libc/signal/sigpause.c

   1 /* Copyright (C) 1991,92,94-98,2000,2002,2003,2004
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <signal.h>
  20 #define __need_NULL
  21 #include <stddef.h>
  22 #include <cancel.h>
  23
  24 #include "sigset-cvt-mask.h"
  25
  26 /* Set the mask of blocked signals to MASK,
  27    wait for a signal to arrive, and then restore the mask.  */
  28 static int __sigpause (int sig_or_mask, int is_sig)
  29 {
  30   sigset_t set;
  31
  32   if (is_sig)
  33     {
  34       /* The modern X/Open implementation is requested.  */
  35       sigprocmask (SIG_BLOCK, NULL, &set);
  36       /* Bound-check sig_or_mask, remove it from the set.  */
  37       if (sigdelset (&set, sig_or_mask) < 0)
  38         return -1;
  39     }
  40   else
  41     sigset_set_old_mask (&set, sig_or_mask);
  42
  43   /* Note the sigpause() is a cancellation point.  But since we call
  44      sigsuspend() which itself is a cancellation point we do not have
  45      to do anything here.  */
  46   /* uClibc note: not true on uClibc, we call the non-cancellable version */
  47   return __NC(sigsuspend)(&set);
  48 }
  49
  50 int __bsd_sigpause(int mask);
  51 int __bsd_sigpause(int mask)
  52 {
  53         return __sigpause(mask, 0);
  54 }
  55
  56 /* We have to provide a default version of this function since the
  57    standards demand it.  The version which is a bit more reasonable is
  58    the BSD version.  So make this the default.  */
  59 static int __NC(sigpause)(int sig)
  60 {
  61         return __sigpause(sig, 1);
  62 }
  63 CANCELLABLE_SYSCALL(int, sigpause, (int sig), (sig))