sysdeps/unix/sysv/linux/sigsuspend.c

   1 /* Copyright (C) 1996-2012 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 <unistd.h>
  21
  22 #include <sysdep-cancel.h>
  23 #include <sys/syscall.h>
  24 #include <bp-checks.h>
  25
  26 #include <kernel-features.h>
  27
  28
  29 static inline int __attribute__ ((always_inline))
  30 do_sigsuspend (const sigset_t *set)
  31 {
  32   return INLINE_SYSCALL (rt_sigsuspend, 2, CHECK_SIGSET (set), _NSIG / 8);
  33 }
  34
  35 /* Change the set of blocked signals to SET,
  36    wait until a signal arrives, and restore the set of blocked signals.  */
  37 int
  38 __sigsuspend (set)
  39      const sigset_t *set;
  40 {
  41   if (SINGLE_THREAD_P)
  42     return do_sigsuspend (set);
  43
  44   int oldtype = LIBC_CANCEL_ASYNC ();
  45
  46   int result = do_sigsuspend (set);
  47
  48   LIBC_CANCEL_RESET (oldtype);
  49
  50   return result;
  51 }
  52 libc_hidden_def (__sigsuspend)
  53 weak_alias (__sigsuspend, sigsuspend)
  54 strong_alias (__sigsuspend, __libc_sigsuspend)
  55
  56 #ifndef NO_CANCELLATION
  57 int
  58 __sigsuspend_nocancel (set)
  59      const sigset_t *set;
  60 {
  61   return do_sigsuspend (set);
  62 }
  63 #endif