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 25596 : 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 25596 : 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 25596 : relation = table_open(DatabaseRelationId, AccessShareLock);
126 25596 : scan = systable_beginscan(relation, DatabaseNameIndexId,
127 : criticalSharedRelcachesBuilt,
128 : NULL,
129 : 1, key);
130 :
131 25596 : tuple = systable_getnext(scan);
132 :
133 : /* Must copy tuple before releasing buffer */
134 25596 : if (HeapTupleIsValid(tuple))
135 25578 : tuple = heap_copytuple(tuple);
136 :
137 : /* all done */
138 25596 : systable_endscan(scan);
139 25596 : table_close(relation, AccessShareLock);
140 :
141 25596 : return tuple;
142 : }
143 :
144 : /*
145 : * GetDatabaseTupleByOid -- as above, but search by database OID
146 : */
147 : static HeapTuple
148 34098 : 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 34098 : 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 34098 : relation = table_open(DatabaseRelationId, AccessShareLock);
169 34098 : scan = systable_beginscan(relation, DatabaseOidIndexId,
170 : criticalSharedRelcachesBuilt,
171 : NULL,
172 : 1, key);
173 :
174 34098 : tuple = systable_getnext(scan);
175 :
176 : /* Must copy tuple before releasing buffer */
177 34098 : if (HeapTupleIsValid(tuple))
178 34098 : tuple = heap_copytuple(tuple);
179 :
180 : /* all done */
181 34098 : systable_endscan(scan);
182 34098 : table_close(relation, AccessShareLock);
183 :
184 34098 : 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 26498 : PerformAuthentication(Port *port)
195 : {
196 : /* This should be set already, but let's make sure */
197 26498 : 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 26498 : 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 26498 : enable_timeout_after(STATEMENT_TIMEOUT, AuthenticationTimeout * 1000);
248 :
249 : /*
250 : * Now perform authentication exchange.
251 : */
252 26498 : set_ps_display("authentication");
253 26498 : ClientAuthentication(port); /* might not return, if failure */
254 :
255 : /*
256 : * Done with authentication. Disable the timeout, and log if needed.
257 : */
258 26364 : disable_timeout(STATEMENT_TIMEOUT, false);
259 :
260 : /* Capture authentication end time for logging */
261 26364 : conn_timing.auth_end = GetCurrentTimestamp();
262 :
263 26364 : if (log_connections & LOG_CONNECTION_AUTHORIZATION)
264 : {
265 : StringInfoData logmsg;
266 :
267 424 : initStringInfo(&logmsg);
268 424 : if (am_walsender)
269 0 : appendStringInfo(&logmsg, _("replication connection authorized: user=%s"),
270 : port->user_name);
271 : else
272 424 : appendStringInfo(&logmsg, _("connection authorized: user=%s"),
273 : port->user_name);
274 424 : if (!am_walsender)
275 424 : appendStringInfo(&logmsg, _(" database=%s"), port->database_name);
276 :
277 424 : if (port->application_name != NULL)
278 424 : appendStringInfo(&logmsg, _(" application_name=%s"),
279 : port->application_name);
280 :
281 : #ifdef USE_SSL
282 424 : if (port->ssl_in_use)
283 174 : 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 :
309 424 : ereport(LOG, errmsg_internal("%s", logmsg.data));
310 424 : pfree(logmsg.data);
311 : }
312 :
313 26364 : set_ps_display("startup");
314 :
315 26364 : ClientAuthInProgress = false; /* client_min_messages is active now */
316 26364 : }
317 :
318 :
319 : /*
320 : * CheckMyDatabase -- fetch information from the pg_database entry for our DB
321 : */
322 : static void
323 34084 : 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 34084 : tup = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(MyDatabaseId));
334 34084 : if (!HeapTupleIsValid(tup))
335 0 : elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
336 34084 : dbform = (Form_pg_database) GETSTRUCT(tup);
337 :
338 : /* This recheck is strictly paranoia */
339 34084 : 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 34084 : 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 33946 : 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 34528 : if (!am_superuser && !override_allow_connections &&
373 584 : 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 33944 : 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 34082 : SetDatabaseEncoding(dbform->encoding);
407 : /* Record it as a GUC internal option, too */
408 34082 : 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 34082 : SetConfigOption("client_encoding", GetDatabaseEncodingName(),
412 : PGC_BACKEND, PGC_S_DYNAMIC_DEFAULT);
413 :
414 : /* assign locale variables */
415 34082 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datcollate);
416 34082 : collate = TextDatumGetCString(datum);
417 34082 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datctype);
418 34082 : 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 34082 : 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 34082 : 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 34078 : datum = SysCacheGetAttr(DATABASEOID, tup, Anum_pg_database_datcollversion,
441 : &isnull);
442 34078 : if (!isnull)
443 : {
444 : char *actual_versionstr;
445 : char *collversionstr;
446 : char *locale;
447 :
448 32076 : collversionstr = TextDatumGetCString(datum);
449 :
450 32076 : if (dbform->datlocprovider == COLLPROVIDER_LIBC)
451 30332 : locale = collate;
452 : else
453 : {
454 1744 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datlocale);
455 1744 : locale = TextDatumGetCString(datum);
456 : }
457 :
458 32076 : actual_versionstr = get_collation_actual_version(dbform->datlocprovider, locale);
459 32076 : 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 32076 : 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 34078 : ReleaseSysCache(tup);
478 34078 : }
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 7480 : pg_split_opts(char **argv, int *argcp, const char *optstr)
493 : {
494 : StringInfoData s;
495 :
496 7480 : initStringInfo(&s);
497 :
498 27558 : while (*optstr)
499 : {
500 20078 : bool last_was_escape = false;
501 :
502 20078 : resetStringInfo(&s);
503 :
504 : /* skip over leading space */
505 37126 : while (isspace((unsigned char) *optstr))
506 17048 : optstr++;
507 :
508 20078 : 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 305344 : while (*optstr)
516 : {
517 297864 : if (isspace((unsigned char) *optstr) && !last_was_escape)
518 12598 : break;
519 :
520 285266 : if (!last_was_escape && *optstr == '\\')
521 32 : last_was_escape = true;
522 : else
523 : {
524 285234 : last_was_escape = false;
525 285234 : appendStringInfoChar(&s, *optstr);
526 : }
527 :
528 285266 : optstr++;
529 : }
530 :
531 : /* now store the option in the next argv[] position */
532 20078 : argv[(*argcp)++] = pstrdup(s.data);
533 : }
534 :
535 7480 : pfree(s.data);
536 7480 : }
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 2194 : InitializeMaxBackends(void)
551 : {
552 : Assert(MaxBackends == 0);
553 :
554 : /* Note that this does not include "auxiliary" processes */
555 2194 : MaxBackends = MaxConnections + autovacuum_worker_slots +
556 2194 : max_worker_processes + max_wal_senders + NUM_SPECIAL_WORKER_PROCS;
557 :
558 2194 : 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 2194 : }
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 2194 : 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 2194 : FastPathLockGroupsPerBackend =
590 2194 : 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 2194 : }
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 45616 : BaseInit(void)
608 : {
609 : Assert(MyProc != NULL);
610 :
611 : /*
612 : * Initialize our input/output/debugging file descriptors.
613 : */
614 45616 : DebugFileOpen();
615 :
616 : /*
617 : * Initialize file access. Done early so other subsystems can access
618 : * files.
619 : */
620 45616 : 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 45616 : pgstat_initialize();
629 :
630 : /*
631 : * Initialize AIO before infrastructure that might need to actually
632 : * execute AIO.
633 : */
634 45616 : pgaio_init_backend();
635 :
636 : /* Do local initialization of storage and buffer managers */
637 45616 : InitSync();
638 45616 : smgrinit();
639 45616 : 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 45616 : InitTemporaryFileAccess();
646 :
647 : /*
648 : * Initialize local buffers for WAL record construction, in case we ever
649 : * try to insert XLOG.
650 : */
651 45616 : InitXLogInsert();
652 :
653 : /* Initialize lock manager's local structs */
654 45616 : InitLockManagerAccess();
655 :
656 : /*
657 : * Initialize replication slots after pgstat. The exit hook might need to
658 : * drop ephemeral slots, which in turn triggers stats reporting.
659 : */
660 45616 : ReplicationSlotInitialize();
661 45616 : }
662 :
663 :
664 : /* --------------------------------
665 : * InitPostgres
666 : * Initialize POSTGRES.
667 : *
668 : * Parameters:
669 : * in_dbname, dboid: specify database to connect to, as described below
670 : * username, useroid: specify role to connect as, as described below
671 : * flags:
672 : * - INIT_PG_LOAD_SESSION_LIBS to honor [session|local]_preload_libraries.
673 : * - INIT_PG_OVERRIDE_ALLOW_CONNS to connect despite !datallowconn.
674 : * - INIT_PG_OVERRIDE_ROLE_LOGIN to connect despite !rolcanlogin.
675 : * out_dbname: optional output parameter, see below; pass NULL if not used
676 : *
677 : * The database can be specified by name, using the in_dbname parameter, or by
678 : * OID, using the dboid parameter. Specify NULL or InvalidOid respectively
679 : * for the unused parameter. If dboid is provided, the actual database
680 : * name can be returned to the caller in out_dbname. If out_dbname isn't
681 : * NULL, it must point to a buffer of size NAMEDATALEN.
682 : *
683 : * Similarly, the role can be passed by name, using the username parameter,
684 : * or by OID using the useroid parameter.
685 : *
686 : * In bootstrap mode the database and username parameters are NULL/InvalidOid.
687 : * The autovacuum launcher process doesn't specify these parameters either,
688 : * because it only goes far enough to be able to read pg_database; it doesn't
689 : * connect to any particular database. An autovacuum worker specifies a
690 : * database but not a username; conversely, a physical walsender specifies
691 : * username but not database.
692 : *
693 : * By convention, INIT_PG_LOAD_SESSION_LIBS should be passed in "flags" in
694 : * "interactive" sessions (including standalone backends), but not in
695 : * background processes such as autovacuum. Note in particular that it
696 : * shouldn't be true in parallel worker processes; those have another
697 : * mechanism for replicating their leader's set of loaded libraries.
698 : *
699 : * We expect that InitProcess() was already called, so we already have a
700 : * PGPROC struct ... but it's not completely filled in yet.
701 : *
702 : * Note:
703 : * Be very careful with the order of calls in the InitPostgres function.
704 : * --------------------------------
705 : */
706 : void
707 36926 : InitPostgres(const char *in_dbname, Oid dboid,
708 : const char *username, Oid useroid,
709 : bits32 flags,
710 : char *out_dbname)
711 : {
712 36926 : bool bootstrap = IsBootstrapProcessingMode();
713 : bool am_superuser;
714 : char *fullpath;
715 : char dbname[NAMEDATALEN];
716 36926 : int nfree = 0;
717 :
718 36926 : elog(DEBUG3, "InitPostgres");
719 :
720 : /*
721 : * Add my PGPROC struct to the ProcArray.
722 : *
723 : * Once I have done this, I am visible to other backends!
724 : */
725 36926 : InitProcessPhase2();
726 :
727 : /* Initialize status reporting */
728 36926 : pgstat_beinit();
729 :
730 : /*
731 : * And initialize an entry in the PgBackendStatus array. That way, if
732 : * LWLocks or third-party authentication should happen to hang, it is
733 : * possible to retrieve some information about what is going on.
734 : */
735 36926 : if (!bootstrap)
736 : {
737 36826 : pgstat_bestart_initial();
738 36826 : INJECTION_POINT("init-pre-auth", NULL);
739 : }
740 :
741 : /*
742 : * Initialize my entry in the shared-invalidation manager's array of
743 : * per-backend data.
744 : */
745 36926 : SharedInvalBackendInit(false);
746 :
747 36926 : ProcSignalInit(MyCancelKey, MyCancelKeyLength);
748 :
749 : /*
750 : * Also set up timeout handlers needed for backend operation. We need
751 : * these in every case except bootstrap.
752 : */
753 36926 : if (!bootstrap)
754 : {
755 36826 : RegisterTimeout(DEADLOCK_TIMEOUT, CheckDeadLockAlert);
756 36826 : RegisterTimeout(STATEMENT_TIMEOUT, StatementTimeoutHandler);
757 36826 : RegisterTimeout(LOCK_TIMEOUT, LockTimeoutHandler);
758 36826 : RegisterTimeout(IDLE_IN_TRANSACTION_SESSION_TIMEOUT,
759 : IdleInTransactionSessionTimeoutHandler);
760 36826 : RegisterTimeout(TRANSACTION_TIMEOUT, TransactionTimeoutHandler);
761 36826 : RegisterTimeout(IDLE_SESSION_TIMEOUT, IdleSessionTimeoutHandler);
762 36826 : RegisterTimeout(CLIENT_CONNECTION_CHECK_TIMEOUT, ClientCheckTimeoutHandler);
763 36826 : RegisterTimeout(IDLE_STATS_UPDATE_TIMEOUT,
764 : IdleStatsUpdateTimeoutHandler);
765 : }
766 :
767 : /*
768 : * If this is either a bootstrap process or a standalone backend, start up
769 : * the XLOG machinery, and register to have it closed down at exit. In
770 : * other cases, the startup process is responsible for starting up the
771 : * XLOG machinery, and the checkpointer for closing it down.
772 : */
773 36926 : if (!IsUnderPostmaster)
774 : {
775 : /*
776 : * We don't yet have an aux-process resource owner, but StartupXLOG
777 : * and ShutdownXLOG will need one. Hence, create said resource owner
778 : * (and register a callback to clean it up after ShutdownXLOG runs).
779 : */
780 238 : CreateAuxProcessResourceOwner();
781 :
782 238 : StartupXLOG();
783 : /* Release (and warn about) any buffer pins leaked in StartupXLOG */
784 238 : ReleaseAuxProcessResources(true);
785 : /* Reset CurrentResourceOwner to nothing for the moment */
786 238 : CurrentResourceOwner = NULL;
787 :
788 : /*
789 : * Use before_shmem_exit() so that ShutdownXLOG() can rely on DSM
790 : * segments etc to work (which in turn is required for pgstats).
791 : */
792 238 : before_shmem_exit(pgstat_before_server_shutdown, 0);
793 238 : before_shmem_exit(ShutdownXLOG, 0);
794 : }
795 :
796 : /*
797 : * Initialize the relation cache and the system catalog caches. Note that
798 : * no catalog access happens here; we only set up the hashtable structure.
799 : * We must do this before starting a transaction because transaction abort
800 : * would try to touch these hashtables.
801 : */
802 36926 : RelationCacheInitialize();
803 36926 : InitCatalogCache();
804 36926 : InitPlanCache();
805 :
806 : /* Initialize portal manager */
807 36926 : EnablePortalManager();
808 :
809 : /*
810 : * Load relcache entries for the shared system catalogs. This must create
811 : * at least entries for pg_database and catalogs used for authentication.
812 : */
813 36926 : RelationCacheInitializePhase2();
814 :
815 : /*
816 : * Set up process-exit callback to do pre-shutdown cleanup. This is the
817 : * one of the first before_shmem_exit callbacks we register; thus, this
818 : * will be one the last things we do before low-level modules like the
819 : * buffer manager begin to close down. We need to have this in place
820 : * before we begin our first transaction --- if we fail during the
821 : * initialization transaction, as is entirely possible, we need the
822 : * AbortTransaction call to clean up.
823 : */
824 36926 : before_shmem_exit(ShutdownPostgres, 0);
825 :
826 : /* The autovacuum launcher is done here */
827 36926 : if (AmAutoVacuumLauncherProcess())
828 : {
829 : /* fill in the remainder of this entry in the PgBackendStatus array */
830 798 : pgstat_bestart_final();
831 :
832 2562 : return;
833 : }
834 :
835 : /*
836 : * Start a new transaction here before first access to db.
837 : */
838 36128 : if (!bootstrap)
839 : {
840 : /* statement_timestamp must be set for timeouts to work correctly */
841 36028 : SetCurrentStatementStartTimestamp();
842 36028 : StartTransactionCommand();
843 :
844 : /*
845 : * transaction_isolation will have been set to the default by the
846 : * above. If the default is "serializable", and we are in hot
847 : * standby, we will fail if we don't change it to something lower.
848 : * Fortunately, "read committed" is plenty good enough.
849 : */
850 36028 : XactIsoLevel = XACT_READ_COMMITTED;
851 : }
852 :
853 : /*
854 : * Perform client authentication if necessary, then figure out our
855 : * postgres user ID, and see if we are a superuser.
856 : *
857 : * In standalone mode, autovacuum worker processes and slot sync worker
858 : * process, we use a fixed ID, otherwise we figure it out from the
859 : * authenticated user name.
860 : */
861 36128 : if (bootstrap || AmAutoVacuumWorkerProcess() || AmLogicalSlotSyncWorkerProcess())
862 : {
863 4748 : InitializeSessionUserIdStandalone();
864 4748 : am_superuser = true;
865 : }
866 31380 : else if (!IsUnderPostmaster)
867 : {
868 138 : InitializeSessionUserIdStandalone();
869 138 : am_superuser = true;
870 138 : if (!ThereIsAtLeastOneRole())
871 0 : ereport(WARNING,
872 : (errcode(ERRCODE_UNDEFINED_OBJECT),
873 : errmsg("no roles are defined in this database system"),
874 : errhint("You should immediately run CREATE USER \"%s\" SUPERUSER;.",
875 : username != NULL ? username : "postgres")));
876 : }
877 31242 : else if (AmBackgroundWorkerProcess())
878 : {
879 4744 : if (username == NULL && !OidIsValid(useroid))
880 : {
881 866 : InitializeSessionUserIdStandalone();
882 866 : am_superuser = true;
883 : }
884 : else
885 : {
886 3878 : InitializeSessionUserId(username, useroid,
887 3878 : (flags & INIT_PG_OVERRIDE_ROLE_LOGIN) != 0);
888 3876 : am_superuser = superuser();
889 : }
890 : }
891 : else
892 : {
893 : /* normal multiuser case */
894 : Assert(MyProcPort != NULL);
895 26498 : PerformAuthentication(MyProcPort);
896 26364 : InitializeSessionUserId(username, useroid, false);
897 : /* ensure that auth_method is actually valid, aka authn_id is not NULL */
898 26356 : if (MyClientConnectionInfo.authn_id)
899 248 : InitializeSystemUser(MyClientConnectionInfo.authn_id,
900 : hba_authname(MyClientConnectionInfo.auth_method));
901 26356 : am_superuser = superuser();
902 : }
903 :
904 : /* Report any SSL/GSS details for the session. */
905 35984 : if (MyProcPort != NULL)
906 : {
907 : Assert(!bootstrap);
908 :
909 26356 : pgstat_bestart_security();
910 : }
911 :
912 : /*
913 : * Binary upgrades only allowed super-user connections
914 : */
915 35984 : if (IsBinaryUpgrade && !am_superuser)
916 : {
917 0 : ereport(FATAL,
918 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
919 : errmsg("must be superuser to connect in binary upgrade mode")));
920 : }
921 :
922 : /*
923 : * The last few regular connection slots are reserved for superusers and
924 : * roles with privileges of pg_use_reserved_connections. We do not apply
925 : * these limits to background processes, since they all have their own
926 : * pools of PGPROC slots.
927 : *
928 : * Note: At this point, the new backend has already claimed a proc struct,
929 : * so we must check whether the number of free slots is strictly less than
930 : * the reserved connection limits.
931 : */
932 35984 : if (AmRegularBackendProcess() && !am_superuser &&
933 494 : (SuperuserReservedConnections + ReservedConnections) > 0 &&
934 494 : !HaveNFreeProcs(SuperuserReservedConnections + ReservedConnections, &nfree))
935 : {
936 8 : if (nfree < SuperuserReservedConnections)
937 2 : ereport(FATAL,
938 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
939 : errmsg("remaining connection slots are reserved for roles with the %s attribute",
940 : "SUPERUSER")));
941 :
942 6 : if (!has_privs_of_role(GetUserId(), ROLE_PG_USE_RESERVED_CONNECTIONS))
943 2 : ereport(FATAL,
944 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
945 : errmsg("remaining connection slots are reserved for roles with privileges of the \"%s\" role",
946 : "pg_use_reserved_connections")));
947 : }
948 :
949 : /* Check replication permissions needed for walsender processes. */
950 35980 : if (am_walsender)
951 : {
952 : Assert(!bootstrap);
953 :
954 2332 : if (!has_rolreplication(GetUserId()))
955 0 : ereport(FATAL,
956 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
957 : errmsg("permission denied to start WAL sender"),
958 : errdetail("Only roles with the %s attribute may start a WAL sender process.",
959 : "REPLICATION")));
960 : }
961 :
962 : /*
963 : * If this is a plain walsender only supporting physical replication, we
964 : * don't want to connect to any particular database. Just finish the
965 : * backend startup by processing any options from the startup packet, and
966 : * we're done.
967 : */
968 35980 : if (am_walsender && !am_db_walsender)
969 : {
970 : /* process any options passed in the startup packet */
971 902 : if (MyProcPort != NULL)
972 902 : process_startup_options(MyProcPort, am_superuser);
973 :
974 : /* Apply PostAuthDelay as soon as we've read all options */
975 902 : if (PostAuthDelay > 0)
976 0 : pg_usleep(PostAuthDelay * 1000000L);
977 :
978 : /* initialize client encoding */
979 902 : InitializeClientEncoding();
980 :
981 : /* fill in the remainder of this entry in the PgBackendStatus array */
982 902 : pgstat_bestart_final();
983 :
984 : /* close the transaction we started above */
985 902 : CommitTransactionCommand();
986 :
987 902 : return;
988 : }
989 :
990 : /*
991 : * Set up the global variables holding database id and default tablespace.
992 : * But note we won't actually try to touch the database just yet.
993 : *
994 : * We take a shortcut in the bootstrap case, otherwise we have to look up
995 : * the db's entry in pg_database.
996 : */
997 35078 : if (bootstrap)
998 : {
999 100 : dboid = Template1DbOid;
1000 100 : MyDatabaseTableSpace = DEFAULTTABLESPACE_OID;
1001 : }
1002 34978 : else if (in_dbname != NULL)
1003 : {
1004 : HeapTuple tuple;
1005 : Form_pg_database dbform;
1006 :
1007 25596 : tuple = GetDatabaseTuple(in_dbname);
1008 25596 : if (!HeapTupleIsValid(tuple))
1009 18 : ereport(FATAL,
1010 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1011 : errmsg("database \"%s\" does not exist", in_dbname)));
1012 25578 : dbform = (Form_pg_database) GETSTRUCT(tuple);
1013 25578 : dboid = dbform->oid;
1014 : }
1015 9382 : else if (!OidIsValid(dboid))
1016 : {
1017 : /*
1018 : * If this is a background worker not bound to any particular
1019 : * database, we're done now. Everything that follows only makes sense
1020 : * if we are bound to a specific database. We do need to close the
1021 : * transaction we started before returning.
1022 : */
1023 862 : if (!bootstrap)
1024 : {
1025 862 : pgstat_bestart_final();
1026 862 : CommitTransactionCommand();
1027 : }
1028 862 : return;
1029 : }
1030 :
1031 : /*
1032 : * Now, take a writer's lock on the database we are trying to connect to.
1033 : * If there is a concurrently running DROP DATABASE on that database, this
1034 : * will block us until it finishes (and has committed its update of
1035 : * pg_database).
1036 : *
1037 : * Note that the lock is not held long, only until the end of this startup
1038 : * transaction. This is OK since we will advertise our use of the
1039 : * database in the ProcArray before dropping the lock (in fact, that's the
1040 : * next thing to do). Anyone trying a DROP DATABASE after this point will
1041 : * see us in the array once they have the lock. Ordering is important for
1042 : * this because we don't want to advertise ourselves as being in this
1043 : * database until we have the lock; otherwise we create what amounts to a
1044 : * deadlock with CountOtherDBBackends().
1045 : *
1046 : * Note: use of RowExclusiveLock here is reasonable because we envision
1047 : * our session as being a concurrent writer of the database. If we had a
1048 : * way of declaring a session as being guaranteed-read-only, we could use
1049 : * AccessShareLock for such sessions and thereby not conflict against
1050 : * CREATE DATABASE.
1051 : */
1052 34198 : if (!bootstrap)
1053 34098 : LockSharedObject(DatabaseRelationId, dboid, 0, RowExclusiveLock);
1054 :
1055 : /*
1056 : * Recheck pg_database to make sure the target database hasn't gone away.
1057 : * If there was a concurrent DROP DATABASE, this ensures we will die
1058 : * cleanly without creating a mess.
1059 : */
1060 34198 : if (!bootstrap)
1061 : {
1062 : HeapTuple tuple;
1063 : Form_pg_database datform;
1064 :
1065 34098 : tuple = GetDatabaseTupleByOid(dboid);
1066 34098 : if (HeapTupleIsValid(tuple))
1067 34098 : datform = (Form_pg_database) GETSTRUCT(tuple);
1068 :
1069 34098 : if (!HeapTupleIsValid(tuple) ||
1070 25578 : (in_dbname && namestrcmp(&datform->datname, in_dbname)))
1071 : {
1072 0 : if (in_dbname)
1073 0 : ereport(FATAL,
1074 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1075 : errmsg("database \"%s\" does not exist", in_dbname),
1076 : errdetail("It seems to have just been dropped or renamed.")));
1077 : else
1078 0 : ereport(FATAL,
1079 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1080 : errmsg("database %u does not exist", dboid)));
1081 : }
1082 :
1083 34098 : strlcpy(dbname, NameStr(datform->datname), sizeof(dbname));
1084 :
1085 34098 : if (database_is_invalid_form(datform))
1086 : {
1087 8 : ereport(FATAL,
1088 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1089 : errmsg("cannot connect to invalid database \"%s\"", dbname),
1090 : errhint("Use DROP DATABASE to drop invalid databases."));
1091 : }
1092 :
1093 34090 : MyDatabaseTableSpace = datform->dattablespace;
1094 34090 : MyDatabaseHasLoginEventTriggers = datform->dathasloginevt;
1095 : /* pass the database name back to the caller */
1096 34090 : if (out_dbname)
1097 4640 : strcpy(out_dbname, dbname);
1098 : }
1099 :
1100 : /*
1101 : * Now that we rechecked, we are certain to be connected to a database and
1102 : * thus can set MyDatabaseId.
1103 : *
1104 : * It is important that MyDatabaseId only be set once we are sure that the
1105 : * target database can no longer be concurrently dropped or renamed. For
1106 : * example, without this guarantee, pgstat_update_dbstats() could create
1107 : * entries for databases that were just dropped in the pgstat shutdown
1108 : * callback, which could confuse other code paths like the autovacuum
1109 : * scheduler.
1110 : */
1111 34190 : MyDatabaseId = dboid;
1112 :
1113 : /*
1114 : * Now we can mark our PGPROC entry with the database ID.
1115 : *
1116 : * We assume this is an atomic store so no lock is needed; though actually
1117 : * things would work fine even if it weren't atomic. Anyone searching the
1118 : * ProcArray for this database's ID should hold the database lock, so they
1119 : * would not be executing concurrently with this store. A process looking
1120 : * for another database's ID could in theory see a chance match if it read
1121 : * a partially-updated databaseId value; but as long as all such searches
1122 : * wait and retry, as in CountOtherDBBackends(), they will certainly see
1123 : * the correct value on their next try.
1124 : */
1125 34190 : MyProc->databaseId = MyDatabaseId;
1126 :
1127 : /*
1128 : * We established a catalog snapshot while reading pg_authid and/or
1129 : * pg_database; but until we have set up MyDatabaseId, we won't react to
1130 : * incoming sinval messages for unshared catalogs, so we won't realize it
1131 : * if the snapshot has been invalidated. Assume it's no good anymore.
1132 : */
1133 34190 : InvalidateCatalogSnapshot();
1134 :
1135 : /*
1136 : * Now we should be able to access the database directory safely. Verify
1137 : * it's there and looks reasonable.
1138 : */
1139 34190 : fullpath = GetDatabasePath(MyDatabaseId, MyDatabaseTableSpace);
1140 :
1141 34190 : if (!bootstrap)
1142 : {
1143 34090 : if (access(fullpath, F_OK) == -1)
1144 : {
1145 0 : if (errno == ENOENT)
1146 0 : ereport(FATAL,
1147 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1148 : errmsg("database \"%s\" does not exist",
1149 : dbname),
1150 : errdetail("The database subdirectory \"%s\" is missing.",
1151 : fullpath)));
1152 : else
1153 0 : ereport(FATAL,
1154 : (errcode_for_file_access(),
1155 : errmsg("could not access directory \"%s\": %m",
1156 : fullpath)));
1157 : }
1158 :
1159 34090 : ValidatePgVersion(fullpath);
1160 : }
1161 :
1162 34190 : SetDatabasePath(fullpath);
1163 34190 : pfree(fullpath);
1164 :
1165 : /*
1166 : * It's now possible to do real access to the system catalogs.
1167 : *
1168 : * Load relcache entries for the system catalogs. This must create at
1169 : * least the minimum set of "nailed-in" cache entries.
1170 : */
1171 34190 : RelationCacheInitializePhase3();
1172 :
1173 : /* set up ACL framework (so CheckMyDatabase can check permissions) */
1174 34184 : initialize_acl();
1175 :
1176 : /*
1177 : * Re-read the pg_database row for our database, check permissions and set
1178 : * up database-specific GUC settings. We can't do this until all the
1179 : * database-access infrastructure is up. (Also, it wants to know if the
1180 : * user is a superuser, so the above stuff has to happen first.)
1181 : */
1182 34184 : if (!bootstrap)
1183 34084 : CheckMyDatabase(dbname, am_superuser,
1184 34084 : (flags & INIT_PG_OVERRIDE_ALLOW_CONNS) != 0);
1185 :
1186 : /*
1187 : * Now process any command-line switches and any additional GUC variable
1188 : * settings passed in the startup packet. We couldn't do this before
1189 : * because we didn't know if client is a superuser.
1190 : */
1191 34178 : if (MyProcPort != NULL)
1192 25424 : process_startup_options(MyProcPort, am_superuser);
1193 :
1194 : /* Process pg_db_role_setting options */
1195 34178 : process_settings(MyDatabaseId, GetSessionUserId());
1196 :
1197 : /* Apply PostAuthDelay as soon as we've read all options */
1198 34174 : if (PostAuthDelay > 0)
1199 0 : pg_usleep(PostAuthDelay * 1000000L);
1200 :
1201 : /*
1202 : * Initialize various default states that can't be set up until we've
1203 : * selected the active user and gotten the right GUC settings.
1204 : */
1205 :
1206 : /* set default namespace search path */
1207 34174 : InitializeSearchPath();
1208 :
1209 : /* initialize client encoding */
1210 34174 : InitializeClientEncoding();
1211 :
1212 : /* Initialize this backend's session state. */
1213 34174 : InitializeSession();
1214 :
1215 : /*
1216 : * If this is an interactive session, load any libraries that should be
1217 : * preloaded at backend start. Since those are determined by GUCs, this
1218 : * can't happen until GUC settings are complete, but we want it to happen
1219 : * during the initial transaction in case anything that requires database
1220 : * access needs to be done.
1221 : */
1222 34174 : if ((flags & INIT_PG_LOAD_SESSION_LIBS) != 0)
1223 24128 : process_session_preload_libraries();
1224 :
1225 : /* fill in the remainder of this entry in the PgBackendStatus array */
1226 34174 : if (!bootstrap)
1227 34074 : pgstat_bestart_final();
1228 :
1229 : /* close the transaction we started above */
1230 34174 : if (!bootstrap)
1231 34074 : CommitTransactionCommand();
1232 : }
1233 :
1234 : /*
1235 : * Process any command-line switches and any additional GUC variable
1236 : * settings passed in the startup packet.
1237 : */
1238 : static void
1239 26326 : process_startup_options(Port *port, bool am_superuser)
1240 : {
1241 : GucContext gucctx;
1242 : ListCell *gucopts;
1243 :
1244 26326 : gucctx = am_superuser ? PGC_SU_BACKEND : PGC_BACKEND;
1245 :
1246 : /*
1247 : * First process any command-line switches that were included in the
1248 : * startup packet, if we are in a regular backend.
1249 : */
1250 26326 : if (port->cmdline_options != NULL)
1251 : {
1252 : /*
1253 : * The maximum possible number of commandline arguments that could
1254 : * come from port->cmdline_options is (strlen + 1) / 2; see
1255 : * pg_split_opts().
1256 : */
1257 : char **av;
1258 : int maxac;
1259 : int ac;
1260 :
1261 7480 : maxac = 2 + (strlen(port->cmdline_options) + 1) / 2;
1262 :
1263 7480 : av = (char **) palloc(maxac * sizeof(char *));
1264 7480 : ac = 0;
1265 :
1266 7480 : av[ac++] = "postgres";
1267 :
1268 7480 : pg_split_opts(av, &ac, port->cmdline_options);
1269 :
1270 7480 : av[ac] = NULL;
1271 :
1272 : Assert(ac < maxac);
1273 :
1274 7480 : (void) process_postgres_switches(ac, av, gucctx, NULL);
1275 : }
1276 :
1277 : /*
1278 : * Process any additional GUC variable settings passed in startup packet.
1279 : * These are handled exactly like command-line variables.
1280 : */
1281 26326 : gucopts = list_head(port->guc_options);
1282 63202 : while (gucopts)
1283 : {
1284 : char *name;
1285 : char *value;
1286 :
1287 36876 : name = lfirst(gucopts);
1288 36876 : gucopts = lnext(port->guc_options, gucopts);
1289 :
1290 36876 : value = lfirst(gucopts);
1291 36876 : gucopts = lnext(port->guc_options, gucopts);
1292 :
1293 36876 : SetConfigOption(name, value, gucctx, PGC_S_CLIENT);
1294 : }
1295 26326 : }
1296 :
1297 : /*
1298 : * Load GUC settings from pg_db_role_setting.
1299 : *
1300 : * We try specific settings for the database/role combination, as well as
1301 : * general for this database and for this user.
1302 : */
1303 : static void
1304 34178 : process_settings(Oid databaseid, Oid roleid)
1305 : {
1306 : Relation relsetting;
1307 : Snapshot snapshot;
1308 :
1309 34178 : if (!IsUnderPostmaster)
1310 234 : return;
1311 :
1312 33944 : relsetting = table_open(DbRoleSettingRelationId, AccessShareLock);
1313 :
1314 : /* read all the settings under the same snapshot for efficiency */
1315 33944 : snapshot = RegisterSnapshot(GetCatalogSnapshot(DbRoleSettingRelationId));
1316 :
1317 : /* Later settings are ignored if set earlier. */
1318 33944 : ApplySetting(snapshot, databaseid, roleid, relsetting, PGC_S_DATABASE_USER);
1319 33940 : ApplySetting(snapshot, InvalidOid, roleid, relsetting, PGC_S_USER);
1320 33940 : ApplySetting(snapshot, databaseid, InvalidOid, relsetting, PGC_S_DATABASE);
1321 33940 : ApplySetting(snapshot, InvalidOid, InvalidOid, relsetting, PGC_S_GLOBAL);
1322 :
1323 33940 : UnregisterSnapshot(snapshot);
1324 33940 : table_close(relsetting, AccessShareLock);
1325 : }
1326 :
1327 : /*
1328 : * Backend-shutdown callback. Do cleanup that we want to be sure happens
1329 : * before all the supporting modules begin to nail their doors shut via
1330 : * their own callbacks.
1331 : *
1332 : * User-level cleanup, such as temp-relation removal and UNLISTEN, happens
1333 : * via separate callbacks that execute before this one. We don't combine the
1334 : * callbacks because we still want this one to happen if the user-level
1335 : * cleanup fails.
1336 : */
1337 : static void
1338 36926 : ShutdownPostgres(int code, Datum arg)
1339 : {
1340 : /* Make sure we've killed any active transaction */
1341 36926 : AbortOutOfAnyTransaction();
1342 :
1343 : /*
1344 : * User locks are not released by transaction end, so be sure to release
1345 : * them explicitly.
1346 : */
1347 36926 : LockReleaseAll(USER_LOCKMETHOD, true);
1348 36926 : }
1349 :
1350 :
1351 : /*
1352 : * STATEMENT_TIMEOUT handler: trigger a query-cancel interrupt.
1353 : */
1354 : static void
1355 12 : StatementTimeoutHandler(void)
1356 : {
1357 12 : int sig = SIGINT;
1358 :
1359 : /*
1360 : * During authentication the timeout is used to deal with
1361 : * authentication_timeout - we want to quit in response to such timeouts.
1362 : */
1363 12 : if (ClientAuthInProgress)
1364 0 : sig = SIGTERM;
1365 :
1366 : #ifdef HAVE_SETSID
1367 : /* try to signal whole process group */
1368 12 : kill(-MyProcPid, sig);
1369 : #endif
1370 12 : kill(MyProcPid, sig);
1371 12 : }
1372 :
1373 : /*
1374 : * LOCK_TIMEOUT handler: trigger a query-cancel interrupt.
1375 : */
1376 : static void
1377 8 : LockTimeoutHandler(void)
1378 : {
1379 : #ifdef HAVE_SETSID
1380 : /* try to signal whole process group */
1381 8 : kill(-MyProcPid, SIGINT);
1382 : #endif
1383 8 : kill(MyProcPid, SIGINT);
1384 8 : }
1385 :
1386 : static void
1387 2 : TransactionTimeoutHandler(void)
1388 : {
1389 2 : TransactionTimeoutPending = true;
1390 2 : InterruptPending = true;
1391 2 : SetLatch(MyLatch);
1392 2 : }
1393 :
1394 : static void
1395 2 : IdleInTransactionSessionTimeoutHandler(void)
1396 : {
1397 2 : IdleInTransactionSessionTimeoutPending = true;
1398 2 : InterruptPending = true;
1399 2 : SetLatch(MyLatch);
1400 2 : }
1401 :
1402 : static void
1403 2 : IdleSessionTimeoutHandler(void)
1404 : {
1405 2 : IdleSessionTimeoutPending = true;
1406 2 : InterruptPending = true;
1407 2 : SetLatch(MyLatch);
1408 2 : }
1409 :
1410 : static void
1411 38 : IdleStatsUpdateTimeoutHandler(void)
1412 : {
1413 38 : IdleStatsUpdateTimeoutPending = true;
1414 38 : InterruptPending = true;
1415 38 : SetLatch(MyLatch);
1416 38 : }
1417 :
1418 : static void
1419 0 : ClientCheckTimeoutHandler(void)
1420 : {
1421 0 : CheckClientConnectionPending = true;
1422 0 : InterruptPending = true;
1423 0 : SetLatch(MyLatch);
1424 0 : }
1425 :
1426 : /*
1427 : * Returns true if at least one role is defined in this database cluster.
1428 : */
1429 : static bool
1430 138 : ThereIsAtLeastOneRole(void)
1431 : {
1432 : Relation pg_authid_rel;
1433 : TableScanDesc scan;
1434 : bool result;
1435 :
1436 138 : pg_authid_rel = table_open(AuthIdRelationId, AccessShareLock);
1437 :
1438 138 : scan = table_beginscan_catalog(pg_authid_rel, 0, NULL);
1439 138 : result = (heap_getnext(scan, ForwardScanDirection) != NULL);
1440 :
1441 138 : table_endscan(scan);
1442 138 : table_close(pg_authid_rel, AccessShareLock);
1443 :
1444 138 : return result;
1445 : }
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