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/* BSD-like signal function.

   Copyright (C) 1991, 1992, 1996, 1997, 2000 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, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include <errno.h>

#include <signal.h>

#include <machine/weakalias.h>

sigset_t _sigintr;              /* 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 (sig, handler)

     int sig;

     __sighandler_t handler;

{

  struct sigaction act, oact;

  /* Check signal extents to protect __sigismember.  */

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

    {

      errno = (EINVAL);

      return SIG_ERR;

    }

  act.sa_handler = handler;

  if (sigemptyset (&act.sa_mask) < 0

      || sigaddset (&act.sa_mask, sig) < 0)

    return SIG_ERR;

  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)