Commit | Line | Data |
---|---|---|
a58c490f | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
a58c490f | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: LGPL-2.1-only |
a58c490f | 5 | * |
a58c490f JG |
6 | */ |
7 | ||
c9e313bc SM |
8 | #include <common/credentials.hpp> |
9 | #include <common/dynamic-array.hpp> | |
10 | #include <common/error.hpp> | |
11 | #include <common/mi-lttng.hpp> | |
12 | #include <common/optional.hpp> | |
13 | #include <common/payload-view.hpp> | |
14 | #include <common/payload.hpp> | |
242388e4 | 15 | #include <inttypes.h> |
c9e313bc | 16 | #include <lttng/action/action-internal.hpp> |
9c374932 | 17 | #include <lttng/condition/buffer-usage.h> |
c9e313bc SM |
18 | #include <lttng/condition/condition-internal.hpp> |
19 | #include <lttng/condition/event-rule-matches-internal.hpp> | |
670a26e4 | 20 | #include <lttng/condition/event-rule-matches.h> |
9c374932 | 21 | #include <lttng/domain.h> |
c9e313bc SM |
22 | #include <lttng/error-query-internal.hpp> |
23 | #include <lttng/event-expr-internal.hpp> | |
24 | #include <lttng/event-rule/event-rule-internal.hpp> | |
25 | #include <lttng/trigger/trigger-internal.hpp> | |
9c374932 | 26 | #include <pthread.h> |
a58c490f | 27 | |
b61776fb | 28 | bool lttng_trigger_validate(const struct lttng_trigger *trigger) |
a58c490f JG |
29 | { |
30 | bool valid; | |
31 | ||
32 | if (!trigger) { | |
33 | valid = false; | |
34 | goto end; | |
35 | } | |
36 | ||
64eafdf6 JR |
37 | if (!trigger->creds.uid.is_set) { |
38 | valid = false; | |
39 | goto end; | |
40 | } | |
41 | ||
a58c490f JG |
42 | valid = lttng_condition_validate(trigger->condition) && |
43 | lttng_action_validate(trigger->action); | |
44 | end: | |
45 | return valid; | |
46 | } | |
47 | ||
48 | struct lttng_trigger *lttng_trigger_create( | |
49 | struct lttng_condition *condition, | |
50 | struct lttng_action *action) | |
51 | { | |
52 | struct lttng_trigger *trigger = NULL; | |
53 | ||
54 | if (!condition || !action) { | |
55 | goto end; | |
56 | } | |
57 | ||
64803277 | 58 | trigger = zmalloc<lttng_trigger>(); |
a58c490f JG |
59 | if (!trigger) { |
60 | goto end; | |
61 | } | |
62 | ||
f01d28b4 JR |
63 | urcu_ref_init(&trigger->ref); |
64 | ||
7ca172c1 | 65 | lttng_condition_get(condition); |
a58c490f | 66 | trigger->condition = condition; |
7ca172c1 JR |
67 | |
68 | lttng_action_get(action); | |
a58c490f | 69 | trigger->action = action; |
3da864a9 | 70 | |
9c374932 JR |
71 | pthread_mutex_init(&trigger->lock, NULL); |
72 | trigger->registered = false; | |
73 | ||
a58c490f JG |
74 | end: |
75 | return trigger; | |
76 | } | |
77 | ||
7ca172c1 JR |
78 | /* |
79 | * Note: the lack of reference counting 'get' on the condition object is normal. | |
80 | * This API was exposed as such in 2.11. The client is not expected to call | |
81 | * lttng_condition_destroy on the returned object. | |
82 | */ | |
a58c490f JG |
83 | struct lttng_condition *lttng_trigger_get_condition( |
84 | struct lttng_trigger *trigger) | |
85 | { | |
86 | return trigger ? trigger->condition : NULL; | |
87 | } | |
88 | ||
9b63a4aa JG |
89 | const struct lttng_condition *lttng_trigger_get_const_condition( |
90 | const struct lttng_trigger *trigger) | |
91 | { | |
0de2479d | 92 | return trigger ? trigger->condition : NULL; |
9b63a4aa JG |
93 | } |
94 | ||
7ca172c1 JR |
95 | /* |
96 | * Note: the lack of reference counting 'get' on the action object is normal. | |
97 | * This API was exposed as such in 2.11. The client is not expected to call | |
98 | * lttng_action_destroy on the returned object. | |
99 | */ | |
e2ba1c78 | 100 | struct lttng_action *lttng_trigger_get_action( |
a58c490f JG |
101 | struct lttng_trigger *trigger) |
102 | { | |
103 | return trigger ? trigger->action : NULL; | |
104 | } | |
105 | ||
9b63a4aa JG |
106 | const struct lttng_action *lttng_trigger_get_const_action( |
107 | const struct lttng_trigger *trigger) | |
108 | { | |
0de2479d | 109 | return trigger ? trigger->action : NULL; |
9b63a4aa JG |
110 | } |
111 | ||
f01d28b4 | 112 | static void trigger_destroy_ref(struct urcu_ref *ref) |
a58c490f | 113 | { |
f01d28b4 JR |
114 | struct lttng_trigger *trigger = |
115 | container_of(ref, struct lttng_trigger, ref); | |
7ca172c1 JR |
116 | struct lttng_action *action = lttng_trigger_get_action(trigger); |
117 | struct lttng_condition *condition = | |
118 | lttng_trigger_get_condition(trigger); | |
119 | ||
a0377dfe FD |
120 | LTTNG_ASSERT(action); |
121 | LTTNG_ASSERT(condition); | |
7ca172c1 JR |
122 | |
123 | /* Release ownership. */ | |
124 | lttng_action_put(action); | |
125 | lttng_condition_put(condition); | |
126 | ||
9c374932 JR |
127 | pthread_mutex_destroy(&trigger->lock); |
128 | ||
242388e4 | 129 | free(trigger->name); |
a58c490f JG |
130 | free(trigger); |
131 | } | |
132 | ||
f01d28b4 JR |
133 | void lttng_trigger_destroy(struct lttng_trigger *trigger) |
134 | { | |
135 | lttng_trigger_put(trigger); | |
136 | } | |
137 | ||
c0a66c84 JG |
138 | ssize_t lttng_trigger_create_from_payload( |
139 | struct lttng_payload_view *src_view, | |
6808ef55 | 140 | struct lttng_trigger **_trigger) |
a58c490f | 141 | { |
242388e4 | 142 | ssize_t ret, offset = 0, condition_size, action_size, name_size = 0; |
a58c490f JG |
143 | struct lttng_condition *condition = NULL; |
144 | struct lttng_action *action = NULL; | |
145 | const struct lttng_trigger_comm *trigger_comm; | |
242388e4 | 146 | const char *name = NULL; |
64eafdf6 JR |
147 | struct lttng_credentials creds = { |
148 | .uid = LTTNG_OPTIONAL_INIT_UNSET, | |
149 | .gid = LTTNG_OPTIONAL_INIT_UNSET, | |
150 | }; | |
6808ef55 | 151 | struct lttng_trigger *trigger = NULL; |
3e6e0df2 JG |
152 | const struct lttng_payload_view trigger_comm_view = |
153 | lttng_payload_view_from_view( | |
154 | src_view, 0, sizeof(*trigger_comm)); | |
a58c490f | 155 | |
6808ef55 | 156 | if (!src_view || !_trigger) { |
a58c490f JG |
157 | ret = -1; |
158 | goto end; | |
159 | } | |
160 | ||
3e6e0df2 JG |
161 | if (!lttng_payload_view_is_valid(&trigger_comm_view)) { |
162 | /* Payload not large enough to contain the header. */ | |
163 | ret = -1; | |
164 | goto end; | |
165 | } | |
166 | ||
a58c490f | 167 | /* lttng_trigger_comm header */ |
3e6e0df2 | 168 | trigger_comm = (typeof(trigger_comm)) trigger_comm_view.buffer.data; |
64eafdf6 JR |
169 | |
170 | /* Set the trigger's creds. */ | |
171 | if (trigger_comm->uid > (uint64_t) ((uid_t) -1)) { | |
172 | /* UID out of range for this platform. */ | |
173 | ret = -1; | |
174 | goto end; | |
175 | } | |
176 | ||
177 | LTTNG_OPTIONAL_SET(&creds.uid, trigger_comm->uid); | |
178 | ||
a58c490f | 179 | offset += sizeof(*trigger_comm); |
242388e4 JR |
180 | |
181 | if (trigger_comm->name_length != 0) { | |
182 | /* Name. */ | |
183 | const struct lttng_payload_view name_view = | |
184 | lttng_payload_view_from_view( | |
3e6e0df2 JG |
185 | src_view, offset, |
186 | trigger_comm->name_length); | |
187 | ||
188 | if (!lttng_payload_view_is_valid(&name_view)) { | |
189 | ret = -1; | |
190 | goto end; | |
191 | } | |
242388e4 JR |
192 | |
193 | name = name_view.buffer.data; | |
194 | if (!lttng_buffer_view_contains_string(&name_view.buffer, name, | |
195 | trigger_comm->name_length)) { | |
196 | ret = -1; | |
197 | goto end; | |
198 | } | |
199 | ||
200 | offset += trigger_comm->name_length; | |
201 | name_size = trigger_comm->name_length; | |
202 | } | |
203 | ||
c0a66c84 JG |
204 | { |
205 | /* struct lttng_condition */ | |
206 | struct lttng_payload_view condition_view = | |
207 | lttng_payload_view_from_view( | |
208 | src_view, offset, -1); | |
209 | ||
210 | condition_size = lttng_condition_create_from_payload(&condition_view, | |
211 | &condition); | |
212 | } | |
a58c490f | 213 | |
a58c490f JG |
214 | if (condition_size < 0) { |
215 | ret = condition_size; | |
216 | goto end; | |
217 | } | |
c0a66c84 | 218 | |
a58c490f | 219 | offset += condition_size; |
c0a66c84 JG |
220 | { |
221 | /* struct lttng_action */ | |
222 | struct lttng_payload_view action_view = | |
223 | lttng_payload_view_from_view( | |
224 | src_view, offset, -1); | |
225 | ||
226 | action_size = lttng_action_create_from_payload(&action_view, &action); | |
227 | } | |
a58c490f | 228 | |
a58c490f JG |
229 | if (action_size < 0) { |
230 | ret = action_size; | |
231 | goto end; | |
232 | } | |
233 | offset += action_size; | |
234 | ||
235 | /* Unexpected size of inner-elements; the buffer is corrupted. */ | |
242388e4 | 236 | if ((ssize_t) trigger_comm->length != condition_size + action_size + name_size) { |
a58c490f JG |
237 | ret = -1; |
238 | goto error; | |
239 | } | |
240 | ||
6808ef55 JG |
241 | trigger = lttng_trigger_create(condition, action); |
242 | if (!trigger) { | |
a58c490f JG |
243 | ret = -1; |
244 | goto error; | |
245 | } | |
c0a66c84 | 246 | |
6808ef55 | 247 | lttng_trigger_set_credentials(trigger, &creds); |
64eafdf6 | 248 | |
7ca172c1 JR |
249 | /* |
250 | * The trigger object owns references to the action and condition | |
251 | * objects. | |
252 | */ | |
253 | lttng_condition_put(condition); | |
254 | condition = NULL; | |
255 | ||
256 | lttng_action_put(action); | |
257 | action = NULL; | |
258 | ||
242388e4 JR |
259 | if (name) { |
260 | const enum lttng_trigger_status status = | |
6808ef55 | 261 | lttng_trigger_set_name(trigger, name); |
242388e4 JR |
262 | |
263 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
264 | ret = -1; | |
265 | goto end; | |
266 | } | |
267 | } | |
268 | ||
a58c490f | 269 | ret = offset; |
7ca172c1 | 270 | |
a58c490f | 271 | error: |
1065801b JG |
272 | lttng_condition_put(condition); |
273 | lttng_action_put(action); | |
7ca172c1 | 274 | end: |
f5d98ed9 | 275 | if (ret >= 0) { |
6808ef55 JG |
276 | *_trigger = trigger; |
277 | } else { | |
278 | lttng_trigger_put(trigger); | |
279 | } | |
280 | ||
a58c490f JG |
281 | return ret; |
282 | } | |
283 | ||
284 | /* | |
a58c490f JG |
285 | * Both elements are stored contiguously, see their "*_comm" structure |
286 | * for the detailed format. | |
287 | */ | |
a02903c0 | 288 | int lttng_trigger_serialize(const struct lttng_trigger *trigger, |
c0a66c84 | 289 | struct lttng_payload *payload) |
a58c490f | 290 | { |
3647288f | 291 | int ret; |
242388e4 | 292 | size_t header_offset, size_before_payload, size_name; |
c0a66c84 | 293 | struct lttng_trigger_comm trigger_comm = {}; |
3647288f | 294 | struct lttng_trigger_comm *header; |
64eafdf6 JR |
295 | const struct lttng_credentials *creds = NULL; |
296 | ||
297 | creds = lttng_trigger_get_credentials(trigger); | |
a0377dfe | 298 | LTTNG_ASSERT(creds); |
64eafdf6 JR |
299 | |
300 | trigger_comm.uid = LTTNG_OPTIONAL_GET(creds->uid); | |
a58c490f | 301 | |
242388e4 JR |
302 | if (trigger->name != NULL) { |
303 | size_name = strlen(trigger->name) + 1; | |
304 | } else { | |
305 | size_name = 0; | |
306 | } | |
307 | ||
308 | trigger_comm.name_length = size_name; | |
309 | ||
c0a66c84 JG |
310 | header_offset = payload->buffer.size; |
311 | ret = lttng_dynamic_buffer_append(&payload->buffer, &trigger_comm, | |
3647288f JG |
312 | sizeof(trigger_comm)); |
313 | if (ret) { | |
a58c490f JG |
314 | goto end; |
315 | } | |
316 | ||
c0a66c84 | 317 | size_before_payload = payload->buffer.size; |
242388e4 JR |
318 | |
319 | /* Trigger name. */ | |
320 | ret = lttng_dynamic_buffer_append( | |
321 | &payload->buffer, trigger->name, size_name); | |
322 | if (ret) { | |
323 | goto end; | |
324 | } | |
325 | ||
c0a66c84 | 326 | ret = lttng_condition_serialize(trigger->condition, payload); |
3647288f | 327 | if (ret) { |
a58c490f JG |
328 | goto end; |
329 | } | |
a58c490f | 330 | |
c0a66c84 | 331 | ret = lttng_action_serialize(trigger->action, payload); |
3647288f | 332 | if (ret) { |
a58c490f JG |
333 | goto end; |
334 | } | |
a58c490f | 335 | |
3647288f | 336 | /* Update payload size. */ |
c0a66c84 JG |
337 | header = (typeof(header)) (payload->buffer.data + header_offset); |
338 | header->length = payload->buffer.size - size_before_payload; | |
a58c490f JG |
339 | end: |
340 | return ret; | |
341 | } | |
3da864a9 | 342 | |
85c06c44 JR |
343 | bool lttng_trigger_is_equal( |
344 | const struct lttng_trigger *a, const struct lttng_trigger *b) | |
345 | { | |
0efb2ad7 JG |
346 | if (!!a->name != !!b->name) { |
347 | /* Both must be either anonymous or named. */ | |
348 | return false; | |
349 | } | |
350 | ||
351 | if (a->name && strcmp(a->name, b->name) != 0) { | |
1ca78886 FD |
352 | return false; |
353 | } | |
354 | ||
85c06c44 JR |
355 | if (!lttng_condition_is_equal(a->condition, b->condition)) { |
356 | return false; | |
357 | } | |
358 | ||
359 | if (!lttng_action_is_equal(a->action, b->action)) { | |
360 | return false; | |
361 | } | |
362 | ||
363 | if (!lttng_credentials_is_equal(lttng_trigger_get_credentials(a), | |
364 | lttng_trigger_get_credentials(b))) { | |
365 | return false; | |
366 | } | |
367 | ||
f2bda80e JG |
368 | if (a->is_hidden != b->is_hidden) { |
369 | return false; | |
370 | } | |
371 | ||
85c06c44 JR |
372 | return true; |
373 | } | |
374 | ||
f2bda80e JG |
375 | bool lttng_trigger_is_hidden(const struct lttng_trigger *trigger) |
376 | { | |
6ce1601f | 377 | LTTNG_ASSERT(trigger); |
f2bda80e JG |
378 | return trigger->is_hidden; |
379 | } | |
380 | ||
f2bda80e JG |
381 | void lttng_trigger_set_hidden(struct lttng_trigger *trigger) |
382 | { | |
a0377dfe | 383 | LTTNG_ASSERT(!trigger->is_hidden); |
f2bda80e JG |
384 | trigger->is_hidden = true; |
385 | } | |
386 | ||
242388e4 JR |
387 | enum lttng_trigger_status lttng_trigger_set_name(struct lttng_trigger *trigger, |
388 | const char* name) | |
389 | { | |
390 | char *name_copy = NULL; | |
391 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
392 | ||
a5c2d2a7 | 393 | if (!trigger) { |
242388e4 JR |
394 | status = LTTNG_TRIGGER_STATUS_INVALID; |
395 | goto end; | |
396 | } | |
397 | ||
a5c2d2a7 JG |
398 | if (name) { |
399 | name_copy = strdup(name); | |
400 | if (!name_copy) { | |
401 | status = LTTNG_TRIGGER_STATUS_ERROR; | |
402 | goto end; | |
403 | } | |
242388e4 JR |
404 | } |
405 | ||
406 | free(trigger->name); | |
407 | ||
408 | trigger->name = name_copy; | |
409 | name_copy = NULL; | |
410 | end: | |
411 | return status; | |
412 | } | |
413 | ||
414 | enum lttng_trigger_status lttng_trigger_get_name( | |
415 | const struct lttng_trigger *trigger, const char **name) | |
416 | { | |
417 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
418 | ||
419 | if (!trigger || !name) { | |
420 | status = LTTNG_TRIGGER_STATUS_INVALID; | |
421 | goto end; | |
422 | } | |
423 | ||
424 | if (!trigger->name) { | |
425 | status = LTTNG_TRIGGER_STATUS_UNSET; | |
426 | } | |
427 | ||
428 | *name = trigger->name; | |
429 | end: | |
430 | return status; | |
431 | } | |
432 | ||
242388e4 JR |
433 | int lttng_trigger_assign_name(struct lttng_trigger *dst, |
434 | const struct lttng_trigger *src) | |
435 | { | |
436 | int ret = 0; | |
437 | enum lttng_trigger_status status; | |
438 | ||
439 | status = lttng_trigger_set_name(dst, src->name); | |
440 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
441 | ret = -1; | |
442 | ERR("Failed to set name for trigger"); | |
443 | goto end; | |
444 | } | |
445 | end: | |
446 | return ret; | |
447 | } | |
448 | ||
e6887944 JR |
449 | void lttng_trigger_set_tracer_token(struct lttng_trigger *trigger, |
450 | uint64_t token) | |
451 | { | |
a0377dfe | 452 | LTTNG_ASSERT(trigger); |
e6887944 JR |
453 | LTTNG_OPTIONAL_SET(&trigger->tracer_token, token); |
454 | } | |
455 | ||
e6887944 JR |
456 | uint64_t lttng_trigger_get_tracer_token(const struct lttng_trigger *trigger) |
457 | { | |
a0377dfe | 458 | LTTNG_ASSERT(trigger); |
e6887944 JR |
459 | |
460 | return LTTNG_OPTIONAL_GET(trigger->tracer_token); | |
461 | } | |
462 | ||
242388e4 JR |
463 | int lttng_trigger_generate_name(struct lttng_trigger *trigger, |
464 | uint64_t unique_id) | |
465 | { | |
466 | int ret = 0; | |
467 | char *generated_name = NULL; | |
468 | ||
80ea4bfa | 469 | ret = asprintf(&generated_name, "trigger%" PRIu64 "", unique_id); |
242388e4 JR |
470 | if (ret < 0) { |
471 | ERR("Failed to generate trigger name"); | |
472 | ret = -1; | |
473 | goto end; | |
474 | } | |
475 | ||
476 | ret = 0; | |
477 | free(trigger->name); | |
478 | trigger->name = generated_name; | |
479 | end: | |
480 | return ret; | |
481 | } | |
482 | ||
f01d28b4 JR |
483 | void lttng_trigger_get(struct lttng_trigger *trigger) |
484 | { | |
485 | urcu_ref_get(&trigger->ref); | |
486 | } | |
487 | ||
f01d28b4 JR |
488 | void lttng_trigger_put(struct lttng_trigger *trigger) |
489 | { | |
490 | if (!trigger) { | |
491 | return; | |
492 | } | |
493 | ||
494 | urcu_ref_put(&trigger->ref , trigger_destroy_ref); | |
495 | } | |
496 | ||
a02903c0 JR |
497 | static void delete_trigger_array_element(void *ptr) |
498 | { | |
a6bc4ca9 | 499 | struct lttng_trigger *trigger = (lttng_trigger *) ptr; |
a02903c0 JR |
500 | |
501 | lttng_trigger_put(trigger); | |
502 | } | |
503 | ||
a02903c0 JR |
504 | struct lttng_triggers *lttng_triggers_create(void) |
505 | { | |
506 | struct lttng_triggers *triggers = NULL; | |
507 | ||
64803277 | 508 | triggers = zmalloc<lttng_triggers>(); |
a02903c0 JR |
509 | if (!triggers) { |
510 | goto end; | |
511 | } | |
512 | ||
513 | lttng_dynamic_pointer_array_init(&triggers->array, delete_trigger_array_element); | |
514 | ||
515 | end: | |
516 | return triggers; | |
517 | } | |
518 | ||
a02903c0 JR |
519 | struct lttng_trigger *lttng_triggers_borrow_mutable_at_index( |
520 | const struct lttng_triggers *triggers, unsigned int index) | |
521 | { | |
522 | struct lttng_trigger *trigger = NULL; | |
523 | ||
a0377dfe | 524 | LTTNG_ASSERT(triggers); |
a02903c0 JR |
525 | if (index >= lttng_dynamic_pointer_array_get_count(&triggers->array)) { |
526 | goto end; | |
527 | } | |
528 | ||
529 | trigger = (struct lttng_trigger *) | |
530 | lttng_dynamic_pointer_array_get_pointer( | |
531 | &triggers->array, index); | |
532 | end: | |
533 | return trigger; | |
534 | } | |
535 | ||
a02903c0 JR |
536 | int lttng_triggers_add( |
537 | struct lttng_triggers *triggers, struct lttng_trigger *trigger) | |
538 | { | |
539 | int ret; | |
540 | ||
a0377dfe FD |
541 | LTTNG_ASSERT(triggers); |
542 | LTTNG_ASSERT(trigger); | |
a02903c0 JR |
543 | |
544 | lttng_trigger_get(trigger); | |
545 | ||
546 | ret = lttng_dynamic_pointer_array_add_pointer(&triggers->array, trigger); | |
547 | if (ret) { | |
548 | lttng_trigger_put(trigger); | |
549 | } | |
550 | ||
551 | return ret; | |
552 | } | |
553 | ||
f2bda80e JG |
554 | int lttng_triggers_remove_hidden_triggers(struct lttng_triggers *triggers) |
555 | { | |
556 | int ret; | |
557 | unsigned int trigger_count, i = 0; | |
558 | enum lttng_trigger_status trigger_status; | |
559 | ||
a0377dfe | 560 | LTTNG_ASSERT(triggers); |
f2bda80e JG |
561 | |
562 | trigger_status = lttng_triggers_get_count(triggers, &trigger_count); | |
a0377dfe | 563 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
f2bda80e JG |
564 | |
565 | while (i < trigger_count) { | |
566 | const struct lttng_trigger *trigger = | |
567 | lttng_triggers_get_at_index(triggers, i); | |
568 | ||
569 | if (lttng_trigger_is_hidden(trigger)) { | |
570 | ret = lttng_dynamic_pointer_array_remove_pointer( | |
571 | &triggers->array, i); | |
572 | if (ret) { | |
573 | goto end; | |
574 | } | |
575 | ||
576 | trigger_count--; | |
577 | } else { | |
578 | i++; | |
579 | } | |
580 | } | |
581 | ||
582 | ret = 0; | |
583 | end: | |
584 | return ret; | |
585 | } | |
586 | ||
a02903c0 JR |
587 | const struct lttng_trigger *lttng_triggers_get_at_index( |
588 | const struct lttng_triggers *triggers, unsigned int index) | |
589 | { | |
590 | return lttng_triggers_borrow_mutable_at_index(triggers, index); | |
591 | } | |
592 | ||
593 | enum lttng_trigger_status lttng_triggers_get_count(const struct lttng_triggers *triggers, unsigned int *count) | |
594 | { | |
595 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
596 | ||
597 | if (!triggers || !count) { | |
598 | status = LTTNG_TRIGGER_STATUS_INVALID; | |
599 | goto end; | |
600 | } | |
601 | ||
602 | *count = lttng_dynamic_pointer_array_get_count(&triggers->array); | |
603 | end: | |
604 | return status; | |
605 | } | |
606 | ||
607 | void lttng_triggers_destroy(struct lttng_triggers *triggers) | |
608 | { | |
609 | if (!triggers) { | |
610 | return; | |
611 | } | |
612 | ||
613 | lttng_dynamic_pointer_array_reset(&triggers->array); | |
614 | free(triggers); | |
615 | } | |
616 | ||
617 | int lttng_triggers_serialize(const struct lttng_triggers *triggers, | |
618 | struct lttng_payload *payload) | |
619 | { | |
620 | int ret; | |
621 | unsigned int i, count; | |
622 | size_t size_before_payload; | |
623 | struct lttng_triggers_comm triggers_comm = {}; | |
624 | struct lttng_triggers_comm *header; | |
625 | enum lttng_trigger_status status; | |
626 | const size_t header_offset = payload->buffer.size; | |
627 | ||
628 | status = lttng_triggers_get_count(triggers, &count); | |
629 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
630 | ret = LTTNG_ERR_INVALID; | |
631 | goto end; | |
632 | } | |
633 | ||
634 | triggers_comm.count = count; | |
635 | ||
636 | /* Placeholder header; updated at the end. */ | |
637 | ret = lttng_dynamic_buffer_append(&payload->buffer, &triggers_comm, | |
638 | sizeof(triggers_comm)); | |
639 | if (ret) { | |
640 | goto end; | |
641 | } | |
642 | ||
643 | size_before_payload = payload->buffer.size; | |
644 | ||
645 | for (i = 0; i < count; i++) { | |
646 | const struct lttng_trigger *trigger = | |
647 | lttng_triggers_get_at_index(triggers, i); | |
648 | ||
a0377dfe | 649 | LTTNG_ASSERT(trigger); |
a02903c0 JR |
650 | |
651 | ret = lttng_trigger_serialize(trigger, payload); | |
652 | if (ret) { | |
653 | goto end; | |
654 | } | |
655 | } | |
656 | ||
657 | /* Update payload size. */ | |
658 | header = (struct lttng_triggers_comm *) ((char *) payload->buffer.data + header_offset); | |
659 | header->length = payload->buffer.size - size_before_payload; | |
660 | end: | |
661 | return ret; | |
662 | } | |
663 | ||
a02903c0 JR |
664 | ssize_t lttng_triggers_create_from_payload( |
665 | struct lttng_payload_view *src_view, | |
666 | struct lttng_triggers **triggers) | |
667 | { | |
668 | ssize_t ret, offset = 0, triggers_size = 0; | |
669 | unsigned int i; | |
670 | const struct lttng_triggers_comm *triggers_comm; | |
671 | struct lttng_triggers *local_triggers = NULL; | |
672 | ||
673 | if (!src_view || !triggers) { | |
674 | ret = -1; | |
675 | goto error; | |
676 | } | |
677 | ||
678 | /* lttng_trigger_comms header */ | |
679 | triggers_comm = (const struct lttng_triggers_comm *) src_view->buffer.data; | |
680 | offset += sizeof(*triggers_comm); | |
681 | ||
682 | local_triggers = lttng_triggers_create(); | |
683 | if (!local_triggers) { | |
684 | ret = -1; | |
685 | goto error; | |
686 | } | |
687 | ||
688 | for (i = 0; i < triggers_comm->count; i++) { | |
689 | struct lttng_trigger *trigger = NULL; | |
690 | struct lttng_payload_view trigger_view = | |
691 | lttng_payload_view_from_view(src_view, offset, -1); | |
692 | ssize_t trigger_size; | |
693 | ||
694 | trigger_size = lttng_trigger_create_from_payload( | |
695 | &trigger_view, &trigger); | |
696 | if (trigger_size < 0) { | |
697 | ret = trigger_size; | |
698 | goto error; | |
699 | } | |
700 | ||
701 | /* Transfer ownership of the trigger to the collection. */ | |
702 | ret = lttng_triggers_add(local_triggers, trigger); | |
703 | lttng_trigger_put(trigger); | |
704 | if (ret < 0) { | |
705 | ret = -1; | |
706 | goto error; | |
707 | } | |
708 | ||
709 | offset += trigger_size; | |
710 | triggers_size += trigger_size; | |
711 | } | |
712 | ||
713 | /* Unexpected size of inner-elements; the buffer is corrupted. */ | |
714 | if ((ssize_t) triggers_comm->length != triggers_size) { | |
715 | ret = -1; | |
716 | goto error; | |
717 | } | |
718 | ||
719 | /* Pass ownership to caller. */ | |
720 | *triggers = local_triggers; | |
721 | local_triggers = NULL; | |
722 | ||
723 | ret = offset; | |
724 | error: | |
725 | ||
726 | lttng_triggers_destroy(local_triggers); | |
727 | return ret; | |
728 | } | |
729 | ||
3da864a9 JR |
730 | const struct lttng_credentials *lttng_trigger_get_credentials( |
731 | const struct lttng_trigger *trigger) | |
732 | { | |
64eafdf6 | 733 | return &trigger->creds; |
3da864a9 JR |
734 | } |
735 | ||
64eafdf6 | 736 | void lttng_trigger_set_credentials(struct lttng_trigger *trigger, |
3da864a9 JR |
737 | const struct lttng_credentials *creds) |
738 | { | |
a0377dfe | 739 | LTTNG_ASSERT(creds); |
64eafdf6 JR |
740 | trigger->creds = *creds; |
741 | } | |
742 | ||
743 | enum lttng_trigger_status lttng_trigger_set_owner_uid( | |
744 | struct lttng_trigger *trigger, uid_t uid) | |
745 | { | |
746 | enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK; | |
d84c8ae3 | 747 | const uid_t euid = geteuid(); |
64eafdf6 JR |
748 | const struct lttng_credentials creds = { |
749 | .uid = LTTNG_OPTIONAL_INIT_VALUE(uid), | |
750 | .gid = LTTNG_OPTIONAL_INIT_UNSET, | |
751 | }; | |
752 | ||
753 | if (!trigger) { | |
754 | ret = LTTNG_TRIGGER_STATUS_INVALID; | |
755 | goto end; | |
756 | } | |
757 | ||
758 | /* Client-side validation only to report a clearer error. */ | |
d84c8ae3 | 759 | if (euid != 0 && euid != uid) { |
64eafdf6 JR |
760 | ret = LTTNG_TRIGGER_STATUS_PERMISSION_DENIED; |
761 | goto end; | |
762 | } | |
763 | ||
764 | lttng_trigger_set_credentials(trigger, &creds); | |
765 | ||
766 | end: | |
767 | return ret; | |
768 | } | |
769 | ||
770 | enum lttng_trigger_status lttng_trigger_get_owner_uid( | |
771 | const struct lttng_trigger *trigger, uid_t *uid) | |
772 | { | |
773 | enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK; | |
774 | const struct lttng_credentials *creds = NULL; | |
775 | ||
776 | if (!trigger || !uid ) { | |
777 | ret = LTTNG_TRIGGER_STATUS_INVALID; | |
778 | goto end; | |
779 | } | |
780 | ||
781 | if (!trigger->creds.uid.is_set ) { | |
782 | ret = LTTNG_TRIGGER_STATUS_UNSET; | |
783 | goto end; | |
784 | } | |
785 | ||
786 | creds = lttng_trigger_get_credentials(trigger); | |
787 | *uid = lttng_credentials_get_uid(creds); | |
788 | ||
789 | end: | |
790 | return ret; | |
3da864a9 | 791 | } |
5c504c41 | 792 | |
91c96f62 JR |
793 | enum lttng_domain_type lttng_trigger_get_underlying_domain_type_restriction( |
794 | const struct lttng_trigger *trigger) | |
795 | { | |
796 | enum lttng_domain_type type = LTTNG_DOMAIN_NONE; | |
797 | const struct lttng_event_rule *event_rule; | |
798 | enum lttng_condition_status c_status; | |
799 | enum lttng_condition_type c_type; | |
800 | ||
a0377dfe FD |
801 | LTTNG_ASSERT(trigger); |
802 | LTTNG_ASSERT(trigger->condition); | |
91c96f62 JR |
803 | |
804 | c_type = lttng_condition_get_type(trigger->condition); | |
805 | assert (c_type != LTTNG_CONDITION_TYPE_UNKNOWN); | |
806 | ||
807 | switch (c_type) { | |
808 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
809 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
810 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
811 | /* Apply to any domain. */ | |
812 | type = LTTNG_DOMAIN_NONE; | |
813 | break; | |
8dbb86b8 | 814 | case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: |
91c96f62 | 815 | /* Return the domain of the event rule. */ |
8dbb86b8 | 816 | c_status = lttng_condition_event_rule_matches_get_rule( |
91c96f62 | 817 | trigger->condition, &event_rule); |
a0377dfe | 818 | LTTNG_ASSERT(c_status == LTTNG_CONDITION_STATUS_OK); |
91c96f62 JR |
819 | type = lttng_event_rule_get_domain_type(event_rule); |
820 | break; | |
821 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
822 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
823 | /* Return the domain of the channel being monitored. */ | |
824 | c_status = lttng_condition_buffer_usage_get_domain_type( | |
825 | trigger->condition, &type); | |
a0377dfe | 826 | LTTNG_ASSERT(c_status == LTTNG_CONDITION_STATUS_OK); |
91c96f62 JR |
827 | break; |
828 | default: | |
829 | abort(); | |
830 | } | |
831 | ||
832 | return type; | |
833 | } | |
58daac01 JR |
834 | |
835 | /* | |
836 | * Generate bytecode related to the trigger. | |
837 | * On success LTTNG_OK. On error, returns lttng_error code. | |
838 | */ | |
58daac01 JR |
839 | enum lttng_error_code lttng_trigger_generate_bytecode( |
840 | struct lttng_trigger *trigger, | |
841 | const struct lttng_credentials *creds) | |
842 | { | |
843 | enum lttng_error_code ret; | |
844 | struct lttng_condition *condition = NULL; | |
845 | ||
846 | condition = lttng_trigger_get_condition(trigger); | |
847 | if (!condition) { | |
848 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
849 | goto end; | |
850 | } | |
851 | ||
852 | switch (lttng_condition_get_type(condition)) { | |
8dbb86b8 | 853 | case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: |
58daac01 JR |
854 | { |
855 | struct lttng_event_rule *event_rule; | |
856 | const enum lttng_condition_status condition_status = | |
8dbb86b8 JR |
857 | lttng_condition_event_rule_matches_borrow_rule_mutable( |
858 | condition, &event_rule); | |
58daac01 | 859 | |
a0377dfe | 860 | LTTNG_ASSERT(condition_status == LTTNG_CONDITION_STATUS_OK); |
f2e97f59 JR |
861 | |
862 | /* Generate the filter bytecode. */ | |
58daac01 JR |
863 | ret = lttng_event_rule_generate_filter_bytecode( |
864 | event_rule, creds); | |
865 | if (ret != LTTNG_OK) { | |
866 | goto end; | |
867 | } | |
868 | ||
f2e97f59 | 869 | /* Generate the capture bytecode. */ |
8dbb86b8 | 870 | ret = lttng_condition_event_rule_matches_generate_capture_descriptor_bytecode( |
f2e97f59 JR |
871 | condition); |
872 | if (ret != LTTNG_OK) { | |
873 | goto end; | |
874 | } | |
875 | ||
58daac01 JR |
876 | ret = LTTNG_OK; |
877 | break; | |
878 | } | |
879 | default: | |
880 | ret = LTTNG_OK; | |
881 | break; | |
882 | } | |
883 | end: | |
884 | return ret; | |
885 | } | |
b61776fb | 886 | |
b61776fb SM |
887 | struct lttng_trigger *lttng_trigger_copy(const struct lttng_trigger *trigger) |
888 | { | |
889 | int ret; | |
890 | struct lttng_payload copy_buffer; | |
94dbd8e4 JG |
891 | struct lttng_condition *condition_copy = NULL; |
892 | struct lttng_action *action_copy = NULL; | |
b61776fb | 893 | struct lttng_trigger *copy = NULL; |
94dbd8e4 JG |
894 | enum lttng_trigger_status trigger_status; |
895 | const char *trigger_name; | |
896 | uid_t trigger_owner_uid; | |
b61776fb SM |
897 | |
898 | lttng_payload_init(©_buffer); | |
899 | ||
94dbd8e4 | 900 | ret = lttng_condition_serialize(trigger->condition, ©_buffer); |
b61776fb SM |
901 | if (ret < 0) { |
902 | goto end; | |
903 | } | |
904 | ||
905 | { | |
906 | struct lttng_payload_view view = | |
907 | lttng_payload_view_from_payload( | |
908 | ©_buffer, 0, -1); | |
94dbd8e4 JG |
909 | |
910 | ret = lttng_condition_create_from_payload( | |
911 | &view, &condition_copy); | |
912 | if (ret < 0) { | |
913 | goto end; | |
914 | } | |
915 | } | |
916 | ||
917 | lttng_payload_clear(©_buffer); | |
918 | ||
919 | ret = lttng_action_serialize(trigger->action, ©_buffer); | |
920 | if (ret < 0) { | |
921 | goto end; | |
922 | } | |
923 | ||
924 | { | |
925 | struct lttng_payload_view view = | |
926 | lttng_payload_view_from_payload( | |
927 | ©_buffer, 0, -1); | |
928 | ||
929 | ret = lttng_action_create_from_payload( | |
930 | &view, &action_copy); | |
b61776fb | 931 | if (ret < 0) { |
b61776fb SM |
932 | goto end; |
933 | } | |
934 | } | |
935 | ||
94dbd8e4 JG |
936 | copy = lttng_trigger_create(condition_copy, action_copy); |
937 | if (!copy) { | |
938 | ERR("Failed to allocate trigger during trigger copy"); | |
939 | goto end; | |
940 | } | |
941 | ||
942 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); | |
943 | switch (trigger_status) { | |
944 | case LTTNG_TRIGGER_STATUS_OK: | |
945 | trigger_status = lttng_trigger_set_name(copy, trigger_name); | |
946 | if (trigger_status != LTTNG_TRIGGER_STATUS_OK) { | |
947 | ERR("Failed to set name of new trigger during copy"); | |
948 | goto error_cleanup_trigger; | |
949 | } | |
950 | break; | |
951 | case LTTNG_TRIGGER_STATUS_UNSET: | |
952 | break; | |
953 | default: | |
954 | ERR("Failed to get name of original trigger during copy"); | |
955 | goto error_cleanup_trigger; | |
956 | } | |
957 | ||
958 | trigger_status = lttng_trigger_get_owner_uid( | |
959 | trigger, &trigger_owner_uid); | |
960 | switch (trigger_status) { | |
961 | case LTTNG_TRIGGER_STATUS_OK: | |
962 | LTTNG_OPTIONAL_SET(©->creds.uid, trigger_owner_uid); | |
963 | break; | |
964 | case LTTNG_TRIGGER_STATUS_UNSET: | |
965 | break; | |
966 | default: | |
967 | ERR("Failed to get owner uid of original trigger during copy"); | |
968 | goto error_cleanup_trigger; | |
969 | } | |
970 | ||
971 | copy->tracer_token = trigger->tracer_token; | |
972 | copy->registered = trigger->registered; | |
f2bda80e | 973 | copy->is_hidden = trigger->is_hidden; |
94dbd8e4 JG |
974 | goto end; |
975 | ||
976 | error_cleanup_trigger: | |
977 | lttng_trigger_destroy(copy); | |
978 | copy = NULL; | |
b61776fb | 979 | end: |
94dbd8e4 JG |
980 | lttng_condition_put(condition_copy); |
981 | lttng_action_put(action_copy); | |
b61776fb SM |
982 | lttng_payload_reset(©_buffer); |
983 | return copy; | |
984 | } | |
c738df17 | 985 | |
c738df17 FD |
986 | bool lttng_trigger_needs_tracer_notifier(const struct lttng_trigger *trigger) |
987 | { | |
988 | bool needs_tracer_notifier = false; | |
989 | const struct lttng_condition *condition = | |
990 | lttng_trigger_get_const_condition(trigger); | |
991 | ||
992 | switch (lttng_condition_get_type(condition)) { | |
8dbb86b8 | 993 | case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: |
c738df17 FD |
994 | needs_tracer_notifier = true; |
995 | goto end; | |
996 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
997 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
998 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
999 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1000 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1001 | goto end; | |
1002 | case LTTNG_CONDITION_TYPE_UNKNOWN: | |
1003 | default: | |
1004 | abort(); | |
1005 | } | |
1006 | end: | |
1007 | return needs_tracer_notifier; | |
1008 | } | |
9c374932 | 1009 | |
9c374932 JR |
1010 | void lttng_trigger_set_as_registered(struct lttng_trigger *trigger) |
1011 | { | |
1012 | pthread_mutex_lock(&trigger->lock); | |
1013 | trigger->registered = true; | |
1014 | pthread_mutex_unlock(&trigger->lock); | |
1015 | } | |
1016 | ||
9c374932 JR |
1017 | void lttng_trigger_set_as_unregistered(struct lttng_trigger *trigger) |
1018 | { | |
1019 | pthread_mutex_lock(&trigger->lock); | |
1020 | trigger->registered = false; | |
1021 | pthread_mutex_unlock(&trigger->lock); | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * The trigger must be locked before calling lttng_trigger_registered. | |
1026 | * The lock is necessary since a trigger can be unregistered at anytime. | |
1027 | * Manipulations requiring that the trigger be registered must always acquire | |
1028 | * the trigger lock for the duration of the manipulation using | |
1029 | * `lttng_trigger_lock` and `lttng_trigger_unlock`. | |
1030 | */ | |
9c374932 JR |
1031 | bool lttng_trigger_is_registered(struct lttng_trigger *trigger) |
1032 | { | |
1033 | ASSERT_LOCKED(trigger->lock); | |
1034 | return trigger->registered; | |
1035 | } | |
1036 | ||
9c374932 JR |
1037 | void lttng_trigger_lock(struct lttng_trigger *trigger) |
1038 | { | |
1039 | pthread_mutex_lock(&trigger->lock); | |
1040 | } | |
1041 | ||
9c374932 JR |
1042 | void lttng_trigger_unlock(struct lttng_trigger *trigger) |
1043 | { | |
1044 | pthread_mutex_unlock(&trigger->lock); | |
1045 | } | |
6a751b95 | 1046 | |
6a751b95 JR |
1047 | enum lttng_error_code lttng_trigger_mi_serialize(const struct lttng_trigger *trigger, |
1048 | struct mi_writer *writer, | |
1049 | const struct mi_lttng_error_query_callbacks | |
1050 | *error_query_callbacks) | |
1051 | { | |
1052 | int ret; | |
1053 | enum lttng_error_code ret_code; | |
1054 | enum lttng_trigger_status trigger_status; | |
1055 | const struct lttng_condition *condition = NULL; | |
1056 | const struct lttng_action *action = NULL; | |
1057 | struct lttng_dynamic_array action_path_indexes; | |
1058 | uid_t owner_uid; | |
1059 | ||
a0377dfe FD |
1060 | LTTNG_ASSERT(trigger); |
1061 | LTTNG_ASSERT(writer); | |
6a751b95 JR |
1062 | |
1063 | lttng_dynamic_array_init(&action_path_indexes, sizeof(uint64_t), NULL); | |
1064 | ||
1065 | /* Open trigger element. */ | |
1066 | ret = mi_lttng_writer_open_element(writer, mi_lttng_element_trigger); | |
1067 | if (ret) { | |
1068 | goto mi_error; | |
1069 | } | |
1070 | ||
1071 | trigger_status = lttng_trigger_get_owner_uid(trigger, &owner_uid); | |
a0377dfe | 1072 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
6a751b95 JR |
1073 | |
1074 | /* Name. */ | |
1075 | ret = mi_lttng_writer_write_element_string( | |
1076 | writer, config_element_name, trigger->name); | |
1077 | if (ret) { | |
1078 | goto mi_error; | |
1079 | } | |
1080 | ||
1081 | /* Owner uid. */ | |
1082 | ret = mi_lttng_writer_write_element_signed_int(writer, | |
1083 | mi_lttng_element_trigger_owner_uid, | |
1084 | (int64_t) owner_uid); | |
1085 | if (ret) { | |
1086 | goto mi_error; | |
1087 | } | |
1088 | ||
1089 | /* Condition. */ | |
1090 | condition = lttng_trigger_get_const_condition(trigger); | |
a0377dfe | 1091 | LTTNG_ASSERT(condition); |
6a751b95 JR |
1092 | ret_code = lttng_condition_mi_serialize( |
1093 | trigger, condition, writer, error_query_callbacks); | |
1094 | if (ret_code != LTTNG_OK) { | |
1095 | goto end; | |
1096 | } | |
1097 | ||
1098 | /* Action. */ | |
1099 | action = lttng_trigger_get_const_action(trigger); | |
a0377dfe | 1100 | LTTNG_ASSERT(action); |
6a751b95 JR |
1101 | ret_code = lttng_action_mi_serialize(trigger, action, writer, |
1102 | error_query_callbacks, &action_path_indexes); | |
1103 | if (ret_code != LTTNG_OK) { | |
1104 | goto end; | |
1105 | } | |
1106 | ||
1107 | if (error_query_callbacks && error_query_callbacks->trigger_cb) { | |
1108 | struct lttng_error_query_results *results = NULL; | |
1109 | ||
1110 | ret_code = error_query_callbacks->trigger_cb(trigger, &results); | |
1111 | if (ret_code != LTTNG_OK) { | |
1112 | goto end; | |
1113 | } | |
1114 | ||
1115 | ret_code = lttng_error_query_results_mi_serialize( | |
1116 | results, writer); | |
1117 | lttng_error_query_results_destroy(results); | |
1118 | if (ret_code != LTTNG_OK) { | |
1119 | goto end; | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | /* Close trigger element. */ | |
1124 | ret = mi_lttng_writer_close_element(writer); | |
1125 | if (ret) { | |
1126 | goto mi_error; | |
1127 | } | |
1128 | ||
1129 | ret_code = LTTNG_OK; | |
1130 | goto end; | |
1131 | ||
1132 | mi_error: | |
1133 | ret_code = LTTNG_ERR_MI_IO_FAIL; | |
1134 | end: | |
1135 | lttng_dynamic_array_reset(&action_path_indexes); | |
1136 | return ret_code; | |
1137 | } | |
1138 | ||
1139 | /* Used by qsort, which expects the semantics of strcmp(). */ | |
1140 | static int compare_triggers_by_name(const void *a, const void *b) | |
1141 | { | |
1142 | const struct lttng_trigger *trigger_a = | |
1143 | *((const struct lttng_trigger **) a); | |
1144 | const struct lttng_trigger *trigger_b = | |
1145 | *((const struct lttng_trigger **) b); | |
1146 | const char *name_a, *name_b; | |
1147 | enum lttng_trigger_status trigger_status; | |
1148 | ||
1149 | /* Anonymous triggers are not reachable here. */ | |
1150 | trigger_status = lttng_trigger_get_name(trigger_a, &name_a); | |
a0377dfe | 1151 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
6a751b95 JR |
1152 | |
1153 | trigger_status = lttng_trigger_get_name(trigger_b, &name_b); | |
a0377dfe | 1154 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
6a751b95 JR |
1155 | |
1156 | return strcmp(name_a, name_b); | |
1157 | } | |
1158 | ||
6a751b95 JR |
1159 | enum lttng_error_code lttng_triggers_mi_serialize(const struct lttng_triggers *triggers, |
1160 | struct mi_writer *writer, | |
1161 | const struct mi_lttng_error_query_callbacks | |
1162 | *error_query_callbacks) | |
1163 | { | |
1164 | int ret; | |
1165 | enum lttng_error_code ret_code; | |
1166 | enum lttng_trigger_status status; | |
1167 | unsigned int count, i; | |
1168 | struct lttng_dynamic_pointer_array sorted_triggers; | |
1169 | ||
a0377dfe FD |
1170 | LTTNG_ASSERT(triggers); |
1171 | LTTNG_ASSERT(writer); | |
6a751b95 JR |
1172 | |
1173 | /* | |
1174 | * Sort trigger by name to ensure an order at the MI level and ignore | |
1175 | * any anonymous trigger present. | |
1176 | */ | |
1177 | lttng_dynamic_pointer_array_init(&sorted_triggers, NULL); | |
1178 | ||
1179 | status = lttng_triggers_get_count(triggers, &count); | |
a0377dfe | 1180 | LTTNG_ASSERT(status == LTTNG_TRIGGER_STATUS_OK); |
6a751b95 JR |
1181 | |
1182 | for (i = 0; i < count; i++) { | |
1183 | int add_ret; | |
1184 | const char *unused_name; | |
1185 | const struct lttng_trigger *trigger = | |
1186 | lttng_triggers_get_at_index(triggers, i); | |
1187 | ||
1188 | status = lttng_trigger_get_name(trigger, &unused_name); | |
1189 | switch (status) { | |
1190 | case LTTNG_TRIGGER_STATUS_OK: | |
1191 | break; | |
1192 | case LTTNG_TRIGGER_STATUS_UNSET: | |
1193 | /* Don't list anonymous triggers. */ | |
1194 | continue; | |
1195 | default: | |
1196 | abort(); | |
1197 | } | |
1198 | ||
1199 | add_ret = lttng_dynamic_pointer_array_add_pointer( | |
1200 | &sorted_triggers, (void *) trigger); | |
1201 | ||
1202 | if (add_ret) { | |
1203 | ERR("Failed to lttng_trigger to sorting array."); | |
1204 | ret_code = LTTNG_ERR_NOMEM; | |
1205 | goto error; | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | qsort(sorted_triggers.array.buffer.data, count, | |
1210 | sizeof(struct lttng_trigger *), | |
1211 | compare_triggers_by_name); | |
1212 | ||
1213 | /* Open triggers element. */ | |
1214 | ret = mi_lttng_writer_open_element(writer, mi_lttng_element_triggers); | |
1215 | if (ret) { | |
1216 | ret_code = LTTNG_ERR_MI_IO_FAIL; | |
1217 | goto error; | |
1218 | } | |
1219 | ||
1220 | for (i = 0; i < lttng_dynamic_pointer_array_get_count(&sorted_triggers); i++) { | |
1221 | const struct lttng_trigger *trigger = | |
1222 | (const struct lttng_trigger *) | |
1223 | lttng_dynamic_pointer_array_get_pointer( | |
1224 | &sorted_triggers, i); | |
1225 | ||
1226 | lttng_trigger_mi_serialize(trigger, writer, error_query_callbacks); | |
1227 | } | |
1228 | ||
1229 | /* Close triggers element. */ | |
1230 | ret = mi_lttng_writer_close_element(writer); | |
1231 | if (ret) { | |
1232 | ret_code = LTTNG_ERR_MI_IO_FAIL; | |
1233 | goto error; | |
1234 | } | |
1235 | ||
1236 | ret_code = LTTNG_OK; | |
1237 | ||
1238 | error: | |
1239 | lttng_dynamic_pointer_array_reset(&sorted_triggers); | |
1240 | return ret_code; | |
1241 | } |