sysdeps/unix/sysv/linux/sigwait.c

   1 /* Copyright (C) 1997-2018 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 <signal.h>
  19 #include <sysdep-cancel.h>
  20 #include <errno.h>
  21
  22 int
  23 __sigwait (const sigset_t *set, int *sig)
  24 {
  25   siginfo_t si;
  26   int ret;
  27   do
  28     ret = __sigtimedwait (set, &si, 0);
  29   /* Applications do not expect sigwait to return with EINTR, and the
  30      error code is not specified by POSIX.  */
  31   while (ret < 0 && errno == EINTR);
  32   if (ret < 0)
  33     return errno;
  34   *sig = si.si_signo;
  35   return 0;
  36 }
  37 libc_hidden_def (__sigwait)
  38 weak_alias (__sigwait, sigwait)
  39 strong_alias (__sigwait, __libc_sigwait)
  40
  41 /* __sigtimedwait handles cancellation.  */
  42 LIBC_CANCEL_HANDLED ();