Commit | Line | Data |
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54d01ffb DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
71a559f8 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
54d01ffb | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
54d01ffb | 8 | * |
d14d33bf AM |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
54d01ffb | 13 | * |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
54d01ffb DG |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
d87bfb32 | 20 | #include <errno.h> |
54d01ffb | 21 | #include <urcu/list.h> |
2bdd86d4 | 22 | #include <string.h> |
54d01ffb DG |
23 | |
24 | #include <lttng/lttng.h> | |
db758600 | 25 | #include <common/error.h> |
10a8a223 | 26 | #include <common/sessiond-comm/sessiond-comm.h> |
71a559f8 JG |
27 | #include <common/filter.h> |
28 | #include <common/context.h> | |
54d01ffb DG |
29 | |
30 | #include "channel.h" | |
31 | #include "event.h" | |
4771f025 | 32 | #include "kernel.h" |
be6a6276 | 33 | #include "lttng-sessiond.h" |
9df8df5e | 34 | #include "ust-ctl.h" |
edb67388 DG |
35 | #include "ust-app.h" |
36 | #include "trace-kernel.h" | |
37 | #include "trace-ust.h" | |
7c1d2758 | 38 | #include "agent.h" |
54d01ffb | 39 | |
025faf73 DG |
40 | /* |
41 | * Add unique UST event based on the event name, filter bytecode and loglevel. | |
42 | */ | |
18eace3b DG |
43 | static void add_unique_ust_event(struct lttng_ht *ht, |
44 | struct ltt_ust_event *event) | |
45 | { | |
46 | struct cds_lfht_node *node_ptr; | |
47 | struct ltt_ust_ht_key key; | |
48 | ||
49 | assert(ht); | |
50 | assert(ht->ht); | |
51 | assert(event); | |
52 | ||
53 | key.name = event->attr.name; | |
54 | key.filter = (struct lttng_filter_bytecode *) event->filter; | |
b953b8cd PP |
55 | key.loglevel_type = event->attr.loglevel_type; |
56 | key.loglevel_value = event->attr.loglevel; | |
4031e53e | 57 | key.exclusion = event->exclusion; |
18eace3b DG |
58 | |
59 | node_ptr = cds_lfht_add_unique(ht->ht, | |
60 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
61 | trace_ust_ht_match_event, &key, &event->node.node); | |
62 | assert(node_ptr == &event->node.node); | |
63 | } | |
64 | ||
54d01ffb | 65 | /* |
9550ee81 JR |
66 | * Disable kernel tracepoint events for a channel from the kernel session of |
67 | * a specified event_name and event type. | |
68 | * On type LTTNG_EVENT_ALL all events with event_name are disabled. | |
69 | * If event_name is NULL all events of the specified type are disabled. | |
54d01ffb | 70 | */ |
d0ae4ea8 | 71 | int event_kernel_disable_event(struct ltt_kernel_channel *kchan, |
9550ee81 | 72 | char *event_name, enum lttng_event_type type) |
54d01ffb | 73 | { |
9550ee81 | 74 | int ret, error = 0, found = 0; |
54d01ffb DG |
75 | struct ltt_kernel_event *kevent; |
76 | ||
0525e9ae DG |
77 | assert(kchan); |
78 | ||
54d01ffb DG |
79 | /* For each event in the kernel session */ |
80 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
d0ae4ea8 MD |
81 | if (type != LTTNG_EVENT_ALL && kevent->type != type) |
82 | continue; | |
9550ee81 JR |
83 | if (event_name != NULL && strcmp(event_name, kevent->event->name)) { |
84 | continue; | |
85 | } | |
86 | found++; | |
54d01ffb DG |
87 | ret = kernel_disable_event(kevent); |
88 | if (ret < 0) { | |
9550ee81 | 89 | error = 1; |
54d01ffb DG |
90 | continue; |
91 | } | |
92 | } | |
9550ee81 JR |
93 | DBG("Disable kernel event: found %d events with name: %s and type: %d", |
94 | found, event_name ? event_name : "NULL", type); | |
7a3d1328 | 95 | |
9550ee81 JR |
96 | if (event_name != NULL && !found) { |
97 | ret = LTTNG_ERR_NO_EVENT; | |
98 | } else { | |
99 | ret = error ? LTTNG_ERR_KERN_DISABLE_FAIL : LTTNG_OK; | |
100 | } | |
101 | ||
102 | return ret; | |
54d01ffb DG |
103 | } |
104 | ||
105 | /* | |
7a3d1328 | 106 | * Enable kernel tracepoint event for a channel from the kernel session. |
49d21f93 | 107 | * We own filter_expression and filter. |
54d01ffb | 108 | */ |
d0ae4ea8 | 109 | int event_kernel_enable_event(struct ltt_kernel_channel *kchan, |
00a62084 MD |
110 | struct lttng_event *event, char *filter_expression, |
111 | struct lttng_filter_bytecode *filter) | |
54d01ffb DG |
112 | { |
113 | int ret; | |
114 | struct ltt_kernel_event *kevent; | |
115 | ||
0525e9ae DG |
116 | assert(kchan); |
117 | assert(event); | |
118 | ||
00a62084 MD |
119 | kevent = trace_kernel_find_event(event->name, kchan, |
120 | event->type, filter); | |
54d01ffb | 121 | if (kevent == NULL) { |
00a62084 MD |
122 | ret = kernel_create_event(event, kchan, |
123 | filter_expression, filter); | |
a969e101 MD |
124 | /* We have passed ownership */ |
125 | filter_expression = NULL; | |
126 | filter = NULL; | |
54d01ffb | 127 | if (ret < 0) { |
bd29c13d DG |
128 | switch (-ret) { |
129 | case EEXIST: | |
f73fabfd | 130 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
bd29c13d DG |
131 | break; |
132 | case ENOSYS: | |
f73fabfd | 133 | ret = LTTNG_ERR_KERN_EVENT_ENOSYS; |
bd29c13d DG |
134 | break; |
135 | default: | |
f73fabfd | 136 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
bd29c13d | 137 | break; |
d87bfb32 | 138 | } |
7a3d1328 | 139 | goto end; |
54d01ffb DG |
140 | } |
141 | } else if (kevent->enabled == 0) { | |
142 | ret = kernel_enable_event(kevent); | |
143 | if (ret < 0) { | |
f73fabfd | 144 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
7a3d1328 | 145 | goto end; |
54d01ffb | 146 | } |
42224349 DG |
147 | } else { |
148 | /* At this point, the event is considered enabled */ | |
f73fabfd | 149 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
42224349 | 150 | goto end; |
54d01ffb | 151 | } |
42224349 | 152 | |
f73fabfd | 153 | ret = LTTNG_OK; |
7a3d1328 | 154 | end: |
a969e101 MD |
155 | free(filter_expression); |
156 | free(filter); | |
54d01ffb DG |
157 | return ret; |
158 | } | |
159 | ||
7f79d3a1 DG |
160 | /* |
161 | * ============================ | |
162 | * UST : The Ultimate Frontier! | |
163 | * ============================ | |
164 | */ | |
165 | ||
2bdd86d4 MD |
166 | /* |
167 | * Enable UST tracepoint event for a channel from a UST session. | |
49d21f93 | 168 | * We own filter_expression, filter, and exclusion. |
2bdd86d4 | 169 | */ |
7972aab2 | 170 | int event_ust_enable_tracepoint(struct ltt_ust_session *usess, |
025faf73 | 171 | struct ltt_ust_channel *uchan, struct lttng_event *event, |
6b453b5e | 172 | char *filter_expression, |
f1613f52 | 173 | struct lttng_filter_bytecode *filter, |
88f06f15 JG |
174 | struct lttng_event_exclusion *exclusion, |
175 | bool internal_event) | |
2bdd86d4 | 176 | { |
f73fabfd | 177 | int ret = LTTNG_OK, to_create = 0; |
edb67388 DG |
178 | struct ltt_ust_event *uevent; |
179 | ||
0525e9ae DG |
180 | assert(usess); |
181 | assert(uchan); | |
182 | assert(event); | |
183 | ||
18eace3b DG |
184 | rcu_read_lock(); |
185 | ||
025faf73 | 186 | uevent = trace_ust_find_event(uchan->events, event->name, filter, |
b953b8cd | 187 | event->loglevel_type, event->loglevel, exclusion); |
87c6e328 | 188 | if (!uevent) { |
6b453b5e | 189 | uevent = trace_ust_create_event(event, filter_expression, |
87c6e328 | 190 | filter, exclusion, internal_event); |
49d21f93 MD |
191 | /* We have passed ownership */ |
192 | filter_expression = NULL; | |
193 | filter = NULL; | |
194 | exclusion = NULL; | |
edb67388 | 195 | if (uevent == NULL) { |
95a82664 | 196 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
edb67388 DG |
197 | goto error; |
198 | } | |
025faf73 | 199 | |
fc34caaa | 200 | /* Valid to set it after the goto error since uevent is still NULL */ |
edb67388 DG |
201 | to_create = 1; |
202 | } | |
2bdd86d4 | 203 | |
7f79d3a1 DG |
204 | if (uevent->enabled) { |
205 | /* It's already enabled so everything is OK */ | |
5bcdda4f | 206 | ret = LTTNG_ERR_UST_EVENT_ENABLED; |
7f79d3a1 DG |
207 | goto end; |
208 | } | |
209 | ||
fc34caaa DG |
210 | uevent->enabled = 1; |
211 | ||
7972aab2 DG |
212 | if (to_create) { |
213 | /* Create event on all UST registered apps for session */ | |
214 | ret = ust_app_create_event_glb(usess, uchan, uevent); | |
215 | } else { | |
216 | /* Enable event on all UST registered apps for session */ | |
217 | ret = ust_app_enable_event_glb(usess, uchan, uevent); | |
218 | } | |
48842b30 | 219 | |
7972aab2 DG |
220 | if (ret < 0) { |
221 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
222 | ret = LTTNG_ERR_UST_EVENT_EXIST; | |
223 | goto end; | |
224 | } else { | |
225 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
226 | goto error; | |
edb67388 | 227 | } |
2bdd86d4 | 228 | } |
48842b30 | 229 | |
7f79d3a1 | 230 | if (to_create) { |
fc34caaa | 231 | /* Add ltt ust event to channel */ |
18eace3b | 232 | add_unique_ust_event(uchan->events, uevent); |
7f79d3a1 | 233 | } |
edb67388 | 234 | |
7f79d3a1 DG |
235 | DBG("Event UST %s %s in channel %s", uevent->attr.name, |
236 | to_create ? "created" : "enabled", uchan->name); | |
237 | ||
f73fabfd | 238 | ret = LTTNG_OK; |
fc34caaa | 239 | |
fb89d070 | 240 | end: |
18eace3b | 241 | rcu_read_unlock(); |
49d21f93 MD |
242 | free(filter_expression); |
243 | free(filter); | |
244 | free(exclusion); | |
fc34caaa | 245 | return ret; |
edb67388 DG |
246 | |
247 | error: | |
fc34caaa DG |
248 | /* |
249 | * Only destroy event on creation time (not enabling time) because if the | |
250 | * event is found in the channel (to_create == 0), it means that at some | |
251 | * point the enable_event worked and it's thus valid to keep it alive. | |
252 | * Destroying it also implies that we also destroy it's shadow copy to sync | |
253 | * everyone up. | |
254 | */ | |
255 | if (to_create) { | |
256 | /* In this code path, the uevent was not added to the hash table */ | |
257 | trace_ust_destroy_event(uevent); | |
258 | } | |
18eace3b | 259 | rcu_read_unlock(); |
49d21f93 MD |
260 | free(filter_expression); |
261 | free(filter); | |
262 | free(exclusion); | |
2bdd86d4 MD |
263 | return ret; |
264 | } | |
265 | ||
7f79d3a1 DG |
266 | /* |
267 | * Disable UST tracepoint of a channel from a UST session. | |
268 | */ | |
7972aab2 | 269 | int event_ust_disable_tracepoint(struct ltt_ust_session *usess, |
7f79d3a1 | 270 | struct ltt_ust_channel *uchan, char *event_name) |
2bdd86d4 MD |
271 | { |
272 | int ret; | |
7f79d3a1 | 273 | struct ltt_ust_event *uevent; |
18eace3b DG |
274 | struct lttng_ht_node_str *node; |
275 | struct lttng_ht_iter iter; | |
18eace3b | 276 | struct lttng_ht *ht; |
2bdd86d4 | 277 | |
0525e9ae DG |
278 | assert(usess); |
279 | assert(uchan); | |
280 | assert(event_name); | |
281 | ||
18eace3b DG |
282 | ht = uchan->events; |
283 | ||
18eace3b | 284 | rcu_read_lock(); |
025faf73 DG |
285 | |
286 | /* | |
287 | * We use a custom lookup since we need the iterator for the next_duplicate | |
288 | * call in the do while loop below. | |
289 | */ | |
290 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) event_name, lttng_ht_seed), | |
291 | trace_ust_ht_match_event_by_name, event_name, &iter.iter); | |
18eace3b DG |
292 | node = lttng_ht_iter_get_node_str(&iter); |
293 | if (node == NULL) { | |
294 | DBG2("Trace UST event NOT found by name %s", event_name); | |
f73fabfd | 295 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
7f79d3a1 | 296 | goto error; |
2bdd86d4 | 297 | } |
7f79d3a1 | 298 | |
18eace3b DG |
299 | do { |
300 | uevent = caa_container_of(node, struct ltt_ust_event, node); | |
025faf73 DG |
301 | assert(uevent); |
302 | ||
18eace3b DG |
303 | if (uevent->enabled == 0) { |
304 | /* It's already disabled so everything is OK */ | |
a1dcaf0f | 305 | goto next; |
7f79d3a1 | 306 | } |
18eace3b | 307 | |
7972aab2 DG |
308 | ret = ust_app_disable_event_glb(usess, uchan, uevent); |
309 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { | |
310 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
18eace3b DG |
311 | goto error; |
312 | } | |
18eace3b DG |
313 | uevent->enabled = 0; |
314 | ||
025faf73 DG |
315 | DBG2("Event UST %s disabled in channel %s", uevent->attr.name, |
316 | uchan->name); | |
317 | ||
a1dcaf0f | 318 | next: |
18eace3b DG |
319 | /* Get next duplicate event by name. */ |
320 | cds_lfht_next_duplicate(ht->ht, trace_ust_ht_match_event_by_name, | |
321 | event_name, &iter.iter); | |
322 | node = lttng_ht_iter_get_node_str(&iter); | |
323 | } while (node); | |
7f79d3a1 | 324 | |
f73fabfd | 325 | ret = LTTNG_OK; |
7f79d3a1 | 326 | |
7f79d3a1 | 327 | error: |
18eace3b | 328 | rcu_read_unlock(); |
7f79d3a1 DG |
329 | return ret; |
330 | } | |
331 | ||
b1e7fe2d JR |
332 | /* |
333 | * Disable all UST tracepoints for a channel from a UST session. | |
334 | */ | |
335 | int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess, | |
336 | struct ltt_ust_channel *uchan) | |
337 | { | |
3e81c0f2 | 338 | int ret, i, size, error = 0; |
b1e7fe2d JR |
339 | struct lttng_ht_iter iter; |
340 | struct ltt_ust_event *uevent = NULL; | |
341 | struct lttng_event *events = NULL; | |
342 | ||
343 | assert(usess); | |
344 | assert(uchan); | |
345 | ||
346 | rcu_read_lock(); | |
347 | ||
348 | /* Disabling existing events */ | |
349 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, | |
350 | node.node) { | |
351 | if (uevent->enabled == 1) { | |
352 | ret = event_ust_disable_tracepoint(usess, uchan, | |
353 | uevent->attr.name); | |
354 | if (ret < 0) { | |
3e81c0f2 | 355 | error = LTTNG_ERR_UST_DISABLE_FAIL; |
b1e7fe2d JR |
356 | continue; |
357 | } | |
358 | } | |
359 | } | |
360 | ||
361 | /* Get all UST available events */ | |
362 | size = ust_app_list_events(&events); | |
363 | if (size < 0) { | |
364 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
365 | goto error; | |
366 | } | |
367 | ||
368 | for (i = 0; i < size; i++) { | |
369 | ret = event_ust_disable_tracepoint(usess, uchan, | |
370 | events[i].name); | |
3e81c0f2 | 371 | if (ret < 0) { |
b1e7fe2d | 372 | /* Continue to disable the rest... */ |
3e81c0f2 | 373 | error = LTTNG_ERR_UST_DISABLE_FAIL; |
b1e7fe2d JR |
374 | continue; |
375 | } | |
376 | } | |
377 | ||
3e81c0f2 | 378 | ret = error ? error : LTTNG_OK; |
b1e7fe2d JR |
379 | error: |
380 | rcu_read_unlock(); | |
381 | free(events); | |
382 | return ret; | |
383 | } | |
384 | ||
f20baf8e | 385 | /* |
022d91ba | 386 | * Enable all agent event for a given UST session. |
f20baf8e DG |
387 | * |
388 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
389 | */ | |
022d91ba | 390 | int event_agent_enable_all(struct ltt_ust_session *usess, |
fefd409b | 391 | struct agent *agt, struct lttng_event *event, |
51755dc8 | 392 | struct lttng_filter_bytecode *filter ,char *filter_expression) |
f20baf8e DG |
393 | { |
394 | int ret; | |
fefd409b | 395 | struct agent_event *aevent; |
f20baf8e DG |
396 | struct lttng_ht_iter iter; |
397 | ||
398 | assert(usess); | |
399 | ||
022d91ba | 400 | DBG("Event agent enabling ALL events for session %" PRIu64, usess->id); |
f20baf8e | 401 | |
022d91ba | 402 | /* Enable event on agent application through TCP socket. */ |
8404118c | 403 | ret = event_agent_enable(usess, agt, event, filter, filter_expression); |
f20baf8e DG |
404 | if (ret != LTTNG_OK) { |
405 | goto error; | |
406 | } | |
407 | ||
408 | /* Flag every event that they are now enabled. */ | |
409 | rcu_read_lock(); | |
fefd409b | 410 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent, |
f20baf8e | 411 | node.node) { |
fefd409b | 412 | aevent->enabled = 1; |
f20baf8e DG |
413 | } |
414 | rcu_read_unlock(); | |
415 | ||
416 | ret = LTTNG_OK; | |
417 | ||
418 | error: | |
419 | return ret; | |
420 | } | |
421 | ||
71a559f8 JG |
422 | /* |
423 | * Check if this event's filter requires the activation of application contexts | |
424 | * and enable them in the agent. | |
425 | */ | |
426 | static int add_filter_app_ctx(struct lttng_filter_bytecode *bytecode, | |
427 | const char *filter_expression, struct agent *agt) | |
428 | { | |
429 | int ret = LTTNG_OK; | |
430 | char *provider_name = NULL, *ctx_name = NULL; | |
431 | struct bytecode_symbol_iterator *it = | |
432 | bytecode_symbol_iterator_create(bytecode); | |
433 | ||
434 | if (!it) { | |
435 | ret = LTTNG_ERR_NOMEM; | |
436 | goto end; | |
437 | } | |
438 | ||
439 | do { | |
440 | struct lttng_event_context ctx; | |
441 | const char *symbol_name = | |
442 | bytecode_symbol_iterator_get_name(it); | |
443 | ||
444 | if (parse_application_context(symbol_name, &provider_name, | |
445 | &ctx_name)) { | |
446 | /* Not an application context. */ | |
447 | continue; | |
448 | } | |
449 | ||
450 | ctx.ctx = LTTNG_EVENT_CONTEXT_APP_CONTEXT; | |
451 | ctx.u.app_ctx.provider_name = provider_name; | |
452 | ctx.u.app_ctx.ctx_name = ctx_name; | |
453 | ||
454 | /* Recognized an application context. */ | |
455 | DBG("Enabling event with filter expression \"%s\" requires enabling the %s:%s application context.", | |
456 | filter_expression, provider_name, ctx_name); | |
457 | ||
458 | ret = agent_add_context(&ctx, agt); | |
459 | if (ret != LTTNG_OK) { | |
460 | ERR("Failed to add application context %s:%s.", | |
461 | provider_name, ctx_name); | |
462 | goto end; | |
463 | } | |
464 | ||
465 | ret = agent_enable_context(&ctx, agt->domain); | |
466 | if (ret != LTTNG_OK) { | |
467 | ERR("Failed to enable application context %s:%s.", | |
468 | provider_name, ctx_name); | |
469 | goto end; | |
470 | } | |
471 | ||
472 | free(provider_name); | |
473 | free(ctx_name); | |
474 | provider_name = ctx_name = NULL; | |
475 | } while (bytecode_symbol_iterator_next(it) == 0); | |
476 | end: | |
477 | free(provider_name); | |
478 | free(ctx_name); | |
479 | bytecode_symbol_iterator_destroy(it); | |
480 | return ret; | |
481 | } | |
482 | ||
f20baf8e | 483 | /* |
022d91ba | 484 | * Enable a single agent event for a given UST session. |
f20baf8e DG |
485 | * |
486 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
487 | */ | |
fefd409b DG |
488 | int event_agent_enable(struct ltt_ust_session *usess, |
489 | struct agent *agt, struct lttng_event *event, | |
8404118c JG |
490 | struct lttng_filter_bytecode *filter, |
491 | char *filter_expression) | |
f20baf8e DG |
492 | { |
493 | int ret, created = 0; | |
fefd409b | 494 | struct agent_event *aevent; |
f20baf8e DG |
495 | |
496 | assert(usess); | |
497 | assert(event); | |
fefd409b | 498 | assert(agt); |
f20baf8e | 499 | |
022d91ba | 500 | DBG("Event agent enabling %s for session %" PRIu64 " with loglevel type %d " |
51755dc8 JG |
501 | ", loglevel %d and filter \"%s\"", event->name, |
502 | usess->id, event->loglevel_type, event->loglevel, | |
503 | filter_expression ? filter_expression : "NULL"); | |
f20baf8e | 504 | |
a9319624 | 505 | aevent = agent_find_event(event->name, event->loglevel_type, |
71a559f8 | 506 | event->loglevel, filter_expression, agt); |
fefd409b | 507 | if (!aevent) { |
a9319624 PP |
508 | aevent = agent_create_event(event->name, event->loglevel_type, |
509 | event->loglevel, filter, | |
51755dc8 | 510 | filter_expression); |
fefd409b | 511 | if (!aevent) { |
f20baf8e DG |
512 | ret = LTTNG_ERR_NOMEM; |
513 | goto error; | |
514 | } | |
71a559f8 | 515 | |
f20baf8e DG |
516 | created = 1; |
517 | } | |
518 | ||
519 | /* Already enabled? */ | |
fefd409b | 520 | if (aevent->enabled) { |
f20baf8e DG |
521 | goto end; |
522 | } | |
523 | ||
71a559f8 JG |
524 | if (created && filter) { |
525 | ret = add_filter_app_ctx(filter, filter_expression, agt); | |
526 | if (ret != LTTNG_OK) { | |
527 | goto error; | |
528 | } | |
529 | } | |
530 | ||
fefd409b | 531 | ret = agent_enable_event(aevent, agt->domain); |
f20baf8e DG |
532 | if (ret != LTTNG_OK) { |
533 | goto error; | |
534 | } | |
535 | ||
536 | /* If the event was created prior to the enable, add it to the domain. */ | |
537 | if (created) { | |
fefd409b | 538 | agent_add_event(aevent, agt); |
f20baf8e DG |
539 | } |
540 | ||
541 | end: | |
542 | return LTTNG_OK; | |
543 | ||
544 | error: | |
545 | if (created) { | |
fefd409b | 546 | agent_destroy_event(aevent); |
f20baf8e DG |
547 | } |
548 | return ret; | |
549 | } | |
550 | ||
da6c3a50 | 551 | /* |
d1ec8e20 JG |
552 | * Return the default event name associated with the provided UST domain. Return |
553 | * NULL on error. | |
da6c3a50 DG |
554 | */ |
555 | const char *event_get_default_agent_ust_name(enum lttng_domain_type domain) | |
556 | { | |
557 | const char *default_event_name = NULL; | |
558 | ||
0e115563 DG |
559 | switch (domain) { |
560 | case LTTNG_DOMAIN_LOG4J: | |
d1ec8e20 | 561 | default_event_name = DEFAULT_LOG4J_EVENT_NAME; |
0e115563 DG |
562 | break; |
563 | case LTTNG_DOMAIN_JUL: | |
d1ec8e20 | 564 | default_event_name = DEFAULT_JUL_EVENT_NAME; |
0e115563 DG |
565 | break; |
566 | case LTTNG_DOMAIN_PYTHON: | |
e7c82272 | 567 | default_event_name = DEFAULT_PYTHON_EVENT_NAME; |
0e115563 DG |
568 | break; |
569 | default: | |
da6c3a50 DG |
570 | assert(0); |
571 | } | |
572 | ||
573 | return default_event_name; | |
574 | } | |
575 | ||
f20baf8e | 576 | /* |
e261a6cc | 577 | * Disable a given agent event for a given UST session. |
f20baf8e | 578 | * |
e261a6cc | 579 | * Must be called with the RCU read lock held. |
f20baf8e DG |
580 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
581 | */ | |
e261a6cc PP |
582 | static int event_agent_disable_one(struct ltt_ust_session *usess, |
583 | struct agent *agt, struct agent_event *aevent) | |
f20baf8e DG |
584 | { |
585 | int ret; | |
be6a6276 DG |
586 | struct ltt_ust_event *uevent = NULL; |
587 | struct ltt_ust_channel *uchan = NULL; | |
71aecbf8 | 588 | const char *ust_event_name, *ust_channel_name; |
f20baf8e | 589 | |
fefd409b | 590 | assert(agt); |
f20baf8e | 591 | assert(usess); |
e261a6cc | 592 | assert(aevent); |
f20baf8e | 593 | |
e261a6cc PP |
594 | DBG("Event agent disabling %s (loglevel type %d, loglevel value %d) for session %" PRIu64, |
595 | aevent->name, aevent->loglevel_type, aevent->loglevel_value, | |
596 | usess->id); | |
f20baf8e DG |
597 | |
598 | /* Already disabled? */ | |
fefd409b | 599 | if (!aevent->enabled) { |
f20baf8e DG |
600 | goto end; |
601 | } | |
602 | ||
71aecbf8 DG |
603 | if (agt->domain == LTTNG_DOMAIN_JUL) { |
604 | ust_channel_name = DEFAULT_JUL_CHANNEL_NAME; | |
605 | } else if (agt->domain == LTTNG_DOMAIN_LOG4J) { | |
606 | ust_channel_name = DEFAULT_LOG4J_CHANNEL_NAME; | |
0e115563 DG |
607 | } else if (agt->domain == LTTNG_DOMAIN_PYTHON) { |
608 | ust_channel_name = DEFAULT_PYTHON_CHANNEL_NAME; | |
71aecbf8 DG |
609 | } else { |
610 | ret = LTTNG_ERR_INVALID; | |
611 | goto error; | |
612 | } | |
613 | ||
be6a6276 DG |
614 | /* |
615 | * Disable it on the UST side. First get the channel reference then find | |
616 | * the event and finally disable it. | |
617 | */ | |
618 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, | |
71aecbf8 | 619 | (char *) ust_channel_name); |
be6a6276 DG |
620 | if (!uchan) { |
621 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
622 | goto error; | |
623 | } | |
624 | ||
da6c3a50 DG |
625 | ust_event_name = event_get_default_agent_ust_name(agt->domain); |
626 | if (!ust_event_name) { | |
627 | ret = LTTNG_ERR_FATAL; | |
628 | goto error; | |
be6a6276 DG |
629 | } |
630 | ||
631 | /* | |
b953b8cd PP |
632 | * Agent UST event has its loglevel type forced to |
633 | * LTTNG_UST_LOGLEVEL_ALL. The actual loglevel type/value filtering | |
634 | * happens thanks to an UST filter. The following -1 is actually | |
635 | * ignored since the type is LTTNG_UST_LOGLEVEL_ALL. | |
be6a6276 | 636 | */ |
da6c3a50 | 637 | uevent = trace_ust_find_event(uchan->events, (char *) ust_event_name, |
b953b8cd | 638 | aevent->filter, LTTNG_UST_LOGLEVEL_ALL, -1, NULL); |
022d91ba | 639 | /* If the agent event exists, it must be available on the UST side. */ |
be6a6276 DG |
640 | assert(uevent); |
641 | ||
642 | ret = ust_app_disable_event_glb(usess, uchan, uevent); | |
643 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { | |
644 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
645 | goto error; | |
646 | } | |
647 | ||
0dcfcf94 DG |
648 | /* |
649 | * Flag event that it's disabled so the shadow copy on the ust app side | |
650 | * will disable it if an application shows up. | |
651 | */ | |
652 | uevent->enabled = 0; | |
653 | ||
fefd409b | 654 | ret = agent_disable_event(aevent, agt->domain); |
f20baf8e DG |
655 | if (ret != LTTNG_OK) { |
656 | goto error; | |
657 | } | |
658 | ||
659 | end: | |
660 | return LTTNG_OK; | |
661 | ||
662 | error: | |
663 | return ret; | |
664 | } | |
e261a6cc PP |
665 | |
666 | /* | |
667 | * Disable all agent events matching a given name for a given UST session. | |
668 | * | |
669 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
670 | */ | |
671 | int event_agent_disable(struct ltt_ust_session *usess, struct agent *agt, | |
672 | char *event_name) | |
673 | { | |
674 | int ret = LTTNG_OK; | |
675 | struct agent_event *aevent; | |
676 | struct lttng_ht_iter iter; | |
677 | struct lttng_ht_node_str *node; | |
678 | ||
679 | assert(agt); | |
680 | assert(usess); | |
681 | assert(event_name); | |
682 | ||
683 | DBG("Event agent disabling %s (all loglevels) for session %" PRIu64, event_name, usess->id); | |
684 | ||
685 | rcu_read_lock(); | |
686 | agent_find_events_by_name(event_name, agt, &iter); | |
687 | node = lttng_ht_iter_get_node_str(&iter); | |
688 | ||
689 | if (node == NULL) { | |
690 | DBG2("Event agent NOT found by name %s", event_name); | |
691 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
692 | goto end; | |
693 | } | |
694 | ||
695 | do { | |
696 | aevent = caa_container_of(node, struct agent_event, node); | |
697 | ret = event_agent_disable_one(usess, agt, aevent); | |
698 | ||
699 | if (ret != LTTNG_OK) { | |
700 | goto end; | |
701 | } | |
702 | ||
703 | /* Get next duplicate agent event by name. */ | |
704 | agent_event_next_duplicate(event_name, agt, &iter); | |
705 | node = lttng_ht_iter_get_node_str(&iter); | |
706 | } while (node); | |
707 | end: | |
708 | rcu_read_unlock(); | |
709 | return ret; | |
710 | } | |
f20baf8e | 711 | /* |
022d91ba | 712 | * Disable all agent event for a given UST session. |
f20baf8e DG |
713 | * |
714 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
715 | */ | |
fefd409b DG |
716 | int event_agent_disable_all(struct ltt_ust_session *usess, |
717 | struct agent *agt) | |
f20baf8e | 718 | { |
0dcfcf94 | 719 | int ret; |
fefd409b | 720 | struct agent_event *aevent; |
f20baf8e DG |
721 | struct lttng_ht_iter iter; |
722 | ||
fefd409b | 723 | assert(agt); |
f20baf8e DG |
724 | assert(usess); |
725 | ||
0dcfcf94 DG |
726 | /* |
727 | * Disable event on agent application. Continue to disable all other events | |
728 | * if the * event is not found. | |
729 | */ | |
fefd409b | 730 | ret = event_agent_disable(usess, agt, "*"); |
0dcfcf94 DG |
731 | if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_NOT_FOUND) { |
732 | goto error; | |
f20baf8e DG |
733 | } |
734 | ||
b9866e08 | 735 | /* Disable every event. */ |
f20baf8e | 736 | rcu_read_lock(); |
fefd409b | 737 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent, |
f20baf8e | 738 | node.node) { |
0dcfcf94 DG |
739 | if (!aevent->enabled) { |
740 | continue; | |
741 | } | |
742 | ||
743 | ret = event_agent_disable(usess, agt, aevent->name); | |
744 | if (ret != LTTNG_OK) { | |
b9866e08 | 745 | goto error_unlock; |
f20baf8e | 746 | } |
f20baf8e | 747 | } |
f20baf8e DG |
748 | ret = LTTNG_OK; |
749 | ||
b9866e08 JG |
750 | error_unlock: |
751 | rcu_read_unlock(); | |
f20baf8e DG |
752 | error: |
753 | return ret; | |
754 | } |