PostgreSQL Source Code  git master
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros
postmaster.h File Reference
This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Macros

#define POSTMASTER_FD_WATCH
 
#define POSTMASTER_FD_OWN   1 /* kept open by postmaster only */
 
#define MAX_BACKENDS   0x3FFFF
 

Functions

void PostmasterMain (int argc, char *argv[]) pg_attribute_noreturn()
 
void ClosePostmasterPorts (bool am_syslogger)
 
int MaxLivePostmasterChildren (void)
 
int GetNumShmemAttachedBgworkers (void)
 
bool PostmasterMarkPIDForWorkerNotify (int)
 

Variables

bool EnableSSL
 
int ReservedBackends
 
int PostPortNumber
 
int Unix_socket_permissions
 
char * Unix_socket_group
 
char * Unix_socket_directories
 
char * ListenAddresses
 
bool ClientAuthInProgress
 
int PreAuthDelay
 
int AuthenticationTimeout
 
bool Log_connections
 
bool log_hostname
 
bool enable_bonjour
 
char * bonjour_name
 
bool restart_after_crash
 
int postmaster_alive_fds [2]
 
const char * progname
 

Macro Definition Documentation

#define POSTMASTER_FD_OWN   1 /* kept open by postmaster only */

Definition at line 44 of file postmaster.h.

Referenced by ClosePostmasterPorts().

#define POSTMASTER_FD_WATCH
Value:
0 /* used in children to check for
* postmaster death */

Definition at line 42 of file postmaster.h.

Referenced by AddWaitEventToSet(), InitPostmasterDeathWatchHandle(), and PostmasterIsAlive().

Function Documentation

void ClosePostmasterPorts ( bool  am_syslogger)

Definition at line 2434 of file postmaster.c.

References close, ereport, errcode_for_file_access(), errmsg_internal(), FATAL, i, ListenSocket, MAXLISTEN, PGINVALID_SOCKET, postmaster_alive_fds, POSTMASTER_FD_OWN, StreamClose(), and syslogPipe.

Referenced by BackendStartup(), do_start_bgworker(), pgarch_start(), pgstat_start(), StartAutoVacLauncher(), StartAutoVacWorker(), StartChildProcess(), and SysLogger_Start().

2435 {
2436  int i;
2437 
2438 #ifndef WIN32
2439 
2440  /*
2441  * Close the write end of postmaster death watch pipe. It's important to
2442  * do this as early as possible, so that if postmaster dies, others won't
2443  * think that it's still running because we're holding the pipe open.
2444  */
2446  ereport(FATAL,
2448  errmsg_internal("could not close postmaster death monitoring pipe in child process: %m")));
2450 #endif
2451 
2452  /* Close the listen sockets */
2453  for (i = 0; i < MAXLISTEN; i++)
2454  {
2455  if (ListenSocket[i] != PGINVALID_SOCKET)
2456  {
2459  }
2460  }
2461 
2462  /* If using syslogger, close the read side of the pipe */
2463  if (!am_syslogger)
2464  {
2465 #ifndef WIN32
2466  if (syslogPipe[0] >= 0)
2467  close(syslogPipe[0]);
2468  syslogPipe[0] = -1;
2469 #else
2470  if (syslogPipe[0])
2471  CloseHandle(syslogPipe[0]);
2472  syslogPipe[0] = 0;
2473 #endif
2474  }
2475 
2476 #ifdef USE_BONJOUR
2477  /* If using Bonjour, close the connection to the mDNS daemon */
2478  if (bonjour_sdref)
2479  close(DNSServiceRefSockFD(bonjour_sdref));
2480 #endif
2481 }
void StreamClose(pgsocket sock)
Definition: pqcomm.c:825
#define FATAL
Definition: elog.h:52
bool am_syslogger
Definition: syslogger.c:74
#define POSTMASTER_FD_OWN
Definition: postmaster.h:44
int errcode_for_file_access(void)
Definition: elog.c:598
#define ereport(elevel, rest)
Definition: elog.h:122
int postmaster_alive_fds[2]
Definition: postmaster.c:558
static pgsocket ListenSocket[MAXLISTEN]
Definition: postmaster.c:215
#define PGINVALID_SOCKET
Definition: port.h:24
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
int i
#define close(a)
Definition: win32.h:12
#define MAXLISTEN
Definition: postmaster.c:214
int syslogPipe[2]
Definition: syslogger.c:112
int GetNumShmemAttachedBgworkers ( void  )
int MaxLivePostmasterChildren ( void  )

Definition at line 5456 of file postmaster.c.

References autovacuum_max_workers, max_worker_processes, and MaxConnections.

Referenced by canAcceptConnections(), PMSignalShmemInit(), PMSignalShmemSize(), and processCancelRequest().

5457 {
5458  return 2 * (MaxConnections + autovacuum_max_workers + 1 +
5460 }
int MaxConnections
Definition: globals.c:124
int autovacuum_max_workers
Definition: autovacuum.c:113
int max_worker_processes
Definition: globals.c:125
void PostmasterMain ( int  argc,
char *  argv[] 
)

Definition at line 568 of file postmaster.c.

References AddToDataDirLockFile(), ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate(), ApplyLauncherRegister(), ARCHIVE_MODE_OFF, Assert, autovac_init(), BlockSig, bonjour_name, ChangeToDataDir(), checkDataDir(), CheckDateTokenTables(), CloseServerPorts(), CreateDataDirLockFile(), CreateOptsFile(), DEBUG3, DestNone, dummy_handler(), elog, enable_bonjour, EnableSSL, environ, ereport, errcode(), errcode_for_file_access(), errhint(), errmsg(), errmsg_internal(), ERROR, ExitPostmaster(), external_pid_file, ExtraOptions, FATAL, free, get_stats_option_name(), GetConfigOption(), GetCurrentTimestamp(), getInstallationPaths(), getopt(), gettimeofday(), i, InitializeGUCOptions(), InitializeMaxBackends(), InitPostmasterDeathWatchHandle(), IsBinaryUpgrade, IsPostmasterEnvironment, lfirst, list_free(), list_free_deep(), ListenAddresses, ListenSocket, load_hba(), load_ident(), LOCK_FILE_LINE_LISTEN_ADDR, LOCK_FILE_LINE_SOCKET_DIR, LOG, Log_destination, LOG_DESTINATION_STDERR, Log_destination_string, LOG_METAINFO_DATAFILE, max_wal_senders, MaxConnections, MAXLISTEN, maybe_start_bgworkers(), MemoryContextSwitchTo(), my_exec_path, MyProcPid, MyStartTime, name, NIL, NULL, on_proc_exit(), optarg, opterr, optind, ParseLongOption(), pfree(), PG_SETMASK, PGC_POSTMASTER, PGC_S_ARGV, PGINVALID_SOCKET, PgStartTime, pgstat_init(), PM_STARTUP, pmdie(), pmState, PostmasterContext, PostmasterPid, PostPortNumber, pqinitmask(), pqsignal(), pqsignal_no_restart(), process_shared_preload_libraries(), progname, pstrdup(), random_start_time, reaper(), Reinit, RemovePgTempFiles(), RemovePromoteSignalFiles(), ReservedBackends, reset_shared(), S_IRGRP, S_IROTH, S_IRWXG, S_IRWXO, secure_initialize(), SelectConfigFiles(), SendStop, ServerLoop(), set_debug_options(), set_max_safe_fds(), set_plan_disabling_options(), set_stack_base(), SetConfigOption(), SIG_IGN, SIGALRM, SIGCHLD, SIGHUP, SIGHUP_handler(), SIGPIPE, SIGQUIT, SIGTTIN, SIGTTOU, SIGUSR1, sigusr1_handler(), SIGUSR2, snprintf(), SplitDirectoriesString(), SplitIdentifierString(), srandom(), STARTUP_RUNNING, StartupDataBase, StartupPID, StartupStatus, status(), STATUS_OK, StreamServerPort(), strerror(), success, SysLogger_Start(), SysLoggerPID, TopMemoryContext, Unix_socket_directories, unlink(), unlink_external_pid_file(), userDoption, value, wal_level, WAL_LEVEL_MINIMAL, WARNING, whereToSendOutput, write_stderr, and XLogArchiveMode.

Referenced by main().

569 {
570  int opt;
571  int status;
572  char *userDoption = NULL;
573  bool listen_addr_saved = false;
574  int i;
575  char *output_config_variable = NULL;
576 
577  MyProcPid = PostmasterPid = getpid();
578 
579  MyStartTime = time(NULL);
580 
582 
583  /*
584  * for security, no dir or file created can be group or other accessible
585  */
586  umask(S_IRWXG | S_IRWXO);
587 
588  /*
589  * Initialize random(3) so we don't get the same values in every run.
590  *
591  * Note: the seed is pretty predictable from externally-visible facts such
592  * as postmaster start time, so avoid using random() for security-critical
593  * random values during postmaster startup. At the time of first
594  * connection, PostmasterRandom will select a hopefully-more-random seed.
595  */
596  srandom((unsigned int) (MyProcPid ^ MyStartTime));
597 
598  /*
599  * By default, palloc() requests in the postmaster will be allocated in
600  * the PostmasterContext, which is space that can be recycled by backends.
601  * Allocated data that needs to be available to backends should be
602  * allocated in TopMemoryContext.
603  */
605  "Postmaster",
608 
609  /* Initialize paths to installation files */
610  getInstallationPaths(argv[0]);
611 
612  /*
613  * Set up signal handlers for the postmaster process.
614  *
615  * In the postmaster, we want to install non-ignored handlers *without*
616  * SA_RESTART. This is because they'll be blocked at all times except
617  * when ServerLoop is waiting for something to happen, and during that
618  * window, we want signals to exit the select(2) wait so that ServerLoop
619  * can respond if anything interesting happened. On some platforms,
620  * signals marked SA_RESTART would not cause the select() wait to end.
621  * Child processes will generally want SA_RESTART, but we expect them to
622  * set up their own handlers before unblocking signals.
623  *
624  * CAUTION: when changing this list, check for side-effects on the signal
625  * handling setup of child processes. See tcop/postgres.c,
626  * bootstrap/bootstrap.c, postmaster/bgwriter.c, postmaster/walwriter.c,
627  * postmaster/autovacuum.c, postmaster/pgarch.c, postmaster/pgstat.c,
628  * postmaster/syslogger.c, postmaster/bgworker.c and
629  * postmaster/checkpointer.c.
630  */
631  pqinitmask();
633 
634  pqsignal_no_restart(SIGHUP, SIGHUP_handler); /* reread config file and
635  * have children do same */
636  pqsignal_no_restart(SIGINT, pmdie); /* send SIGTERM and shut down */
637  pqsignal_no_restart(SIGQUIT, pmdie); /* send SIGQUIT and die */
638  pqsignal_no_restart(SIGTERM, pmdie); /* wait for children and shut down */
639  pqsignal(SIGALRM, SIG_IGN); /* ignored */
640  pqsignal(SIGPIPE, SIG_IGN); /* ignored */
641  pqsignal_no_restart(SIGUSR1, sigusr1_handler); /* message from child
642  * process */
643  pqsignal_no_restart(SIGUSR2, dummy_handler); /* unused, reserve for
644  * children */
645  pqsignal_no_restart(SIGCHLD, reaper); /* handle child termination */
646  pqsignal(SIGTTIN, SIG_IGN); /* ignored */
647  pqsignal(SIGTTOU, SIG_IGN); /* ignored */
648  /* ignore SIGXFSZ, so that ulimit violations work like disk full */
649 #ifdef SIGXFSZ
650  pqsignal(SIGXFSZ, SIG_IGN); /* ignored */
651 #endif
652 
653  /*
654  * Options setup
655  */
657 
658  opterr = 1;
659 
660  /*
661  * Parse command-line options. CAUTION: keep this in sync with
662  * tcop/postgres.c (the option sets should not conflict) and with the
663  * common help() function in main/main.c.
664  */
665  while ((opt = getopt(argc, argv, "B:bc:C:D:d:EeFf:h:ijk:lN:nOo:Pp:r:S:sTt:W:-:")) != -1)
666  {
667  switch (opt)
668  {
669  case 'B':
670  SetConfigOption("shared_buffers", optarg, PGC_POSTMASTER, PGC_S_ARGV);
671  break;
672 
673  case 'b':
674  /* Undocumented flag used for binary upgrades */
675  IsBinaryUpgrade = true;
676  break;
677 
678  case 'C':
679  output_config_variable = strdup(optarg);
680  break;
681 
682  case 'D':
683  userDoption = strdup(optarg);
684  break;
685 
686  case 'd':
688  break;
689 
690  case 'E':
691  SetConfigOption("log_statement", "all", PGC_POSTMASTER, PGC_S_ARGV);
692  break;
693 
694  case 'e':
695  SetConfigOption("datestyle", "euro", PGC_POSTMASTER, PGC_S_ARGV);
696  break;
697 
698  case 'F':
699  SetConfigOption("fsync", "false", PGC_POSTMASTER, PGC_S_ARGV);
700  break;
701 
702  case 'f':
704  {
705  write_stderr("%s: invalid argument for option -f: \"%s\"\n",
706  progname, optarg);
707  ExitPostmaster(1);
708  }
709  break;
710 
711  case 'h':
712  SetConfigOption("listen_addresses", optarg, PGC_POSTMASTER, PGC_S_ARGV);
713  break;
714 
715  case 'i':
716  SetConfigOption("listen_addresses", "*", PGC_POSTMASTER, PGC_S_ARGV);
717  break;
718 
719  case 'j':
720  /* only used by interactive backend */
721  break;
722 
723  case 'k':
724  SetConfigOption("unix_socket_directories", optarg, PGC_POSTMASTER, PGC_S_ARGV);
725  break;
726 
727  case 'l':
728  SetConfigOption("ssl", "true", PGC_POSTMASTER, PGC_S_ARGV);
729  break;
730 
731  case 'N':
732  SetConfigOption("max_connections", optarg, PGC_POSTMASTER, PGC_S_ARGV);
733  break;
734 
735  case 'n':
736  /* Don't reinit shared mem after abnormal exit */
737  Reinit = false;
738  break;
739 
740  case 'O':
741  SetConfigOption("allow_system_table_mods", "true", PGC_POSTMASTER, PGC_S_ARGV);
742  break;
743 
744  case 'o':
745  /* Other options to pass to the backend on the command line */
747  sizeof(ExtraOptions) - strlen(ExtraOptions),
748  " %s", optarg);
749  break;
750 
751  case 'P':
752  SetConfigOption("ignore_system_indexes", "true", PGC_POSTMASTER, PGC_S_ARGV);
753  break;
754 
755  case 'p':
757  break;
758 
759  case 'r':
760  /* only used by single-user backend */
761  break;
762 
763  case 'S':
765  break;
766 
767  case 's':
768  SetConfigOption("log_statement_stats", "true", PGC_POSTMASTER, PGC_S_ARGV);
769  break;
770 
771  case 'T':
772 
773  /*
774  * In the event that some backend dumps core, send SIGSTOP,
775  * rather than SIGQUIT, to all its peers. This lets the wily
776  * post_hacker collect core dumps from everyone.
777  */
778  SendStop = true;
779  break;
780 
781  case 't':
782  {
783  const char *tmp = get_stats_option_name(optarg);
784 
785  if (tmp)
786  {
788  }
789  else
790  {
791  write_stderr("%s: invalid argument for option -t: \"%s\"\n",
792  progname, optarg);
793  ExitPostmaster(1);
794  }
795  break;
796  }
797 
798  case 'W':
799  SetConfigOption("post_auth_delay", optarg, PGC_POSTMASTER, PGC_S_ARGV);
800  break;
801 
802  case 'c':
803  case '-':
804  {
805  char *name,
806  *value;
807 
808  ParseLongOption(optarg, &name, &value);
809  if (!value)
810  {
811  if (opt == '-')
812  ereport(ERROR,
813  (errcode(ERRCODE_SYNTAX_ERROR),
814  errmsg("--%s requires a value",
815  optarg)));
816  else
817  ereport(ERROR,
818  (errcode(ERRCODE_SYNTAX_ERROR),
819  errmsg("-c %s requires a value",
820  optarg)));
821  }
822 
824  free(name);
825  if (value)
826  free(value);
827  break;
828  }
829 
830  default:
831  write_stderr("Try \"%s --help\" for more information.\n",
832  progname);
833  ExitPostmaster(1);
834  }
835  }
836 
837  /*
838  * Postmaster accepts no non-option switch arguments.
839  */
840  if (optind < argc)
841  {
842  write_stderr("%s: invalid argument: \"%s\"\n",
843  progname, argv[optind]);
844  write_stderr("Try \"%s --help\" for more information.\n",
845  progname);
846  ExitPostmaster(1);
847  }
848 
849  /*
850  * Locate the proper configuration files and data directory, and read
851  * postgresql.conf for the first time.
852  */
853  if (!SelectConfigFiles(userDoption, progname))
854  ExitPostmaster(2);
855 
856  if (output_config_variable != NULL)
857  {
858  /*
859  * "-C guc" was specified, so print GUC's value and exit. No extra
860  * permission check is needed because the user is reading inside the
861  * data dir.
862  */
863  const char *config_val = GetConfigOption(output_config_variable,
864  false, false);
865 
866  puts(config_val ? config_val : "");
867  ExitPostmaster(0);
868  }
869 
870  /* Verify that DataDir looks reasonable */
871  checkDataDir();
872 
873  /* And switch working directory into it */
874  ChangeToDataDir();
875 
876  /*
877  * Check for invalid combinations of GUC settings.
878  */
880  {
881  write_stderr("%s: superuser_reserved_connections must be less than max_connections\n", progname);
882  ExitPostmaster(1);
883  }
885  {
886  write_stderr("%s: max_wal_senders must be less than max_connections\n", progname);
887  ExitPostmaster(1);
888  }
890  ereport(ERROR,
891  (errmsg("WAL archival cannot be enabled when wal_level is \"minimal\"")));
893  ereport(ERROR,
894  (errmsg("WAL streaming (max_wal_senders > 0) requires wal_level \"replica\" or \"logical\"")));
895 
896  /*
897  * Other one-time internal sanity checks can go here, if they are fast.
898  * (Put any slow processing further down, after postmaster.pid creation.)
899  */
900  if (!CheckDateTokenTables())
901  {
902  write_stderr("%s: invalid datetoken tables, please fix\n", progname);
903  ExitPostmaster(1);
904  }
905 
906  /*
907  * Now that we are done processing the postmaster arguments, reset
908  * getopt(3) library so that it will work correctly in subprocesses.
909  */
910  optind = 1;
911 #ifdef HAVE_INT_OPTRESET
912  optreset = 1; /* some systems need this too */
913 #endif
914 
915  /* For debugging: display postmaster environment */
916  {
917  extern char **environ;
918  char **p;
919 
920  ereport(DEBUG3,
921  (errmsg_internal("%s: PostmasterMain: initial environment dump:",
922  progname)));
923  ereport(DEBUG3,
924  (errmsg_internal("-----------------------------------------")));
925  for (p = environ; *p; ++p)
926  ereport(DEBUG3,
927  (errmsg_internal("\t%s", *p)));
928  ereport(DEBUG3,
929  (errmsg_internal("-----------------------------------------")));
930  }
931 
932  /*
933  * Create lockfile for data directory.
934  *
935  * We want to do this before we try to grab the input sockets, because the
936  * data directory interlock is more reliable than the socket-file
937  * interlock (thanks to whoever decided to put socket files in /tmp :-().
938  * For the same reason, it's best to grab the TCP socket(s) before the
939  * Unix socket(s).
940  *
941  * Also note that this internally sets up the on_proc_exit function that
942  * is responsible for removing both data directory and socket lockfiles;
943  * so it must happen before opening sockets so that at exit, the socket
944  * lockfiles go away after CloseServerPorts runs.
945  */
946  CreateDataDirLockFile(true);
947 
948  /*
949  * Initialize SSL library, if specified.
950  */
951 #ifdef USE_SSL
952  if (EnableSSL)
953  {
954  (void) secure_initialize(true);
955  LoadedSSL = true;
956  }
957 #endif
958 
959  /*
960  * Register the apply launcher. Since it registers a background worker,
961  * it needs to be called before InitializeMaxBackends(), and it's probably
962  * a good idea to call it before any modules had chance to take the
963  * background worker slots.
964  */
966 
967  /*
968  * process any libraries that should be preloaded at postmaster start
969  */
971 
972  /*
973  * Now that loadable modules have had their chance to register background
974  * workers, calculate MaxBackends.
975  */
977 
978  /*
979  * Establish input sockets.
980  *
981  * First, mark them all closed, and set up an on_proc_exit function that's
982  * charged with closing the sockets again at postmaster shutdown.
983  */
984  for (i = 0; i < MAXLISTEN; i++)
986 
988 
989  if (ListenAddresses)
990  {
991  char *rawstring;
992  List *elemlist;
993  ListCell *l;
994  int success = 0;
995 
996  /* Need a modifiable copy of ListenAddresses */
997  rawstring = pstrdup(ListenAddresses);
998 
999  /* Parse string into list of hostnames */
1000  if (!SplitIdentifierString(rawstring, ',', &elemlist))
1001  {
1002  /* syntax error in list */
1003  ereport(FATAL,
1004  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1005  errmsg("invalid list syntax in parameter \"%s\"",
1006  "listen_addresses")));
1007  }
1008 
1009  foreach(l, elemlist)
1010  {
1011  char *curhost = (char *) lfirst(l);
1012 
1013  if (strcmp(curhost, "*") == 0)
1014  status = StreamServerPort(AF_UNSPEC, NULL,
1015  (unsigned short) PostPortNumber,
1016  NULL,
1018  else
1019  status = StreamServerPort(AF_UNSPEC, curhost,
1020  (unsigned short) PostPortNumber,
1021  NULL,
1022  ListenSocket, MAXLISTEN);
1023 
1024  if (status == STATUS_OK)
1025  {
1026  success++;
1027  /* record the first successful host addr in lockfile */
1028  if (!listen_addr_saved)
1029  {
1031  listen_addr_saved = true;
1032  }
1033  }
1034  else
1035  ereport(WARNING,
1036  (errmsg("could not create listen socket for \"%s\"",
1037  curhost)));
1038  }
1039 
1040  if (!success && elemlist != NIL)
1041  ereport(FATAL,
1042  (errmsg("could not create any TCP/IP sockets")));
1043 
1044  list_free(elemlist);
1045  pfree(rawstring);
1046  }
1047 
1048 #ifdef USE_BONJOUR
1049  /* Register for Bonjour only if we opened TCP socket(s) */
1050  if (enable_bonjour && ListenSocket[0] != PGINVALID_SOCKET)
1051  {
1052  DNSServiceErrorType err;
1053 
1054  /*
1055  * We pass 0 for interface_index, which will result in registering on
1056  * all "applicable" interfaces. It's not entirely clear from the
1057  * DNS-SD docs whether this would be appropriate if we have bound to
1058  * just a subset of the available network interfaces.
1059  */
1060  err = DNSServiceRegister(&bonjour_sdref,
1061  0,
1062  0,
1063  bonjour_name,
1064  "_postgresql._tcp.",
1065  NULL,
1066  NULL,
1067  htons(PostPortNumber),
1068  0,
1069  NULL,
1070  NULL,
1071  NULL);
1072  if (err != kDNSServiceErr_NoError)
1073  elog(LOG, "DNSServiceRegister() failed: error code %ld",
1074  (long) err);
1075 
1076  /*
1077  * We don't bother to read the mDNS daemon's reply, and we expect that
1078  * it will automatically terminate our registration when the socket is
1079  * closed at postmaster termination. So there's nothing more to be
1080  * done here. However, the bonjour_sdref is kept around so that
1081  * forked children can close their copies of the socket.
1082  */
1083  }
1084 #endif
1085 
1086 #ifdef HAVE_UNIX_SOCKETS
1088  {
1089  char *rawstring;
1090  List *elemlist;
1091  ListCell *l;
1092  int success = 0;
1093 
1094  /* Need a modifiable copy of Unix_socket_directories */
1095  rawstring = pstrdup(Unix_socket_directories);
1096 
1097  /* Parse string into list of directories */
1098  if (!SplitDirectoriesString(rawstring, ',', &elemlist))
1099  {
1100  /* syntax error in list */
1101  ereport(FATAL,
1102  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
1103  errmsg("invalid list syntax in parameter \"%s\"",
1104  "unix_socket_directories")));
1105  }
1106 
1107  foreach(l, elemlist)
1108  {
1109  char *socketdir = (char *) lfirst(l);
1110 
1111  status = StreamServerPort(AF_UNIX, NULL,
1112  (unsigned short) PostPortNumber,
1113  socketdir,
1114  ListenSocket, MAXLISTEN);
1115 
1116  if (status == STATUS_OK)
1117  {
1118  success++;
1119  /* record the first successful Unix socket in lockfile */
1120  if (success == 1)
1122  }
1123  else
1124  ereport(WARNING,
1125  (errmsg("could not create Unix-domain socket in directory \"%s\"",
1126  socketdir)));
1127  }
1128 
1129  if (!success && elemlist != NIL)
1130  ereport(FATAL,
1131  (errmsg("could not create any Unix-domain sockets")));
1132 
1133  list_free_deep(elemlist);
1134  pfree(rawstring);
1135  }
1136 #endif
1137 
1138  /*
1139  * check that we have some socket to listen on
1140  */
1141  if (ListenSocket[0] == PGINVALID_SOCKET)
1142  ereport(FATAL,
1143  (errmsg("no socket created for listening")));
1144 
1145  /*
1146  * If no valid TCP ports, write an empty line for listen address,
1147  * indicating the Unix socket must be used. Note that this line is not
1148  * added to the lock file until there is a socket backing it.
1149  */
1150  if (!listen_addr_saved)
1152 
1153  /*
1154  * Set up shared memory and semaphores.
1155  */
1157 
1158  /*
1159  * Estimate number of openable files. This must happen after setting up
1160  * semaphores, because on some platforms semaphores count as open files.
1161  */
1162  set_max_safe_fds();
1163 
1164  /*
1165  * Set reference point for stack-depth checking.
1166  */
1167  set_stack_base();
1168 
1169  /*
1170  * Initialize pipe (or process handle on Windows) that allows children to
1171  * wake up from sleep on postmaster death.
1172  */
1174 
1175 #ifdef WIN32
1176 
1177  /*
1178  * Initialize I/O completion port used to deliver list of dead children.
1179  */
1180  win32ChildQueue = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 1);
1181  if (win32ChildQueue == NULL)
1182  ereport(FATAL,
1183  (errmsg("could not create I/O completion port for child queue")));
1184 #endif
1185 
1186  /*
1187  * Record postmaster options. We delay this till now to avoid recording
1188  * bogus options (eg, NBuffers too high for available memory).
1189  */
1190  if (!CreateOptsFile(argc, argv, my_exec_path))
1191  ExitPostmaster(1);
1192 
1193 #ifdef EXEC_BACKEND
1194  /* Write out nondefault GUC settings for child processes to use */
1195  write_nondefault_variables(PGC_POSTMASTER);
1196 #endif
1197 
1198  /*
1199  * Write the external PID file if requested
1200  */
1201  if (external_pid_file)
1202  {
1203  FILE *fpidfile = fopen(external_pid_file, "w");
1204 
1205  if (fpidfile)
1206  {
1207  fprintf(fpidfile, "%d\n", MyProcPid);
1208  fclose(fpidfile);
1209 
1210  /* Make PID file world readable */
1211  if (chmod(external_pid_file, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) != 0)
1212  write_stderr("%s: could not change permissions of external PID file \"%s\": %s\n",
1214  }
1215  else
1216  write_stderr("%s: could not write external PID file \"%s\": %s\n",
1218 
1220  }
1221 
1222  /*
1223  * Remove old temporary files. At this point there can be no other
1224  * Postgres processes running in this directory, so this should be safe.
1225  */
1227 
1228  /*
1229  * Forcibly remove the files signaling a standby promotion request.
1230  * Otherwise, the existence of those files triggers a promotion too early,
1231  * whether a user wants that or not.
1232  *
1233  * This removal of files is usually unnecessary because they can exist
1234  * only during a few moments during a standby promotion. However there is
1235  * a race condition: if pg_ctl promote is executed and creates the files
1236  * during a promotion, the files can stay around even after the server is
1237  * brought up to new master. Then, if new standby starts by using the
1238  * backup taken from that master, the files can exist at the server
1239  * startup and should be removed in order to avoid an unexpected
1240  * promotion.
1241  *
1242  * Note that promotion signal files need to be removed before the startup
1243  * process is invoked. Because, after that, they can be used by
1244  * postmaster's SIGUSR1 signal handler.
1245  */
1247 
1248  /* Remove any outdated file holding the current log filenames. */
1249  if (unlink(LOG_METAINFO_DATAFILE) < 0 && errno != ENOENT)
1250  ereport(LOG,
1252  errmsg("could not remove file \"%s\": %m",
1254 
1255  /*
1256  * If enabled, start up syslogger collection subprocess
1257  */
1259 
1260  /*
1261  * Reset whereToSendOutput from DestDebug (its starting state) to
1262  * DestNone. This stops ereport from sending log messages to stderr unless
1263  * Log_destination permits. We don't do this until the postmaster is
1264  * fully launched, since startup failures may as well be reported to
1265  * stderr.
1266  *
1267  * If we are in fact disabling logging to stderr, first emit a log message
1268  * saying so, to provide a breadcrumb trail for users who may not remember
1269  * that their logging is configured to go somewhere else.
1270  */
1272  ereport(LOG,
1273  (errmsg("ending log output to stderr"),
1274  errhint("Future log output will go to log destination \"%s\".",
1276 
1278 
1279  /*
1280  * Initialize stats collection subsystem (this does NOT start the
1281  * collector process!)
1282  */
1283  pgstat_init();
1284 
1285  /*
1286  * Initialize the autovacuum subsystem (again, no process start yet)
1287  */
1288  autovac_init();
1289 
1290  /*
1291  * Load configuration files for client authentication.
1292  */
1293  if (!load_hba())
1294  {
1295  /*
1296  * It makes no sense to continue if we fail to load the HBA file,
1297  * since there is no way to connect to the database in this case.
1298  */
1299  ereport(FATAL,
1300  (errmsg("could not load pg_hba.conf")));
1301  }
1302  if (!load_ident())
1303  {
1304  /*
1305  * We can start up without the IDENT file, although it means that you
1306  * cannot log in using any of the authentication methods that need a
1307  * user name mapping. load_ident() already logged the details of error
1308  * to the log.
1309  */
1310  }
1311 
1312 #ifdef HAVE_PTHREAD_IS_THREADED_NP
1313 
1314  /*
1315  * On macOS, libintl replaces setlocale() with a version that calls
1316  * CFLocaleCopyCurrent() when its second argument is "" and every relevant
1317  * environment variable is unset or empty. CFLocaleCopyCurrent() makes
1318  * the process multithreaded. The postmaster calls sigprocmask() and
1319  * calls fork() without an immediate exec(), both of which have undefined
1320  * behavior in a multithreaded program. A multithreaded postmaster is the
1321  * normal case on Windows, which offers neither fork() nor sigprocmask().
1322  */
1323  if (pthread_is_threaded_np() != 0)
1324  ereport(FATAL,
1325  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1326  errmsg("postmaster became multithreaded during startup"),
1327  errhint("Set the LC_ALL environment variable to a valid locale.")));
1328 #endif
1329 
1330  /*
1331  * Remember postmaster startup time
1332  */
1334 #ifndef HAVE_STRONG_RANDOM
1335  /* RandomCancelKey wants its own copy */
1337 #endif
1338 
1339  /*
1340  * We're ready to rock and roll...
1341  */
1343  Assert(StartupPID != 0);
1345  pmState = PM_STARTUP;
1346 
1347  /* Some workers may be scheduled to start now */
1349 
1350  status = ServerLoop();
1351 
1352  /*
1353  * ServerLoop probably shouldn't ever return, but if it does, close down.
1354  */
1355  ExitPostmaster(status != STATUS_OK);
1356 
1357  abort(); /* not reached */
1358 }
pg_stack_base_t set_stack_base(void)
Definition: postgres.c:3064
const char * GetConfigOption(const char *name, bool missing_ok, bool restrict_superuser)
Definition: guc.c:6696
int secure_initialize(bool isServerStart)
Definition: be-secure.c:73
#define NIL
Definition: pg_list.h:69
bool IsPostmasterEnvironment
Definition: globals.c:100
bool EnableSSL
Definition: postmaster.c:233
#define SIGUSR1
Definition: win32.h:202
static StartupStatusEnum StartupStatus
Definition: postmaster.c:266
int gettimeofday(struct timeval *tp, struct timezone *tzp)
Definition: gettimeofday.c:105
static void unlink_external_pid_file(int status, Datum arg)
Definition: postmaster.c:1401
int MyProcPid
Definition: globals.c:39
int errhint(const char *fmt,...)
Definition: elog.c:987
#define StartupDataBase()
Definition: postmaster.c:542
#define LOCK_FILE_LINE_LISTEN_ADDR
Definition: miscadmin.h:456
#define DEBUG3
Definition: elog.h:23
TimestampTz GetCurrentTimestamp(void)
Definition: timestamp.c:1570
pqsigfunc pqsignal_no_restart(int signo, pqsigfunc func)
Definition: pqsignal.c:71
void on_proc_exit(pg_on_exit_callback function, Datum arg)
Definition: ipc.c:292
void AddToDataDirLockFile(int target_line, const char *str)
Definition: miscinit.c:1156
int wal_level
Definition: xlog.c:104
char * pstrdup(const char *in)
Definition: mcxt.c:1077
static void dummy_handler(SIGNAL_ARGS)
Definition: postmaster.c:5124
void ParseLongOption(const char *string, char **name, char **value)
Definition: guc.c:9374
pg_time_t MyStartTime
Definition: globals.c:40
bool set_plan_disabling_options(const char *arg, GucContext context, GucSource source)
Definition: postgres.c:3241
#define SIGTTIN
Definition: win32.h:199
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
#define write_stderr(str)
Definition: parallel.c:180
static bool CreateOptsFile(int argc, char *argv[], char *fullprogname)
Definition: postmaster.c:5416
bool CheckDateTokenTables(void)
Definition: datetime.c:4464
int errcode(int sqlerrcode)
Definition: elog.c:575
#define LOG_METAINFO_DATAFILE
Definition: syslogger.h:94
const char * get_stats_option_name(const char *arg)
Definition: postgres.c:3283
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
int SysLogger_Start(void)
Definition: syslogger.c:520
void set_debug_options(int debug_flag, GucContext context, GucSource source)
Definition: postgres.c:3212
#define LOG
Definition: elog.h:26
const char * progname
Definition: pg_standby.c:37
void list_free_deep(List *list)
Definition: list.c:1147
char * Unix_socket_directories
Definition: postmaster.c:197
bool IsBinaryUpgrade
Definition: globals.c:102
#define SIGQUIT
Definition: win32.h:189
int getopt(int nargc, char *const *nargv, const char *ostr)
Definition: getopt.c:72
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
bool load_ident(void)
Definition: hba.c:2876
void autovac_init(void)
Definition: autovacuum.c:3341
void pqinitmask(void)
Definition: pqsignal.c:41
static void CloseServerPorts(int status, Datum arg)
Definition: postmaster.c:1365
static void InitPostmasterDeathWatchHandle(void)
Definition: postmaster.c:6314
bool SplitDirectoriesString(char *rawstring, char separator, List **namelist)
Definition: varlena.c:3375
static void checkDataDir(void)
Definition: postmaster.c:1464
void pfree(void *pointer)
Definition: mcxt.c:950
#define SIG_IGN
Definition: win32.h:185
int optind
Definition: getopt.c:51
#define ERROR
Definition: elog.h:43
void CreateDataDirLockFile(bool amPostmaster)
Definition: miscinit.c:1080
static pid_t StartupPID
Definition: postmaster.c:247
int PostPortNumber
Definition: postmaster.c:194
int ReservedBackends
Definition: postmaster.c:211
static void ExitPostmaster(int status) pg_attribute_noreturn()
Definition: postmaster.c:4923
#define FATAL
Definition: elog.h:52
static struct @121 value
char * external_pid_file
Definition: guc.c:465
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:165
#define S_IRGRP
Definition: win32.h:448
#define LOCK_FILE_LINE_SOCKET_DIR
Definition: miscadmin.h:455
static bool success
Definition: pg_basebackup.c:96
Definition: dest.h:88
void SetConfigOption(const char *name, const char *value, GucContext context, GucSource source)
Definition: guc.c:6672
bool load_hba(void)
Definition: hba.c:2094
char * bonjour_name
Definition: postmaster.c:243
bool SplitIdentifierString(char *rawstring, char separator, List **namelist)
Definition: varlena.c:3248
int XLogArchiveMode
Definition: xlog.c:94
int errcode_for_file_access(void)
Definition: elog.c:598
static pid_t SysLoggerPID
Definition: postmaster.c:255
#define S_IROTH
Definition: win32.h:452
void ChangeToDataDir(void)
Definition: miscinit.c:115
int opterr
Definition: getopt.c:50
static void getInstallationPaths(const char *argv0)
Definition: postmaster.c:1413
char * Log_destination_string
Definition: elog.c:107
char * ListenAddresses
Definition: postmaster.c:200
int StreamServerPort(int family, char *hostName, unsigned short portNumber, char *unixSocketDir, pgsocket ListenSocket[], int MaxListen)
Definition: pqcomm.c:311
int unlink(const char *filename)
#define ereport(elevel, rest)
Definition: elog.h:122
#define STATUS_OK
Definition: c.h:975
MemoryContext TopMemoryContext
Definition: mcxt.c:43
static void pmdie(SIGNAL_ARGS)
Definition: postmaster.c:2579
static void SIGHUP_handler(SIGNAL_ARGS)
Definition: postmaster.c:2506
bool enable_bonjour
Definition: postmaster.c:242
void RemovePromoteSignalFiles(void)
Definition: xlog.c:12069
int max_wal_senders
Definition: walsender.c:120
pid_t PostmasterPid
Definition: globals.c:87
#define WARNING
Definition: elog.h:40
char my_exec_path[MAXPGPATH]
Definition: globals.c:64
sigset_t BlockSig
Definition: pqsignal.c:22
static pgsocket ListenSocket[MAXLISTEN]
Definition: postmaster.c:215
MemoryContext AllocSetContextCreate(MemoryContext parent, const char *name, Size minContextSize, Size initBlockSize, Size maxBlockSize)
Definition: aset.c:322
static PMState pmState
Definition: postmaster.c:338
bool SelectConfigFiles(const char *userDoption, const char *progname)
Definition: guc.c:4689
void ApplyLauncherRegister(void)
Definition: launcher.c:698
#define PGINVALID_SOCKET
Definition: port.h:24
int MaxConnections
Definition: globals.c:124
TimestampTz PgStartTime
Definition: timestamp.c:49
#define SIGPIPE
Definition: win32.h:193
#define S_IRWXO
Definition: win32.h:455
#define SIGHUP
Definition: win32.h:188
#define LOG_DESTINATION_STDERR
Definition: elog.h:395
static void reset_shared(int port)
Definition: postmaster.c:2488
static bool Reinit
Definition: postmaster.c:229
pqsigfunc pqsignal(int signum, pqsigfunc handler)
Definition: signal.c:168
#define free(a)
Definition: header.h:65
int errmsg_internal(const char *fmt,...)
Definition: elog.c:827
#define NULL
Definition: c.h:229
static char ExtraOptions[MAXPGPATH]
Definition: postmaster.c:220
static int ServerLoop(void)
Definition: postmaster.c:1658
#define Assert(condition)
Definition: c.h:675
#define lfirst(lc)
Definition: pg_list.h:106
void RemovePgTempFiles(void)
Definition: fd.c:2706
static void reaper(SIGNAL_ARGS)
Definition: postmaster.c:2749
void InitializeMaxBackends(void)
Definition: postinit.c:495
const char * name
Definition: encode.c:521
#define S_IRWXG
Definition: win32.h:451
#define SIGTTOU
Definition: win32.h:200
static const char * userDoption
Definition: postgres.c:154
void set_max_safe_fds(void)
Definition: fd.c:881
int errmsg(const char *fmt,...)
Definition: elog.c:797
char * optarg
Definition: getopt.c:53
void list_free(List *list)
Definition: list.c:1133
int i
const char * strerror(int errnum)
Definition: strerror.c:19
static void sigusr1_handler(SIGNAL_ARGS)
Definition: postmaster.c:4956
void pgstat_init(void)
Definition: pgstat.c:355
void srandom(unsigned int seed)
Definition: srandom.c:22
int Log_destination
Definition: elog.c:106
char ** environ
#define elog
Definition: elog.h:219
CommandDest whereToSendOutput
Definition: postgres.c:88
static void static void status(const char *fmt,...) pg_attribute_printf(1
Definition: pg_regress.c:224
#define SIGCHLD
Definition: win32.h:198
static int SendStop
Definition: postmaster.c:230
void process_shared_preload_libraries(void)
Definition: miscinit.c:1478
Definition: pg_list.h:45
#define MAXLISTEN
Definition: postmaster.c:214
#define SIGALRM
Definition: win32.h:194
static struct timeval random_start_time
Definition: postmaster.c:371
MemoryContext PostmasterContext
Definition: mcxt.c:45
#define SIGUSR2
Definition: win32.h:203
static void maybe_start_bgworkers(void)
Definition: postmaster.c:5740
void InitializeGUCOptions(void)
Definition: guc.c:4467
bool PostmasterMarkPIDForWorkerNotify ( int  )

Definition at line 5850 of file postmaster.c.

References bkend::bgworker_notify, dlist_iter::cur, dlist_container, dlist_foreach, and bkend::pid.

Referenced by BackgroundWorkerStateChange().

5851 {
5852  dlist_iter iter;
5853  Backend *bp;
5854 
5855  dlist_foreach(iter, &BackendList)
5856  {
5857  bp = dlist_container(Backend, elem, iter.cur);
5858  if (bp->pid == pid)
5859  {
5860  bp->bgworker_notify = true;
5861  return true;
5862  }
5863  }
5864  return false;
5865 }
#define dlist_foreach(iter, lhead)
Definition: ilist.h:507
bool bgworker_notify
Definition: postmaster.c:179
#define dlist_container(type, membername, ptr)
Definition: ilist.h:477
static dlist_head BackendList
Definition: postmaster.c:183
dlist_node * cur
Definition: ilist.h:161
pid_t pid
Definition: postmaster.c:168

Variable Documentation

int AuthenticationTimeout

Definition at line 236 of file postmaster.c.

Referenced by BackendInitialize(), and PerformAuthentication().

char* bonjour_name

Definition at line 243 of file postmaster.c.

Referenced by PostmasterMain().

bool enable_bonjour

Definition at line 242 of file postmaster.c.

Referenced by PostmasterMain().

bool EnableSSL

Definition at line 233 of file postmaster.c.

Referenced by parse_hba_line(), PostmasterMain(), and SIGHUP_handler().

char* ListenAddresses

Definition at line 200 of file postmaster.c.

Referenced by PostmasterMain().

bool Log_connections

Definition at line 239 of file postmaster.c.

Referenced by BackendInitialize(), and PerformAuthentication().

bool log_hostname

Definition at line 238 of file postmaster.c.

Referenced by BackendInitialize().

int postmaster_alive_fds[2]
int PostPortNumber

Definition at line 194 of file postmaster.c.

Referenced by CreateLockFile(), PostmasterMain(), and PostmasterStateMachine().

int PreAuthDelay

Definition at line 235 of file postmaster.c.

Referenced by BackendInitialize().

const char* progname

Definition at line 37 of file pg_standby.c.

Referenced by _check_database_version(), _CloseArchive(), _connectDB(), AuxiliaryProcessMain(), BackendRun(), BaseBackup(), CheckCopyStreamStop(), checkDataDir(), CheckServerVersionForStreaming(), cleanup_directories_atexit(), CleanupPriorWALFiles(), close_destination_dir(), close_walfile(), connectDatabase(), ConnectDatabase(), CopyStreamPoll(), CopyStreamReceive(), CreateReplicationSlot(), CustomizableCleanupPriorWALFiles(), CustomizableInitialize(), dir_close(), dir_finish(), dir_open_for_write(), doConnect(), DropReplicationSlot(), escape_quotes(), FindStreamingStart(), GenerateRecoveryConf(), get_destination_dir(), get_opts(), get_progname(), GetConnection(), HandleCopyStream(), HandleEndOfCopyStream(), init_parallel_dump_utils(), Initialize(), LogStreamerMain(), main(), mark_file_as_archived(), open_walfile(), OutputFsync(), parse_max_rate(), PostgresMain(), PostmasterMain(), prepareToTerminate(), process_postgres_switches(), ProcessKeepaliveMsg(), ProcessXLogDataMsg(), reached_end_position(), ReadEndOfStreamingResult(), ReceiveAndUnpackTarFile(), ReceiveTarFile(), ReceiveXlogStream(), RunIdentifySystem(), sendFeedback(), set_dump_section(), SetWALFileNameForCleanup(), sigTermHandler(), StartLogStreamer(), stop_streaming(), StreamLog(), StreamLogicalLog(), syncTargetDirectory(), tablespace_list_append(), tar_finish(), usage(), verify_dir_is_empty_or_create(), vwrite_msg(), walkdir(), WriteRecoveryConf(), writeTarData(), and writeTimeLineHistoryFile().

int ReservedBackends

Definition at line 211 of file postmaster.c.

Referenced by InitPostgres(), and PostmasterMain().

bool restart_after_crash

Definition at line 244 of file postmaster.c.

Referenced by PostmasterStateMachine().

char* Unix_socket_directories

Definition at line 197 of file postmaster.c.

Referenced by PostmasterMain().

char* Unix_socket_group

Definition at line 103 of file pqcomm.c.

int Unix_socket_permissions

Definition at line 102 of file pqcomm.c.

Referenced by show_unix_socket_permissions().