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SDL_quit.c
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SDL_quit.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2011 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 quit handling code for SDL */
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#include "SDL_events.h"
#include "SDL_events_c.h"
#ifdef HAVE_SIGNAL_H
static void
SDL_HandleSIG(int sig)
{
/* Reset the signal handler */
signal(sig, SDL_HandleSIG);
/* Signal a quit interrupt */
SDL_SendQuit();
}
#endif /* HAVE_SIGNAL_H */
/* Public functions */
int
SDL_QuitInit(void)
{
#ifdef HAVE_SIGACTION
struct sigaction action;
sigaction(SIGINT, NULL, &action);
if ( action.sa_handler == SIG_DFL && action.sa_sigaction == SIG_DFL ) {
action.sa_handler = SDL_HandleSIG;
sigaction(SIGINT, &action, NULL);
}
sigaction(SIGTERM, NULL, &action);
if ( action.sa_handler == SIG_DFL && action.sa_sigaction == SIG_DFL ) {
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);
}
void
SDL_QuitQuit(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 */
}
/* This function returns 1 if it's okay to close the application window */
int
SDL_SendQuit(void)
{
int posted;
posted = 0;
if (SDL_GetEventState(SDL_QUIT) == SDL_ENABLE) {
SDL_Event event;
event.type = SDL_QUIT;
posted = (SDL_PushEvent(&event) > 0);
}
return (posted);
}
/* vi: set ts=4 sw=4 expandtab: */