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/*-------------------------------------------------------------------------
*
* pqsignal.c
* reliable BSD-style signal(2) routine stolen from RWW who stole it
* from Stevens...
*
* Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/interfaces/libpq/pqsignal.c,v 1.23 2004/08/29 05:07:00 momjian Exp $
*
* NOTES
* This shouldn't be in libpq, but the monitor and some other
* things need it...
*
*-------------------------------------------------------------------------
*/
#include "pqsignal.h"
#include <signal.h>
pqsigfunc
pqsignal(int signo, pqsigfunc func)
{
#if !defined(HAVE_POSIX_SIGNALS)
return signal(signo, func);
#else
struct sigaction act,
oact;
act.sa_handler = func;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
if (signo != SIGALRM)
act.sa_flags |= SA_RESTART;
#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;
#endif /* !HAVE_POSIX_SIGNALS */
}
pqsigfunc
pqsignalinquire(int signo)
{
#ifndef WIN32
#if !defined(HAVE_POSIX_SIGNALS)
pqsigfunc old_sigfunc;
int old_sigmask;
/* Prevent signal handler calls during test */
old_sigmask = sigblock(sigmask(signo));
old_sigfunc = signal(signo, SIG_DFL);
signal(signo, old_sigfunc);
sigblock(old_sigmask);
return old_sigfunc;
#else
struct sigaction oact;
if (sigaction(signo, NULL, &oact) < 0)
return SIG_ERR;
return oact.sa_handler;
#endif /* !HAVE_POSIX_SIGNALS */
#else
return SIG_DFL;
#endif
}
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