sysdeps/unix/bsd/sigsuspend.c

   1 /* Copyright (C) 1991 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 #include <stddef.h>
  23 #include <unistd.h>
  24
  25
  26 /* Change the set of blocked signals to SET,
  27    wait until a signal arrives, and restore the set of blocked signals.  */
  28 int
  29 DEFUN(sigsuspend, (set), CONST sigset_t *set)
  30 {
  31   int mask;
  32   int sig;
  33
  34   if (set == NULL)
  35     {
  36       errno = EINVAL;
  37       return -1;
  38     }
  39
  40   mask = 0;
  41   for (sig = 1; sig <= NSIG; ++sig)
  42     if (__sigismember(set, sig))
  43       mask |= sigmask(sig);
  44
  45   return __sigpause(mask);
  46 }