cscg22-gearboy

CSCG 2022 Challenge 'Gearboy'
git clone https://git.sinitax.com/sinitax/cscg22-gearboy
Log | Files | Refs | sfeed.txt

SDL_quit.c (3312B)

      1/*
      2  Simple DirectMedia Layer
      3  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
      4
      5  This software is provided 'as-is', without any express or implied
      6  warranty.  In no event will the authors be held liable for any damages
      7  arising from the use of this software.
      8
      9  Permission is granted to anyone to use this software for any purpose,
     10  including commercial applications, and to alter it and redistribute it
     11  freely, subject to the following restrictions:
     12
     13  1. The origin of this software must not be misrepresented; you must not
     14     claim that you wrote the original software. If you use this software
     15     in a product, an acknowledgment in the product documentation would be
     16     appreciated but is not required.
     17  2. Altered source versions must be plainly marked as such, and must not be
     18     misrepresented as being the original software.
     19  3. This notice may not be removed or altered from any source distribution.
     20*/
     21#include "../SDL_internal.h"
     22
     23/* General quit handling code for SDL */
     24
     25#ifdef HAVE_SIGNAL_H
     26#include <signal.h>
     27#endif
     28
     29#include "SDL_events.h"
     30#include "SDL_events_c.h"
     31
     32
     33#ifdef HAVE_SIGNAL_H
     34static void
     35SDL_HandleSIG(int sig)
     36{
     37    /* Reset the signal handler */
     38    signal(sig, SDL_HandleSIG);
     39
     40    /* Signal a quit interrupt */
     41    SDL_SendQuit();
     42}
     43#endif /* HAVE_SIGNAL_H */
     44
     45/* Public functions */
     46int
     47SDL_QuitInit(void)
     48{
     49#ifdef HAVE_SIGACTION
     50    struct sigaction action;
     51    sigaction(SIGINT, NULL, &action);
     52#ifdef HAVE_SA_SIGACTION
     53    if ( action.sa_handler == SIG_DFL && action.sa_sigaction == (void*)SIG_DFL ) {
     54#else
     55    if ( action.sa_handler == SIG_DFL ) {
     56#endif
     57        action.sa_handler = SDL_HandleSIG;
     58        sigaction(SIGINT, &action, NULL);
     59    }
     60    sigaction(SIGTERM, NULL, &action);
     61
     62#ifdef HAVE_SA_SIGACTION
     63    if ( action.sa_handler == SIG_DFL && action.sa_sigaction == (void*)SIG_DFL ) {
     64#else
     65    if ( action.sa_handler == SIG_DFL ) {
     66#endif
     67        action.sa_handler = SDL_HandleSIG;
     68        sigaction(SIGTERM, &action, NULL);
     69    }
     70#elif HAVE_SIGNAL_H
     71    void (*ohandler) (int);
     72
     73    /* Both SIGINT and SIGTERM are translated into quit interrupts */
     74    ohandler = signal(SIGINT, SDL_HandleSIG);
     75    if (ohandler != SIG_DFL)
     76        signal(SIGINT, ohandler);
     77    ohandler = signal(SIGTERM, SDL_HandleSIG);
     78    if (ohandler != SIG_DFL)
     79        signal(SIGTERM, ohandler);
     80#endif /* HAVE_SIGNAL_H */
     81
     82    /* That's it! */
     83    return (0);
     84}
     85
     86void
     87SDL_QuitQuit(void)
     88{
     89#ifdef HAVE_SIGACTION
     90    struct sigaction action;
     91    sigaction(SIGINT, NULL, &action);
     92    if ( action.sa_handler == SDL_HandleSIG ) {
     93        action.sa_handler = SIG_DFL;
     94        sigaction(SIGINT, &action, NULL);
     95    }
     96    sigaction(SIGTERM, NULL, &action);
     97    if ( action.sa_handler == SDL_HandleSIG ) {
     98        action.sa_handler = SIG_DFL;
     99        sigaction(SIGTERM, &action, NULL);
    100    }
    101#elif HAVE_SIGNAL_H
    102    void (*ohandler) (int);
    103
    104    ohandler = signal(SIGINT, SIG_DFL);
    105    if (ohandler != SDL_HandleSIG)
    106        signal(SIGINT, ohandler);
    107    ohandler = signal(SIGTERM, SIG_DFL);
    108    if (ohandler != SDL_HandleSIG)
    109        signal(SIGTERM, ohandler);
    110#endif /* HAVE_SIGNAL_H */
    111}
    112
    113/* This function returns 1 if it's okay to close the application window */
    114int
    115SDL_SendQuit(void)
    116{
    117    return SDL_SendAppEvent(SDL_QUIT);
    118}
    119
    120/* vi: set ts=4 sw=4 expandtab: */