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annotate Python/dynload_beos.c @ 13255:916fb024ce94 legacy-trunk

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Change copyright notice.
author Guido van Rossum <guido@python.org>
date Fri, 30 Jun 2000 23:50:40 +0000
parents 528559a0b2f2
children 87ee82e5c56d
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
13255
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7 Copyright (c) 2000, BeOpen.com.
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8 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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9 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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10 All rights reserved.
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11
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12 See the file "Misc/COPYRIGHT" for information on usage and
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13 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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14
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15 ******************************************************************/
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16
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17 /* Support for dynamic loading of extension modules */
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18
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19 #include <kernel/image.h>
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20 #include <kernel/OS.h>
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21 #include <stdlib.h>
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22 #include <unistd.h>
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23
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24 #include "Python.h"
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25 #include "importdl.h"
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26
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27 const struct filedescr _PyImport_DynLoadFiletab[] = {
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28 {".so", "rb", C_EXTENSION},
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29 {"module.so", "rb", C_EXTENSION},
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30 {0, 0}
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31 };
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32
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33 #if defined(MAXPATHLEN) && !defined(_SYS_PARAM_H)
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34 #undef MAXPATHLEN
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35 #endif
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36
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37 #ifdef WITH_THREAD
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38 #include "pythread.h"
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39 static PyThread_type_lock beos_dyn_lock;
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40 #endif
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41
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42 static PyObject *beos_dyn_images = NULL;
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43
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44 /* ----------------------------------------------------------------------
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45 * BeOS dynamic loading support
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46 *
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47 * This uses shared libraries, but BeOS has its own way of doing things
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48 * (much easier than dlfnc.h, from the look of things). We'll use a
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49 * Python Dictionary object to store the images_ids so we can be very
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50 * nice and unload them when we exit.
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51 *
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52 * Note that this is thread-safe. Probably irrelevent, because of losing
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53 * systems... Python probably disables threads while loading modules.
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54 * Note the use of "probably"! Better to be safe than sorry. [chrish]
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55 *
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56 * As of 1.5.1 this should also work properly when you've configured
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57 * Python without thread support; the 1.5 version required it, which wasn't
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58 * very friendly. Note that I haven't tested it without threading... why
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59 * would you want to avoid threads on BeOS? [chrish]
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60 *
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61 * As of 1.5.2, the PyImport_BeImageID() function has been removed; Donn
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62 * tells me it's not necessary anymore because of PyCObject_Import().
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63 * [chrish]
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64 */
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65
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66 /* Whack an item; the item is an image_id in disguise, so we'll call
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67 * unload_add_on() for it.
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68 */
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69 static void beos_nuke_dyn( PyObject *item )
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70 {
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71 status_t retval;
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72
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73 if( item ) {
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74 image_id id = (image_id)PyInt_AsLong( item );
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75
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76 retval = unload_add_on( id );
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77 }
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78 }
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79
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80 /* atexit() handler that'll call unload_add_on() for every item in the
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81 * dictionary.
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82 */
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83 static void beos_cleanup_dyn( void )
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84 {
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85 if( beos_dyn_images ) {
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86 int idx;
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87 int list_size;
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88 PyObject *id_list;
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89
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90 #ifdef WITH_THREAD
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91 PyThread_acquire_lock( beos_dyn_lock, 1 );
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92 #endif
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93
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94 id_list = PyDict_Values( beos_dyn_images );
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95
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96 list_size = PyList_Size( id_list );
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97 for( idx = 0; idx < list_size; idx++ ) {
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98 PyObject *the_item;
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99
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100 the_item = PyList_GetItem( id_list, idx );
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101 beos_nuke_dyn( the_item );
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102 }
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103
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104 PyDict_Clear( beos_dyn_images );
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105
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106 #ifdef WITH_THREAD
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107 PyThread_free_lock( beos_dyn_lock );
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108 #endif
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109 }
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110 }
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111
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112 /*
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113 * Initialize our dictionary, and the dictionary mutex.
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114 */
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115 static void beos_init_dyn( void )
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116 {
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117 /* We're protected from a race condition here by the atomic init_count
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118 * variable.
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119 */
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120 static int32 init_count = 0;
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121 int32 val;
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122
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123 val = atomic_add( &init_count, 1 );
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124 if( beos_dyn_images == NULL && val == 0 ) {
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125 beos_dyn_images = PyDict_New();
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126 #ifdef WITH_THREAD
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127 beos_dyn_lock = PyThread_allocate_lock();
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128 #endif
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129 atexit( beos_cleanup_dyn );
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130 }
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131 }
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132
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133 /*
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134 * Add an image_id to the dictionary; the module name of the loaded image
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135 * is the key. Note that if the key is already in the dict, we unload
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136 * that image; this should allow reload() to work on dynamically loaded
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137 * modules (super-keen!).
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138 */
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139 static void beos_add_dyn( char *name, image_id id )
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140 {
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141 int retval;
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142 PyObject *py_id;
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143
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144 if( beos_dyn_images == NULL ) {
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145 beos_init_dyn();
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146 }
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147
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148 #ifdef WITH_THREAD
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149 retval = PyThread_acquire_lock( beos_dyn_lock, 1 );
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150 #endif
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151
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152 /* If there's already an object with this key in the dictionary,
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153 * we're doing a reload(), so let's nuke it.
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154 */
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155 py_id = PyDict_GetItemString( beos_dyn_images, name );
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156 if( py_id ) {
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157 beos_nuke_dyn( py_id );
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158 retval = PyDict_DelItemString( beos_dyn_images, name );
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159 }
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160
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161 py_id = PyInt_FromLong( (long)id );
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162 if( py_id ) {
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163 retval = PyDict_SetItemString( beos_dyn_images, name, py_id );
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164 }
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165
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166 #ifdef WITH_THREAD
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167 PyThread_release_lock( beos_dyn_lock );
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168 #endif
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169 }
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170
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171
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172
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173 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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174 const char *pathname, FILE *fp)
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175 {
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176 dl_funcptr p;
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177 image_id the_id;
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178 status_t retval;
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179 char fullpath[PATH_MAX];
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180 char funcname[258];
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181
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182 if( Py_VerboseFlag ) {
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183 printf( "load_add_on( %s )\n", pathname );
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184 }
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185
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186 /* Hmm, this old bug appears to have regenerated itself; if the
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187 * path isn't absolute, load_add_on() will fail. Reported to Be
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188 * April 21, 1998.
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189 */
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190 if( pathname[0] != '/' ) {
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191 (void)getcwd( fullpath, PATH_MAX );
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192 (void)strncat( fullpath, "/", PATH_MAX );
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193 (void)strncat( fullpath, pathname, PATH_MAX );
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194
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195 if( Py_VerboseFlag ) {
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196 printf( "load_add_on( %s )\n", fullpath );
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197 }
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198 } else {
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199 (void)strcpy( fullpath, pathname );
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200 }
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201
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202 the_id = load_add_on( fullpath );
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203 if( the_id < B_NO_ERROR ) {
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204 /* It's too bad load_add_on() doesn't set errno or something...
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205 */
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206 char buff[256]; /* hate hard-coded string sizes... */
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207
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208 if( Py_VerboseFlag ) {
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209 printf( "load_add_on( %s ) failed", fullpath );
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210 }
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211
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212 switch( the_id ) {
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213 case B_ERROR:
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214 sprintf( buff, "BeOS: Failed to load %.200s", fullpath );
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215 break;
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216 default:
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217 sprintf( buff, "Unknown error loading %.200s", fullpath );
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218 break;
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219 }
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220
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221 PyErr_SetString( PyExc_ImportError, buff );
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222 return NULL;
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223 }
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224
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225 sprintf(funcname, "init%.200s", shortname);
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226 if( Py_VerboseFlag ) {
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227 printf( "get_image_symbol( %s )\n", funcname );
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228 }
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229
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230 retval = get_image_symbol( the_id, funcname, B_SYMBOL_TYPE_TEXT, &p );
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231 if( retval != B_NO_ERROR || p == NULL ) {
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232 /* That's bad, we can't find that symbol in the module...
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233 */
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234 char buff[256]; /* hate hard-coded string sizes... */
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235
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236 if( Py_VerboseFlag ) {
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237 printf( "get_image_symbol( %s ) failed", funcname );
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238 }
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239
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240 switch( retval ) {
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241 case B_BAD_IMAGE_ID:
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242 sprintf( buff, "can't load init function for dynamic module: "
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243 "Invalid image ID for %.180s", fullpath );
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244 break;
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245 case B_BAD_INDEX:
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246 sprintf( buff, "can't load init function for dynamic module: "
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247 "Bad index for %.180s", funcname );
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248 break;
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249 default:
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250 sprintf( buff, "can't load init function for dynamic module: "
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251 "Unknown error looking up %.180s", funcname );
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252 break;
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253 }
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254
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255 retval = unload_add_on( the_id );
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256
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257 PyErr_SetString( PyExc_ImportError, buff );
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258 return NULL;
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259 }
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260
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261 /* Save the module name and image ID for later so we can clean up
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262 * gracefully.
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263 */
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264 beos_add_dyn( fqname, the_id );
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265
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266 return p;
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267 }