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 : typedef struct ConnectionWarning
78 : {
79 : char *message;
80 : char *detail;
81 : ConnectionWarningFilter filter;
82 : } ConnectionWarning;
83 :
84 : /* warnings to send via EmitConnectionWarnings() */
85 : static List *ConnectionWarnings;
86 :
87 : static HeapTuple GetDatabaseTuple(const char *dbname);
88 : static HeapTuple GetDatabaseTupleByOid(Oid dboid);
89 : static void PerformAuthentication(Port *port);
90 : static void CheckMyDatabase(const char *name, bool am_superuser, bool override_allow_connections);
91 : static void ShutdownPostgres(int code, Datum arg);
92 : static void StatementTimeoutHandler(void);
93 : static void LockTimeoutHandler(void);
94 : static void IdleInTransactionSessionTimeoutHandler(void);
95 : static void TransactionTimeoutHandler(void);
96 : static void IdleSessionTimeoutHandler(void);
97 : static void IdleStatsUpdateTimeoutHandler(void);
98 : static void ClientCheckTimeoutHandler(void);
99 : static bool ThereIsAtLeastOneRole(void);
100 : static void process_startup_options(Port *port, bool am_superuser);
101 : static void process_settings(Oid databaseid, Oid roleid);
102 : static void EmitConnectionWarnings(void);
103 :
104 :
105 : /*** InitPostgres support ***/
106 :
107 :
108 : /*
109 : * GetDatabaseTuple -- fetch the pg_database row for a database
110 : *
111 : * This is used during backend startup when we don't yet have any access to
112 : * system catalogs in general. In the worst case, we can seqscan pg_database
113 : * using nothing but the hard-wired descriptor that relcache.c creates for
114 : * pg_database. In more typical cases, relcache.c was able to load
115 : * descriptors for both pg_database and its indexes from the shared relcache
116 : * cache file, and so we can do an indexscan. criticalSharedRelcachesBuilt
117 : * tells whether we got the cached descriptors.
118 : */
119 : static HeapTuple
120 14445 : GetDatabaseTuple(const char *dbname)
121 : {
122 : HeapTuple tuple;
123 : Relation relation;
124 : SysScanDesc scan;
125 : ScanKeyData key[1];
126 :
127 : /*
128 : * form a scan key
129 : */
130 14445 : ScanKeyInit(&key[0],
131 : Anum_pg_database_datname,
132 : BTEqualStrategyNumber, F_NAMEEQ,
133 : CStringGetDatum(dbname));
134 :
135 : /*
136 : * Open pg_database and fetch a tuple. Force heap scan if we haven't yet
137 : * built the critical shared relcache entries (i.e., we're starting up
138 : * without a shared relcache cache file).
139 : */
140 14445 : relation = table_open(DatabaseRelationId, AccessShareLock);
141 14445 : scan = systable_beginscan(relation, DatabaseNameIndexId,
142 : criticalSharedRelcachesBuilt,
143 : NULL,
144 : 1, key);
145 :
146 14445 : tuple = systable_getnext(scan);
147 :
148 : /* Must copy tuple before releasing buffer */
149 14445 : if (HeapTupleIsValid(tuple))
150 14435 : tuple = heap_copytuple(tuple);
151 :
152 : /* all done */
153 14445 : systable_endscan(scan);
154 14445 : table_close(relation, AccessShareLock);
155 :
156 14445 : return tuple;
157 : }
158 :
159 : /*
160 : * GetDatabaseTupleByOid -- as above, but search by database OID
161 : */
162 : static HeapTuple
163 18708 : GetDatabaseTupleByOid(Oid dboid)
164 : {
165 : HeapTuple tuple;
166 : Relation relation;
167 : SysScanDesc scan;
168 : ScanKeyData key[1];
169 :
170 : /*
171 : * form a scan key
172 : */
173 18708 : ScanKeyInit(&key[0],
174 : Anum_pg_database_oid,
175 : BTEqualStrategyNumber, F_OIDEQ,
176 : ObjectIdGetDatum(dboid));
177 :
178 : /*
179 : * Open pg_database and fetch a tuple. Force heap scan if we haven't yet
180 : * built the critical shared relcache entries (i.e., we're starting up
181 : * without a shared relcache cache file).
182 : */
183 18708 : relation = table_open(DatabaseRelationId, AccessShareLock);
184 18708 : scan = systable_beginscan(relation, DatabaseOidIndexId,
185 : criticalSharedRelcachesBuilt,
186 : NULL,
187 : 1, key);
188 :
189 18708 : tuple = systable_getnext(scan);
190 :
191 : /* Must copy tuple before releasing buffer */
192 18708 : if (HeapTupleIsValid(tuple))
193 18708 : tuple = heap_copytuple(tuple);
194 :
195 : /* all done */
196 18708 : systable_endscan(scan);
197 18708 : table_close(relation, AccessShareLock);
198 :
199 18708 : return tuple;
200 : }
201 :
202 :
203 : /*
204 : * PerformAuthentication -- authenticate a remote client
205 : *
206 : * returns: nothing. Will not return at all if there's any failure.
207 : */
208 : static void
209 14951 : PerformAuthentication(Port *port)
210 : {
211 : /* This should be set already, but let's make sure */
212 14951 : ClientAuthInProgress = true; /* limit visibility of log messages */
213 :
214 : /*
215 : * In EXEC_BACKEND case, we didn't inherit the contents of pg_hba.conf
216 : * etcetera from the postmaster, and have to load them ourselves.
217 : *
218 : * FIXME: [fork/exec] Ugh. Is there a way around this overhead?
219 : */
220 : #ifdef EXEC_BACKEND
221 :
222 : /*
223 : * load_hba() and load_ident() want to work within the PostmasterContext,
224 : * so create that if it doesn't exist (which it won't). We'll delete it
225 : * again later, in PostgresMain.
226 : */
227 : if (PostmasterContext == NULL)
228 : PostmasterContext = AllocSetContextCreate(TopMemoryContext,
229 : "Postmaster",
230 : ALLOCSET_DEFAULT_SIZES);
231 :
232 : if (!load_hba())
233 : {
234 : /*
235 : * It makes no sense to continue if we fail to load the HBA file,
236 : * since there is no way to connect to the database in this case.
237 : */
238 : ereport(FATAL,
239 : /* translator: %s is a configuration file */
240 : (errmsg("could not load %s", HbaFileName)));
241 : }
242 :
243 : if (!load_ident())
244 : {
245 : /*
246 : * It is ok to continue if we fail to load the IDENT file, although it
247 : * means that you cannot log in using any of the authentication
248 : * methods that need a user name mapping. load_ident() already logged
249 : * the details of error to the log.
250 : */
251 : }
252 : #endif
253 :
254 : /* Capture authentication start time for logging */
255 14951 : conn_timing.auth_start = GetCurrentTimestamp();
256 :
257 : /*
258 : * Set up a timeout in case a buggy or malicious client fails to respond
259 : * during authentication. Since we're inside a transaction and might do
260 : * database access, we have to use the statement_timeout infrastructure.
261 : */
262 14951 : enable_timeout_after(STATEMENT_TIMEOUT, AuthenticationTimeout * 1000);
263 :
264 : /*
265 : * Now perform authentication exchange.
266 : */
267 14951 : set_ps_display("authentication");
268 14951 : ClientAuthentication(port); /* might not return, if failure */
269 :
270 : /*
271 : * Done with authentication. Disable the timeout, and log if needed.
272 : */
273 14877 : disable_timeout(STATEMENT_TIMEOUT, false);
274 :
275 : /* Capture authentication end time for logging */
276 14877 : conn_timing.auth_end = GetCurrentTimestamp();
277 :
278 14877 : if (log_connections & LOG_CONNECTION_AUTHORIZATION)
279 : {
280 : StringInfoData logmsg;
281 :
282 246 : initStringInfo(&logmsg);
283 246 : if (am_walsender)
284 0 : appendStringInfo(&logmsg, _("replication connection authorized: user=%s"),
285 : port->user_name);
286 : else
287 246 : appendStringInfo(&logmsg, _("connection authorized: user=%s"),
288 : port->user_name);
289 246 : if (!am_walsender)
290 246 : appendStringInfo(&logmsg, _(" database=%s"), port->database_name);
291 :
292 246 : if (port->application_name != NULL)
293 246 : appendStringInfo(&logmsg, _(" application_name=%s"),
294 : port->application_name);
295 :
296 : #ifdef USE_SSL
297 246 : if (port->ssl_in_use)
298 111 : appendStringInfo(&logmsg, _(" SSL enabled (protocol=%s, cipher=%s, bits=%d)"),
299 : be_tls_get_version(port),
300 : be_tls_get_cipher(port),
301 : be_tls_get_cipher_bits(port));
302 : #endif
303 : #ifdef ENABLE_GSS
304 : if (port->gss)
305 : {
306 : const char *princ = be_gssapi_get_princ(port);
307 :
308 : if (princ)
309 : appendStringInfo(&logmsg,
310 : _(" GSS (authenticated=%s, encrypted=%s, delegated_credentials=%s, principal=%s)"),
311 : be_gssapi_get_auth(port) ? _("yes") : _("no"),
312 : be_gssapi_get_enc(port) ? _("yes") : _("no"),
313 : be_gssapi_get_delegation(port) ? _("yes") : _("no"),
314 : princ);
315 : else
316 : appendStringInfo(&logmsg,
317 : _(" GSS (authenticated=%s, encrypted=%s, delegated_credentials=%s)"),
318 : be_gssapi_get_auth(port) ? _("yes") : _("no"),
319 : be_gssapi_get_enc(port) ? _("yes") : _("no"),
320 : be_gssapi_get_delegation(port) ? _("yes") : _("no"));
321 : }
322 : #endif
323 :
324 246 : ereport(LOG, errmsg_internal("%s", logmsg.data));
325 246 : pfree(logmsg.data);
326 : }
327 :
328 14877 : set_ps_display("startup");
329 :
330 14877 : ClientAuthInProgress = false; /* client_min_messages is active now */
331 14877 : }
332 :
333 :
334 : /*
335 : * CheckMyDatabase -- fetch information from the pg_database entry for our DB
336 : */
337 : static void
338 18700 : CheckMyDatabase(const char *name, bool am_superuser, bool override_allow_connections)
339 : {
340 : HeapTuple tup;
341 : Form_pg_database dbform;
342 : Datum datum;
343 : bool isnull;
344 : char *collate;
345 : char *ctype;
346 :
347 : /* Fetch our pg_database row normally, via syscache */
348 18700 : tup = SearchSysCache1(DATABASEOID, ObjectIdGetDatum(MyDatabaseId));
349 18700 : if (!HeapTupleIsValid(tup))
350 0 : elog(ERROR, "cache lookup failed for database %u", MyDatabaseId);
351 18700 : dbform = (Form_pg_database) GETSTRUCT(tup);
352 :
353 : /* This recheck is strictly paranoia */
354 18700 : if (strcmp(name, NameStr(dbform->datname)) != 0)
355 0 : ereport(FATAL,
356 : (errcode(ERRCODE_UNDEFINED_DATABASE),
357 : errmsg("database \"%s\" has disappeared from pg_database",
358 : name),
359 : errdetail("Database OID %u now seems to belong to \"%s\".",
360 : MyDatabaseId, NameStr(dbform->datname))));
361 :
362 : /*
363 : * Check permissions to connect to the database.
364 : *
365 : * These checks are not enforced when in standalone mode, so that there is
366 : * a way to recover from disabling all access to all databases, for
367 : * example "UPDATE pg_database SET datallowconn = false;".
368 : */
369 18700 : if (IsUnderPostmaster)
370 : {
371 : /*
372 : * Check that the database is currently allowing connections.
373 : * (Background processes can override this test and the next one by
374 : * setting override_allow_connections.)
375 : */
376 18624 : if (!dbform->datallowconn && !override_allow_connections)
377 1 : ereport(FATAL,
378 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
379 : errmsg("database \"%s\" is not currently accepting connections",
380 : name)));
381 :
382 : /*
383 : * Check privilege to connect to the database. (The am_superuser test
384 : * is redundant, but since we have the flag, might as well check it
385 : * and save a few cycles.)
386 : */
387 18952 : if (!am_superuser && !override_allow_connections &&
388 329 : object_aclcheck(DatabaseRelationId, MyDatabaseId, GetUserId(),
389 : ACL_CONNECT) != ACLCHECK_OK)
390 0 : ereport(FATAL,
391 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
392 : errmsg("permission denied for database \"%s\"", name),
393 : errdetail("User does not have CONNECT privilege.")));
394 :
395 : /*
396 : * Check connection limit for this database. We enforce the limit
397 : * only for regular backends, since other process types have their own
398 : * PGPROC pools.
399 : *
400 : * There is a race condition here --- we create our PGPROC before
401 : * checking for other PGPROCs. If two backends did this at about the
402 : * same time, they might both think they were over the limit, while
403 : * ideally one should succeed and one fail. Getting that to work
404 : * exactly seems more trouble than it is worth, however; instead we
405 : * just document that the connection limit is approximate.
406 : */
407 18623 : if (dbform->datconnlimit >= 0 &&
408 0 : AmRegularBackendProcess() &&
409 0 : !am_superuser &&
410 0 : CountDBConnections(MyDatabaseId) > dbform->datconnlimit)
411 0 : ereport(FATAL,
412 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
413 : errmsg("too many connections for database \"%s\"",
414 : name)));
415 : }
416 :
417 : /*
418 : * OK, we're golden. Next to-do item is to save the encoding info out of
419 : * the pg_database tuple.
420 : */
421 18699 : SetDatabaseEncoding(dbform->encoding);
422 : /* Record it as a GUC internal option, too */
423 18699 : SetConfigOption("server_encoding", GetDatabaseEncodingName(),
424 : PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
425 : /* If we have no other source of client_encoding, use server encoding */
426 18699 : SetConfigOption("client_encoding", GetDatabaseEncodingName(),
427 : PGC_BACKEND, PGC_S_DYNAMIC_DEFAULT);
428 :
429 : /* assign locale variables */
430 18699 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datcollate);
431 18699 : collate = TextDatumGetCString(datum);
432 18699 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datctype);
433 18699 : ctype = TextDatumGetCString(datum);
434 :
435 : /*
436 : * Historically, we set LC_COLLATE from datcollate, as well. That's no
437 : * longer necessary because all collation behavior is handled through
438 : * pg_locale_t.
439 : */
440 :
441 18699 : if (pg_perm_setlocale(LC_CTYPE, ctype) == NULL)
442 0 : ereport(FATAL,
443 : (errmsg("database locale is incompatible with operating system"),
444 : errdetail("The database was initialized with LC_CTYPE \"%s\", "
445 : " which is not recognized by setlocale().", ctype),
446 : errhint("Recreate the database with another locale or install the missing locale.")));
447 :
448 18699 : init_database_collation();
449 :
450 : /*
451 : * Check collation version. See similar code in
452 : * pg_newlocale_from_collation(). Note that here we warn instead of error
453 : * in any case, so that we don't prevent connecting.
454 : */
455 18697 : datum = SysCacheGetAttr(DATABASEOID, tup, Anum_pg_database_datcollversion,
456 : &isnull);
457 18697 : if (!isnull)
458 : {
459 : char *actual_versionstr;
460 : char *collversionstr;
461 : char *locale;
462 :
463 17851 : collversionstr = TextDatumGetCString(datum);
464 :
465 17851 : if (dbform->datlocprovider == COLLPROVIDER_LIBC)
466 16915 : locale = collate;
467 : else
468 : {
469 936 : datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datlocale);
470 936 : locale = TextDatumGetCString(datum);
471 : }
472 :
473 17851 : actual_versionstr = get_collation_actual_version(dbform->datlocprovider, locale);
474 17851 : if (!actual_versionstr)
475 : /* should not happen */
476 0 : elog(WARNING,
477 : "database \"%s\" has no actual collation version, but a version was recorded",
478 : name);
479 17851 : else if (strcmp(actual_versionstr, collversionstr) != 0)
480 0 : ereport(WARNING,
481 : (errmsg("database \"%s\" has a collation version mismatch",
482 : name),
483 : errdetail("The database was created using collation version %s, "
484 : "but the operating system provides version %s.",
485 : collversionstr, actual_versionstr),
486 : errhint("Rebuild all objects in this database that use the default collation and run "
487 : "ALTER DATABASE %s REFRESH COLLATION VERSION, "
488 : "or build PostgreSQL with the right library version.",
489 : quote_identifier(name))));
490 : }
491 :
492 18697 : ReleaseSysCache(tup);
493 18697 : }
494 :
495 :
496 : /*
497 : * pg_split_opts -- split a string of options and append it to an argv array
498 : *
499 : * The caller is responsible for ensuring the argv array is large enough. The
500 : * maximum possible number of arguments added by this routine is
501 : * (strlen(optstr) + 1) / 2.
502 : *
503 : * Because some option values can contain spaces we allow escaping using
504 : * backslashes, with \\ representing a literal backslash.
505 : */
506 : void
507 4386 : pg_split_opts(char **argv, int *argcp, const char *optstr)
508 : {
509 : StringInfoData s;
510 :
511 4386 : initStringInfo(&s);
512 :
513 16054 : while (*optstr)
514 : {
515 11668 : bool last_was_escape = false;
516 :
517 11668 : resetStringInfo(&s);
518 :
519 : /* skip over leading space */
520 22335 : while (isspace((unsigned char) *optstr))
521 10667 : optstr++;
522 :
523 11668 : if (*optstr == '\0')
524 0 : break;
525 :
526 : /*
527 : * Parse a single option, stopping at the first space, unless it's
528 : * escaped.
529 : */
530 178202 : while (*optstr)
531 : {
532 173816 : if (isspace((unsigned char) *optstr) && !last_was_escape)
533 7282 : break;
534 :
535 166534 : if (!last_was_escape && *optstr == '\\')
536 20 : last_was_escape = true;
537 : else
538 : {
539 166514 : last_was_escape = false;
540 166514 : appendStringInfoChar(&s, *optstr);
541 : }
542 :
543 166534 : optstr++;
544 : }
545 :
546 : /* now store the option in the next argv[] position */
547 11668 : argv[(*argcp)++] = pstrdup(s.data);
548 : }
549 :
550 4386 : pfree(s.data);
551 4386 : }
552 :
553 : /*
554 : * Initialize MaxBackends value from config options.
555 : *
556 : * This must be called after modules have had the chance to alter GUCs in
557 : * shared_preload_libraries and before shared memory size is determined.
558 : *
559 : * Note that in EXEC_BACKEND environment, the value is passed down from
560 : * postmaster to subprocesses via BackendParameters in SubPostmasterMain; only
561 : * postmaster itself and processes not under postmaster control should call
562 : * this.
563 : */
564 : void
565 1251 : InitializeMaxBackends(void)
566 : {
567 : Assert(MaxBackends == 0);
568 :
569 : /* Note that this does not include "auxiliary" processes */
570 1251 : MaxBackends = MaxConnections + autovacuum_worker_slots +
571 1251 : max_worker_processes + max_wal_senders + NUM_SPECIAL_WORKER_PROCS;
572 :
573 1251 : if (MaxBackends > MAX_BACKENDS)
574 0 : ereport(ERROR,
575 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
576 : errmsg("too many server processes configured"),
577 : errdetail("\"max_connections\" (%d) plus \"autovacuum_worker_slots\" (%d) plus \"max_worker_processes\" (%d) plus \"max_wal_senders\" (%d) must be less than %d.",
578 : MaxConnections, autovacuum_worker_slots,
579 : max_worker_processes, max_wal_senders,
580 : MAX_BACKENDS - (NUM_SPECIAL_WORKER_PROCS - 1))));
581 1251 : }
582 :
583 : /*
584 : * Initialize the number of fast-path lock slots in PGPROC.
585 : *
586 : * This must be called after modules have had the chance to alter GUCs in
587 : * shared_preload_libraries and before shared memory size is determined.
588 : */
589 : void
590 1251 : InitializeFastPathLocks(void)
591 : {
592 : /* Should be initialized only once. */
593 : Assert(FastPathLockGroupsPerBackend == 0);
594 :
595 : /*
596 : * Based on the max_locks_per_transaction GUC, as that's a good indicator
597 : * of the expected number of locks, figure out the value for
598 : * FastPathLockGroupsPerBackend. This must be a power-of-two. We cap the
599 : * value at FP_LOCK_GROUPS_PER_BACKEND_MAX and insist the value is at
600 : * least 1.
601 : *
602 : * The default max_locks_per_transaction = 128 means 8 groups by default.
603 : */
604 1251 : FastPathLockGroupsPerBackend =
605 1251 : Max(Min(pg_nextpower2_32(max_locks_per_xact) / FP_LOCK_SLOTS_PER_GROUP,
606 : FP_LOCK_GROUPS_PER_BACKEND_MAX), 1);
607 :
608 : /* Validate we did get a power-of-two */
609 : Assert(FastPathLockGroupsPerBackend ==
610 : pg_nextpower2_32(FastPathLockGroupsPerBackend));
611 1251 : }
612 :
613 : /*
614 : * Early initialization of a backend (either standalone or under postmaster).
615 : * This happens even before InitPostgres.
616 : *
617 : * This is separate from InitPostgres because it is also called by auxiliary
618 : * processes, such as the background writer process, which may not call
619 : * InitPostgres at all.
620 : */
621 : void
622 24857 : BaseInit(void)
623 : {
624 : Assert(MyProc != NULL);
625 :
626 : /*
627 : * Initialize our input/output/debugging file descriptors.
628 : */
629 24857 : DebugFileOpen();
630 :
631 : /*
632 : * Initialize file access. Done early so other subsystems can access
633 : * files.
634 : */
635 24857 : InitFileAccess();
636 :
637 : /*
638 : * Initialize statistics reporting. This needs to happen early to ensure
639 : * that pgstat's shutdown callback runs after the shutdown callbacks of
640 : * all subsystems that can produce stats (like e.g. transaction commits
641 : * can).
642 : */
643 24857 : pgstat_initialize();
644 :
645 : /*
646 : * Initialize AIO before infrastructure that might need to actually
647 : * execute AIO.
648 : */
649 24857 : pgaio_init_backend();
650 :
651 : /* Do local initialization of storage and buffer managers */
652 24857 : InitSync();
653 24857 : smgrinit();
654 24857 : InitBufferManagerAccess();
655 :
656 : /*
657 : * Initialize temporary file access after pgstat, so that the temporary
658 : * file shutdown hook can report temporary file statistics.
659 : */
660 24857 : InitTemporaryFileAccess();
661 :
662 : /*
663 : * Initialize local buffers for WAL record construction, in case we ever
664 : * try to insert XLOG.
665 : */
666 24857 : InitXLogInsert();
667 :
668 : /* Initialize lock manager's local structs */
669 24857 : InitLockManagerAccess();
670 :
671 : /*
672 : * Initialize replication slots after pgstat. The exit hook might need to
673 : * drop ephemeral slots, which in turn triggers stats reporting.
674 : */
675 24857 : ReplicationSlotInitialize();
676 24857 : }
677 :
678 :
679 : /* --------------------------------
680 : * InitPostgres
681 : * Initialize POSTGRES.
682 : *
683 : * Parameters:
684 : * in_dbname, dboid: specify database to connect to, as described below
685 : * username, useroid: specify role to connect as, as described below
686 : * flags:
687 : * - INIT_PG_LOAD_SESSION_LIBS to honor [session|local]_preload_libraries.
688 : * - INIT_PG_OVERRIDE_ALLOW_CONNS to connect despite !datallowconn.
689 : * - INIT_PG_OVERRIDE_ROLE_LOGIN to connect despite !rolcanlogin.
690 : * out_dbname: optional output parameter, see below; pass NULL if not used
691 : *
692 : * The database can be specified by name, using the in_dbname parameter, or by
693 : * OID, using the dboid parameter. Specify NULL or InvalidOid respectively
694 : * for the unused parameter. If dboid is provided, the actual database
695 : * name can be returned to the caller in out_dbname. If out_dbname isn't
696 : * NULL, it must point to a buffer of size NAMEDATALEN.
697 : *
698 : * Similarly, the role can be passed by name, using the username parameter,
699 : * or by OID using the useroid parameter.
700 : *
701 : * In bootstrap mode the database and username parameters are NULL/InvalidOid.
702 : * The autovacuum launcher process doesn't specify these parameters either,
703 : * because it only goes far enough to be able to read pg_database; it doesn't
704 : * connect to any particular database. An autovacuum worker specifies a
705 : * database but not a username; conversely, a physical walsender specifies
706 : * username but not database.
707 : *
708 : * By convention, INIT_PG_LOAD_SESSION_LIBS should be passed in "flags" in
709 : * "interactive" sessions (including standalone backends), but not in
710 : * background processes such as autovacuum. Note in particular that it
711 : * shouldn't be true in parallel worker processes; those have another
712 : * mechanism for replicating their leader's set of loaded libraries.
713 : *
714 : * We expect that InitProcess() was already called, so we already have a
715 : * PGPROC struct ... but it's not completely filled in yet.
716 : *
717 : * Note:
718 : * Be very careful with the order of calls in the InitPostgres function.
719 : * --------------------------------
720 : */
721 : void
722 20390 : InitPostgres(const char *in_dbname, Oid dboid,
723 : const char *username, Oid useroid,
724 : uint32 flags,
725 : char *out_dbname)
726 : {
727 20390 : bool bootstrap = IsBootstrapProcessingMode();
728 : bool am_superuser;
729 : char *fullpath;
730 : char dbname[NAMEDATALEN];
731 20390 : int nfree = 0;
732 :
733 20390 : elog(DEBUG3, "InitPostgres");
734 :
735 : /*
736 : * Add my PGPROC struct to the ProcArray.
737 : *
738 : * Once I have done this, I am visible to other backends!
739 : */
740 20390 : InitProcessPhase2();
741 :
742 : /* Initialize status reporting */
743 20390 : pgstat_beinit();
744 :
745 : /*
746 : * And initialize an entry in the PgBackendStatus array. That way, if
747 : * LWLocks or third-party authentication should happen to hang, it is
748 : * possible to retrieve some information about what is going on.
749 : */
750 20390 : if (!bootstrap)
751 : {
752 20333 : pgstat_bestart_initial();
753 20333 : INJECTION_POINT("init-pre-auth", NULL);
754 : }
755 :
756 : /*
757 : * Initialize my entry in the shared-invalidation manager's array of
758 : * per-backend data.
759 : */
760 20390 : SharedInvalBackendInit(false);
761 :
762 : /*
763 : * Prevent consuming interrupts between setting ProcSignalInit and setting
764 : * the initial local data checksum value. If a barrier is emitted, and
765 : * absorbed, before local cached state is initialized the state transition
766 : * can be invalid.
767 : */
768 20390 : HOLD_INTERRUPTS();
769 :
770 20390 : ProcSignalInit(MyCancelKey, MyCancelKeyLength);
771 :
772 : /*
773 : * Initialize a local cache of the data_checksum_version, to be updated by
774 : * the procsignal-based barriers.
775 : *
776 : * This intentionally happens after initializing the procsignal, otherwise
777 : * we might miss a state change. This means we can get a barrier for the
778 : * state we've just initialized.
779 : *
780 : * The postmaster (which is what gets forked into the new child process)
781 : * does not handle barriers, therefore it may not have the current value
782 : * of LocalDataChecksumState value (it'll have the value read from the
783 : * control file, which may be arbitrarily old).
784 : *
785 : * NB: Even if the postmaster handled barriers, the value might still be
786 : * stale, as it might have changed after this process forked.
787 : */
788 20390 : InitLocalDataChecksumState();
789 :
790 20390 : RESUME_INTERRUPTS();
791 :
792 : /*
793 : * Also set up timeout handlers needed for backend operation. We need
794 : * these in every case except bootstrap.
795 : */
796 20390 : if (!bootstrap)
797 : {
798 20333 : RegisterTimeout(DEADLOCK_TIMEOUT, CheckDeadLockAlert);
799 20333 : RegisterTimeout(STATEMENT_TIMEOUT, StatementTimeoutHandler);
800 20333 : RegisterTimeout(LOCK_TIMEOUT, LockTimeoutHandler);
801 20333 : RegisterTimeout(IDLE_IN_TRANSACTION_SESSION_TIMEOUT,
802 : IdleInTransactionSessionTimeoutHandler);
803 20333 : RegisterTimeout(TRANSACTION_TIMEOUT, TransactionTimeoutHandler);
804 20333 : RegisterTimeout(IDLE_SESSION_TIMEOUT, IdleSessionTimeoutHandler);
805 20333 : RegisterTimeout(CLIENT_CONNECTION_CHECK_TIMEOUT, ClientCheckTimeoutHandler);
806 20333 : RegisterTimeout(IDLE_STATS_UPDATE_TIMEOUT,
807 : IdleStatsUpdateTimeoutHandler);
808 : }
809 :
810 : /*
811 : * If this is either a bootstrap process or a standalone backend, start up
812 : * the XLOG machinery, and register to have it closed down at exit. In
813 : * other cases, the startup process is responsible for starting up the
814 : * XLOG machinery, and the checkpointer for closing it down.
815 : */
816 20390 : if (!IsUnderPostmaster)
817 : {
818 : /*
819 : * We don't yet have an aux-process resource owner, but StartupXLOG
820 : * and ShutdownXLOG will need one. Hence, create said resource owner
821 : * (and register a callback to clean it up after ShutdownXLOG runs).
822 : */
823 133 : CreateAuxProcessResourceOwner();
824 :
825 133 : StartupXLOG();
826 : /* Release (and warn about) any buffer pins leaked in StartupXLOG */
827 133 : ReleaseAuxProcessResources(true);
828 : /* Reset CurrentResourceOwner to nothing for the moment */
829 133 : CurrentResourceOwner = NULL;
830 :
831 : /*
832 : * Use before_shmem_exit() so that ShutdownXLOG() can rely on DSM
833 : * segments etc to work (which in turn is required for pgstats).
834 : */
835 133 : before_shmem_exit(pgstat_before_server_shutdown, 0);
836 133 : before_shmem_exit(ShutdownXLOG, 0);
837 : }
838 :
839 : /*
840 : * Initialize the process-local logical info WAL logging state.
841 : *
842 : * This must be called after ProcSignalInit() so that the process can
843 : * participate in procsignal-based barriers that update this state.
844 : * Furthermore, in !IsUnderPostmaster cases, this must occur after
845 : * StartupXLOG() where the shared state is first established.
846 : */
847 20390 : InitializeProcessXLogLogicalInfo();
848 :
849 : /*
850 : * Initialize the relation cache and the system catalog caches. Note that
851 : * no catalog access happens here; we only set up the hashtable structure.
852 : * We must do this before starting a transaction because transaction abort
853 : * would try to touch these hashtables.
854 : */
855 20390 : RelationCacheInitialize();
856 20390 : InitCatalogCache();
857 20390 : InitPlanCache();
858 :
859 : /* Initialize portal manager */
860 20390 : EnablePortalManager();
861 :
862 : /*
863 : * Load relcache entries for the shared system catalogs. This must create
864 : * at least entries for pg_database and catalogs used for authentication.
865 : */
866 20390 : RelationCacheInitializePhase2();
867 :
868 : /*
869 : * Set up process-exit callback to do pre-shutdown cleanup. This is one
870 : * of the first before_shmem_exit callbacks we register; thus, this will
871 : * be one of the last things we do before low-level modules like the
872 : * buffer manager begin to close down. We need to have this in place
873 : * before we begin our first transaction --- if we fail during the
874 : * initialization transaction, as is entirely possible, we need the
875 : * AbortTransaction call to clean up.
876 : */
877 20390 : before_shmem_exit(ShutdownPostgres, 0);
878 :
879 : /* The autovacuum launcher is done here */
880 20390 : if (AmAutoVacuumLauncherProcess())
881 : {
882 : /* fill in the remainder of this entry in the PgBackendStatus array */
883 488 : pgstat_bestart_final();
884 :
885 1534 : return;
886 : }
887 :
888 : /*
889 : * Start a new transaction here before first access to db.
890 : */
891 19902 : if (!bootstrap)
892 : {
893 : /* statement_timestamp must be set for timeouts to work correctly */
894 19845 : SetCurrentStatementStartTimestamp();
895 19845 : StartTransactionCommand();
896 :
897 : /*
898 : * transaction_isolation will have been set to the default by the
899 : * above. If the default is "serializable", and we are in hot
900 : * standby, we will fail if we don't change it to something lower.
901 : * Fortunately, "read committed" is plenty good enough.
902 : */
903 19845 : XactIsoLevel = XACT_READ_COMMITTED;
904 : }
905 :
906 : /*
907 : * Perform client authentication if necessary, then figure out our
908 : * postgres user ID, and see if we are a superuser.
909 : *
910 : * In standalone mode, autovacuum worker processes and slot sync worker
911 : * process, we use a fixed ID, otherwise we figure it out from the
912 : * authenticated user name.
913 : */
914 19902 : if (bootstrap || AmAutoVacuumWorkerProcess() || AmLogicalSlotSyncWorkerProcess())
915 : {
916 1652 : InitializeSessionUserIdStandalone();
917 1652 : am_superuser = true;
918 : }
919 18250 : else if (!IsUnderPostmaster)
920 : {
921 76 : InitializeSessionUserIdStandalone();
922 76 : am_superuser = true;
923 76 : if (!ThereIsAtLeastOneRole())
924 0 : ereport(WARNING,
925 : (errcode(ERRCODE_UNDEFINED_OBJECT),
926 : errmsg("no roles are defined in this database system"),
927 : errhint("You should immediately run CREATE USER \"%s\" SUPERUSER;.",
928 : username != NULL ? username : "postgres")));
929 : }
930 18174 : else if (AmBackgroundWorkerProcess() || AmDataChecksumsWorkerProcess())
931 : {
932 3223 : if (username == NULL && !OidIsValid(useroid))
933 : {
934 568 : InitializeSessionUserIdStandalone();
935 568 : am_superuser = true;
936 : }
937 : else
938 : {
939 2655 : InitializeSessionUserId(username, useroid,
940 2655 : (flags & INIT_PG_OVERRIDE_ROLE_LOGIN) != 0);
941 2654 : am_superuser = superuser();
942 : }
943 : }
944 : else
945 : {
946 : /* normal multiuser case */
947 : Assert(MyProcPort != NULL);
948 14951 : PerformAuthentication(MyProcPort);
949 14877 : InitializeSessionUserId(username, useroid, false);
950 : /* ensure that auth_method is actually valid, aka authn_id is not NULL */
951 14873 : if (MyClientConnectionInfo.authn_id)
952 136 : InitializeSystemUser(MyClientConnectionInfo.authn_id,
953 : hba_authname(MyClientConnectionInfo.auth_method));
954 14873 : am_superuser = superuser();
955 : }
956 :
957 : /* Report any SSL/GSS details for the session. */
958 19823 : if (MyProcPort != NULL)
959 : {
960 : Assert(!bootstrap);
961 :
962 14873 : pgstat_bestart_security();
963 : }
964 :
965 : /*
966 : * Binary upgrades only allowed super-user connections
967 : */
968 19823 : if (IsBinaryUpgrade && !am_superuser)
969 : {
970 0 : ereport(FATAL,
971 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
972 : errmsg("must be superuser to connect in binary upgrade mode")));
973 : }
974 :
975 : /*
976 : * The last few regular connection slots are reserved for superusers and
977 : * roles with privileges of pg_use_reserved_connections. We do not apply
978 : * these limits to background processes, since they all have their own
979 : * pools of PGPROC slots.
980 : *
981 : * Note: At this point, the new backend has already claimed a proc struct,
982 : * so we must check whether the number of free slots is strictly less than
983 : * the reserved connection limits.
984 : */
985 19823 : if (AmRegularBackendProcess() && !am_superuser &&
986 283 : (SuperuserReservedConnections + ReservedConnections) > 0 &&
987 283 : !HaveNFreeProcs(SuperuserReservedConnections + ReservedConnections, &nfree))
988 : {
989 4 : if (nfree < SuperuserReservedConnections)
990 1 : ereport(FATAL,
991 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
992 : errmsg("remaining connection slots are reserved for roles with the %s attribute",
993 : "SUPERUSER")));
994 :
995 3 : if (!has_privs_of_role(GetUserId(), ROLE_PG_USE_RESERVED_CONNECTIONS))
996 1 : ereport(FATAL,
997 : (errcode(ERRCODE_TOO_MANY_CONNECTIONS),
998 : errmsg("remaining connection slots are reserved for roles with privileges of the \"%s\" role",
999 : "pg_use_reserved_connections")));
1000 : }
1001 :
1002 : /* Check replication permissions needed for walsender processes. */
1003 19821 : if (am_walsender)
1004 : {
1005 : Assert(!bootstrap);
1006 :
1007 1314 : if (!has_rolreplication(GetUserId()))
1008 0 : ereport(FATAL,
1009 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
1010 : errmsg("permission denied to start WAL sender"),
1011 : errdetail("Only roles with the %s attribute may start a WAL sender process.",
1012 : "REPLICATION")));
1013 : }
1014 :
1015 : /*
1016 : * If this is a plain walsender only supporting physical replication, we
1017 : * don't want to connect to any particular database. Just finish the
1018 : * backend startup by processing any options from the startup packet, and
1019 : * we're done.
1020 : */
1021 19821 : if (am_walsender && !am_db_walsender)
1022 : {
1023 : /* process any options passed in the startup packet */
1024 508 : if (MyProcPort != NULL)
1025 508 : process_startup_options(MyProcPort, am_superuser);
1026 :
1027 : /* Apply PostAuthDelay as soon as we've read all options */
1028 508 : if (PostAuthDelay > 0)
1029 0 : pg_usleep(PostAuthDelay * 1000000L);
1030 :
1031 : /* initialize client encoding */
1032 508 : InitializeClientEncoding();
1033 :
1034 : /* fill in the remainder of this entry in the PgBackendStatus array */
1035 508 : pgstat_bestart_final();
1036 :
1037 : /* close the transaction we started above */
1038 508 : CommitTransactionCommand();
1039 :
1040 : /* send any WARNINGs we've accumulated during initialization */
1041 508 : EmitConnectionWarnings();
1042 :
1043 508 : return;
1044 : }
1045 :
1046 : /*
1047 : * Set up the global variables holding database id and default tablespace.
1048 : * But note we won't actually try to touch the database just yet.
1049 : *
1050 : * We take a shortcut in the bootstrap case, otherwise we have to look up
1051 : * the db's entry in pg_database.
1052 : */
1053 19313 : if (bootstrap)
1054 : {
1055 57 : dboid = Template1DbOid;
1056 57 : MyDatabaseTableSpace = DEFAULTTABLESPACE_OID;
1057 : }
1058 19256 : else if (in_dbname != NULL)
1059 : {
1060 : HeapTuple tuple;
1061 : Form_pg_database dbform;
1062 :
1063 14445 : tuple = GetDatabaseTuple(in_dbname);
1064 14445 : if (!HeapTupleIsValid(tuple))
1065 10 : ereport(FATAL,
1066 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1067 : errmsg("database \"%s\" does not exist", in_dbname)));
1068 14435 : dbform = (Form_pg_database) GETSTRUCT(tuple);
1069 14435 : dboid = dbform->oid;
1070 : }
1071 4811 : else if (!OidIsValid(dboid))
1072 : {
1073 : /*
1074 : * If this is a background worker not bound to any particular
1075 : * database, we're done now. Everything that follows only makes sense
1076 : * if we are bound to a specific database. We do need to close the
1077 : * transaction we started before returning.
1078 : */
1079 538 : if (!bootstrap)
1080 : {
1081 538 : pgstat_bestart_final();
1082 538 : CommitTransactionCommand();
1083 : }
1084 538 : return;
1085 : }
1086 :
1087 : /*
1088 : * Now, take a writer's lock on the database we are trying to connect to.
1089 : * If there is a concurrently running DROP DATABASE on that database, this
1090 : * will block us until it finishes (and has committed its update of
1091 : * pg_database).
1092 : *
1093 : * Note that the lock is not held long, only until the end of this startup
1094 : * transaction. This is OK since we will advertise our use of the
1095 : * database in the ProcArray before dropping the lock (in fact, that's the
1096 : * next thing to do). Anyone trying a DROP DATABASE after this point will
1097 : * see us in the array once they have the lock. Ordering is important for
1098 : * this because we don't want to advertise ourselves as being in this
1099 : * database until we have the lock; otherwise we create what amounts to a
1100 : * deadlock with CountOtherDBBackends().
1101 : *
1102 : * Note: use of RowExclusiveLock here is reasonable because we envision
1103 : * our session as being a concurrent writer of the database. If we had a
1104 : * way of declaring a session as being guaranteed-read-only, we could use
1105 : * AccessShareLock for such sessions and thereby not conflict against
1106 : * CREATE DATABASE.
1107 : */
1108 18765 : if (!bootstrap)
1109 18708 : LockSharedObject(DatabaseRelationId, dboid, 0, RowExclusiveLock);
1110 :
1111 : /*
1112 : * Recheck pg_database to make sure the target database hasn't gone away.
1113 : * If there was a concurrent DROP DATABASE, this ensures we will die
1114 : * cleanly without creating a mess.
1115 : */
1116 18765 : if (!bootstrap)
1117 : {
1118 : HeapTuple tuple;
1119 : Form_pg_database datform;
1120 :
1121 18708 : tuple = GetDatabaseTupleByOid(dboid);
1122 18708 : if (HeapTupleIsValid(tuple))
1123 18708 : datform = (Form_pg_database) GETSTRUCT(tuple);
1124 :
1125 18708 : if (!HeapTupleIsValid(tuple) ||
1126 14435 : (in_dbname && namestrcmp(&datform->datname, in_dbname)))
1127 : {
1128 0 : if (in_dbname)
1129 0 : ereport(FATAL,
1130 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1131 : errmsg("database \"%s\" does not exist", in_dbname),
1132 : errdetail("It seems to have just been dropped or renamed.")));
1133 : else
1134 0 : ereport(FATAL,
1135 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1136 : errmsg("database %u does not exist", dboid)));
1137 : }
1138 :
1139 18708 : strlcpy(dbname, NameStr(datform->datname), sizeof(dbname));
1140 :
1141 18708 : if (database_is_invalid_form(datform))
1142 : {
1143 6 : ereport(FATAL,
1144 : errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1145 : errmsg("cannot connect to invalid database \"%s\"", dbname),
1146 : errhint("Use DROP DATABASE to drop invalid databases."));
1147 : }
1148 :
1149 18702 : MyDatabaseTableSpace = datform->dattablespace;
1150 18702 : MyDatabaseHasLoginEventTriggers = datform->dathasloginevt;
1151 : /* pass the database name back to the caller */
1152 18702 : if (out_dbname)
1153 1589 : strcpy(out_dbname, dbname);
1154 : }
1155 :
1156 : /*
1157 : * Now that we rechecked, we are certain to be connected to a database and
1158 : * thus can set MyDatabaseId.
1159 : *
1160 : * It is important that MyDatabaseId only be set once we are sure that the
1161 : * target database can no longer be concurrently dropped or renamed. For
1162 : * example, without this guarantee, pgstat_update_dbstats() could create
1163 : * entries for databases that were just dropped in the pgstat shutdown
1164 : * callback, which could confuse other code paths like the autovacuum
1165 : * scheduler.
1166 : */
1167 18759 : MyDatabaseId = dboid;
1168 :
1169 : /*
1170 : * Now we can mark our PGPROC entry with the database ID.
1171 : *
1172 : * We assume this is an atomic store so no lock is needed; though actually
1173 : * things would work fine even if it weren't atomic. Anyone searching the
1174 : * ProcArray for this database's ID should hold the database lock, so they
1175 : * would not be executing concurrently with this store. A process looking
1176 : * for another database's ID could in theory see a chance match if it read
1177 : * a partially-updated databaseId value; but as long as all such searches
1178 : * wait and retry, as in CountOtherDBBackends(), they will certainly see
1179 : * the correct value on their next try.
1180 : */
1181 18759 : MyProc->databaseId = MyDatabaseId;
1182 :
1183 : /*
1184 : * We established a catalog snapshot while reading pg_authid and/or
1185 : * pg_database; but until we have set up MyDatabaseId, we won't react to
1186 : * incoming sinval messages for unshared catalogs, so we won't realize it
1187 : * if the snapshot has been invalidated. Assume it's no good anymore.
1188 : */
1189 18759 : InvalidateCatalogSnapshot();
1190 :
1191 : /*
1192 : * Now we should be able to access the database directory safely. Verify
1193 : * it's there and looks reasonable.
1194 : */
1195 18759 : fullpath = GetDatabasePath(MyDatabaseId, MyDatabaseTableSpace);
1196 :
1197 18759 : if (!bootstrap)
1198 : {
1199 18702 : if (access(fullpath, F_OK) == -1)
1200 : {
1201 0 : if (errno == ENOENT)
1202 0 : ereport(FATAL,
1203 : (errcode(ERRCODE_UNDEFINED_DATABASE),
1204 : errmsg("database \"%s\" does not exist",
1205 : dbname),
1206 : errdetail("The database subdirectory \"%s\" is missing.",
1207 : fullpath)));
1208 : else
1209 0 : ereport(FATAL,
1210 : (errcode_for_file_access(),
1211 : errmsg("could not access directory \"%s\": %m",
1212 : fullpath)));
1213 : }
1214 :
1215 18702 : ValidatePgVersion(fullpath);
1216 : }
1217 :
1218 18759 : SetDatabasePath(fullpath);
1219 18759 : pfree(fullpath);
1220 :
1221 : /*
1222 : * It's now possible to do real access to the system catalogs.
1223 : *
1224 : * Load relcache entries for the system catalogs. This must create at
1225 : * least the minimum set of "nailed-in" cache entries.
1226 : */
1227 18759 : RelationCacheInitializePhase3();
1228 :
1229 : /* set up ACL framework (so CheckMyDatabase can check permissions) */
1230 18757 : initialize_acl();
1231 :
1232 : /*
1233 : * Re-read the pg_database row for our database, check permissions and set
1234 : * up database-specific GUC settings. We can't do this until all the
1235 : * database-access infrastructure is up. (Also, it wants to know if the
1236 : * user is a superuser, so the above stuff has to happen first.)
1237 : */
1238 18757 : if (!bootstrap)
1239 18700 : CheckMyDatabase(dbname, am_superuser,
1240 18700 : (flags & INIT_PG_OVERRIDE_ALLOW_CONNS) != 0);
1241 :
1242 : /*
1243 : * Now process any command-line switches and any additional GUC variable
1244 : * settings passed in the startup packet. We couldn't do this before
1245 : * because we didn't know if client is a superuser.
1246 : */
1247 18754 : if (MyProcPort != NULL)
1248 14347 : process_startup_options(MyProcPort, am_superuser);
1249 :
1250 : /* Process pg_db_role_setting options */
1251 18754 : process_settings(MyDatabaseId, GetSessionUserId());
1252 :
1253 : /* Apply PostAuthDelay as soon as we've read all options */
1254 18754 : if (PostAuthDelay > 0)
1255 0 : pg_usleep(PostAuthDelay * 1000000L);
1256 :
1257 : /*
1258 : * Initialize various default states that can't be set up until we've
1259 : * selected the active user and gotten the right GUC settings.
1260 : */
1261 :
1262 : /* set default namespace search path */
1263 18754 : InitializeSearchPath();
1264 :
1265 : /* initialize client encoding */
1266 18754 : InitializeClientEncoding();
1267 :
1268 : /* Initialize this backend's session state. */
1269 18754 : InitializeSession();
1270 :
1271 : /*
1272 : * If this is an interactive session, load any libraries that should be
1273 : * preloaded at backend start. Since those are determined by GUCs, this
1274 : * can't happen until GUC settings are complete, but we want it to happen
1275 : * during the initial transaction in case anything that requires database
1276 : * access needs to be done.
1277 : */
1278 18754 : if ((flags & INIT_PG_LOAD_SESSION_LIBS) != 0)
1279 13615 : process_session_preload_libraries();
1280 :
1281 : /* fill in the remainder of this entry in the PgBackendStatus array */
1282 18754 : if (!bootstrap)
1283 18697 : pgstat_bestart_final();
1284 :
1285 : /* close the transaction we started above */
1286 18754 : if (!bootstrap)
1287 18697 : CommitTransactionCommand();
1288 :
1289 : /* send any WARNINGs we've accumulated during initialization */
1290 18754 : EmitConnectionWarnings();
1291 : }
1292 :
1293 : /*
1294 : * Process any command-line switches and any additional GUC variable
1295 : * settings passed in the startup packet.
1296 : */
1297 : static void
1298 14855 : process_startup_options(Port *port, bool am_superuser)
1299 : {
1300 : GucContext gucctx;
1301 : ListCell *gucopts;
1302 :
1303 14855 : gucctx = am_superuser ? PGC_SU_BACKEND : PGC_BACKEND;
1304 :
1305 : /*
1306 : * First process any command-line switches that were included in the
1307 : * startup packet, if we are in a regular backend.
1308 : */
1309 14855 : if (port->cmdline_options != NULL)
1310 : {
1311 : /*
1312 : * The maximum possible number of commandline arguments that could
1313 : * come from port->cmdline_options is (strlen + 1) / 2; see
1314 : * pg_split_opts().
1315 : */
1316 : char **av;
1317 : int maxac;
1318 : int ac;
1319 :
1320 4386 : maxac = 2 + (strlen(port->cmdline_options) + 1) / 2;
1321 :
1322 4386 : av = palloc_array(char *, maxac);
1323 4386 : ac = 0;
1324 :
1325 4386 : av[ac++] = "postgres";
1326 :
1327 4386 : pg_split_opts(av, &ac, port->cmdline_options);
1328 :
1329 4386 : av[ac] = NULL;
1330 :
1331 : Assert(ac < maxac);
1332 :
1333 4386 : (void) process_postgres_switches(ac, av, gucctx, NULL);
1334 : }
1335 :
1336 : /*
1337 : * Process any additional GUC variable settings passed in startup packet.
1338 : * These are handled exactly like command-line variables.
1339 : */
1340 14855 : gucopts = list_head(port->guc_options);
1341 35926 : while (gucopts)
1342 : {
1343 : char *name;
1344 : char *value;
1345 :
1346 21071 : name = lfirst(gucopts);
1347 21071 : gucopts = lnext(port->guc_options, gucopts);
1348 :
1349 21071 : value = lfirst(gucopts);
1350 21071 : gucopts = lnext(port->guc_options, gucopts);
1351 :
1352 21071 : SetConfigOption(name, value, gucctx, PGC_S_CLIENT);
1353 : }
1354 14855 : }
1355 :
1356 : /*
1357 : * Load GUC settings from pg_db_role_setting.
1358 : *
1359 : * We try specific settings for the database/role combination, as well as
1360 : * general for this database and for this user.
1361 : */
1362 : static void
1363 18754 : process_settings(Oid databaseid, Oid roleid)
1364 : {
1365 : Relation relsetting;
1366 : Snapshot snapshot;
1367 :
1368 18754 : if (!IsUnderPostmaster)
1369 131 : return;
1370 :
1371 18623 : relsetting = table_open(DbRoleSettingRelationId, AccessShareLock);
1372 :
1373 : /* read all the settings under the same snapshot for efficiency */
1374 18623 : snapshot = RegisterSnapshot(GetCatalogSnapshot(DbRoleSettingRelationId));
1375 :
1376 : /* Later settings are ignored if set earlier. */
1377 18623 : ApplySetting(snapshot, databaseid, roleid, relsetting, PGC_S_DATABASE_USER);
1378 18623 : ApplySetting(snapshot, InvalidOid, roleid, relsetting, PGC_S_USER);
1379 18623 : ApplySetting(snapshot, databaseid, InvalidOid, relsetting, PGC_S_DATABASE);
1380 18623 : ApplySetting(snapshot, InvalidOid, InvalidOid, relsetting, PGC_S_GLOBAL);
1381 :
1382 18623 : UnregisterSnapshot(snapshot);
1383 18623 : table_close(relsetting, AccessShareLock);
1384 : }
1385 :
1386 : /*
1387 : * Backend-shutdown callback. Do cleanup that we want to be sure happens
1388 : * before all the supporting modules begin to nail their doors shut via
1389 : * their own callbacks.
1390 : *
1391 : * User-level cleanup, such as temp-relation removal and UNLISTEN, happens
1392 : * via separate callbacks that execute before this one. We don't combine the
1393 : * callbacks because we still want this one to happen if the user-level
1394 : * cleanup fails.
1395 : */
1396 : static void
1397 20390 : ShutdownPostgres(int code, Datum arg)
1398 : {
1399 : /* Make sure we've killed any active transaction */
1400 20390 : AbortOutOfAnyTransaction();
1401 :
1402 : /*
1403 : * User locks are not released by transaction end, so be sure to release
1404 : * them explicitly.
1405 : */
1406 20390 : LockReleaseAll(USER_LOCKMETHOD, true);
1407 20390 : }
1408 :
1409 :
1410 : /*
1411 : * STATEMENT_TIMEOUT handler: trigger a query-cancel interrupt.
1412 : */
1413 : static void
1414 6 : StatementTimeoutHandler(void)
1415 : {
1416 6 : int sig = SIGINT;
1417 :
1418 : /*
1419 : * During authentication the timeout is used to deal with
1420 : * authentication_timeout - we want to quit in response to such timeouts.
1421 : */
1422 6 : if (ClientAuthInProgress)
1423 0 : sig = SIGTERM;
1424 :
1425 : #ifdef HAVE_SETSID
1426 : /* try to signal whole process group */
1427 6 : kill(-MyProcPid, sig);
1428 : #endif
1429 6 : kill(MyProcPid, sig);
1430 6 : }
1431 :
1432 : /*
1433 : * LOCK_TIMEOUT handler: trigger a query-cancel interrupt.
1434 : */
1435 : static void
1436 4 : LockTimeoutHandler(void)
1437 : {
1438 : #ifdef HAVE_SETSID
1439 : /* try to signal whole process group */
1440 4 : kill(-MyProcPid, SIGINT);
1441 : #endif
1442 4 : kill(MyProcPid, SIGINT);
1443 4 : }
1444 :
1445 : static void
1446 1 : TransactionTimeoutHandler(void)
1447 : {
1448 1 : TransactionTimeoutPending = true;
1449 1 : InterruptPending = true;
1450 1 : SetLatch(MyLatch);
1451 1 : }
1452 :
1453 : static void
1454 1 : IdleInTransactionSessionTimeoutHandler(void)
1455 : {
1456 1 : IdleInTransactionSessionTimeoutPending = true;
1457 1 : InterruptPending = true;
1458 1 : SetLatch(MyLatch);
1459 1 : }
1460 :
1461 : static void
1462 1 : IdleSessionTimeoutHandler(void)
1463 : {
1464 1 : IdleSessionTimeoutPending = true;
1465 1 : InterruptPending = true;
1466 1 : SetLatch(MyLatch);
1467 1 : }
1468 :
1469 : static void
1470 19 : IdleStatsUpdateTimeoutHandler(void)
1471 : {
1472 19 : IdleStatsUpdateTimeoutPending = true;
1473 19 : InterruptPending = true;
1474 19 : SetLatch(MyLatch);
1475 19 : }
1476 :
1477 : static void
1478 0 : ClientCheckTimeoutHandler(void)
1479 : {
1480 0 : CheckClientConnectionPending = true;
1481 0 : InterruptPending = true;
1482 0 : SetLatch(MyLatch);
1483 0 : }
1484 :
1485 : /*
1486 : * Returns true if at least one role is defined in this database cluster.
1487 : */
1488 : static bool
1489 76 : ThereIsAtLeastOneRole(void)
1490 : {
1491 : Relation pg_authid_rel;
1492 : TableScanDesc scan;
1493 : bool result;
1494 :
1495 76 : pg_authid_rel = table_open(AuthIdRelationId, AccessShareLock);
1496 :
1497 76 : scan = table_beginscan_catalog(pg_authid_rel, 0, NULL);
1498 76 : result = (heap_getnext(scan, ForwardScanDirection) != NULL);
1499 :
1500 76 : table_endscan(scan);
1501 76 : table_close(pg_authid_rel, AccessShareLock);
1502 :
1503 76 : return result;
1504 : }
1505 :
1506 : /*
1507 : * Stores a warning message to be sent later via EmitConnectionWarnings().
1508 : * Both msg and detail must be non-NULL. If filter is non-NULL, it is called
1509 : * just before the warning is emitted, after startup and role/database settings
1510 : * have been applied.
1511 : *
1512 : * NB: Caller should ensure the strings are palloc'd in a long-lived context
1513 : * like TopMemoryContext. This function takes ownership of the strings, which
1514 : * will be pfree'd in EmitConnectionWarnings().
1515 : */
1516 : void
1517 3 : StoreConnectionWarning(char *msg, char *detail, ConnectionWarningFilter filter)
1518 : {
1519 : MemoryContext oldcontext;
1520 : ConnectionWarning *warning;
1521 :
1522 : Assert(msg);
1523 : Assert(detail);
1524 :
1525 3 : if (ConnectionWarningsEmitted)
1526 0 : elog(ERROR, "StoreConnectionWarning() called after EmitConnectionWarnings()");
1527 :
1528 3 : oldcontext = MemoryContextSwitchTo(TopMemoryContext);
1529 :
1530 3 : warning = palloc_object(ConnectionWarning);
1531 3 : warning->message = msg;
1532 3 : warning->detail = detail;
1533 3 : warning->filter = filter;
1534 3 : ConnectionWarnings = lappend(ConnectionWarnings, warning);
1535 :
1536 3 : MemoryContextSwitchTo(oldcontext);
1537 3 : }
1538 :
1539 : /*
1540 : * Sends the warning messages saved via StoreConnectionWarning() and frees the
1541 : * strings and lists.
1542 : *
1543 : * NB: This can only be called once per backend.
1544 : */
1545 : static void
1546 19262 : EmitConnectionWarnings(void)
1547 : {
1548 19262 : if (ConnectionWarningsEmitted)
1549 0 : elog(ERROR, "EmitConnectionWarnings() called more than once");
1550 : else
1551 19262 : ConnectionWarningsEmitted = true;
1552 :
1553 38527 : foreach_ptr(ConnectionWarning, warning, ConnectionWarnings)
1554 : {
1555 3 : if (warning->filter == NULL || warning->filter())
1556 2 : ereport(WARNING,
1557 : (errmsg("%s", warning->message),
1558 : errdetail("%s", warning->detail)));
1559 :
1560 3 : pfree(warning->message);
1561 3 : pfree(warning->detail);
1562 3 : pfree(warning);
1563 : }
1564 :
1565 19262 : list_free(ConnectionWarnings);
1566 19262 : ConnectionWarnings = NIL;
1567 19262 : }
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