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annotate src/SDL_fatal.c @ 4109:cd2ab40f1219 SDL-1.2

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Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 29 Dec 2007 05:18:33 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* General fatal signal handling code for SDL */
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25
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26 #ifdef HAVE_SIGNAL_H
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27
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28 #include <signal.h>
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29
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30 #include "SDL.h"
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31 #include "SDL_fatal.h"
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32
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33 /* This installs some signal handlers for the more common fatal signals,
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34 so that if the programmer is lazy, the app doesn't die so horribly if
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35 the program crashes.
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36 */
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37
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38 static void SDL_Parachute(int sig)
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39 {
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40 signal(sig, SIG_DFL);
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41 SDL_Quit();
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42 raise(sig);
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43 }
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44
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45 static int SDL_fatal_signals[] = {
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46 SIGSEGV,
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47 #ifdef SIGBUS
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48 SIGBUS,
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49 #endif
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50 #ifdef SIGFPE
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51 SIGFPE,
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52 #endif
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53 #ifdef SIGQUIT
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54 SIGQUIT,
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55 #endif
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56 0
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57 };
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58
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59 void SDL_InstallParachute(void)
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60 {
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61 /* Set a handler for any fatal signal not already handled */
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62 int i;
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63 #ifdef HAVE_SIGACTION
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64 struct sigaction action;
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65
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66 for ( i=0; SDL_fatal_signals[i]; ++i ) {
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67 sigaction(SDL_fatal_signals[i], NULL, &action);
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68 if ( action.sa_handler == SIG_DFL ) {
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69 action.sa_handler = SDL_Parachute;
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70 sigaction(SDL_fatal_signals[i], &action, NULL);
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71 }
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72 }
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73 #ifdef SIGALRM
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74 /* Set SIGALRM to be ignored -- necessary on Solaris */
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75 sigaction(SIGALRM, NULL, &action);
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76 if ( action.sa_handler == SIG_DFL ) {
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77 action.sa_handler = SIG_IGN;
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78 sigaction(SIGALRM, &action, NULL);
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79 }
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80 #endif
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81 #else
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82 void (*ohandler)(int);
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83
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84 for ( i=0; SDL_fatal_signals[i]; ++i ) {
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85 ohandler = signal(SDL_fatal_signals[i], SDL_Parachute);
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86 if ( ohandler != SIG_DFL ) {
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87 signal(SDL_fatal_signals[i], ohandler);
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88 }
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89 }
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90 #endif /* HAVE_SIGACTION */
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91 return;
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92 }
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93
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94 void SDL_UninstallParachute(void)
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95 {
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96 /* Remove a handler for any fatal signal handled */
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97 int i;
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98 #ifdef HAVE_SIGACTION
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99 struct sigaction action;
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100
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101 for ( i=0; SDL_fatal_signals[i]; ++i ) {
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102 sigaction(SDL_fatal_signals[i], NULL, &action);
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103 if ( action.sa_handler == SDL_Parachute ) {
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104 action.sa_handler = SIG_DFL;
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105 sigaction(SDL_fatal_signals[i], &action, NULL);
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106 }
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107 }
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108 #else
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109 void (*ohandler)(int);
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110
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111 for ( i=0; SDL_fatal_signals[i]; ++i ) {
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112 ohandler = signal(SDL_fatal_signals[i], SIG_DFL);
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113 if ( ohandler != SDL_Parachute ) {
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114 signal(SDL_fatal_signals[i], ohandler);
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115 }
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116 }
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117 #endif /* HAVE_SIGACTION */
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118 }
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119
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120 #else
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121
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122 /* No signals on this platform, nothing to do.. */
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123
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124 void SDL_InstallParachute(void)
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125 {
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126 return;
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127 }
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128
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129 void SDL_UninstallParachute(void)
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130 {
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131 return;
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132 }
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133
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134 #endif /* HAVE_SIGNAL_H */