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33b34c43 PP |
1 | /* |
2 | * plugin.c | |
3 | * | |
4 | * Babeltrace Plugin | |
5 | * | |
6 | * Copyright 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
7 | * Copyright 2017 Philippe Proulx <pproulx@efficios.com> | |
8 | * | |
9 | * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
10 | * | |
11 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
12 | * of this software and associated documentation files (the "Software"), to deal | |
13 | * in the Software without restriction, including without limitation the rights | |
14 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
15 | * copies of the Software, and to permit persons to whom the Software is | |
16 | * furnished to do so, subject to the following conditions: | |
17 | * | |
18 | * The above copyright notice and this permission notice shall be included in | |
19 | * all copies or substantial portions of the Software. | |
20 | * | |
21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
22 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
23 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
24 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
25 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
26 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
27 | * SOFTWARE. | |
28 | */ | |
29 | ||
30 | #include <babeltrace/compiler.h> | |
31 | #include <babeltrace/ref.h> | |
32 | #include <babeltrace/plugin/plugin-dev.h> | |
33 | #include <babeltrace/plugin/plugin-internal.h> | |
34 | #include <babeltrace/component/component-class-internal.h> | |
35 | #include <string.h> | |
36 | #include <stdbool.h> | |
37 | #include <glib.h> | |
38 | #include <gmodule.h> | |
39 | #include <unistd.h> | |
40 | #include <stdlib.h> | |
41 | #include <sys/stat.h> | |
42 | #include <dirent.h> | |
43 | ||
33b34c43 PP |
44 | #define NATIVE_PLUGIN_SUFFIX ".so" |
45 | #define NATIVE_PLUGIN_SUFFIX_LEN sizeof(NATIVE_PLUGIN_SUFFIX) | |
46 | #define LIBTOOL_PLUGIN_SUFFIX ".la" | |
47 | #define LIBTOOL_PLUGIN_SUFFIX_LEN sizeof(LIBTOOL_PLUGIN_SUFFIX) | |
48 | ||
49 | #define PLUGIN_SUFFIX_LEN max_t(size_t, sizeof(NATIVE_PLUGIN_SUFFIX), \ | |
50 | sizeof(LIBTOOL_PLUGIN_SUFFIX)) | |
51 | ||
6ba0b073 PP |
52 | #define SECTION_BEGIN(_name) (&(__start_##_name)) |
53 | #define SECTION_END(_name) (&(__stop_##_name)) | |
33b34c43 PP |
54 | #define SECTION_ELEMENT_COUNT(_name) (SECTION_END(_name) - SECTION_BEGIN(_name)) |
55 | ||
56 | #define DECLARE_SECTION(_type, _name) \ | |
6ba0b073 PP |
57 | extern _type __start_##_name __attribute((weak)); \ |
58 | extern _type __stop_##_name __attribute((weak)) | |
59 | ||
60 | DECLARE_SECTION(struct __bt_plugin_descriptor const *, __bt_plugin_descriptors); | |
61 | DECLARE_SECTION(struct __bt_plugin_descriptor_attribute const *, __bt_plugin_descriptor_attributes); | |
62 | DECLARE_SECTION(struct __bt_plugin_component_class_descriptor const *, __bt_plugin_component_class_descriptors); | |
63 | DECLARE_SECTION(struct __bt_plugin_component_class_descriptor_attribute const *, __bt_plugin_component_class_descriptor_attributes); | |
33b34c43 PP |
64 | |
65 | /* | |
66 | * This hash table, global to the library, maps component class pointers | |
67 | * to shared library handles. | |
68 | * | |
69 | * The keys (component classes) are NOT owned by this hash table, whereas | |
70 | * the values (shared library handles) are owned by this hash table. | |
71 | * | |
72 | * The keys are the component classes created with | |
73 | * bt_plugin_add_component_class(). They keep the shared library handle | |
74 | * object created by their plugin alive so that the plugin's code is | |
75 | * not discarded when it could still be in use by living components | |
76 | * created from those component classes: | |
77 | * | |
78 | * [component] --ref-> [component class] --through this HT-> [shlib handle] | |
79 | * | |
80 | * This hash table exists for two reasons: | |
81 | * | |
82 | * 1. To allow this application: | |
83 | * | |
6ba0b073 PP |
84 | * my_plugins = bt_plugin_create_all_from_file("/path/to/my-plugin.so"); |
85 | * // instantiate components from a plugin's component classes | |
86 | * // put plugins and free my_plugins here | |
33b34c43 PP |
87 | * // user code of instantiated components still exists |
88 | * | |
89 | * 2. To decouple the plugin subsystem from the component subsystem: | |
90 | * while plugins objects need to know component class objects, the | |
91 | * opposite is not necessary, thus it makes no sense for a component | |
92 | * class to keep a reference to the plugin object from which it was | |
93 | * created. | |
94 | * | |
95 | * An entry is removed from this HT when a component class is destroyed | |
96 | * thanks to a custom destroy listener. When the entry is removed, the | |
97 | * GLib function calls the value destroy notifier of the HT, which is | |
98 | * bt_put(). This decreases the reference count of the mapped shared | |
99 | * library handle. Assuming the original plugin object which contained | |
100 | * some component classes is put first, when the last component class is | |
101 | * removed from this HT, the shared library handle object's reference | |
102 | * count falls to zero and the shared library is finally closed. | |
103 | */ | |
104 | static | |
105 | GHashTable *comp_classes_to_shlib_handles; | |
106 | ||
107 | __attribute__((constructor)) static | |
108 | void init_comp_classes_to_shlib_handles(void) { | |
109 | comp_classes_to_shlib_handles = g_hash_table_new_full(g_direct_hash, | |
110 | g_direct_equal, NULL, bt_put); | |
111 | assert(comp_classes_to_shlib_handles); | |
112 | } | |
113 | ||
114 | __attribute__((destructor)) static | |
115 | void fini_comp_classes_to_shlib_handles(void) { | |
116 | if (comp_classes_to_shlib_handles) { | |
117 | g_hash_table_destroy(comp_classes_to_shlib_handles); | |
118 | } | |
119 | } | |
120 | ||
121 | static | |
122 | void bt_plugin_shared_lib_handle_destroy(struct bt_object *obj) | |
123 | { | |
124 | struct bt_plugin_shared_lib_handle *shared_lib_handle; | |
125 | ||
126 | assert(obj); | |
127 | shared_lib_handle = container_of(obj, | |
128 | struct bt_plugin_shared_lib_handle, base); | |
129 | ||
130 | if (shared_lib_handle->init_called && shared_lib_handle->exit) { | |
131 | enum bt_plugin_status status = shared_lib_handle->exit(); | |
132 | ||
133 | if (status < 0) { | |
6ba0b073 PP |
134 | const char *path = shared_lib_handle->path ? |
135 | shared_lib_handle->path->str : "[built-in]"; | |
136 | ||
137 | printf_verbose("Plugin in module `%s` exited with error %d\n", | |
138 | path, status); | |
33b34c43 PP |
139 | } |
140 | } | |
141 | ||
142 | if (shared_lib_handle->module) { | |
143 | if (!g_module_close(shared_lib_handle->module)) { | |
144 | printf_error("Module close error: %s\n", | |
145 | g_module_error()); | |
146 | } | |
147 | } | |
148 | ||
149 | if (shared_lib_handle->path) { | |
150 | g_string_free(shared_lib_handle->path, TRUE); | |
151 | } | |
152 | ||
153 | g_free(shared_lib_handle); | |
154 | } | |
155 | ||
156 | static | |
157 | struct bt_plugin_shared_lib_handle *bt_plugin_shared_lib_handle_create( | |
158 | const char *path) | |
159 | { | |
160 | struct bt_plugin_shared_lib_handle *shared_lib_handle = NULL; | |
33b34c43 PP |
161 | |
162 | shared_lib_handle = g_new0(struct bt_plugin_shared_lib_handle, 1); | |
163 | if (!shared_lib_handle) { | |
164 | goto error; | |
165 | } | |
166 | ||
167 | bt_object_init(shared_lib_handle, bt_plugin_shared_lib_handle_destroy); | |
168 | ||
169 | if (!path) { | |
170 | goto end; | |
171 | } | |
172 | ||
173 | shared_lib_handle->path = g_string_new(path); | |
174 | if (!shared_lib_handle->path) { | |
175 | goto error; | |
176 | } | |
177 | ||
178 | shared_lib_handle->module = g_module_open(path, 0); | |
179 | if (!shared_lib_handle->module) { | |
180 | printf_verbose("Module open error: %s\n", g_module_error()); | |
181 | goto error; | |
182 | } | |
183 | ||
33b34c43 PP |
184 | goto end; |
185 | ||
186 | error: | |
187 | BT_PUT(shared_lib_handle); | |
188 | ||
189 | end: | |
190 | return shared_lib_handle; | |
191 | } | |
192 | ||
193 | static | |
194 | void bt_plugin_destroy(struct bt_object *obj) | |
195 | { | |
196 | struct bt_plugin *plugin; | |
197 | ||
198 | assert(obj); | |
199 | plugin = container_of(obj, struct bt_plugin, base); | |
200 | ||
201 | BT_PUT(plugin->shared_lib_handle); | |
202 | ||
203 | if (plugin->comp_classes) { | |
204 | g_ptr_array_free(plugin->comp_classes, TRUE); | |
205 | } | |
206 | ||
207 | g_free(plugin); | |
208 | } | |
209 | ||
210 | static | |
6ba0b073 PP |
211 | struct bt_plugin *bt_plugin_create_empty( |
212 | struct bt_plugin_shared_lib_handle *shared_lib_handle) | |
213 | { | |
214 | struct bt_plugin *plugin = NULL; | |
215 | ||
216 | plugin = g_new0(struct bt_plugin, 1); | |
217 | if (!plugin) { | |
218 | goto error; | |
219 | } | |
220 | ||
221 | bt_object_init(plugin, bt_plugin_destroy); | |
222 | plugin->shared_lib_handle = bt_get(shared_lib_handle); | |
223 | ||
224 | /* Create empty array of component classes */ | |
225 | plugin->comp_classes = | |
226 | g_ptr_array_new_with_free_func((GDestroyNotify) bt_put); | |
227 | if (!plugin->comp_classes) { | |
228 | goto error; | |
229 | } | |
230 | ||
231 | goto end; | |
232 | ||
233 | error: | |
234 | BT_PUT(plugin); | |
235 | ||
236 | end: | |
237 | return plugin; | |
238 | } | |
239 | ||
d3e4dcd8 PP |
240 | /* |
241 | * This function does the following: | |
242 | * | |
243 | * 1. Iterate on the plugin descriptor attributes section and set the | |
244 | * plugin's attributes depending on the attribute types. This | |
245 | * includes the name of the plugin, its description, and its | |
246 | * initialization function, for example. | |
247 | * | |
248 | * 2. Iterate on the component class descriptors section and create one | |
249 | * "full descriptor" (temporary structure) for each one that is found | |
250 | * and attached to our plugin descriptor. | |
251 | * | |
252 | * 3. Iterate on the component class descriptor attributes section and | |
253 | * set the corresponding full descriptor's attributes depending on | |
254 | * the attribute types. This includes the description of the | |
255 | * component class, as well as its initialization and destroy | |
256 | * methods. | |
257 | * | |
258 | * 4. Call the user's plugin initialization function, if any is | |
259 | * defined. | |
260 | * | |
261 | * 5. For each full component class descriptor, create a component class | |
262 | * object, set its optional attributes, and add it to the plugin | |
263 | * object. | |
264 | * | |
265 | * 6. Freeze the plugin object. | |
266 | */ | |
6ba0b073 PP |
267 | static |
268 | enum bt_plugin_status bt_plugin_init( | |
269 | struct bt_plugin *plugin, | |
270 | const struct __bt_plugin_descriptor *descriptor, | |
271 | struct __bt_plugin_descriptor_attribute const * const *attrs_begin, | |
272 | struct __bt_plugin_descriptor_attribute const * const *attrs_end, | |
273 | struct __bt_plugin_component_class_descriptor const * const *cc_descriptors_begin, | |
274 | struct __bt_plugin_component_class_descriptor const * const *cc_descriptors_end, | |
275 | struct __bt_plugin_component_class_descriptor_attribute const * const *cc_descr_attrs_begin, | |
276 | struct __bt_plugin_component_class_descriptor_attribute const * const *cc_descr_attrs_end) | |
33b34c43 | 277 | { |
6ba0b073 PP |
278 | /* |
279 | * This structure's members point to the plugin's memory | |
280 | * (do NOT free). | |
281 | */ | |
282 | struct comp_class_full_descriptor { | |
283 | const struct __bt_plugin_component_class_descriptor *descriptor; | |
284 | const char *description; | |
d3e4dcd8 PP |
285 | bt_component_class_init_method init_method; |
286 | bt_component_class_destroy_method destroy_method; | |
287 | bt_component_class_filter_add_iterator_method filter_add_iterator_method; | |
288 | bt_component_class_sink_add_iterator_method sink_add_iterator_method; | |
6ba0b073 PP |
289 | }; |
290 | ||
33b34c43 | 291 | enum bt_plugin_status status = BT_PLUGIN_STATUS_OK; |
6ba0b073 PP |
292 | struct __bt_plugin_descriptor_attribute const * const *cur_attr_ptr; |
293 | struct __bt_plugin_component_class_descriptor const * const *cur_cc_descr_ptr; | |
294 | struct __bt_plugin_component_class_descriptor_attribute const * const *cur_cc_descr_attr_ptr; | |
295 | GArray *comp_class_full_descriptors; | |
296 | size_t i; | |
d3e4dcd8 | 297 | int ret; |
6ba0b073 PP |
298 | |
299 | comp_class_full_descriptors = g_array_new(FALSE, TRUE, | |
300 | sizeof(struct comp_class_full_descriptor)); | |
301 | if (!comp_class_full_descriptors) { | |
302 | status = BT_PLUGIN_STATUS_ERROR; | |
303 | goto end; | |
304 | } | |
33b34c43 | 305 | |
6ba0b073 PP |
306 | /* Set mandatory attributes */ |
307 | plugin->descriptor = descriptor; | |
308 | plugin->name = descriptor->name; | |
33b34c43 | 309 | |
6ba0b073 PP |
310 | /* |
311 | * Find and set optional attributes attached to this plugin | |
312 | * descriptor. | |
313 | */ | |
314 | for (cur_attr_ptr = attrs_begin; cur_attr_ptr != attrs_end; cur_attr_ptr++) { | |
315 | const struct __bt_plugin_descriptor_attribute *cur_attr = | |
316 | *cur_attr_ptr; | |
317 | ||
318 | if (cur_attr->plugin_descriptor != descriptor) { | |
319 | continue; | |
320 | } | |
321 | ||
322 | switch (cur_attr->type) { | |
323 | case BT_PLUGIN_DESCRIPTOR_ATTRIBUTE_TYPE_INIT: | |
324 | plugin->init = cur_attr->value.init; | |
325 | break; | |
326 | case BT_PLUGIN_DESCRIPTOR_ATTRIBUTE_TYPE_EXIT: | |
327 | plugin->shared_lib_handle->exit = cur_attr->value.exit; | |
328 | break; | |
329 | case BT_PLUGIN_DESCRIPTOR_ATTRIBUTE_TYPE_AUTHOR: | |
330 | plugin->author = cur_attr->value.author; | |
331 | break; | |
332 | case BT_PLUGIN_DESCRIPTOR_ATTRIBUTE_TYPE_LICENSE: | |
333 | plugin->license = cur_attr->value.license; | |
334 | break; | |
335 | case BT_PLUGIN_DESCRIPTOR_ATTRIBUTE_TYPE_DESCRIPTION: | |
336 | plugin->description = cur_attr->value.description; | |
337 | break; | |
b6de043b PP |
338 | case BT_PLUGIN_DESCRIPTOR_ATTRIBUTE_TYPE_VERSION: |
339 | plugin->version = &cur_attr->value.version; | |
340 | break; | |
6ba0b073 PP |
341 | default: |
342 | printf_verbose("WARNING: Unknown attribute \"%s\" (type %d) for plugin %s\n", | |
343 | cur_attr->type_name, cur_attr->type, | |
344 | descriptor->name); | |
345 | break; | |
346 | } | |
347 | } | |
348 | ||
349 | /* | |
350 | * Find component class descriptors attached to this plugin | |
351 | * descriptor and initialize corresponding full component class | |
352 | * descriptors in the array. | |
353 | */ | |
354 | for (cur_cc_descr_ptr = cc_descriptors_begin; cur_cc_descr_ptr != cc_descriptors_end; cur_cc_descr_ptr++) { | |
355 | const struct __bt_plugin_component_class_descriptor *cur_cc_descr = | |
356 | *cur_cc_descr_ptr; | |
d3e4dcd8 | 357 | struct comp_class_full_descriptor full_descriptor = {0}; |
6ba0b073 PP |
358 | |
359 | if (cur_cc_descr->plugin_descriptor != descriptor) { | |
360 | continue; | |
361 | } | |
362 | ||
363 | full_descriptor.descriptor = cur_cc_descr; | |
6ba0b073 PP |
364 | g_array_append_val(comp_class_full_descriptors, |
365 | full_descriptor); | |
366 | } | |
367 | ||
368 | /* | |
369 | * Find component class descriptor attributes attached to this | |
370 | * plugin descriptor and update corresponding full component | |
371 | * class descriptors in the array. | |
372 | */ | |
373 | for (cur_cc_descr_attr_ptr = cc_descr_attrs_begin; cur_cc_descr_attr_ptr != cc_descr_attrs_end; cur_cc_descr_attr_ptr++) { | |
374 | const struct __bt_plugin_component_class_descriptor_attribute *cur_cc_descr_attr = | |
375 | *cur_cc_descr_attr_ptr; | |
376 | ||
377 | if (cur_cc_descr_attr->comp_class_descriptor->plugin_descriptor != | |
378 | descriptor) { | |
379 | continue; | |
380 | } | |
381 | ||
382 | /* Find the corresponding component class descriptor entry */ | |
383 | for (i = 0; i < comp_class_full_descriptors->len; i++) { | |
384 | struct comp_class_full_descriptor *cc_full_descr = | |
385 | &g_array_index(comp_class_full_descriptors, | |
386 | struct comp_class_full_descriptor, i); | |
387 | ||
388 | if (cur_cc_descr_attr->comp_class_descriptor == | |
389 | cc_full_descr->descriptor) { | |
390 | switch (cur_cc_descr_attr->type) { | |
391 | case BT_PLUGIN_COMPONENT_CLASS_DESCRIPTOR_ATTRIBUTE_TYPE_DESCRIPTION: | |
392 | cc_full_descr->description = | |
393 | cur_cc_descr_attr->value.description; | |
394 | break; | |
d3e4dcd8 PP |
395 | case BT_PLUGIN_COMPONENT_CLASS_DESCRIPTOR_ATTRIBUTE_TYPE_INIT_METHOD: |
396 | cc_full_descr->init_method = | |
397 | cur_cc_descr_attr->value.init_method; | |
398 | break; | |
399 | case BT_PLUGIN_COMPONENT_CLASS_DESCRIPTOR_ATTRIBUTE_TYPE_DESTROY_METHOD: | |
400 | cc_full_descr->destroy_method = | |
401 | cur_cc_descr_attr->value.destroy_method; | |
402 | break; | |
403 | case BT_PLUGIN_COMPONENT_CLASS_DESCRIPTOR_ATTRIBUTE_TYPE_FILTER_ADD_ITERATOR_METHOD: | |
404 | cc_full_descr->filter_add_iterator_method = | |
405 | cur_cc_descr_attr->value.filter_add_iterator_method; | |
406 | break; | |
407 | case BT_PLUGIN_COMPONENT_CLASS_DESCRIPTOR_ATTRIBUTE_TYPE_SINK_ADD_ITERATOR_METHOD: | |
408 | cc_full_descr->sink_add_iterator_method = | |
409 | cur_cc_descr_attr->value.sink_add_iterator_method; | |
410 | break; | |
6ba0b073 PP |
411 | default: |
412 | printf_verbose("WARNING: Unknown attribute \"%s\" (type %d) for component class %s (type %d) in plugin %s\n", | |
413 | cur_cc_descr_attr->type_name, | |
414 | cur_cc_descr_attr->type, | |
415 | cur_cc_descr_attr->comp_class_descriptor->name, | |
416 | cur_cc_descr_attr->comp_class_descriptor->type, | |
417 | descriptor->name); | |
418 | break; | |
419 | } | |
420 | } | |
421 | } | |
422 | } | |
423 | ||
424 | /* Initialize plugin */ | |
425 | if (plugin->init) { | |
426 | status = plugin->init(plugin); | |
33b34c43 PP |
427 | if (status < 0) { |
428 | printf_verbose("Plugin `%s` initialization error: %d\n", | |
6ba0b073 | 429 | plugin->name, status); |
33b34c43 PP |
430 | goto end; |
431 | } | |
432 | } | |
433 | ||
434 | plugin->shared_lib_handle->init_called = true; | |
435 | ||
d3e4dcd8 | 436 | /* Add described component classes to plugin */ |
6ba0b073 PP |
437 | for (i = 0; i < comp_class_full_descriptors->len; i++) { |
438 | struct comp_class_full_descriptor *cc_full_descr = | |
439 | &g_array_index(comp_class_full_descriptors, | |
440 | struct comp_class_full_descriptor, i); | |
441 | struct bt_component_class *comp_class; | |
442 | ||
d3e4dcd8 PP |
443 | switch (cc_full_descr->descriptor->type) { |
444 | case BT_COMPONENT_CLASS_TYPE_SOURCE: | |
445 | comp_class = bt_component_class_source_create( | |
446 | cc_full_descr->descriptor->name, | |
447 | cc_full_descr->descriptor->methods.source.init_iterator); | |
448 | break; | |
449 | case BT_COMPONENT_CLASS_TYPE_FILTER: | |
450 | comp_class = bt_component_class_filter_create( | |
451 | cc_full_descr->descriptor->name, | |
452 | cc_full_descr->descriptor->methods.filter.init_iterator); | |
453 | break; | |
454 | case BT_COMPONENT_CLASS_TYPE_SINK: | |
455 | comp_class = bt_component_class_sink_create( | |
456 | cc_full_descr->descriptor->name, | |
457 | cc_full_descr->descriptor->methods.sink.consume); | |
458 | break; | |
459 | default: | |
460 | printf_verbose("WARNING: Unknown component class type %d for component class %s in plugin %s\n", | |
461 | cc_full_descr->descriptor->type, | |
462 | cc_full_descr->descriptor->name, | |
463 | descriptor->name); | |
464 | continue; | |
465 | } | |
466 | ||
6ba0b073 PP |
467 | if (!comp_class) { |
468 | status = BT_PLUGIN_STATUS_ERROR; | |
469 | goto end; | |
470 | } | |
471 | ||
d3e4dcd8 PP |
472 | if (cc_full_descr->description) { |
473 | ret = bt_component_class_set_description(comp_class, | |
474 | cc_full_descr->description); | |
475 | if (ret) { | |
476 | status = BT_PLUGIN_STATUS_ERROR; | |
477 | BT_PUT(comp_class); | |
478 | goto end; | |
479 | } | |
480 | } | |
481 | ||
482 | if (cc_full_descr->init_method) { | |
483 | ret = bt_component_class_set_init_method(comp_class, | |
484 | cc_full_descr->init_method); | |
485 | if (ret) { | |
486 | status = BT_PLUGIN_STATUS_ERROR; | |
487 | BT_PUT(comp_class); | |
488 | goto end; | |
489 | } | |
490 | } | |
491 | ||
492 | if (cc_full_descr->destroy_method) { | |
493 | ret = bt_component_class_set_destroy_method(comp_class, | |
494 | cc_full_descr->destroy_method); | |
495 | if (ret) { | |
496 | status = BT_PLUGIN_STATUS_ERROR; | |
497 | BT_PUT(comp_class); | |
498 | goto end; | |
499 | } | |
500 | } | |
501 | ||
502 | if (cc_full_descr->descriptor->type == | |
503 | BT_COMPONENT_CLASS_TYPE_FILTER && | |
504 | cc_full_descr->filter_add_iterator_method) { | |
505 | ret = bt_component_class_filter_set_add_iterator_method(comp_class, | |
506 | cc_full_descr->filter_add_iterator_method); | |
507 | if (ret) { | |
508 | status = BT_PLUGIN_STATUS_ERROR; | |
509 | BT_PUT(comp_class); | |
510 | goto end; | |
511 | } | |
512 | } | |
513 | ||
514 | if (cc_full_descr->descriptor->type == | |
515 | BT_COMPONENT_CLASS_TYPE_SINK && | |
516 | cc_full_descr->sink_add_iterator_method) { | |
517 | ret = bt_component_class_sink_set_add_iterator_method(comp_class, | |
518 | cc_full_descr->sink_add_iterator_method); | |
519 | if (ret) { | |
520 | status = BT_PLUGIN_STATUS_ERROR; | |
521 | BT_PUT(comp_class); | |
522 | goto end; | |
523 | } | |
524 | } | |
525 | ||
526 | /* Add component class to the plugin object */ | |
6ba0b073 PP |
527 | status = bt_plugin_add_component_class(plugin, |
528 | comp_class); | |
529 | BT_PUT(comp_class); | |
530 | if (status < 0) { | |
531 | printf_verbose("Cannot add component class %s (type %d) to plugin `%s`: status = %d\n", | |
532 | cc_full_descr->descriptor->name, | |
533 | cc_full_descr->descriptor->type, | |
534 | plugin->name, status); | |
535 | goto end; | |
536 | } | |
537 | } | |
538 | ||
33b34c43 | 539 | /* |
6ba0b073 PP |
540 | * All the plugin's component classes should be added at this |
541 | * point. We freeze the plugin so that it's not possible to add | |
542 | * component classes to this plugin object after this stage | |
543 | * (plugin object becomes immutable). | |
33b34c43 PP |
544 | */ |
545 | plugin->frozen = true; | |
546 | ||
547 | end: | |
6ba0b073 | 548 | g_array_free(comp_class_full_descriptors, TRUE); |
33b34c43 PP |
549 | return status; |
550 | } | |
551 | ||
6ba0b073 PP |
552 | static |
553 | struct bt_plugin **bt_plugin_create_all_from_sections( | |
554 | struct bt_plugin_shared_lib_handle *shared_lib_handle, | |
555 | struct __bt_plugin_descriptor const * const *descriptors_begin, | |
556 | struct __bt_plugin_descriptor const * const *descriptors_end, | |
557 | struct __bt_plugin_descriptor_attribute const * const *attrs_begin, | |
558 | struct __bt_plugin_descriptor_attribute const * const *attrs_end, | |
559 | struct __bt_plugin_component_class_descriptor const * const *cc_descriptors_begin, | |
560 | struct __bt_plugin_component_class_descriptor const * const *cc_descriptors_end, | |
561 | struct __bt_plugin_component_class_descriptor_attribute const * const *cc_descr_attrs_begin, | |
562 | struct __bt_plugin_component_class_descriptor_attribute const * const *cc_descr_attrs_end) | |
563 | { | |
564 | size_t descriptor_count; | |
565 | size_t attrs_count; | |
566 | size_t cc_descriptors_count; | |
567 | size_t cc_descr_attrs_count; | |
568 | size_t i; | |
569 | struct bt_plugin **plugins = NULL; | |
570 | ||
571 | descriptor_count = descriptors_end - descriptors_begin; | |
572 | attrs_count = attrs_end - attrs_begin; | |
573 | cc_descriptors_count = cc_descriptors_end - cc_descriptors_begin; | |
574 | cc_descr_attrs_count = cc_descr_attrs_end - cc_descr_attrs_begin; | |
575 | printf_verbose("Section: Plugin descriptors: [%p - %p], (%zu elements)\n", | |
576 | descriptors_begin, descriptors_end, descriptor_count); | |
577 | printf_verbose("Section: Plugin descriptor attributes: [%p - %p], (%zu elements)\n", | |
578 | attrs_begin, attrs_end, attrs_count); | |
579 | printf_verbose("Section: Plugin component class descriptors: [%p - %p], (%zu elements)\n", | |
580 | cc_descriptors_begin, cc_descriptors_end, cc_descriptors_count); | |
581 | printf_verbose("Section: Plugin component class descriptor attributes: [%p - %p], (%zu elements)\n", | |
d3e4dcd8 | 582 | cc_descr_attrs_begin, cc_descr_attrs_end, cc_descr_attrs_count); |
6ba0b073 PP |
583 | plugins = calloc(descriptor_count + 1, sizeof(*plugins)); |
584 | if (!plugins) { | |
585 | goto error; | |
586 | } | |
587 | ||
588 | for (i = 0; i < descriptor_count; i++) { | |
589 | enum bt_plugin_status status; | |
590 | const struct __bt_plugin_descriptor *descriptor = | |
591 | descriptors_begin[i]; | |
592 | struct bt_plugin *plugin; | |
593 | ||
594 | printf_verbose("Loading plugin %s (%d.%d)\n", descriptor->name, | |
595 | descriptor->major, descriptor->minor); | |
596 | ||
597 | if (descriptor->major > __BT_PLUGIN_VERSION_MAJOR) { | |
598 | printf_error("Unknown plugin's major version: %d\n", | |
599 | descriptor->major); | |
600 | goto error; | |
601 | } | |
602 | ||
603 | plugin = bt_plugin_create_empty(shared_lib_handle); | |
604 | if (!plugin) { | |
605 | printf_error("Cannot allocate plugin object for plugin %s\n", | |
606 | descriptor->name); | |
607 | goto error; | |
608 | } | |
609 | ||
610 | status = bt_plugin_init(plugin, descriptor, attrs_begin, | |
611 | attrs_end, cc_descriptors_begin, cc_descriptors_end, | |
612 | cc_descr_attrs_begin, cc_descr_attrs_end); | |
613 | if (status < 0) { | |
614 | printf_error("Cannot initialize plugin object %s\n", | |
615 | descriptor->name); | |
616 | BT_PUT(plugin); | |
617 | goto error; | |
618 | } | |
619 | ||
620 | /* Transfer ownership to the array */ | |
621 | plugins[i] = plugin; | |
622 | } | |
623 | ||
624 | goto end; | |
625 | ||
626 | error: | |
627 | g_free(plugins); | |
628 | plugins = NULL; | |
629 | ||
630 | end: | |
631 | return plugins; | |
632 | } | |
633 | ||
634 | struct bt_plugin **bt_plugin_create_all_from_static(void) | |
635 | { | |
636 | struct bt_plugin **plugins = NULL; | |
637 | struct bt_plugin_shared_lib_handle *shared_lib_handle = | |
638 | bt_plugin_shared_lib_handle_create(NULL); | |
639 | ||
640 | if (!shared_lib_handle) { | |
641 | goto end; | |
642 | } | |
643 | ||
644 | plugins = bt_plugin_create_all_from_sections(shared_lib_handle, | |
645 | SECTION_BEGIN(__bt_plugin_descriptors), | |
646 | SECTION_END(__bt_plugin_descriptors), | |
647 | SECTION_BEGIN(__bt_plugin_descriptor_attributes), | |
648 | SECTION_END(__bt_plugin_descriptor_attributes), | |
649 | SECTION_BEGIN(__bt_plugin_component_class_descriptors), | |
650 | SECTION_END(__bt_plugin_component_class_descriptors), | |
651 | SECTION_BEGIN(__bt_plugin_component_class_descriptor_attributes), | |
652 | SECTION_END(__bt_plugin_component_class_descriptor_attributes)); | |
653 | ||
654 | end: | |
655 | BT_PUT(shared_lib_handle); | |
656 | ||
657 | return plugins; | |
658 | } | |
659 | ||
660 | struct bt_plugin **bt_plugin_create_all_from_file(const char *path) | |
33b34c43 PP |
661 | { |
662 | size_t path_len; | |
6ba0b073 PP |
663 | struct bt_plugin **plugins = NULL; |
664 | struct __bt_plugin_descriptor const * const *descriptors_begin = NULL; | |
665 | struct __bt_plugin_descriptor const * const *descriptors_end = NULL; | |
666 | struct __bt_plugin_descriptor_attribute const * const *attrs_begin = NULL; | |
667 | struct __bt_plugin_descriptor_attribute const * const *attrs_end = NULL; | |
668 | struct __bt_plugin_component_class_descriptor const * const *cc_descriptors_begin = NULL; | |
669 | struct __bt_plugin_component_class_descriptor const * const *cc_descriptors_end = NULL; | |
670 | struct __bt_plugin_component_class_descriptor_attribute const * const *cc_descr_attrs_begin = NULL; | |
671 | struct __bt_plugin_component_class_descriptor_attribute const * const *cc_descr_attrs_end = NULL; | |
33b34c43 | 672 | bool is_libtool_wrapper = false, is_shared_object = false; |
6ba0b073 | 673 | struct bt_plugin_shared_lib_handle *shared_lib_handle = NULL; |
33b34c43 PP |
674 | |
675 | if (!path) { | |
6ba0b073 | 676 | goto end; |
33b34c43 PP |
677 | } |
678 | ||
679 | path_len = strlen(path); | |
680 | if (path_len <= PLUGIN_SUFFIX_LEN) { | |
6ba0b073 | 681 | goto end; |
33b34c43 PP |
682 | } |
683 | ||
684 | path_len++; | |
685 | /* | |
686 | * Check if the file ends with a known plugin file type suffix (i.e. .so | |
687 | * or .la on Linux). | |
688 | */ | |
689 | is_libtool_wrapper = !strncmp(LIBTOOL_PLUGIN_SUFFIX, | |
690 | path + path_len - LIBTOOL_PLUGIN_SUFFIX_LEN, | |
691 | LIBTOOL_PLUGIN_SUFFIX_LEN); | |
692 | is_shared_object = !strncmp(NATIVE_PLUGIN_SUFFIX, | |
693 | path + path_len - NATIVE_PLUGIN_SUFFIX_LEN, | |
694 | NATIVE_PLUGIN_SUFFIX_LEN); | |
695 | if (!is_shared_object && !is_libtool_wrapper) { | |
696 | /* Name indicates that this is not a plugin file. */ | |
6ba0b073 | 697 | goto end; |
33b34c43 PP |
698 | } |
699 | ||
6ba0b073 PP |
700 | shared_lib_handle = bt_plugin_shared_lib_handle_create(path); |
701 | if (!shared_lib_handle) { | |
702 | goto end; | |
33b34c43 PP |
703 | } |
704 | ||
6ba0b073 PP |
705 | if (!g_module_symbol(shared_lib_handle->module, "__start___bt_plugin_descriptors", |
706 | (gpointer *) &descriptors_begin)) { | |
707 | printf_verbose("Unable to resolve plugin symbol %s from %s\n", | |
708 | "__start___bt_plugin_descriptors", | |
709 | g_module_name(shared_lib_handle->module)); | |
710 | goto end; | |
711 | } | |
33b34c43 | 712 | |
6ba0b073 PP |
713 | if (!g_module_symbol(shared_lib_handle->module, "__stop___bt_plugin_descriptors", |
714 | (gpointer *) &descriptors_end)) { | |
715 | printf_verbose("Unable to resolve plugin symbol %s from %s\n", | |
716 | "__stop___bt_plugin_descriptors", | |
717 | g_module_name(shared_lib_handle->module)); | |
718 | goto end; | |
33b34c43 PP |
719 | } |
720 | ||
6ba0b073 PP |
721 | if (!g_module_symbol(shared_lib_handle->module, "__start___bt_plugin_descriptor_attributes", |
722 | (gpointer *) &attrs_begin)) { | |
723 | printf_verbose("Unable to resolve plugin symbol %s from %s\n", | |
724 | "__start___bt_plugin_descriptor_attributes", | |
725 | g_module_name(shared_lib_handle->module)); | |
33b34c43 PP |
726 | } |
727 | ||
6ba0b073 PP |
728 | if (!g_module_symbol(shared_lib_handle->module, "__stop___bt_plugin_descriptor_attributes", |
729 | (gpointer *) &attrs_end)) { | |
730 | printf_verbose("Unable to resolve plugin symbol %s from %s\n", | |
731 | "__stop___bt_plugin_descriptor_attributes", | |
732 | g_module_name(shared_lib_handle->module)); | |
33b34c43 PP |
733 | } |
734 | ||
6ba0b073 PP |
735 | if ((!!attrs_begin - !!attrs_end) != 0) { |
736 | printf_verbose("Found __start___bt_plugin_descriptor_attributes or __stop___bt_plugin_descriptor_attributes symbol, but not both in %s\n", | |
737 | g_module_name(shared_lib_handle->module)); | |
738 | goto end; | |
739 | } | |
33b34c43 | 740 | |
6ba0b073 PP |
741 | if (!g_module_symbol(shared_lib_handle->module, "__start___bt_plugin_component_class_descriptors", |
742 | (gpointer *) &cc_descriptors_begin)) { | |
743 | printf_verbose("Unable to resolve plugin symbol %s from %s\n", | |
744 | "__start___bt_plugin_component_class_descriptors", | |
745 | g_module_name(shared_lib_handle->module)); | |
746 | } | |
747 | ||
748 | if (!g_module_symbol(shared_lib_handle->module, "__stop___bt_plugin_component_class_descriptors", | |
749 | (gpointer *) &cc_descriptors_end)) { | |
750 | printf_verbose("Unable to resolve plugin symbol %s from %s\n", | |
751 | "__stop___bt_plugin_component_class_descriptors", | |
752 | g_module_name(shared_lib_handle->module)); | |
753 | } | |
754 | ||
755 | if ((!!cc_descriptors_begin - !!cc_descriptors_end) != 0) { | |
756 | printf_verbose("Found __start___bt_plugin_component_class_descriptors or __stop___bt_plugin_component_class_descriptors symbol, but not both in %s\n", | |
757 | g_module_name(shared_lib_handle->module)); | |
758 | goto end; | |
759 | } | |
760 | ||
761 | if (!g_module_symbol(shared_lib_handle->module, "__start___bt_plugin_component_class_descriptor_attributes", | |
762 | (gpointer *) &cc_descr_attrs_begin)) { | |
763 | printf_verbose("Unable to resolve plugin symbol %s from %s\n", | |
764 | "__start___bt_plugin_component_class_descriptor_attributes", | |
765 | g_module_name(shared_lib_handle->module)); | |
766 | } | |
767 | ||
768 | if (!g_module_symbol(shared_lib_handle->module, "__stop___bt_plugin_component_class_descriptor_attributes", | |
769 | (gpointer *) &cc_descr_attrs_end)) { | |
770 | printf_verbose("Unable to resolve plugin symbol %s from %s\n", | |
771 | "__stop___bt_plugin_component_class_descriptor_attributes", | |
772 | g_module_name(shared_lib_handle->module)); | |
773 | } | |
774 | ||
775 | if ((!!cc_descr_attrs_begin - !!cc_descr_attrs_end) != 0) { | |
776 | printf_verbose("Found __start___bt_plugin_component_class_descriptor_attributes or __stop___bt_plugin_component_class_descriptor_attributes symbol, but not both in %s\n", | |
777 | g_module_name(shared_lib_handle->module)); | |
778 | goto end; | |
779 | } | |
780 | ||
781 | /* Initialize plugin */ | |
782 | plugins = bt_plugin_create_all_from_sections(shared_lib_handle, | |
783 | descriptors_begin, descriptors_end, attrs_begin, attrs_end, | |
784 | cc_descriptors_begin, cc_descriptors_end, | |
785 | cc_descr_attrs_begin, cc_descr_attrs_end); | |
33b34c43 PP |
786 | |
787 | end: | |
6ba0b073 PP |
788 | BT_PUT(shared_lib_handle); |
789 | return plugins; | |
33b34c43 PP |
790 | } |
791 | ||
792 | /* Allocate dirent as recommended by READDIR(3), NOTES on readdir_r */ | |
793 | static | |
794 | struct dirent *alloc_dirent(const char *path) | |
795 | { | |
796 | size_t len; | |
797 | long name_max; | |
798 | struct dirent *entry; | |
799 | ||
800 | name_max = pathconf(path, _PC_NAME_MAX); | |
801 | if (name_max == -1) { | |
802 | name_max = PATH_MAX; | |
803 | } | |
804 | len = offsetof(struct dirent, d_name) + name_max + 1; | |
805 | entry = zmalloc(len); | |
806 | return entry; | |
807 | } | |
808 | ||
809 | static | |
810 | enum bt_plugin_status bt_plugin_create_append_all_from_dir( | |
811 | GPtrArray *plugins, const char *path, bool recurse) | |
812 | { | |
813 | DIR *directory = NULL; | |
814 | struct dirent *entry = NULL, *result = NULL; | |
815 | char *file_path = NULL; | |
6ba0b073 | 816 | size_t path_len; |
33b34c43 PP |
817 | enum bt_plugin_status ret = BT_PLUGIN_STATUS_OK; |
818 | ||
6ba0b073 PP |
819 | if (!path) { |
820 | ret = BT_PLUGIN_STATUS_ERROR; | |
821 | goto end; | |
822 | } | |
823 | ||
824 | path_len = strlen(path); | |
825 | ||
33b34c43 PP |
826 | if (path_len >= PATH_MAX) { |
827 | ret = BT_PLUGIN_STATUS_ERROR; | |
828 | goto end; | |
829 | } | |
830 | ||
831 | entry = alloc_dirent(path); | |
832 | if (!entry) { | |
833 | ret = BT_PLUGIN_STATUS_ERROR; | |
834 | goto end; | |
835 | } | |
836 | ||
837 | file_path = zmalloc(PATH_MAX); | |
838 | if (!file_path) { | |
839 | ret = BT_PLUGIN_STATUS_NOMEM; | |
840 | goto end; | |
841 | } | |
842 | ||
843 | strncpy(file_path, path, path_len); | |
844 | /* Append a trailing '/' to the path */ | |
845 | if (file_path[path_len - 1] != '/') { | |
846 | file_path[path_len++] = '/'; | |
847 | } | |
848 | ||
849 | directory = opendir(file_path); | |
850 | if (!directory) { | |
851 | perror("Failed to open plug-in directory"); | |
852 | ret = BT_PLUGIN_STATUS_ERROR; | |
853 | goto end; | |
854 | } | |
855 | ||
856 | /* Recursively walk directory */ | |
857 | while (!readdir_r(directory, entry, &result) && result) { | |
858 | struct stat st; | |
859 | int stat_ret; | |
860 | size_t file_name_len; | |
861 | ||
862 | if (result->d_name[0] == '.') { | |
863 | /* Skip hidden files, . and .. */ | |
864 | continue; | |
865 | } | |
866 | ||
867 | file_name_len = strlen(result->d_name); | |
868 | ||
869 | if (path_len + file_name_len >= PATH_MAX) { | |
870 | continue; | |
871 | } | |
872 | ||
873 | strncpy(file_path + path_len, result->d_name, file_name_len); | |
874 | file_path[path_len + file_name_len] = '\0'; | |
875 | ||
876 | stat_ret = stat(file_path, &st); | |
877 | if (stat_ret < 0) { | |
878 | /* Continue to next file / directory. */ | |
879 | printf_perror("Failed to stat() plugin file\n"); | |
880 | continue; | |
881 | } | |
882 | ||
883 | if (S_ISDIR(st.st_mode) && recurse) { | |
884 | ret = bt_plugin_create_append_all_from_dir(plugins, | |
885 | file_path, true); | |
886 | if (ret < 0) { | |
887 | goto end; | |
888 | } | |
889 | } else if (S_ISREG(st.st_mode)) { | |
6ba0b073 PP |
890 | struct bt_plugin **plugins_from_file = |
891 | bt_plugin_create_all_from_file(file_path); | |
33b34c43 | 892 | |
6ba0b073 PP |
893 | if (plugins_from_file) { |
894 | struct bt_plugin **plugin; | |
895 | ||
896 | for (plugin = plugins_from_file; *plugin; plugin++) { | |
897 | /* Transfer ownership to array */ | |
898 | g_ptr_array_add(plugins, *plugin); | |
899 | } | |
900 | ||
901 | free(plugins_from_file); | |
33b34c43 PP |
902 | } |
903 | } | |
904 | } | |
905 | end: | |
906 | if (directory) { | |
907 | if (closedir(directory)) { | |
908 | /* | |
909 | * We don't want to override the error since there is | |
910 | * nothing could do. | |
911 | */ | |
912 | perror("Failed to close plug-in directory"); | |
913 | } | |
914 | } | |
915 | free(entry); | |
916 | free(file_path); | |
917 | return ret; | |
918 | } | |
919 | ||
920 | struct bt_plugin **bt_plugin_create_all_from_dir(const char *path, | |
921 | bool recurse) | |
922 | { | |
6ba0b073 | 923 | GPtrArray *plugins_array = g_ptr_array_new(); |
33b34c43 PP |
924 | struct bt_plugin **plugins = NULL; |
925 | enum bt_plugin_status status; | |
926 | ||
33b34c43 PP |
927 | /* Append found plugins to array */ |
928 | status = bt_plugin_create_append_all_from_dir(plugins_array, path, | |
929 | recurse); | |
930 | if (status < 0) { | |
931 | goto error; | |
932 | } | |
933 | ||
934 | /* Add sentinel to array */ | |
935 | g_ptr_array_add(plugins_array, NULL); | |
936 | plugins = (struct bt_plugin **) plugins_array->pdata; | |
937 | goto end; | |
938 | ||
939 | error: | |
940 | if (plugins_array) { | |
941 | g_ptr_array_free(plugins_array, TRUE); | |
942 | plugins_array = NULL; | |
943 | } | |
944 | ||
945 | end: | |
946 | if (plugins_array) { | |
947 | g_ptr_array_free(plugins_array, FALSE); | |
948 | } | |
949 | ||
950 | return plugins; | |
951 | } | |
952 | ||
33b34c43 PP |
953 | const char *bt_plugin_get_name(struct bt_plugin *plugin) |
954 | { | |
6ba0b073 | 955 | return plugin ? plugin->name : NULL; |
33b34c43 PP |
956 | } |
957 | ||
958 | const char *bt_plugin_get_author(struct bt_plugin *plugin) | |
959 | { | |
6ba0b073 | 960 | return plugin ? plugin->author : NULL; |
33b34c43 PP |
961 | } |
962 | ||
963 | const char *bt_plugin_get_license(struct bt_plugin *plugin) | |
964 | { | |
6ba0b073 | 965 | return plugin ? plugin->license : NULL; |
33b34c43 PP |
966 | } |
967 | ||
968 | const char *bt_plugin_get_path(struct bt_plugin *plugin) | |
969 | { | |
970 | return (plugin && plugin->shared_lib_handle->path) ? | |
971 | plugin->shared_lib_handle->path->str : NULL; | |
972 | } | |
973 | ||
974 | const char *bt_plugin_get_description(struct bt_plugin *plugin) | |
975 | { | |
6ba0b073 | 976 | return plugin ? plugin->description : NULL; |
33b34c43 PP |
977 | } |
978 | ||
b6de043b PP |
979 | enum bt_plugin_status bt_plugin_get_version(struct bt_plugin *plugin, |
980 | unsigned int *major, unsigned int *minor, unsigned int *patch, | |
981 | const char **extra) | |
982 | { | |
983 | enum bt_plugin_status status = BT_PLUGIN_STATUS_OK; | |
984 | ||
985 | if (!plugin || !plugin->version) { | |
986 | status = BT_PLUGIN_STATUS_ERROR; | |
987 | goto end; | |
988 | } | |
989 | ||
990 | if (major) { | |
991 | *major = (unsigned int) plugin->version->major; | |
992 | } | |
993 | ||
994 | if (minor) { | |
995 | *minor = (unsigned int) plugin->version->minor; | |
996 | } | |
997 | ||
998 | if (patch) { | |
999 | *patch = (unsigned int) plugin->version->patch; | |
1000 | } | |
1001 | ||
1002 | if (extra) { | |
1003 | *extra = plugin->version->extra; | |
1004 | } | |
1005 | ||
1006 | end: | |
1007 | return status; | |
1008 | } | |
1009 | ||
33b34c43 PP |
1010 | int bt_plugin_get_component_class_count(struct bt_plugin *plugin) |
1011 | { | |
1012 | return plugin ? plugin->comp_classes->len : -1; | |
1013 | } | |
1014 | ||
1015 | struct bt_component_class *bt_plugin_get_component_class( | |
1016 | struct bt_plugin *plugin, size_t index) | |
1017 | { | |
1018 | struct bt_component_class *comp_class = NULL; | |
1019 | ||
1020 | if (!plugin || index >= plugin->comp_classes->len) { | |
1021 | goto error; | |
1022 | } | |
1023 | ||
1024 | comp_class = g_ptr_array_index(plugin->comp_classes, index); | |
1025 | bt_get(comp_class); | |
1026 | goto end; | |
1027 | ||
1028 | error: | |
1029 | BT_PUT(comp_class); | |
1030 | ||
1031 | end: | |
1032 | return comp_class; | |
1033 | } | |
1034 | ||
1035 | struct bt_component_class *bt_plugin_get_component_class_by_name_and_type( | |
1036 | struct bt_plugin *plugin, const char *name, | |
d3e4dcd8 | 1037 | enum bt_component_class_type type) |
33b34c43 PP |
1038 | { |
1039 | struct bt_component_class *comp_class = NULL; | |
1040 | size_t i; | |
1041 | ||
1042 | if (!plugin || !name) { | |
1043 | goto error; | |
1044 | } | |
1045 | ||
1046 | for (i = 0; i < plugin->comp_classes->len; i++) { | |
1047 | struct bt_component_class *comp_class_candidate = | |
1048 | g_ptr_array_index(plugin->comp_classes, i); | |
1049 | const char *comp_class_cand_name = | |
1050 | bt_component_class_get_name(comp_class_candidate); | |
d3e4dcd8 | 1051 | enum bt_component_class_type comp_class_cand_type = |
33b34c43 PP |
1052 | bt_component_class_get_type(comp_class_candidate); |
1053 | ||
1054 | assert(comp_class_cand_name); | |
1055 | assert(comp_class_cand_type >= 0); | |
1056 | ||
1057 | if (strcmp(name, comp_class_cand_name) == 0 && | |
1058 | comp_class_cand_type == type) { | |
1059 | comp_class = bt_get(comp_class_candidate); | |
1060 | break; | |
1061 | } | |
1062 | } | |
1063 | ||
1064 | goto end; | |
1065 | ||
1066 | error: | |
1067 | BT_PUT(comp_class); | |
1068 | ||
1069 | end: | |
1070 | return comp_class; | |
1071 | } | |
1072 | ||
1073 | static | |
1074 | void plugin_comp_class_destroy_listener(struct bt_component_class *comp_class, | |
1075 | void *data) | |
1076 | { | |
1077 | gboolean exists = g_hash_table_remove(comp_classes_to_shlib_handles, | |
1078 | comp_class); | |
1079 | assert(exists); | |
1080 | } | |
1081 | ||
1082 | enum bt_plugin_status bt_plugin_add_component_class( | |
1083 | struct bt_plugin *plugin, struct bt_component_class *comp_class) | |
1084 | { | |
1085 | enum bt_plugin_status status = BT_PLUGIN_STATUS_OK; | |
1086 | struct bt_component_class *comp_class_dup = NULL; | |
1087 | int ret; | |
1088 | int comp_class_index = -1; | |
1089 | ||
1090 | if (!plugin || !comp_class || plugin->frozen) { | |
1091 | goto error; | |
1092 | } | |
1093 | ||
1094 | /* Check for duplicate */ | |
1095 | comp_class_dup = bt_plugin_get_component_class_by_name_and_type(plugin, | |
1096 | bt_component_class_get_name(comp_class), | |
1097 | bt_component_class_get_type(comp_class)); | |
1098 | if (comp_class_dup) { | |
1099 | printf_verbose("Plugin `%s`: adding component class with existing name `%s` and type %d\n", | |
6ba0b073 | 1100 | plugin->name, |
33b34c43 PP |
1101 | bt_component_class_get_name(comp_class), |
1102 | bt_component_class_get_type(comp_class)); | |
1103 | goto error; | |
1104 | } | |
1105 | ||
1106 | /* Add new component class */ | |
1107 | comp_class_index = plugin->comp_classes->len; | |
1108 | g_ptr_array_add(plugin->comp_classes, bt_get(comp_class)); | |
1109 | ||
1110 | /* Map component class pointer to shared lib handle in global HT */ | |
1111 | g_hash_table_insert(comp_classes_to_shlib_handles, comp_class, | |
1112 | bt_get(plugin->shared_lib_handle)); | |
1113 | ||
1114 | /* Add our custom destroy listener */ | |
1115 | ret = bt_component_class_add_destroy_listener(comp_class, | |
1116 | plugin_comp_class_destroy_listener, NULL); | |
1117 | if (ret) { | |
1118 | goto error; | |
1119 | } | |
1120 | ||
1121 | goto end; | |
1122 | ||
1123 | error: | |
1124 | /* Remove entry from global hash table (if exists) */ | |
1125 | g_hash_table_remove(comp_classes_to_shlib_handles, | |
1126 | comp_class); | |
1127 | ||
1128 | /* Remove entry from plugin's component classes (if added) */ | |
1129 | if (comp_class_index >= 0) { | |
1130 | g_ptr_array_remove_index(plugin->comp_classes, | |
1131 | comp_class_index); | |
1132 | } | |
1133 | ||
1134 | status = BT_PLUGIN_STATUS_ERROR; | |
1135 | ||
1136 | end: | |
1137 | bt_put(comp_class_dup); | |
1138 | return status; | |
1139 | } |