SDL_quit.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2012 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* General quit handling code for SDL */
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#ifdef HAVE_SIGNAL_H
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#include <signal.h>
#endif
#include "SDL_events.h"
#include "SDL_events_c.h"
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#ifdef HAVE_SIGNAL_H
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static void SDL_HandleSIG(int sig)
{
/* Reset the signal handler */
signal(sig, SDL_HandleSIG);
/* Signal a quit interrupt */
SDL_PrivateQuit();
}
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#endif /* HAVE_SIGNAL_H */
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/* Public functions */
int SDL_QuitInit(void)
{
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#ifdef HAVE_SIGACTION
struct sigaction action;
sigaction(SIGINT, NULL, &action);
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# ifdef HAVE_SA_SIGACTION
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if ( action.sa_handler == SIG_DFL && action.sa_sigaction == (void*)SIG_DFL ) {
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# else
if ( action.sa_handler == SIG_DFL ) {
# endif
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action.sa_handler = SDL_HandleSIG;
sigaction(SIGINT, &action, NULL);
}
sigaction(SIGTERM, NULL, &action);
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# ifdef HAVE_SA_SIGACTION
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if ( action.sa_handler == SIG_DFL && action.sa_sigaction == (void*)SIG_DFL ) {
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# else
if ( action.sa_handler == SIG_DFL ) {
# endif
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action.sa_handler = SDL_HandleSIG;
sigaction(SIGTERM, &action, NULL);
}
#elif HAVE_SIGNAL_H
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void (*ohandler)(int);
/* Both SIGINT and SIGTERM are translated into quit interrupts */
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ohandler = signal(SIGINT, SDL_HandleSIG);
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if ( ohandler != SIG_DFL )
signal(SIGINT, ohandler);
ohandler = signal(SIGTERM, SDL_HandleSIG);
if ( ohandler != SIG_DFL )
signal(SIGTERM, ohandler);
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#endif /* HAVE_SIGNAL_H */
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/* That's it! */
return(0);
}
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void SDL_QuitQuit(void)
{
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#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
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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);
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#endif /* HAVE_SIGNAL_H */
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/* This function returns 1 if it's okay to close the application window */
int SDL_PrivateQuit(void)
{
int posted;
posted = 0;
if ( SDL_ProcessEvents[SDL_QUIT] == SDL_ENABLE ) {
SDL_Event event;
event.type = SDL_QUIT;
if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
posted = 1;
SDL_PushEvent(&event);
}
}
return(posted);
}