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annotate src/SDL_loadso.c @ 548:6cd49f896c5a

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Open ALSA devices in non-blocking mode (thanks Aleksey!)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 17 Nov 2002 20:02:26 +0000
parents 745873ea091f
children 35ff0890ac4e
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 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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29 /* System dependent library loading routines */
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30
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31 #include <stdio.h>
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32 #if defined(USE_DLOPEN)
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33 # include <dlfcn.h>
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34 #elif defined(WIN32)
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35 # include <windows.h>
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36 #elif defined(__BEOS__)
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37 # include <be/kernel/image.h>
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38 #elif defined(macintosh)
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39 # include <string.h>
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40 # include <Strings.h>
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41 # include <CodeFragments.h>
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42 # include <Errors.h>
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43 #else
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44 /*#error Unsupported dynamic link environment*/
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45 #endif /* system type */
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46
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47 #include "SDL_types.h"
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48 #include "SDL_error.h"
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49 #include "SDL_loadso.h"
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50
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51 void *SDL_LoadObject(const char *sofile)
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52 {
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53 void *handle = NULL;
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54 const char *loaderror = "SDL_LoadObject() not implemented";
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55 #if defined(USE_DLOPEN)
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56 /* * */
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57 handle = dlopen(sofile, RTLD_NOW);
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58 loaderror = (char *)dlerror();
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59 #elif defined(WIN32)
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60 /* * */
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61 char errbuf[512];
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62
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63 handle = (void *)LoadLibrary(sofile);
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64
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65 /* Generate an error message if all loads failed */
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66 if ( handle == NULL ) {
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67 FormatMessage((FORMAT_MESSAGE_IGNORE_INSERTS |
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68 FORMAT_MESSAGE_FROM_SYSTEM),
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69 NULL, GetLastError(),
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70 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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71 errbuf, SDL_TABLESIZE(errbuf), NULL);
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72 loaderror = errbuf;
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73 }
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74 #elif defined(__BEOS__)
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75 /* * */
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76 image_id library_id;
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77
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78 library_id = load_add_on(sofile);
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79 if ( library_id == B_ERROR ) {
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80 loaderror = "BeOS error";
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81 } else {
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82 handle = (void *)(library_id);
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83 }
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84 #elif defined(macintosh)
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85 /* * */
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86 CFragConnectionID library_id;
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87 Ptr mainAddr;
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88 Str255 errName;
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89 OSErr error;
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90 char psofile[512];
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91
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92 strncpy(psofile, sofile, SDL_TABLESIZE(psofile));
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93 psofile[SDL_TABLESIZE(psofile)-1] = '\0';
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94 error = GetSharedLibrary(C2PStr(psofile), kCompiledCFragArch,
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95 kLoadCFrag, &library_id, &mainAddr, errName);
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96 switch (error) {
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97 case noErr:
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98 break;
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99 case cfragNoLibraryErr:
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100 loaderror = "Library not found";
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101 break;
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102 case cfragUnresolvedErr:
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103 loaderror = "Unabled to resolve symbols";
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104 break;
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105 case cfragNoPrivateMemErr:
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106 case cfragNoClientMemErr:
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107 loaderror = "Out of memory";
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108 break;
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109 default:
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110 loaderror = "Unknown Code Fragment Manager error";
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111 break;
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112 }
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113 if ( loaderror == NULL ) {
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114 handle = (void *)(library_id);
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115 }
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116 #endif /* system type */
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117
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118 if ( handle == NULL ) {
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119 SDL_SetError("Failed loading %s: %s", sofile, loaderror);
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120 }
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121 return(handle);
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122 }
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123
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124 void *SDL_LoadFunction(void *handle, const char *name)
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125 {
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126 void *symbol = NULL;
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127 const char *loaderror = "SDL_LoadFunction not implemented";
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128 #if defined(USE_DLOPEN)
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129 /* * */
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130 symbol = dlsym(handle, name);
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131 if ( symbol == NULL ) {
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132 loaderror = (char *)dlerror();
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133 }
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134 #elif defined(WIN32)
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135 /* * */
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136 char errbuf[512];
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137
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138 symbol = (void *)GetProcAddress((HMODULE)handle, name);
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139 if ( symbol == NULL ) {
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140 FormatMessage((FORMAT_MESSAGE_IGNORE_INSERTS |
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141 FORMAT_MESSAGE_FROM_SYSTEM),
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142 NULL, GetLastError(),
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143 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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144 errbuf, SDL_TABLESIZE(errbuf), NULL);
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145 loaderror = errbuf;
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146 }
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147 #elif defined(__BEOS__)
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148 /* * */
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149 image_id library_id = (image_id)handle;
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150 if ( get_image_symbol(library_id,
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151 name, B_SYMBOL_TYPE_TEXT, &symbol) != B_NO_ERROR ) {
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152 loaderror = "Symbol not found";
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153 }
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154 #elif defined(macintosh)
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155 /* * */
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156 CFragSymbolClass class;
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157 CFragConnectionID library_id = (CFragConnectionID)handle;
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158 char pname[512];
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159
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160 strncpy(pname, name, SDL_TABLESIZE(pname));
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161 pname[SDL_TABLESIZE(pname)-1] = '\0';
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162 if ( FindSymbol(library_id, C2PStr(pname),
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163 (char **)&symbol, &class) != noErr ) {
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164 loaderror = "Symbol not found";
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165 }
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166 #endif /* system type */
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167
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168 if ( symbol == NULL ) {
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169 SDL_SetError("Failed loading %s: %s", name, loaderror);
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170 }
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171 return(symbol);
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172 }
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173
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174 void SDL_UnloadObject(void *handle)
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175 {
336
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176 #if defined(__BEOS__)
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177 image_id library_id;
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178 #endif
294
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179 if ( handle == NULL ) {
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180 return;
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181 }
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182 #if defined(USE_DLOPEN)
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183 /* * */
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184 dlclose(handle);
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185 #elif defined(WIN32)
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186 /* * */
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187 FreeLibrary((HMODULE)handle);
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188 #elif defined(__BEOS__)
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189 /* * */
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190 library_id = (image_id)handle;
294
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191 unload_add_on(library_id);
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192 #elif defined(macintosh)
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193 /* * */
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194 CFragConnectionID library_id = (CFragConnectionID)handle;
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195 CloseConnection(library_id);
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196 #endif /* system type */
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197 }