src/events/SDL_quit.c
author Patrice Mandin <patmandin@gmail.com>
Thu, 14 Jul 2011 15:40:07 +0200
branchSDL-1.2
changeset 5565 4225f09eb8cb
parent 5500 27348c0ae529
child 6137 4720145f848b
permissions -rw-r--r--
Check sa_sigaction member of struct sigaction
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2009 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 #include "SDL_config.h"
    23 
    24 /* General quit handling code for SDL */
    25 
    26 #ifdef HAVE_SIGNAL_H
    27 #include <signal.h>
    28 #endif
    29 
    30 #include "SDL_events.h"
    31 #include "SDL_events_c.h"
    32 
    33 
    34 #ifdef HAVE_SIGNAL_H
    35 static void SDL_HandleSIG(int sig)
    36 {
    37 	/* Reset the signal handler */
    38 	signal(sig, SDL_HandleSIG);
    39 
    40 	/* Signal a quit interrupt */
    41 	SDL_PrivateQuit();
    42 }
    43 #endif /* HAVE_SIGNAL_H */
    44 
    45 /* Public functions */
    46 int SDL_QuitInit(void)
    47 {
    48 #ifdef HAVE_SIGACTION
    49 	struct sigaction action;
    50 	sigaction(SIGINT, NULL, &action);
    51 #  ifdef HAVE_SA_SIGACTION
    52 	if ( action.sa_handler == SIG_DFL && action.sa_sigaction == (void*)SIG_DFL ) {
    53 #  else
    54 	if ( action.sa_handler == SIG_DFL ) {
    55 #  endif
    56 		action.sa_handler = SDL_HandleSIG;
    57 		sigaction(SIGINT, &action, NULL);
    58 	}
    59 	sigaction(SIGTERM, NULL, &action);
    60 #  ifdef HAVE_SA_SIGACTION
    61 	if ( action.sa_handler == SIG_DFL && action.sa_sigaction == (void*)SIG_DFL ) {
    62 #  else
    63 	if ( action.sa_handler == SIG_DFL ) {
    64 #  endif
    65 		action.sa_handler = SDL_HandleSIG;
    66 		sigaction(SIGTERM, &action, NULL);
    67 	}
    68 #elif HAVE_SIGNAL_H
    69 	void (*ohandler)(int);
    70 
    71 	/* Both SIGINT and SIGTERM are translated into quit interrupts */
    72 	ohandler = signal(SIGINT, SDL_HandleSIG);
    73 	if ( ohandler != SIG_DFL )
    74 		signal(SIGINT, ohandler);
    75 	ohandler = signal(SIGTERM, SDL_HandleSIG);
    76 	if ( ohandler != SIG_DFL )
    77 		signal(SIGTERM, ohandler);
    78 #endif /* HAVE_SIGNAL_H */
    79 
    80 	/* That's it! */
    81 	return(0);
    82 }
    83 void SDL_QuitQuit(void)
    84 {
    85 #ifdef HAVE_SIGACTION
    86 	struct sigaction action;
    87 	sigaction(SIGINT, NULL, &action);
    88 	if ( action.sa_handler == SDL_HandleSIG ) {
    89 		action.sa_handler = SIG_DFL;
    90 		sigaction(SIGINT, &action, NULL);
    91 	}
    92 	sigaction(SIGTERM, NULL, &action);
    93 	if ( action.sa_handler == SDL_HandleSIG ) {
    94 		action.sa_handler = SIG_DFL;
    95 		sigaction(SIGTERM, &action, NULL);
    96 	}
    97 #elif HAVE_SIGNAL_H
    98 	void (*ohandler)(int);
    99 
   100 	ohandler = signal(SIGINT, SIG_DFL);
   101 	if ( ohandler != SDL_HandleSIG )
   102 		signal(SIGINT, ohandler);
   103 	ohandler = signal(SIGTERM, SIG_DFL);
   104 	if ( ohandler != SDL_HandleSIG )
   105 		signal(SIGTERM, ohandler);
   106 #endif /* HAVE_SIGNAL_H */
   107 }
   108 
   109 /* This function returns 1 if it's okay to close the application window */
   110 int SDL_PrivateQuit(void)
   111 {
   112 	int posted;
   113 
   114 	posted = 0;
   115 	if ( SDL_ProcessEvents[SDL_QUIT] == SDL_ENABLE ) {
   116 		SDL_Event event;
   117 		event.type = SDL_QUIT;
   118 		if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
   119 			posted = 1;
   120 			SDL_PushEvent(&event);
   121 		}
   122 	}
   123 	return(posted);
   124 }