pqsignal.c File Reference

#include "postgres.h"
#include "libpq/pqsignal.h"

Include dependency graph for pqsignal.c:

Go to the source code of this file.

Functions
void	pqinitmask (void)
Variables
int	UnBlockSig
int	BlockSig
int	StartupBlockSig

---

Function Documentation

void pqinitmask

(

void

)

Definition at line 46 of file pqsignal.c.

References BlockSig, SIGABRT, SIGALRM, SIGCHLD, SIGCONT, sigdelset, SIGHUP, sigmask, SIGQUIT, SIGTRAP, SIGUSR1, SIGUSR2, SIGWINCH, StartupBlockSig, and UnBlockSig.

Referenced by PostgresMain(), and PostmasterMain().

{
#ifdef HAVE_SIGPROCMASK

    sigemptyset(&UnBlockSig);

    /* First set all signals, then clear some. */
    sigfillset(&BlockSig);
    sigfillset(&StartupBlockSig);

    /*
     * Unmark those signals that should never be blocked. Some of these signal
     * names don't exist on all platforms.  Most do, but might as well ifdef
     * them all for consistency...
     */
#ifdef SIGTRAP
    sigdelset(&BlockSig, SIGTRAP);
    sigdelset(&StartupBlockSig, SIGTRAP);
#endif
#ifdef SIGABRT
    sigdelset(&BlockSig, SIGABRT);
    sigdelset(&StartupBlockSig, SIGABRT);
#endif
#ifdef SIGILL
    sigdelset(&BlockSig, SIGILL);
    sigdelset(&StartupBlockSig, SIGILL);
#endif
#ifdef SIGFPE
    sigdelset(&BlockSig, SIGFPE);
    sigdelset(&StartupBlockSig, SIGFPE);
#endif
#ifdef SIGSEGV
    sigdelset(&BlockSig, SIGSEGV);
    sigdelset(&StartupBlockSig, SIGSEGV);
#endif
#ifdef SIGBUS
    sigdelset(&BlockSig, SIGBUS);
    sigdelset(&StartupBlockSig, SIGBUS);
#endif
#ifdef SIGSYS
    sigdelset(&BlockSig, SIGSYS);
    sigdelset(&StartupBlockSig, SIGSYS);
#endif
#ifdef SIGCONT
    sigdelset(&BlockSig, SIGCONT);
    sigdelset(&StartupBlockSig, SIGCONT);
#endif

/* Signals unique to startup */
#ifdef SIGQUIT
    sigdelset(&StartupBlockSig, SIGQUIT);
#endif
#ifdef SIGTERM
    sigdelset(&StartupBlockSig, SIGTERM);
#endif
#ifdef SIGALRM
    sigdelset(&StartupBlockSig, SIGALRM);
#endif
#else
    /* Set the signals we want. */
    UnBlockSig = 0;
    BlockSig = sigmask(SIGQUIT) |
        sigmask(SIGTERM) | sigmask(SIGALRM) |
    /* common signals between two */
        sigmask(SIGHUP) |
        sigmask(SIGINT) | sigmask(SIGUSR1) |
        sigmask(SIGUSR2) | sigmask(SIGCHLD) |
        sigmask(SIGWINCH) | sigmask(SIGFPE);
    StartupBlockSig = sigmask(SIGHUP) |
        sigmask(SIGINT) | sigmask(SIGUSR1) |
        sigmask(SIGUSR2) | sigmask(SIGCHLD) |
        sigmask(SIGWINCH) | sigmask(SIGFPE);
#endif
}

---

Variable Documentation

int BlockSig

Definition at line 26 of file pqsignal.c.

Referenced by BackendInitialize(), BackgroundWorkerBlockSignals(), BackgroundWriterMain(), bg_quickdie(), bgworker_die(), bgworker_quickdie(), CheckpointerMain(), chkpt_quickdie(), pmdie(), PostgresMain(), PostmasterMain(), pqinitmask(), quickdie(), reaper(), ServerLoop(), SIGHUP_handler(), sigusr1_handler(), startupproc_quickdie(), wal_quickdie(), WalRcvQuickDieHandler(), WalReceiverMain(), and WalWriterMain().

int StartupBlockSig

Definition at line 26 of file pqsignal.c.

Referenced by BackendInitialize(), and pqinitmask().

int UnBlockSig

Definition at line 26 of file pqsignal.c.

Referenced by AutoVacLauncherMain(), AutoVacWorkerMain(), BackgroundWorkerUnblockSignals(), BackgroundWriterMain(), bootstrap_signals(), CheckpointerMain(), PgArchiverMain(), PgstatCollectorMain(), pmdie(), PostgresMain(), pqinitmask(), reaper(), ServerLoop(), SIGHUP_handler(), sigusr1_handler(), StartupProcessMain(), SysLoggerMain(), WalReceiverMain(), and WalWriterMain().