sys.subproj/sigprocmask.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 /*      @(#)sigprocmask.c       1.0     9/26/95 (c) 1995 NeXT   */
  23
  24 #include <sys/syscall.h>
  25 #include <signal.h>
  26 #include <sys/signal.h>
  27 #include <errno.h>
  28
  29 /*
  30  *      Translate sigprocmask call to system call interface.
  31  */
  32
  33 int   sigprocmask (
  34         int how,
  35         const sigset_t *nsm,
  36         sigset_t *osm)
  37 {
  38     sigset_t    mask;
  39
  40     if (nsm == 0) {
  41         how = SIG_BLOCK;
  42         sigemptyset(&mask);
  43     } else {
  44         mask = *nsm;
  45     }
  46     mask = (sigset_t) syscall(SYS_sigprocmask, how, mask);
  47     /* syscall will call cerror if there is an error */
  48     if (osm)
  49         *osm = mask;
  50     return 0;
  51 }