Mercurial > sdl-ios-xcode
annotate src/SDL_fatal.c @ 1199:2d6dc7de1145
From: Mike Frysinger <vapier@gentoo.org>
To: sdl@libsdl.org
Date: Sun, 11 Dec 2005 22:57:37 -0500
Subject: [SDL] exec stack in libsdl update
i posted back in September a patch to remove executable stacks:
http://www.devolution.com/pipermail/sdl/2005-September/070626.html
later in November, a similar patch was merged it seems:
http://www.libsdl.org/cgi/cvsweb.cgi/SDL12/src/hermes/mmx_main.asm
however, this lacks the additional output format checks that i posted in my
patch ... this isnt a problem if the hermes asm code is only ever used to
produce ELF objects, but if this is not true, then the additional checks in
my original patch will need to be merged
-mike
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 12 Dec 2005 09:13:12 +0000 |
| parents | 51a8702d8ecd |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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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 | |
|
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28 #ifdef _WIN32_WCE |
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29 #define NO_SIGNAL_H |
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30 #endif |
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31 |
| 0 | 32 /* General fatal signal handling code for SDL */ |
| 33 | |
| 34 #ifdef NO_SIGNAL_H | |
| 35 | |
| 36 /* No signals on this platform, nothing to do.. */ | |
| 37 | |
| 38 void SDL_InstallParachute(void) | |
| 39 { | |
| 40 return; | |
| 41 } | |
| 42 | |
| 43 void SDL_UninstallParachute(void) | |
| 44 { | |
| 45 return; | |
| 46 } | |
| 47 | |
| 48 #else | |
| 49 | |
| 50 #include <stdlib.h> | |
| 51 #include <stdio.h> | |
| 52 #include <signal.h> | |
| 53 #include <string.h> | |
| 54 | |
| 55 #include "SDL.h" | |
| 56 #include "SDL_fatal.h" | |
| 57 | |
|
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58 #ifdef __CYGWIN__ |
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59 #define DISABLE_STDIO |
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60 #endif |
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61 |
| 0 | 62 /* This installs some signal handlers for the more common fatal signals, |
| 63 so that if the programmer is lazy, the app doesn't die so horribly if | |
| 64 the program crashes. | |
| 65 */ | |
| 66 | |
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67 static void print_msg(const char *text) |
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68 { |
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69 #ifndef DISABLE_STDIO |
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70 fprintf(stderr, "%s", text); |
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71 #endif |
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72 } |
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73 |
| 0 | 74 static void SDL_Parachute(int sig) |
| 75 { | |
| 76 signal(sig, SIG_DFL); | |
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77 print_msg("Fatal signal: "); |
| 0 | 78 switch (sig) { |
| 79 case SIGSEGV: | |
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80 print_msg("Segmentation Fault"); |
| 0 | 81 break; |
| 82 #ifdef SIGBUS | |
| 83 #if SIGBUS != SIGSEGV | |
| 84 case SIGBUS: | |
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85 print_msg("Bus Error"); |
| 0 | 86 break; |
| 87 #endif | |
| 88 #endif /* SIGBUS */ | |
| 89 #ifdef SIGFPE | |
| 90 case SIGFPE: | |
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91 print_msg("Floating Point Exception"); |
| 0 | 92 break; |
| 93 #endif /* SIGFPE */ | |
| 94 #ifdef SIGQUIT | |
| 95 case SIGQUIT: | |
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96 print_msg("Keyboard Quit"); |
| 0 | 97 break; |
| 98 #endif /* SIGQUIT */ | |
| 99 #ifdef SIGPIPE | |
| 100 case SIGPIPE: | |
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101 print_msg("Broken Pipe"); |
| 0 | 102 break; |
| 103 #endif /* SIGPIPE */ | |
| 104 default: | |
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105 #ifndef DISABLE_STDIO |
| 0 | 106 fprintf(stderr, "# %d", sig); |
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107 #endif |
| 0 | 108 break; |
| 109 } | |
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110 print_msg(" (SDL Parachute Deployed)\n"); |
| 0 | 111 SDL_Quit(); |
| 112 exit(-sig); | |
| 113 } | |
| 114 | |
| 115 static int SDL_fatal_signals[] = { | |
| 116 SIGSEGV, | |
| 117 #ifdef SIGBUS | |
| 118 SIGBUS, | |
| 119 #endif | |
| 120 #ifdef SIGFPE | |
| 121 SIGFPE, | |
| 122 #endif | |
| 123 #ifdef SIGQUIT | |
| 124 SIGQUIT, | |
| 125 #endif | |
| 126 0 | |
| 127 }; | |
| 128 | |
| 129 void SDL_InstallParachute(void) | |
| 130 { | |
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131 /* Set a handler for any fatal signal not already handled */ |
| 0 | 132 int i; |
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133 #ifdef HAVE_SIGACTION |
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134 struct sigaction action; |
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135 |
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136 for ( i=0; SDL_fatal_signals[i]; ++i ) { |
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137 sigaction(SDL_fatal_signals[i], NULL, &action); |
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138 if ( action.sa_handler == SIG_DFL ) { |
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139 action.sa_handler = SDL_Parachute; |
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140 sigaction(SDL_fatal_signals[i], &action, NULL); |
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141 } |
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142 } |
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143 #ifdef SIGALRM |
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144 /* Set SIGALRM to be ignored -- necessary on Solaris */ |
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145 sigaction(SIGALRM, NULL, &action); |
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146 if ( action.sa_handler == SIG_DFL ) { |
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147 action.sa_handler = SIG_IGN; |
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148 sigaction(SIGALRM, &action, NULL); |
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149 } |
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150 #endif |
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151 #else |
| 0 | 152 void (*ohandler)(int); |
| 153 | |
| 154 for ( i=0; SDL_fatal_signals[i]; ++i ) { | |
| 155 ohandler = signal(SDL_fatal_signals[i], SDL_Parachute); | |
| 156 if ( ohandler != SIG_DFL ) { | |
| 157 signal(SDL_fatal_signals[i], ohandler); | |
| 158 } | |
| 159 } | |
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160 #endif /* HAVE_SIGACTION */ |
| 0 | 161 return; |
| 162 } | |
| 163 | |
| 164 void SDL_UninstallParachute(void) | |
| 165 { | |
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166 /* Remove a handler for any fatal signal handled */ |
| 0 | 167 int i; |
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168 #ifdef HAVE_SIGACTION |
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169 struct sigaction action; |
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170 |
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171 for ( i=0; SDL_fatal_signals[i]; ++i ) { |
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172 sigaction(SDL_fatal_signals[i], NULL, &action); |
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173 if ( action.sa_handler == SDL_Parachute ) { |
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174 action.sa_handler = SIG_DFL; |
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175 sigaction(SDL_fatal_signals[i], &action, NULL); |
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176 } |
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177 } |
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178 #else |
| 0 | 179 void (*ohandler)(int); |
| 180 | |
| 181 for ( i=0; SDL_fatal_signals[i]; ++i ) { | |
| 182 ohandler = signal(SDL_fatal_signals[i], SIG_DFL); | |
| 183 if ( ohandler != SDL_Parachute ) { | |
| 184 signal(SDL_fatal_signals[i], ohandler); | |
| 185 } | |
| 186 } | |
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187 #endif /* HAVE_SIGACTION */ |
| 0 | 188 } |
| 189 | |
| 190 #endif /* NO_SIGNAL_H */ |