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 | ||
9c374932 | 8 | #include <assert.h> |
3da864a9 | 9 | #include <common/credentials.h> |
a02903c0 | 10 | #include <common/dynamic-array.h> |
9c374932 | 11 | #include <common/error.h> |
0f7c2963 | 12 | #include <common/mi-lttng.h> |
3da864a9 | 13 | #include <common/optional.h> |
9c374932 JR |
14 | #include <common/payload-view.h> |
15 | #include <common/payload.h> | |
242388e4 | 16 | #include <inttypes.h> |
9c374932 JR |
17 | #include <lttng/action/action-internal.h> |
18 | #include <lttng/condition/buffer-usage.h> | |
19 | #include <lttng/condition/condition-internal.h> | |
670a26e4 JR |
20 | #include <lttng/condition/event-rule-matches-internal.h> |
21 | #include <lttng/condition/event-rule-matches.h> | |
9c374932 | 22 | #include <lttng/domain.h> |
0f7c2963 | 23 | #include <lttng/error-query-internal.h> |
9c374932 JR |
24 | #include <lttng/event-expr-internal.h> |
25 | #include <lttng/event-rule/event-rule-internal.h> | |
26 | #include <lttng/trigger/trigger-internal.h> | |
27 | #include <pthread.h> | |
a58c490f JG |
28 | |
29 | LTTNG_HIDDEN | |
b61776fb | 30 | bool lttng_trigger_validate(const struct lttng_trigger *trigger) |
a58c490f JG |
31 | { |
32 | bool valid; | |
33 | ||
34 | if (!trigger) { | |
35 | valid = false; | |
36 | goto end; | |
37 | } | |
38 | ||
64eafdf6 JR |
39 | if (!trigger->creds.uid.is_set) { |
40 | valid = false; | |
41 | goto end; | |
42 | } | |
43 | ||
a58c490f JG |
44 | valid = lttng_condition_validate(trigger->condition) && |
45 | lttng_action_validate(trigger->action); | |
46 | end: | |
47 | return valid; | |
48 | } | |
49 | ||
50 | struct lttng_trigger *lttng_trigger_create( | |
51 | struct lttng_condition *condition, | |
52 | struct lttng_action *action) | |
53 | { | |
54 | struct lttng_trigger *trigger = NULL; | |
55 | ||
56 | if (!condition || !action) { | |
57 | goto end; | |
58 | } | |
59 | ||
60 | trigger = zmalloc(sizeof(struct lttng_trigger)); | |
61 | if (!trigger) { | |
62 | goto end; | |
63 | } | |
64 | ||
f01d28b4 JR |
65 | urcu_ref_init(&trigger->ref); |
66 | ||
7ca172c1 | 67 | lttng_condition_get(condition); |
a58c490f | 68 | trigger->condition = condition; |
7ca172c1 JR |
69 | |
70 | lttng_action_get(action); | |
a58c490f | 71 | trigger->action = action; |
3da864a9 | 72 | |
9c374932 JR |
73 | pthread_mutex_init(&trigger->lock, NULL); |
74 | trigger->registered = false; | |
75 | ||
a58c490f JG |
76 | end: |
77 | return trigger; | |
78 | } | |
79 | ||
7ca172c1 JR |
80 | /* |
81 | * Note: the lack of reference counting 'get' on the condition object is normal. | |
82 | * This API was exposed as such in 2.11. The client is not expected to call | |
83 | * lttng_condition_destroy on the returned object. | |
84 | */ | |
a58c490f JG |
85 | struct lttng_condition *lttng_trigger_get_condition( |
86 | struct lttng_trigger *trigger) | |
87 | { | |
88 | return trigger ? trigger->condition : NULL; | |
89 | } | |
90 | ||
9b63a4aa JG |
91 | const struct lttng_condition *lttng_trigger_get_const_condition( |
92 | const struct lttng_trigger *trigger) | |
93 | { | |
0de2479d | 94 | return trigger ? trigger->condition : NULL; |
9b63a4aa JG |
95 | } |
96 | ||
7ca172c1 JR |
97 | /* |
98 | * Note: the lack of reference counting 'get' on the action object is normal. | |
99 | * This API was exposed as such in 2.11. The client is not expected to call | |
100 | * lttng_action_destroy on the returned object. | |
101 | */ | |
e2ba1c78 | 102 | struct lttng_action *lttng_trigger_get_action( |
a58c490f JG |
103 | struct lttng_trigger *trigger) |
104 | { | |
105 | return trigger ? trigger->action : NULL; | |
106 | } | |
107 | ||
9b63a4aa JG |
108 | const struct lttng_action *lttng_trigger_get_const_action( |
109 | const struct lttng_trigger *trigger) | |
110 | { | |
0de2479d | 111 | return trigger ? trigger->action : NULL; |
9b63a4aa JG |
112 | } |
113 | ||
f01d28b4 | 114 | static void trigger_destroy_ref(struct urcu_ref *ref) |
a58c490f | 115 | { |
f01d28b4 JR |
116 | struct lttng_trigger *trigger = |
117 | container_of(ref, struct lttng_trigger, ref); | |
7ca172c1 JR |
118 | struct lttng_action *action = lttng_trigger_get_action(trigger); |
119 | struct lttng_condition *condition = | |
120 | lttng_trigger_get_condition(trigger); | |
121 | ||
7ca172c1 JR |
122 | assert(action); |
123 | assert(condition); | |
124 | ||
125 | /* Release ownership. */ | |
126 | lttng_action_put(action); | |
127 | lttng_condition_put(condition); | |
128 | ||
9c374932 JR |
129 | pthread_mutex_destroy(&trigger->lock); |
130 | ||
242388e4 | 131 | free(trigger->name); |
a58c490f JG |
132 | free(trigger); |
133 | } | |
134 | ||
f01d28b4 JR |
135 | void lttng_trigger_destroy(struct lttng_trigger *trigger) |
136 | { | |
137 | lttng_trigger_put(trigger); | |
138 | } | |
139 | ||
a58c490f | 140 | LTTNG_HIDDEN |
c0a66c84 JG |
141 | ssize_t lttng_trigger_create_from_payload( |
142 | struct lttng_payload_view *src_view, | |
6808ef55 | 143 | struct lttng_trigger **_trigger) |
a58c490f | 144 | { |
242388e4 | 145 | ssize_t ret, offset = 0, condition_size, action_size, name_size = 0; |
a58c490f JG |
146 | struct lttng_condition *condition = NULL; |
147 | struct lttng_action *action = NULL; | |
148 | const struct lttng_trigger_comm *trigger_comm; | |
242388e4 | 149 | const char *name = NULL; |
64eafdf6 JR |
150 | struct lttng_credentials creds = { |
151 | .uid = LTTNG_OPTIONAL_INIT_UNSET, | |
152 | .gid = LTTNG_OPTIONAL_INIT_UNSET, | |
153 | }; | |
6808ef55 | 154 | struct lttng_trigger *trigger = NULL; |
3e6e0df2 JG |
155 | const struct lttng_payload_view trigger_comm_view = |
156 | lttng_payload_view_from_view( | |
157 | src_view, 0, sizeof(*trigger_comm)); | |
a58c490f | 158 | |
6808ef55 | 159 | if (!src_view || !_trigger) { |
a58c490f JG |
160 | ret = -1; |
161 | goto end; | |
162 | } | |
163 | ||
3e6e0df2 JG |
164 | if (!lttng_payload_view_is_valid(&trigger_comm_view)) { |
165 | /* Payload not large enough to contain the header. */ | |
166 | ret = -1; | |
167 | goto end; | |
168 | } | |
169 | ||
a58c490f | 170 | /* lttng_trigger_comm header */ |
3e6e0df2 | 171 | trigger_comm = (typeof(trigger_comm)) trigger_comm_view.buffer.data; |
64eafdf6 JR |
172 | |
173 | /* Set the trigger's creds. */ | |
174 | if (trigger_comm->uid > (uint64_t) ((uid_t) -1)) { | |
175 | /* UID out of range for this platform. */ | |
176 | ret = -1; | |
177 | goto end; | |
178 | } | |
179 | ||
180 | LTTNG_OPTIONAL_SET(&creds.uid, trigger_comm->uid); | |
181 | ||
a58c490f | 182 | offset += sizeof(*trigger_comm); |
242388e4 JR |
183 | |
184 | if (trigger_comm->name_length != 0) { | |
185 | /* Name. */ | |
186 | const struct lttng_payload_view name_view = | |
187 | lttng_payload_view_from_view( | |
3e6e0df2 JG |
188 | src_view, offset, |
189 | trigger_comm->name_length); | |
190 | ||
191 | if (!lttng_payload_view_is_valid(&name_view)) { | |
192 | ret = -1; | |
193 | goto end; | |
194 | } | |
242388e4 JR |
195 | |
196 | name = name_view.buffer.data; | |
197 | if (!lttng_buffer_view_contains_string(&name_view.buffer, name, | |
198 | trigger_comm->name_length)) { | |
199 | ret = -1; | |
200 | goto end; | |
201 | } | |
202 | ||
203 | offset += trigger_comm->name_length; | |
204 | name_size = trigger_comm->name_length; | |
205 | } | |
206 | ||
c0a66c84 JG |
207 | { |
208 | /* struct lttng_condition */ | |
209 | struct lttng_payload_view condition_view = | |
210 | lttng_payload_view_from_view( | |
211 | src_view, offset, -1); | |
212 | ||
213 | condition_size = lttng_condition_create_from_payload(&condition_view, | |
214 | &condition); | |
215 | } | |
a58c490f | 216 | |
a58c490f JG |
217 | if (condition_size < 0) { |
218 | ret = condition_size; | |
219 | goto end; | |
220 | } | |
c0a66c84 | 221 | |
a58c490f | 222 | offset += condition_size; |
c0a66c84 JG |
223 | { |
224 | /* struct lttng_action */ | |
225 | struct lttng_payload_view action_view = | |
226 | lttng_payload_view_from_view( | |
227 | src_view, offset, -1); | |
228 | ||
229 | action_size = lttng_action_create_from_payload(&action_view, &action); | |
230 | } | |
a58c490f | 231 | |
a58c490f JG |
232 | if (action_size < 0) { |
233 | ret = action_size; | |
234 | goto end; | |
235 | } | |
236 | offset += action_size; | |
237 | ||
238 | /* Unexpected size of inner-elements; the buffer is corrupted. */ | |
242388e4 | 239 | if ((ssize_t) trigger_comm->length != condition_size + action_size + name_size) { |
a58c490f JG |
240 | ret = -1; |
241 | goto error; | |
242 | } | |
243 | ||
6808ef55 JG |
244 | trigger = lttng_trigger_create(condition, action); |
245 | if (!trigger) { | |
a58c490f JG |
246 | ret = -1; |
247 | goto error; | |
248 | } | |
c0a66c84 | 249 | |
6808ef55 | 250 | lttng_trigger_set_credentials(trigger, &creds); |
64eafdf6 | 251 | |
7ca172c1 JR |
252 | /* |
253 | * The trigger object owns references to the action and condition | |
254 | * objects. | |
255 | */ | |
256 | lttng_condition_put(condition); | |
257 | condition = NULL; | |
258 | ||
259 | lttng_action_put(action); | |
260 | action = NULL; | |
261 | ||
242388e4 JR |
262 | if (name) { |
263 | const enum lttng_trigger_status status = | |
6808ef55 | 264 | lttng_trigger_set_name(trigger, name); |
242388e4 JR |
265 | |
266 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
267 | ret = -1; | |
268 | goto end; | |
269 | } | |
270 | } | |
271 | ||
47d5bdf0 JG |
272 | if (trigger_comm->is_hidden) { |
273 | lttng_trigger_set_hidden(trigger); | |
274 | } | |
275 | ||
a58c490f | 276 | ret = offset; |
7ca172c1 | 277 | |
a58c490f | 278 | error: |
1065801b JG |
279 | lttng_condition_put(condition); |
280 | lttng_action_put(action); | |
7ca172c1 | 281 | end: |
f5d98ed9 | 282 | if (ret >= 0) { |
6808ef55 JG |
283 | *_trigger = trigger; |
284 | } else { | |
285 | lttng_trigger_put(trigger); | |
286 | } | |
287 | ||
a58c490f JG |
288 | return ret; |
289 | } | |
290 | ||
291 | /* | |
a58c490f JG |
292 | * Both elements are stored contiguously, see their "*_comm" structure |
293 | * for the detailed format. | |
294 | */ | |
295 | LTTNG_HIDDEN | |
a02903c0 | 296 | int lttng_trigger_serialize(const struct lttng_trigger *trigger, |
c0a66c84 | 297 | struct lttng_payload *payload) |
a58c490f | 298 | { |
3647288f | 299 | int ret; |
242388e4 | 300 | size_t header_offset, size_before_payload, size_name; |
c0a66c84 | 301 | struct lttng_trigger_comm trigger_comm = {}; |
3647288f | 302 | struct lttng_trigger_comm *header; |
64eafdf6 JR |
303 | const struct lttng_credentials *creds = NULL; |
304 | ||
305 | creds = lttng_trigger_get_credentials(trigger); | |
306 | assert(creds); | |
307 | ||
308 | trigger_comm.uid = LTTNG_OPTIONAL_GET(creds->uid); | |
a58c490f | 309 | |
242388e4 JR |
310 | if (trigger->name != NULL) { |
311 | size_name = strlen(trigger->name) + 1; | |
312 | } else { | |
313 | size_name = 0; | |
314 | } | |
315 | ||
316 | trigger_comm.name_length = size_name; | |
317 | ||
47d5bdf0 JG |
318 | trigger_comm.is_hidden = lttng_trigger_is_hidden(trigger); |
319 | ||
c0a66c84 JG |
320 | header_offset = payload->buffer.size; |
321 | ret = lttng_dynamic_buffer_append(&payload->buffer, &trigger_comm, | |
3647288f JG |
322 | sizeof(trigger_comm)); |
323 | if (ret) { | |
a58c490f JG |
324 | goto end; |
325 | } | |
326 | ||
c0a66c84 | 327 | size_before_payload = payload->buffer.size; |
242388e4 JR |
328 | |
329 | /* Trigger name. */ | |
330 | ret = lttng_dynamic_buffer_append( | |
331 | &payload->buffer, trigger->name, size_name); | |
332 | if (ret) { | |
333 | goto end; | |
334 | } | |
335 | ||
c0a66c84 | 336 | ret = lttng_condition_serialize(trigger->condition, payload); |
3647288f | 337 | if (ret) { |
a58c490f JG |
338 | goto end; |
339 | } | |
a58c490f | 340 | |
c0a66c84 | 341 | ret = lttng_action_serialize(trigger->action, payload); |
3647288f | 342 | if (ret) { |
a58c490f JG |
343 | goto end; |
344 | } | |
a58c490f | 345 | |
3647288f | 346 | /* Update payload size. */ |
c0a66c84 JG |
347 | header = (typeof(header)) (payload->buffer.data + header_offset); |
348 | header->length = payload->buffer.size - size_before_payload; | |
a58c490f JG |
349 | end: |
350 | return ret; | |
351 | } | |
3da864a9 | 352 | |
85c06c44 JR |
353 | LTTNG_HIDDEN |
354 | bool lttng_trigger_is_equal( | |
355 | const struct lttng_trigger *a, const struct lttng_trigger *b) | |
356 | { | |
0efb2ad7 JG |
357 | if (!!a->name != !!b->name) { |
358 | /* Both must be either anonymous or named. */ | |
359 | return false; | |
360 | } | |
361 | ||
362 | if (a->name && strcmp(a->name, b->name) != 0) { | |
1ca78886 FD |
363 | return false; |
364 | } | |
365 | ||
85c06c44 JR |
366 | if (!lttng_condition_is_equal(a->condition, b->condition)) { |
367 | return false; | |
368 | } | |
369 | ||
370 | if (!lttng_action_is_equal(a->action, b->action)) { | |
371 | return false; | |
372 | } | |
373 | ||
374 | if (!lttng_credentials_is_equal(lttng_trigger_get_credentials(a), | |
375 | lttng_trigger_get_credentials(b))) { | |
376 | return false; | |
377 | } | |
378 | ||
5682b2e6 JG |
379 | if (a->is_hidden != b->is_hidden) { |
380 | return false; | |
381 | } | |
382 | ||
85c06c44 JR |
383 | return true; |
384 | } | |
385 | ||
5682b2e6 JG |
386 | LTTNG_HIDDEN |
387 | bool lttng_trigger_is_hidden(const struct lttng_trigger *trigger) | |
388 | { | |
389 | return trigger->is_hidden; | |
390 | } | |
391 | ||
392 | LTTNG_HIDDEN | |
393 | void lttng_trigger_set_hidden(struct lttng_trigger *trigger) | |
394 | { | |
395 | assert(!trigger->is_hidden); | |
396 | trigger->is_hidden = true; | |
397 | } | |
398 | ||
a5c2d2a7 | 399 | LTTNG_HIDDEN |
242388e4 JR |
400 | enum lttng_trigger_status lttng_trigger_set_name(struct lttng_trigger *trigger, |
401 | const char* name) | |
402 | { | |
403 | char *name_copy = NULL; | |
404 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
405 | ||
a5c2d2a7 | 406 | if (!trigger) { |
242388e4 JR |
407 | status = LTTNG_TRIGGER_STATUS_INVALID; |
408 | goto end; | |
409 | } | |
410 | ||
a5c2d2a7 JG |
411 | if (name) { |
412 | name_copy = strdup(name); | |
413 | if (!name_copy) { | |
414 | status = LTTNG_TRIGGER_STATUS_ERROR; | |
415 | goto end; | |
416 | } | |
242388e4 JR |
417 | } |
418 | ||
419 | free(trigger->name); | |
420 | ||
421 | trigger->name = name_copy; | |
422 | name_copy = NULL; | |
423 | end: | |
424 | return status; | |
425 | } | |
426 | ||
427 | enum lttng_trigger_status lttng_trigger_get_name( | |
428 | const struct lttng_trigger *trigger, const char **name) | |
429 | { | |
430 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
431 | ||
432 | if (!trigger || !name) { | |
433 | status = LTTNG_TRIGGER_STATUS_INVALID; | |
434 | goto end; | |
435 | } | |
436 | ||
437 | if (!trigger->name) { | |
438 | status = LTTNG_TRIGGER_STATUS_UNSET; | |
439 | } | |
440 | ||
441 | *name = trigger->name; | |
442 | end: | |
443 | return status; | |
444 | } | |
445 | ||
446 | LTTNG_HIDDEN | |
447 | int lttng_trigger_assign_name(struct lttng_trigger *dst, | |
448 | const struct lttng_trigger *src) | |
449 | { | |
450 | int ret = 0; | |
451 | enum lttng_trigger_status status; | |
452 | ||
453 | status = lttng_trigger_set_name(dst, src->name); | |
454 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
455 | ret = -1; | |
456 | ERR("Failed to set name for trigger"); | |
457 | goto end; | |
458 | } | |
459 | end: | |
460 | return ret; | |
461 | } | |
462 | ||
e6887944 JR |
463 | LTTNG_HIDDEN |
464 | void lttng_trigger_set_tracer_token(struct lttng_trigger *trigger, | |
465 | uint64_t token) | |
466 | { | |
467 | assert(trigger); | |
468 | LTTNG_OPTIONAL_SET(&trigger->tracer_token, token); | |
469 | } | |
470 | ||
471 | LTTNG_HIDDEN | |
472 | uint64_t lttng_trigger_get_tracer_token(const struct lttng_trigger *trigger) | |
473 | { | |
474 | assert(trigger); | |
475 | ||
476 | return LTTNG_OPTIONAL_GET(trigger->tracer_token); | |
477 | } | |
478 | ||
242388e4 JR |
479 | LTTNG_HIDDEN |
480 | int lttng_trigger_generate_name(struct lttng_trigger *trigger, | |
481 | uint64_t unique_id) | |
482 | { | |
483 | int ret = 0; | |
484 | char *generated_name = NULL; | |
485 | ||
51620a0a | 486 | ret = asprintf(&generated_name, "trigger%" PRIu64 "", unique_id); |
242388e4 JR |
487 | if (ret < 0) { |
488 | ERR("Failed to generate trigger name"); | |
489 | ret = -1; | |
490 | goto end; | |
491 | } | |
492 | ||
493 | ret = 0; | |
494 | free(trigger->name); | |
495 | trigger->name = generated_name; | |
496 | end: | |
497 | return ret; | |
498 | } | |
499 | ||
f01d28b4 JR |
500 | LTTNG_HIDDEN |
501 | void lttng_trigger_get(struct lttng_trigger *trigger) | |
502 | { | |
503 | urcu_ref_get(&trigger->ref); | |
504 | } | |
505 | ||
506 | LTTNG_HIDDEN | |
507 | void lttng_trigger_put(struct lttng_trigger *trigger) | |
508 | { | |
509 | if (!trigger) { | |
510 | return; | |
511 | } | |
512 | ||
513 | urcu_ref_put(&trigger->ref , trigger_destroy_ref); | |
514 | } | |
515 | ||
a02903c0 JR |
516 | static void delete_trigger_array_element(void *ptr) |
517 | { | |
518 | struct lttng_trigger *trigger = ptr; | |
519 | ||
520 | lttng_trigger_put(trigger); | |
521 | } | |
522 | ||
523 | LTTNG_HIDDEN | |
524 | struct lttng_triggers *lttng_triggers_create(void) | |
525 | { | |
526 | struct lttng_triggers *triggers = NULL; | |
527 | ||
528 | triggers = zmalloc(sizeof(*triggers)); | |
529 | if (!triggers) { | |
530 | goto end; | |
531 | } | |
532 | ||
533 | lttng_dynamic_pointer_array_init(&triggers->array, delete_trigger_array_element); | |
534 | ||
535 | end: | |
536 | return triggers; | |
537 | } | |
538 | ||
539 | LTTNG_HIDDEN | |
540 | struct lttng_trigger *lttng_triggers_borrow_mutable_at_index( | |
541 | const struct lttng_triggers *triggers, unsigned int index) | |
542 | { | |
543 | struct lttng_trigger *trigger = NULL; | |
544 | ||
545 | assert(triggers); | |
546 | if (index >= lttng_dynamic_pointer_array_get_count(&triggers->array)) { | |
547 | goto end; | |
548 | } | |
549 | ||
550 | trigger = (struct lttng_trigger *) | |
551 | lttng_dynamic_pointer_array_get_pointer( | |
552 | &triggers->array, index); | |
553 | end: | |
554 | return trigger; | |
555 | } | |
556 | ||
557 | LTTNG_HIDDEN | |
558 | int lttng_triggers_add( | |
559 | struct lttng_triggers *triggers, struct lttng_trigger *trigger) | |
560 | { | |
561 | int ret; | |
562 | ||
563 | assert(triggers); | |
564 | assert(trigger); | |
565 | ||
566 | lttng_trigger_get(trigger); | |
567 | ||
568 | ret = lttng_dynamic_pointer_array_add_pointer(&triggers->array, trigger); | |
569 | if (ret) { | |
570 | lttng_trigger_put(trigger); | |
571 | } | |
572 | ||
573 | return ret; | |
574 | } | |
575 | ||
5682b2e6 JG |
576 | LTTNG_HIDDEN |
577 | int lttng_triggers_remove_hidden_triggers(struct lttng_triggers *triggers) | |
578 | { | |
579 | int ret; | |
580 | unsigned int trigger_count, i = 0; | |
581 | enum lttng_trigger_status trigger_status; | |
582 | ||
583 | assert(triggers); | |
584 | ||
585 | trigger_status = lttng_triggers_get_count(triggers, &trigger_count); | |
586 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); | |
587 | ||
588 | while (i < trigger_count) { | |
589 | const struct lttng_trigger *trigger = | |
590 | lttng_triggers_get_at_index(triggers, i); | |
591 | ||
592 | if (lttng_trigger_is_hidden(trigger)) { | |
593 | ret = lttng_dynamic_pointer_array_remove_pointer( | |
594 | &triggers->array, i); | |
595 | if (ret) { | |
596 | goto end; | |
597 | } | |
598 | ||
599 | trigger_count--; | |
600 | } else { | |
601 | i++; | |
602 | } | |
603 | } | |
604 | ||
605 | ret = 0; | |
606 | end: | |
607 | return ret; | |
608 | } | |
609 | ||
a02903c0 JR |
610 | const struct lttng_trigger *lttng_triggers_get_at_index( |
611 | const struct lttng_triggers *triggers, unsigned int index) | |
612 | { | |
613 | return lttng_triggers_borrow_mutable_at_index(triggers, index); | |
614 | } | |
615 | ||
616 | enum lttng_trigger_status lttng_triggers_get_count(const struct lttng_triggers *triggers, unsigned int *count) | |
617 | { | |
618 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
619 | ||
620 | if (!triggers || !count) { | |
621 | status = LTTNG_TRIGGER_STATUS_INVALID; | |
622 | goto end; | |
623 | } | |
624 | ||
625 | *count = lttng_dynamic_pointer_array_get_count(&triggers->array); | |
626 | end: | |
627 | return status; | |
628 | } | |
629 | ||
630 | void lttng_triggers_destroy(struct lttng_triggers *triggers) | |
631 | { | |
632 | if (!triggers) { | |
633 | return; | |
634 | } | |
635 | ||
636 | lttng_dynamic_pointer_array_reset(&triggers->array); | |
637 | free(triggers); | |
638 | } | |
639 | ||
640 | int lttng_triggers_serialize(const struct lttng_triggers *triggers, | |
641 | struct lttng_payload *payload) | |
642 | { | |
643 | int ret; | |
644 | unsigned int i, count; | |
645 | size_t size_before_payload; | |
646 | struct lttng_triggers_comm triggers_comm = {}; | |
647 | struct lttng_triggers_comm *header; | |
648 | enum lttng_trigger_status status; | |
649 | const size_t header_offset = payload->buffer.size; | |
650 | ||
651 | status = lttng_triggers_get_count(triggers, &count); | |
652 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
653 | ret = LTTNG_ERR_INVALID; | |
654 | goto end; | |
655 | } | |
656 | ||
657 | triggers_comm.count = count; | |
658 | ||
659 | /* Placeholder header; updated at the end. */ | |
660 | ret = lttng_dynamic_buffer_append(&payload->buffer, &triggers_comm, | |
661 | sizeof(triggers_comm)); | |
662 | if (ret) { | |
663 | goto end; | |
664 | } | |
665 | ||
666 | size_before_payload = payload->buffer.size; | |
667 | ||
668 | for (i = 0; i < count; i++) { | |
669 | const struct lttng_trigger *trigger = | |
670 | lttng_triggers_get_at_index(triggers, i); | |
671 | ||
672 | assert(trigger); | |
673 | ||
674 | ret = lttng_trigger_serialize(trigger, payload); | |
675 | if (ret) { | |
676 | goto end; | |
677 | } | |
678 | } | |
679 | ||
680 | /* Update payload size. */ | |
681 | header = (struct lttng_triggers_comm *) ((char *) payload->buffer.data + header_offset); | |
682 | header->length = payload->buffer.size - size_before_payload; | |
683 | end: | |
684 | return ret; | |
685 | } | |
686 | ||
687 | LTTNG_HIDDEN | |
688 | ssize_t lttng_triggers_create_from_payload( | |
689 | struct lttng_payload_view *src_view, | |
690 | struct lttng_triggers **triggers) | |
691 | { | |
692 | ssize_t ret, offset = 0, triggers_size = 0; | |
693 | unsigned int i; | |
694 | const struct lttng_triggers_comm *triggers_comm; | |
695 | struct lttng_triggers *local_triggers = NULL; | |
696 | ||
697 | if (!src_view || !triggers) { | |
698 | ret = -1; | |
699 | goto error; | |
700 | } | |
701 | ||
702 | /* lttng_trigger_comms header */ | |
703 | triggers_comm = (const struct lttng_triggers_comm *) src_view->buffer.data; | |
704 | offset += sizeof(*triggers_comm); | |
705 | ||
706 | local_triggers = lttng_triggers_create(); | |
707 | if (!local_triggers) { | |
708 | ret = -1; | |
709 | goto error; | |
710 | } | |
711 | ||
712 | for (i = 0; i < triggers_comm->count; i++) { | |
713 | struct lttng_trigger *trigger = NULL; | |
714 | struct lttng_payload_view trigger_view = | |
715 | lttng_payload_view_from_view(src_view, offset, -1); | |
716 | ssize_t trigger_size; | |
717 | ||
718 | trigger_size = lttng_trigger_create_from_payload( | |
719 | &trigger_view, &trigger); | |
720 | if (trigger_size < 0) { | |
721 | ret = trigger_size; | |
722 | goto error; | |
723 | } | |
724 | ||
725 | /* Transfer ownership of the trigger to the collection. */ | |
726 | ret = lttng_triggers_add(local_triggers, trigger); | |
727 | lttng_trigger_put(trigger); | |
728 | if (ret < 0) { | |
729 | ret = -1; | |
730 | goto error; | |
731 | } | |
732 | ||
733 | offset += trigger_size; | |
734 | triggers_size += trigger_size; | |
735 | } | |
736 | ||
737 | /* Unexpected size of inner-elements; the buffer is corrupted. */ | |
738 | if ((ssize_t) triggers_comm->length != triggers_size) { | |
739 | ret = -1; | |
740 | goto error; | |
741 | } | |
742 | ||
743 | /* Pass ownership to caller. */ | |
744 | *triggers = local_triggers; | |
745 | local_triggers = NULL; | |
746 | ||
747 | ret = offset; | |
748 | error: | |
749 | ||
750 | lttng_triggers_destroy(local_triggers); | |
751 | return ret; | |
752 | } | |
753 | ||
3da864a9 JR |
754 | LTTNG_HIDDEN |
755 | const struct lttng_credentials *lttng_trigger_get_credentials( | |
756 | const struct lttng_trigger *trigger) | |
757 | { | |
64eafdf6 | 758 | return &trigger->creds; |
3da864a9 JR |
759 | } |
760 | ||
761 | LTTNG_HIDDEN | |
64eafdf6 | 762 | void lttng_trigger_set_credentials(struct lttng_trigger *trigger, |
3da864a9 JR |
763 | const struct lttng_credentials *creds) |
764 | { | |
47d5bdf0 | 765 | /* Triggers do not use the group id to authenticate the user. */ |
3da864a9 | 766 | assert(creds); |
47d5bdf0 JG |
767 | LTTNG_OPTIONAL_SET(&trigger->creds.uid, LTTNG_OPTIONAL_GET(creds->uid)); |
768 | LTTNG_OPTIONAL_UNSET(&trigger->creds.gid); | |
64eafdf6 JR |
769 | } |
770 | ||
771 | enum lttng_trigger_status lttng_trigger_set_owner_uid( | |
772 | struct lttng_trigger *trigger, uid_t uid) | |
773 | { | |
774 | enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK; | |
d84c8ae3 | 775 | const uid_t euid = geteuid(); |
64eafdf6 JR |
776 | const struct lttng_credentials creds = { |
777 | .uid = LTTNG_OPTIONAL_INIT_VALUE(uid), | |
778 | .gid = LTTNG_OPTIONAL_INIT_UNSET, | |
779 | }; | |
780 | ||
781 | if (!trigger) { | |
782 | ret = LTTNG_TRIGGER_STATUS_INVALID; | |
783 | goto end; | |
784 | } | |
785 | ||
786 | /* Client-side validation only to report a clearer error. */ | |
d84c8ae3 | 787 | if (euid != 0 && euid != uid) { |
64eafdf6 JR |
788 | ret = LTTNG_TRIGGER_STATUS_PERMISSION_DENIED; |
789 | goto end; | |
790 | } | |
791 | ||
792 | lttng_trigger_set_credentials(trigger, &creds); | |
793 | ||
794 | end: | |
795 | return ret; | |
796 | } | |
797 | ||
798 | enum lttng_trigger_status lttng_trigger_get_owner_uid( | |
799 | const struct lttng_trigger *trigger, uid_t *uid) | |
800 | { | |
801 | enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK; | |
802 | const struct lttng_credentials *creds = NULL; | |
803 | ||
804 | if (!trigger || !uid ) { | |
805 | ret = LTTNG_TRIGGER_STATUS_INVALID; | |
806 | goto end; | |
807 | } | |
808 | ||
809 | if (!trigger->creds.uid.is_set ) { | |
810 | ret = LTTNG_TRIGGER_STATUS_UNSET; | |
811 | goto end; | |
812 | } | |
813 | ||
814 | creds = lttng_trigger_get_credentials(trigger); | |
815 | *uid = lttng_credentials_get_uid(creds); | |
816 | ||
817 | end: | |
818 | return ret; | |
3da864a9 | 819 | } |
5c504c41 | 820 | |
91c96f62 JR |
821 | LTTNG_HIDDEN |
822 | enum lttng_domain_type lttng_trigger_get_underlying_domain_type_restriction( | |
823 | const struct lttng_trigger *trigger) | |
824 | { | |
825 | enum lttng_domain_type type = LTTNG_DOMAIN_NONE; | |
826 | const struct lttng_event_rule *event_rule; | |
827 | enum lttng_condition_status c_status; | |
828 | enum lttng_condition_type c_type; | |
829 | ||
830 | assert(trigger); | |
831 | assert(trigger->condition); | |
832 | ||
833 | c_type = lttng_condition_get_type(trigger->condition); | |
834 | assert (c_type != LTTNG_CONDITION_TYPE_UNKNOWN); | |
835 | ||
836 | switch (c_type) { | |
837 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
838 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
839 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
840 | /* Apply to any domain. */ | |
841 | type = LTTNG_DOMAIN_NONE; | |
842 | break; | |
8dbb86b8 | 843 | case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: |
91c96f62 | 844 | /* Return the domain of the event rule. */ |
8dbb86b8 | 845 | c_status = lttng_condition_event_rule_matches_get_rule( |
91c96f62 JR |
846 | trigger->condition, &event_rule); |
847 | assert(c_status == LTTNG_CONDITION_STATUS_OK); | |
848 | type = lttng_event_rule_get_domain_type(event_rule); | |
849 | break; | |
850 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
851 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
852 | /* Return the domain of the channel being monitored. */ | |
853 | c_status = lttng_condition_buffer_usage_get_domain_type( | |
854 | trigger->condition, &type); | |
855 | assert(c_status == LTTNG_CONDITION_STATUS_OK); | |
856 | break; | |
857 | default: | |
858 | abort(); | |
859 | } | |
860 | ||
861 | return type; | |
862 | } | |
58daac01 JR |
863 | |
864 | /* | |
865 | * Generate bytecode related to the trigger. | |
866 | * On success LTTNG_OK. On error, returns lttng_error code. | |
867 | */ | |
868 | LTTNG_HIDDEN | |
869 | enum lttng_error_code lttng_trigger_generate_bytecode( | |
870 | struct lttng_trigger *trigger, | |
871 | const struct lttng_credentials *creds) | |
872 | { | |
873 | enum lttng_error_code ret; | |
874 | struct lttng_condition *condition = NULL; | |
875 | ||
876 | condition = lttng_trigger_get_condition(trigger); | |
877 | if (!condition) { | |
878 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
879 | goto end; | |
880 | } | |
881 | ||
882 | switch (lttng_condition_get_type(condition)) { | |
8dbb86b8 | 883 | case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: |
58daac01 JR |
884 | { |
885 | struct lttng_event_rule *event_rule; | |
886 | const enum lttng_condition_status condition_status = | |
8dbb86b8 JR |
887 | lttng_condition_event_rule_matches_borrow_rule_mutable( |
888 | condition, &event_rule); | |
58daac01 JR |
889 | |
890 | assert(condition_status == LTTNG_CONDITION_STATUS_OK); | |
f2e97f59 JR |
891 | |
892 | /* Generate the filter bytecode. */ | |
58daac01 JR |
893 | ret = lttng_event_rule_generate_filter_bytecode( |
894 | event_rule, creds); | |
895 | if (ret != LTTNG_OK) { | |
896 | goto end; | |
897 | } | |
898 | ||
f2e97f59 | 899 | /* Generate the capture bytecode. */ |
8dbb86b8 | 900 | ret = lttng_condition_event_rule_matches_generate_capture_descriptor_bytecode( |
f2e97f59 JR |
901 | condition); |
902 | if (ret != LTTNG_OK) { | |
903 | goto end; | |
904 | } | |
905 | ||
58daac01 JR |
906 | ret = LTTNG_OK; |
907 | break; | |
908 | } | |
909 | default: | |
910 | ret = LTTNG_OK; | |
911 | break; | |
912 | } | |
913 | end: | |
914 | return ret; | |
915 | } | |
b61776fb SM |
916 | |
917 | LTTNG_HIDDEN | |
918 | struct lttng_trigger *lttng_trigger_copy(const struct lttng_trigger *trigger) | |
919 | { | |
920 | int ret; | |
921 | struct lttng_payload copy_buffer; | |
94dbd8e4 JG |
922 | struct lttng_condition *condition_copy = NULL; |
923 | struct lttng_action *action_copy = NULL; | |
b61776fb | 924 | struct lttng_trigger *copy = NULL; |
94dbd8e4 JG |
925 | enum lttng_trigger_status trigger_status; |
926 | const char *trigger_name; | |
927 | uid_t trigger_owner_uid; | |
b61776fb SM |
928 | |
929 | lttng_payload_init(©_buffer); | |
930 | ||
94dbd8e4 | 931 | ret = lttng_condition_serialize(trigger->condition, ©_buffer); |
b61776fb SM |
932 | if (ret < 0) { |
933 | goto end; | |
934 | } | |
935 | ||
936 | { | |
937 | struct lttng_payload_view view = | |
938 | lttng_payload_view_from_payload( | |
939 | ©_buffer, 0, -1); | |
94dbd8e4 JG |
940 | |
941 | ret = lttng_condition_create_from_payload( | |
942 | &view, &condition_copy); | |
943 | if (ret < 0) { | |
944 | goto end; | |
945 | } | |
946 | } | |
947 | ||
948 | lttng_payload_clear(©_buffer); | |
949 | ||
950 | ret = lttng_action_serialize(trigger->action, ©_buffer); | |
951 | if (ret < 0) { | |
952 | goto end; | |
953 | } | |
954 | ||
955 | { | |
956 | struct lttng_payload_view view = | |
957 | lttng_payload_view_from_payload( | |
958 | ©_buffer, 0, -1); | |
959 | ||
960 | ret = lttng_action_create_from_payload( | |
961 | &view, &action_copy); | |
b61776fb | 962 | if (ret < 0) { |
b61776fb SM |
963 | goto end; |
964 | } | |
965 | } | |
966 | ||
94dbd8e4 JG |
967 | copy = lttng_trigger_create(condition_copy, action_copy); |
968 | if (!copy) { | |
969 | ERR("Failed to allocate trigger during trigger copy"); | |
970 | goto end; | |
971 | } | |
972 | ||
973 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); | |
974 | switch (trigger_status) { | |
975 | case LTTNG_TRIGGER_STATUS_OK: | |
976 | trigger_status = lttng_trigger_set_name(copy, trigger_name); | |
977 | if (trigger_status != LTTNG_TRIGGER_STATUS_OK) { | |
978 | ERR("Failed to set name of new trigger during copy"); | |
979 | goto error_cleanup_trigger; | |
980 | } | |
981 | break; | |
982 | case LTTNG_TRIGGER_STATUS_UNSET: | |
983 | break; | |
984 | default: | |
985 | ERR("Failed to get name of original trigger during copy"); | |
986 | goto error_cleanup_trigger; | |
987 | } | |
988 | ||
989 | trigger_status = lttng_trigger_get_owner_uid( | |
990 | trigger, &trigger_owner_uid); | |
991 | switch (trigger_status) { | |
992 | case LTTNG_TRIGGER_STATUS_OK: | |
993 | LTTNG_OPTIONAL_SET(©->creds.uid, trigger_owner_uid); | |
994 | break; | |
995 | case LTTNG_TRIGGER_STATUS_UNSET: | |
996 | break; | |
997 | default: | |
998 | ERR("Failed to get owner uid of original trigger during copy"); | |
999 | goto error_cleanup_trigger; | |
1000 | } | |
1001 | ||
1002 | copy->tracer_token = trigger->tracer_token; | |
1003 | copy->registered = trigger->registered; | |
5682b2e6 | 1004 | copy->is_hidden = trigger->is_hidden; |
94dbd8e4 JG |
1005 | goto end; |
1006 | ||
1007 | error_cleanup_trigger: | |
1008 | lttng_trigger_destroy(copy); | |
1009 | copy = NULL; | |
b61776fb | 1010 | end: |
94dbd8e4 JG |
1011 | lttng_condition_put(condition_copy); |
1012 | lttng_action_put(action_copy); | |
b61776fb SM |
1013 | lttng_payload_reset(©_buffer); |
1014 | return copy; | |
1015 | } | |
c738df17 FD |
1016 | |
1017 | LTTNG_HIDDEN | |
1018 | bool lttng_trigger_needs_tracer_notifier(const struct lttng_trigger *trigger) | |
1019 | { | |
1020 | bool needs_tracer_notifier = false; | |
1021 | const struct lttng_condition *condition = | |
1022 | lttng_trigger_get_const_condition(trigger); | |
1023 | ||
1024 | switch (lttng_condition_get_type(condition)) { | |
8dbb86b8 | 1025 | case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: |
c738df17 FD |
1026 | needs_tracer_notifier = true; |
1027 | goto end; | |
1028 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
1029 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
1030 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
1031 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
1032 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
1033 | goto end; | |
1034 | case LTTNG_CONDITION_TYPE_UNKNOWN: | |
1035 | default: | |
1036 | abort(); | |
1037 | } | |
1038 | end: | |
1039 | return needs_tracer_notifier; | |
1040 | } | |
9c374932 JR |
1041 | |
1042 | LTTNG_HIDDEN | |
1043 | void lttng_trigger_set_as_registered(struct lttng_trigger *trigger) | |
1044 | { | |
1045 | pthread_mutex_lock(&trigger->lock); | |
1046 | trigger->registered = true; | |
1047 | pthread_mutex_unlock(&trigger->lock); | |
1048 | } | |
1049 | ||
1050 | LTTNG_HIDDEN | |
1051 | void lttng_trigger_set_as_unregistered(struct lttng_trigger *trigger) | |
1052 | { | |
1053 | pthread_mutex_lock(&trigger->lock); | |
1054 | trigger->registered = false; | |
1055 | pthread_mutex_unlock(&trigger->lock); | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * The trigger must be locked before calling lttng_trigger_registered. | |
1060 | * The lock is necessary since a trigger can be unregistered at anytime. | |
1061 | * Manipulations requiring that the trigger be registered must always acquire | |
1062 | * the trigger lock for the duration of the manipulation using | |
1063 | * `lttng_trigger_lock` and `lttng_trigger_unlock`. | |
1064 | */ | |
1065 | LTTNG_HIDDEN | |
1066 | bool lttng_trigger_is_registered(struct lttng_trigger *trigger) | |
1067 | { | |
1068 | ASSERT_LOCKED(trigger->lock); | |
1069 | return trigger->registered; | |
1070 | } | |
1071 | ||
1072 | LTTNG_HIDDEN | |
1073 | void lttng_trigger_lock(struct lttng_trigger *trigger) | |
1074 | { | |
1075 | pthread_mutex_lock(&trigger->lock); | |
1076 | } | |
1077 | ||
1078 | LTTNG_HIDDEN | |
1079 | void lttng_trigger_unlock(struct lttng_trigger *trigger) | |
1080 | { | |
1081 | pthread_mutex_unlock(&trigger->lock); | |
1082 | } | |
0f7c2963 JR |
1083 | |
1084 | LTTNG_HIDDEN | |
1085 | enum lttng_error_code lttng_trigger_mi_serialize(const struct lttng_trigger *trigger, | |
1086 | struct mi_writer *writer, | |
1087 | const struct mi_lttng_error_query_callbacks | |
1088 | *error_query_callbacks) | |
1089 | { | |
1090 | int ret; | |
1091 | enum lttng_error_code ret_code; | |
1092 | enum lttng_trigger_status trigger_status; | |
1093 | const struct lttng_condition *condition = NULL; | |
1094 | const struct lttng_action *action = NULL; | |
1095 | struct lttng_dynamic_array action_path_indexes; | |
1096 | uid_t owner_uid; | |
1097 | ||
1098 | assert(trigger); | |
1099 | assert(writer); | |
1100 | ||
1101 | lttng_dynamic_array_init(&action_path_indexes, sizeof(uint64_t), NULL); | |
1102 | ||
1103 | /* Open trigger element. */ | |
1104 | ret = mi_lttng_writer_open_element(writer, mi_lttng_element_trigger); | |
1105 | if (ret) { | |
1106 | goto mi_error; | |
1107 | } | |
1108 | ||
1109 | trigger_status = lttng_trigger_get_owner_uid(trigger, &owner_uid); | |
1110 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); | |
1111 | ||
1112 | /* Name. */ | |
1113 | ret = mi_lttng_writer_write_element_string( | |
1114 | writer, config_element_name, trigger->name); | |
1115 | if (ret) { | |
1116 | goto mi_error; | |
1117 | } | |
1118 | ||
1119 | /* Owner uid. */ | |
1120 | ret = mi_lttng_writer_write_element_signed_int(writer, | |
1121 | mi_lttng_element_trigger_owner_uid, | |
1122 | (int64_t) owner_uid); | |
1123 | if (ret) { | |
1124 | goto mi_error; | |
1125 | } | |
1126 | ||
1127 | /* Condition. */ | |
1128 | condition = lttng_trigger_get_const_condition(trigger); | |
1129 | assert(condition); | |
1130 | ret_code = lttng_condition_mi_serialize( | |
1131 | trigger, condition, writer, error_query_callbacks); | |
1132 | if (ret_code != LTTNG_OK) { | |
1133 | goto end; | |
1134 | } | |
1135 | ||
1136 | /* Action. */ | |
1137 | action = lttng_trigger_get_const_action(trigger); | |
1138 | assert(action); | |
1139 | ret_code = lttng_action_mi_serialize(trigger, action, writer, | |
1140 | error_query_callbacks, &action_path_indexes); | |
1141 | if (ret_code != LTTNG_OK) { | |
1142 | goto end; | |
1143 | } | |
1144 | ||
1145 | if (error_query_callbacks && error_query_callbacks->trigger_cb) { | |
1146 | struct lttng_error_query_results *results = NULL; | |
1147 | ||
1148 | ret_code = error_query_callbacks->trigger_cb(trigger, &results); | |
1149 | if (ret_code != LTTNG_OK) { | |
1150 | goto end; | |
1151 | } | |
1152 | ||
1153 | ret_code = lttng_error_query_results_mi_serialize( | |
1154 | results, writer); | |
1155 | lttng_error_query_results_destroy(results); | |
1156 | if (ret_code != LTTNG_OK) { | |
1157 | goto end; | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | /* Close trigger element. */ | |
1162 | ret = mi_lttng_writer_close_element(writer); | |
1163 | if (ret) { | |
1164 | goto mi_error; | |
1165 | } | |
1166 | ||
1167 | ret_code = LTTNG_OK; | |
1168 | goto end; | |
1169 | ||
1170 | mi_error: | |
1171 | ret_code = LTTNG_ERR_MI_IO_FAIL; | |
1172 | end: | |
1173 | lttng_dynamic_array_reset(&action_path_indexes); | |
1174 | return ret_code; | |
1175 | } | |
1176 | ||
1177 | /* Used by qsort, which expects the semantics of strcmp(). */ | |
1178 | static int compare_triggers_by_name(const void *a, const void *b) | |
1179 | { | |
1180 | const struct lttng_trigger *trigger_a = | |
1181 | *((const struct lttng_trigger **) a); | |
1182 | const struct lttng_trigger *trigger_b = | |
1183 | *((const struct lttng_trigger **) b); | |
1184 | const char *name_a, *name_b; | |
1185 | enum lttng_trigger_status trigger_status; | |
1186 | ||
1187 | /* Anonymous triggers are not reachable here. */ | |
1188 | trigger_status = lttng_trigger_get_name(trigger_a, &name_a); | |
1189 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); | |
1190 | ||
1191 | trigger_status = lttng_trigger_get_name(trigger_b, &name_b); | |
1192 | assert(trigger_status == LTTNG_TRIGGER_STATUS_OK); | |
1193 | ||
1194 | return strcmp(name_a, name_b); | |
1195 | } | |
1196 | ||
1197 | LTTNG_HIDDEN | |
1198 | enum lttng_error_code lttng_triggers_mi_serialize(const struct lttng_triggers *triggers, | |
1199 | struct mi_writer *writer, | |
1200 | const struct mi_lttng_error_query_callbacks | |
1201 | *error_query_callbacks) | |
1202 | { | |
1203 | int ret; | |
1204 | enum lttng_error_code ret_code; | |
1205 | enum lttng_trigger_status status; | |
1206 | unsigned int count, i; | |
1207 | struct lttng_dynamic_pointer_array sorted_triggers; | |
1208 | ||
1209 | assert(triggers); | |
1210 | assert(writer); | |
1211 | ||
1212 | /* | |
1213 | * Sort trigger by name to ensure an order at the MI level and ignore | |
1214 | * any anonymous trigger present. | |
1215 | */ | |
1216 | lttng_dynamic_pointer_array_init(&sorted_triggers, NULL); | |
1217 | ||
1218 | status = lttng_triggers_get_count(triggers, &count); | |
1219 | assert(status == LTTNG_TRIGGER_STATUS_OK); | |
1220 | ||
1221 | for (i = 0; i < count; i++) { | |
1222 | int add_ret; | |
1223 | const char *unused_name; | |
1224 | const struct lttng_trigger *trigger = | |
1225 | lttng_triggers_get_at_index(triggers, i); | |
1226 | ||
1227 | status = lttng_trigger_get_name(trigger, &unused_name); | |
1228 | switch (status) { | |
1229 | case LTTNG_TRIGGER_STATUS_OK: | |
1230 | break; | |
1231 | case LTTNG_TRIGGER_STATUS_UNSET: | |
1232 | /* Don't list anonymous triggers. */ | |
1233 | continue; | |
1234 | default: | |
1235 | abort(); | |
1236 | } | |
1237 | ||
1238 | add_ret = lttng_dynamic_pointer_array_add_pointer( | |
1239 | &sorted_triggers, (void *) trigger); | |
1240 | ||
1241 | if (add_ret) { | |
1242 | ERR("Failed to lttng_trigger to sorting array."); | |
1243 | ret_code = LTTNG_ERR_NOMEM; | |
1244 | goto error; | |
1245 | } | |
1246 | } | |
1247 | ||
1248 | qsort(sorted_triggers.array.buffer.data, count, | |
1249 | sizeof(struct lttng_trigger *), | |
1250 | compare_triggers_by_name); | |
1251 | ||
1252 | /* Open triggers element. */ | |
1253 | ret = mi_lttng_writer_open_element(writer, mi_lttng_element_triggers); | |
1254 | if (ret) { | |
1255 | ret_code = LTTNG_ERR_MI_IO_FAIL; | |
1256 | goto error; | |
1257 | } | |
1258 | ||
1259 | for (i = 0; i < lttng_dynamic_pointer_array_get_count(&sorted_triggers); i++) { | |
1260 | const struct lttng_trigger *trigger = | |
1261 | (const struct lttng_trigger *) | |
1262 | lttng_dynamic_pointer_array_get_pointer( | |
1263 | &sorted_triggers, i); | |
1264 | ||
1265 | lttng_trigger_mi_serialize(trigger, writer, error_query_callbacks); | |
1266 | } | |
1267 | ||
1268 | /* Close triggers element. */ | |
1269 | ret = mi_lttng_writer_close_element(writer); | |
1270 | if (ret) { | |
1271 | ret_code = LTTNG_ERR_MI_IO_FAIL; | |
1272 | goto error; | |
1273 | } | |
1274 | ||
1275 | ret_code = LTTNG_OK; | |
1276 | ||
1277 | error: | |
1278 | lttng_dynamic_pointer_array_reset(&sorted_triggers); | |
1279 | return ret_code; | |
1280 | } |