src/SDL_fatal.c
author Edgar Simo <bobbens@gmail.com>
Mon, 04 Aug 2008 17:30:17 +0000
branchgsoc2008_force_feedback
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* General fatal signal handling code for SDL */
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#ifdef HAVE_SIGNAL_H
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#include <signal.h>
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#include "SDL.h"
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#include "SDL_fatal.h"
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/* This installs some signal handlers for the more common fatal signals,
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   so that if the programmer is lazy, the app doesn't die so horribly if
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   the program crashes.
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*/
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static void
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SDL_Parachute(int sig)
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{
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    signal(sig, SIG_DFL);
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    SDL_Quit();
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    raise(sig);
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}
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static int SDL_fatal_signals[] = {
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    SIGSEGV,
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#ifdef SIGBUS
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    SIGBUS,
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#endif
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#ifdef SIGFPE
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    SIGFPE,
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#endif
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#ifdef SIGQUIT
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    SIGQUIT,
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#endif
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    0
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};
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void
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SDL_InstallParachute(void)
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{
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    /* Set a handler for any fatal signal not already handled */
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    int i;
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#ifdef HAVE_SIGACTION
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    struct sigaction action;
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    for (i = 0; SDL_fatal_signals[i]; ++i) {
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        sigaction(SDL_fatal_signals[i], NULL, &action);
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        if (action.sa_handler == SIG_DFL) {
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            action.sa_handler = SDL_Parachute;
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            sigaction(SDL_fatal_signals[i], &action, NULL);
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        }
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    }
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#ifdef SIGALRM
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    /* Set SIGALRM to be ignored -- necessary on Solaris */
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    sigaction(SIGALRM, NULL, &action);
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    if (action.sa_handler == SIG_DFL) {
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        action.sa_handler = SIG_IGN;
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        sigaction(SIGALRM, &action, NULL);
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    }
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#endif
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#else
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    void (*ohandler) (int);
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    for (i = 0; SDL_fatal_signals[i]; ++i) {
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        ohandler = signal(SDL_fatal_signals[i], SDL_Parachute);
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        if (ohandler != SIG_DFL) {
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            signal(SDL_fatal_signals[i], ohandler);
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        }
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    }
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#endif /* HAVE_SIGACTION */
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    return;
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}
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void
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SDL_UninstallParachute(void)
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{
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    /* Remove a handler for any fatal signal handled */
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    int i;
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#ifdef HAVE_SIGACTION
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    struct sigaction action;
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    for (i = 0; SDL_fatal_signals[i]; ++i) {
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        sigaction(SDL_fatal_signals[i], NULL, &action);
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        if (action.sa_handler == SDL_Parachute) {
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            action.sa_handler = SIG_DFL;
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            sigaction(SDL_fatal_signals[i], &action, NULL);
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        }
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    }
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#else
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    void (*ohandler) (int);
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    for (i = 0; SDL_fatal_signals[i]; ++i) {
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        ohandler = signal(SDL_fatal_signals[i], SIG_DFL);
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        if (ohandler != SDL_Parachute) {
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            signal(SDL_fatal_signals[i], ohandler);
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        }
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    }
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#endif /* HAVE_SIGACTION */
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}
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#else
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/* No signals on this platform, nothing to do.. */
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void
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SDL_InstallParachute(void)
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{
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    return;
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}
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void
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SDL_UninstallParachute(void)
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{
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    return;
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}
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#endif /* HAVE_SIGNAL_H */
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/* vi: set ts=4 sw=4 expandtab: */