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annotate src/SDL_fatal.c @ 3880:74e828c64315 SDL-1.2

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Fixed bug #292 I might be on crack here. It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and right channels of a stereo stream together, and clamps the new mono channel if it would overflow. Shouldn't it be dividing by 2 to average the two sample points instead of clamping? Otherwise the mono sample point's volume doubles in the conversion. This would also make the conversion faster, as it replaces two branches per sample frame with a bitwise shift. --ryan.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 24 Sep 2006 15:45:37 +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 */