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Diffstat (limited to 'contrib/tcpdump/setsignal.c')
-rw-r--r-- | contrib/tcpdump/setsignal.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/contrib/tcpdump/setsignal.c b/contrib/tcpdump/setsignal.c new file mode 100644 index 000000000000..6f797ff83ceb --- /dev/null +++ b/contrib/tcpdump/setsignal.c @@ -0,0 +1,78 @@ +/* + * 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: setsignal.c,v 1.4 97/06/15 13:20:29 leres Exp $ (LBL)"; +#endif + +#include <sys/types.h> + +#ifdef HAVE_MEMORY_H +#include <memory.h> +#endif +#include <signal.h> +#ifdef HAVE_SIGACTION +#include <string.h> +#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 +} + |