56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* legacy-pqsignal.c
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* reliable BSD-style signal(2) routine stolen from RWW who stole it
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* from Stevens...
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*
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* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/interfaces/libpq/legacy-pqsignal.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres_fe.h"
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#include <signal.h>
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/*
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* This version of pqsignal() exists only because pre-9.3 releases
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* of libpq exported pqsignal(), and some old client programs still
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* depend on that. (Since 9.3, clients are supposed to get it from
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* libpgport instead.)
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*
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* Because it is only intended for backwards compatibility, we freeze it
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* with the semantics it had in 9.2; in particular, this has different
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* behavior for SIGALRM than the version in src/port/pqsignal.c.
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*
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* libpq itself does not use this.
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*/
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pqsigfunc
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pqsignal(int signo, pqsigfunc func)
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{
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#ifndef WIN32
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struct sigaction act,
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oact;
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act.sa_handler = func;
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sigemptyset(&act.sa_mask);
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act.sa_flags = 0;
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if (signo != SIGALRM)
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act.sa_flags |= SA_RESTART;
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#ifdef SA_NOCLDSTOP
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if (signo == SIGCHLD)
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act.sa_flags |= SA_NOCLDSTOP;
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#endif
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if (sigaction(signo, &act, &oact) < 0)
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return SIG_ERR;
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return oact.sa_handler;
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#else /* WIN32 */
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return signal(signo, func);
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#endif
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}
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