/*

  Simple DirectMedia Layer

  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied

  warranty.  In no event will the authors be held liable for any damages

  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,

  including commercial applications, and to alter it and redistribute it

  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not

     claim that you wrote the original software. If you use this software

     in a product, an acknowledgment in the product documentation would be

     appreciated but is not required.

  2. Altered source versions must be plainly marked as such, and must not be

     misrepresented as being the original software.

  3. This notice may not be removed or altered from any source distribution.

*/

#include "SDL_config.h"

/* General fatal signal handling code for SDL */

#ifdef HAVE_SIGNAL_H

#include <signal.h>

#include "SDL.h"

#include "SDL_fatal.h"

/* This installs some signal handlers for the more common fatal signals,

   so that if the programmer is lazy, the app doesn't die so horribly if

   the program crashes.

*/

static void

SDL_Parachute(int sig)

{

    signal(sig, SIG_DFL);

    SDL_Quit();

    raise(sig);

}

static const int SDL_fatal_signals[] = {

    SIGSEGV,

#ifdef SIGBUS

    SIGBUS,

#endif

#ifdef SIGFPE

    SIGFPE,

#endif

#ifdef SIGQUIT

    SIGQUIT,

#endif

    0

};

void

SDL_InstallParachute(void)

{

    /* Set a handler for any fatal signal not already handled */

    int i;

#ifdef HAVE_SIGACTION

    struct sigaction action;

    for (i = 0; SDL_fatal_signals[i]; ++i) {

        sigaction(SDL_fatal_signals[i], NULL, &action);

        if (action.sa_handler == SIG_DFL) {

            action.sa_handler = SDL_Parachute;

            sigaction(SDL_fatal_signals[i], &action, NULL);

        }

    }

#ifdef SIGALRM

    /* Set SIGALRM to be ignored -- necessary on Solaris */

    sigaction(SIGALRM, NULL, &action);

    if (action.sa_handler == SIG_DFL) {

        action.sa_handler = SIG_IGN;

        sigaction(SIGALRM, &action, NULL);

    }

#endif

#else

    void (*ohandler) (int);

    for (i = 0; SDL_fatal_signals[i]; ++i) {

        ohandler = signal(SDL_fatal_signals[i], SDL_Parachute);

        if (ohandler != SIG_DFL) {

            signal(SDL_fatal_signals[i], ohandler);

        }

    }

#endif /* HAVE_SIGACTION */

    return;

}

void

SDL_UninstallParachute(void)

{

    /* Remove a handler for any fatal signal handled */

    int i;

#ifdef HAVE_SIGACTION

    struct sigaction action;

    for (i = 0; SDL_fatal_signals[i]; ++i) {

        sigaction(SDL_fatal_signals[i], NULL, &action);

        if (action.sa_handler == SDL_Parachute) {

            action.sa_handler = SIG_DFL;

            sigaction(SDL_fatal_signals[i], &action, NULL);

        }

    }

#else

    void (*ohandler) (int);

    for (i = 0; SDL_fatal_signals[i]; ++i) {

        ohandler = signal(SDL_fatal_signals[i], SIG_DFL);

        if (ohandler != SDL_Parachute) {

            signal(SDL_fatal_signals[i], ohandler);

        }

    }

#endif /* HAVE_SIGACTION */

}

#else

/* No signals on this platform, nothing to do.. */

void

SDL_InstallParachute(void)

{

    return;

}

void

SDL_UninstallParachute(void)

{

    return;

}

#endif /* HAVE_SIGNAL_H */

/* vi: set ts=4 sw=4 expandtab: */