1 /* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2012 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 (at) 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 */ 135
