sys/sigsuspend.c

   1 /*
   2  * Copyright (c) 1999 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 /*      @(#)sigsuspend.c        1.0     9/22/95 (c) 1995 NeXT   */
  24
  25 #include <signal.h>
  26 #include <unistd.h>
  27
  28 #ifdef VARIANT_CANCELABLE
  29 int __sigsuspend (const sigset_t);
  30 #else /* !VARIANT_CANCELABLE */
  31 int __sigsuspend_nocancel(const sigset_t);
  32 #endif /* VARIANT_CANCELABLE */
  33
  34 int
  35 sigsuspend (const sigset_t *sigmask_p)
  36 {
  37     sigset_t    mask;
  38
  39     if (sigmask_p)
  40         mask = *sigmask_p;
  41     else
  42         sigemptyset(&mask);
  43 #ifdef VARIANT_CANCELABLE
  44     return __sigsuspend(mask);
  45 #else /* !VARIANT_CANCELABLE */
  46     return __sigsuspend_nocancel(mask);
  47 #endif /* VARIANT_CANCELABLE */
  48 }
  49