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/* Copyright (C) 1991, 1992, 1996, 1997 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 Library General Public License as

   published by the Free Software Foundation; either version 2 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

   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public

   License along with the GNU C Library; see the file COPYING.LIB.  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>

/* Tolerate non-threads versions of Posix */

#ifndef SA_ONESHOT

#define SA_ONESHOT 0

#endif

#ifndef SA_NOMASK

#define SA_NOMASK 0

#endif

#ifndef SA_INTERRUPT

#define SA_INTERRUPT 0

#endif

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

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

__sighandler_t __sysv_signal (int sig, __sighandler_t handler)

{

    struct sigaction act, oact;

    /* Check signal extents to protect __sigismember.  */

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

    {

        __set_errno (EINVAL);

        return SIG_ERR;

    }

    act.sa_handler = handler;

    if (__sigemptyset (&act.sa_mask) < 0)

        return SIG_ERR;

    act.sa_flags = SA_ONESHOT | SA_NOMASK | SA_INTERRUPT;

    act.sa_flags &= ~SA_RESTART;

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

        return SIG_ERR;

    return oact.sa_handler;

}

weak_alias (__sysv_signal, sysv_signal)