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annotate Python/dynload_beos.c @ 49955:878d40468c4e legacy-trunk

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Issue #4384: Added logging integration with warnings module using captureWarnings(). This change includes a NullHandler which does nothing; it will be of use to library developers who want to avoid the "No handlers could be found for logger XXX" message which can appear if the library user doesn't configure logging.
author Vinay Sajip <vinay_sajip@yahoo.co.uk>
date Wed, 03 Dec 2008 23:22:58 +0000
parents 6a8c46d8212b
children fd25030223b0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* Support for dynamic loading of extension modules */
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3
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4 #include <kernel/image.h>
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5 #include <kernel/OS.h>
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6 #include <stdlib.h>
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7
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8 #include "Python.h"
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9 #include "importdl.h"
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10
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11 const struct filedescr _PyImport_DynLoadFiletab[] = {
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12 {".so", "rb", C_EXTENSION},
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13 {"module.so", "rb", C_EXTENSION},
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14 {0, 0}
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15 };
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16
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17 #if defined(MAXPATHLEN) && !defined(_SYS_PARAM_H)
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18 #undef MAXPATHLEN
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19 #endif
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20
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21 #ifdef WITH_THREAD
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22 #include "pythread.h"
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23 static PyThread_type_lock beos_dyn_lock;
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24 #endif
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25
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26 static PyObject *beos_dyn_images = NULL;
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27
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28 /* ----------------------------------------------------------------------
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29 * BeOS dynamic loading support
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30 *
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31 * This uses shared libraries, but BeOS has its own way of doing things
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32 * (much easier than dlfnc.h, from the look of things). We'll use a
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33 * Python Dictionary object to store the images_ids so we can be very
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34 * nice and unload them when we exit.
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35 *
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36 * Note that this is thread-safe. Probably irrelevent, because of losing
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37 * systems... Python probably disables threads while loading modules.
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38 * Note the use of "probably"! Better to be safe than sorry. [chrish]
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39 *
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40 * As of 1.5.1 this should also work properly when you've configured
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41 * Python without thread support; the 1.5 version required it, which wasn't
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42 * very friendly. Note that I haven't tested it without threading... why
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43 * would you want to avoid threads on BeOS? [chrish]
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44 *
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45 * As of 1.5.2, the PyImport_BeImageID() function has been removed; Donn
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46 * tells me it's not necessary anymore because of PyCObject_Import().
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47 * [chrish]
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48 */
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49
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50 /* Whack an item; the item is an image_id in disguise, so we'll call
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51 * unload_add_on() for it.
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52 */
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53 static void beos_nuke_dyn( PyObject *item )
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54 {
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55 status_t retval;
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56
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57 if( item ) {
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58 image_id id = (image_id)PyInt_AsLong( item );
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59
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60 retval = unload_add_on( id );
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61 }
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62 }
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63
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64 /* atexit() handler that'll call unload_add_on() for every item in the
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65 * dictionary.
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66 */
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67 static void beos_cleanup_dyn( void )
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68 {
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69 if( beos_dyn_images ) {
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70 int idx;
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71 int list_size;
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72 PyObject *id_list;
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73
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74 #ifdef WITH_THREAD
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75 PyThread_acquire_lock( beos_dyn_lock, 1 );
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76 #endif
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77
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78 id_list = PyDict_Values( beos_dyn_images );
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79
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80 list_size = PyList_Size( id_list );
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81 for( idx = 0; idx < list_size; idx++ ) {
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82 PyObject *the_item;
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83
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84 the_item = PyList_GetItem( id_list, idx );
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85 beos_nuke_dyn( the_item );
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86 }
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87
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88 PyDict_Clear( beos_dyn_images );
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89
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90 #ifdef WITH_THREAD
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91 PyThread_free_lock( beos_dyn_lock );
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92 #endif
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93 }
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94 }
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95
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96 /*
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97 * Initialize our dictionary, and the dictionary mutex.
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98 */
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99 static void beos_init_dyn( void )
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100 {
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101 /* We're protected from a race condition here by the atomic init_count
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102 * variable.
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103 */
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104 static int32 init_count = 0;
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105 int32 val;
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106
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107 val = atomic_add( &init_count, 1 );
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108 if( beos_dyn_images == NULL && val == 0 ) {
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109 beos_dyn_images = PyDict_New();
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110 #ifdef WITH_THREAD
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111 beos_dyn_lock = PyThread_allocate_lock();
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112 #endif
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113 atexit( beos_cleanup_dyn );
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114 }
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115 }
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116
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117 /*
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118 * Add an image_id to the dictionary; the module name of the loaded image
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119 * is the key. Note that if the key is already in the dict, we unload
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120 * that image; this should allow reload() to work on dynamically loaded
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121 * modules (super-keen!).
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122 */
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123 static void beos_add_dyn( char *name, image_id id )
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124 {
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125 int retval;
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126 PyObject *py_id;
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127
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128 if( beos_dyn_images == NULL ) {
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129 beos_init_dyn();
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130 }
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131
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132 #ifdef WITH_THREAD
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133 retval = PyThread_acquire_lock( beos_dyn_lock, 1 );
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134 #endif
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135
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136 /* If there's already an object with this key in the dictionary,
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137 * we're doing a reload(), so let's nuke it.
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138 */
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139 py_id = PyDict_GetItemString( beos_dyn_images, name );
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140 if( py_id ) {
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141 beos_nuke_dyn( py_id );
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142 retval = PyDict_DelItemString( beos_dyn_images, name );
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143 }
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144
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145 py_id = PyInt_FromLong( (long)id );
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146 if( py_id ) {
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147 retval = PyDict_SetItemString( beos_dyn_images, name, py_id );
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148 }
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149
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150 #ifdef WITH_THREAD
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151 PyThread_release_lock( beos_dyn_lock );
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152 #endif
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153 }
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154
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155
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156
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157 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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158 const char *pathname, FILE *fp)
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159 {
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160 dl_funcptr p;
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161 image_id the_id;
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162 status_t retval;
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163 char fullpath[PATH_MAX];
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164 char funcname[258];
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165
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166 if( Py_VerboseFlag ) {
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167 printf( "load_add_on( %s )\n", pathname );
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168 }
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169
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170 /* Hmm, this old bug appears to have regenerated itself; if the
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171 * path isn't absolute, load_add_on() will fail. Reported to Be
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172 * April 21, 1998.
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173 */
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174 if( pathname[0] != '/' ) {
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175 (void)getcwd( fullpath, PATH_MAX );
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176 (void)strncat( fullpath, "/", PATH_MAX );
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177 (void)strncat( fullpath, pathname, PATH_MAX );
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178
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179 if( Py_VerboseFlag ) {
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180 printf( "load_add_on( %s )\n", fullpath );
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181 }
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182 } else {
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183 (void)strcpy( fullpath, pathname );
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184 }
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185
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186 the_id = load_add_on( fullpath );
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187 if( the_id < B_NO_ERROR ) {
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188 /* It's too bad load_add_on() doesn't set errno or something...
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189 */
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190 char buff[256]; /* hate hard-coded string sizes... */
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191
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192 if( Py_VerboseFlag ) {
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193 printf( "load_add_on( %s ) failed", fullpath );
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194 }
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195
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196 if( the_id == B_ERROR )
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197 PyOS_snprintf( buff, sizeof(buff),
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198 "BeOS: Failed to load %.200s",
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199 fullpath );
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200 else
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201 PyOS_snprintf( buff, sizeof(buff),
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202 "Unknown error loading %.200s",
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203 fullpath );
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204
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205 PyErr_SetString( PyExc_ImportError, buff );
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206 return NULL;
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207 }
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208
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209 PyOS_snprintf(funcname, sizeof(funcname), "init%.200s", shortname);
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210 if( Py_VerboseFlag ) {
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211 printf( "get_image_symbol( %s )\n", funcname );
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212 }
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213
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214 retval = get_image_symbol( the_id, funcname, B_SYMBOL_TYPE_TEXT, &p );
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215 if( retval != B_NO_ERROR || p == NULL ) {
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216 /* That's bad, we can't find that symbol in the module...
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217 */
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218 char buff[256]; /* hate hard-coded string sizes... */
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219
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220 if( Py_VerboseFlag ) {
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221 printf( "get_image_symbol( %s ) failed", funcname );
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222 }
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223
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224 switch( retval ) {
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225 case B_BAD_IMAGE_ID:
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226 PyOS_snprintf( buff, sizeof(buff),
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227 "can't load init function for dynamic module: "
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228 "Invalid image ID for %.180s", fullpath );
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229 break;
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230 case B_BAD_INDEX:
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231 PyOS_snprintf( buff, sizeof(buff),
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232 "can't load init function for dynamic module: "
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233 "Bad index for %.180s", funcname );
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234 break;
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235 default:
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236 PyOS_snprintf( buff, sizeof(buff),
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237 "can't load init function for dynamic module: "
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238 "Unknown error looking up %.180s", funcname );
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239 break;
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240 }
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241
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242 retval = unload_add_on( the_id );
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243
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244 PyErr_SetString( PyExc_ImportError, buff );
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245 return NULL;
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246 }
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247
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248 /* Save the module name and image ID for later so we can clean up
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249 * gracefully.
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250 */
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251 beos_add_dyn( fqname, the_id );
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252
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253 return p;
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254 }