startup.c File Reference

#include "postgres.h"
#include "access/xlog.h"
#include "libpq/pqsignal.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "postmaster/interrupt.h"
#include "postmaster/startup.h"
#include "storage/ipc.h"
#include "storage/latch.h"
#include "storage/pmsignal.h"
#include "storage/procsignal.h"
#include "storage/standby.h"
#include "utils/guc.h"
#include "utils/timeout.h"

Include dependency graph for startup.c:

Go to the source code of this file.

Functions
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

HandleStartupProcInterrupts()

void HandleStartupProcInterrupts

(

void

)

Definition at line 101 of file startup.c.

References got_SIGHUP, IsUnderPostmaster, PGC_SIGHUP, PostmasterIsAlive, proc_exit(), ProcessConfigFile(), ProcessProcSignalBarrier(), ProcSignalBarrierPending, 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);

    /* Process barrier events */
    if (ProcSignalBarrierPending)
        ProcessProcSignalBarrier();
}

IsPromoteTriggered()

bool IsPromoteTriggered

(

void

)

Definition at line 200 of file startup.c.

References promote_triggered.

Referenced by CheckForStandbyTrigger().

{
    return promote_triggered;
}

PostRestoreCommand()

void PostRestoreCommand

(

void

)

Definition at line 194 of file startup.c.

References in_restore_command.

Referenced by RestoreArchivedFile().

{
    in_restore_command = false;
}

PreRestoreCommand()

void PreRestoreCommand

(

void

)

Definition at line 180 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);
}

ResetPromoteTriggered()

void ResetPromoteTriggered

(

void

)

Definition at line 206 of file startup.c.

References promote_triggered.

Referenced by CheckForStandbyTrigger().

{
    promote_triggered = false;
}

StartupProcessMain()

void StartupProcessMain

(

void

)

Definition at line 136 of file startup.c.

References InitializeTimeouts(), PG_SETMASK, pqsignal(), proc_exit(), procsignal_sigusr1_handler(), RegisterTimeout(), SIG_DFL, SIG_IGN, SIGCHLD, SIGHUP, SignalHandlerForCrashExit(), SIGPIPE, SIGQUIT, SIGUSR1, SIGUSR2, STANDBY_DEADLOCK_TIMEOUT, STANDBY_LOCK_TIMEOUT, STANDBY_TIMEOUT, StandbyDeadLockHandler(), StandbyLockTimeoutHandler(), StandbyTimeoutHandler(), StartupProcShutdownHandler(), StartupProcSigHupHandler(), 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, SignalHandlerForCrashExit);
    InitializeTimeouts();       /* establishes SIGALRM handler */
    pqsignal(SIGPIPE, SIG_IGN);
    pqsignal(SIGUSR1, procsignal_sigusr1_handler);
    pqsignal(SIGUSR2, StartupProcTriggerHandler);

    /*
     * Reset some signals that are accepted by postmaster but not here
     */
    pqsignal(SIGCHLD, 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);
}

StartupProcShutdownHandler()

static void StartupProcShutdownHandler ( SIGNAL_ARGS  )

static

Definition at line 86 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;
}

StartupProcSigHupHandler()

static void StartupProcSigHupHandler ( SIGNAL_ARGS  )

static

Definition at line 74 of file startup.c.

References got_SIGHUP, and WakeupRecovery().

Referenced by StartupProcessMain().

{
    int         save_errno = errno;

    got_SIGHUP = true;
    WakeupRecovery();

    errno = save_errno;
}

StartupProcTriggerHandler()

static void StartupProcTriggerHandler ( SIGNAL_ARGS  )

static

Definition at line 62 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

got_SIGHUP

volatile sig_atomic_t got_SIGHUP = false

static

Definition at line 40 of file startup.c.

Referenced by HandleStartupProcInterrupts(), and StartupProcSigHupHandler().

in_restore_command

volatile sig_atomic_t in_restore_command = false

static

Definition at line 48 of file startup.c.

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

promote_triggered

volatile sig_atomic_t promote_triggered = false

static

Definition at line 42 of file startup.c.

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

shutdown_requested

volatile sig_atomic_t shutdown_requested = false

static

Definition at line 41 of file startup.c.

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