange.
251 : */
252 27548 : set_ps_display("authentication");
253 27548 : ClientAuthentication(port); /* might not return, if failure */
254 :
255 : /*
256 : * Done with authentication. Disable the timeout, and log if needed.
257 : */
258 27414 : disable_timeout(STATEMENT_TIMEOUT, false);
259 :
260 : /* Capture authentication end time for logging */
261 27414 : conn_timing.auth_end = GetCurrentTimestamp();
262 :
263 27414 : if (log_connections & LOG_CONNECTION_AUTHORIZATION)
264 : {
265 : StringInfoData logmsg;
266 :
267 428 : initStringInfo(&logmsg);
268 428 : if (am_walsender)
269 0 : appendStringInfo(&logmsg, _("replication connection authorized: user=%s"),
270 : port->user_name);
271 : else
272 428 : appendStringInfo(&logmsg, _("connection authorized: user=%s"),
273 : port->user_name);
274 428 : if (!am_walsender)
275 428 : appendStringInfo(&logmsg, _(" database=%s"), port->database_name);
276 :
277 428 : if (port->application_name != NULL)
278 428 : appendStringInfo(&logmsg, _(" application_name=%s"),
279 : port->application_name);
280 :
281 : #ifdef USE_SSL
282 428 : if (port->ssl_in_use)
283 180 : 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 :
309 428 : ereport(LOG, errmsg_internal("%s", logmsg.data));
310 428 : pfree(logmsg.data);
311 : }
312 :
313 27414 : set_ps_display("startup");
314 :
315 27414 : ClientAuthInProgress = false; /* client_min_messages is active now */
316 27414 : }
317 :
318 :
319 : /*
320 : * CheckMyDatabase -- fetch information from the pg_database entry for our DB
321 : */
322 : static void
323 33244 : 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 33244 : tup = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(MyDatabaseId));
334 33244 : if (!HeapTupleIsValid(tup))
335 0 : elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
336 33244 : dbform = (Form_pg_database) GETSTRUCT(tup);
337 :
338 : /* This recheck is strictly paranoia */
339 33244 : 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 33244 : 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 33104 : 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 33666 : if (!am_superuser && !override_allow_connections &&
373 564 : 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 33102 : 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 33242 : SetDatabaseEncoding(dbform->encoding);
407 : /* Record it as a GUC internal option, too */
408 33242 : 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 33242 : SetConfigOption("client_encoding", GetDatabaseEncodingName(),
412 : PGC_BACKEND, PGC_S_DYNAMIC_DEFAULT);
413 :
414 : /* assign locale variables */
415 33242 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datcollate);
416 33242 : collate = TextDatumGetCString(datum);
417 33242 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datctype);
418 33242 : ctype = TextDatumGetCString(datum);
419 :
420 : /*
421 : * Historically, we set LC_COLLATE from datcollate, as well. That's no
422 : * longer necessary because all collation behavior is handled through
423 : * pg_locale_t.
424 : */
425 :
426 33242 : if (pg_perm_setlocale(LC_CTYPE, ctype) == NULL)
427 0 : ereport(FATAL,
428 : (errmsg("database locale is incompatible with operating system"),
429 : errdetail("The database was initialized with LC_CTYPE \"%s\", "
430 : " which is not recognized by setlocale().", ctype),
431 : errhint("Recreate the database with another locale or install the missing locale.")));
432 :
433 33242 : init_database_collation();
434 :
435 : /*
436 : * Check collation version. See similar code in
437 : * pg_newlocale_from_collation(). Note that here we warn instead of error
438 : * in any case, so that we don't prevent connecting.
439 : */
440 33238 : datum = SysCacheGetAttr(DATABASEOID, tup, Anum_pg_database_datcollversion,
441 : &isnull);
442 33238 : if (!isnull)
443 : {
444 : char *actual_versionstr;
445 : char *collversionstr;
446 : char *locale;
447 :
448 31538 : collversionstr = TextDatumGetCString(datum);
449 :
450 31538 : if (dbform->datlocprovider == COLLPROVIDER_LIBC)
451 29748 : locale = collate;
452 : else
453 : {
454 1790 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datlocale);
455 1790 : locale = TextDatumGetCString(datum);
456 : }
457 :
458 31538 : actual_versionstr = get_collation_actual_version(dbform->datlocprovider, locale);
459 31538 : if (!actual_versionstr)
460 : /* should not happen */
461 0 : elog(WARNING,
462 : "database \"%s\" has no actual collation version, but a version was recorded",
463 : name);
464 31538 : else if (strcmp(actual_versionstr, collversionstr) != 0)
465 0 : ereport(WARNING,
466 : (errmsg("database \"%s\" has a collation version mismatch",
467 : name),
468 : errdetail("The database was created using collation version %s, "
469 : "but the operating system provides version %s.",
470 : collversionstr, actual_versionstr),
471 : errhint("Rebuild all objects in this database that use the default collation and run "
472 : "ALTER DATABASE %s REFRESH COLLATION VERSION, "
473 : "or build PostgreSQL with the right library version.",
474 : quote_identifier(name))));
475 : }
476 :
477 33238 : ReleaseSysCache(tup);
478 33238 : }
479 :
480 :
481 : /*
482 : * pg_split_opts -- split a string of options and append it to an argv array
483 : *
484 : * The caller is responsible for ensuring the argv array is large enough. The
485 : * maximum possible number of arguments added by this routine is
486 : * (strlen(optstr) + 1) / 2.
487 : *
488 : * Because some option values can contain spaces we allow escaping using
489 : * backslashes, with \\ representing a literal backslash.
490 : */
491 : void
492 7720 : pg_split_opts(char **argv, int *argcp, const char *optstr)
493 : {
494 : StringInfoData s;
495 :
496 7720 : initStringInfo(&s);
497 :
498 28472 : while (*optstr)
499 : {
500 20752 : bool last_was_escape = false;
501 :
502 20752 : resetStringInfo(&s);
503 :
504 : /* skip over leading space */
505 39650 : while (isspace((unsigned char) *optstr))
506 18898 : optstr++;
507 :
508 20752 : if (*optstr == '\0')
509 0 : break;
510 :
511 : /*
512 : * Parse a single option, stopping at the first space, unless it's
513 : * escaped.
514 : */
515 315926 : while (*optstr)
516 : {
517 308206 : if (isspace((unsigned char) *optstr) && !last_was_escape)
518 13032 : break;
519 :
520 295174 : if (!last_was_escape && *optstr == '\\')
521 40 : last_was_escape = true;
522 : else
523 : {
524 295134 : last_was_escape = false;
525 295134 : appendStringInfoChar(&s, *optstr);
526 : }
527 :
528 295174 : optstr++;
529 : }
530 :
531 : /* now store the option in the next argv[] position */
532 20752 : argv[(*argcp)++] = pstrdup(s.data);
533 : }
534 :
535 7720 : pfree(s.data);
536 7720 : }
537 :
538 : /*
539 : * Initialize MaxBackends value from config options.
540 : *
541 : * This must be called after modules have had the chance to alter GUCs in
542 : * shared_preload_libraries and before shared memory size is determined.
543 : *
544 : * Note that in EXEC_BACKEND environment, the value is passed down from
545 : * postmaster to subprocesses via BackendParameters in SubPostmasterMain; only
546 : * postmaster itself and processes not under postmaster control should call
547 : * this.
548 : */
549 : void
550 2268 : InitializeMaxBackends(void)
551 : {
552 : Assert(MaxBackends == 0);
553 :
554 : /* Note that this does not include "auxiliary" processes */
555 2268 : MaxBackends = MaxConnections + autovacuum_worker_slots +
556 2268 : max_worker_processes + max_wal_senders + NUM_SPECIAL_WORKER_PROCS;
557 :
558 2268 : if (MaxBackends > MAX_BACKENDS)
559 0 : ereport(ERROR,
560 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
561 : errmsg("too many server processes configured"),
562 : errdetail("\"max_connections\" (%d) plus \"autovacuum_worker_slots\" (%d) plus \"max_worker_processes\" (%d) plus \"max_wal_senders\" (%d) must be less than %d.",
563 : MaxConnections, autovacuum_worker_slots,
564 : max_worker_processes, max_wal_senders,
565 : MAX_BACKENDS - (NUM_SPECIAL_WORKER_PROCS - 1))));
566 2268 : }
567 :
568 : /*
569 : * Initialize the number of fast-path lock slots in PGPROC.
570 : *
571 : * This must be called after modules have had the chance to alter GUCs in
572 : * shared_preload_libraries and before shared memory size is determined.
573 : */
574 : void
575 2268 : InitializeFastPathLocks(void)
576 : {
577 : /* Should be initialized only once. */
578 : Assert(FastPathLockGroupsPerBackend == 0);
579 :
580 : /*
581 : * Based on the max_locks_per_transaction GUC, as that's a good indicator
582 : * of the expected number of locks, figure out the value for
583 : * FastPathLockGroupsPerBackend. This must be a power-of-two. We cap the
584 : * value at FP_LOCK_GROUPS_PER_BACKEND_MAX and insist the value is at
585 : * least 1.
586 : *
587 : * The default max_locks_per_transaction = 64 means 4 groups by default.
588 : */
589 2268 : FastPathLockGroupsPerBackend =
590 2268 : Max(Min(pg_nextpower2_32(max_locks_per_xact) / FP_LOCK_SLOTS_PER_GROUP,
591 : FP_LOCK_GROUPS_PER_BACKEND_MAX), 1);
592 :
593 : /* Validate we did get a power-of-two */
594 : Assert(FastPathLockGroupsPerBackend ==
595 : pg_nextpower2_32(FastPathLockGroupsPerBackend));
596 2268 : }
597 :
598 : /*
599 : * Early initialization of a backend (either standalone or under postmaster).
600 : * This happens even before InitPostgres.
601 : *
602 : * This is separate from InitPostgres because it is also called by auxiliary
603 : * processes, such as the background writer process, which may not call
604 : * InitPostgres at all.
605 : */
606 : void
607 45496 : BaseInit(void)
608 : {
609 : Assert(MyProc != NULL);
610 :
611 : /*
612 : * Initialize our input/output/debugging file descriptors.
613 : */
614 45496 : DebugFileOpen();
615 :
616 : /*
617 : * Initialize file access. Done early so other subsystems can access
618 : * files.
619 : */
620 45496 : InitFileAccess();
621 :
622 : /*
623 : * Initialize statistics reporting. This needs to happen early to ensure
624 : * that pgstat's shutdown callback runs after the shutdown callbacks of
625 : * all subsystems that can produce stats (like e.g. transaction commits
626 : * can).
627 : */
628 45496 : pgstat_initialize();
629 :
630 : /*
631 : * Initialize AIO before infrastructure that might need to actually
632 : * execute AIO.
633 : */
634 45496 : pgaio_init_backend();
635 :
636 : /* Do local initialization of storage and buffer managers */
637 45496 : InitSync();
638 45496 : smgrinit();
639 45496 : InitBufferManagerAccess();
640 :
641 : /*
642 : * Initialize temporary file access after pgstat, so that the temporary
643 : * file shutdown hook can report temporary file statistics.
644 : */
645 45496 : InitTemporaryFileAccess();
646 :
647 : /*
648 : * Initialize local buffers for WAL record construction, in case we ever
649 : * try to insert XLOG.
650 : */
651 45496 : InitXLogInsert();
652 :
653 : /* Initialize lock manager's local structs */
654 45496 : InitLockManagerAccess();
655 :
656 : /* Initialize logical info WAL logging state */
657 45496 : InitializeProcessXLogLogicalInfo();
658 :
659 : /*
660 : * Initialize replication slots after pgstat. The exit hook might need to
661 : * drop ephemeral slots, which in turn triggers stats reporting.
662 : */
663 45496 : ReplicationSlotInitialize();
664 45496 : }
665 :
666 :
667 : /* --------------------------------
668 : * InitPostgres
669 : * Initialize POSTGRES.
670 : *
671 : * Parameters:
672 : * in_dbname, dboid: specify database to connect to, as described below
673 : * username, useroid: specify role to connect as, as described below
674 : * flags:
675 : * - INIT_PG_LOAD_SESSION_LIBS to honor [session|local]_preload_libraries.
676 : * - INIT_PG_OVERRIDE_ALLOW_CONNS to connect despite !datallowconn.
677 : * - INIT_PG_OVERRIDE_ROLE_LOGIN to connect despite !rolcanlogin.
678 : * out_dbname: optional output parameter, see below; pass NULL if not used
679 : *
680 : * The database can be specified by name, using the in_dbname parameter, or by
681 : * OID, using the dboid parameter. Specify NULL or InvalidOid respectively
682 : * for the unused parameter. If dboid is provided, the actual database
683 : * name can be returned to the caller in out_dbname. If out_dbname isn't
684 : * NULL, it must point to a buffer of size NAMEDATALEN.
685 : *
686 : * Similarly, the role can be passed by name, using the username parameter,
687 : * or by OID using the useroid parameter.
688 : *
689 : * In bootstrap mode the database and username parameters are NULL/InvalidOid.
690 : * The autovacuum launcher process doesn't specify these parameters either,
691 : * because it only goes far enough to be able to read pg_database; it doesn't
692 : * connect to any particular database. An autovacuum worker specifies a
693 : * database but not a username; conversely, a physical walsender specifies
694 : * username but not database.
695 : *
696 : * By convention, INIT_PG_LOAD_SESSION_LIBS should be passed in "flags" in
697 : * "interactive" sessions (including standalone backends), but not in
698 : * background processes such as autovacuum. Note in particular that it
699 : * shouldn't be true in parallel worker processes; those have another
700 : * mechanism for replicating their leader's set of loaded libraries.
701 : *
702 : * We expect that InitProcess() was already called, so we already have a
703 : * PGPROC struct ... but it's not completely filled in yet.
704 : *
705 : * Note:
706 : * Be very careful with the order of calls in the InitPostgres function.
707 : * --------------------------------
708 : */
709 : void
710 36198 : InitPostgres(const char *in_dbname, Oid dboid,
711 : const char *username, Oid useroid,
712 : bits32 flags,
713 : char *out_dbname)
714 : {
715 36198 : bool bootstrap = IsBootstrapProcessingMode();
716 : bool am_superuser;
717 : char *fullpath;
718 : char dbname[NAMEDATALEN];
719 36198 : int nfree = 0;
720 :
721 36198 : elog(DEBUG3, "InitPostgres");
722 :
723 : /*
724 : * Add my PGPROC struct to the ProcArray.
725 : *
726 : * Once I have done this, I am visible to other backends!
727 : */
728 36198 : InitProcessPhase2();
729 :
730 : /* Initialize status reporting */
731 36198 : pgstat_beinit();
732 :
733 : /*
734 : * And initialize an entry in the PgBackendStatus array. That way, if
735 : * LWLocks or third-party authentication should happen to hang, it is
736 : * possible to retrieve some information about what is going on.
737 : */
738 36198 : if (!bootstrap)
739 : {
740 36096 : pgstat_bestart_initial();
741 36096 : INJECTION_POINT("init-pre-auth", NULL);
742 : }
743 :
744 : /*
745 : * Initialize my entry in the shared-invalidation manager's array of
746 : * per-backend data.
747 : */
748 36198 : SharedInvalBackendInit(false);
749 :
750 36198 : ProcSignalInit(MyCancelKey, MyCancelKeyLength);
751 :
752 : /*
753 : * Also set up timeout handlers needed for backend operation. We need
754 : * these in every case except bootstrap.
755 : */
756 36198 : if (!bootstrap)
757 : {
758 36096 : RegisterTimeout(DEADLOCK_TIMEOUT, CheckDeadLockAlert);
759 36096 : RegisterTimeout(STATEMENT_TIMEOUT, StatementTimeoutHandler);
760 36096 : RegisterTimeout(LOCK_TIMEOUT, LockTimeoutHandler);
761 36096 : RegisterTimeout(IDLE_IN_TRANSACTION_SESSION_TIMEOUT,
762 : IdleInTransactionSessionTimeoutHandler);
763 36096 : RegisterTimeout(TRANSACTION_TIMEOUT, TransactionTimeoutHandler);
764 36096 : RegisterTimeout(IDLE_SESSION_TIMEOUT, IdleSessionTimeoutHandler);
765 36096 : RegisterTimeout(CLIENT_CONNECTION_CHECK_TIMEOUT, ClientCheckTimeoutHandler);
766 36096 : RegisterTimeout(IDLE_STATS_UPDATE_TIMEOUT,
767 : IdleStatsUpdateTimeoutHandler);
768 : }
769 :
770 : /*
771 : * If this is either a bootstrap process or a standalone backend, start up
772 : * the XLOG machinery, and register to have it closed down at exit. In
773 : * other cases, the startup process is responsible for starting up the
774 : * XLOG machinery, and the checkpointer for closing it down.
775 : */
776 36198 : if (!IsUnderPostmaster)
777 : {
778 : /*
779 : * We don't yet have an aux-process resource owner, but StartupXLOG
780 : * and ShutdownXLOG will need one. Hence, create said resource owner
781 : * (and register a callback to clean it up after ShutdownXLOG runs).
782 : */
783 242 : CreateAuxProcessResourceOwner();
784 :
785 242 : StartupXLOG();
786 : /* Release (and warn about) any buffer pins leaked in StartupXLOG */
787 242 : ReleaseAuxProcessResources(true);
788 : /* Reset CurrentResourceOwner to nothing for the moment */
789 242 : CurrentResourceOwner = NULL;
790 :
791 : /*
792 : * Use before_shmem_exit() so that ShutdownXLOG() can rely on DSM
793 : * segments etc to work (which in turn is required for pgstats).
794 : */
795 242 : before_shmem_exit(pgstat_before_server_shutdown, 0);
796 242 : before_shmem_exit(ShutdownXLOG, 0);
797 : }
798 :
799 : /*
800 : * Initialize the relation cache and the system catalog caches. Note that
801 : * no catalog access happens here; we only set up the hashtable structure.
802 : * We must do this before starting a transaction because transaction abort
803 : * would try to touch these hashtables.
804 : */
805 36198 : RelationCacheInitialize();
806 36198 : InitCatalogCache();
807 36198 : InitPlanCache();
808 :
809 : /* Initialize portal manager */
810 36198 : EnablePortalManager();
811 :
812 : /*
813 : * Load relcache entries for the shared system catalogs. This must create
814 : * at least entries for pg_database and catalogs used for authentication.
815 : */
816 36198 : RelationCacheInitializePhase2();
817 :
818 : /*
819 : * Set up process-exit callback to do pre-shutdown cleanup. This is one
820 : * of the first before_shmem_exit callbacks we register; thus, this will
821 : * be one of the last things we do before low-level modules like the
822 : * buffer manager begin to close down. We need to have this in place
823 : * before we begin our first transaction --- if we fail during the
824 : * initialization transaction, as is entirely possible, we need the
825 : * AbortTransaction call to clean up.
826 : */
827 36198 : before_shmem_exit(ShutdownPostgres, 0);
828 :
829 : /* The autovacuum launcher is done here */
830 36198 : if (AmAutoVacuumLauncherProcess())
831 : {
832 : /* fill in the remainder of this entry in the PgBackendStatus array */
833 830 : pgstat_bestart_final();
834 :
835 2670 : return;
836 : }
837 :
838 : /*
839 : * Start a new transaction here before first access to db.
840 : */
841 35368 : if (!bootstrap)
842 : {
843 : /* statement_timestamp must be set for timeouts to work correctly */
844 35266 : SetCurrentStatementStartTimestamp();
845 35266 : StartTransactionCommand();
846 :
847 : /*
848 : * transaction_isolation will have been set to the default by the
849 : * above. If the default is "serializable", and we are in hot
850 : * standby, we will fail if we don't change it to something lower.
851 : * Fortunately, "read committed" is plenty good enough.
852 : */
853 35266 : XactIsoLevel = XACT_READ_COMMITTED;
854 : }
855 :
856 : /*
857 : * Perform client authentication if necessary, then figure out our
858 : * postgres user ID, and see if we are a superuser.
859 : *
860 : * In standalone mode, autovacuum worker processes and slot sync worker
861 : * process, we use a fixed ID, otherwise we figure it out from the
862 : * authenticated user name.
863 : */
864 35368 : if (bootstrap || AmAutoVacuumWorkerProcess() || AmLogicalSlotSyncWorkerProcess())
865 : {
866 2756 : InitializeSessionUserIdStandalone();
867 2756 : am_superuser = true;
868 : }
869 32612 : else if (!IsUnderPostmaster)
870 : {
871 140 : InitializeSessionUserIdStandalone();
872 140 : am_superuser = true;
873 140 : if (!ThereIsAtLeastOneRole())
874 0 : ereport(WARNING,
875 : (errcode(ERRCODE_UNDEFINED_OBJECT),
876 : errmsg("no roles are defined in this database system"),
877 : errhint("You should immediately run CREATE USER \"%s\" SUPERUSER;.",
878 : username != NULL ? username : "postgres")));
879 : }
880 32472 : else if (AmBackgroundWorkerProcess())
881 : {
882 4924 : if (username == NULL && !OidIsValid(useroid))
883 : {
884 910 : InitializeSessionUserIdStandalone();
885 910 : am_superuser = true;
886 : }
887 : else
888 : {
889 4014 : InitializeSessionUserId(username, useroid,
890 4014 : (flags & INIT_PG_OVERRIDE_ROLE_LOGIN) != 0);
891 4010 : am_superuser = superuser();
892 : }
893 : }
894 : else
895 : {
896 : /* normal multiuser case */
897 : Assert(MyProcPort != NULL);
898 27548 : PerformAuthentication(MyProcPort);
899 27414 : InitializeSessionUserId(username, useroid, false);
900 : /* ensure that auth_method is actually valid, aka authn_id is not NULL */
901 27406 : if (MyClientConnectionInfo.authn_id)
902 246 : InitializeSystemUser(MyClientConnectionInfo.authn_id,
903 : hba_authname(MyClientConnectionInfo.auth_method));
904 27406 : am_superuser = superuser();
905 : }
906 :
907 : /* Report any SSL/GSS details for the session. */
908 35222 : if (MyProcPort != NULL)
909 : {
910 : Assert(!bootstrap);
911 :
912 27406 : pgstat_bestart_security();
913 : }
914 :
915 : /*
916 : * Binary upgrades only allowed super-user connections
917 : */
918 35222 : if (IsBinaryUpgrade && !am_superuser)
919 : {
920 0 : ereport(FATAL,
921 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
922 : errmsg("must be superuser to connect in binary upgrade mode")));
923 : }
924 :
925 : /*
926 : * The last few regular connection slots are reserved for superusers and
927 : * roles with privileges of pg_use_reserved_connections. We do not apply
928 : * these limits to background processes, since they all have their own
929 : * pools of PGPROC slots.
930 : *
931 : * Note: At this point, the new backend has already claimed a proc struct,
932 : * so we must check whether the number of free slots is strictly less than
933 : * the reserved connection limits.
934 : */
935 35222 : if (AmRegularBackendProcess() && !am_superuser &&
936 502 : (SuperuserReservedConnections + ReservedConnections) > 0 &&
937 502 : !HaveNFreeProcs(SuperuserReservedConnections + ReservedConnections, &nfree))
938 : {
939 8 : if (nfree < SuperuserReservedConnections)
940 2 : ereport(FATAL,
941 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
942 : errmsg("remaining connection slots are reserved for roles with the %s attribute",
943 : "SUPERUSER")));
944 :
945 6 : if (!has_privs_of_role(GetUserId(), ROLE_PG_USE_RESERVED_CONNECTIONS))
946 2 : ereport(FATAL,
947 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
948 : errmsg("remaining connection slots are reserved for roles with privileges of the \"%s\" role",
949 : "pg_use_reserved_connections")));
950 : }
951 :
952 : /* Check replication permissions needed for walsender processes. */
953 35218 : if (am_walsender)
954 : {
955 : Assert(!bootstrap);
956 :
957 2420 : if (!has_rolreplication(GetUserId()))
958 0 : ereport(FATAL,
959 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
960 : errmsg("permission denied to start WAL sender"),
961 : errdetail("Only roles with the %s attribute may start a WAL sender process.",
962 : "REPLICATION")));
963 : }
964 :
965 : /*
966 : * If this is a plain walsender only supporting physical replication, we
967 : * don't want to connect to any particular database. Just finish the
968 : * backend startup by processing any options from the startup packet, and
969 : * we're done.
970 : */
971 35218 : if (am_walsender && !am_db_walsender)
972 : {
973 : /* process any options passed in the startup packet */
974 944 : if (MyProcPort != NULL)
975 944 : process_startup_options(MyProcPort, am_superuser);
976 :
977 : /* Apply PostAuthDelay as soon as we've read all options */
978 944 : if (PostAuthDelay > 0)
979 0 : pg_usleep(PostAuthDelay * 1000000L);
980 :
981 : /* initialize client encoding */
982 944 : InitializeClientEncoding();
983 :
984 : /* fill in the remainder of this entry in the PgBackendStatus array */
985 944 : pgstat_bestart_final();
986 :
987 : /* close the transaction we started above */
988 944 : CommitTransactionCommand();
989 :
990 944 : return;
991 : }
992 :
993 : /*
994 : * Set up the global variables holding database id and default tablespace.
995 : * But note we won't actually try to touch the database just yet.
996 : *
997 : * We take a shortcut in the bootstrap case, otherwise we have to look up
998 : * the db's entry in pg_database.
999 : */
1000 34274 : if (bootstrap)
1001 : {
1002 102 : dboid = Template1DbOid;
1003 102 : MyDatabaseTableSpace = DEFAULTTABLESPACE_OID;
1004 : }
1005 34172 : else if (in_dbname != NULL)
1006 : {
1007 : HeapTuple tuple;
1008 : Form_pg_database dbform;
1009 :
1010 26606 : tuple = GetDatabaseTuple(in_dbname);
1011 26606 : if (!HeapTupleIsValid(tuple))
1012 18 : ereport(FATAL,
1013 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1014 : errmsg("database \"%s\" does not exist", in_dbname)));
1015 26588 : dbform = (Form_pg_database) GETSTRUCT(tuple);
1016 26588 : dboid = dbform->oid;
1017 : }
1018 7566 : else if (!OidIsValid(dboid))
1019 : {
1020 : /*
1021 : * If this is a background worker not bound to any particular
1022 : * database, we're done now. Everything that follows only makes sense
1023 : * if we are bound to a specific database. We do need to close the
1024 : * transaction we started before returning.
1025 : */
1026 896 : if (!bootstrap)
1027 : {
1028 896 : pgstat_bestart_final();
1029 896 : CommitTransactionCommand();
1030 : }
1031 896 : return;
1032 : }
1033 :
1034 : /*
1035 : * Now, take a writer's lock on the database we are trying to connect to.
1036 : * If there is a concurrently running DROP DATABASE on that database, this
1037 : * will block us until it finishes (and has committed its update of
1038 : * pg_database).
1039 : *
1040 : * Note that the lock is not held long, only until the end of this startup
1041 : * transaction. This is OK since we will advertise our use of the
1042 : * database in the ProcArray before dropping the lock (in fact, that's the
1043 : * next thing to do). Anyone trying a DROP DATABASE after this point will
1044 : * see us in the array once they have the lock. Ordering is important for
1045 : * this because we don't want to advertise ourselves as being in this
1046 : * database until we have the lock; otherwise we create what amounts to a
1047 : * deadlock with CountOtherDBBackends().
1048 : *
1049 : * Note: use of RowExclusiveLock here is reasonable because we envision
1050 : * our session as being a concurrent writer of the database. If we had a
1051 : * way of declaring a session as being guaranteed-read-only, we could use
1052 : * AccessShareLock for such sessions and thereby not conflict against
1053 : * CREATE DATABASE.
1054 : */
1055 33360 : if (!bootstrap)
1056 33258 : LockSharedObject(DatabaseRelationId, dboid, 0, RowExclusiveLock);
1057 :
1058 : /*
1059 : * Recheck pg_database to make sure the target database hasn't gone away.
1060 : * If there was a concurrent DROP DATABASE, this ensures we will die
1061 : * cleanly without creating a mess.
1062 : */
1063 33360 : if (!bootstrap)
1064 : {
1065 : HeapTuple tuple;
1066 : Form_pg_database datform;
1067 :
1068 33258 : tuple = GetDatabaseTupleByOid(dboid);
1069 33258 : if (HeapTupleIsValid(tuple))
1070 33258 : datform = (Form_pg_database) GETSTRUCT(tuple);
1071 :
1072 33258 : if (!HeapTupleIsValid(tuple) ||
1073 26588 : (in_dbname && namestrcmp(&datform->datname, in_dbname)))
1074 : {
1075 0 : if (in_dbname)
1076 0 : ereport(FATAL,
1077 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1078 : errmsg("database \"%s\" does not exist", in_dbname),
1079 : errdetail("It seems to have just been dropped or renamed.")));
1080 : else
1081 0 : ereport(FATAL,
1082 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1083 : errmsg("database %u does not exist", dboid)));
1084 : }
1085 :
1086 33258 : strlcpy(dbname, NameStr(datform->datname), sizeof(dbname));
1087 :
1088 33258 : if (database_is_invalid_form(datform))
1089 : {
1090 10 : ereport(FATAL,
1091 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1092 : errmsg("cannot connect to invalid database \"%s\"", dbname),
1093 : errhint("Use DROP DATABASE to drop invalid databases."));
1094 : }
1095 :
1096 33248 : MyDatabaseTableSpace = datform->dattablespace;
1097 33248 : MyDatabaseHasLoginEventTriggers = datform->dathasloginevt;
1098 : /* pass the database name back to the caller */
1099 33248 : if (out_dbname)
1100 2646 : strcpy(out_dbname, dbname);
1101 : }
1102 :
1103 : /*
1104 : * Now that we rechecked, we are certain to be connected to a database and
1105 : * thus can set MyDatabaseId.
1106 : *
1107 : * It is important that MyDatabaseId only be set once we are sure that the
1108 : * target database can no longer be concurrently dropped or renamed. For
1109 : * example, without this guarantee, pgstat_update_dbstats() could create
1110 : * entries for databases that were just dropped in the pgstat shutdown
1111 : * callback, which could confuse other code paths like the autovacuum
1112 : * scheduler.
1113 : */
1114 33350 : MyDatabaseId = dboid;
1115 :
1116 : /*
1117 : * Now we can mark our PGPROC entry with the database ID.
1118 : *
1119 : * We assume this is an atomic store so no lock is needed; though actually
1120 : * things would work fine even if it weren't atomic. Anyone searching the
1121 : * ProcArray for this database's ID should hold the database lock, so they
1122 : * would not be executing concurrently with this store. A process looking
1123 : * for another database's ID could in theory see a chance match if it read
1124 : * a partially-updated databaseId value; but as long as all such searches
1125 : * wait and retry, as in CountOtherDBBackends(), they will certainly see
1126 : * the correct value on their next try.
1127 : */
1128 33350 : MyProc->databaseId = MyDatabaseId;
1129 :
1130 : /*
1131 : * We established a catalog snapshot while reading pg_authid and/or
1132 : * pg_database; but until we have set up MyDatabaseId, we won't react to
1133 : * incoming sinval messages for unshared catalogs, so we won't realize it
1134 : * if the snapshot has been invalidated. Assume it's no good anymore.
1135 : */
1136 33350 : InvalidateCatalogSnapshot();
1137 :
1138 : /*
1139 : * Now we should be able to access the database directory safely. Verify
1140 : * it's there and looks reasonable.
1141 : */
1142 33350 : fullpath = GetDatabasePath(MyDatabaseId, MyDatabaseTableSpace);
1143 :
1144 33350 : if (!bootstrap)
1145 : {
1146 33248 : if (access(fullpath, F_OK) == -1)
1147 : {
1148 0 : if (errno == ENOENT)
1149 0 : ereport(FATAL,
1150 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1151 : errmsg("database \"%s\" does not exist",
1152 : dbname),
1153 : errdetail("The database subdirectory \"%s\" is missing.",
1154 : fullpath)));
1155 : else
1156 0 : ereport(FATAL,
1157 : (errcode_for_file_access(),
1158 : errmsg("could not access directory \"%s\": %m",
1159 : fullpath)));
1160 : }
1161 :
1162 33248 : ValidatePgVersion(fullpath);
1163 : }
1164 :
1165 33350 : SetDatabasePath(fullpath);
1166 33350 : pfree(fullpath);
1167 :
1168 : /*
1169 : * It's now possible to do real access to the system catalogs.
1170 : *
1171 : * Load relcache entries for the system catalogs. This must create at
1172 : * least the minimum set of "nailed-in" cache entries.
1173 : */
1174 33350 : RelationCacheInitializePhase3();
1175 :
1176 : /* set up ACL framework (so CheckMyDatabase can check permissions) */
1177 33346 : initialize_acl();
1178 :
1179 : /*
1180 : * Re-read the pg_database row for our database, check permissions and set
1181 : * up database-specific GUC settings. We can't do this until all the
1182 : * database-access infrastructure is up. (Also, it wants to know if the
1183 : * user is a superuser, so the above stuff has to happen first.)
1184 : */
1185 33346 : if (!bootstrap)
1186 33244 : CheckMyDatabase(dbname, am_superuser,
1187 33244 : (flags & INIT_PG_OVERRIDE_ALLOW_CONNS) != 0);
1188 :
1189 : /*
1190 : * Now process any command-line switches and any additional GUC variable
1191 : * settings passed in the startup packet. We couldn't do this before
1192 : * because we didn't know if client is a superuser.
1193 : */
1194 33340 : if (MyProcPort != NULL)
1195 26430 : process_startup_options(MyProcPort, am_superuser);
1196 :
1197 : /* Process pg_db_role_setting options */
1198 33340 : process_settings(MyDatabaseId, GetSessionUserId());
1199 :
1200 : /* Apply PostAuthDelay as soon as we've read all options */
1201 33338 : if (PostAuthDelay > 0)
1202 0 : pg_usleep(PostAuthDelay * 1000000L);
1203 :
1204 : /*
1205 : * Initialize various default states that can't be set up until we've
1206 : * selected the active user and gotten the right GUC settings.
1207 : */
1208 :
1209 : /* set default namespace search path */
1210 33338 : InitializeSearchPath();
1211 :
1212 : /* initialize client encoding */
1213 33338 : InitializeClientEncoding();
1214 :
1215 : /* Initialize this backend's session state. */
1216 33338 : InitializeSession();
1217 :
1218 : /*
1219 : * If this is an interactive session, load any libraries that should be
1220 : * preloaded at backend start. Since those are determined by GUCs, this
1221 : * can't happen until GUC settings are complete, but we want it to happen
1222 : * during the initial transaction in case anything that requires database
1223 : * access needs to be done.
1224 : */
1225 33338 : if ((flags & INIT_PG_LOAD_SESSION_LIBS) != 0)
1226 25090 : process_session_preload_libraries();
1227 :
1228 : /* fill in the remainder of this entry in the PgBackendStatus array */
1229 33338 : if (!bootstrap)
1230 33236 : pgstat_bestart_final();
1231 :
1232 : /* close the transaction we started above */
1233 33338 : if (!bootstrap)
1234 33236 : CommitTransactionCommand();
1235 : }
1236 :
1237 : /*
1238 : * Process any command-line switches and any additional GUC variable
1239 : * settings passed in the startup packet.
1240 : */
1241 : static void
1242 27374 : process_startup_options(Port *port, bool am_superuser)
1243 : {
1244 : GucContext gucctx;
1245 : ListCell *gucopts;
1246 :
1247 27374 : gucctx = am_superuser ? PGC_SU_BACKEND : PGC_BACKEND;
1248 :
1249 : /*
1250 : * First process any command-line switches that were included in the
1251 : * startup packet, if we are in a regular backend.
1252 : */
1253 27374 : if (port->cmdline_options != NULL)
1254 : {
1255 : /*
1256 : * The maximum possible number of commandline arguments that could
1257 : * come from port->cmdline_options is (strlen + 1) / 2; see
1258 : * pg_split_opts().
1259 : */
1260 : char **av;
1261 : int maxac;
1262 : int ac;
1263 :
1264 7720 : maxac = 2 + (strlen(port->cmdline_options) + 1) / 2;
1265 :
1266 7720 : av = palloc_array(char *, maxac);
1267 7720 : ac = 0;
1268 :
1269 7720 : av[ac++] = "postgres";
1270 :
1271 7720 : pg_split_opts(av, &ac, port->cmdline_options);
1272 :
1273 7720 : av[ac] = NULL;
1274 :
1275 : Assert(ac < maxac);
1276 :
1277 7720 : (void) process_postgres_switches(ac, av, gucctx, NULL);
1278 : }
1279 :
1280 : /*
1281 : * Process any additional GUC variable settings passed in startup packet.
1282 : * These are handled exactly like command-line variables.
1283 : */
1284 27374 : gucopts = list_head(port->guc_options);
1285 65500 : while (gucopts)
1286 : {
1287 : char *name;
1288 : char *value;
1289 :
1290 38126 : name = lfirst(gucopts);
1291 38126 : gucopts = lnext(port->guc_options, gucopts);
1292 :
1293 38126 : value = lfirst(gucopts);
1294 38126 : gucopts = lnext(port->guc_options, gucopts);
1295 :
1296 38126 : SetConfigOption(name, value, gucctx, PGC_S_CLIENT);
1297 : }
1298 27374 : }
1299 :
1300 : /*
1301 : * Load GUC settings from pg_db_role_setting.
1302 : *
1303 : * We try specific settings for the database/role combination, as well as
1304 : * general for this database and for this user.
1305 : */
1306 : static void
1307 33340 : process_settings(Oid databaseid, Oid roleid)
1308 : {
1309 : Relation relsetting;
1310 : Snapshot snapshot;
1311 :
1312 33340 : if (!IsUnderPostmaster)
1313 238 : return;
1314 :
1315 33102 : relsetting = table_open(DbRoleSettingRelationId, AccessShareLock);
1316 :
1317 : /* read all the settings under the same snapshot for efficiency */
1318 33102 : snapshot = RegisterSnapshot(GetCatalogSnapshot(DbRoleSettingRelationId));
1319 :
1320 : /* Later settings are ignored if set earlier. */
1321 33102 : ApplySetting(snapshot, databaseid, roleid, relsetting, PGC_S_DATABASE_USER);
1322 33100 : ApplySetting(snapshot, InvalidOid, roleid, relsetting, PGC_S_USER);
1323 33100 : ApplySetting(snapshot, databaseid, InvalidOid, relsetting, PGC_S_DATABASE);
1324 33100 : ApplySetting(snapshot, InvalidOid, InvalidOid, relsetting, PGC_S_GLOBAL);
1325 :
1326 33100 : UnregisterSnapshot(snapshot);
1327 33100 : table_close(relsetting, AccessShareLock);
1328 : }
1329 :
1330 : /*
1331 : * Backend-shutdown callback. Do cleanup that we want to be sure happens
1332 : * before all the supporting modules begin to nail their doors shut via
1333 : * their own callbacks.
1334 : *
1335 : * User-level cleanup, such as temp-relation removal and UNLISTEN, happens
1336 : * via separate callbacks that execute before this one. We don't combine the
1337 : * callbacks because we still want this one to happen if the user-level
1338 : * cleanup fails.
1339 : */
1340 : static void
1341 36198 : ShutdownPostgres(int code, Datum arg)
1342 : {
1343 : /* Make sure we've killed any active transaction */
1344 36198 : AbortOutOfAnyTransaction();
1345 :
1346 : /*
1347 : * User locks are not released by transaction end, so be sure to release
1348 : * them explicitly.
1349 : */
1350 36198 : LockReleaseAll(USER_LOCKMETHOD, true);
1351 36198 : }
1352 :
1353 :
1354 : /*
1355 : * STATEMENT_TIMEOUT handler: trigger a query-cancel interrupt.
1356 : */
1357 : static void
1358 12 : StatementTimeoutHandler(void)
1359 : {
1360 12 : int sig = SIGINT;
1361 :
1362 : /*
1363 : * During authentication the timeout is used to deal with
1364 : * authentication_timeout - we want to quit in response to such timeouts.
1365 : */
1366 12 : if (ClientAuthInProgress)
1367 0 : sig = SIGTERM;
1368 :
1369 : #ifdef HAVE_SETSID
1370 : /* try to signal whole process group */
1371 12 : kill(-MyProcPid, sig);
1372 : #endif
1373 12 : kill(MyProcPid, sig);
1374 12 : }
1375 :
1376 : /*
1377 : * LOCK_TIMEOUT handler: trigger a query-cancel interrupt.
1378 : */
1379 : static void
1380 8 : LockTimeoutHandler(void)
1381 : {
1382 : #ifdef HAVE_SETSID
1383 : /* try to signal whole process group */
1384 8 : kill(-MyProcPid, SIGINT);
1385 : #endif
1386 8 : kill(MyProcPid, SIGINT);
1387 8 : }
1388 :
1389 : static void
1390 2 : TransactionTimeoutHandler(void)
1391 : {
1392 2 : TransactionTimeoutPending = true;
1393 2 : InterruptPending = true;
1394 2 : SetLatch(MyLatch);
1395 2 : }
1396 :
1397 : static void
1398 2 : IdleInTransactionSessionTimeoutHandler(void)
1399 : {
1400 2 : IdleInTransactionSessionTimeoutPending = true;
1401 2 : InterruptPending = true;
1402 2 : SetLatch(MyLatch);
1403 2 : }
1404 :
1405 : static void
1406 2 : IdleSessionTimeoutHandler(void)
1407 : {
1408 2 : IdleSessionTimeoutPending = true;
1409 2 : InterruptPending = true;
1410 2 : SetLatch(MyLatch);
1411 2 : }
1412 :
1413 : static void
1414 30 : IdleStatsUpdateTimeoutHandler(void)
1415 : {
1416 30 : IdleStatsUpdateTimeoutPending = true;
1417 30 : InterruptPending = true;
1418 30 : SetLatch(MyLatch);
1419 30 : }
1420 :
1421 : static void
1422 0 : ClientCheckTimeoutHandler(void)
1423 : {
1424 0 : CheckClientConnectionPending = true;
1425 0 : InterruptPending = true;
1426 0 : SetLatch(MyLatch);
1427 0 : }
1428 :
1429 : /*
1430 : * Returns true if at least one role is defined in this database cluster.
1431 : */
1432 : static bool
1433 140 : ThereIsAtLeastOneRole(void)
1434 : {
1435 : Relation pg_authid_rel;
1436 : TableScanDesc scan;
1437 : bool result;
1438 :
1439 140 : pg_authid_rel = table_open(AuthIdRelationId, AccessShareLock);
1440 :
1441 140 : scan = table_beginscan_catalog(pg_authid_rel, 0, NULL);
1442 140 : result = (heap_getnext(scan, ForwardScanDirection) != NULL);
1443 :
1444 140 : table_endscan(scan);
1445 140 : table_close(pg_authid_rel, AccessShareLock);
1446 :
1447 140 : return result;
1448 : }
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