sysdeps/posix/sigpause.c

   1 /* Copyright (C) 1991, 1992, 1994, 1995 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <signal.h>
  22
  23 /* Set the mask of blocked signals to MASK,
  24    wait for a signal to arrive, and then restore the mask.  */
  25 int
  26 DEFUN(__sigpause, (mask), int mask)
  27 {
  28   sigset_t set;
  29   int sig;
  30
  31   if (__sigemptyset (&set) < 0)
  32     return -1;
  33
  34   if (sizeof (mask) == sizeof (set))
  35     *(int *) &set = mask;
  36   else
  37     for (sig = 1; sig < NSIG; ++sig)
  38       if ((mask & sigmask(sig)) &&
  39           __sigaddset(&set, sig) < 0)
  40         return -1;
  41
  42   return sigsuspend (&set);
  43 }
  44
  45 weak_alias (__sigpause, sigpause)