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root/usr/lib/posix/signal/sigprocmask.c

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DEFINITIONS

This source file includes following definitions.
  1. sigprocmask

   1 /*
   2  * Copyright (c) 2005, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 
  30 #include <sys/signal.h>
  31 
  32 #include <stddef.h>
  33 #include <signal.h>
  34 #include <errno.h>
  35 
  36 int
  37 sigprocmask(int how, const sigset_t *set, sigset_t *oldset)
  38 {
  39         sigset_t newset = 0;
  40 
  41         if (set != NULL)
  42                 newset = *set;
  43 
  44         SIGNAL_LOCK();
  45 
  46         if (oldset != NULL)
  47                 *oldset = __sig_mask;
  48 
  49         if (set != NULL) {
  50                 switch (how) {
  51                 case SIG_BLOCK:
  52                         __sig_mask |= newset;
  53                         break;
  54                 case SIG_UNBLOCK:
  55                         __sig_mask &= ~newset;
  56                         break;
  57                 case SIG_SETMASK:
  58                         __sig_mask = newset;
  59                         break;
  60                 default:
  61                         SIGNAL_UNLOCK();
  62                         errno = EINVAL;
  63                         return -1;
  64                 }
  65         }
  66         __sig_mask &= ~(sigmask(SIGSTOP) | sigmask(SIGKILL));
  67 
  68         SIGNAL_UNLOCK();
  69 
  70         /* Process pending signal */
  71         __sig_flush();
  72 
  73         return 0;
  74 }

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