e14743d1 |
1 | /* |
2 | SDL - Simple DirectMedia Layer |
3 | Copyright (C) 1997-2009 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 | This library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with this library; if not, write to the Free Software |
17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
18 | |
19 | Sam Lantinga |
20 | slouken@libsdl.org |
21 | */ |
22 | #include "SDL_config.h" |
23 | |
24 | /* General fatal signal handling code for SDL */ |
25 | |
26 | #ifdef HAVE_SIGNAL_H |
27 | |
28 | #include <signal.h> |
29 | |
30 | #include "SDL.h" |
31 | #include "SDL_fatal.h" |
32 | |
33 | /* This installs some signal handlers for the more common fatal signals, |
34 | so that if the programmer is lazy, the app doesn't die so horribly if |
35 | the program crashes. |
36 | */ |
37 | |
38 | static void SDL_Parachute(int sig) |
39 | { |
40 | signal(sig, SIG_DFL); |
41 | SDL_Quit(); |
42 | raise(sig); |
43 | } |
44 | |
45 | static int SDL_fatal_signals[] = { |
46 | SIGSEGV, |
47 | #ifdef SIGBUS |
48 | SIGBUS, |
49 | #endif |
50 | #ifdef SIGFPE |
51 | SIGFPE, |
52 | #endif |
53 | #ifdef SIGQUIT |
54 | SIGQUIT, |
55 | #endif |
56 | 0 |
57 | }; |
58 | |
59 | void SDL_InstallParachute(void) |
60 | { |
61 | /* Set a handler for any fatal signal not already handled */ |
62 | int i; |
63 | #ifdef HAVE_SIGACTION |
64 | struct sigaction action; |
65 | |
66 | for ( i=0; SDL_fatal_signals[i]; ++i ) { |
67 | sigaction(SDL_fatal_signals[i], NULL, &action); |
68 | if ( action.sa_handler == SIG_DFL ) { |
69 | action.sa_handler = SDL_Parachute; |
70 | sigaction(SDL_fatal_signals[i], &action, NULL); |
71 | } |
72 | } |
73 | #ifdef SIGALRM |
74 | /* Set SIGALRM to be ignored -- necessary on Solaris */ |
75 | sigaction(SIGALRM, NULL, &action); |
76 | if ( action.sa_handler == SIG_DFL ) { |
77 | action.sa_handler = SIG_IGN; |
78 | sigaction(SIGALRM, &action, NULL); |
79 | } |
80 | #endif |
81 | #else |
82 | void (*ohandler)(int); |
83 | |
84 | for ( i=0; SDL_fatal_signals[i]; ++i ) { |
85 | ohandler = signal(SDL_fatal_signals[i], SDL_Parachute); |
86 | if ( ohandler != SIG_DFL ) { |
87 | signal(SDL_fatal_signals[i], ohandler); |
88 | } |
89 | } |
90 | #endif /* HAVE_SIGACTION */ |
91 | return; |
92 | } |
93 | |
94 | void SDL_UninstallParachute(void) |
95 | { |
96 | /* Remove a handler for any fatal signal handled */ |
97 | int i; |
98 | #ifdef HAVE_SIGACTION |
99 | struct sigaction action; |
100 | |
101 | for ( i=0; SDL_fatal_signals[i]; ++i ) { |
102 | sigaction(SDL_fatal_signals[i], NULL, &action); |
103 | if ( action.sa_handler == SDL_Parachute ) { |
104 | action.sa_handler = SIG_DFL; |
105 | sigaction(SDL_fatal_signals[i], &action, NULL); |
106 | } |
107 | } |
108 | #else |
109 | void (*ohandler)(int); |
110 | |
111 | for ( i=0; SDL_fatal_signals[i]; ++i ) { |
112 | ohandler = signal(SDL_fatal_signals[i], SIG_DFL); |
113 | if ( ohandler != SDL_Parachute ) { |
114 | signal(SDL_fatal_signals[i], ohandler); |
115 | } |
116 | } |
117 | #endif /* HAVE_SIGACTION */ |
118 | } |
119 | |
120 | #else |
121 | |
122 | /* No signals on this platform, nothing to do.. */ |
123 | |
124 | void SDL_InstallParachute(void) |
125 | { |
126 | return; |
127 | } |
128 | |
129 | void SDL_UninstallParachute(void) |
130 | { |
131 | return; |
132 | } |
133 | |
134 | #endif /* HAVE_SIGNAL_H */ |