/*

  Simple DirectMedia Layer

  Copyright (C) 1997-2015 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_internal.h"

#include "SDL_hints.h"

#include "SDL_assert.h"

/* General quit handling code for SDL */

#ifdef HAVE_SIGNAL_H

#include <signal.h>

#endif

#include "SDL_events.h"

#include "SDL_events_c.h"

static SDL_bool disable_signals = SDL_FALSE;

static SDL_bool send_quit_pending = SDL_FALSE;

#ifdef HAVE_SIGNAL_H

static void

SDL_HandleSIG(int sig)

{

    /* Reset the signal handler */

    signal(sig, SDL_HandleSIG);

    /* Send a quit event next time the event loop pumps. */

    /* We can't send it in signal handler; malloc() might be interrupted! */

    send_quit_pending = SDL_TRUE;

}

#endif /* HAVE_SIGNAL_H */

/* Public functions */

static int

SDL_QuitInit_Internal(void)

{

#ifdef HAVE_SIGACTION

    struct sigaction action;

    sigaction(SIGINT, NULL, &action);

#ifdef HAVE_SA_SIGACTION

    if ( action.sa_handler == SIG_DFL && action.sa_sigaction == (void*)SIG_DFL ) {

#else

    if ( action.sa_handler == SIG_DFL ) {

#endif

        action.sa_handler = SDL_HandleSIG;

        sigaction(SIGINT, &action, NULL);

    }

    sigaction(SIGTERM, NULL, &action);

#ifdef HAVE_SA_SIGACTION

    if ( action.sa_handler == SIG_DFL && action.sa_sigaction == (void*)SIG_DFL ) {

#else

    if ( action.sa_handler == SIG_DFL ) {

#endif

        action.sa_handler = SDL_HandleSIG;

        sigaction(SIGTERM, &action, NULL);

    }

#elif HAVE_SIGNAL_H

    void (*ohandler) (int);

    /* Both SIGINT and SIGTERM are translated into quit interrupts */

    ohandler = signal(SIGINT, SDL_HandleSIG);

    if (ohandler != SIG_DFL)

        signal(SIGINT, ohandler);

    ohandler = signal(SIGTERM, SDL_HandleSIG);

    if (ohandler != SIG_DFL)

        signal(SIGTERM, ohandler);

#endif /* HAVE_SIGNAL_H */

    /* That's it! */

    return 0;

}

int

SDL_QuitInit(void)

{

    const char *hint = SDL_GetHint(SDL_HINT_NO_SIGNAL_HANDLERS);

    disable_signals = hint && (SDL_atoi(hint) == 1);

    if (!disable_signals) {

        return SDL_QuitInit_Internal();

    }

    return 0;

}

static void

SDL_QuitQuit_Internal(void)

{

#ifdef HAVE_SIGACTION

    struct sigaction action;

    sigaction(SIGINT, NULL, &action);

    if ( action.sa_handler == SDL_HandleSIG ) {

        action.sa_handler = SIG_DFL;

        sigaction(SIGINT, &action, NULL);

    }

    sigaction(SIGTERM, NULL, &action);

    if ( action.sa_handler == SDL_HandleSIG ) {

        action.sa_handler = SIG_DFL;

        sigaction(SIGTERM, &action, NULL);

    }

#elif HAVE_SIGNAL_H

    void (*ohandler) (int);

    ohandler = signal(SIGINT, SIG_DFL);

    if (ohandler != SDL_HandleSIG)

        signal(SIGINT, ohandler);

    ohandler = signal(SIGTERM, SIG_DFL);

    if (ohandler != SDL_HandleSIG)

        signal(SIGTERM, ohandler);

#endif /* HAVE_SIGNAL_H */

}

void

SDL_QuitQuit(void)

{

    if (!disable_signals) {

        SDL_QuitQuit_Internal();

    }

}

/* This function returns 1 if it's okay to close the application window */

int

SDL_SendQuit(void)

{

    send_quit_pending = SDL_FALSE;

    return SDL_SendAppEvent(SDL_QUIT);

}

void

SDL_SendPendingQuit(void)

{

    if (send_quit_pending) {

        SDL_SendQuit();

        SDL_assert(!send_quit_pending);

    }

}

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