1998-09-15 19:36:32 +00:00
|
|
|
/*
|
|
|
|
|
* Copyright (c) 1997
|
|
|
|
|
* The Regents of the University of California. All rights reserved.
|
|
|
|
|
*
|
|
|
|
|
* Redistribution and use in source and binary forms, with or without
|
|
|
|
|
* modification, are permitted provided that: (1) source code distributions
|
|
|
|
|
* retain the above copyright notice and this paragraph in its entirety, (2)
|
|
|
|
|
* distributions including binary code include the above copyright notice and
|
|
|
|
|
* this paragraph in its entirety in the documentation or other materials
|
|
|
|
|
* provided with the distribution, and (3) all advertising materials mentioning
|
|
|
|
|
* features or use of this software display the following acknowledgement:
|
|
|
|
|
* ``This product includes software developed by the University of California,
|
|
|
|
|
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
|
|
|
|
|
* the University nor the names of its contributors may be used to endorse
|
|
|
|
|
* or promote products derived from this software without specific prior
|
|
|
|
|
* written permission.
|
|
|
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
|
|
|
|
|
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
|
|
|
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#ifndef lint
|
|
|
|
|
static const char rcsid[] =
|
2001-04-03 07:45:48 +00:00
|
|
|
"@(#) $Header: /tcpdump/master/tcpdump/setsignal.c,v 1.7 2000/07/11 00:49:03 assar Exp $ (LBL)";
|
2000-01-30 00:45:58 +00:00
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
|
|
|
#include "config.h"
|
1998-09-15 19:36:32 +00:00
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#include <sys/types.h>
|
|
|
|
|
|
|
|
|
|
#include <signal.h>
|
|
|
|
|
#ifdef HAVE_SIGACTION
|
|
|
|
|
#include <string.h>
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#ifdef HAVE_OS_PROTO_H
|
|
|
|
|
#include "os-proto.h"
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#include "setsignal.h"
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* An os independent signal() with BSD semantics, e.g. the signal
|
|
|
|
|
* catcher is restored following service of the signal.
|
|
|
|
|
*
|
|
|
|
|
* When sigset() is available, signal() has SYSV semantics and sigset()
|
|
|
|
|
* has BSD semantics and call interface. Unfortunately, Linux does not
|
|
|
|
|
* have sigset() so we use the more complicated sigaction() interface
|
|
|
|
|
* there.
|
|
|
|
|
*
|
|
|
|
|
* Did I mention that signals suck?
|
|
|
|
|
*/
|
|
|
|
|
RETSIGTYPE
|
|
|
|
|
(*setsignal (int sig, RETSIGTYPE (*func)(int)))(int)
|
|
|
|
|
{
|
|
|
|
|
#ifdef HAVE_SIGACTION
|
|
|
|
|
struct sigaction old, new;
|
|
|
|
|
|
|
|
|
|
memset(&new, 0, sizeof(new));
|
|
|
|
|
new.sa_handler = func;
|
|
|
|
|
#ifdef SA_RESTART
|
|
|
|
|
new.sa_flags |= SA_RESTART;
|
|
|
|
|
#endif
|
|
|
|
|
if (sigaction(sig, &new, &old) < 0)
|
|
|
|
|
return (SIG_ERR);
|
|
|
|
|
return (old.sa_handler);
|
|
|
|
|
|
|
|
|
|
#else
|
|
|
|
|
#ifdef HAVE_SIGSET
|
|
|
|
|
return (sigset(sig, func));
|
|
|
|
|
#else
|
|
|
|
|
return (signal(sig, func));
|
|
|
|
|
#endif
|
|
|
|
|
#endif
|
|
|
|
|
}
|
|
|
|
|
|
