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annotate Python/dynload_beos.c @ 11865:2fa89e657a4e legacy-trunk

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Fix a typo in Barry's checkin. Reported both by Gerrit Holl and Mark Favas.
author Guido van Rossum <guido@python.org>
date Sun, 27 Feb 2000 15:35:47 +0000
parents 528559a0b2f2
children 916fb024ce94
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* Support for dynamic loading of extension modules */
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33
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34 #include <kernel/image.h>
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35 #include <kernel/OS.h>
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36 #include <stdlib.h>
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37 #include <unistd.h>
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38
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39 #include "Python.h"
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40 #include "importdl.h"
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41
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42 const struct filedescr _PyImport_DynLoadFiletab[] = {
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43 {".so", "rb", C_EXTENSION},
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44 {"module.so", "rb", C_EXTENSION},
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45 {0, 0}
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46 };
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47
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48 #if defined(MAXPATHLEN) && !defined(_SYS_PARAM_H)
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49 #undef MAXPATHLEN
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50 #endif
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51
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52 #ifdef WITH_THREAD
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53 #include "pythread.h"
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54 static PyThread_type_lock beos_dyn_lock;
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55 #endif
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56
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57 static PyObject *beos_dyn_images = NULL;
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58
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59 /* ----------------------------------------------------------------------
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60 * BeOS dynamic loading support
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61 *
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62 * This uses shared libraries, but BeOS has its own way of doing things
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63 * (much easier than dlfnc.h, from the look of things). We'll use a
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64 * Python Dictionary object to store the images_ids so we can be very
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65 * nice and unload them when we exit.
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66 *
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67 * Note that this is thread-safe. Probably irrelevent, because of losing
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68 * systems... Python probably disables threads while loading modules.
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69 * Note the use of "probably"! Better to be safe than sorry. [chrish]
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70 *
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71 * As of 1.5.1 this should also work properly when you've configured
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72 * Python without thread support; the 1.5 version required it, which wasn't
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73 * very friendly. Note that I haven't tested it without threading... why
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74 * would you want to avoid threads on BeOS? [chrish]
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75 *
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76 * As of 1.5.2, the PyImport_BeImageID() function has been removed; Donn
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77 * tells me it's not necessary anymore because of PyCObject_Import().
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78 * [chrish]
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79 */
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80
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81 /* Whack an item; the item is an image_id in disguise, so we'll call
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82 * unload_add_on() for it.
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83 */
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84 static void beos_nuke_dyn( PyObject *item )
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85 {
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86 status_t retval;
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87
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88 if( item ) {
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89 image_id id = (image_id)PyInt_AsLong( item );
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90
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91 retval = unload_add_on( id );
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92 }
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93 }
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94
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95 /* atexit() handler that'll call unload_add_on() for every item in the
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96 * dictionary.
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97 */
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98 static void beos_cleanup_dyn( void )
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99 {
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100 if( beos_dyn_images ) {
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101 int idx;
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102 int list_size;
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103 PyObject *id_list;
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104
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105 #ifdef WITH_THREAD
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106 PyThread_acquire_lock( beos_dyn_lock, 1 );
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107 #endif
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108
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109 id_list = PyDict_Values( beos_dyn_images );
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110
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111 list_size = PyList_Size( id_list );
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112 for( idx = 0; idx < list_size; idx++ ) {
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113 PyObject *the_item;
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114
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115 the_item = PyList_GetItem( id_list, idx );
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116 beos_nuke_dyn( the_item );
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117 }
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118
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119 PyDict_Clear( beos_dyn_images );
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120
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121 #ifdef WITH_THREAD
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122 PyThread_free_lock( beos_dyn_lock );
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123 #endif
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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 * Initialize our dictionary, and the dictionary mutex.
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129 */
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130 static void beos_init_dyn( void )
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131 {
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132 /* We're protected from a race condition here by the atomic init_count
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133 * variable.
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134 */
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135 static int32 init_count = 0;
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136 int32 val;
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137
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138 val = atomic_add( &init_count, 1 );
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139 if( beos_dyn_images == NULL && val == 0 ) {
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140 beos_dyn_images = PyDict_New();
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141 #ifdef WITH_THREAD
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142 beos_dyn_lock = PyThread_allocate_lock();
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143 #endif
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144 atexit( beos_cleanup_dyn );
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145 }
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146 }
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147
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148 /*
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149 * Add an image_id to the dictionary; the module name of the loaded image
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150 * is the key. Note that if the key is already in the dict, we unload
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151 * that image; this should allow reload() to work on dynamically loaded
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152 * modules (super-keen!).
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153 */
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154 static void beos_add_dyn( char *name, image_id id )
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155 {
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156 int retval;
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157 PyObject *py_id;
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158
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159 if( beos_dyn_images == NULL ) {
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160 beos_init_dyn();
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161 }
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162
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163 #ifdef WITH_THREAD
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164 retval = PyThread_acquire_lock( beos_dyn_lock, 1 );
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165 #endif
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166
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167 /* If there's already an object with this key in the dictionary,
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168 * we're doing a reload(), so let's nuke it.
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169 */
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170 py_id = PyDict_GetItemString( beos_dyn_images, name );
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171 if( py_id ) {
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172 beos_nuke_dyn( py_id );
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173 retval = PyDict_DelItemString( beos_dyn_images, name );
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174 }
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175
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176 py_id = PyInt_FromLong( (long)id );
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177 if( py_id ) {
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178 retval = PyDict_SetItemString( beos_dyn_images, name, py_id );
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179 }
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180
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181 #ifdef WITH_THREAD
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182 PyThread_release_lock( beos_dyn_lock );
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183 #endif
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184 }
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185
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186
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187
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188 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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189 const char *pathname, FILE *fp)
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190 {
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191 dl_funcptr p;
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192 image_id the_id;
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193 status_t retval;
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194 char fullpath[PATH_MAX];
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195 char funcname[258];
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196
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197 if( Py_VerboseFlag ) {
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198 printf( "load_add_on( %s )\n", pathname );
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199 }
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200
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201 /* Hmm, this old bug appears to have regenerated itself; if the
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202 * path isn't absolute, load_add_on() will fail. Reported to Be
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203 * April 21, 1998.
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204 */
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205 if( pathname[0] != '/' ) {
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206 (void)getcwd( fullpath, PATH_MAX );
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207 (void)strncat( fullpath, "/", PATH_MAX );
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208 (void)strncat( fullpath, pathname, PATH_MAX );
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209
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210 if( Py_VerboseFlag ) {
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211 printf( "load_add_on( %s )\n", fullpath );
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212 }
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213 } else {
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214 (void)strcpy( fullpath, pathname );
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215 }
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216
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217 the_id = load_add_on( fullpath );
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218 if( the_id < B_NO_ERROR ) {
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219 /* It's too bad load_add_on() doesn't set errno or something...
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220 */
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221 char buff[256]; /* hate hard-coded string sizes... */
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222
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223 if( Py_VerboseFlag ) {
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224 printf( "load_add_on( %s ) failed", fullpath );
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225 }
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226
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diff changeset
227 switch( the_id ) {
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228 case B_ERROR:
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229 sprintf( buff, "BeOS: Failed to load %.200s", fullpath );
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diff changeset
230 break;
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diff changeset
231 default:
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232 sprintf( buff, "Unknown error loading %.200s", fullpath );
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diff changeset
233 break;
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diff changeset
234 }
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235
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236 PyErr_SetString( PyExc_ImportError, buff );
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237 return NULL;
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238 }
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239
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240 sprintf(funcname, "init%.200s", shortname);
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241 if( Py_VerboseFlag ) {
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242 printf( "get_image_symbol( %s )\n", funcname );
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243 }
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244
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245 retval = get_image_symbol( the_id, funcname, B_SYMBOL_TYPE_TEXT, &p );
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246 if( retval != B_NO_ERROR || p == NULL ) {
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247 /* That's bad, we can't find that symbol in the module...
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248 */
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249 char buff[256]; /* hate hard-coded string sizes... */
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250
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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251 if( Py_VerboseFlag ) {
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252 printf( "get_image_symbol( %s ) failed", funcname );
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253 }
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254
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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diff changeset
255 switch( retval ) {
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256 case B_BAD_IMAGE_ID:
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diff changeset
257 sprintf( buff, "can't load init function for dynamic module: "
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258 "Invalid image ID for %.180s", fullpath );
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diff changeset
259 break;
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diff changeset
260 case B_BAD_INDEX:
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diff changeset
261 sprintf( buff, "can't load init function for dynamic module: "
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parents:
diff changeset
262 "Bad index for %.180s", funcname );
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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parents:
diff changeset
263 break;
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parents:
diff changeset
264 default:
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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diff changeset
265 sprintf( buff, "can't load init function for dynamic module: "
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parents:
diff changeset
266 "Unknown error looking up %.180s", funcname );
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Guido van Rossum <guido@python.org>
parents:
diff changeset
267 break;
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
268 }
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diff changeset
269
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diff changeset
270 retval = unload_add_on( the_id );
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diff changeset
271
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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diff changeset
272 PyErr_SetString( PyExc_ImportError, buff );
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diff changeset
273 return NULL;
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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diff changeset
274 }
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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diff changeset
275
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276 /* Save the module name and image ID for later so we can clean up
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277 * gracefully.
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278 */
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279 beos_add_dyn( fqname, the_id );
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280
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281 return p;
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282 }