/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    This 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.

    This 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 this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#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 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 */