83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/*
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* Copyright (c) 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/setsignal.c,v 1.5 1999/11/21 09:37:04 fenner Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/types.h>
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#ifdef HAVE_MEMORY_H
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#include <memory.h>
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#endif
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#include <signal.h>
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#ifdef HAVE_SIGACTION
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#include <string.h>
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#endif
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#include "gnuc.h"
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#ifdef HAVE_OS_PROTO_H
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#include "os-proto.h"
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#endif
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#include "setsignal.h"
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/*
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* An os independent signal() with BSD semantics, e.g. the signal
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* catcher is restored following service of the signal.
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*
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* When sigset() is available, signal() has SYSV semantics and sigset()
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* has BSD semantics and call interface. Unfortunately, Linux does not
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* have sigset() so we use the more complicated sigaction() interface
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* there.
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*
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* Did I mention that signals suck?
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*/
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RETSIGTYPE
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(*setsignal (int sig, RETSIGTYPE (*func)(int)))(int)
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{
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#ifdef HAVE_SIGACTION
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struct sigaction old, new;
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memset(&new, 0, sizeof(new));
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new.sa_handler = func;
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#ifdef SA_RESTART
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new.sa_flags |= SA_RESTART;
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#endif
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if (sigaction(sig, &new, &old) < 0)
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return (SIG_ERR);
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return (old.sa_handler);
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#else
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#ifdef HAVE_SIGSET
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return (sigset(sig, func));
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#else
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return (signal(sig, func));
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#endif
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#endif
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}
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