| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2019 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" |
| |
| #if defined(HAVE_SIGNAL_H) || defined(HAVE_SIGACTION) |
| #define HAVE_SIGNAL_SUPPORT 1 |
| #endif |
| |
| #ifdef HAVE_SIGNAL_SUPPORT |
| 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 |
| |
| 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! */ |
| 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 |
| } |
| |
| 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) |
| { |
| /* Both SIGINT and SIGTERM are translated into quit interrupts */ |
| /* 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; |
| } |
| |
| static void |
| SDL_QuitQuit_Internal(void) |
| { |
| SDL_EventSignal_Quit(SIGINT); |
| SDL_EventSignal_Quit(SIGTERM); |
| |
| #ifdef SDL_BACKGROUNDING_SIGNAL |
| SDL_EventSignal_Quit(SDL_BACKGROUNDING_SIGNAL); |
| #endif |
| |
| #ifdef SDL_FOREGROUNDING_SIGNAL |
| SDL_EventSignal_Quit(SDL_FOREGROUNDING_SIGNAL); |
| #endif |
| } |
| #endif |
| |
| int |
| SDL_QuitInit(void) |
| { |
| #ifdef HAVE_SIGNAL_SUPPORT |
| if (!SDL_GetHintBoolean(SDL_HINT_NO_SIGNAL_HANDLERS, SDL_FALSE)) { |
| return SDL_QuitInit_Internal(); |
| } |
| #endif |
| return 0; |
| } |
| |
| void |
| SDL_QuitQuit(void) |
| { |
| #ifdef HAVE_SIGNAL_SUPPORT |
| if (!disable_signals) { |
| SDL_QuitQuit_Internal(); |
| } |
| #endif |
| } |
| |
| void |
| SDL_SendPendingSignalEvents(void) |
| { |
| #ifdef HAVE_SIGNAL_SUPPORT |
| 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 |
| #endif |
| } |
| |
| /* This function returns 1 if it's okay to close the application window */ |
| int |
| SDL_SendQuit(void) |
| { |
| #ifdef HAVE_SIGNAL_SUPPORT |
| send_quit_pending = SDL_FALSE; |
| #endif |
| return SDL_SendAppEvent(SDL_QUIT); |
| } |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |