SDL_fatal.c
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2004 Sam Lantinga
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
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
20
slouken@libsdl.org
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
*/
#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"
54
55
56
57
#ifdef __CYGWIN__
#define DISABLE_STDIO
#endif
58
59
60
61
62
/* 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.
*/
63
64
65
66
67
68
69
static void print_msg(const char *text)
{
#ifndef DISABLE_STDIO
fprintf(stderr, "%s", text);
#endif
}
70
71
72
static void SDL_Parachute(int sig)
{
signal(sig, SIG_DFL);
73
print_msg("Fatal signal: ");
74
75
switch (sig) {
case SIGSEGV:
76
print_msg("Segmentation Fault");
77
78
79
80
break;
#ifdef SIGBUS
#if SIGBUS != SIGSEGV
case SIGBUS:
81
print_msg("Bus Error");
82
83
84
85
86
break;
#endif
#endif /* SIGBUS */
#ifdef SIGFPE
case SIGFPE:
87
print_msg("Floating Point Exception");
88
89
90
91
break;
#endif /* SIGFPE */
#ifdef SIGQUIT
case SIGQUIT:
92
print_msg("Keyboard Quit");
93
94
95
96
break;
#endif /* SIGQUIT */
#ifdef SIGPIPE
case SIGPIPE:
97
print_msg("Broken Pipe");
98
99
100
break;
#endif /* SIGPIPE */
default:
101
#ifndef DISABLE_STDIO
102
fprintf(stderr, "# %d", sig);
103
#endif
104
105
break;
}
106
print_msg(" (SDL Parachute Deployed)\n");
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
SDL_Quit();
exit(-sig);
}
static int SDL_fatal_signals[] = {
SIGSEGV,
#ifdef SIGBUS
SIGBUS,
#endif
#ifdef SIGFPE
SIGFPE,
#endif
#ifdef SIGQUIT
SIGQUIT,
#endif
#ifdef SIGPIPE
SIGPIPE,
#endif
0
};
void SDL_InstallParachute(void)
{
130
/* Set a handler for any fatal signal not already handled */
131
int i;
132
133
#ifdef HAVE_SIGACTION
struct sigaction action;
134
135
for ( i=0; SDL_fatal_signals[i]; ++i ) {
136
137
138
139
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);
140
141
142
143
}
}
#ifdef SIGALRM
/* Set SIGALRM to be ignored -- necessary on Solaris */
144
145
sigaction(SIGALRM, NULL, &action);
if ( action.sa_handler == SIG_DFL ) {
146
action.sa_handler = SIG_IGN;
147
148
149
150
151
sigaction(SDL_fatal_signals[i], &action, NULL);
}
#endif
#else
void (*ohandler)(int);
153
154
155
156
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);
157
158
}
}
159
#endif /* HAVE_SIGACTION */
160
161
162
163
164
return;
}
void SDL_UninstallParachute(void)
{
165
/* Remove a handler for any fatal signal handled */
166
int i;
167
168
169
170
171
172
173
174
175
176
177
#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
178
179
180
181
182
183
184
185
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);
}
}
186
#endif /* HAVE_SIGACTION */
187
188
189
}
#endif /* NO_SIGNAL_H */