emulated/bsd_signal.c

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26 /*
  27  * bsd_signal() function, per POIX 1003.1-2003
  28  */
  29 #include <sys/signal.h>
  30
  31 void
  32 (*bsd_signal(int sig, void (*func)(int)))(int)
  33 {
  34     struct sigaction act, oact;
  35
  36
  37     act.sa_handler = func;
  38     act.sa_flags = SA_RESTART;
  39
  40     sigemptyset(&act.sa_mask);
  41     sigaddset(&act.sa_mask, sig);
  42     if (sigaction(sig, &act, &oact) == -1)
  43         return(SIG_ERR);
  44
  45     return(oact.sa_handler);
  46 }