kc3-lang/SDL/src/events/SDL_quit.c

Branch : - branch - v2.28 - tag -

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• Author : Sam Lantinga
  Date : 2020-01-16 20:49:25
  Hash : a8780c6a
  Message : Updated copyright date for 2020

• src/events/SDL_quit.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2020 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: */