| mcr | f555c16 | 1999-10-07 23:47:09 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1997 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that: (1) source code distributions |
| 7 | * retain the above copyright notice and this paragraph in its entirety, (2) |
| 8 | * distributions including binary code include the above copyright notice and |
| 9 | * this paragraph in its entirety in the documentation or other materials |
| 10 | * provided with the distribution, and (3) all advertising materials mentioning |
| 11 | * features or use of this software display the following acknowledgement: |
| 12 | * ``This product includes software developed by the University of California, |
| 13 | * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| 14 | * the University nor the names of its contributors may be used to endorse |
| 15 | * or promote products derived from this software without specific prior |
| 16 | * written permission. |
| 17 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| 18 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| 19 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 20 | */ |
| 21 | |
| 22 | #ifndef lint |
| 23 | static const char rcsid[] = |
| fenner | b9ac23c | 1999-11-21 09:36:43 +0000 | [diff] [blame] | 24 | "@(#) $Header: /tcpdump/master/tcpdump/setsignal.c,v 1.5 1999-11-21 09:37:04 fenner Exp $ (LBL)"; |
| 25 | #endif |
| 26 | |
| 27 | #ifdef HAVE_CONFIG_H |
| 28 | #include "config.h" |
| mcr | f555c16 | 1999-10-07 23:47:09 +0000 | [diff] [blame] | 29 | #endif |
| 30 | |
| 31 | #include <sys/types.h> |
| 32 | |
| 33 | #ifdef HAVE_MEMORY_H |
| 34 | #include <memory.h> |
| 35 | #endif |
| 36 | #include <signal.h> |
| 37 | #ifdef HAVE_SIGACTION |
| 38 | #include <string.h> |
| 39 | #endif |
| 40 | |
| 41 | #include "gnuc.h" |
| 42 | #ifdef HAVE_OS_PROTO_H |
| 43 | #include "os-proto.h" |
| 44 | #endif |
| 45 | |
| 46 | #include "setsignal.h" |
| 47 | |
| 48 | /* |
| 49 | * An os independent signal() with BSD semantics, e.g. the signal |
| 50 | * catcher is restored following service of the signal. |
| 51 | * |
| 52 | * When sigset() is available, signal() has SYSV semantics and sigset() |
| 53 | * has BSD semantics and call interface. Unfortunately, Linux does not |
| 54 | * have sigset() so we use the more complicated sigaction() interface |
| 55 | * there. |
| 56 | * |
| 57 | * Did I mention that signals suck? |
| 58 | */ |
| 59 | RETSIGTYPE |
| 60 | (*setsignal (int sig, RETSIGTYPE (*func)(int)))(int) |
| 61 | { |
| 62 | #ifdef HAVE_SIGACTION |
| 63 | struct sigaction old, new; |
| 64 | |
| 65 | memset(&new, 0, sizeof(new)); |
| 66 | new.sa_handler = func; |
| 67 | #ifdef SA_RESTART |
| 68 | new.sa_flags |= SA_RESTART; |
| 69 | #endif |
| 70 | if (sigaction(sig, &new, &old) < 0) |
| 71 | return (SIG_ERR); |
| 72 | return (old.sa_handler); |
| 73 | |
| 74 | #else |
| 75 | #ifdef HAVE_SIGSET |
| 76 | return (sigset(sig, func)); |
| 77 | #else |
| 78 | return (signal(sig, func)); |
| 79 | #endif |
| 80 | #endif |
| 81 | } |
| 82 | |
