sysdeps/posix/sigpause.c

   1 /* Copyright (C) 1991,92,94-98,2000,02 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <signal.h>
  21 #include <stddef.h>             /* For NULL.  */
  22
  23 #include <sigset-cvt-mask.h>
  24
  25 /* Set the mask of blocked signals to MASK,
  26    wait for a signal to arrive, and then restore the mask.  */
  27 int
  28 __sigpause (int sig_or_mask, int is_sig)
  29 {
  30   sigset_t set;
  31
  32   if (is_sig != 0)
  33     {
  34       /* The modern X/Open implementation is requested.  */
  35       if (__sigprocmask (0, NULL, &set) < 0
  36           /* Yes, we call `sigdelset' and not `__sigdelset'.  */
  37           || __sigdelset (&set, sig_or_mask) < 0)
  38         return -1;
  39     }
  40   else if (sigset_set_old_mask (&set, sig_or_mask) < 0)
  41     return -1;
  42
  43   return __sigsuspend (&set);
  44 }
  45 libc_hidden_def (__sigpause)
  46
  47 /* We have to provide a default version of this function since the
  48    standards demand it.  The version which is a bit more reasonable is
  49    the BSD version.  So make this the default.  */
  50 int
  51 __default_sigpause (int mask)
  52 {
  53   return __sigpause (mask, 0);
  54 }
  55 #undef sigpause
  56 weak_alias (__default_sigpause, sigpause)
  57
  58
  59 /* We have to provide a default version of this function since the
  60    standards demand it.  The version which is a bit more reasonable is
  61    the BSD version.  So make this the default.  */
  62 int
  63 __xpg_sigpause (int sig)
  64 {
  65   return __sigpause (sig, 1);
  66 }