Mercurial > cpython-lru_cache-weakref

annotate Python/dynload_beos.c @ 20737:00a581bdedeb legacy-trunk

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When overriding __str__ or __repr__, set the tp_print slot to NULL.
author Guido van Rossum <guido@python.org>
date Mon, 29 Oct 2001 14:33:44 +0000
parents 6f6f965c5e2d
children c5fbe92e02d3
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 #include <unistd.h>
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8
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9 #include "Python.h"
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10 #include "importdl.h"
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11
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12 const struct filedescr _PyImport_DynLoadFiletab[] = {
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13 {".so", "rb", C_EXTENSION},
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14 {"module.so", "rb", C_EXTENSION},
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15 {0, 0}
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16 };
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17
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18 #if defined(MAXPATHLEN) && !defined(_SYS_PARAM_H)
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19 #undef MAXPATHLEN
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20 #endif
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21
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22 #ifdef WITH_THREAD
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23 #include "pythread.h"
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24 static PyThread_type_lock beos_dyn_lock;
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25 #endif
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26
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27 static PyObject *beos_dyn_images = NULL;
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28
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29 /* ----------------------------------------------------------------------
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30 * BeOS dynamic loading support
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31 *
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32 * This uses shared libraries, but BeOS has its own way of doing things
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33 * (much easier than dlfnc.h, from the look of things). We'll use a
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34 * Python Dictionary object to store the images_ids so we can be very
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35 * nice and unload them when we exit.
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36 *
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37 * Note that this is thread-safe. Probably irrelevent, because of losing
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38 * systems... Python probably disables threads while loading modules.
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39 * Note the use of "probably"! Better to be safe than sorry. [chrish]
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40 *
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41 * As of 1.5.1 this should also work properly when you've configured
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42 * Python without thread support; the 1.5 version required it, which wasn't
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43 * very friendly. Note that I haven't tested it without threading... why
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44 * would you want to avoid threads on BeOS? [chrish]
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45 *
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46 * As of 1.5.2, the PyImport_BeImageID() function has been removed; Donn
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47 * tells me it's not necessary anymore because of PyCObject_Import().
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48 * [chrish]
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49 */
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50
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51 /* Whack an item; the item is an image_id in disguise, so we'll call
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52 * unload_add_on() for it.
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53 */
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54 static void beos_nuke_dyn( PyObject *item )
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55 {
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56 status_t retval;
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57
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58 if( item ) {
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59 image_id id = (image_id)PyInt_AsLong( item );
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60
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61 retval = unload_add_on( id );
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62 }
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63 }
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64
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65 /* atexit() handler that'll call unload_add_on() for every item in the
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66 * dictionary.
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67 */
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68 static void beos_cleanup_dyn( void )
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69 {
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70 if( beos_dyn_images ) {
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71 int idx;
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72 int list_size;
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73 PyObject *id_list;
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74
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75 #ifdef WITH_THREAD
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76 PyThread_acquire_lock( beos_dyn_lock, 1 );
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77 #endif
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78
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79 id_list = PyDict_Values( beos_dyn_images );
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80
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81 list_size = PyList_Size( id_list );
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82 for( idx = 0; idx < list_size; idx++ ) {
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83 PyObject *the_item;
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84
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85 the_item = PyList_GetItem( id_list, idx );
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86 beos_nuke_dyn( the_item );
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87 }
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88
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89 PyDict_Clear( beos_dyn_images );
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90
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91 #ifdef WITH_THREAD
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92 PyThread_free_lock( beos_dyn_lock );
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93 #endif
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94 }
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95 }
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96
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97 /*
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98 * Initialize our dictionary, and the dictionary mutex.
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99 */
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100 static void beos_init_dyn( void )
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101 {
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102 /* We're protected from a race condition here by the atomic init_count
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103 * variable.
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104 */
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105 static int32 init_count = 0;
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106 int32 val;
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107
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108 val = atomic_add( &init_count, 1 );
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109 if( beos_dyn_images == NULL && val == 0 ) {
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110 beos_dyn_images = PyDict_New();
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111 #ifdef WITH_THREAD
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112 beos_dyn_lock = PyThread_allocate_lock();
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113 #endif
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114 atexit( beos_cleanup_dyn );
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115 }
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116 }
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117
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118 /*
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119 * Add an image_id to the dictionary; the module name of the loaded image
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120 * is the key. Note that if the key is already in the dict, we unload
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121 * that image; this should allow reload() to work on dynamically loaded
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122 * modules (super-keen!).
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123 */
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124 static void beos_add_dyn( char *name, image_id id )
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125 {
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126 int retval;
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127 PyObject *py_id;
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128
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129 if( beos_dyn_images == NULL ) {
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130 beos_init_dyn();
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131 }
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132
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133 #ifdef WITH_THREAD
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134 retval = PyThread_acquire_lock( beos_dyn_lock, 1 );
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135 #endif
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136
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137 /* If there's already an object with this key in the dictionary,
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138 * we're doing a reload(), so let's nuke it.
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139 */
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140 py_id = PyDict_GetItemString( beos_dyn_images, name );
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141 if( py_id ) {
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142 beos_nuke_dyn( py_id );
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143 retval = PyDict_DelItemString( beos_dyn_images, name );
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144 }
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145
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146 py_id = PyInt_FromLong( (long)id );
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147 if( py_id ) {
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148 retval = PyDict_SetItemString( beos_dyn_images, name, py_id );
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149 }
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150
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151 #ifdef WITH_THREAD
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152 PyThread_release_lock( beos_dyn_lock );
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153 #endif
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154 }
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155
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156
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157
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158 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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159 const char *pathname, FILE *fp)
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160 {
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161 dl_funcptr p;
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162 image_id the_id;
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163 status_t retval;
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164 char fullpath[PATH_MAX];
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165 char funcname[258];
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166
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167 if( Py_VerboseFlag ) {
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168 printf( "load_add_on( %s )\n", pathname );
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169 }
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170
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171 /* Hmm, this old bug appears to have regenerated itself; if the
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172 * path isn't absolute, load_add_on() will fail. Reported to Be
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173 * April 21, 1998.
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174 */
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175 if( pathname[0] != '/' ) {
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176 (void)getcwd( fullpath, PATH_MAX );
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177 (void)strncat( fullpath, "/", PATH_MAX );
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178 (void)strncat( fullpath, pathname, PATH_MAX );
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179
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180 if( Py_VerboseFlag ) {
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181 printf( "load_add_on( %s )\n", fullpath );
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182 }
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183 } else {
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184 (void)strcpy( fullpath, pathname );
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185 }
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186
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187 the_id = load_add_on( fullpath );
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188 if( the_id < B_NO_ERROR ) {
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189 /* It's too bad load_add_on() doesn't set errno or something...
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190 */
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191 char buff[256]; /* hate hard-coded string sizes... */
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192
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193 if( Py_VerboseFlag ) {
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194 printf( "load_add_on( %s ) failed", fullpath );
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195 }
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196
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197 switch( the_id ) {
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198 case B_ERROR:
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199 sprintf( buff, "BeOS: Failed to load %.200s", fullpath );
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200 break;
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201 default:
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202 sprintf( buff, "Unknown error loading %.200s", fullpath );
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203 break;
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204 }
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205
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206 PyErr_SetString( PyExc_ImportError, buff );
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207 return NULL;
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208 }
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209
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210 sprintf(funcname, "init%.200s", shortname);
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211 if( Py_VerboseFlag ) {
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212 printf( "get_image_symbol( %s )\n", funcname );
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213 }
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214
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215 retval = get_image_symbol( the_id, funcname, B_SYMBOL_TYPE_TEXT, &p );
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216 if( retval != B_NO_ERROR || p == NULL ) {
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217 /* That's bad, we can't find that symbol in the module...
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218 */
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219 char buff[256]; /* hate hard-coded string sizes... */
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220
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221 if( Py_VerboseFlag ) {
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222 printf( "get_image_symbol( %s ) failed", funcname );
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223 }
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224
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225 switch( retval ) {
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226 case B_BAD_IMAGE_ID:
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227 sprintf( buff, "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 sprintf( buff, "can't load init function for dynamic module: "
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232 "Bad index for %.180s", funcname );
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233 break;
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234 default:
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235 sprintf( buff, "can't load init function for dynamic module: "
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236 "Unknown error looking up %.180s", funcname );
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237 break;
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238 }
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239
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240 retval = unload_add_on( the_id );
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241
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242 PyErr_SetString( PyExc_ImportError, buff );
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243 return NULL;
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244 }
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245
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246 /* Save the module name and image ID for later so we can clean up
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247 * gracefully.
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248 */
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249 beos_add_dyn( fqname, the_id );
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250
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251 return p;
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252 }