/* BSD-like signal function.

   Copyright (C) 1991-2018 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

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <signal.h>

#include <sigsetops.h>

#include <internal-signals.h>

sigset_t _sigintr attribute_hidden;		/* Set by siginterrupt.  */

/* Set the handler for the signal SIG to HANDLER,

   returning the old handler, or SIG_ERR on error.  */

__sighandler_t

__bsd_signal (int sig, __sighandler_t handler)

{

  struct sigaction act, oact;

  /* Check signal extents to protect __sigismember.  */

  if (handler == SIG_ERR || sig < 1 || sig >= NSIG

      || __is_internal_signal (sig))

    {

      __set_errno (EINVAL);

      return SIG_ERR;

    }

  act.sa_handler = handler;

  __sigemptyset (&act.sa_mask);

  __sigaddset (&act.sa_mask, sig);

  act.sa_flags = __sigismember (&_sigintr, sig) ? 0 : SA_RESTART;

  if (__sigaction (sig, &act, &oact) < 0)

    return SIG_ERR;

  return oact.sa_handler;

}

weak_alias (__bsd_signal, bsd_signal)

weak_alias (__bsd_signal, signal)

weak_alias (__bsd_signal, ssignal)