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)
pqsigfunc	pqsignal_pm (int signo, pqsigfunc func)

Variables
sigset_t	UnBlockSig
sigset_t	BlockSig
sigset_t	StartupBlockSig

Function Documentation

pqinitmask()

void pqinitmask

(

void

)

Definition at line 41 of file pqsignal.c.

References BlockSig, SIGABRT, SIGALRM, SIGCONT, SIGQUIT, SIGTRAP, StartupBlockSig, and UnBlockSig.

Referenced by BackendRun(), PostgresMain(), and PostmasterMain().

{
    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
}

pqsignal_pm()

pqsigfunc pqsignal_pm	(	int	signo,
		pqsigfunc	func
	)

Definition at line 118 of file pqsignal.c.

References BlockSig, pqsignal(), SIG_DFL, SIG_ERR, SIG_IGN, and SIGCHLD.

Referenced by PostmasterMain().

{
#ifndef WIN32
    struct sigaction act,
                oact;

    act.sa_handler = func;
    if (func == SIG_IGN || func == SIG_DFL)
    {
        /* in these cases, act the same as pqsignal() */
        sigemptyset(&act.sa_mask);
        act.sa_flags = SA_RESTART;
    }
    else
    {
        act.sa_mask = BlockSig;
        act.sa_flags = 0;
    }
#ifdef SA_NOCLDSTOP
    if (signo == SIGCHLD)
        act.sa_flags |= SA_NOCLDSTOP;
#endif
    if (sigaction(signo, &act, &oact) < 0)
        return SIG_ERR;
    return oact.sa_handler;
#else                           /* WIN32 */
    return pqsignal(signo, func);
#endif
}

Variable Documentation

BlockSig

sigset_t BlockSig

Definition at line 22 of file pqsignal.c.

Referenced by BackendInitialize(), BackendRun(), BackgroundWorkerBlockSignals(), BackgroundWriterMain(), bgworker_die(), CheckpointerMain(), pmdie(), PostgresMain(), PostmasterMain(), pqinitmask(), pqsignal_pm(), quickdie(), reaper(), ServerLoop(), SIGHUP_handler(), sigusr1_handler(), WalReceiverMain(), and WalWriterMain().

StartupBlockSig

sigset_t StartupBlockSig

Definition at line 22 of file pqsignal.c.

Referenced by BackendInitialize(), and pqinitmask().

UnBlockSig

sigset_t UnBlockSig

Definition at line 22 of file pqsignal.c.

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