Mercurial > sdl-ios-xcode
annotate src/SDL_fatal.c @ 1023:e719ee25439d
Fix potential use of freed memory in the threaded timer system
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 04 Jan 2005 19:05:32 +0000 |
| parents | 863da1c38c7e |
| children | 51a8702d8ecd |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 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 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* General fatal signal handling code for SDL */ | |
| 29 | |
| 30 #ifdef NO_SIGNAL_H | |
| 31 | |
| 32 /* No signals on this platform, nothing to do.. */ | |
| 33 | |
| 34 void SDL_InstallParachute(void) | |
| 35 { | |
| 36 return; | |
| 37 } | |
| 38 | |
| 39 void SDL_UninstallParachute(void) | |
| 40 { | |
| 41 return; | |
| 42 } | |
| 43 | |
| 44 #else | |
| 45 | |
| 46 #include <stdlib.h> | |
| 47 #include <stdio.h> | |
| 48 #include <signal.h> | |
| 49 #include <string.h> | |
| 50 | |
| 51 #include "SDL.h" | |
| 52 #include "SDL_fatal.h" | |
| 53 | |
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54 #ifdef __CYGWIN__ |
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55 #define DISABLE_STDIO |
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56 #endif |
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57 |
| 0 | 58 /* This installs some signal handlers for the more common fatal signals, |
| 59 so that if the programmer is lazy, the app doesn't die so horribly if | |
| 60 the program crashes. | |
| 61 */ | |
| 62 | |
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63 static void print_msg(const char *text) |
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64 { |
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65 #ifndef DISABLE_STDIO |
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66 fprintf(stderr, "%s", text); |
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67 #endif |
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68 } |
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69 |
| 0 | 70 static void SDL_Parachute(int sig) |
| 71 { | |
| 72 signal(sig, SIG_DFL); | |
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73 print_msg("Fatal signal: "); |
| 0 | 74 switch (sig) { |
| 75 case SIGSEGV: | |
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76 print_msg("Segmentation Fault"); |
| 0 | 77 break; |
| 78 #ifdef SIGBUS | |
| 79 #if SIGBUS != SIGSEGV | |
| 80 case SIGBUS: | |
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81 print_msg("Bus Error"); |
| 0 | 82 break; |
| 83 #endif | |
| 84 #endif /* SIGBUS */ | |
| 85 #ifdef SIGFPE | |
| 86 case SIGFPE: | |
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87 print_msg("Floating Point Exception"); |
| 0 | 88 break; |
| 89 #endif /* SIGFPE */ | |
| 90 #ifdef SIGQUIT | |
| 91 case SIGQUIT: | |
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92 print_msg("Keyboard Quit"); |
| 0 | 93 break; |
| 94 #endif /* SIGQUIT */ | |
| 95 #ifdef SIGPIPE | |
| 96 case SIGPIPE: | |
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97 print_msg("Broken Pipe"); |
| 0 | 98 break; |
| 99 #endif /* SIGPIPE */ | |
| 100 default: | |
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101 #ifndef DISABLE_STDIO |
| 0 | 102 fprintf(stderr, "# %d", sig); |
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103 #endif |
| 0 | 104 break; |
| 105 } | |
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106 print_msg(" (SDL Parachute Deployed)\n"); |
| 0 | 107 SDL_Quit(); |
| 108 exit(-sig); | |
| 109 } | |
| 110 | |
| 111 static int SDL_fatal_signals[] = { | |
| 112 SIGSEGV, | |
| 113 #ifdef SIGBUS | |
| 114 SIGBUS, | |
| 115 #endif | |
| 116 #ifdef SIGFPE | |
| 117 SIGFPE, | |
| 118 #endif | |
| 119 #ifdef SIGQUIT | |
| 120 SIGQUIT, | |
| 121 #endif | |
| 122 0 | |
| 123 }; | |
| 124 | |
| 125 void SDL_InstallParachute(void) | |
| 126 { | |
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127 /* Set a handler for any fatal signal not already handled */ |
| 0 | 128 int i; |
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129 #ifdef HAVE_SIGACTION |
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130 struct sigaction action; |
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131 |
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132 for ( i=0; SDL_fatal_signals[i]; ++i ) { |
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133 sigaction(SDL_fatal_signals[i], NULL, &action); |
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134 if ( action.sa_handler == SIG_DFL ) { |
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135 action.sa_handler = SDL_Parachute; |
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136 sigaction(SDL_fatal_signals[i], &action, NULL); |
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137 } |
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138 } |
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139 #ifdef SIGALRM |
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140 /* Set SIGALRM to be ignored -- necessary on Solaris */ |
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141 sigaction(SIGALRM, NULL, &action); |
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142 if ( action.sa_handler == SIG_DFL ) { |
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143 action.sa_handler = SIG_IGN; |
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144 sigaction(SIGALRM, &action, NULL); |
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145 } |
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146 #endif |
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147 #else |
| 0 | 148 void (*ohandler)(int); |
| 149 | |
| 150 for ( i=0; SDL_fatal_signals[i]; ++i ) { | |
| 151 ohandler = signal(SDL_fatal_signals[i], SDL_Parachute); | |
| 152 if ( ohandler != SIG_DFL ) { | |
| 153 signal(SDL_fatal_signals[i], ohandler); | |
| 154 } | |
| 155 } | |
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156 #endif /* HAVE_SIGACTION */ |
| 0 | 157 return; |
| 158 } | |
| 159 | |
| 160 void SDL_UninstallParachute(void) | |
| 161 { | |
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162 /* Remove a handler for any fatal signal handled */ |
| 0 | 163 int i; |
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164 #ifdef HAVE_SIGACTION |
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165 struct sigaction action; |
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166 |
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167 for ( i=0; SDL_fatal_signals[i]; ++i ) { |
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168 sigaction(SDL_fatal_signals[i], NULL, &action); |
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169 if ( action.sa_handler == SDL_Parachute ) { |
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170 action.sa_handler = SIG_DFL; |
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171 sigaction(SDL_fatal_signals[i], &action, NULL); |
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172 } |
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173 } |
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174 #else |
| 0 | 175 void (*ohandler)(int); |
| 176 | |
| 177 for ( i=0; SDL_fatal_signals[i]; ++i ) { | |
| 178 ohandler = signal(SDL_fatal_signals[i], SIG_DFL); | |
| 179 if ( ohandler != SDL_Parachute ) { | |
| 180 signal(SDL_fatal_signals[i], ohandler); | |
| 181 } | |
| 182 } | |
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183 #endif /* HAVE_SIGACTION */ |
| 0 | 184 } |
| 185 | |
| 186 #endif /* NO_SIGNAL_H */ |