SDL_fatal.c
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2006 Sam Lantinga
4
5
This library is free software; you can redistribute it and/or
6
modify it under the terms of the GNU Lesser General Public
7
License as published by the Free Software Foundation; either
8
version 2.1 of the License, or (at your option) any later version.
9
10
11
12
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
13
Lesser General Public License for more details.
15
16
17
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19
Sam Lantinga
20
slouken@libsdl.org
21
22
*/
23
24
25
26
#ifdef _WIN32_WCE
#define NO_SIGNAL_H
#endif
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
/* 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"
53
54
55
56
#ifdef __CYGWIN__
#define DISABLE_STDIO
#endif
57
58
59
60
61
/* 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.
*/
62
63
64
65
66
67
68
static void print_msg(const char *text)
{
#ifndef DISABLE_STDIO
fprintf(stderr, "%s", text);
#endif
}
69
70
71
static void SDL_Parachute(int sig)
{
signal(sig, SIG_DFL);
72
print_msg("Fatal signal: ");
73
74
switch (sig) {
case SIGSEGV:
75
print_msg("Segmentation Fault");
76
77
78
79
break;
#ifdef SIGBUS
#if SIGBUS != SIGSEGV
case SIGBUS:
80
print_msg("Bus Error");
81
82
83
84
85
break;
#endif
#endif /* SIGBUS */
#ifdef SIGFPE
case SIGFPE:
86
print_msg("Floating Point Exception");
87
88
89
90
break;
#endif /* SIGFPE */
#ifdef SIGQUIT
case SIGQUIT:
91
print_msg("Keyboard Quit");
92
93
94
95
break;
#endif /* SIGQUIT */
#ifdef SIGPIPE
case SIGPIPE:
96
print_msg("Broken Pipe");
97
98
99
break;
#endif /* SIGPIPE */
default:
100
#ifndef DISABLE_STDIO
101
fprintf(stderr, "# %d", sig);
102
#endif
103
104
break;
}
105
print_msg(" (SDL Parachute Deployed)\n");
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
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)
{
126
/* Set a handler for any fatal signal not already handled */
127
int i;
128
129
#ifdef HAVE_SIGACTION
struct sigaction action;
130
131
for ( i=0; SDL_fatal_signals[i]; ++i ) {
132
133
134
135
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);
136
137
138
139
}
}
#ifdef SIGALRM
/* Set SIGALRM to be ignored -- necessary on Solaris */
140
141
sigaction(SIGALRM, NULL, &action);
if ( action.sa_handler == SIG_DFL ) {
142
action.sa_handler = SIG_IGN;
143
sigaction(SIGALRM, &action, NULL);
144
145
146
147
}
#endif
#else
void (*ohandler)(int);
149
150
151
152
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);
153
154
}
}
155
#endif /* HAVE_SIGACTION */
156
157
158
159
160
return;
}
void SDL_UninstallParachute(void)
{
161
/* Remove a handler for any fatal signal handled */
162
int i;
163
164
165
166
167
168
169
170
171
172
173
#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
174
175
176
177
178
179
180
181
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);
}
}
182
#endif /* HAVE_SIGACTION */
183
184
185
}
#endif /* NO_SIGNAL_H */