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 24720 : 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 24720 : 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 24720 : relation = table_open(DatabaseRelationId, AccessShareLock);
126 24720 : scan = systable_beginscan(relation, DatabaseNameIndexId,
127 : criticalSharedRelcachesBuilt,
128 : NULL,
129 : 1, key);
130 :
131 24720 : tuple = systable_getnext(scan);
132 :
133 : /* Must copy tuple before releasing buffer */
134 24720 : if (HeapTupleIsValid(tuple))
135 24700 : tuple = heap_copytuple(tuple);
136 :
137 : /* all done */
138 24720 : systable_endscan(scan);
139 24720 : table_close(relation, AccessShareLock);
140 :
141 24720 : return tuple;
142 : }
143 :
144 : /*
145 : * GetDatabaseTupleByOid -- as above, but search by database OID
146 : */
147 : static HeapTuple
148 31790 : 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 31790 : 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 31790 : relation = table_open(DatabaseRelationId, AccessShareLock);
169 31790 : scan = systable_beginscan(relation, DatabaseOidIndexId,
170 : criticalSharedRelcachesBuilt,
171 : NULL,
172 : 1, key);
173 :
174 31790 : tuple = systable_getnext(scan);
175 :
176 : /* Must copy tuple before releasing buffer */
177 31790 : if (HeapTupleIsValid(tuple))
178 31790 : tuple = heap_copytuple(tuple);
179 :
180 : /* all done */
181 31790 : systable_endscan(scan);
182 31790 : table_close(relation, AccessShareLock);
183 :
184 31790 : 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 25656 : PerformAuthentication(Port *port)
195 : {
196 : /* This should be set already, but let's make sure */
197 25656 : 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 25656 : 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 25656 : enable_timeout_after(STATEMENT_TIMEOUT, AuthenticationTimeout * 1000);
248 :
249 : /*
250 : * Now perform authentication exchange.
251 : */
252 25656 : set_ps_display("authentication");
253 25656 : ClientAuthentication(port); /* might not return, if failure */
254 :
255 : /*
256 : * Done with authentication. Disable the timeout, and log if needed.
257 : */
258 25522 : disable_timeout(STATEMENT_TIMEOUT, false);
259 :
260 : /* Capture authentication end time for logging */
261 25522 : conn_timing.auth_end = GetCurrentTimestamp();
262 :
263 25522 : if (log_connections & LOG_CONNECTION_AUTHORIZATION)
264 : {
265 : StringInfoData logmsg;
266 :
267 418 : initStringInfo(&logmsg);
268 418 : if (am_walsender)
269 0 : appendStringInfo(&logmsg, _("replication connection authorized: user=%s"),
270 : port->user_name);
271 : else
272 418 : appendStringInfo(&logmsg, _("connection authorized: user=%s"),
273 : port->user_name);
274 418 : if (!am_walsender)
275 418 : appendStringInfo(&logmsg, _(" database=%s"), port->database_name);
276 :
277 418 : if (port->application_name != NULL)
278 418 : appendStringInfo(&logmsg, _(" application_name=%s"),
279 : port->application_name);
280 :
281 : #ifdef USE_SSL
282 418 : if (port->ssl_in_use)
283 172 : 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 :
309 418 : ereport(LOG, errmsg_internal("%s", logmsg.data));
310 418 : pfree(logmsg.data);
311 : }
312 :
313 25522 : set_ps_display("startup");
314 :
315 25522 : ClientAuthInProgress = false; /* client_min_messages is active now */
316 25522 : }
317 :
318 :
319 : /*
320 : * CheckMyDatabase -- fetch information from the pg_database entry for our DB
321 : */
322 : static void
323 31774 : 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 31774 : tup = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(MyDatabaseId));
334 31774 : if (!HeapTupleIsValid(tup))
335 0 : elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
336 31774 : dbform = (Form_pg_database) GETSTRUCT(tup);
337 :
338 : /* This recheck is strictly paranoia */
339 31774 : 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 31774 : 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 31654 : 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 32196 : if (!am_superuser && !override_allow_connections &&
373 544 : 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 31652 : 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 31772 : SetDatabaseEncoding(dbform->encoding);
407 : /* Record it as a GUC internal option, too */
408 31772 : 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 31772 : SetConfigOption("client_encoding", GetDatabaseEncodingName(),
412 : PGC_BACKEND, PGC_S_DYNAMIC_DEFAULT);
413 :
414 : /* assign locale variables */
415 31772 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datcollate);
416 31772 : collate = TextDatumGetCString(datum);
417 31772 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datctype);
418 31772 : ctype = TextDatumGetCString(datum);
419 :
420 : /*
421 : * Historcally, 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 31772 : 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 31772 : if (strcmp(ctype, "C") == 0 ||
434 28910 : strcmp(ctype, "POSIX") == 0)
435 2862 : database_ctype_is_c = true;
436 :
437 31772 : init_database_collation();
438 :
439 : /*
440 : * Check collation version. See similar code in
441 : * pg_newlocale_from_collation(). Note that here we warn instead of error
442 : * in any case, so that we don't prevent connecting.
443 : */
444 31768 : datum = SysCacheGetAttr(DATABASEOID, tup, Anum_pg_database_datcollversion,
445 : &isnull);
446 31768 : if (!isnull)
447 : {
448 : char *actual_versionstr;
449 : char *collversionstr;
450 : char *locale;
451 :
452 30040 : collversionstr = TextDatumGetCString(datum);
453 :
454 30040 : if (dbform->datlocprovider == COLLPROVIDER_LIBC)
455 28298 : locale = collate;
456 : else
457 : {
458 1742 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datlocale);
459 1742 : locale = TextDatumGetCString(datum);
460 : }
461 :
462 30040 : actual_versionstr = get_collation_actual_version(dbform->datlocprovider, locale);
463 30040 : if (!actual_versionstr)
464 : /* should not happen */
465 0 : elog(WARNING,
466 : "database \"%s\" has no actual collation version, but a version was recorded",
467 : name);
468 30040 : else if (strcmp(actual_versionstr, collversionstr) != 0)
469 0 : ereport(WARNING,
470 : (errmsg("database \"%s\" has a collation version mismatch",
471 : name),
472 : errdetail("The database was created using collation version %s, "
473 : "but the operating system provides version %s.",
474 : collversionstr, actual_versionstr),
475 : errhint("Rebuild all objects in this database that use the default collation and run "
476 : "ALTER DATABASE %s REFRESH COLLATION VERSION, "
477 : "or build PostgreSQL with the right library version.",
478 : quote_identifier(name))));
479 : }
480 :
481 31768 : ReleaseSysCache(tup);
482 31768 : }
483 :
484 :
485 : /*
486 : * pg_split_opts -- split a string of options and append it to an argv array
487 : *
488 : * The caller is responsible for ensuring the argv array is large enough. The
489 : * maximum possible number of arguments added by this routine is
490 : * (strlen(optstr) + 1) / 2.
491 : *
492 : * Because some option values can contain spaces we allow escaping using
493 : * backslashes, with \\ representing a literal backslash.
494 : */
495 : void
496 7256 : pg_split_opts(char **argv, int *argcp, const char *optstr)
497 : {
498 : StringInfoData s;
499 :
500 7256 : initStringInfo(&s);
501 :
502 26684 : while (*optstr)
503 : {
504 19428 : bool last_was_escape = false;
505 :
506 19428 : resetStringInfo(&s);
507 :
508 : /* skip over leading space */
509 35968 : while (isspace((unsigned char) *optstr))
510 16540 : optstr++;
511 :
512 19428 : if (*optstr == '\0')
513 0 : break;
514 :
515 : /*
516 : * Parse a single option, stopping at the first space, unless it's
517 : * escaped.
518 : */
519 295560 : while (*optstr)
520 : {
521 288304 : if (isspace((unsigned char) *optstr) && !last_was_escape)
522 12172 : break;
523 :
524 276132 : if (!last_was_escape && *optstr == '\\')
525 28 : last_was_escape = true;
526 : else
527 : {
528 276104 : last_was_escape = false;
529 276104 : appendStringInfoChar(&s, *optstr);
530 : }
531 :
532 276132 : optstr++;
533 : }
534 :
535 : /* now store the option in the next argv[] position */
536 19428 : argv[(*argcp)++] = pstrdup(s.data);
537 : }
538 :
539 7256 : pfree(s.data);
540 7256 : }
541 :
542 : /*
543 : * Initialize MaxBackends value from config options.
544 : *
545 : * This must be called after modules have had the chance to alter GUCs in
546 : * shared_preload_libraries and before shared memory size is determined.
547 : *
548 : * Note that in EXEC_BACKEND environment, the value is passed down from
549 : * postmaster to subprocesses via BackendParameters in SubPostmasterMain; only
550 : * postmaster itself and processes not under postmaster control should call
551 : * this.
552 : */
553 : void
554 2148 : InitializeMaxBackends(void)
555 : {
556 : Assert(MaxBackends == 0);
557 :
558 : /* Note that this does not include "auxiliary" processes */
559 2148 : MaxBackends = MaxConnections + autovacuum_worker_slots +
560 2148 : max_worker_processes + max_wal_senders + NUM_SPECIAL_WORKER_PROCS;
561 :
562 2148 : if (MaxBackends > MAX_BACKENDS)
563 0 : ereport(ERROR,
564 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
565 : errmsg("too many server processes configured"),
566 : errdetail("\"max_connections\" (%d) plus \"autovacuum_worker_slots\" (%d) plus \"max_worker_processes\" (%d) plus \"max_wal_senders\" (%d) must be less than %d.",
567 : MaxConnections, autovacuum_worker_slots,
568 : max_worker_processes, max_wal_senders,
569 : MAX_BACKENDS - (NUM_SPECIAL_WORKER_PROCS - 1))));
570 2148 : }
571 :
572 : /*
573 : * Initialize the number of fast-path lock slots in PGPROC.
574 : *
575 : * This must be called after modules have had the chance to alter GUCs in
576 : * shared_preload_libraries and before shared memory size is determined.
577 : */
578 : void
579 2148 : InitializeFastPathLocks(void)
580 : {
581 : /* Should be initialized only once. */
582 : Assert(FastPathLockGroupsPerBackend == 0);
583 :
584 : /*
585 : * Based on the max_locks_per_transaction GUC, as that's a good indicator
586 : * of the expected number of locks, figure out the value for
587 : * FastPathLockGroupsPerBackend. This must be a power-of-two. We cap the
588 : * value at FP_LOCK_GROUPS_PER_BACKEND_MAX and insist the value is at
589 : * least 1.
590 : *
591 : * The default max_locks_per_transaction = 64 means 4 groups by default.
592 : */
593 2148 : FastPathLockGroupsPerBackend =
594 2148 : Max(Min(pg_nextpower2_32(max_locks_per_xact) / FP_LOCK_SLOTS_PER_GROUP,
595 : FP_LOCK_GROUPS_PER_BACKEND_MAX), 1);
596 :
597 : /* Validate we did get a power-of-two */
598 : Assert(FastPathLockGroupsPerBackend ==
599 : pg_nextpower2_32(FastPathLockGroupsPerBackend));
600 2148 : }
601 :
602 : /*
603 : * Early initialization of a backend (either standalone or under postmaster).
604 : * This happens even before InitPostgres.
605 : *
606 : * This is separate from InitPostgres because it is also called by auxiliary
607 : * processes, such as the background writer process, which may not call
608 : * InitPostgres at all.
609 : */
610 : void
611 42900 : BaseInit(void)
612 : {
613 : Assert(MyProc != NULL);
614 :
615 : /*
616 : * Initialize our input/output/debugging file descriptors.
617 : */
618 42900 : DebugFileOpen();
619 :
620 : /*
621 : * Initialize file access. Done early so other subsystems can access
622 : * files.
623 : */
624 42900 : InitFileAccess();
625 :
626 : /*
627 : * Initialize statistics reporting. This needs to happen early to ensure
628 : * that pgstat's shutdown callback runs after the shutdown callbacks of
629 : * all subsystems that can produce stats (like e.g. transaction commits
630 : * can).
631 : */
632 42900 : pgstat_initialize();
633 :
634 : /*
635 : * Initialize AIO before infrastructure that might need to actually
636 : * execute AIO.
637 : */
638 42900 : pgaio_init_backend();
639 :
640 : /* Do local initialization of storage and buffer managers */
641 42900 : InitSync();
642 42900 : smgrinit();
643 42900 : InitBufferManagerAccess();
644 :
645 : /*
646 : * Initialize temporary file access after pgstat, so that the temporary
647 : * file shutdown hook can report temporary file statistics.
648 : */
649 42900 : InitTemporaryFileAccess();
650 :
651 : /*
652 : * Initialize local buffers for WAL record construction, in case we ever
653 : * try to insert XLOG.
654 : */
655 42900 : InitXLogInsert();
656 :
657 : /* Initialize lock manager's local structs */
658 42900 : InitLockManagerAccess();
659 :
660 : /*
661 : * Initialize replication slots after pgstat. The exit hook might need to
662 : * drop ephemeral slots, which in turn triggers stats reporting.
663 : */
664 42900 : ReplicationSlotInitialize();
665 42900 : }
666 :
667 :
668 : /* --------------------------------
669 : * InitPostgres
670 : * Initialize POSTGRES.
671 : *
672 : * Parameters:
673 : * in_dbname, dboid: specify database to connect to, as described below
674 : * username, useroid: specify role to connect as, as described below
675 : * flags:
676 : * - INIT_PG_LOAD_SESSION_LIBS to honor [session|local]_preload_libraries.
677 : * - INIT_PG_OVERRIDE_ALLOW_CONNS to connect despite !datallowconn.
678 : * - INIT_PG_OVERRIDE_ROLE_LOGIN to connect despite !rolcanlogin.
679 : * out_dbname: optional output parameter, see below; pass NULL if not used
680 : *
681 : * The database can be specified by name, using the in_dbname parameter, or by
682 : * OID, using the dboid parameter. Specify NULL or InvalidOid respectively
683 : * for the unused parameter. If dboid is provided, the actual database
684 : * name can be returned to the caller in out_dbname. If out_dbname isn't
685 : * NULL, it must point to a buffer of size NAMEDATALEN.
686 : *
687 : * Similarly, the role can be passed by name, using the username parameter,
688 : * or by OID using the useroid parameter.
689 : *
690 : * In bootstrap mode the database and username parameters are NULL/InvalidOid.
691 : * The autovacuum launcher process doesn't specify these parameters either,
692 : * because it only goes far enough to be able to read pg_database; it doesn't
693 : * connect to any particular database. An autovacuum worker specifies a
694 : * database but not a username; conversely, a physical walsender specifies
695 : * username but not database.
696 : *
697 : * By convention, INIT_PG_LOAD_SESSION_LIBS should be passed in "flags" in
698 : * "interactive" sessions (including standalone backends), but not in
699 : * background processes such as autovacuum. Note in particular that it
700 : * shouldn't be true in parallel worker processes; those have another
701 : * mechanism for replicating their leader's set of loaded libraries.
702 : *
703 : * We expect that InitProcess() was already called, so we already have a
704 : * PGPROC struct ... but it's not completely filled in yet.
705 : *
706 : * Note:
707 : * Be very careful with the order of calls in the InitPostgres function.
708 : * --------------------------------
709 : */
710 : void
711 34552 : InitPostgres(const char *in_dbname, Oid dboid,
712 : const char *username, Oid useroid,
713 : bits32 flags,
714 : char *out_dbname)
715 : {
716 34552 : bool bootstrap = IsBootstrapProcessingMode();
717 : bool am_superuser;
718 : char *fullpath;
719 : char dbname[NAMEDATALEN];
720 34552 : int nfree = 0;
721 :
722 34552 : elog(DEBUG3, "InitPostgres");
723 :
724 : /*
725 : * Add my PGPROC struct to the ProcArray.
726 : *
727 : * Once I have done this, I am visible to other backends!
728 : */
729 34552 : InitProcessPhase2();
730 :
731 : /* Initialize status reporting */
732 34552 : pgstat_beinit();
733 :
734 : /*
735 : * And initialize an entry in the PgBackendStatus array. That way, if
736 : * LWLocks or third-party authentication should happen to hang, it is
737 : * possible to retrieve some information about what is going on.
738 : */
739 34552 : if (!bootstrap)
740 : {
741 34450 : pgstat_bestart_initial();
742 34450 : INJECTION_POINT("init-pre-auth", NULL);
743 : }
744 :
745 : /*
746 : * Initialize my entry in the shared-invalidation manager's array of
747 : * per-backend data.
748 : */
749 34552 : SharedInvalBackendInit(false);
750 :
751 34552 : ProcSignalInit(MyCancelKey, MyCancelKeyLength);
752 :
753 : /*
754 : * Also set up timeout handlers needed for backend operation. We need
755 : * these in every case except bootstrap.
756 : */
757 34552 : if (!bootstrap)
758 : {
759 34450 : RegisterTimeout(DEADLOCK_TIMEOUT, CheckDeadLockAlert);
760 34450 : RegisterTimeout(STATEMENT_TIMEOUT, StatementTimeoutHandler);
761 34450 : RegisterTimeout(LOCK_TIMEOUT, LockTimeoutHandler);
762 34450 : RegisterTimeout(IDLE_IN_TRANSACTION_SESSION_TIMEOUT,
763 : IdleInTransactionSessionTimeoutHandler);
764 34450 : RegisterTimeout(TRANSACTION_TIMEOUT, TransactionTimeoutHandler);
765 34450 : RegisterTimeout(IDLE_SESSION_TIMEOUT, IdleSessionTimeoutHandler);
766 34450 : RegisterTimeout(CLIENT_CONNECTION_CHECK_TIMEOUT, ClientCheckTimeoutHandler);
767 34450 : RegisterTimeout(IDLE_STATS_UPDATE_TIMEOUT,
768 : IdleStatsUpdateTimeoutHandler);
769 : }
770 :
771 : /*
772 : * If this is either a bootstrap process or a standalone backend, start up
773 : * the XLOG machinery, and register to have it closed down at exit. In
774 : * other cases, the startup process is responsible for starting up the
775 : * XLOG machinery, and the checkpointer for closing it down.
776 : */
777 34552 : if (!IsUnderPostmaster)
778 : {
779 : /*
780 : * We don't yet have an aux-process resource owner, but StartupXLOG
781 : * and ShutdownXLOG will need one. Hence, create said resource owner
782 : * (and register a callback to clean it up after ShutdownXLOG runs).
783 : */
784 222 : CreateAuxProcessResourceOwner();
785 :
786 222 : StartupXLOG();
787 : /* Release (and warn about) any buffer pins leaked in StartupXLOG */
788 222 : ReleaseAuxProcessResources(true);
789 : /* Reset CurrentResourceOwner to nothing for the moment */
790 222 : CurrentResourceOwner = NULL;
791 :
792 : /*
793 : * Use before_shmem_exit() so that ShutdownXLOG() can rely on DSM
794 : * segments etc to work (which in turn is required for pgstats).
795 : */
796 222 : before_shmem_exit(pgstat_before_server_shutdown, 0);
797 222 : before_shmem_exit(ShutdownXLOG, 0);
798 : }
799 :
800 : /*
801 : * Initialize the relation cache and the system catalog caches. Note that
802 : * no catalog access happens here; we only set up the hashtable structure.
803 : * We must do this before starting a transaction because transaction abort
804 : * would try to touch these hashtables.
805 : */
806 34552 : RelationCacheInitialize();
807 34552 : InitCatalogCache();
808 34552 : InitPlanCache();
809 :
810 : /* Initialize portal manager */
811 34552 : EnablePortalManager();
812 :
813 : /*
814 : * Load relcache entries for the shared system catalogs. This must create
815 : * at least entries for pg_database and catalogs used for authentication.
816 : */
817 34552 : RelationCacheInitializePhase2();
818 :
819 : /*
820 : * Set up process-exit callback to do pre-shutdown cleanup. This is the
821 : * one of the first before_shmem_exit callbacks we register; thus, this
822 : * will be one the last things we do before low-level modules like the
823 : * buffer manager begin to close down. We need to have this in place
824 : * before we begin our first transaction --- if we fail during the
825 : * initialization transaction, as is entirely possible, we need the
826 : * AbortTransaction call to clean up.
827 : */
828 34552 : before_shmem_exit(ShutdownPostgres, 0);
829 :
830 : /* The autovacuum launcher is done here */
831 34552 : if (AmAutoVacuumLauncherProcess())
832 : {
833 : /* fill in the remainder of this entry in the PgBackendStatus array */
834 754 : pgstat_bestart_final();
835 :
836 2490 : return;
837 : }
838 :
839 : /*
840 : * Start a new transaction here before first access to db.
841 : */
842 33798 : if (!bootstrap)
843 : {
844 : /* statement_timestamp must be set for timeouts to work correctly */
845 33696 : SetCurrentStatementStartTimestamp();
846 33696 : StartTransactionCommand();
847 :
848 : /*
849 : * transaction_isolation will have been set to the default by the
850 : * above. If the default is "serializable", and we are in hot
851 : * standby, we will fail if we don't change it to something lower.
852 : * Fortunately, "read committed" is plenty good enough.
853 : */
854 33696 : XactIsoLevel = XACT_READ_COMMITTED;
855 : }
856 :
857 : /*
858 : * Perform client authentication if necessary, then figure out our
859 : * postgres user ID, and see if we are a superuser.
860 : *
861 : * In standalone mode, autovacuum worker processes and slot sync worker
862 : * process, we use a fixed ID, otherwise we figure it out from the
863 : * authenticated user name.
864 : */
865 33798 : if (bootstrap || AmAutoVacuumWorkerProcess() || AmLogicalSlotSyncWorkerProcess())
866 : {
867 3530 : InitializeSessionUserIdStandalone();
868 3530 : am_superuser = true;
869 : }
870 30268 : else if (!IsUnderPostmaster)
871 : {
872 120 : InitializeSessionUserIdStandalone();
873 120 : am_superuser = true;
874 120 : if (!ThereIsAtLeastOneRole())
875 0 : ereport(WARNING,
876 : (errcode(ERRCODE_UNDEFINED_OBJECT),
877 : errmsg("no roles are defined in this database system"),
878 : errhint("You should immediately run CREATE USER \"%s\" SUPERUSER;.",
879 : username != NULL ? username : "postgres")));
880 : }
881 30148 : else if (AmBackgroundWorkerProcess())
882 : {
883 4492 : if (username == NULL && !OidIsValid(useroid))
884 : {
885 822 : InitializeSessionUserIdStandalone();
886 822 : am_superuser = true;
887 : }
888 : else
889 : {
890 3670 : InitializeSessionUserId(username, useroid,
891 3670 : (flags & INIT_PG_OVERRIDE_ROLE_LOGIN) != 0);
892 3666 : am_superuser = superuser();
893 : }
894 : }
895 : else
896 : {
897 : /* normal multiuser case */
898 : Assert(MyProcPort != NULL);
899 25656 : PerformAuthentication(MyProcPort);
900 25522 : InitializeSessionUserId(username, useroid, false);
901 : /* ensure that auth_method is actually valid, aka authn_id is not NULL */
902 25514 : if (MyClientConnectionInfo.authn_id)
903 246 : InitializeSystemUser(MyClientConnectionInfo.authn_id,
904 : hba_authname(MyClientConnectionInfo.auth_method));
905 25514 : am_superuser = superuser();
906 : }
907 :
908 : /* Report any SSL/GSS details for the session. */
909 33652 : if (MyProcPort != NULL)
910 : {
911 : Assert(!bootstrap);
912 :
913 25514 : pgstat_bestart_security();
914 : }
915 :
916 : /*
917 : * Binary upgrades only allowed super-user connections
918 : */
919 33652 : if (IsBinaryUpgrade && !am_superuser)
920 : {
921 0 : ereport(FATAL,
922 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
923 : errmsg("must be superuser to connect in binary upgrade mode")));
924 : }
925 :
926 : /*
927 : * The last few regular connection slots are reserved for superusers and
928 : * roles with privileges of pg_use_reserved_connections. We do not apply
929 : * these limits to background processes, since they all have their own
930 : * pools of PGPROC slots.
931 : *
932 : * Note: At this point, the new backend has already claimed a proc struct,
933 : * so we must check whether the number of free slots is strictly less than
934 : * the reserved connection limits.
935 : */
936 33652 : if (AmRegularBackendProcess() && !am_superuser &&
937 484 : (SuperuserReservedConnections + ReservedConnections) > 0 &&
938 484 : !HaveNFreeProcs(SuperuserReservedConnections + ReservedConnections, &nfree))
939 : {
940 8 : if (nfree < SuperuserReservedConnections)
941 2 : ereport(FATAL,
942 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
943 : errmsg("remaining connection slots are reserved for roles with the %s attribute",
944 : "SUPERUSER")));
945 :
946 6 : if (!has_privs_of_role(GetUserId(), ROLE_PG_USE_RESERVED_CONNECTIONS))
947 2 : ereport(FATAL,
948 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
949 : errmsg("remaining connection slots are reserved for roles with privileges of the \"%s\" role",
950 : "pg_use_reserved_connections")));
951 : }
952 :
953 : /* Check replication permissions needed for walsender processes. */
954 33648 : if (am_walsender)
955 : {
956 : Assert(!bootstrap);
957 :
958 2298 : if (!has_rolreplication(GetUserId()))
959 0 : ereport(FATAL,
960 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
961 : errmsg("permission denied to start WAL sender"),
962 : errdetail("Only roles with the %s attribute may start a WAL sender process.",
963 : "REPLICATION")));
964 : }
965 :
966 : /*
967 : * If this is a plain walsender only supporting physical replication, we
968 : * don't want to connect to any particular database. Just finish the
969 : * backend startup by processing any options from the startup packet, and
970 : * we're done.
971 : */
972 33648 : if (am_walsender && !am_db_walsender)
973 : {
974 : /* process any options passed in the startup packet */
975 918 : if (MyProcPort != NULL)
976 918 : process_startup_options(MyProcPort, am_superuser);
977 :
978 : /* Apply PostAuthDelay as soon as we've read all options */
979 918 : if (PostAuthDelay > 0)
980 0 : pg_usleep(PostAuthDelay * 1000000L);
981 :
982 : /* initialize client encoding */
983 918 : InitializeClientEncoding();
984 :
985 : /* fill in the remainder of this entry in the PgBackendStatus array */
986 918 : pgstat_bestart_final();
987 :
988 : /* close the transaction we started above */
989 918 : CommitTransactionCommand();
990 :
991 918 : return;
992 : }
993 :
994 : /*
995 : * Set up the global variables holding database id and default tablespace.
996 : * But note we won't actually try to touch the database just yet.
997 : *
998 : * We take a shortcut in the bootstrap case, otherwise we have to look up
999 : * the db's entry in pg_database.
1000 : */
1001 32730 : if (bootstrap)
1002 : {
1003 102 : dboid = Template1DbOid;
1004 102 : MyDatabaseTableSpace = DEFAULTTABLESPACE_OID;
1005 : }
1006 32628 : else if (in_dbname != NULL)
1007 : {
1008 : HeapTuple tuple;
1009 : Form_pg_database dbform;
1010 :
1011 24720 : tuple = GetDatabaseTuple(in_dbname);
1012 24720 : if (!HeapTupleIsValid(tuple))
1013 20 : ereport(FATAL,
1014 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1015 : errmsg("database \"%s\" does not exist", in_dbname)));
1016 24700 : dbform = (Form_pg_database) GETSTRUCT(tuple);
1017 24700 : dboid = dbform->oid;
1018 : }
1019 7908 : else if (!OidIsValid(dboid))
1020 : {
1021 : /*
1022 : * If this is a background worker not bound to any particular
1023 : * database, we're done now. Everything that follows only makes sense
1024 : * if we are bound to a specific database. We do need to close the
1025 : * transaction we started before returning.
1026 : */
1027 818 : if (!bootstrap)
1028 : {
1029 818 : pgstat_bestart_final();
1030 818 : CommitTransactionCommand();
1031 : }
1032 818 : return;
1033 : }
1034 :
1035 : /*
1036 : * Now, take a writer's lock on the database we are trying to connect to.
1037 : * If there is a concurrently running DROP DATABASE on that database, this
1038 : * will block us until it finishes (and has committed its update of
1039 : * pg_database).
1040 : *
1041 : * Note that the lock is not held long, only until the end of this startup
1042 : * transaction. This is OK since we will advertise our use of the
1043 : * database in the ProcArray before dropping the lock (in fact, that's the
1044 : * next thing to do). Anyone trying a DROP DATABASE after this point will
1045 : * see us in the array once they have the lock. Ordering is important for
1046 : * this because we don't want to advertise ourselves as being in this
1047 : * database until we have the lock; otherwise we create what amounts to a
1048 : * deadlock with CountOtherDBBackends().
1049 : *
1050 : * Note: use of RowExclusiveLock here is reasonable because we envision
1051 : * our session as being a concurrent writer of the database. If we had a
1052 : * way of declaring a session as being guaranteed-read-only, we could use
1053 : * AccessShareLock for such sessions and thereby not conflict against
1054 : * CREATE DATABASE.
1055 : */
1056 31892 : if (!bootstrap)
1057 31790 : LockSharedObject(DatabaseRelationId, dboid, 0, RowExclusiveLock);
1058 :
1059 : /*
1060 : * Recheck pg_database to make sure the target database hasn't gone away.
1061 : * If there was a concurrent DROP DATABASE, this ensures we will die
1062 : * cleanly without creating a mess.
1063 : */
1064 31892 : if (!bootstrap)
1065 : {
1066 : HeapTuple tuple;
1067 : Form_pg_database datform;
1068 :
1069 31790 : tuple = GetDatabaseTupleByOid(dboid);
1070 31790 : if (HeapTupleIsValid(tuple))
1071 31790 : datform = (Form_pg_database) GETSTRUCT(tuple);
1072 :
1073 31790 : if (!HeapTupleIsValid(tuple) ||
1074 24700 : (in_dbname && namestrcmp(&datform->datname, in_dbname)))
1075 : {
1076 0 : if (in_dbname)
1077 0 : ereport(FATAL,
1078 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1079 : errmsg("database \"%s\" does not exist", in_dbname),
1080 : errdetail("It seems to have just been dropped or renamed.")));
1081 : else
1082 0 : ereport(FATAL,
1083 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1084 : errmsg("database %u does not exist", dboid)));
1085 : }
1086 :
1087 31790 : strlcpy(dbname, NameStr(datform->datname), sizeof(dbname));
1088 :
1089 31790 : if (database_is_invalid_form(datform))
1090 : {
1091 12 : ereport(FATAL,
1092 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1093 : errmsg("cannot connect to invalid database \"%s\"", dbname),
1094 : errhint("Use DROP DATABASE to drop invalid databases."));
1095 : }
1096 :
1097 31778 : MyDatabaseTableSpace = datform->dattablespace;
1098 31778 : MyDatabaseHasLoginEventTriggers = datform->dathasloginevt;
1099 : /* pass the database name back to the caller */
1100 31778 : if (out_dbname)
1101 3420 : strcpy(out_dbname, dbname);
1102 : }
1103 :
1104 : /*
1105 : * Now that we rechecked, we are certain to be connected to a database and
1106 : * thus can set MyDatabaseId.
1107 : *
1108 : * It is important that MyDatabaseId only be set once we are sure that the
1109 : * target database can no longer be concurrently dropped or renamed. For
1110 : * example, without this guarantee, pgstat_update_dbstats() could create
1111 : * entries for databases that were just dropped in the pgstat shutdown
1112 : * callback, which could confuse other code paths like the autovacuum
1113 : * scheduler.
1114 : */
1115 31880 : MyDatabaseId = dboid;
1116 :
1117 : /*
1118 : * Now we can mark our PGPROC entry with the database ID.
1119 : *
1120 : * We assume this is an atomic store so no lock is needed; though actually
1121 : * things would work fine even if it weren't atomic. Anyone searching the
1122 : * ProcArray for this database's ID should hold the database lock, so they
1123 : * would not be executing concurrently with this store. A process looking
1124 : * for another database's ID could in theory see a chance match if it read
1125 : * a partially-updated databaseId value; but as long as all such searches
1126 : * wait and retry, as in CountOtherDBBackends(), they will certainly see
1127 : * the correct value on their next try.
1128 : */
1129 31880 : MyProc->databaseId = MyDatabaseId;
1130 :
1131 : /*
1132 : * We established a catalog snapshot while reading pg_authid and/or
1133 : * pg_database; but until we have set up MyDatabaseId, we won't react to
1134 : * incoming sinval messages for unshared catalogs, so we won't realize it
1135 : * if the snapshot has been invalidated. Assume it's no good anymore.
1136 : */
1137 31880 : InvalidateCatalogSnapshot();
1138 :
1139 : /*
1140 : * Now we should be able to access the database directory safely. Verify
1141 : * it's there and looks reasonable.
1142 : */
1143 31880 : fullpath = GetDatabasePath(MyDatabaseId, MyDatabaseTableSpace);
1144 :
1145 31880 : if (!bootstrap)
1146 : {
1147 31778 : if (access(fullpath, F_OK) == -1)
1148 : {
1149 0 : if (errno == ENOENT)
1150 0 : ereport(FATAL,
1151 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1152 : errmsg("database \"%s\" does not exist",
1153 : dbname),
1154 : errdetail("The database subdirectory \"%s\" is missing.",
1155 : fullpath)));
1156 : else
1157 0 : ereport(FATAL,
1158 : (errcode_for_file_access(),
1159 : errmsg("could not access directory \"%s\": %m",
1160 : fullpath)));
1161 : }
1162 :
1163 31778 : ValidatePgVersion(fullpath);
1164 : }
1165 :
1166 31880 : SetDatabasePath(fullpath);
1167 31880 : pfree(fullpath);
1168 :
1169 : /*
1170 : * It's now possible to do real access to the system catalogs.
1171 : *
1172 : * Load relcache entries for the system catalogs. This must create at
1173 : * least the minimum set of "nailed-in" cache entries.
1174 : */
1175 31880 : RelationCacheInitializePhase3();
1176 :
1177 : /* set up ACL framework (so CheckMyDatabase can check permissions) */
1178 31876 : initialize_acl();
1179 :
1180 : /*
1181 : * Re-read the pg_database row for our database, check permissions and set
1182 : * up database-specific GUC settings. We can't do this until all the
1183 : * database-access infrastructure is up. (Also, it wants to know if the
1184 : * user is a superuser, so the above stuff has to happen first.)
1185 : */
1186 31876 : if (!bootstrap)
1187 31774 : CheckMyDatabase(dbname, am_superuser,
1188 31774 : (flags & INIT_PG_OVERRIDE_ALLOW_CONNS) != 0);
1189 :
1190 : /*
1191 : * Now process any command-line switches and any additional GUC variable
1192 : * settings passed in the startup packet. We couldn't do this before
1193 : * because we didn't know if client is a superuser.
1194 : */
1195 31870 : if (MyProcPort != NULL)
1196 24560 : process_startup_options(MyProcPort, am_superuser);
1197 :
1198 : /* Process pg_db_role_setting options */
1199 31870 : process_settings(MyDatabaseId, GetSessionUserId());
1200 :
1201 : /* Apply PostAuthDelay as soon as we've read all options */
1202 31870 : if (PostAuthDelay > 0)
1203 0 : pg_usleep(PostAuthDelay * 1000000L);
1204 :
1205 : /*
1206 : * Initialize various default states that can't be set up until we've
1207 : * selected the active user and gotten the right GUC settings.
1208 : */
1209 :
1210 : /* set default namespace search path */
1211 31870 : InitializeSearchPath();
1212 :
1213 : /* initialize client encoding */
1214 31870 : InitializeClientEncoding();
1215 :
1216 : /* Initialize this backend's session state. */
1217 31870 : InitializeSession();
1218 :
1219 : /*
1220 : * If this is an interactive session, load any libraries that should be
1221 : * preloaded at backend start. Since those are determined by GUCs, this
1222 : * can't happen until GUC settings are complete, but we want it to happen
1223 : * during the initial transaction in case anything that requires database
1224 : * access needs to be done.
1225 : */
1226 31870 : if ((flags & INIT_PG_LOAD_SESSION_LIBS) != 0)
1227 23296 : process_session_preload_libraries();
1228 :
1229 : /* fill in the remainder of this entry in the PgBackendStatus array */
1230 31870 : if (!bootstrap)
1231 31768 : pgstat_bestart_final();
1232 :
1233 : /* close the transaction we started above */
1234 31870 : if (!bootstrap)
1235 31768 : CommitTransactionCommand();
1236 : }
1237 :
1238 : /*
1239 : * Process any command-line switches and any additional GUC variable
1240 : * settings passed in the startup packet.
1241 : */
1242 : static void
1243 25478 : process_startup_options(Port *port, bool am_superuser)
1244 : {
1245 : GucContext gucctx;
1246 : ListCell *gucopts;
1247 :
1248 25478 : gucctx = am_superuser ? PGC_SU_BACKEND : PGC_BACKEND;
1249 :
1250 : /*
1251 : * First process any command-line switches that were included in the
1252 : * startup packet, if we are in a regular backend.
1253 : */
1254 25478 : if (port->cmdline_options != NULL)
1255 : {
1256 : /*
1257 : * The maximum possible number of commandline arguments that could
1258 : * come from port->cmdline_options is (strlen + 1) / 2; see
1259 : * pg_split_opts().
1260 : */
1261 : char **av;
1262 : int maxac;
1263 : int ac;
1264 :
1265 7256 : maxac = 2 + (strlen(port->cmdline_options) + 1) / 2;
1266 :
1267 7256 : av = (char **) palloc(maxac * sizeof(char *));
1268 7256 : ac = 0;
1269 :
1270 7256 : av[ac++] = "postgres";
1271 :
1272 7256 : pg_split_opts(av, &ac, port->cmdline_options);
1273 :
1274 7256 : av[ac] = NULL;
1275 :
1276 : Assert(ac < maxac);
1277 :
1278 7256 : (void) process_postgres_switches(ac, av, gucctx, NULL);
1279 : }
1280 :
1281 : /*
1282 : * Process any additional GUC variable settings passed in startup packet.
1283 : * These are handled exactly like command-line variables.
1284 : */
1285 25478 : gucopts = list_head(port->guc_options);
1286 61276 : while (gucopts)
1287 : {
1288 : char *name;
1289 : char *value;
1290 :
1291 35798 : name = lfirst(gucopts);
1292 35798 : gucopts = lnext(port->guc_options, gucopts);
1293 :
1294 35798 : value = lfirst(gucopts);
1295 35798 : gucopts = lnext(port->guc_options, gucopts);
1296 :
1297 35798 : SetConfigOption(name, value, gucctx, PGC_S_CLIENT);
1298 : }
1299 25478 : }
1300 :
1301 : /*
1302 : * Load GUC settings from pg_db_role_setting.
1303 : *
1304 : * We try specific settings for the database/role combination, as well as
1305 : * general for this database and for this user.
1306 : */
1307 : static void
1308 31870 : process_settings(Oid databaseid, Oid roleid)
1309 : {
1310 : Relation relsetting;
1311 : Snapshot snapshot;
1312 :
1313 31870 : if (!IsUnderPostmaster)
1314 218 : return;
1315 :
1316 31652 : relsetting = table_open(DbRoleSettingRelationId, AccessShareLock);
1317 :
1318 : /* read all the settings under the same snapshot for efficiency */
1319 31652 : snapshot = RegisterSnapshot(GetCatalogSnapshot(DbRoleSettingRelationId));
1320 :
1321 : /* Later settings are ignored if set earlier. */
1322 31652 : ApplySetting(snapshot, databaseid, roleid, relsetting, PGC_S_DATABASE_USER);
1323 31652 : ApplySetting(snapshot, InvalidOid, roleid, relsetting, PGC_S_USER);
1324 31652 : ApplySetting(snapshot, databaseid, InvalidOid, relsetting, PGC_S_DATABASE);
1325 31652 : ApplySetting(snapshot, InvalidOid, InvalidOid, relsetting, PGC_S_GLOBAL);
1326 :
1327 31652 : UnregisterSnapshot(snapshot);
1328 31652 : table_close(relsetting, AccessShareLock);
1329 : }
1330 :
1331 : /*
1332 : * Backend-shutdown callback. Do cleanup that we want to be sure happens
1333 : * before all the supporting modules begin to nail their doors shut via
1334 : * their own callbacks.
1335 : *
1336 : * User-level cleanup, such as temp-relation removal and UNLISTEN, happens
1337 : * via separate callbacks that execute before this one. We don't combine the
1338 : * callbacks because we still want this one to happen if the user-level
1339 : * cleanup fails.
1340 : */
1341 : static void
1342 34552 : ShutdownPostgres(int code, Datum arg)
1343 : {
1344 : /* Make sure we've killed any active transaction */
1345 34552 : AbortOutOfAnyTransaction();
1346 :
1347 : /*
1348 : * User locks are not released by transaction end, so be sure to release
1349 : * them explicitly.
1350 : */
1351 34552 : LockReleaseAll(USER_LOCKMETHOD, true);
1352 34552 : }
1353 :
1354 :
1355 : /*
1356 : * STATEMENT_TIMEOUT handler: trigger a query-cancel interrupt.
1357 : */
1358 : static void
1359 12 : StatementTimeoutHandler(void)
1360 : {
1361 12 : int sig = SIGINT;
1362 :
1363 : /*
1364 : * During authentication the timeout is used to deal with
1365 : * authentication_timeout - we want to quit in response to such timeouts.
1366 : */
1367 12 : if (ClientAuthInProgress)
1368 0 : sig = SIGTERM;
1369 :
1370 : #ifdef HAVE_SETSID
1371 : /* try to signal whole process group */
1372 12 : kill(-MyProcPid, sig);
1373 : #endif
1374 12 : kill(MyProcPid, sig);
1375 12 : }
1376 :
1377 : /*
1378 : * LOCK_TIMEOUT handler: trigger a query-cancel interrupt.
1379 : */
1380 : static void
1381 8 : LockTimeoutHandler(void)
1382 : {
1383 : #ifdef HAVE_SETSID
1384 : /* try to signal whole process group */
1385 8 : kill(-MyProcPid, SIGINT);
1386 : #endif
1387 8 : kill(MyProcPid, SIGINT);
1388 8 : }
1389 :
1390 : static void
1391 2 : TransactionTimeoutHandler(void)
1392 : {
1393 2 : TransactionTimeoutPending = true;
1394 2 : InterruptPending = true;
1395 2 : SetLatch(MyLatch);
1396 2 : }
1397 :
1398 : static void
1399 2 : IdleInTransactionSessionTimeoutHandler(void)
1400 : {
1401 2 : IdleInTransactionSessionTimeoutPending = true;
1402 2 : InterruptPending = true;
1403 2 : SetLatch(MyLatch);
1404 2 : }
1405 :
1406 : static void
1407 2 : IdleSessionTimeoutHandler(void)
1408 : {
1409 2 : IdleSessionTimeoutPending = true;
1410 2 : InterruptPending = true;
1411 2 : SetLatch(MyLatch);
1412 2 : }
1413 :
1414 : static void
1415 42 : IdleStatsUpdateTimeoutHandler(void)
1416 : {
1417 42 : IdleStatsUpdateTimeoutPending = true;
1418 42 : InterruptPending = true;
1419 42 : SetLatch(MyLatch);
1420 42 : }
1421 :
1422 : static void
1423 0 : ClientCheckTimeoutHandler(void)
1424 : {
1425 0 : CheckClientConnectionPending = true;
1426 0 : InterruptPending = true;
1427 0 : SetLatch(MyLatch);
1428 0 : }
1429 :
1430 : /*
1431 : * Returns true if at least one role is defined in this database cluster.
1432 : */
1433 : static bool
1434 120 : ThereIsAtLeastOneRole(void)
1435 : {
1436 : Relation pg_authid_rel;
1437 : TableScanDesc scan;
1438 : bool result;
1439 :
1440 120 : pg_authid_rel = table_open(AuthIdRelationId, AccessShareLock);
1441 :
1442 120 : scan = table_beginscan_catalog(pg_authid_rel, 0, NULL);
1443 120 : result = (heap_getnext(scan, ForwardScanDirection) != NULL);
1444 :
1445 120 : table_endscan(scan);
1446 120 : table_close(pg_authid_rel, AccessShareLock);
1447 :
1448 120 : return result;
1449 : }
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