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annotate src/SDL_fatal.c @ 4391:07b330419439 SDL-1.2

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Fixed bug #849 some more: Tim Angus 2009-11-26 14:41:04 PST Fix to the cursor not being responsive when the app doesn't have SDL_APPINPUTFOCUS The problems with the directx driver are similar to the ones I introduced in the windib driver with r4478. Basically if the application did not have focus, the mouse position is not updated. It's not really that the mouse cursor was invisible, it's that it is stuck underneath another window where you can't see it. This behaviour predates my r4478 changes and is the reason I unwittingly broke the windib driver as I had been replicating the way the directx driver deals with focus. Prior to r4478 the directx driver could not be used in windowed mode, so the broken focusing would not have actually been observable. Anyway, the attached patch makes the directx driver behaves like the windib driver in terms of focus. Time for 1.2.15? ;) I've added an additional change of moving the calls to WIN_GrabInput that are made on WM_ACTIVATE messages so that they only occur when the state is SDL_APPINPUTFOCUS. When a fullscreen application is minimised using alt-tab, it still receives WM_ACTIVATE messages when other applications are selected. If WIN_GrabInput is called when the SDL application doesn't have input focus, bad things happen; it shouldn't be being called at all. I've also added a line to make sure that SDL_APPMOUSEFOCUS state is dropped when the application is minimised following an alt-tab.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Dec 2009 15:24:53 +0000
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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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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 */