Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * postinit.c
4 : * postgres initialization utilities
5 : *
6 : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
7 : * Portions Copyright (c) 1994, Regents of the University of California
8 : *
9 : *
10 : * IDENTIFICATION
11 : * src/backend/utils/init/postinit.c
12 : *
13 : *
14 : *-------------------------------------------------------------------------
15 : */
16 : #include "postgres.h"
17 :
18 : #include <ctype.h>
19 : #include <fcntl.h>
20 : #include <unistd.h>
21 :
22 : #include "access/genam.h"
23 : #include "access/heapam.h"
24 : #include "access/htup_details.h"
25 : #include "access/session.h"
26 : #include "access/tableam.h"
27 : #include "access/xact.h"
28 : #include "access/xlog.h"
29 : #include "access/xloginsert.h"
30 : #include "catalog/namespace.h"
31 : #include "catalog/pg_authid.h"
32 : #include "catalog/pg_collation.h"
33 : #include "catalog/pg_database.h"
34 : #include "catalog/pg_db_role_setting.h"
35 : #include "catalog/pg_tablespace.h"
36 : #include "libpq/auth.h"
37 : #include "libpq/libpq-be.h"
38 : #include "mb/pg_wchar.h"
39 : #include "miscadmin.h"
40 : #include "pgstat.h"
41 : #include "port/pg_bitutils.h"
42 : #include "postmaster/autovacuum.h"
43 : #include "postmaster/postmaster.h"
44 : #include "replication/slot.h"
45 : #include "replication/slotsync.h"
46 : #include "replication/walsender.h"
47 : #include "storage/aio_subsys.h"
48 : #include "storage/bufmgr.h"
49 : #include "storage/fd.h"
50 : #include "storage/ipc.h"
51 : #include "storage/lmgr.h"
52 : #include "storage/proc.h"
53 : #include "storage/procarray.h"
54 : #include "storage/procnumber.h"
55 : #include "storage/procsignal.h"
56 : #include "storage/sinvaladt.h"
57 : #include "storage/smgr.h"
58 : #include "storage/sync.h"
59 : #include "tcop/backend_startup.h"
60 : #include "tcop/tcopprot.h"
61 : #include "utils/acl.h"
62 : #include "utils/builtins.h"
63 : #include "utils/fmgroids.h"
64 : #include "utils/guc_hooks.h"
65 : #include "utils/injection_point.h"
66 : #include "utils/memutils.h"
67 : #include "utils/pg_locale.h"
68 : #include "utils/portal.h"
69 : #include "utils/ps_status.h"
70 : #include "utils/snapmgr.h"
71 : #include "utils/syscache.h"
72 : #include "utils/timeout.h"
73 :
74 : /* has this backend called EmitConnectionWarnings()? */
75 : static bool ConnectionWarningsEmitted;
76 :
77 : /* content of warnings to send via EmitConnectionWarnings() */
78 : static List *ConnectionWarningMessages;
79 : static List *ConnectionWarningDetails;
80 :
81 : static HeapTuple GetDatabaseTuple(const char *dbname);
82 : static HeapTuple GetDatabaseTupleByOid(Oid dboid);
83 : static void PerformAuthentication(Port *port);
84 : static void CheckMyDatabase(const char *name, bool am_superuser, bool override_allow_connections);
85 : static void ShutdownPostgres(int code, Datum arg);
86 : static void StatementTimeoutHandler(void);
87 : static void LockTimeoutHandler(void);
88 : static void IdleInTransactionSessionTimeoutHandler(void);
89 : static void TransactionTimeoutHandler(void);
90 : static void IdleSessionTimeoutHandler(void);
91 : static void IdleStatsUpdateTimeoutHandler(void);
92 : static void ClientCheckTimeoutHandler(void);
93 : static bool ThereIsAtLeastOneRole(void);
94 : static void process_startup_options(Port *port, bool am_superuser);
95 : static void process_settings(Oid databaseid, Oid roleid);
96 : static void EmitConnectionWarnings(void);
97 :
98 :
99 : /*** InitPostgres support ***/
100 :
101 :
102 : /*
103 : * GetDatabaseTuple -- fetch the pg_database row for a database
104 : *
105 : * This is used during backend startup when we don't yet have any access to
106 : * system catalogs in general. In the worst case, we can seqscan pg_database
107 : * using nothing but the hard-wired descriptor that relcache.c creates for
108 : * pg_database. In more typical cases, relcache.c was able to load
109 : * descriptors for both pg_database and its indexes from the shared relcache
110 : * cache file, and so we can do an indexscan. criticalSharedRelcachesBuilt
111 : * tells whether we got the cached descriptors.
112 : */
113 : static HeapTuple
114 13827 : GetDatabaseTuple(const char *dbname)
115 : {
116 : HeapTuple tuple;
117 : Relation relation;
118 : SysScanDesc scan;
119 : ScanKeyData key[1];
120 :
121 : /*
122 : * form a scan key
123 : */
124 13827 : ScanKeyInit(&key[0],
125 : Anum_pg_database_datname,
126 : BTEqualStrategyNumber, F_NAMEEQ,
127 : CStringGetDatum(dbname));
128 :
129 : /*
130 : * Open pg_database and fetch a tuple. Force heap scan if we haven't yet
131 : * built the critical shared relcache entries (i.e., we're starting up
132 : * without a shared relcache cache file).
133 : */
134 13827 : relation = table_open(DatabaseRelationId, AccessShareLock);
135 13827 : scan = systable_beginscan(relation, DatabaseNameIndexId,
136 : criticalSharedRelcachesBuilt,
137 : NULL,
138 : 1, key);
139 :
140 13827 : tuple = systable_getnext(scan);
141 :
142 : /* Must copy tuple before releasing buffer */
143 13827 : if (HeapTupleIsValid(tuple))
144 13817 : tuple = heap_copytuple(tuple);
145 :
146 : /* all done */
147 13827 : systable_endscan(scan);
148 13827 : table_close(relation, AccessShareLock);
149 :
150 13827 : return tuple;
151 : }
152 :
153 : /*
154 : * GetDatabaseTupleByOid -- as above, but search by database OID
155 : */
156 : static HeapTuple
157 17917 : GetDatabaseTupleByOid(Oid dboid)
158 : {
159 : HeapTuple tuple;
160 : Relation relation;
161 : SysScanDesc scan;
162 : ScanKeyData key[1];
163 :
164 : /*
165 : * form a scan key
166 : */
167 17917 : ScanKeyInit(&key[0],
168 : Anum_pg_database_oid,
169 : BTEqualStrategyNumber, F_OIDEQ,
170 : ObjectIdGetDatum(dboid));
171 :
172 : /*
173 : * Open pg_database and fetch a tuple. Force heap scan if we haven't yet
174 : * built the critical shared relcache entries (i.e., we're starting up
175 : * without a shared relcache cache file).
176 : */
177 17917 : relation = table_open(DatabaseRelationId, AccessShareLock);
178 17917 : scan = systable_beginscan(relation, DatabaseOidIndexId,
179 : criticalSharedRelcachesBuilt,
180 : NULL,
181 : 1, key);
182 :
183 17917 : tuple = systable_getnext(scan);
184 :
185 : /* Must copy tuple before releasing buffer */
186 17917 : if (HeapTupleIsValid(tuple))
187 17917 : tuple = heap_copytuple(tuple);
188 :
189 : /* all done */
190 17917 : systable_endscan(scan);
191 17917 : table_close(relation, AccessShareLock);
192 :
193 17917 : return tuple;
194 : }
195 :
196 :
197 : /*
198 : * PerformAuthentication -- authenticate a remote client
199 : *
200 : * returns: nothing. Will not return at all if there's any failure.
201 : */
202 : static void
203 14314 : PerformAuthentication(Port *port)
204 : {
205 : /* This should be set already, but let's make sure */
206 14314 : ClientAuthInProgress = true; /* limit visibility of log messages */
207 :
208 : /*
209 : * In EXEC_BACKEND case, we didn't inherit the contents of pg_hba.conf
210 : * etcetera from the postmaster, and have to load them ourselves.
211 : *
212 : * FIXME: [fork/exec] Ugh. Is there a way around this overhead?
213 : */
214 : #ifdef EXEC_BACKEND
215 :
216 : /*
217 : * load_hba() and load_ident() want to work within the PostmasterContext,
218 : * so create that if it doesn't exist (which it won't). We'll delete it
219 : * again later, in PostgresMain.
220 : */
221 : if (PostmasterContext == NULL)
222 : PostmasterContext = AllocSetContextCreate(TopMemoryContext,
223 : "Postmaster",
224 : ALLOCSET_DEFAULT_SIZES);
225 :
226 : if (!load_hba())
227 : {
228 : /*
229 : * It makes no sense to continue if we fail to load the HBA file,
230 : * since there is no way to connect to the database in this case.
231 : */
232 : ereport(FATAL,
233 : /* translator: %s is a configuration file */
234 : (errmsg("could not load %s", HbaFileName)));
235 : }
236 :
237 : if (!load_ident())
238 : {
239 : /*
240 : * It is ok to continue if we fail to load the IDENT file, although it
241 : * means that you cannot log in using any of the authentication
242 : * methods that need a user name mapping. load_ident() already logged
243 : * the details of error to the log.
244 : */
245 : }
246 : #endif
247 :
248 : /* Capture authentication start time for logging */
249 14314 : conn_timing.auth_start = GetCurrentTimestamp();
250 :
251 : /*
252 : * Set up a timeout in case a buggy or malicious client fails to respond
253 : * during authentication. Since we're inside a transaction and might do
254 : * database access, we have to use the statement_timeout infrastructure.
255 : */
256 14314 : enable_timeout_after(STATEMENT_TIMEOUT, AuthenticationTimeout * 1000);
257 :
258 : /*
259 : * Now perform authentication exchange.
260 : */
261 14314 : set_ps_display("authentication");
262 14314 : ClientAuthentication(port); /* might not return, if failure */
263 :
264 : /*
265 : * Done with authentication. Disable the timeout, and log if needed.
266 : */
267 14240 : disable_timeout(STATEMENT_TIMEOUT, false);
268 :
269 : /* Capture authentication end time for logging */
270 14240 : conn_timing.auth_end = GetCurrentTimestamp();
271 :
272 14240 : if (log_connections & LOG_CONNECTION_AUTHORIZATION)
273 : {
274 : StringInfoData logmsg;
275 :
276 242 : initStringInfo(&logmsg);
277 242 : if (am_walsender)
278 0 : appendStringInfo(&logmsg, _("replication connection authorized: user=%s"),
279 : port->user_name);
280 : else
281 242 : appendStringInfo(&logmsg, _("connection authorized: user=%s"),
282 : port->user_name);
283 242 : if (!am_walsender)
284 242 : appendStringInfo(&logmsg, _(" database=%s"), port->database_name);
285 :
286 242 : if (port->application_name != NULL)
287 242 : appendStringInfo(&logmsg, _(" application_name=%s"),
288 : port->application_name);
289 :
290 : #ifdef USE_SSL
291 242 : if (port->ssl_in_use)
292 111 : appendStringInfo(&logmsg, _(" SSL enabled (protocol=%s, cipher=%s, bits=%d)"),
293 : be_tls_get_version(port),
294 : be_tls_get_cipher(port),
295 : be_tls_get_cipher_bits(port));
296 : #endif
297 : #ifdef ENABLE_GSS
298 : if (port->gss)
299 : {
300 : const char *princ = be_gssapi_get_princ(port);
301 :
302 : if (princ)
303 : appendStringInfo(&logmsg,
304 : _(" GSS (authenticated=%s, encrypted=%s, delegated_credentials=%s, principal=%s)"),
305 : be_gssapi_get_auth(port) ? _("yes") : _("no"),
306 : be_gssapi_get_enc(port) ? _("yes") : _("no"),
307 : be_gssapi_get_delegation(port) ? _("yes") : _("no"),
308 : princ);
309 : else
310 : appendStringInfo(&logmsg,
311 : _(" GSS (authenticated=%s, encrypted=%s, delegated_credentials=%s)"),
312 : be_gssapi_get_auth(port) ? _("yes") : _("no"),
313 : be_gssapi_get_enc(port) ? _("yes") : _("no"),
314 : be_gssapi_get_delegation(port) ? _("yes") : _("no"));
315 : }
316 : #endif
317 :
318 242 : ereport(LOG, errmsg_internal("%s", logmsg.data));
319 242 : pfree(logmsg.data);
320 : }
321 :
322 14240 : set_ps_display("startup");
323 :
324 14240 : ClientAuthInProgress = false; /* client_min_messages is active now */
325 14240 : }
326 :
327 :
328 : /*
329 : * CheckMyDatabase -- fetch information from the pg_database entry for our DB
330 : */
331 : static void
332 17910 : CheckMyDatabase(const char *name, bool am_superuser, bool override_allow_connections)
333 : {
334 : HeapTuple tup;
335 : Form_pg_database dbform;
336 : Datum datum;
337 : bool isnull;
338 : char *collate;
339 : char *ctype;
340 :
341 : /* Fetch our pg_database row normally, via syscache */
342 17910 : tup = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(MyDatabaseId));
343 17910 : if (!HeapTupleIsValid(tup))
344 0 : elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
345 17910 : dbform = (Form_pg_database) GETSTRUCT(tup);
346 :
347 : /* This recheck is strictly paranoia */
348 17910 : if (strcmp(name, NameStr(dbform->datname)) != 0)
349 0 : ereport(FATAL,
350 : (errcode(ERRCODE_UNDEFINED_DATABASE),
351 : errmsg("database \"%s\" has disappeared from pg_database",
352 : name),
353 : errdetail("Database OID %u now seems to belong to \"%s\".",
354 : MyDatabaseId, NameStr(dbform->datname))));
355 :
356 : /*
357 : * Check permissions to connect to the database.
358 : *
359 : * These checks are not enforced when in standalone mode, so that there is
360 : * a way to recover from disabling all access to all databases, for
361 : * example "UPDATE pg_database SET datallowconn = false;".
362 : */
363 17910 : if (IsUnderPostmaster)
364 : {
365 : /*
366 : * Check that the database is currently allowing connections.
367 : * (Background processes can override this test and the next one by
368 : * setting override_allow_connections.)
369 : */
370 17840 : if (!dbform->datallowconn && !override_allow_connections)
371 1 : ereport(FATAL,
372 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
373 : errmsg("database \"%s\" is not currently accepting connections",
374 : name)));
375 :
376 : /*
377 : * Check privilege to connect to the database. (The am_superuser test
378 : * is redundant, but since we have the flag, might as well check it
379 : * and save a few cycles.)
380 : */
381 18148 : if (!am_superuser && !override_allow_connections &&
382 309 : object_aclcheck(DatabaseRelationId, MyDatabaseId, GetUserId(),
383 : ACL_CONNECT) != ACLCHECK_OK)
384 0 : ereport(FATAL,
385 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
386 : errmsg("permission denied for database \"%s\"", name),
387 : errdetail("User does not have CONNECT privilege.")));
388 :
389 : /*
390 : * Check connection limit for this database. We enforce the limit
391 : * only for regular backends, since other process types have their own
392 : * PGPROC pools.
393 : *
394 : * There is a race condition here --- we create our PGPROC before
395 : * checking for other PGPROCs. If two backends did this at about the
396 : * same time, they might both think they were over the limit, while
397 : * ideally one should succeed and one fail. Getting that to work
398 : * exactly seems more trouble than it is worth, however; instead we
399 : * just document that the connection limit is approximate.
400 : */
401 17839 : if (dbform->datconnlimit >= 0 &&
402 0 : AmRegularBackendProcess() &&
403 0 : !am_superuser &&
404 0 : CountDBConnections(MyDatabaseId) > dbform->datconnlimit)
405 0 : ereport(FATAL,
406 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
407 : errmsg("too many connections for database \"%s\"",
408 : name)));
409 : }
410 :
411 : /*
412 : * OK, we're golden. Next to-do item is to save the encoding info out of
413 : * the pg_database tuple.
414 : */
415 17909 : SetDatabaseEncoding(dbform->encoding);
416 : /* Record it as a GUC internal option, too */
417 17909 : SetConfigOption("server_encoding", GetDatabaseEncodingName(),
418 : PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
419 : /* If we have no other source of client_encoding, use server encoding */
420 17909 : SetConfigOption("client_encoding", GetDatabaseEncodingName(),
421 : PGC_BACKEND, PGC_S_DYNAMIC_DEFAULT);
422 :
423 : /* assign locale variables */
424 17909 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datcollate);
425 17909 : collate = TextDatumGetCString(datum);
426 17909 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datctype);
427 17909 : ctype = TextDatumGetCString(datum);
428 :
429 : /*
430 : * Historically, we set LC_COLLATE from datcollate, as well. That's no
431 : * longer necessary because all collation behavior is handled through
432 : * pg_locale_t.
433 : */
434 :
435 17909 : if (pg_perm_setlocale(LC_CTYPE, ctype) == NULL)
436 0 : ereport(FATAL,
437 : (errmsg("database locale is incompatible with operating system"),
438 : errdetail("The database was initialized with LC_CTYPE \"%s\", "
439 : " which is not recognized by setlocale().", ctype),
440 : errhint("Recreate the database with another locale or install the missing locale.")));
441 :
442 17909 : init_database_collation();
443 :
444 : /*
445 : * Check collation version. See similar code in
446 : * pg_newlocale_from_collation(). Note that here we warn instead of error
447 : * in any case, so that we don't prevent connecting.
448 : */
449 17907 : datum = SysCacheGetAttr(DATABASEOID, tup, Anum_pg_database_datcollversion,
450 : &isnull);
451 17907 : if (!isnull)
452 : {
453 : char *actual_versionstr;
454 : char *collversionstr;
455 : char *locale;
456 :
457 17083 : collversionstr = TextDatumGetCString(datum);
458 :
459 17083 : if (dbform->datlocprovider == COLLPROVIDER_LIBC)
460 16159 : locale = collate;
461 : else
462 : {
463 924 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datlocale);
464 924 : locale = TextDatumGetCString(datum);
465 : }
466 :
467 17083 : actual_versionstr = get_collation_actual_version(dbform->datlocprovider, locale);
468 17083 : if (!actual_versionstr)
469 : /* should not happen */
470 0 : elog(WARNING,
471 : "database \"%s\" has no actual collation version, but a version was recorded",
472 : name);
473 17083 : else if (strcmp(actual_versionstr, collversionstr) != 0)
474 0 : ereport(WARNING,
475 : (errmsg("database \"%s\" has a collation version mismatch",
476 : name),
477 : errdetail("The database was created using collation version %s, "
478 : "but the operating system provides version %s.",
479 : collversionstr, actual_versionstr),
480 : errhint("Rebuild all objects in this database that use the default collation and run "
481 : "ALTER DATABASE %s REFRESH COLLATION VERSION, "
482 : "or build PostgreSQL with the right library version.",
483 : quote_identifier(name))));
484 : }
485 :
486 17907 : ReleaseSysCache(tup);
487 17907 : }
488 :
489 :
490 : /*
491 : * pg_split_opts -- split a string of options and append it to an argv array
492 : *
493 : * The caller is responsible for ensuring the argv array is large enough. The
494 : * maximum possible number of arguments added by this routine is
495 : * (strlen(optstr) + 1) / 2.
496 : *
497 : * Because some option values can contain spaces we allow escaping using
498 : * backslashes, with \\ representing a literal backslash.
499 : */
500 : void
501 4298 : pg_split_opts(char **argv, int *argcp, const char *optstr)
502 : {
503 : StringInfoData s;
504 :
505 4298 : initStringInfo(&s);
506 :
507 15690 : while (*optstr)
508 : {
509 11392 : bool last_was_escape = false;
510 :
511 11392 : resetStringInfo(&s);
512 :
513 : /* skip over leading space */
514 21801 : while (isspace((unsigned char) *optstr))
515 10409 : optstr++;
516 :
517 11392 : if (*optstr == '\0')
518 0 : break;
519 :
520 : /*
521 : * Parse a single option, stopping at the first space, unless it's
522 : * escaped.
523 : */
524 174290 : while (*optstr)
525 : {
526 169992 : if (isspace((unsigned char) *optstr) && !last_was_escape)
527 7094 : break;
528 :
529 162898 : if (!last_was_escape && *optstr == '\\')
530 20 : last_was_escape = true;
531 : else
532 : {
533 162878 : last_was_escape = false;
534 162878 : appendStringInfoChar(&s, *optstr);
535 : }
536 :
537 162898 : optstr++;
538 : }
539 :
540 : /* now store the option in the next argv[] position */
541 11392 : argv[(*argcp)++] = pstrdup(s.data);
542 : }
543 :
544 4298 : pfree(s.data);
545 4298 : }
546 :
547 : /*
548 : * Initialize MaxBackends value from config options.
549 : *
550 : * This must be called after modules have had the chance to alter GUCs in
551 : * shared_preload_libraries and before shared memory size is determined.
552 : *
553 : * Note that in EXEC_BACKEND environment, the value is passed down from
554 : * postmaster to subprocesses via BackendParameters in SubPostmasterMain; only
555 : * postmaster itself and processes not under postmaster control should call
556 : * this.
557 : */
558 : void
559 1178 : InitializeMaxBackends(void)
560 : {
561 : Assert(MaxBackends == 0);
562 :
563 : /* Note that this does not include "auxiliary" processes */
564 1178 : MaxBackends = MaxConnections + autovacuum_worker_slots +
565 1178 : max_worker_processes + max_wal_senders + NUM_SPECIAL_WORKER_PROCS;
566 :
567 1178 : if (MaxBackends > MAX_BACKENDS)
568 0 : ereport(ERROR,
569 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
570 : errmsg("too many server processes configured"),
571 : errdetail("\"max_connections\" (%d) plus \"autovacuum_worker_slots\" (%d) plus \"max_worker_processes\" (%d) plus \"max_wal_senders\" (%d) must be less than %d.",
572 : MaxConnections, autovacuum_worker_slots,
573 : max_worker_processes, max_wal_senders,
574 : MAX_BACKENDS - (NUM_SPECIAL_WORKER_PROCS - 1))));
575 1178 : }
576 :
577 : /*
578 : * Initialize the number of fast-path lock slots in PGPROC.
579 : *
580 : * This must be called after modules have had the chance to alter GUCs in
581 : * shared_preload_libraries and before shared memory size is determined.
582 : */
583 : void
584 1178 : InitializeFastPathLocks(void)
585 : {
586 : /* Should be initialized only once. */
587 : Assert(FastPathLockGroupsPerBackend == 0);
588 :
589 : /*
590 : * Based on the max_locks_per_transaction GUC, as that's a good indicator
591 : * of the expected number of locks, figure out the value for
592 : * FastPathLockGroupsPerBackend. This must be a power-of-two. We cap the
593 : * value at FP_LOCK_GROUPS_PER_BACKEND_MAX and insist the value is at
594 : * least 1.
595 : *
596 : * The default max_locks_per_transaction = 64 means 4 groups by default.
597 : */
598 1178 : FastPathLockGroupsPerBackend =
599 1178 : Max(Min(pg_nextpower2_32(max_locks_per_xact) / FP_LOCK_SLOTS_PER_GROUP,
600 : FP_LOCK_GROUPS_PER_BACKEND_MAX), 1);
601 :
602 : /* Validate we did get a power-of-two */
603 : Assert(FastPathLockGroupsPerBackend ==
604 : pg_nextpower2_32(FastPathLockGroupsPerBackend));
605 1178 : }
606 :
607 : /*
608 : * Early initialization of a backend (either standalone or under postmaster).
609 : * This happens even before InitPostgres.
610 : *
611 : * This is separate from InitPostgres because it is also called by auxiliary
612 : * processes, such as the background writer process, which may not call
613 : * InitPostgres at all.
614 : */
615 : void
616 24284 : BaseInit(void)
617 : {
618 : Assert(MyProc != NULL);
619 :
620 : /*
621 : * Initialize our input/output/debugging file descriptors.
622 : */
623 24284 : DebugFileOpen();
624 :
625 : /*
626 : * Initialize file access. Done early so other subsystems can access
627 : * files.
628 : */
629 24284 : InitFileAccess();
630 :
631 : /*
632 : * Initialize statistics reporting. This needs to happen early to ensure
633 : * that pgstat's shutdown callback runs after the shutdown callbacks of
634 : * all subsystems that can produce stats (like e.g. transaction commits
635 : * can).
636 : */
637 24284 : pgstat_initialize();
638 :
639 : /*
640 : * Initialize AIO before infrastructure that might need to actually
641 : * execute AIO.
642 : */
643 24284 : pgaio_init_backend();
644 :
645 : /* Do local initialization of storage and buffer managers */
646 24284 : InitSync();
647 24284 : smgrinit();
648 24284 : InitBufferManagerAccess();
649 :
650 : /*
651 : * Initialize temporary file access after pgstat, so that the temporary
652 : * file shutdown hook can report temporary file statistics.
653 : */
654 24284 : InitTemporaryFileAccess();
655 :
656 : /*
657 : * Initialize local buffers for WAL record construction, in case we ever
658 : * try to insert XLOG.
659 : */
660 24284 : InitXLogInsert();
661 :
662 : /* Initialize lock manager's local structs */
663 24284 : InitLockManagerAccess();
664 :
665 : /* Initialize logical info WAL logging state */
666 24284 : InitializeProcessXLogLogicalInfo();
667 :
668 : /*
669 : * Initialize replication slots after pgstat. The exit hook might need to
670 : * drop ephemeral slots, which in turn triggers stats reporting.
671 : */
672 24284 : ReplicationSlotInitialize();
673 24284 : }
674 :
675 :
676 : /* --------------------------------
677 : * InitPostgres
678 : * Initialize POSTGRES.
679 : *
680 : * Parameters:
681 : * in_dbname, dboid: specify database to connect to, as described below
682 : * username, useroid: specify role to connect as, as described below
683 : * flags:
684 : * - INIT_PG_LOAD_SESSION_LIBS to honor [session|local]_preload_libraries.
685 : * - INIT_PG_OVERRIDE_ALLOW_CONNS to connect despite !datallowconn.
686 : * - INIT_PG_OVERRIDE_ROLE_LOGIN to connect despite !rolcanlogin.
687 : * out_dbname: optional output parameter, see below; pass NULL if not used
688 : *
689 : * The database can be specified by name, using the in_dbname parameter, or by
690 : * OID, using the dboid parameter. Specify NULL or InvalidOid respectively
691 : * for the unused parameter. If dboid is provided, the actual database
692 : * name can be returned to the caller in out_dbname. If out_dbname isn't
693 : * NULL, it must point to a buffer of size NAMEDATALEN.
694 : *
695 : * Similarly, the role can be passed by name, using the username parameter,
696 : * or by OID using the useroid parameter.
697 : *
698 : * In bootstrap mode the database and username parameters are NULL/InvalidOid.
699 : * The autovacuum launcher process doesn't specify these parameters either,
700 : * because it only goes far enough to be able to read pg_database; it doesn't
701 : * connect to any particular database. An autovacuum worker specifies a
702 : * database but not a username; conversely, a physical walsender specifies
703 : * username but not database.
704 : *
705 : * By convention, INIT_PG_LOAD_SESSION_LIBS should be passed in "flags" in
706 : * "interactive" sessions (including standalone backends), but not in
707 : * background processes such as autovacuum. Note in particular that it
708 : * shouldn't be true in parallel worker processes; those have another
709 : * mechanism for replicating their leader's set of loaded libraries.
710 : *
711 : * We expect that InitProcess() was already called, so we already have a
712 : * PGPROC struct ... but it's not completely filled in yet.
713 : *
714 : * Note:
715 : * Be very careful with the order of calls in the InitPostgres function.
716 : * --------------------------------
717 : */
718 : void
719 19482 : InitPostgres(const char *in_dbname, Oid dboid,
720 : const char *username, Oid useroid,
721 : bits32 flags,
722 : char *out_dbname)
723 : {
724 19482 : bool bootstrap = IsBootstrapProcessingMode();
725 : bool am_superuser;
726 : char *fullpath;
727 : char dbname[NAMEDATALEN];
728 19482 : int nfree = 0;
729 :
730 19482 : elog(DEBUG3, "InitPostgres");
731 :
732 : /*
733 : * Add my PGPROC struct to the ProcArray.
734 : *
735 : * Once I have done this, I am visible to other backends!
736 : */
737 19482 : InitProcessPhase2();
738 :
739 : /* Initialize status reporting */
740 19482 : pgstat_beinit();
741 :
742 : /*
743 : * And initialize an entry in the PgBackendStatus array. That way, if
744 : * LWLocks or third-party authentication should happen to hang, it is
745 : * possible to retrieve some information about what is going on.
746 : */
747 19482 : if (!bootstrap)
748 : {
749 19431 : pgstat_bestart_initial();
750 19431 : INJECTION_POINT("init-pre-auth", NULL);
751 : }
752 :
753 : /*
754 : * Initialize my entry in the shared-invalidation manager's array of
755 : * per-backend data.
756 : */
757 19482 : SharedInvalBackendInit(false);
758 :
759 19482 : ProcSignalInit(MyCancelKey, MyCancelKeyLength);
760 :
761 : /*
762 : * Also set up timeout handlers needed for backend operation. We need
763 : * these in every case except bootstrap.
764 : */
765 19482 : if (!bootstrap)
766 : {
767 19431 : RegisterTimeout(DEADLOCK_TIMEOUT, CheckDeadLockAlert);
768 19431 : RegisterTimeout(STATEMENT_TIMEOUT, StatementTimeoutHandler);
769 19431 : RegisterTimeout(LOCK_TIMEOUT, LockTimeoutHandler);
770 19431 : RegisterTimeout(IDLE_IN_TRANSACTION_SESSION_TIMEOUT,
771 : IdleInTransactionSessionTimeoutHandler);
772 19431 : RegisterTimeout(TRANSACTION_TIMEOUT, TransactionTimeoutHandler);
773 19431 : RegisterTimeout(IDLE_SESSION_TIMEOUT, IdleSessionTimeoutHandler);
774 19431 : RegisterTimeout(CLIENT_CONNECTION_CHECK_TIMEOUT, ClientCheckTimeoutHandler);
775 19431 : RegisterTimeout(IDLE_STATS_UPDATE_TIMEOUT,
776 : IdleStatsUpdateTimeoutHandler);
777 : }
778 :
779 : /*
780 : * If this is either a bootstrap process or a standalone backend, start up
781 : * the XLOG machinery, and register to have it closed down at exit. In
782 : * other cases, the startup process is responsible for starting up the
783 : * XLOG machinery, and the checkpointer for closing it down.
784 : */
785 19482 : if (!IsUnderPostmaster)
786 : {
787 : /*
788 : * We don't yet have an aux-process resource owner, but StartupXLOG
789 : * and ShutdownXLOG will need one. Hence, create said resource owner
790 : * (and register a callback to clean it up after ShutdownXLOG runs).
791 : */
792 121 : CreateAuxProcessResourceOwner();
793 :
794 121 : StartupXLOG();
795 : /* Release (and warn about) any buffer pins leaked in StartupXLOG */
796 121 : ReleaseAuxProcessResources(true);
797 : /* Reset CurrentResourceOwner to nothing for the moment */
798 121 : CurrentResourceOwner = NULL;
799 :
800 : /*
801 : * Use before_shmem_exit() so that ShutdownXLOG() can rely on DSM
802 : * segments etc to work (which in turn is required for pgstats).
803 : */
804 121 : before_shmem_exit(pgstat_before_server_shutdown, 0);
805 121 : before_shmem_exit(ShutdownXLOG, 0);
806 : }
807 :
808 : /*
809 : * Initialize the relation cache and the system catalog caches. Note that
810 : * no catalog access happens here; we only set up the hashtable structure.
811 : * We must do this before starting a transaction because transaction abort
812 : * would try to touch these hashtables.
813 : */
814 19482 : RelationCacheInitialize();
815 19482 : InitCatalogCache();
816 19482 : InitPlanCache();
817 :
818 : /* Initialize portal manager */
819 19482 : EnablePortalManager();
820 :
821 : /*
822 : * Load relcache entries for the shared system catalogs. This must create
823 : * at least entries for pg_database and catalogs used for authentication.
824 : */
825 19482 : RelationCacheInitializePhase2();
826 :
827 : /*
828 : * Set up process-exit callback to do pre-shutdown cleanup. This is one
829 : * of the first before_shmem_exit callbacks we register; thus, this will
830 : * be one of the last things we do before low-level modules like the
831 : * buffer manager begin to close down. We need to have this in place
832 : * before we begin our first transaction --- if we fail during the
833 : * initialization transaction, as is entirely possible, we need the
834 : * AbortTransaction call to clean up.
835 : */
836 19482 : before_shmem_exit(ShutdownPostgres, 0);
837 :
838 : /* The autovacuum launcher is done here */
839 19482 : if (AmAutoVacuumLauncherProcess())
840 : {
841 : /* fill in the remainder of this entry in the PgBackendStatus array */
842 454 : pgstat_bestart_final();
843 :
844 1422 : return;
845 : }
846 :
847 : /*
848 : * Start a new transaction here before first access to db.
849 : */
850 19028 : if (!bootstrap)
851 : {
852 : /* statement_timestamp must be set for timeouts to work correctly */
853 18977 : SetCurrentStatementStartTimestamp();
854 18977 : StartTransactionCommand();
855 :
856 : /*
857 : * transaction_isolation will have been set to the default by the
858 : * above. If the default is "serializable", and we are in hot
859 : * standby, we will fail if we don't change it to something lower.
860 : * Fortunately, "read committed" is plenty good enough.
861 : */
862 18977 : XactIsoLevel = XACT_READ_COMMITTED;
863 : }
864 :
865 : /*
866 : * Perform client authentication if necessary, then figure out our
867 : * postgres user ID, and see if we are a superuser.
868 : *
869 : * In standalone mode, autovacuum worker processes and slot sync worker
870 : * process, we use a fixed ID, otherwise we figure it out from the
871 : * authenticated user name.
872 : */
873 19028 : if (bootstrap || AmAutoVacuumWorkerProcess() || AmLogicalSlotSyncWorkerProcess())
874 : {
875 1555 : InitializeSessionUserIdStandalone();
876 1555 : am_superuser = true;
877 : }
878 17473 : else if (!IsUnderPostmaster)
879 : {
880 70 : InitializeSessionUserIdStandalone();
881 70 : am_superuser = true;
882 70 : if (!ThereIsAtLeastOneRole())
883 0 : ereport(WARNING,
884 : (errcode(ERRCODE_UNDEFINED_OBJECT),
885 : errmsg("no roles are defined in this database system"),
886 : errhint("You should immediately run CREATE USER \"%s\" SUPERUSER;.",
887 : username != NULL ? username : "postgres")));
888 : }
889 17403 : else if (AmBackgroundWorkerProcess())
890 : {
891 3089 : if (username == NULL && !OidIsValid(useroid))
892 : {
893 493 : InitializeSessionUserIdStandalone();
894 493 : am_superuser = true;
895 : }
896 : else
897 : {
898 2596 : InitializeSessionUserId(username, useroid,
899 2596 : (flags & INIT_PG_OVERRIDE_ROLE_LOGIN) != 0);
900 2594 : am_superuser = superuser();
901 : }
902 : }
903 : else
904 : {
905 : /* normal multiuser case */
906 : Assert(MyProcPort != NULL);
907 14314 : PerformAuthentication(MyProcPort);
908 14240 : InitializeSessionUserId(username, useroid, false);
909 : /* ensure that auth_method is actually valid, aka authn_id is not NULL */
910 14236 : if (MyClientConnectionInfo.authn_id)
911 129 : InitializeSystemUser(MyClientConnectionInfo.authn_id,
912 : hba_authname(MyClientConnectionInfo.auth_method));
913 14236 : am_superuser = superuser();
914 : }
915 :
916 : /* Report any SSL/GSS details for the session. */
917 18948 : if (MyProcPort != NULL)
918 : {
919 : Assert(!bootstrap);
920 :
921 14236 : pgstat_bestart_security();
922 : }
923 :
924 : /*
925 : * Binary upgrades only allowed super-user connections
926 : */
927 18948 : if (IsBinaryUpgrade && !am_superuser)
928 : {
929 0 : ereport(FATAL,
930 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
931 : errmsg("must be superuser to connect in binary upgrade mode")));
932 : }
933 :
934 : /*
935 : * The last few regular connection slots are reserved for superusers and
936 : * roles with privileges of pg_use_reserved_connections. We do not apply
937 : * these limits to background processes, since they all have their own
938 : * pools of PGPROC slots.
939 : *
940 : * Note: At this point, the new backend has already claimed a proc struct,
941 : * so we must check whether the number of free slots is strictly less than
942 : * the reserved connection limits.
943 : */
944 18948 : if (AmRegularBackendProcess() && !am_superuser &&
945 276 : (SuperuserReservedConnections + ReservedConnections) > 0 &&
946 276 : !HaveNFreeProcs(SuperuserReservedConnections + ReservedConnections, &nfree))
947 : {
948 4 : if (nfree < SuperuserReservedConnections)
949 1 : ereport(FATAL,
950 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
951 : errmsg("remaining connection slots are reserved for roles with the %s attribute",
952 : "SUPERUSER")));
953 :
954 3 : if (!has_privs_of_role(GetUserId(), ROLE_PG_USE_RESERVED_CONNECTIONS))
955 1 : ereport(FATAL,
956 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
957 : errmsg("remaining connection slots are reserved for roles with privileges of the \"%s\" role",
958 : "pg_use_reserved_connections")));
959 : }
960 :
961 : /* Check replication permissions needed for walsender processes. */
962 18946 : if (am_walsender)
963 : {
964 : Assert(!bootstrap);
965 :
966 1260 : if (!has_rolreplication(GetUserId()))
967 0 : ereport(FATAL,
968 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
969 : errmsg("permission denied to start WAL sender"),
970 : errdetail("Only roles with the %s attribute may start a WAL sender process.",
971 : "REPLICATION")));
972 : }
973 :
974 : /*
975 : * If this is a plain walsender only supporting physical replication, we
976 : * don't want to connect to any particular database. Just finish the
977 : * backend startup by processing any options from the startup packet, and
978 : * we're done.
979 : */
980 18946 : if (am_walsender && !am_db_walsender)
981 : {
982 : /* process any options passed in the startup packet */
983 482 : if (MyProcPort != NULL)
984 482 : process_startup_options(MyProcPort, am_superuser);
985 :
986 : /* Apply PostAuthDelay as soon as we've read all options */
987 482 : if (PostAuthDelay > 0)
988 0 : pg_usleep(PostAuthDelay * 1000000L);
989 :
990 : /* initialize client encoding */
991 482 : InitializeClientEncoding();
992 :
993 : /* fill in the remainder of this entry in the PgBackendStatus array */
994 482 : pgstat_bestart_final();
995 :
996 : /* close the transaction we started above */
997 482 : CommitTransactionCommand();
998 :
999 : /* send any WARNINGs we've accumulated during initialization */
1000 482 : EmitConnectionWarnings();
1001 :
1002 482 : return;
1003 : }
1004 :
1005 : /*
1006 : * Set up the global variables holding database id and default tablespace.
1007 : * But note we won't actually try to touch the database just yet.
1008 : *
1009 : * We take a shortcut in the bootstrap case, otherwise we have to look up
1010 : * the db's entry in pg_database.
1011 : */
1012 18464 : if (bootstrap)
1013 : {
1014 51 : dboid = Template1DbOid;
1015 51 : MyDatabaseTableSpace = DEFAULTTABLESPACE_OID;
1016 : }
1017 18413 : else if (in_dbname != NULL)
1018 : {
1019 : HeapTuple tuple;
1020 : Form_pg_database dbform;
1021 :
1022 13827 : tuple = GetDatabaseTuple(in_dbname);
1023 13827 : if (!HeapTupleIsValid(tuple))
1024 10 : ereport(FATAL,
1025 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1026 : errmsg("database \"%s\" does not exist", in_dbname)));
1027 13817 : dbform = (Form_pg_database) GETSTRUCT(tuple);
1028 13817 : dboid = dbform->oid;
1029 : }
1030 4586 : else if (!OidIsValid(dboid))
1031 : {
1032 : /*
1033 : * If this is a background worker not bound to any particular
1034 : * database, we're done now. Everything that follows only makes sense
1035 : * if we are bound to a specific database. We do need to close the
1036 : * transaction we started before returning.
1037 : */
1038 486 : if (!bootstrap)
1039 : {
1040 486 : pgstat_bestart_final();
1041 486 : CommitTransactionCommand();
1042 : }
1043 486 : return;
1044 : }
1045 :
1046 : /*
1047 : * Now, take a writer's lock on the database we are trying to connect to.
1048 : * If there is a concurrently running DROP DATABASE on that database, this
1049 : * will block us until it finishes (and has committed its update of
1050 : * pg_database).
1051 : *
1052 : * Note that the lock is not held long, only until the end of this startup
1053 : * transaction. This is OK since we will advertise our use of the
1054 : * database in the ProcArray before dropping the lock (in fact, that's the
1055 : * next thing to do). Anyone trying a DROP DATABASE after this point will
1056 : * see us in the array once they have the lock. Ordering is important for
1057 : * this because we don't want to advertise ourselves as being in this
1058 : * database until we have the lock; otherwise we create what amounts to a
1059 : * deadlock with CountOtherDBBackends().
1060 : *
1061 : * Note: use of RowExclusiveLock here is reasonable because we envision
1062 : * our session as being a concurrent writer of the database. If we had a
1063 : * way of declaring a session as being guaranteed-read-only, we could use
1064 : * AccessShareLock for such sessions and thereby not conflict against
1065 : * CREATE DATABASE.
1066 : */
1067 17968 : if (!bootstrap)
1068 17917 : LockSharedObject(DatabaseRelationId, dboid, 0, RowExclusiveLock);
1069 :
1070 : /*
1071 : * Recheck pg_database to make sure the target database hasn't gone away.
1072 : * If there was a concurrent DROP DATABASE, this ensures we will die
1073 : * cleanly without creating a mess.
1074 : */
1075 17968 : if (!bootstrap)
1076 : {
1077 : HeapTuple tuple;
1078 : Form_pg_database datform;
1079 :
1080 17917 : tuple = GetDatabaseTupleByOid(dboid);
1081 17917 : if (HeapTupleIsValid(tuple))
1082 17917 : datform = (Form_pg_database) GETSTRUCT(tuple);
1083 :
1084 17917 : if (!HeapTupleIsValid(tuple) ||
1085 13817 : (in_dbname && namestrcmp(&datform->datname, in_dbname)))
1086 : {
1087 0 : if (in_dbname)
1088 0 : ereport(FATAL,
1089 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1090 : errmsg("database \"%s\" does not exist", in_dbname),
1091 : errdetail("It seems to have just been dropped or renamed.")));
1092 : else
1093 0 : ereport(FATAL,
1094 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1095 : errmsg("database %u does not exist", dboid)));
1096 : }
1097 :
1098 17917 : strlcpy(dbname, NameStr(datform->datname), sizeof(dbname));
1099 :
1100 17917 : if (database_is_invalid_form(datform))
1101 : {
1102 6 : ereport(FATAL,
1103 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1104 : errmsg("cannot connect to invalid database \"%s\"", dbname),
1105 : errhint("Use DROP DATABASE to drop invalid databases."));
1106 : }
1107 :
1108 17911 : MyDatabaseTableSpace = datform->dattablespace;
1109 17911 : MyDatabaseHasLoginEventTriggers = datform->dathasloginevt;
1110 : /* pass the database name back to the caller */
1111 17911 : if (out_dbname)
1112 1499 : strcpy(out_dbname, dbname);
1113 : }
1114 :
1115 : /*
1116 : * Now that we rechecked, we are certain to be connected to a database and
1117 : * thus can set MyDatabaseId.
1118 : *
1119 : * It is important that MyDatabaseId only be set once we are sure that the
1120 : * target database can no longer be concurrently dropped or renamed. For
1121 : * example, without this guarantee, pgstat_update_dbstats() could create
1122 : * entries for databases that were just dropped in the pgstat shutdown
1123 : * callback, which could confuse other code paths like the autovacuum
1124 : * scheduler.
1125 : */
1126 17962 : MyDatabaseId = dboid;
1127 :
1128 : /*
1129 : * Now we can mark our PGPROC entry with the database ID.
1130 : *
1131 : * We assume this is an atomic store so no lock is needed; though actually
1132 : * things would work fine even if it weren't atomic. Anyone searching the
1133 : * ProcArray for this database's ID should hold the database lock, so they
1134 : * would not be executing concurrently with this store. A process looking
1135 : * for another database's ID could in theory see a chance match if it read
1136 : * a partially-updated databaseId value; but as long as all such searches
1137 : * wait and retry, as in CountOtherDBBackends(), they will certainly see
1138 : * the correct value on their next try.
1139 : */
1140 17962 : MyProc->databaseId = MyDatabaseId;
1141 :
1142 : /*
1143 : * We established a catalog snapshot while reading pg_authid and/or
1144 : * pg_database; but until we have set up MyDatabaseId, we won't react to
1145 : * incoming sinval messages for unshared catalogs, so we won't realize it
1146 : * if the snapshot has been invalidated. Assume it's no good anymore.
1147 : */
1148 17962 : InvalidateCatalogSnapshot();
1149 :
1150 : /*
1151 : * Now we should be able to access the database directory safely. Verify
1152 : * it's there and looks reasonable.
1153 : */
1154 17962 : fullpath = GetDatabasePath(MyDatabaseId, MyDatabaseTableSpace);
1155 :
1156 17962 : if (!bootstrap)
1157 : {
1158 17911 : if (access(fullpath, F_OK) == -1)
1159 : {
1160 0 : if (errno == ENOENT)
1161 0 : ereport(FATAL,
1162 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1163 : errmsg("database \"%s\" does not exist",
1164 : dbname),
1165 : errdetail("The database subdirectory \"%s\" is missing.",
1166 : fullpath)));
1167 : else
1168 0 : ereport(FATAL,
1169 : (errcode_for_file_access(),
1170 : errmsg("could not access directory \"%s\": %m",
1171 : fullpath)));
1172 : }
1173 :
1174 17911 : ValidatePgVersion(fullpath);
1175 : }
1176 :
1177 17962 : SetDatabasePath(fullpath);
1178 17962 : pfree(fullpath);
1179 :
1180 : /*
1181 : * It's now possible to do real access to the system catalogs.
1182 : *
1183 : * Load relcache entries for the system catalogs. This must create at
1184 : * least the minimum set of "nailed-in" cache entries.
1185 : */
1186 17962 : RelationCacheInitializePhase3();
1187 :
1188 : /* set up ACL framework (so CheckMyDatabase can check permissions) */
1189 17961 : initialize_acl();
1190 :
1191 : /*
1192 : * Re-read the pg_database row for our database, check permissions and set
1193 : * up database-specific GUC settings. We can't do this until all the
1194 : * database-access infrastructure is up. (Also, it wants to know if the
1195 : * user is a superuser, so the above stuff has to happen first.)
1196 : */
1197 17961 : if (!bootstrap)
1198 17910 : CheckMyDatabase(dbname, am_superuser,
1199 17910 : (flags & INIT_PG_OVERRIDE_ALLOW_CONNS) != 0);
1200 :
1201 : /*
1202 : * Now process any command-line switches and any additional GUC variable
1203 : * settings passed in the startup packet. We couldn't do this before
1204 : * because we didn't know if client is a superuser.
1205 : */
1206 17958 : if (MyProcPort != NULL)
1207 13736 : process_startup_options(MyProcPort, am_superuser);
1208 :
1209 : /* Process pg_db_role_setting options */
1210 17958 : process_settings(MyDatabaseId, GetSessionUserId());
1211 :
1212 : /* Apply PostAuthDelay as soon as we've read all options */
1213 17958 : if (PostAuthDelay > 0)
1214 0 : pg_usleep(PostAuthDelay * 1000000L);
1215 :
1216 : /*
1217 : * Initialize various default states that can't be set up until we've
1218 : * selected the active user and gotten the right GUC settings.
1219 : */
1220 :
1221 : /* set default namespace search path */
1222 17958 : InitializeSearchPath();
1223 :
1224 : /* initialize client encoding */
1225 17958 : InitializeClientEncoding();
1226 :
1227 : /* Initialize this backend's session state. */
1228 17958 : InitializeSession();
1229 :
1230 : /*
1231 : * If this is an interactive session, load any libraries that should be
1232 : * preloaded at backend start. Since those are determined by GUCs, this
1233 : * can't happen until GUC settings are complete, but we want it to happen
1234 : * during the initial transaction in case anything that requires database
1235 : * access needs to be done.
1236 : */
1237 17958 : if ((flags & INIT_PG_LOAD_SESSION_LIBS) != 0)
1238 13026 : process_session_preload_libraries();
1239 :
1240 : /* fill in the remainder of this entry in the PgBackendStatus array */
1241 17958 : if (!bootstrap)
1242 17907 : pgstat_bestart_final();
1243 :
1244 : /* close the transaction we started above */
1245 17958 : if (!bootstrap)
1246 17907 : CommitTransactionCommand();
1247 :
1248 : /* send any WARNINGs we've accumulated during initialization */
1249 17958 : EmitConnectionWarnings();
1250 : }
1251 :
1252 : /*
1253 : * Process any command-line switches and any additional GUC variable
1254 : * settings passed in the startup packet.
1255 : */
1256 : static void
1257 14218 : process_startup_options(Port *port, bool am_superuser)
1258 : {
1259 : GucContext gucctx;
1260 : ListCell *gucopts;
1261 :
1262 14218 : gucctx = am_superuser ? PGC_SU_BACKEND : PGC_BACKEND;
1263 :
1264 : /*
1265 : * First process any command-line switches that were included in the
1266 : * startup packet, if we are in a regular backend.
1267 : */
1268 14218 : if (port->cmdline_options != NULL)
1269 : {
1270 : /*
1271 : * The maximum possible number of commandline arguments that could
1272 : * come from port->cmdline_options is (strlen + 1) / 2; see
1273 : * pg_split_opts().
1274 : */
1275 : char **av;
1276 : int maxac;
1277 : int ac;
1278 :
1279 4298 : maxac = 2 + (strlen(port->cmdline_options) + 1) / 2;
1280 :
1281 4298 : av = palloc_array(char *, maxac);
1282 4298 : ac = 0;
1283 :
1284 4298 : av[ac++] = "postgres";
1285 :
1286 4298 : pg_split_opts(av, &ac, port->cmdline_options);
1287 :
1288 4298 : av[ac] = NULL;
1289 :
1290 : Assert(ac < maxac);
1291 :
1292 4298 : (void) process_postgres_switches(ac, av, gucctx, NULL);
1293 : }
1294 :
1295 : /*
1296 : * Process any additional GUC variable settings passed in startup packet.
1297 : * These are handled exactly like command-line variables.
1298 : */
1299 14218 : gucopts = list_head(port->guc_options);
1300 34534 : while (gucopts)
1301 : {
1302 : char *name;
1303 : char *value;
1304 :
1305 20316 : name = lfirst(gucopts);
1306 20316 : gucopts = lnext(port->guc_options, gucopts);
1307 :
1308 20316 : value = lfirst(gucopts);
1309 20316 : gucopts = lnext(port->guc_options, gucopts);
1310 :
1311 20316 : SetConfigOption(name, value, gucctx, PGC_S_CLIENT);
1312 : }
1313 14218 : }
1314 :
1315 : /*
1316 : * Load GUC settings from pg_db_role_setting.
1317 : *
1318 : * We try specific settings for the database/role combination, as well as
1319 : * general for this database and for this user.
1320 : */
1321 : static void
1322 17958 : process_settings(Oid databaseid, Oid roleid)
1323 : {
1324 : Relation relsetting;
1325 : Snapshot snapshot;
1326 :
1327 17958 : if (!IsUnderPostmaster)
1328 119 : return;
1329 :
1330 17839 : relsetting = table_open(DbRoleSettingRelationId, AccessShareLock);
1331 :
1332 : /* read all the settings under the same snapshot for efficiency */
1333 17839 : snapshot = RegisterSnapshot(GetCatalogSnapshot(DbRoleSettingRelationId));
1334 :
1335 : /* Later settings are ignored if set earlier. */
1336 17839 : ApplySetting(snapshot, databaseid, roleid, relsetting, PGC_S_DATABASE_USER);
1337 17839 : ApplySetting(snapshot, InvalidOid, roleid, relsetting, PGC_S_USER);
1338 17839 : ApplySetting(snapshot, databaseid, InvalidOid, relsetting, PGC_S_DATABASE);
1339 17839 : ApplySetting(snapshot, InvalidOid, InvalidOid, relsetting, PGC_S_GLOBAL);
1340 :
1341 17839 : UnregisterSnapshot(snapshot);
1342 17839 : table_close(relsetting, AccessShareLock);
1343 : }
1344 :
1345 : /*
1346 : * Backend-shutdown callback. Do cleanup that we want to be sure happens
1347 : * before all the supporting modules begin to nail their doors shut via
1348 : * their own callbacks.
1349 : *
1350 : * User-level cleanup, such as temp-relation removal and UNLISTEN, happens
1351 : * via separate callbacks that execute before this one. We don't combine the
1352 : * callbacks because we still want this one to happen if the user-level
1353 : * cleanup fails.
1354 : */
1355 : static void
1356 19482 : ShutdownPostgres(int code, Datum arg)
1357 : {
1358 : /* Make sure we've killed any active transaction */
1359 19482 : AbortOutOfAnyTransaction();
1360 :
1361 : /*
1362 : * User locks are not released by transaction end, so be sure to release
1363 : * them explicitly.
1364 : */
1365 19482 : LockReleaseAll(USER_LOCKMETHOD, true);
1366 19482 : }
1367 :
1368 :
1369 : /*
1370 : * STATEMENT_TIMEOUT handler: trigger a query-cancel interrupt.
1371 : */
1372 : static void
1373 6 : StatementTimeoutHandler(void)
1374 : {
1375 6 : int sig = SIGINT;
1376 :
1377 : /*
1378 : * During authentication the timeout is used to deal with
1379 : * authentication_timeout - we want to quit in response to such timeouts.
1380 : */
1381 6 : if (ClientAuthInProgress)
1382 0 : sig = SIGTERM;
1383 :
1384 : #ifdef HAVE_SETSID
1385 : /* try to signal whole process group */
1386 6 : kill(-MyProcPid, sig);
1387 : #endif
1388 6 : kill(MyProcPid, sig);
1389 6 : }
1390 :
1391 : /*
1392 : * LOCK_TIMEOUT handler: trigger a query-cancel interrupt.
1393 : */
1394 : static void
1395 4 : LockTimeoutHandler(void)
1396 : {
1397 : #ifdef HAVE_SETSID
1398 : /* try to signal whole process group */
1399 4 : kill(-MyProcPid, SIGINT);
1400 : #endif
1401 4 : kill(MyProcPid, SIGINT);
1402 4 : }
1403 :
1404 : static void
1405 1 : TransactionTimeoutHandler(void)
1406 : {
1407 1 : TransactionTimeoutPending = true;
1408 1 : InterruptPending = true;
1409 1 : SetLatch(MyLatch);
1410 1 : }
1411 :
1412 : static void
1413 1 : IdleInTransactionSessionTimeoutHandler(void)
1414 : {
1415 1 : IdleInTransactionSessionTimeoutPending = true;
1416 1 : InterruptPending = true;
1417 1 : SetLatch(MyLatch);
1418 1 : }
1419 :
1420 : static void
1421 1 : IdleSessionTimeoutHandler(void)
1422 : {
1423 1 : IdleSessionTimeoutPending = true;
1424 1 : InterruptPending = true;
1425 1 : SetLatch(MyLatch);
1426 1 : }
1427 :
1428 : static void
1429 13 : IdleStatsUpdateTimeoutHandler(void)
1430 : {
1431 13 : IdleStatsUpdateTimeoutPending = true;
1432 13 : InterruptPending = true;
1433 13 : SetLatch(MyLatch);
1434 13 : }
1435 :
1436 : static void
1437 0 : ClientCheckTimeoutHandler(void)
1438 : {
1439 0 : CheckClientConnectionPending = true;
1440 0 : InterruptPending = true;
1441 0 : SetLatch(MyLatch);
1442 0 : }
1443 :
1444 : /*
1445 : * Returns true if at least one role is defined in this database cluster.
1446 : */
1447 : static bool
1448 70 : ThereIsAtLeastOneRole(void)
1449 : {
1450 : Relation pg_authid_rel;
1451 : TableScanDesc scan;
1452 : bool result;
1453 :
1454 70 : pg_authid_rel = table_open(AuthIdRelationId, AccessShareLock);
1455 :
1456 70 : scan = table_beginscan_catalog(pg_authid_rel, 0, NULL);
1457 70 : result = (heap_getnext(scan, ForwardScanDirection) != NULL);
1458 :
1459 70 : table_endscan(scan);
1460 70 : table_close(pg_authid_rel, AccessShareLock);
1461 :
1462 70 : return result;
1463 : }
1464 :
1465 : /*
1466 : * Stores a warning message to be sent later via EmitConnectionWarnings().
1467 : * Both msg and detail must be non-NULL.
1468 : *
1469 : * NB: Caller should ensure the strings are allocated in a long-lived context
1470 : * like TopMemoryContext.
1471 : */
1472 : void
1473 2 : StoreConnectionWarning(char *msg, char *detail)
1474 : {
1475 : MemoryContext oldcontext;
1476 :
1477 : Assert(msg);
1478 : Assert(detail);
1479 :
1480 2 : if (ConnectionWarningsEmitted)
1481 0 : elog(ERROR, "StoreConnectionWarning() called after EmitConnectionWarnings()");
1482 :
1483 2 : oldcontext = MemoryContextSwitchTo(TopMemoryContext);
1484 :
1485 2 : ConnectionWarningMessages = lappend(ConnectionWarningMessages, msg);
1486 2 : ConnectionWarningDetails = lappend(ConnectionWarningDetails, detail);
1487 :
1488 2 : MemoryContextSwitchTo(oldcontext);
1489 2 : }
1490 :
1491 : /*
1492 : * Sends the warning messages saved via StoreConnectionWarning() and frees the
1493 : * strings and lists.
1494 : *
1495 : * NB: This can only be called once per backend.
1496 : */
1497 : static void
1498 18440 : EmitConnectionWarnings(void)
1499 : {
1500 : ListCell *lc_msg;
1501 : ListCell *lc_detail;
1502 :
1503 18440 : if (ConnectionWarningsEmitted)
1504 0 : elog(ERROR, "EmitConnectionWarnings() called more than once");
1505 : else
1506 18440 : ConnectionWarningsEmitted = true;
1507 :
1508 18442 : forboth(lc_msg, ConnectionWarningMessages,
1509 : lc_detail, ConnectionWarningDetails)
1510 : {
1511 2 : ereport(WARNING,
1512 : (errmsg("%s", (char *) lfirst(lc_msg)),
1513 : errdetail("%s", (char *) lfirst(lc_detail))));
1514 : }
1515 :
1516 18440 : list_free_deep(ConnectionWarningMessages);
1517 18440 : list_free_deep(ConnectionWarningDetails);
1518 18440 : }
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