/* $OpenBSD: setsignal.c,v 1.3 2007/10/07 16:41:05 deraadt Exp $ */ /* * 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[] = "@(#) $Id: setsignal.c,v 1.3 2007/10/07 16:41:05 deraadt Exp $ (LBL)"; #endif #include #ifdef HAVE_MEMORY_H #include #endif #include #ifdef HAVE_SIGACTION #include #endif #include "gnuc.h" #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 }