Mercurial > cpython-lru_cache-weakref

annotate Python/dynload_beos.c @ 13778:f6e4a9dd67cd legacy-trunk

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Rename the "parser" package to "parsers" to be compatible with the PyXML project.
author Fred Drake <fdrake@acm.org>
date Mon, 31 Jul 2000 23:59:54 +0000
parents 87ee82e5c56d
children 6f6f965c5e2d
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1 /***********************************************************
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2 Copyright (c) 2000, BeOpen.com.
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3 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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4 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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5 All rights reserved.
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6
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7 See the file "Misc/COPYRIGHT" for information on usage and
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8 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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9 ******************************************************************/
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10
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11 /* Support for dynamic loading of extension modules */
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12
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13 #include <kernel/image.h>
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14 #include <kernel/OS.h>
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15 #include <stdlib.h>
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16 #include <unistd.h>
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17
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18 #include "Python.h"
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19 #include "importdl.h"
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20
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21 const struct filedescr _PyImport_DynLoadFiletab[] = {
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22 {".so", "rb", C_EXTENSION},
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23 {"module.so", "rb", C_EXTENSION},
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24 {0, 0}
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25 };
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26
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27 #if defined(MAXPATHLEN) && !defined(_SYS_PARAM_H)
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28 #undef MAXPATHLEN
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29 #endif
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30
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31 #ifdef WITH_THREAD
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32 #include "pythread.h"
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33 static PyThread_type_lock beos_dyn_lock;
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34 #endif
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35
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36 static PyObject *beos_dyn_images = NULL;
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37
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38 /* ----------------------------------------------------------------------
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39 * BeOS dynamic loading support
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40 *
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41 * This uses shared libraries, but BeOS has its own way of doing things
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42 * (much easier than dlfnc.h, from the look of things). We'll use a
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43 * Python Dictionary object to store the images_ids so we can be very
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44 * nice and unload them when we exit.
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45 *
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46 * Note that this is thread-safe. Probably irrelevent, because of losing
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47 * systems... Python probably disables threads while loading modules.
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48 * Note the use of "probably"! Better to be safe than sorry. [chrish]
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49 *
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50 * As of 1.5.1 this should also work properly when you've configured
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51 * Python without thread support; the 1.5 version required it, which wasn't
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52 * very friendly. Note that I haven't tested it without threading... why
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53 * would you want to avoid threads on BeOS? [chrish]
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54 *
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55 * As of 1.5.2, the PyImport_BeImageID() function has been removed; Donn
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56 * tells me it's not necessary anymore because of PyCObject_Import().
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57 * [chrish]
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58 */
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59
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60 /* Whack an item; the item is an image_id in disguise, so we'll call
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61 * unload_add_on() for it.
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62 */
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63 static void beos_nuke_dyn( PyObject *item )
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64 {
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65 status_t retval;
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66
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67 if( item ) {
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68 image_id id = (image_id)PyInt_AsLong( item );
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69
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70 retval = unload_add_on( id );
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71 }
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72 }
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73
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74 /* atexit() handler that'll call unload_add_on() for every item in the
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75 * dictionary.
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76 */
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77 static void beos_cleanup_dyn( void )
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78 {
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79 if( beos_dyn_images ) {
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80 int idx;
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81 int list_size;
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82 PyObject *id_list;
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83
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84 #ifdef WITH_THREAD
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85 PyThread_acquire_lock( beos_dyn_lock, 1 );
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86 #endif
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87
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88 id_list = PyDict_Values( beos_dyn_images );
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89
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90 list_size = PyList_Size( id_list );
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91 for( idx = 0; idx < list_size; idx++ ) {
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92 PyObject *the_item;
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93
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94 the_item = PyList_GetItem( id_list, idx );
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95 beos_nuke_dyn( the_item );
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96 }
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97
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98 PyDict_Clear( beos_dyn_images );
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99
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100 #ifdef WITH_THREAD
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101 PyThread_free_lock( beos_dyn_lock );
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102 #endif
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103 }
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104 }
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105
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106 /*
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107 * Initialize our dictionary, and the dictionary mutex.
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108 */
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109 static void beos_init_dyn( void )
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110 {
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111 /* We're protected from a race condition here by the atomic init_count
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112 * variable.
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113 */
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114 static int32 init_count = 0;
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115 int32 val;
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116
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117 val = atomic_add( &init_count, 1 );
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118 if( beos_dyn_images == NULL && val == 0 ) {
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119 beos_dyn_images = PyDict_New();
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120 #ifdef WITH_THREAD
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121 beos_dyn_lock = PyThread_allocate_lock();
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122 #endif
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123 atexit( beos_cleanup_dyn );
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124 }
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125 }
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126
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127 /*
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128 * Add an image_id to the dictionary; the module name of the loaded image
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129 * is the key. Note that if the key is already in the dict, we unload
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130 * that image; this should allow reload() to work on dynamically loaded
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131 * modules (super-keen!).
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132 */
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133 static void beos_add_dyn( char *name, image_id id )
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134 {
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135 int retval;
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136 PyObject *py_id;
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137
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138 if( beos_dyn_images == NULL ) {
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139 beos_init_dyn();
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140 }
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141
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142 #ifdef WITH_THREAD
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143 retval = PyThread_acquire_lock( beos_dyn_lock, 1 );
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144 #endif
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145
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146 /* If there's already an object with this key in the dictionary,
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147 * we're doing a reload(), so let's nuke it.
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148 */
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149 py_id = PyDict_GetItemString( beos_dyn_images, name );
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150 if( py_id ) {
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151 beos_nuke_dyn( py_id );
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152 retval = PyDict_DelItemString( beos_dyn_images, name );
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153 }
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154
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155 py_id = PyInt_FromLong( (long)id );
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156 if( py_id ) {
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157 retval = PyDict_SetItemString( beos_dyn_images, name, py_id );
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158 }
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159
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160 #ifdef WITH_THREAD
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161 PyThread_release_lock( beos_dyn_lock );
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162 #endif
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163 }
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164
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165
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166
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167 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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168 const char *pathname, FILE *fp)
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169 {
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170 dl_funcptr p;
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171 image_id the_id;
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172 status_t retval;
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173 char fullpath[PATH_MAX];
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174 char funcname[258];
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175
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176 if( Py_VerboseFlag ) {
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177 printf( "load_add_on( %s )\n", pathname );
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178 }
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179
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180 /* Hmm, this old bug appears to have regenerated itself; if the
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181 * path isn't absolute, load_add_on() will fail. Reported to Be
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182 * April 21, 1998.
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183 */
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184 if( pathname[0] != '/' ) {
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185 (void)getcwd( fullpath, PATH_MAX );
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186 (void)strncat( fullpath, "/", PATH_MAX );
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187 (void)strncat( fullpath, pathname, PATH_MAX );
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188
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189 if( Py_VerboseFlag ) {
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190 printf( "load_add_on( %s )\n", fullpath );
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191 }
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192 } else {
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193 (void)strcpy( fullpath, pathname );
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194 }
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195
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196 the_id = load_add_on( fullpath );
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197 if( the_id < B_NO_ERROR ) {
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198 /* It's too bad load_add_on() doesn't set errno or something...
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199 */
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200 char buff[256]; /* hate hard-coded string sizes... */
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201
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202 if( Py_VerboseFlag ) {
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203 printf( "load_add_on( %s ) failed", fullpath );
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204 }
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205
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206 switch( the_id ) {
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207 case B_ERROR:
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208 sprintf( buff, "BeOS: Failed to load %.200s", fullpath );
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209 break;
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210 default:
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211 sprintf( buff, "Unknown error loading %.200s", fullpath );
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212 break;
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213 }
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214
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215 PyErr_SetString( PyExc_ImportError, buff );
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216 return NULL;
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217 }
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218
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219 sprintf(funcname, "init%.200s", shortname);
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220 if( Py_VerboseFlag ) {
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221 printf( "get_image_symbol( %s )\n", funcname );
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222 }
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223
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224 retval = get_image_symbol( the_id, funcname, B_SYMBOL_TYPE_TEXT, &p );
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225 if( retval != B_NO_ERROR || p == NULL ) {
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226 /* That's bad, we can't find that symbol in the module...
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227 */
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228 char buff[256]; /* hate hard-coded string sizes... */
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229
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230 if( Py_VerboseFlag ) {
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231 printf( "get_image_symbol( %s ) failed", funcname );
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232 }
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233
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234 switch( retval ) {
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235 case B_BAD_IMAGE_ID:
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236 sprintf( buff, "can't load init function for dynamic module: "
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237 "Invalid image ID for %.180s", fullpath );
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238 break;
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239 case B_BAD_INDEX:
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240 sprintf( buff, "can't load init function for dynamic module: "
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241 "Bad index for %.180s", funcname );
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242 break;
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243 default:
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244 sprintf( buff, "can't load init function for dynamic module: "
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245 "Unknown error looking up %.180s", funcname );
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246 break;
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247 }
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248
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249 retval = unload_add_on( the_id );
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250
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251 PyErr_SetString( PyExc_ImportError, buff );
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252 return NULL;
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253 }
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254
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255 /* Save the module name and image ID for later so we can clean up
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256 * gracefully.
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257 */
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258 beos_add_dyn( fqname, the_id );
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259
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260 return p;
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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261 }