annotate src/audio/SDL_audiodev.c @ 297:f6ffac90895c

Updated copyright information for 2002
author Sam Lantinga <slouken@libsdl.org>
date Wed, 06 Mar 2002 11:23:08 +0000
parents e8157fcb3114
children b8d311d90021
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, 1998, 1999, 2000, 2001, 2002 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* Get the name of the audio device we use for output */
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29
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30 #if defined(unix) || defined(__unix__)
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31
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32 #include <stdlib.h>
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33 #include <stdio.h>
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34 #include <fcntl.h>
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35 #include <sys/types.h>
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36 #include <sys/stat.h>
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37 #include <string.h>
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38
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39 #include "SDL_audiodev_c.h"
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40
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41 #ifndef _PATH_DEV_DSP
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42 #ifdef __OpenBSD__
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43 #define _PATH_DEV_DSP "/dev/audio"
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44 #else
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45 #define _PATH_DEV_DSP "/dev/dsp"
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46 #endif
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47 #endif
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48 #ifndef _PATH_DEV_DSP24
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49 #define _PATH_DEV_DSP24 "/dev/sound/dsp"
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50 #endif
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51 #ifndef _PATH_DEV_AUDIO
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52 #define _PATH_DEV_AUDIO "/dev/audio"
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53 #endif
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54
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55
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56 int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic)
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57 {
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58 const char *audiodev;
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59 int audio_fd;
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60 char audiopath[1024];
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61
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62 /* Figure out what our audio device is */
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63 if ( ((audiodev=getenv("SDL_PATH_DSP")) == NULL) &&
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64 ((audiodev=getenv("AUDIODEV")) == NULL) ) {
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65 if ( classic ) {
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66 audiodev = _PATH_DEV_AUDIO;
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67 } else {
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68 struct stat sb;
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69
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70 /* Added support for /dev/sound/\* in Linux 2.4 */
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71 if ( (stat("/dev/sound", &sb) == 0) &&
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72 S_ISDIR(sb.st_mode) ) {
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73 audiodev = _PATH_DEV_DSP24;
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74 } else {
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75 audiodev = _PATH_DEV_DSP;
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76 }
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77 }
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78 }
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79 audio_fd = open(audiodev, flags, 0);
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80
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81 /* If the first open fails, look for other devices */
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82 if ( (audio_fd < 0) && (strlen(audiodev) < (sizeof(audiopath)-3)) ) {
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83 int exists, instance;
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84 struct stat sb;
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85
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86 instance = 1;
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87 do { /* Don't use errno ENOENT - it may not be thread-safe */
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88 sprintf(audiopath, "%s%d", audiodev, instance++);
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89 exists = 0;
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90 if ( stat(audiopath, &sb) == 0 ) {
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91 exists = 1;
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92 audio_fd = open(audiopath, flags, 0);
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93 }
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94 } while ( exists && (audio_fd < 0) );
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95 audiodev = audiopath;
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96 }
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97 if ( path != NULL ) {
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98 strncpy(path, audiodev, maxlen);
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99 path[maxlen-1] = '\0';
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100 }
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101 return(audio_fd);
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102 }
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103
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104 #elif defined(_AIX)
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105
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106 /* Get the name of the audio device we use for output */
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107
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108 #include <stdlib.h>
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109 #include <sys/types.h>
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110 #include <sys/stat.h>
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111 #include <string.h>
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112
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113 #include "SDL_audiodev_c.h"
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114
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115 #ifndef _PATH_DEV_DSP
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116 #define _PATH_DEV_DSP "/dev/%caud%c/%c"
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117 #endif
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118
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119 char devsettings[][3] =
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120 {
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121 { 'p', '0', '1' }, { 'p', '0', '2' }, { 'p', '0', '3' }, { 'p', '0', '4' },
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122 { 'p', '1', '1' }, { 'p', '1', '2' }, { 'p', '1', '3' }, { 'p', '1', '4' },
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123 { 'p', '2', '1' }, { 'p', '2', '2' }, { 'p', '2', '3' }, { 'p', '2', '4' },
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124 { 'p', '3', '1' }, { 'p', '3', '2' }, { 'p', '3', '3' }, { 'p', '3', '4' },
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125 { 'b', '0', '1' }, { 'b', '0', '2' }, { 'b', '0', '3' }, { 'b', '0', '4' },
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126 { 'b', '1', '1' }, { 'b', '1', '2' }, { 'b', '1', '3' }, { 'b', '1', '4' },
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127 { 'b', '2', '1' }, { 'b', '2', '2' }, { 'b', '2', '3' }, { 'b', '2', '4' },
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128 { 'b', '3', '1' }, { 'b', '3', '2' }, { 'b', '3', '3' }, { 'b', '3', '4' },
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129 { '\0', '\0', '\0' }
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130 };
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131
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132 static int OpenUserDefinedDevice(char *path, int maxlen, int flags)
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133 {
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134 const char *audiodev;
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135 int audio_fd;
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136
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137 /* Figure out what our audio device is */
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138 if ((audiodev=getenv("SDL_PATH_DSP")) == NULL) {
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139 audiodev=getenv("AUDIODEV");
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140 }
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141 if ( audiodev == NULL ) {
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142 return -1;
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143 }
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144 audio_fd = open(audiodev, flags, 0);
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145 if ( path != NULL ) {
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146 strncpy(path, audiodev, maxlen);
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147 path[maxlen-1] = '\0';
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148 }
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149 return audio_fd;
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150 }
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151
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152 int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic)
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153 {
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154 struct stat sb;
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155 int audio_fd;
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156 char audiopath[1024];
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157 int cycle;
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158
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159 audio_fd = OpenUserDefinedDevice(path,maxlen,flags);
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160 if ( audio_fd != -1 ) {
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161 return audio_fd;
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162 }
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163
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164 cycle = 0;
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165 while( devsettings[cycle][0] != '\0' ) {
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166 sprintf( audiopath,
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167 _PATH_DEV_DSP,
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168 devsettings[cycle][0],
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169 devsettings[cycle][1],
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170 devsettings[cycle][2]);
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171
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172 if ( stat(audiopath, &sb) == 0 ) {
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173 audio_fd = open(audiopath, flags, 0);
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174 if ( audio_fd > 0 ) {
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175 if ( path != NULL ) {
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176 strncpy( path, audiopath, maxlen );
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177 path[maxlen-1] = '\0';
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178 }
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179 return audio_fd;
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180 }
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181 }
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182 }
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183 return -1;
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184 }
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185
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186 #endif /* UNIX system */