glibc/sysdeps/unix/sysv/linux/sigtimedwait.c

/* Copyright (C) 1997-2020 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <signal.h>
#include <string.h>
#include <sysdep-cancel.h>

int
__sigtimedwait (const sigset_t *set, siginfo_t *info,
		const struct timespec *timeout)
{
  /* XXX The size argument hopefully will have to be changed to the
     real size of the user-level sigset_t.  */
  int result = SYSCALL_CANCEL (rt_sigtimedwait, set, info, timeout,
			       __NSIG_BYTES);

  /* The kernel generates a SI_TKILL code in si_code in case tkill is
     used.  tkill is transparently used in raise().  Since having
     SI_TKILL as a code is useful in general we fold the results
     here.  */
  if (result != -1 && info != NULL && info->si_code == SI_TKILL)
    info->si_code = SI_USER;

  return result;
}
libc_hidden_def (__sigtimedwait)
weak_alias (__sigtimedwait, sigtimedwait)