#include "postgres.h"
#include <signal.h>
#include <unistd.h>
#include "access/xlog.h"
#include "libpq/pqsignal.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "postmaster/startup.h"
#include "storage/ipc.h"
#include "storage/latch.h"
#include "storage/pmsignal.h"
#include "storage/standby.h"
#include "utils/guc.h"
#include "utils/timeout.h"

Include dependency graph for startup.c:

Functions
static void	startupproc_quickdie (SIGNAL_ARGS)

static void	StartupProcSigUsr1Handler (SIGNAL_ARGS)

static void	StartupProcTriggerHandler (SIGNAL_ARGS)

static void	StartupProcSigHupHandler (SIGNAL_ARGS)

static void	StartupProcShutdownHandler (SIGNAL_ARGS)

void	HandleStartupProcInterrupts (void)

void	StartupProcessMain (void)

void	PreRestoreCommand (void)

void	PostRestoreCommand (void)

bool	IsPromoteTriggered (void)

void	ResetPromoteTriggered (void)

Variables
static volatile sig_atomic_t	got_SIGHUP = false

static volatile sig_atomic_t	shutdown_requested = false

static volatile sig_atomic_t	promote_triggered = false

static volatile sig_atomic_t	in_restore_command = false

Function Documentation

void HandleStartupProcInterrupts ( void )

Definition at line 148 of file startup.c.

References got_SIGHUP, IsUnderPostmaster, PGC_SIGHUP, PostmasterIsAlive(), proc_exit(), ProcessConfigFile(), and shutdown_requested.

Referenced by recoveryApplyDelay(), recoveryPausesHere(), ShutdownWalRcv(), StartupXLOG(), and WaitForWALToBecomeAvailable().

 {
     /*
      * Check if we were requested to re-read config file.
      */
     if (got_SIGHUP)
     {
         got_SIGHUP = false;
         ProcessConfigFile(PGC_SIGHUP);
     }
 
     /*
      * Check if we were requested to exit without finishing recovery.
      */
     if (shutdown_requested)
         proc_exit(1);
 
     /*
      * Emergency bailout if postmaster has died.  This is to avoid the
      * necessity for manual cleanup of all postmaster children.
      */
     if (IsUnderPostmaster && !PostmasterIsAlive())
         exit(1);
 }

bool IsPromoteTriggered ( void )

Definition at line 247 of file startup.c.

References promote_triggered.

Referenced by CheckForStandbyTrigger().

 {
     return promote_triggered;
 }

void PostRestoreCommand ( void )

Definition at line 241 of file startup.c.

References in_restore_command.

Referenced by RestoreArchivedFile().

 {
     in_restore_command = false;
 }

void PreRestoreCommand ( void )

Definition at line 227 of file startup.c.

References in_restore_command, proc_exit(), and shutdown_requested.

Referenced by RestoreArchivedFile().

 {
     /*
      * Set in_restore_command to tell the signal handler that we should exit
      * right away on SIGTERM. We know that we're at a safe point to do that.
      * Check if we had already received the signal, so that we don't miss a
      * shutdown request received just before this.
      */
     in_restore_command = true;
     if (shutdown_requested)
         proc_exit(1);
 }

void ResetPromoteTriggered ( void )

Definition at line 253 of file startup.c.

References promote_triggered.

Referenced by CheckForStandbyTrigger().

 {
     promote_triggered = false;
 }

static void startupproc_quickdie ( SIGNAL_ARGS )

static

Definition at line 70 of file startup.c.

References BlockSig, on_exit_reset(), and PG_SETMASK.

Referenced by StartupProcessMain().

 {
     PG_SETMASK(&BlockSig);
 
     /*
      * We DO NOT want to run proc_exit() callbacks -- we're here because
      * shared memory may be corrupted, so we don't want to try to clean up our
      * transaction.  Just nail the windows shut and get out of town.  Now that
      * there's an atexit callback to prevent third-party code from breaking
      * things by calling exit() directly, we have to reset the callbacks
      * explicitly to make this work as intended.
      */
     on_exit_reset();
 
     /*
      * Note we do exit(2) not exit(0).  This is to force the postmaster into a
      * system reset cycle if some idiot DBA sends a manual SIGQUIT to a random
      * backend.  This is necessary precisely because we don't clean up our
      * shared memory state.  (The "dead man switch" mechanism in pmsignal.c
      * should ensure the postmaster sees this as a crash, too, but no harm in
      * being doubly sure.)
      */
     exit(2);
 }

void StartupProcessMain ( void )

Definition at line 179 of file startup.c.

References InitializeTimeouts(), PG_SETMASK, pqsignal(), proc_exit(), RegisterTimeout(), SIG_DFL, SIG_IGN, SIGCHLD, SIGCONT, SIGHUP, SIGPIPE, SIGQUIT, SIGTTIN, SIGTTOU, SIGUSR1, SIGUSR2, SIGWINCH, STANDBY_DEADLOCK_TIMEOUT, STANDBY_LOCK_TIMEOUT, STANDBY_TIMEOUT, StandbyDeadLockHandler(), StandbyLockTimeoutHandler(), StandbyTimeoutHandler(), startupproc_quickdie(), StartupProcShutdownHandler(), StartupProcSigHupHandler(), StartupProcSigUsr1Handler(), StartupProcTriggerHandler(), StartupXLOG(), and UnBlockSig.

Referenced by AuxiliaryProcessMain().

 {
     /*
      * Properly accept or ignore signals the postmaster might send us.
      */
     pqsignal(SIGHUP, StartupProcSigHupHandler); /* reload config file */
     pqsignal(SIGINT, SIG_IGN);  /* ignore query cancel */
     pqsignal(SIGTERM, StartupProcShutdownHandler);  /* request shutdown */
     pqsignal(SIGQUIT, startupproc_quickdie);    /* hard crash time */
     InitializeTimeouts();       /* establishes SIGALRM handler */
     pqsignal(SIGPIPE, SIG_IGN);
     pqsignal(SIGUSR1, StartupProcSigUsr1Handler);
     pqsignal(SIGUSR2, StartupProcTriggerHandler);
 
     /*
      * Reset some signals that are accepted by postmaster but not here
      */
     pqsignal(SIGCHLD, SIG_DFL);
     pqsignal(SIGTTIN, SIG_DFL);
     pqsignal(SIGTTOU, SIG_DFL);
     pqsignal(SIGCONT, SIG_DFL);
     pqsignal(SIGWINCH, SIG_DFL);
 
     /*
      * Register timeouts needed for standby mode
      */
     RegisterTimeout(STANDBY_DEADLOCK_TIMEOUT, StandbyDeadLockHandler);
     RegisterTimeout(STANDBY_TIMEOUT, StandbyTimeoutHandler);
     RegisterTimeout(STANDBY_LOCK_TIMEOUT, StandbyLockTimeoutHandler);
 
     /*
      * Unblock signals (they were blocked when the postmaster forked us)
      */
     PG_SETMASK(&UnBlockSig);
 
     /*
      * Do what we came for.
      */
     StartupXLOG();
 
     /*
      * Exit normally. Exit code 0 tells postmaster that we completed recovery
      * successfully.
      */
     proc_exit(0);
 }

static void StartupProcShutdownHandler ( SIGNAL_ARGS )

static

Definition at line 133 of file startup.c.

References in_restore_command, proc_exit(), shutdown_requested, and WakeupRecovery().

Referenced by StartupProcessMain().

 {
     int         save_errno = errno;
 
     if (in_restore_command)
         proc_exit(1);
     else
         shutdown_requested = true;
     WakeupRecovery();
 
     errno = save_errno;
 }

static void StartupProcSigHupHandler ( SIGNAL_ARGS )

static

Definition at line 121 of file startup.c.

References got_SIGHUP, and WakeupRecovery().

Referenced by StartupProcessMain().

 {
     int         save_errno = errno;
 
     got_SIGHUP = true;
     WakeupRecovery();
 
     errno = save_errno;
 }

static void StartupProcSigUsr1Handler ( SIGNAL_ARGS )

static

Definition at line 98 of file startup.c.

References latch_sigusr1_handler().

Referenced by StartupProcessMain().

 {
     int         save_errno = errno;
 
     latch_sigusr1_handler();
 
     errno = save_errno;
 }

static void StartupProcTriggerHandler ( SIGNAL_ARGS )

static

Definition at line 109 of file startup.c.

References promote_triggered, and WakeupRecovery().

Referenced by StartupProcessMain().

 {
     int         save_errno = errno;
 
     promote_triggered = true;
     WakeupRecovery();
 
     errno = save_errno;
 }

Variable Documentation

volatile sig_atomic_t got_SIGHUP = false

static

Definition at line 41 of file startup.c.

Referenced by HandleStartupProcInterrupts(), and StartupProcSigHupHandler().

volatile sig_atomic_t in_restore_command = false

static

Definition at line 49 of file startup.c.

Referenced by PostRestoreCommand(), PreRestoreCommand(), and StartupProcShutdownHandler().

volatile sig_atomic_t promote_triggered = false

static

Definition at line 43 of file startup.c.

Referenced by IsPromoteTriggered(), ResetPromoteTriggered(), and StartupProcTriggerHandler().

volatile sig_atomic_t shutdown_requested = false

static

Definition at line 42 of file startup.c.

Referenced by HandleStartupProcInterrupts(), PreRestoreCommand(), and StartupProcShutdownHandler().

Functions

Variables

Function Documentation

Variable Documentation