Commit | Line | Data |
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757c48a2 SM |
1 | /* |
2 | * Copyright (C) 2019 Simon Marchi <simon.marchi@efficios.com> | |
3 | * | |
4 | * SPDX-License-Identifier: LGPL-2.1-only | |
5 | * | |
6 | */ | |
7 | ||
8 | #include <assert.h> | |
9 | #include <common/error.h> | |
10 | #include <common/macros.h> | |
9e620ea7 | 11 | #include <common/payload-view.h> |
d35c7a38 JR |
12 | #include <common/payload.h> |
13 | #include <common/snapshot.h> | |
14 | #include <inttypes.h> | |
757c48a2 | 15 | #include <lttng/action/action-internal.h> |
7f4d5b07 JR |
16 | #include <lttng/action/rate-policy-internal.h> |
17 | #include <lttng/action/rate-policy.h> | |
757c48a2 SM |
18 | #include <lttng/action/snapshot-session-internal.h> |
19 | #include <lttng/action/snapshot-session.h> | |
757c48a2 | 20 | #include <lttng/snapshot-internal.h> |
d35c7a38 | 21 | #include <lttng/snapshot.h> |
757c48a2 SM |
22 | |
23 | #define IS_SNAPSHOT_SESSION_ACTION(action) \ | |
17182cfd | 24 | (lttng_action_get_type(action) == LTTNG_ACTION_TYPE_SNAPSHOT_SESSION) |
757c48a2 SM |
25 | |
26 | struct lttng_action_snapshot_session { | |
27 | struct lttng_action parent; | |
28 | ||
29 | /* Owned by this. */ | |
30 | char *session_name; | |
31 | ||
32 | /* | |
33 | * When non-NULL, use this custom output when taking the snapshot, | |
34 | * rather than the session's registered snapshot output. | |
35 | * | |
36 | * Owned by this. | |
37 | */ | |
38 | struct lttng_snapshot_output *output; | |
7f4d5b07 | 39 | struct lttng_rate_policy *policy; |
757c48a2 SM |
40 | }; |
41 | ||
42 | struct lttng_action_snapshot_session_comm { | |
43 | /* All string lengths include the trailing \0. */ | |
44 | uint32_t session_name_len; | |
45 | uint32_t snapshot_output_len; | |
7f4d5b07 | 46 | uint32_t rate_policy_len; |
757c48a2 SM |
47 | |
48 | /* | |
49 | * Variable data (all strings are null-terminated): | |
50 | * | |
51 | * - session name string | |
52 | * - snapshot output object | |
d35c7a38 | 53 | * - policy object |
757c48a2 SM |
54 | */ |
55 | char data[]; | |
56 | } LTTNG_PACKED; | |
57 | ||
7f4d5b07 JR |
58 | static const struct lttng_rate_policy * |
59 | lttng_action_snapshot_session_internal_get_rate_policy( | |
2d57482c JR |
60 | const struct lttng_action *action); |
61 | ||
757c48a2 SM |
62 | static struct lttng_action_snapshot_session * |
63 | action_snapshot_session_from_action(struct lttng_action *action) | |
64 | { | |
65 | assert(action); | |
66 | ||
67 | return container_of( | |
68 | action, struct lttng_action_snapshot_session, parent); | |
69 | } | |
70 | ||
71 | static const struct lttng_action_snapshot_session * | |
72 | action_snapshot_session_from_action_const(const struct lttng_action *action) | |
73 | { | |
74 | assert(action); | |
75 | ||
76 | return container_of( | |
77 | action, struct lttng_action_snapshot_session, parent); | |
78 | } | |
79 | ||
80 | static bool lttng_action_snapshot_session_validate(struct lttng_action *action) | |
81 | { | |
82 | bool valid = false; | |
83 | struct lttng_action_snapshot_session *action_snapshot_session; | |
84 | ||
85 | if (!action) { | |
86 | goto end; | |
87 | } | |
88 | ||
89 | action_snapshot_session = action_snapshot_session_from_action(action); | |
90 | ||
91 | /* A non-empty session name is mandatory. */ | |
92 | if (!action_snapshot_session->session_name || | |
93 | strlen(action_snapshot_session->session_name) == 0) { | |
94 | goto end; | |
95 | } | |
96 | ||
97 | if (action_snapshot_session->output && | |
98 | !lttng_snapshot_output_validate(action_snapshot_session->output)) { | |
99 | goto end; | |
100 | } | |
101 | ||
102 | valid = true; | |
103 | end: | |
104 | return valid; | |
105 | } | |
106 | ||
107 | static bool lttng_action_snapshot_session_is_equal( | |
108 | const struct lttng_action *_a, const struct lttng_action *_b) | |
109 | { | |
110 | bool is_equal = false; | |
111 | const struct lttng_action_snapshot_session *a, *b; | |
112 | ||
113 | a = action_snapshot_session_from_action_const(_a); | |
114 | b = action_snapshot_session_from_action_const(_b); | |
115 | ||
116 | /* Action is not valid if this is not true. */ | |
117 | assert(a->session_name); | |
118 | assert(b->session_name); | |
119 | if (strcmp(a->session_name, b->session_name)) { | |
120 | goto end; | |
121 | } | |
122 | ||
123 | if (a->output && b->output && | |
124 | !lttng_snapshot_output_is_equal(a->output, b->output)) { | |
125 | goto end; | |
126 | } else if (!!a->output != !!b->output) { | |
127 | goto end; | |
128 | } | |
129 | ||
7f4d5b07 | 130 | is_equal = lttng_rate_policy_is_equal(a->policy, b->policy); |
757c48a2 SM |
131 | end: |
132 | return is_equal; | |
133 | } | |
134 | ||
0c51e8f3 | 135 | static size_t serialize_strlen(const char *str) |
757c48a2 | 136 | { |
0c51e8f3 | 137 | return str ? strlen(str) + 1 : 0; |
757c48a2 SM |
138 | } |
139 | ||
140 | static int lttng_action_snapshot_session_serialize( | |
141 | struct lttng_action *action, struct lttng_payload *payload) | |
142 | { | |
143 | struct lttng_action_snapshot_session *action_snapshot_session; | |
144 | struct lttng_action_snapshot_session_comm comm = {}; | |
145 | int ret; | |
146 | size_t size_before_comm; | |
147 | ||
148 | assert(action); | |
149 | assert(payload); | |
150 | ||
151 | size_before_comm = payload->buffer.size; | |
757c48a2 SM |
152 | |
153 | action_snapshot_session = action_snapshot_session_from_action(action); | |
154 | comm.session_name_len = | |
155 | serialize_strlen(action_snapshot_session->session_name); | |
156 | ||
157 | /* Add header. */ | |
158 | ret = lttng_dynamic_buffer_append( | |
159 | &payload->buffer, &comm, sizeof(comm)); | |
160 | if (ret) { | |
161 | goto end; | |
162 | } | |
163 | ||
164 | assert(action_snapshot_session->session_name); | |
165 | DBG("Serializing snapshot session action: session-name: %s", | |
166 | action_snapshot_session->session_name); | |
167 | ||
168 | /* Add session name. */ | |
169 | ret = lttng_dynamic_buffer_append(&payload->buffer, | |
170 | action_snapshot_session->session_name, | |
171 | comm.session_name_len); | |
172 | if (ret) { | |
173 | goto end; | |
174 | } | |
175 | ||
176 | /* Serialize the snapshot output object, if any. */ | |
177 | if (action_snapshot_session->output) { | |
178 | const size_t size_before_output = payload->buffer.size; | |
179 | struct lttng_action_snapshot_session_comm *comm_in_payload; | |
180 | ||
181 | ret = lttng_snapshot_output_serialize( | |
182 | action_snapshot_session->output, | |
183 | payload); | |
184 | if (ret) { | |
185 | goto end; | |
186 | } | |
187 | ||
757c48a2 SM |
188 | comm_in_payload = (typeof(comm_in_payload))( |
189 | payload->buffer.data + size_before_comm); | |
d35c7a38 | 190 | /* Adjust action length in header. */ |
757c48a2 SM |
191 | comm_in_payload->snapshot_output_len = |
192 | payload->buffer.size - size_before_output; | |
193 | } | |
194 | ||
7f4d5b07 | 195 | /* Serialize the rate policy. */ |
d35c7a38 JR |
196 | { |
197 | const size_t size_before_output = payload->buffer.size; | |
198 | struct lttng_action_snapshot_session_comm *comm_in_payload; | |
199 | ||
7f4d5b07 | 200 | ret = lttng_rate_policy_serialize( |
d35c7a38 JR |
201 | action_snapshot_session->policy, payload); |
202 | if (ret) { | |
203 | ret = -1; | |
204 | goto end; | |
205 | } | |
206 | ||
207 | comm_in_payload = (typeof(comm_in_payload))( | |
208 | payload->buffer.data + size_before_comm); | |
7f4d5b07 JR |
209 | /* Adjust rate policy length in header. */ |
210 | comm_in_payload->rate_policy_len = | |
d35c7a38 JR |
211 | payload->buffer.size - size_before_output; |
212 | } | |
213 | ||
757c48a2 SM |
214 | end: |
215 | return ret; | |
216 | } | |
217 | ||
218 | static void lttng_action_snapshot_session_destroy(struct lttng_action *action) | |
219 | { | |
220 | struct lttng_action_snapshot_session *action_snapshot_session; | |
221 | ||
222 | if (!action) { | |
223 | goto end; | |
224 | } | |
225 | ||
226 | action_snapshot_session = action_snapshot_session_from_action(action); | |
227 | ||
228 | free(action_snapshot_session->session_name); | |
229 | lttng_snapshot_output_destroy(action_snapshot_session->output); | |
7f4d5b07 | 230 | lttng_rate_policy_destroy(action_snapshot_session->policy); |
757c48a2 SM |
231 | free(action_snapshot_session); |
232 | ||
233 | end: | |
234 | return; | |
235 | } | |
236 | ||
237 | ssize_t lttng_action_snapshot_session_create_from_payload( | |
238 | struct lttng_payload_view *view, | |
239 | struct lttng_action **p_action) | |
240 | { | |
241 | ssize_t consumed_len; | |
757c48a2 SM |
242 | const char *variable_data; |
243 | struct lttng_action *action; | |
244 | enum lttng_action_status status; | |
245 | struct lttng_snapshot_output *snapshot_output = NULL; | |
7f4d5b07 | 246 | struct lttng_rate_policy *policy = NULL; |
3e6e0df2 JG |
247 | const struct lttng_action_snapshot_session_comm *comm; |
248 | const struct lttng_payload_view snapshot_session_comm_view = | |
249 | lttng_payload_view_from_view( | |
250 | view, 0, sizeof(*comm)); | |
757c48a2 SM |
251 | |
252 | action = lttng_action_snapshot_session_create(); | |
253 | if (!action) { | |
254 | goto error; | |
255 | } | |
256 | ||
3e6e0df2 JG |
257 | if (!lttng_payload_view_is_valid(&snapshot_session_comm_view)) { |
258 | /* Payload not large enough to contain the header. */ | |
259 | goto error; | |
260 | } | |
261 | ||
262 | comm = (typeof(comm)) snapshot_session_comm_view.buffer.data; | |
757c48a2 SM |
263 | variable_data = (const char *) &comm->data; |
264 | ||
265 | consumed_len = sizeof(struct lttng_action_snapshot_session_comm); | |
266 | ||
267 | if (!lttng_buffer_view_contains_string( | |
268 | &view->buffer, variable_data, comm->session_name_len)) { | |
269 | goto error; | |
270 | } | |
271 | ||
272 | status = lttng_action_snapshot_session_set_session_name( | |
273 | action, variable_data); | |
274 | if (status != LTTNG_ACTION_STATUS_OK) { | |
275 | goto error; | |
276 | } | |
277 | ||
278 | variable_data += comm->session_name_len; | |
279 | consumed_len += comm->session_name_len; | |
280 | ||
281 | /* If there is a snapshot output object, deserialize it. */ | |
282 | if (comm->snapshot_output_len > 0) { | |
283 | ssize_t snapshot_output_consumed_len; | |
284 | enum lttng_action_status action_status; | |
285 | struct lttng_payload_view snapshot_output_buffer_view = | |
286 | lttng_payload_view_from_view(view, consumed_len, | |
287 | comm->snapshot_output_len); | |
288 | ||
3e6e0df2 | 289 | if (!lttng_payload_view_is_valid(&snapshot_output_buffer_view)) { |
0c51e8f3 | 290 | ERR("Failed to create buffer view for snapshot output."); |
757c48a2 SM |
291 | goto error; |
292 | } | |
293 | ||
294 | snapshot_output_consumed_len = | |
295 | lttng_snapshot_output_create_from_payload( | |
296 | &snapshot_output_buffer_view, | |
297 | &snapshot_output); | |
298 | if (snapshot_output_consumed_len != comm->snapshot_output_len) { | |
0c51e8f3 | 299 | ERR("Failed to deserialize snapshot output object: " |
757c48a2 SM |
300 | "consumed-len: %zd, expected-len: %" PRIu32, |
301 | snapshot_output_consumed_len, | |
302 | comm->snapshot_output_len); | |
303 | goto error; | |
304 | } | |
305 | ||
306 | action_status = lttng_action_snapshot_session_set_output( | |
307 | action, snapshot_output); | |
308 | if (action_status != LTTNG_ACTION_STATUS_OK) { | |
309 | goto error; | |
310 | } | |
311 | ||
312 | /* Ownership has been transferred to the action. */ | |
313 | snapshot_output = NULL; | |
314 | } | |
315 | ||
316 | variable_data += comm->snapshot_output_len; | |
317 | consumed_len += comm->snapshot_output_len; | |
d35c7a38 | 318 | |
7f4d5b07 JR |
319 | /* Rate policy. */ |
320 | if (comm->rate_policy_len <= 0) { | |
321 | ERR("Rate policy should be present."); | |
d35c7a38 JR |
322 | goto error; |
323 | } | |
324 | { | |
7f4d5b07 | 325 | ssize_t rate_policy_consumed_len; |
d35c7a38 JR |
326 | struct lttng_payload_view policy_view = |
327 | lttng_payload_view_from_view(view, consumed_len, | |
7f4d5b07 | 328 | comm->rate_policy_len); |
d35c7a38 JR |
329 | |
330 | if (!lttng_payload_view_is_valid(&policy_view)) { | |
7f4d5b07 | 331 | ERR("Failed to create buffer view for rate policy."); |
d35c7a38 JR |
332 | goto error; |
333 | } | |
334 | ||
7f4d5b07 JR |
335 | rate_policy_consumed_len = |
336 | lttng_rate_policy_create_from_payload( | |
d35c7a38 | 337 | &policy_view, &policy); |
7f4d5b07 | 338 | if (rate_policy_consumed_len < 0) { |
d35c7a38 JR |
339 | goto error; |
340 | } | |
341 | ||
7f4d5b07 JR |
342 | if (rate_policy_consumed_len != comm->rate_policy_len) { |
343 | ERR("Failed to deserialize rate policy object: " | |
d35c7a38 | 344 | "consumed-len: %zd, expected-len: %" PRIu32, |
7f4d5b07 JR |
345 | rate_policy_consumed_len, |
346 | comm->rate_policy_len); | |
d35c7a38 JR |
347 | goto error; |
348 | } | |
349 | ||
7f4d5b07 | 350 | status = lttng_action_snapshot_session_set_rate_policy( |
d35c7a38 JR |
351 | action, policy); |
352 | if (status != LTTNG_ACTION_STATUS_OK) { | |
353 | goto error; | |
354 | } | |
355 | } | |
356 | ||
7f4d5b07 JR |
357 | variable_data += comm->rate_policy_len; |
358 | consumed_len += comm->rate_policy_len; | |
d35c7a38 | 359 | |
757c48a2 SM |
360 | *p_action = action; |
361 | action = NULL; | |
362 | ||
363 | goto end; | |
364 | ||
365 | error: | |
366 | consumed_len = -1; | |
367 | ||
368 | end: | |
7f4d5b07 | 369 | lttng_rate_policy_destroy(policy); |
757c48a2 SM |
370 | lttng_action_snapshot_session_destroy(action); |
371 | lttng_snapshot_output_destroy(snapshot_output); | |
372 | ||
373 | return consumed_len; | |
374 | } | |
375 | ||
376 | struct lttng_action *lttng_action_snapshot_session_create(void) | |
377 | { | |
d35c7a38 | 378 | struct lttng_action *action = NULL; |
7f4d5b07 | 379 | struct lttng_rate_policy *policy = NULL; |
d35c7a38 JR |
380 | enum lttng_action_status status; |
381 | ||
7f4d5b07 JR |
382 | /* Create a every N = 1 rate policy. */ |
383 | policy = lttng_rate_policy_every_n_create(1); | |
d35c7a38 JR |
384 | if (!policy) { |
385 | goto end; | |
386 | } | |
757c48a2 SM |
387 | |
388 | action = zmalloc(sizeof(struct lttng_action_snapshot_session)); | |
389 | if (!action) { | |
390 | goto end; | |
391 | } | |
392 | ||
393 | lttng_action_init(action, LTTNG_ACTION_TYPE_SNAPSHOT_SESSION, | |
394 | lttng_action_snapshot_session_validate, | |
395 | lttng_action_snapshot_session_serialize, | |
396 | lttng_action_snapshot_session_is_equal, | |
2d57482c | 397 | lttng_action_snapshot_session_destroy, |
588c4b0d JG |
398 | lttng_action_snapshot_session_internal_get_rate_policy, |
399 | lttng_action_generic_add_error_query_results); | |
757c48a2 | 400 | |
7f4d5b07 | 401 | status = lttng_action_snapshot_session_set_rate_policy(action, policy); |
d35c7a38 JR |
402 | if (status != LTTNG_ACTION_STATUS_OK) { |
403 | free(action); | |
404 | action = NULL; | |
405 | goto end; | |
406 | } | |
407 | ||
757c48a2 | 408 | end: |
7f4d5b07 | 409 | lttng_rate_policy_destroy(policy); |
757c48a2 SM |
410 | return action; |
411 | } | |
412 | ||
413 | enum lttng_action_status lttng_action_snapshot_session_set_session_name( | |
414 | struct lttng_action *action, const char *session_name) | |
415 | { | |
416 | struct lttng_action_snapshot_session *action_snapshot_session; | |
417 | enum lttng_action_status status; | |
418 | ||
419 | if (!action || !IS_SNAPSHOT_SESSION_ACTION(action) || !session_name || | |
420 | strlen(session_name) == 0) { | |
421 | status = LTTNG_ACTION_STATUS_INVALID; | |
422 | goto end; | |
423 | } | |
424 | ||
425 | action_snapshot_session = action_snapshot_session_from_action(action); | |
426 | ||
427 | free(action_snapshot_session->session_name); | |
428 | ||
429 | action_snapshot_session->session_name = strdup(session_name); | |
430 | if (!action_snapshot_session->session_name) { | |
431 | status = LTTNG_ACTION_STATUS_ERROR; | |
432 | goto end; | |
433 | } | |
434 | ||
435 | status = LTTNG_ACTION_STATUS_OK; | |
436 | end: | |
437 | return status; | |
438 | } | |
439 | ||
440 | enum lttng_action_status lttng_action_snapshot_session_get_session_name( | |
441 | const struct lttng_action *action, const char **session_name) | |
442 | { | |
443 | const struct lttng_action_snapshot_session *action_snapshot_session; | |
444 | enum lttng_action_status status; | |
445 | ||
446 | if (!action || !IS_SNAPSHOT_SESSION_ACTION(action) || !session_name) { | |
447 | status = LTTNG_ACTION_STATUS_INVALID; | |
448 | goto end; | |
449 | } | |
450 | ||
451 | action_snapshot_session = action_snapshot_session_from_action_const(action); | |
452 | ||
453 | if (action_snapshot_session->session_name) { | |
454 | *session_name = action_snapshot_session->session_name; | |
455 | status = LTTNG_ACTION_STATUS_OK; | |
456 | } else { | |
457 | status = LTTNG_ACTION_STATUS_UNSET; | |
458 | } | |
459 | ||
460 | end: | |
461 | ||
462 | return status; | |
463 | } | |
464 | ||
465 | enum lttng_action_status lttng_action_snapshot_session_set_output( | |
466 | struct lttng_action *action, | |
467 | struct lttng_snapshot_output *output) | |
468 | { | |
469 | struct lttng_action_snapshot_session *action_snapshot_session; | |
470 | enum lttng_action_status status; | |
471 | ||
472 | if (!action || !IS_SNAPSHOT_SESSION_ACTION(action) || !output) { | |
473 | status = LTTNG_ACTION_STATUS_INVALID; | |
474 | goto end; | |
475 | } | |
476 | ||
477 | action_snapshot_session = action_snapshot_session_from_action(action); | |
478 | ||
479 | lttng_snapshot_output_destroy(action_snapshot_session->output); | |
480 | action_snapshot_session->output = output; | |
481 | ||
482 | status = LTTNG_ACTION_STATUS_OK; | |
483 | ||
484 | end: | |
485 | return status; | |
486 | } | |
487 | ||
488 | enum lttng_action_status lttng_action_snapshot_session_get_output( | |
489 | const struct lttng_action *action, | |
490 | const struct lttng_snapshot_output **output) | |
491 | { | |
492 | const struct lttng_action_snapshot_session *action_snapshot_session; | |
493 | enum lttng_action_status status; | |
494 | ||
495 | if (!action || !IS_SNAPSHOT_SESSION_ACTION(action)|| !output) { | |
496 | status = LTTNG_ACTION_STATUS_INVALID; | |
497 | goto end; | |
498 | } | |
499 | ||
500 | action_snapshot_session = action_snapshot_session_from_action_const(action); | |
501 | ||
502 | if (action_snapshot_session->output) { | |
503 | *output = action_snapshot_session->output; | |
504 | status = LTTNG_ACTION_STATUS_OK; | |
505 | } else { | |
506 | status = LTTNG_ACTION_STATUS_UNSET; | |
507 | } | |
508 | ||
509 | end: | |
510 | return status; | |
511 | } | |
d35c7a38 | 512 | |
7f4d5b07 | 513 | enum lttng_action_status lttng_action_snapshot_session_set_rate_policy( |
d35c7a38 | 514 | struct lttng_action *action, |
7f4d5b07 | 515 | const struct lttng_rate_policy *policy) |
d35c7a38 JR |
516 | { |
517 | enum lttng_action_status status; | |
518 | struct lttng_action_snapshot_session *snapshot_session_action; | |
7f4d5b07 | 519 | struct lttng_rate_policy *copy = NULL; |
d35c7a38 JR |
520 | |
521 | if (!action || !policy || !IS_SNAPSHOT_SESSION_ACTION(action)) { | |
522 | status = LTTNG_ACTION_STATUS_INVALID; | |
523 | goto end; | |
524 | } | |
525 | ||
7f4d5b07 | 526 | copy = lttng_rate_policy_copy(policy); |
d35c7a38 JR |
527 | if (!copy) { |
528 | status = LTTNG_ACTION_STATUS_ERROR; | |
529 | goto end; | |
530 | } | |
531 | ||
532 | snapshot_session_action = action_snapshot_session_from_action(action); | |
533 | ||
7f4d5b07 JR |
534 | /* Free the previous rate policy .*/ |
535 | lttng_rate_policy_destroy(snapshot_session_action->policy); | |
d35c7a38 JR |
536 | |
537 | /* Assign the policy. */ | |
538 | snapshot_session_action->policy = copy; | |
539 | status = LTTNG_ACTION_STATUS_OK; | |
540 | copy = NULL; | |
541 | ||
542 | end: | |
7f4d5b07 | 543 | lttng_rate_policy_destroy(copy); |
d35c7a38 JR |
544 | return status; |
545 | } | |
546 | ||
7f4d5b07 | 547 | enum lttng_action_status lttng_action_snapshot_session_get_rate_policy( |
d35c7a38 | 548 | const struct lttng_action *action, |
7f4d5b07 | 549 | const struct lttng_rate_policy **policy) |
d35c7a38 JR |
550 | { |
551 | enum lttng_action_status status; | |
552 | const struct lttng_action_snapshot_session *snapshot_session_action; | |
553 | ||
554 | if (!action || !policy || !IS_SNAPSHOT_SESSION_ACTION(action)) { | |
555 | status = LTTNG_ACTION_STATUS_INVALID; | |
556 | goto end; | |
557 | } | |
558 | ||
559 | snapshot_session_action = | |
560 | action_snapshot_session_from_action_const(action); | |
561 | ||
562 | *policy = snapshot_session_action->policy; | |
563 | status = LTTNG_ACTION_STATUS_OK; | |
564 | end: | |
565 | return status; | |
566 | } | |
2d57482c | 567 | |
7f4d5b07 JR |
568 | static const struct lttng_rate_policy * |
569 | lttng_action_snapshot_session_internal_get_rate_policy( | |
2d57482c JR |
570 | const struct lttng_action *action) |
571 | { | |
572 | const struct lttng_action_snapshot_session *_action; | |
573 | _action = action_snapshot_session_from_action_const(action); | |
574 | ||
575 | return _action->policy; | |
576 | } |