sysdeps/posix/sigsuspend.c

   1 /* Copyright (C) 1991-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <signal.h>
  20 #include <stddef.h>
  21 #include <unistd.h>
  22
  23
  24 /* Change the set of blocked signals to SET,
  25    wait until a signal arrives, and restore the set of blocked signals.  */
  26 int
  27 __sigsuspend (set)
  28      const sigset_t *set;
  29 {
  30   sigset_t oset;
  31   int save;
  32
  33   if (set == NULL)
  34     {
  35       __set_errno (EINVAL);
  36       return -1;
  37     }
  38
  39   if (sigprocmask (SIG_SETMASK, set, &oset) < 0)
  40     return -1;
  41
  42   (void) pause();
  43   save = errno;
  44
  45   if (sigprocmask (SIG_SETMASK, &oset, (sigset_t *) NULL) < 0)
  46     return -1;
  47
  48   __set_errno (save);
  49   return -1;
  50 }
  51 libc_hidden_def (__sigsuspend)
  52 weak_alias (__sigsuspend, sigsuspend)