SDL_fatal.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2004 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
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slouken@libsdl.org
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*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif
/* General fatal signal handling code for SDL */
#ifdef NO_SIGNAL_H
/* No signals on this platform, nothing to do.. */
void SDL_InstallParachute(void)
{
return;
}
void SDL_UninstallParachute(void)
{
return;
}
#else
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include "SDL.h"
#include "SDL_fatal.h"
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#ifdef __CYGWIN__
#define DISABLE_STDIO
#endif
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/* This installs some signal handlers for the more common fatal signals,
so that if the programmer is lazy, the app doesn't die so horribly if
the program crashes.
*/
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static void print_msg(const char *text)
{
#ifndef DISABLE_STDIO
fprintf(stderr, "%s", text);
#endif
}
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static void SDL_Parachute(int sig)
{
signal(sig, SIG_DFL);
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print_msg("Fatal signal: ");
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switch (sig) {
case SIGSEGV:
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print_msg("Segmentation Fault");
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break;
#ifdef SIGBUS
#if SIGBUS != SIGSEGV
case SIGBUS:
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print_msg("Bus Error");
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break;
#endif
#endif /* SIGBUS */
#ifdef SIGFPE
case SIGFPE:
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print_msg("Floating Point Exception");
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break;
#endif /* SIGFPE */
#ifdef SIGQUIT
case SIGQUIT:
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print_msg("Keyboard Quit");
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break;
#endif /* SIGQUIT */
#ifdef SIGPIPE
case SIGPIPE:
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print_msg("Broken Pipe");
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break;
#endif /* SIGPIPE */
default:
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#ifndef DISABLE_STDIO
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fprintf(stderr, "# %d", sig);
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#endif
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break;
}
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print_msg(" (SDL Parachute Deployed)\n");
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SDL_Quit();
exit(-sig);
}
static int SDL_fatal_signals[] = {
SIGSEGV,
#ifdef SIGBUS
SIGBUS,
#endif
#ifdef SIGFPE
SIGFPE,
#endif
#ifdef SIGQUIT
SIGQUIT,
#endif
0
};
void SDL_InstallParachute(void)
{
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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
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);
if ( action.sa_handler == SIG_DFL ) {
action.sa_handler = SDL_Parachute;
sigaction(SDL_fatal_signals[i], &action, NULL);
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}
}
#ifdef SIGALRM
/* Set SIGALRM to be ignored -- necessary on Solaris */
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sigaction(SIGALRM, NULL, &action);
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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}
#endif
#else
void (*ohandler)(int);
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for ( i=0; SDL_fatal_signals[i]; ++i ) {
ohandler = signal(SDL_fatal_signals[i], SDL_Parachute);
if ( ohandler != SIG_DFL ) {
signal(SDL_fatal_signals[i], ohandler);
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}
}
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#endif /* HAVE_SIGACTION */
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return;
}
void SDL_UninstallParachute(void)
{
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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
struct sigaction action;
for ( i=0; SDL_fatal_signals[i]; ++i ) {
sigaction(SDL_fatal_signals[i], NULL, &action);
if ( action.sa_handler == SDL_Parachute ) {
action.sa_handler = SIG_DFL;
sigaction(SDL_fatal_signals[i], &action, NULL);
}
}
#else
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void (*ohandler)(int);
for ( i=0; SDL_fatal_signals[i]; ++i ) {
ohandler = signal(SDL_fatal_signals[i], SIG_DFL);
if ( ohandler != SDL_Parachute ) {
signal(SDL_fatal_signals[i], ohandler);
}
}
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#endif /* HAVE_SIGACTION */
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}
#endif /* NO_SIGNAL_H */