sys.subproj/sigsuspend.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*      @(#)sigsuspend.c        1.0     9/22/95 (c) 1995 NeXT   */
  23
  24 #include <sys/signal.h>
  25 #include <sys/syscall.h>
  26 #include <unistd.h>
  27
  28 int
  29 sigsuspend (
  30             const sigset_t *sigmask_p
  31 )
  32 {
  33     sigset_t    mask;
  34
  35     if (sigmask_p)
  36         mask = *sigmask_p;
  37     else
  38         sigemptyset(&mask);
  39     return syscall (SYS_sigsuspend, mask);
  40 }
  41