sysdeps/unix/bsd/bsd4.4/kfreebsd/fbtl/sigwait.c

   1 /* Copyright (C) 1997-2013 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 #define __need_NULL
  21 #include <stddef.h>
  22 #include <string.h>
  23
  24 #include <sysdep-cancel.h>
  25 #include <sys/syscall.h>
  26 #include <fbtl/pthreadP.h>
  27
  28
  29 /* Return any pending signal or wait for one for the given time.  */
  30 static int
  31 do_sigwait (const sigset_t *set, int *sig)
  32 {
  33   int ret;
  34
  35 #ifdef SIGCANCEL
  36   sigset_t tmpset;
  37   if (set != NULL
  38       && (__builtin_expect (__sigismember (set, SIGCANCEL), 0)
  39 # ifdef SIGSETXID
  40           || __builtin_expect (__sigismember (set, SIGSETXID), 0)
  41 # endif
  42           ))
  43     {
  44       /* Create a temporary mask without the bit for SIGCANCEL set.  */
  45       tmpset = *set;
  46       __sigdelset (&tmpset, SIGCANCEL);
  47 # ifdef SIGSETXID
  48       __sigdelset (&tmpset, SIGSETXID);
  49 # endif
  50       set = &tmpset;
  51     }
  52 #endif
  53   do {
  54       ret = INLINE_SYSCALL (sigwait, 2, set, sig);
  55   } while (ret == EINTR);
  56
  57   return ret;
  58 }
  59
  60 int
  61 __sigwait (const sigset_t *set, int *sig)
  62 {
  63   if (SINGLE_THREAD_P)
  64     return do_sigwait (set, sig);
  65
  66   int oldtype = LIBC_CANCEL_ASYNC ();
  67
  68   int result = do_sigwait (set, sig);
  69
  70   LIBC_CANCEL_RESET (oldtype);
  71
  72   return result;
  73 }
  74 libc_hidden_def (__sigwait)
  75 weak_alias (__sigwait, sigwait)
  76 strong_alias (__sigwait, __libc_sigwait)