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

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• Hash : 0e45984f
  Author :
  Date : 2015-06-21T17:33:46
  

  Fixed crash if initialization of EGL failed but was tried again later. The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly uninitialized data structure if loading the library first failed. A later try to use EGL then skipped initialization and assumed it was previously successful because the data structure now already existed. This led to at least one crash in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was dereferenced to make a call to eglBindAPI().

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• src/events/SDL_quit.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2015 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"
  
  static SDL_bool disable_signals = SDL_FALSE;
  static SDL_bool send_quit_pending = SDL_FALSE;
  
  #ifdef HAVE_SIGNAL_H
  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! */
      send_quit_pending = SDL_TRUE;
  }
  #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 && action.sa_sigaction == (void*)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 && action.sa_sigaction == (void*)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 */
  
      /* That's it! */
      return 0;
  }
  
  int
  SDL_QuitInit(void)
  {
      const char *hint = SDL_GetHint(SDL_HINT_NO_SIGNAL_HANDLERS);
      disable_signals = hint && (SDL_atoi(hint) == 1);
      if (!disable_signals) {
          return SDL_QuitInit_Internal();
      }
      return 0;
  }
  
  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);
  
      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 */
  }
  
  void
  SDL_QuitQuit(void)
  {
      if (!disable_signals) {
          SDL_QuitQuit_Internal();
      }
  }
  
  /* This function returns 1 if it's okay to close the application window */
  int
  SDL_SendQuit(void)
  {
      send_quit_pending = SDL_FALSE;
      return SDL_SendAppEvent(SDL_QUIT);
  }
  
  void
  SDL_SendPendingQuit(void)
  {
      if (send_quit_pending) {
          SDL_SendQuit();
          SDL_assert(!send_quit_pending);
      }
  }
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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