emulated/bsd_signal.c

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*
  25  * bsd_signal() function, per POIX 1003.1-2003
  26  */
  27 #include <sys/signal.h>
  28
  29 void
  30 (*bsd_signal(int sig, void (*func)(int)))(int)
  31 {
  32     struct sigaction act, oact;
  33
  34
  35     act.sa_handler = func;
  36     act.sa_flags = SA_RESTART;
  37
  38     sigemptyset(&act.sa_mask);
  39     sigaddset(&act.sa_mask, sig);
  40     if (sigaction(sig, &act, &oact) == -1)
  41         return(SIG_ERR);
  42
  43     return(oact.sa_handler);
  44 }