| /* |
| * 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[] = |
| "@(#) $Header: /tcpdump/master/tcpdump/setsignal.c,v 1.8 2002-08-01 08:53:35 risso Exp $ (LBL)"; |
| #endif |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <tcpdump-stdinc.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 |
| } |
| |