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annotate src/SDL_fatal.c @ 1342:d73be99e9420

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Fixed it Hayashi Naoyuki's way. :)
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 12:15:46 +0000
parents 450721ad5436
children d910939febfa
rev   line source
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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
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23 /* General fatal signal handling code for SDL */
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24
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25 #include "SDL_config.h"
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26
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27 #ifdef HAVE_SIGNAL_H
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28
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29 #include <signal.h>
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30
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31 #include "SDL.h"
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32 #include "SDL_fatal.h"
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33
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34 /* This installs some signal handlers for the more common fatal signals,
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35 so that if the programmer is lazy, the app doesn't die so horribly if
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36 the program crashes.
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37 */
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38
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39 static void SDL_Parachute(int sig)
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40 {
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41 signal(sig, SIG_DFL);
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42 SDL_Quit();
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43 raise(sig);
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44 }
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45
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46 static int SDL_fatal_signals[] = {
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47 SIGSEGV,
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48 #ifdef SIGBUS
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49 SIGBUS,
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50 #endif
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51 #ifdef SIGFPE
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52 SIGFPE,
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53 #endif
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54 #ifdef SIGQUIT
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55 SIGQUIT,
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56 #endif
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57 0
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58 };
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59
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60 void SDL_InstallParachute(void)
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61 {
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62 /* Set a handler for any fatal signal not already handled */
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63 int i;
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64 #ifdef HAVE_SIGACTION
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65 struct sigaction action;
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66
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67 for ( i=0; SDL_fatal_signals[i]; ++i ) {
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68 sigaction(SDL_fatal_signals[i], NULL, &action);
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69 if ( action.sa_handler == SIG_DFL ) {
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70 action.sa_handler = SDL_Parachute;
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71 sigaction(SDL_fatal_signals[i], &action, NULL);
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72 }
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73 }
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74 #ifdef SIGALRM
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75 /* Set SIGALRM to be ignored -- necessary on Solaris */
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76 sigaction(SIGALRM, NULL, &action);
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77 if ( action.sa_handler == SIG_DFL ) {
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78 action.sa_handler = SIG_IGN;
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79 sigaction(SIGALRM, &action, NULL);
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80 }
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81 #endif
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82 #else
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83 void (*ohandler)(int);
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84
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85 for ( i=0; SDL_fatal_signals[i]; ++i ) {
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86 ohandler = signal(SDL_fatal_signals[i], SDL_Parachute);
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87 if ( ohandler != SIG_DFL ) {
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88 signal(SDL_fatal_signals[i], ohandler);
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89 }
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90 }
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91 #endif /* HAVE_SIGACTION */
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92 return;
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93 }
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94
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95 void SDL_UninstallParachute(void)
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96 {
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97 /* Remove a handler for any fatal signal handled */
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98 int i;
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99 #ifdef HAVE_SIGACTION
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100 struct sigaction action;
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101
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102 for ( i=0; SDL_fatal_signals[i]; ++i ) {
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103 sigaction(SDL_fatal_signals[i], NULL, &action);
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104 if ( action.sa_handler == SDL_Parachute ) {
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105 action.sa_handler = SIG_DFL;
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106 sigaction(SDL_fatal_signals[i], &action, NULL);
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107 }
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108 }
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109 #else
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110 void (*ohandler)(int);
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111
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112 for ( i=0; SDL_fatal_signals[i]; ++i ) {
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113 ohandler = signal(SDL_fatal_signals[i], SIG_DFL);
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114 if ( ohandler != SDL_Parachute ) {
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115 signal(SDL_fatal_signals[i], ohandler);
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116 }
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117 }
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118 #endif /* HAVE_SIGACTION */
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119 }
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120
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121 #else
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122
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123 /* No signals on this platform, nothing to do.. */
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124
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125 void SDL_InstallParachute(void)
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126 {
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127 return;
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128 }
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129
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130 void SDL_UninstallParachute(void)
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131 {
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132 return;
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133 }
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134
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135 #endif /* HAVE_SIGNAL_H */