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events: Let arbitrary signals to simulate iOS/Android backgrounding events.

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This lets you build a custom embedded device that roughly offers the "this
process is going to the background NOW" semantics of SDL on a mobile device.
This commit is contained in:
Ryan C. Gordon
2019-03-15 15:51:05 -04:00
parent 911bf6241b
commit 8a5a05c168
6 changed files with 174 additions and 57 deletions
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2
src/events/SDL_events.c
View File

@@ -689,7 +689,7 @@ SDL_PumpEvents(void)
}
#endif
SDL_SendPendingQuit(); /* in case we had a signal handler fire, etc. */
SDL_SendPendingSignalEvents(); /* in case we had a signal handler fire, etc. */
}
/* Public functions */

2
src/events/SDL_events_c.h
View File

@@ -52,7 +52,7 @@ extern int SDL_SendQuit(void);
extern int SDL_EventsInit(void);
extern void SDL_EventsQuit(void);
extern void SDL_SendPendingQuit(void);
extern void SDL_SendPendingSignalEvents(void);
#endif /* SDL_events_c_h_ */

153
src/events/SDL_quit.c
View File

@@ -34,6 +34,14 @@
static SDL_bool disable_signals = SDL_FALSE;
static SDL_bool send_quit_pending = SDL_FALSE;
#ifdef SDL_BACKGROUNDING_SIGNAL
static SDL_bool send_backgrounding_pending = SDL_FALSE;
#endif
#ifdef SDL_FOREGROUNDING_SIGNAL
static SDL_bool send_foregrounding_pending = SDL_FALSE;
#endif
#ifdef HAVE_SIGNAL_H
static void
SDL_HandleSIG(int sig)
@@ -43,46 +51,81 @@ SDL_HandleSIG(int sig)
/* 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;
if ((sig == SIGINT) || (sig == SIGTERM)) {
send_quit_pending = SDL_TRUE;
}
#ifdef SDL_BACKGROUNDING_SIGNAL
else if (sig == SDL_BACKGROUNDING_SIGNAL) {
send_backgrounding_pending = SDL_TRUE;
}
#endif
#ifdef SDL_FOREGROUNDING_SIGNAL
else if (sig == SDL_FOREGROUNDING_SIGNAL) {
send_foregrounding_pending = SDL_TRUE;
}
#endif
}
#endif /* HAVE_SIGNAL_H */
static void
SDL_EventSignal_Init(const int sig)
{
#ifdef HAVE_SIGACTION
struct sigaction action;
sigaction(sig, NULL, &action);
#ifdef HAVE_SA_SIGACTION
if ( action.sa_handler == SIG_DFL && (void (*)(int))action.sa_sigaction == SIG_DFL ) {
#else
if ( action.sa_handler == SIG_DFL ) {
#endif
action.sa_handler = SDL_HandleSIG;
sigaction(sig, &action, NULL);
}
#elif HAVE_SIGNAL_H
void (*ohandler) (int) = signal(sig, SDL_HandleSIG);
if (ohandler != SIG_DFL) {
signal(sig, ohandler);
}
#endif
}
static void
SDL_EventSignal_Quit(const int sig)
{
#ifdef HAVE_SIGACTION
struct sigaction action;
sigaction(sig, NULL, &action);
if ( action.sa_handler == SDL_HandleSIG ) {
action.sa_handler = SIG_DFL;
sigaction(sig, &action, NULL);
}
#elif HAVE_SIGNAL_H
void (*ohandler) (int) = signal(sig, SIG_DFL);
if (ohandler != SDL_HandleSIG) {
signal(sig, ohandler);
}
#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 && (void (*)(int))action.sa_sigaction == 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 && (void (*)(int))action.sa_sigaction == 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 */
/* and SDL can be built to simulate iOS/Android semantics with arbitrary signals. */
SDL_EventSignal_Init(SIGINT);
SDL_EventSignal_Init(SIGTERM);
#ifdef SDL_BACKGROUNDING_SIGNAL
SDL_EventSignal_Init(SDL_BACKGROUNDING_SIGNAL);
#endif
#ifdef SDL_FOREGROUNDING_SIGNAL
SDL_EventSignal_Init(SDL_FOREGROUNDING_SIGNAL);
#endif
/* That's it! */
return 0;
@@ -100,28 +143,16 @@ SDL_QuitInit(void)
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);
SDL_EventSignal_Quit(SIGINT);
SDL_EventSignal_Quit(SIGTERM);
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 */
#ifdef SDL_BACKGROUNDING_SIGNAL
SDL_EventSignal_Quit(SDL_BACKGROUNDING_SIGNAL);
#endif
#ifdef SDL_FOREGROUNDING_SIGNAL
SDL_EventSignal_Quit(SDL_FOREGROUNDING_SIGNAL);
#endif
}
void
@@ -141,12 +172,26 @@ SDL_SendQuit(void)
}
void
SDL_SendPendingQuit(void)
SDL_SendPendingSignalEvents(void)
{
if (send_quit_pending) {
SDL_SendQuit();
SDL_assert(!send_quit_pending);
}
#ifdef SDL_BACKGROUNDING_SIGNAL
if (send_backgrounding_pending) {
send_backgrounding_pending = SDL_FALSE;
SDL_OnApplicationWillResignActive();
}
#endif
#ifdef SDL_FOREGROUNDING_SIGNAL
if (send_foregrounding_pending) {
send_foregrounding_pending = SDL_FALSE;
SDL_OnApplicationDidBecomeActive();
}
#endif
}
/* vi: set ts=4 sw=4 expandtab: */