| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 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@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 */ |