/*
 * Copyright 2002-2011, Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT license.
 *
 * Author:
 *              Daniel Reinhold, danielre@users.sf.net
 *              Ingo Weinhold, ingo_weinhold@gmx.de
 */


#include <signal.h>

#include <errno.h>
#include <stdio.h>

#include <symbol_versioning.h>

#include <errno_private.h>
#include <signal_private.h>


static __sighandler_t
signal_common(int signal, __sighandler_t signalHandler, int flags)
{
        struct sigaction newAction, oldAction;

        // setup the replacement sigaction
        newAction.sa_handler = signalHandler;
        newAction.sa_mask = 0;
        newAction.sa_flags = flags;

        if (__sigaction(signal, &newAction, &oldAction) != 0)
                return SIG_ERR;

        // success, return the original handler
        return oldAction.sa_handler;
}


__sighandler_t
__signal_beos(int signal, __sighandler_t signalHandler)
{
        // check signal range
        if (signal < 0 || signal > MAX_SIGNAL_NUMBER_BEOS) {
                __set_errno(EINVAL);
                return SIG_ERR;
        }

        // set the signal handler
        __sighandler_t result = signal_common(signal, signalHandler,
                SA_BEOS_COMPATIBLE_HANDLER);
        if (result == SIG_ERR)
                return SIG_ERR;

        // If the signal is SIGSEGV, set the same signal handler for SIGBUS. Those
        // constants had the same value under BeOS.
        if (signal == SIGSEGV)
                signal_common(SIGBUS, signalHandler, SA_BEOS_COMPATIBLE_HANDLER);

        return result;
}


__sighandler_t
__signal(int signal, __sighandler_t signalHandler)
{
        return signal_common(signal, signalHandler, 0);
}


DEFINE_LIBROOT_KERNEL_SYMBOL_VERSION("__signal_beos", "signal@", "BASE");

DEFINE_LIBROOT_KERNEL_SYMBOL_VERSION("__signal", "signal@@", "1_ALPHA4");