Commit | Line | Data |
---|---|---|
0475c50c DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
6c1c0768 | 18 | #define _LGPL_SOURCE |
0475c50c | 19 | #include <assert.h> |
f20baf8e | 20 | #include <urcu/uatomic.h> |
0475c50c DG |
21 | |
22 | #include <common/common.h> | |
022d91ba | 23 | #include <common/sessiond-comm/agent.h> |
0475c50c | 24 | |
f263b7fd JD |
25 | #include <common/compat/endian.h> |
26 | ||
022d91ba | 27 | #include "agent.h" |
f20baf8e | 28 | #include "ust-app.h" |
0475c50c | 29 | #include "utils.h" |
23c2bd47 JG |
30 | #include "error.h" |
31 | ||
32 | #define AGENT_RET_CODE_INDEX(code) (code - AGENT_RET_CODE_SUCCESS) | |
33 | ||
34 | /* | |
35 | * Human readable agent return code. | |
36 | */ | |
37 | static const char *error_string_array[] = { | |
38 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_SUCCESS) ] = "Success", | |
39 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_INVALID) ] = "Invalid command", | |
40 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_UNKNOWN_NAME) ] = "Unknown logger name", | |
41 | ||
42 | /* Last element */ | |
43 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_NR) ] = "Unknown code", | |
44 | }; | |
45 | ||
46 | static | |
47 | void log_reply_code(uint32_t in_reply_ret_code) | |
48 | { | |
49 | int level = PRINT_DBG3; | |
50 | /* | |
51 | * reply_ret_code and in_reply_ret_code are kept separate to have a | |
52 | * sanitized value (used to retrieve the human readable string) and the | |
53 | * original value which is logged as-is. | |
54 | */ | |
55 | uint32_t reply_ret_code = in_reply_ret_code; | |
56 | ||
57 | if (reply_ret_code < AGENT_RET_CODE_SUCCESS || | |
58 | reply_ret_code >= AGENT_RET_CODE_NR) { | |
59 | reply_ret_code = AGENT_RET_CODE_NR; | |
60 | level = PRINT_ERR; | |
61 | } | |
62 | ||
63 | LOG(level, "Agent replied with retcode: %s (%"PRIu32")", | |
64 | error_string_array[AGENT_RET_CODE_INDEX( | |
65 | reply_ret_code)], | |
66 | in_reply_ret_code); | |
67 | } | |
0475c50c | 68 | |
4a4ab2c3 DG |
69 | /* |
70 | * Match function for the events hash table lookup by name. | |
71 | */ | |
72 | static int ht_match_event_by_name(struct cds_lfht_node *node, | |
73 | const void *_key) | |
74 | { | |
022d91ba DG |
75 | struct agent_event *event; |
76 | const struct agent_ht_key *key; | |
4a4ab2c3 DG |
77 | |
78 | assert(node); | |
79 | assert(_key); | |
80 | ||
022d91ba | 81 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
82 | key = _key; |
83 | ||
84 | /* Match 1 elements of the key: name. */ | |
85 | ||
86 | /* Event name */ | |
87 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
88 | goto no_match; | |
89 | } | |
90 | /* Match. */ | |
91 | return 1; | |
92 | ||
93 | no_match: | |
94 | return 0; | |
95 | } | |
96 | ||
97 | /* | |
98 | * Match function for the events hash table lookup by name and loglevel. | |
99 | */ | |
100 | static int ht_match_event(struct cds_lfht_node *node, | |
101 | const void *_key) | |
102 | { | |
022d91ba DG |
103 | struct agent_event *event; |
104 | const struct agent_ht_key *key; | |
19a97244 | 105 | int ll_match; |
4a4ab2c3 DG |
106 | |
107 | assert(node); | |
108 | assert(_key); | |
109 | ||
022d91ba | 110 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
111 | key = _key; |
112 | ||
113 | /* Match 2 elements of the key: name and loglevel. */ | |
114 | ||
115 | /* Event name */ | |
116 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
117 | goto no_match; | |
118 | } | |
119 | ||
a9319624 | 120 | /* Event loglevel value and type. */ |
19a97244 PP |
121 | ll_match = loglevels_match(event->loglevel_type, |
122 | event->loglevel_value, key->loglevel_type, | |
123 | key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL); | |
124 | ||
125 | if (!ll_match) { | |
4a4ab2c3 DG |
126 | goto no_match; |
127 | } | |
a9319624 | 128 | |
4a4ab2c3 DG |
129 | return 1; |
130 | ||
131 | no_match: | |
132 | return 0; | |
133 | } | |
134 | ||
135 | /* | |
022d91ba | 136 | * Add unique agent event based on the event name and loglevel. |
4a4ab2c3 | 137 | */ |
022d91ba DG |
138 | static void add_unique_agent_event(struct lttng_ht *ht, |
139 | struct agent_event *event) | |
4a4ab2c3 DG |
140 | { |
141 | struct cds_lfht_node *node_ptr; | |
022d91ba | 142 | struct agent_ht_key key; |
4a4ab2c3 DG |
143 | |
144 | assert(ht); | |
145 | assert(ht->ht); | |
146 | assert(event); | |
147 | ||
148 | key.name = event->name; | |
2106efa0 | 149 | key.loglevel_value = event->loglevel_value; |
a9319624 | 150 | key.loglevel_type = event->loglevel_type; |
4a4ab2c3 DG |
151 | |
152 | node_ptr = cds_lfht_add_unique(ht->ht, | |
153 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
154 | ht_match_event, &key, &event->node.node); | |
155 | assert(node_ptr == &event->node.node); | |
156 | } | |
157 | ||
0475c50c | 158 | /* |
022d91ba | 159 | * URCU delayed agent event reclaim. |
0475c50c | 160 | */ |
022d91ba | 161 | static void destroy_event_agent_rcu(struct rcu_head *head) |
0475c50c DG |
162 | { |
163 | struct lttng_ht_node_str *node = | |
164 | caa_container_of(head, struct lttng_ht_node_str, head); | |
022d91ba DG |
165 | struct agent_event *event = |
166 | caa_container_of(node, struct agent_event, node); | |
0475c50c | 167 | |
992febc7 | 168 | agent_destroy_event(event); |
0475c50c DG |
169 | } |
170 | ||
f20baf8e | 171 | /* |
022d91ba | 172 | * URCU delayed agent app reclaim. |
f20baf8e | 173 | */ |
022d91ba | 174 | static void destroy_app_agent_rcu(struct rcu_head *head) |
f20baf8e DG |
175 | { |
176 | struct lttng_ht_node_ulong *node = | |
177 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
022d91ba DG |
178 | struct agent_app *app = |
179 | caa_container_of(node, struct agent_app, node); | |
f20baf8e DG |
180 | |
181 | free(app); | |
182 | } | |
183 | ||
184 | /* | |
022d91ba DG |
185 | * Communication with the agent. Send the message header to the given socket in |
186 | * big endian. | |
f20baf8e DG |
187 | * |
188 | * Return 0 on success or else a negative errno message of sendmsg() op. | |
189 | */ | |
190 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, | |
191 | uint32_t cmd, uint32_t cmd_version) | |
192 | { | |
193 | int ret; | |
194 | ssize_t size; | |
022d91ba | 195 | struct lttcomm_agent_hdr msg; |
f20baf8e DG |
196 | |
197 | assert(sock); | |
198 | ||
53efb85a | 199 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
200 | msg.data_size = htobe64(data_size); |
201 | msg.cmd = htobe32(cmd); | |
202 | msg.cmd_version = htobe32(cmd_version); | |
203 | ||
204 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
205 | if (size < sizeof(msg)) { | |
206 | ret = -errno; | |
207 | goto error; | |
208 | } | |
209 | ret = 0; | |
210 | ||
211 | error: | |
212 | return ret; | |
213 | } | |
214 | ||
215 | /* | |
022d91ba DG |
216 | * Communication call with the agent. Send the payload to the given socket. The |
217 | * header MUST be sent prior to this call. | |
f20baf8e DG |
218 | * |
219 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
220 | */ | |
221 | static int send_payload(struct lttcomm_sock *sock, void *data, | |
222 | size_t size) | |
223 | { | |
224 | int ret; | |
225 | ssize_t len; | |
226 | ||
227 | assert(sock); | |
228 | assert(data); | |
229 | ||
230 | len = sock->ops->sendmsg(sock, data, size, 0); | |
231 | if (len < size) { | |
232 | ret = -errno; | |
233 | goto error; | |
234 | } | |
235 | ret = 0; | |
236 | ||
237 | error: | |
238 | return ret; | |
239 | } | |
240 | ||
241 | /* | |
022d91ba DG |
242 | * Communication call with the agent. Receive reply from the agent using the |
243 | * given socket. | |
f20baf8e DG |
244 | * |
245 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
246 | */ | |
247 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
248 | { | |
249 | int ret; | |
250 | ssize_t len; | |
251 | ||
252 | assert(sock); | |
253 | assert(buf); | |
254 | ||
255 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
256 | if (len < size) { | |
257 | ret = -errno; | |
258 | goto error; | |
259 | } | |
260 | ret = 0; | |
261 | ||
262 | error: | |
263 | return ret; | |
264 | } | |
265 | ||
3c6a091f | 266 | /* |
428de77a | 267 | * Internal event listing for a given app. Populate events. |
3c6a091f DG |
268 | * |
269 | * Return number of element in the list or else a negative LTTNG_ERR* code. | |
428de77a MD |
270 | * On success, the caller is responsible for freeing the memory |
271 | * allocated for "events". | |
3c6a091f | 272 | */ |
022d91ba | 273 | static ssize_t list_events(struct agent_app *app, struct lttng_event **events) |
3c6a091f DG |
274 | { |
275 | int ret, i, len = 0, offset = 0; | |
276 | uint32_t nb_event; | |
277 | size_t data_size; | |
d84af1a4 | 278 | uint32_t reply_ret_code; |
3c6a091f | 279 | struct lttng_event *tmp_events = NULL; |
022d91ba DG |
280 | struct lttcomm_agent_list_reply *reply = NULL; |
281 | struct lttcomm_agent_list_reply_hdr reply_hdr; | |
3c6a091f DG |
282 | |
283 | assert(app); | |
284 | assert(app->sock); | |
285 | assert(events); | |
286 | ||
022d91ba | 287 | DBG2("Agent listing events for app pid: %d and socket %d", app->pid, |
3c6a091f DG |
288 | app->sock->fd); |
289 | ||
022d91ba | 290 | ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0); |
3c6a091f DG |
291 | if (ret < 0) { |
292 | goto error_io; | |
293 | } | |
294 | ||
295 | /* Get list header so we know how much we'll receive. */ | |
296 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); | |
297 | if (ret < 0) { | |
298 | goto error_io; | |
299 | } | |
300 | ||
d84af1a4 JG |
301 | reply_ret_code = be32toh(reply_hdr.ret_code); |
302 | log_reply_code(reply_ret_code); | |
303 | switch (reply_ret_code) { | |
022d91ba | 304 | case AGENT_RET_CODE_SUCCESS: |
3c6a091f DG |
305 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
306 | break; | |
307 | default: | |
3bd9aaeb | 308 | ret = LTTNG_ERR_UNK; |
3c6a091f DG |
309 | goto error; |
310 | } | |
311 | ||
312 | reply = zmalloc(data_size); | |
313 | if (!reply) { | |
314 | ret = LTTNG_ERR_NOMEM; | |
315 | goto error; | |
316 | } | |
317 | ||
318 | /* Get the list with the appropriate data size. */ | |
319 | ret = recv_reply(app->sock, reply, data_size); | |
320 | if (ret < 0) { | |
321 | goto error_io; | |
322 | } | |
323 | ||
324 | nb_event = be32toh(reply->nb_event); | |
325 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); | |
326 | if (!tmp_events) { | |
327 | ret = LTTNG_ERR_NOMEM; | |
328 | goto error; | |
329 | } | |
330 | ||
331 | for (i = 0; i < nb_event; i++) { | |
332 | offset += len; | |
333 | strncpy(tmp_events[i].name, reply->payload + offset, | |
334 | sizeof(tmp_events[i].name)); | |
335 | tmp_events[i].pid = app->pid; | |
336 | tmp_events[i].enabled = -1; | |
337 | len = strlen(reply->payload + offset) + 1; | |
338 | } | |
339 | ||
340 | *events = tmp_events; | |
341 | ||
342 | free(reply); | |
343 | return nb_event; | |
344 | ||
345 | error_io: | |
346 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
347 | error: | |
348 | free(reply); | |
349 | free(tmp_events); | |
350 | return -ret; | |
351 | ||
352 | } | |
353 | ||
f20baf8e | 354 | /* |
022d91ba DG |
355 | * Internal enable agent event on a agent application. This function |
356 | * communicates with the agent to enable a given event. | |
f20baf8e DG |
357 | * |
358 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
359 | */ | |
022d91ba | 360 | static int enable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
361 | { |
362 | int ret; | |
a0ba721c | 363 | char *bytes_to_send; |
f20baf8e | 364 | uint64_t data_size; |
a0ba721c | 365 | size_t filter_expression_length; |
f4f9d4db | 366 | uint32_t reply_ret_code; |
022d91ba DG |
367 | struct lttcomm_agent_enable msg; |
368 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
369 | |
370 | assert(app); | |
371 | assert(app->sock); | |
372 | assert(event); | |
373 | ||
022d91ba | 374 | DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
375 | app->pid, app->sock->fd); |
376 | ||
a0ba721c AM |
377 | /* |
378 | * Calculate the payload's size, which is the fixed-size struct followed | |
379 | * by the variable-length filter expression (+1 for the ending \0). | |
380 | */ | |
381 | if (!event->filter_expression) { | |
382 | filter_expression_length = 0; | |
383 | } else { | |
384 | filter_expression_length = strlen(event->filter_expression) + 1; | |
385 | } | |
386 | data_size = sizeof(msg) + filter_expression_length; | |
f20baf8e | 387 | |
022d91ba | 388 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
f20baf8e DG |
389 | if (ret < 0) { |
390 | goto error_io; | |
391 | } | |
392 | ||
53efb85a | 393 | memset(&msg, 0, sizeof(msg)); |
2106efa0 | 394 | msg.loglevel_value = event->loglevel_value; |
b2064f54 | 395 | msg.loglevel_type = event->loglevel_type; |
f20baf8e | 396 | strncpy(msg.name, event->name, sizeof(msg.name)); |
a0ba721c AM |
397 | msg.filter_expression_length = filter_expression_length; |
398 | ||
399 | bytes_to_send = zmalloc(data_size); | |
400 | if (!bytes_to_send) { | |
401 | ret = LTTNG_ERR_NOMEM; | |
402 | goto error; | |
403 | } | |
404 | ||
405 | memcpy(bytes_to_send, &msg, sizeof(msg)); | |
406 | if (filter_expression_length > 0) { | |
407 | memcpy(bytes_to_send + sizeof(msg), event->filter_expression, | |
408 | filter_expression_length); | |
409 | } | |
410 | ||
411 | ret = send_payload(app->sock, bytes_to_send, data_size); | |
412 | free(bytes_to_send); | |
f20baf8e DG |
413 | if (ret < 0) { |
414 | goto error_io; | |
415 | } | |
416 | ||
417 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
418 | if (ret < 0) { | |
419 | goto error_io; | |
420 | } | |
421 | ||
f4f9d4db JG |
422 | reply_ret_code = be32toh(reply.ret_code); |
423 | log_reply_code(reply_ret_code); | |
424 | switch (reply_ret_code) { | |
022d91ba | 425 | case AGENT_RET_CODE_SUCCESS: |
f20baf8e | 426 | break; |
022d91ba | 427 | case AGENT_RET_CODE_UNKNOWN_NAME: |
f20baf8e DG |
428 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
429 | goto error; | |
430 | default: | |
3bd9aaeb | 431 | ret = LTTNG_ERR_UNK; |
f20baf8e DG |
432 | goto error; |
433 | } | |
434 | ||
435 | return LTTNG_OK; | |
436 | ||
437 | error_io: | |
438 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
439 | error: | |
440 | return ret; | |
441 | } | |
442 | ||
443 | /* | |
022d91ba DG |
444 | * Internal disable agent event call on a agent application. This function |
445 | * communicates with the agent to disable a given event. | |
f20baf8e DG |
446 | * |
447 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
448 | */ | |
022d91ba | 449 | static int disable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
450 | { |
451 | int ret; | |
452 | uint64_t data_size; | |
517992f8 | 453 | uint32_t reply_ret_code; |
022d91ba DG |
454 | struct lttcomm_agent_disable msg; |
455 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
456 | |
457 | assert(app); | |
458 | assert(app->sock); | |
459 | assert(event); | |
460 | ||
022d91ba | 461 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
462 | app->pid, app->sock->fd); |
463 | ||
464 | data_size = sizeof(msg); | |
465 | ||
022d91ba | 466 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
f20baf8e DG |
467 | if (ret < 0) { |
468 | goto error_io; | |
469 | } | |
470 | ||
53efb85a | 471 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
472 | strncpy(msg.name, event->name, sizeof(msg.name)); |
473 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
474 | if (ret < 0) { | |
475 | goto error_io; | |
476 | } | |
477 | ||
478 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
479 | if (ret < 0) { | |
480 | goto error_io; | |
481 | } | |
482 | ||
517992f8 JG |
483 | reply_ret_code = be32toh(reply.ret_code); |
484 | log_reply_code(reply_ret_code); | |
485 | switch (reply_ret_code) { | |
022d91ba DG |
486 | case AGENT_RET_CODE_SUCCESS: |
487 | break; | |
488 | case AGENT_RET_CODE_UNKNOWN_NAME: | |
489 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
490 | goto error; | |
491 | default: | |
3bd9aaeb | 492 | ret = LTTNG_ERR_UNK; |
022d91ba | 493 | goto error; |
f20baf8e DG |
494 | } |
495 | ||
496 | return LTTNG_OK; | |
497 | ||
498 | error_io: | |
499 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
500 | error: | |
501 | return ret; | |
502 | } | |
503 | ||
1b500e7a | 504 | /* |
022d91ba | 505 | * Send back the registration DONE command to a given agent application. |
1b500e7a DG |
506 | * |
507 | * Return 0 on success or else a negative value. | |
508 | */ | |
022d91ba | 509 | int agent_send_registration_done(struct agent_app *app) |
1b500e7a DG |
510 | { |
511 | assert(app); | |
512 | assert(app->sock); | |
513 | ||
022d91ba | 514 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
1b500e7a | 515 | |
b26d1f5c | 516 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0); |
1b500e7a DG |
517 | } |
518 | ||
f20baf8e | 519 | /* |
022d91ba | 520 | * Enable agent event on every agent applications registered with the session |
f20baf8e DG |
521 | * daemon. |
522 | * | |
523 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
524 | */ | |
fefd409b DG |
525 | int agent_enable_event(struct agent_event *event, |
526 | enum lttng_domain_type domain) | |
f20baf8e DG |
527 | { |
528 | int ret; | |
022d91ba | 529 | struct agent_app *app; |
f20baf8e DG |
530 | struct lttng_ht_iter iter; |
531 | ||
532 | assert(event); | |
533 | ||
534 | rcu_read_lock(); | |
535 | ||
022d91ba | 536 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 537 | node.node) { |
fefd409b DG |
538 | if (app->domain != domain) { |
539 | continue; | |
540 | } | |
541 | ||
022d91ba | 542 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
543 | ret = enable_event(app, event); |
544 | if (ret != LTTNG_OK) { | |
545 | goto error; | |
546 | } | |
f20baf8e DG |
547 | } |
548 | ||
3c6a091f | 549 | event->enabled = 1; |
f20baf8e DG |
550 | ret = LTTNG_OK; |
551 | ||
552 | error: | |
553 | rcu_read_unlock(); | |
554 | return ret; | |
555 | } | |
556 | ||
557 | /* | |
022d91ba | 558 | * Disable agent event on every agent applications registered with the session |
f20baf8e DG |
559 | * daemon. |
560 | * | |
561 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
562 | */ | |
fefd409b DG |
563 | int agent_disable_event(struct agent_event *event, |
564 | enum lttng_domain_type domain) | |
f20baf8e | 565 | { |
f1bc0129 | 566 | int ret = LTTNG_OK; |
022d91ba | 567 | struct agent_app *app; |
f20baf8e DG |
568 | struct lttng_ht_iter iter; |
569 | ||
570 | assert(event); | |
f1bc0129 JG |
571 | if (!event->enabled) { |
572 | goto end; | |
573 | } | |
f20baf8e DG |
574 | |
575 | rcu_read_lock(); | |
576 | ||
022d91ba | 577 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 578 | node.node) { |
fefd409b DG |
579 | if (app->domain != domain) { |
580 | continue; | |
581 | } | |
582 | ||
022d91ba | 583 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
584 | ret = disable_event(app, event); |
585 | if (ret != LTTNG_OK) { | |
586 | goto error; | |
587 | } | |
f20baf8e DG |
588 | } |
589 | ||
3c6a091f | 590 | event->enabled = 0; |
f20baf8e DG |
591 | |
592 | error: | |
593 | rcu_read_unlock(); | |
f1bc0129 | 594 | end: |
f20baf8e DG |
595 | return ret; |
596 | } | |
597 | ||
598 | /* | |
022d91ba DG |
599 | * Ask every agent for the list of possible event. Events is allocated with the |
600 | * events of every agent application. | |
f20baf8e DG |
601 | * |
602 | * Return the number of events or else a negative value. | |
603 | */ | |
f60140a1 DG |
604 | int agent_list_events(struct lttng_event **events, |
605 | enum lttng_domain_type domain) | |
f20baf8e DG |
606 | { |
607 | int ret; | |
608 | size_t nbmem, count = 0; | |
022d91ba | 609 | struct agent_app *app; |
aae6255e | 610 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
611 | struct lttng_ht_iter iter; |
612 | ||
613 | assert(events); | |
614 | ||
0e115563 DG |
615 | DBG2("Agent listing events for domain %d", domain); |
616 | ||
f20baf8e DG |
617 | nbmem = UST_APP_EVENT_LIST_SIZE; |
618 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
619 | if (!tmp_events) { | |
022d91ba | 620 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
621 | ret = -ENOMEM; |
622 | goto error; | |
623 | } | |
624 | ||
625 | rcu_read_lock(); | |
022d91ba | 626 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
627 | node.node) { |
628 | ssize_t nb_ev; | |
022d91ba | 629 | struct lttng_event *agent_events; |
f20baf8e | 630 | |
f60140a1 DG |
631 | /* Skip domain not asked by the list. */ |
632 | if (app->domain != domain) { | |
633 | continue; | |
634 | } | |
635 | ||
022d91ba | 636 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
637 | if (nb_ev < 0) { |
638 | ret = nb_ev; | |
428de77a | 639 | goto error_unlock; |
f20baf8e DG |
640 | } |
641 | ||
53efb85a | 642 | if (count + nb_ev > nbmem) { |
f20baf8e | 643 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
644 | struct lttng_event *new_tmp_events; |
645 | size_t new_nbmem; | |
646 | ||
647 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 648 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
649 | nbmem, new_nbmem); |
650 | new_tmp_events = realloc(tmp_events, | |
651 | new_nbmem * sizeof(*new_tmp_events)); | |
652 | if (!new_tmp_events) { | |
022d91ba | 653 | PERROR("realloc agent events"); |
f20baf8e | 654 | ret = -ENOMEM; |
022d91ba | 655 | free(agent_events); |
428de77a | 656 | goto error_unlock; |
f20baf8e | 657 | } |
53efb85a MD |
658 | /* Zero the new memory */ |
659 | memset(new_tmp_events + nbmem, 0, | |
660 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
661 | nbmem = new_nbmem; | |
662 | tmp_events = new_tmp_events; | |
f20baf8e | 663 | } |
022d91ba | 664 | memcpy(tmp_events + count, agent_events, |
53efb85a | 665 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 666 | free(agent_events); |
f20baf8e DG |
667 | count += nb_ev; |
668 | } | |
669 | rcu_read_unlock(); | |
670 | ||
671 | ret = count; | |
672 | *events = tmp_events; | |
aae6255e | 673 | return ret; |
f20baf8e | 674 | |
428de77a MD |
675 | error_unlock: |
676 | rcu_read_unlock(); | |
f20baf8e | 677 | error: |
aae6255e | 678 | free(tmp_events); |
f20baf8e DG |
679 | return ret; |
680 | } | |
681 | ||
682 | /* | |
022d91ba | 683 | * Create a agent app object using the given PID. |
f20baf8e DG |
684 | * |
685 | * Return newly allocated object or else NULL on error. | |
686 | */ | |
fefd409b DG |
687 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
688 | struct lttcomm_sock *sock) | |
f20baf8e | 689 | { |
022d91ba | 690 | struct agent_app *app; |
f20baf8e DG |
691 | |
692 | assert(sock); | |
693 | ||
694 | app = zmalloc(sizeof(*app)); | |
695 | if (!app) { | |
022d91ba | 696 | PERROR("zmalloc agent create"); |
f20baf8e DG |
697 | goto error; |
698 | } | |
699 | ||
700 | app->pid = pid; | |
fefd409b | 701 | app->domain = domain; |
f20baf8e | 702 | app->sock = sock; |
f20baf8e DG |
703 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
704 | ||
705 | error: | |
706 | return app; | |
707 | } | |
708 | ||
709 | /* | |
022d91ba | 710 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
711 | * |
712 | * RCU read side lock MUST be acquired. | |
713 | * | |
714 | * Return object if found else NULL. | |
715 | */ | |
022d91ba | 716 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
717 | { |
718 | struct lttng_ht_node_ulong *node; | |
719 | struct lttng_ht_iter iter; | |
022d91ba | 720 | struct agent_app *app; |
f20baf8e DG |
721 | |
722 | assert(sock >= 0); | |
723 | ||
022d91ba | 724 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
f20baf8e DG |
725 | node = lttng_ht_iter_get_node_ulong(&iter); |
726 | if (node == NULL) { | |
727 | goto error; | |
728 | } | |
022d91ba | 729 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 730 | |
022d91ba | 731 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
732 | return app; |
733 | ||
734 | error: | |
022d91ba | 735 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
736 | return NULL; |
737 | } | |
738 | ||
739 | /* | |
022d91ba | 740 | * Add agent application object to the global hash table. |
f20baf8e | 741 | */ |
022d91ba | 742 | void agent_add_app(struct agent_app *app) |
f20baf8e DG |
743 | { |
744 | assert(app); | |
745 | ||
022d91ba | 746 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
022d91ba | 747 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
748 | } |
749 | ||
f20baf8e | 750 | /* |
022d91ba | 751 | * Delete agent application from the global hash table. |
d558f236 JG |
752 | * |
753 | * rcu_read_lock() must be held by the caller. | |
f20baf8e | 754 | */ |
022d91ba | 755 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
756 | { |
757 | int ret; | |
758 | struct lttng_ht_iter iter; | |
759 | ||
760 | assert(app); | |
761 | ||
022d91ba | 762 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
763 | |
764 | iter.iter.node = &app->node.node; | |
022d91ba | 765 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
f20baf8e DG |
766 | assert(!ret); |
767 | } | |
768 | ||
769 | /* | |
e785906c | 770 | * Destroy an agent application object by detaching it from its corresponding |
022d91ba | 771 | * UST app if one is connected by closing the socket. Finally, perform a |
428de77a | 772 | * delayed memory reclaim. |
f20baf8e | 773 | */ |
022d91ba | 774 | void agent_destroy_app(struct agent_app *app) |
f20baf8e DG |
775 | { |
776 | assert(app); | |
777 | ||
778 | if (app->sock) { | |
779 | app->sock->ops->close(app->sock); | |
780 | lttcomm_destroy_sock(app->sock); | |
781 | } | |
782 | ||
022d91ba | 783 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
784 | } |
785 | ||
0475c50c | 786 | /* |
022d91ba | 787 | * Initialize an already allocated agent object. |
0475c50c DG |
788 | * |
789 | * Return 0 on success or else a negative errno value. | |
790 | */ | |
022d91ba | 791 | int agent_init(struct agent *agt) |
0475c50c DG |
792 | { |
793 | int ret; | |
794 | ||
022d91ba | 795 | assert(agt); |
0475c50c | 796 | |
022d91ba DG |
797 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
798 | if (!agt->events) { | |
0475c50c DG |
799 | ret = -ENOMEM; |
800 | goto error; | |
801 | } | |
fefd409b | 802 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
0475c50c DG |
803 | |
804 | return 0; | |
805 | ||
806 | error: | |
807 | return ret; | |
808 | } | |
809 | ||
fefd409b DG |
810 | /* |
811 | * Add agent object to the given hash table. | |
812 | */ | |
813 | void agent_add(struct agent *agt, struct lttng_ht *ht) | |
814 | { | |
815 | assert(agt); | |
816 | assert(ht); | |
817 | ||
818 | DBG3("Agent adding from domain %d", agt->domain); | |
819 | ||
fefd409b | 820 | lttng_ht_add_unique_u64(ht, &agt->node); |
fefd409b DG |
821 | } |
822 | ||
823 | /* | |
824 | * Create an agent object for the given domain. | |
825 | * | |
826 | * Return the allocated agent or NULL on error. | |
827 | */ | |
828 | struct agent *agent_create(enum lttng_domain_type domain) | |
829 | { | |
830 | int ret; | |
831 | struct agent *agt; | |
832 | ||
3b5f70d4 | 833 | agt = zmalloc(sizeof(struct agent)); |
fefd409b DG |
834 | if (!agt) { |
835 | goto error; | |
836 | } | |
837 | agt->domain = domain; | |
838 | ||
839 | ret = agent_init(agt); | |
840 | if (ret < 0) { | |
841 | free(agt); | |
988ae332 | 842 | agt = NULL; |
fefd409b DG |
843 | goto error; |
844 | } | |
845 | ||
846 | error: | |
847 | return agt; | |
848 | } | |
849 | ||
0475c50c | 850 | /* |
51755dc8 JG |
851 | * Create a newly allocated agent event data structure. |
852 | * Ownership of filter_expression is taken. | |
0475c50c DG |
853 | * |
854 | * Return a new object else NULL on error. | |
855 | */ | |
022d91ba | 856 | struct agent_event *agent_create_event(const char *name, |
a9319624 | 857 | enum lttng_loglevel_type loglevel_type, int loglevel_value, |
51755dc8 | 858 | struct lttng_filter_bytecode *filter, char *filter_expression) |
0475c50c | 859 | { |
51755dc8 | 860 | struct agent_event *event = NULL; |
0475c50c | 861 | |
a9319624 PP |
862 | DBG3("Agent create new event with name %s, loglevel type %d and loglevel value %d", |
863 | name, loglevel_type, loglevel_value); | |
0475c50c | 864 | |
51755dc8 JG |
865 | if (!name) { |
866 | ERR("Failed to create agent event; no name provided."); | |
0475c50c DG |
867 | goto error; |
868 | } | |
869 | ||
51755dc8 JG |
870 | event = zmalloc(sizeof(*event)); |
871 | if (!event) { | |
872 | goto error; | |
0475c50c DG |
873 | } |
874 | ||
51755dc8 JG |
875 | strncpy(event->name, name, sizeof(event->name)); |
876 | event->name[sizeof(event->name) - 1] = '\0'; | |
877 | lttng_ht_node_init_str(&event->node, event->name); | |
be6a6276 | 878 | |
2106efa0 | 879 | event->loglevel_value = loglevel_value; |
51755dc8 JG |
880 | event->loglevel_type = loglevel_type; |
881 | event->filter = filter; | |
882 | event->filter_expression = filter_expression; | |
0475c50c DG |
883 | error: |
884 | return event; | |
885 | } | |
886 | ||
887 | /* | |
022d91ba | 888 | * Unique add of a agent event to an agent object. |
0475c50c | 889 | */ |
022d91ba | 890 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c DG |
891 | { |
892 | assert(event); | |
022d91ba DG |
893 | assert(agt); |
894 | assert(agt->events); | |
0475c50c | 895 | |
022d91ba | 896 | DBG3("Agent adding event %s", event->name); |
022d91ba | 897 | add_unique_agent_event(agt->events, event); |
022d91ba | 898 | agt->being_used = 1; |
0475c50c DG |
899 | } |
900 | ||
901 | /* | |
e261a6cc | 902 | * Find multiple agent events sharing the given name. |
4a4ab2c3 | 903 | * |
e261a6cc PP |
904 | * RCU read side lock MUST be acquired. It must be held for the |
905 | * duration of the iteration. | |
4a4ab2c3 | 906 | * |
e261a6cc | 907 | * Sets the given iterator. |
4a4ab2c3 | 908 | */ |
e261a6cc PP |
909 | void agent_find_events_by_name(const char *name, struct agent *agt, |
910 | struct lttng_ht_iter* iter) | |
4a4ab2c3 | 911 | { |
4a4ab2c3 | 912 | struct lttng_ht *ht; |
022d91ba | 913 | struct agent_ht_key key; |
4a4ab2c3 DG |
914 | |
915 | assert(name); | |
022d91ba DG |
916 | assert(agt); |
917 | assert(agt->events); | |
e261a6cc | 918 | assert(iter); |
4a4ab2c3 | 919 | |
022d91ba | 920 | ht = agt->events; |
4a4ab2c3 DG |
921 | key.name = name; |
922 | ||
923 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
e261a6cc PP |
924 | ht_match_event_by_name, &key, &iter->iter); |
925 | } | |
4a4ab2c3 | 926 | |
e261a6cc PP |
927 | /* |
928 | * Get the next agent event duplicate by name. This should be called | |
929 | * after a call to agent_find_events_by_name() to iterate on events. | |
930 | * | |
931 | * The RCU read lock must be held during the iteration and for as long | |
932 | * as the object the iterator points to remains in use. | |
933 | */ | |
934 | void agent_event_next_duplicate(const char *name, | |
935 | struct agent *agt, struct lttng_ht_iter* iter) | |
936 | { | |
937 | struct agent_ht_key key; | |
4a4ab2c3 | 938 | |
e261a6cc PP |
939 | key.name = name; |
940 | ||
941 | cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name, | |
942 | &key, &iter->iter); | |
4a4ab2c3 DG |
943 | } |
944 | ||
945 | /* | |
022d91ba | 946 | * Find a agent event in the given agent using name and loglevel. |
0475c50c | 947 | * |
1e17eae2 JG |
948 | * RCU read side lock MUST be acquired. It must be kept for as long as |
949 | * the returned agent_event is used. | |
0475c50c DG |
950 | * |
951 | * Return object if found else NULL. | |
952 | */ | |
a9319624 PP |
953 | struct agent_event *agent_find_event(const char *name, |
954 | enum lttng_loglevel_type loglevel_type, int loglevel_value, | |
022d91ba | 955 | struct agent *agt) |
0475c50c DG |
956 | { |
957 | struct lttng_ht_node_str *node; | |
958 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 959 | struct lttng_ht *ht; |
022d91ba | 960 | struct agent_ht_key key; |
0475c50c DG |
961 | |
962 | assert(name); | |
022d91ba DG |
963 | assert(agt); |
964 | assert(agt->events); | |
0475c50c | 965 | |
022d91ba | 966 | ht = agt->events; |
4a4ab2c3 | 967 | key.name = name; |
2106efa0 | 968 | key.loglevel_value = loglevel_value; |
a9319624 | 969 | key.loglevel_type = loglevel_type; |
4a4ab2c3 DG |
970 | |
971 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
972 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
973 | node = lttng_ht_iter_get_node_str(&iter); |
974 | if (node == NULL) { | |
975 | goto error; | |
976 | } | |
977 | ||
022d91ba DG |
978 | DBG3("Agent event found %s.", name); |
979 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
980 | |
981 | error: | |
a51e817b | 982 | DBG3("Agent event NOT found %s.", name); |
0475c50c DG |
983 | return NULL; |
984 | } | |
985 | ||
0475c50c | 986 | /* |
022d91ba DG |
987 | * Free given agent event. This event must not be globally visible at this |
988 | * point (only expected to be used on failure just after event creation). After | |
989 | * this call, the pointer is not usable anymore. | |
0475c50c | 990 | */ |
022d91ba | 991 | void agent_destroy_event(struct agent_event *event) |
0475c50c DG |
992 | { |
993 | assert(event); | |
994 | ||
971da06a | 995 | free(event->filter); |
8404118c | 996 | free(event->filter_expression); |
51755dc8 | 997 | free(event->exclusion); |
0475c50c DG |
998 | free(event); |
999 | } | |
1000 | ||
1001 | /* | |
35ed21a5 | 1002 | * Destroy an agent completely. |
0475c50c | 1003 | */ |
022d91ba | 1004 | void agent_destroy(struct agent *agt) |
0475c50c DG |
1005 | { |
1006 | struct lttng_ht_node_str *node; | |
1007 | struct lttng_ht_iter iter; | |
1008 | ||
022d91ba | 1009 | assert(agt); |
0475c50c | 1010 | |
022d91ba | 1011 | DBG3("Agent destroy"); |
0475c50c | 1012 | |
0475c50c | 1013 | rcu_read_lock(); |
022d91ba | 1014 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 1015 | int ret; |
022d91ba | 1016 | struct agent_event *event; |
29c0fd4d DG |
1017 | |
1018 | /* | |
1019 | * When destroying an event, we have to try to disable it on the agent | |
1020 | * side so the event stops generating data. The return value is not | |
1021 | * important since we have to continue anyway destroying the object. | |
1022 | */ | |
022d91ba DG |
1023 | event = caa_container_of(node, struct agent_event, node); |
1024 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 1025 | |
022d91ba | 1026 | ret = lttng_ht_del(agt->events, &iter); |
0475c50c | 1027 | assert(!ret); |
022d91ba | 1028 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c DG |
1029 | } |
1030 | rcu_read_unlock(); | |
1031 | ||
f8be902b | 1032 | ht_cleanup_push(agt->events); |
35ed21a5 | 1033 | free(agt); |
f20baf8e DG |
1034 | } |
1035 | ||
1036 | /* | |
6a4e4039 | 1037 | * Allocate agent_apps_ht_by_sock. |
f20baf8e | 1038 | */ |
6a4e4039 | 1039 | int agent_app_ht_alloc(void) |
f20baf8e | 1040 | { |
6a4e4039 JG |
1041 | int ret = 0; |
1042 | ||
022d91ba DG |
1043 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1044 | if (!agent_apps_ht_by_sock) { | |
6a4e4039 | 1045 | ret = -1; |
f20baf8e DG |
1046 | } |
1047 | ||
6a4e4039 JG |
1048 | return ret; |
1049 | } | |
1050 | ||
1051 | /* | |
1052 | * Destroy a agent application by socket. | |
1053 | */ | |
1054 | void agent_destroy_app_by_sock(int sock) | |
1055 | { | |
1056 | struct agent_app *app; | |
1057 | ||
1058 | assert(sock >= 0); | |
1059 | ||
1060 | /* | |
1061 | * Not finding an application is a very important error that should NEVER | |
1062 | * happen. The hash table deletion is ONLY done through this call when the | |
1063 | * main sessiond thread is torn down. | |
1064 | */ | |
1065 | rcu_read_lock(); | |
1066 | app = agent_find_app_by_sock(sock); | |
1067 | assert(app); | |
1068 | ||
1069 | /* RCU read side lock is assumed to be held by this function. */ | |
1070 | agent_delete_app(app); | |
1071 | ||
1072 | /* The application is freed in a RCU call but the socket is closed here. */ | |
1073 | agent_destroy_app(app); | |
1074 | rcu_read_unlock(); | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * Clean-up the agent app hash table and destroy it. | |
1079 | */ | |
1080 | void agent_app_ht_clean(void) | |
1081 | { | |
1082 | struct lttng_ht_node_ulong *node; | |
1083 | struct lttng_ht_iter iter; | |
1084 | ||
a433283e JG |
1085 | if (!agent_apps_ht_by_sock) { |
1086 | return; | |
1087 | } | |
6a4e4039 JG |
1088 | rcu_read_lock(); |
1089 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) { | |
1090 | struct agent_app *app; | |
1091 | ||
1092 | app = caa_container_of(node, struct agent_app, node); | |
1093 | agent_destroy_app_by_sock(app->sock->fd); | |
1094 | } | |
1095 | rcu_read_unlock(); | |
1096 | ||
1097 | lttng_ht_destroy(agent_apps_ht_by_sock); | |
f20baf8e DG |
1098 | } |
1099 | ||
1100 | /* | |
022d91ba | 1101 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
1102 | * |
1103 | * Note that this function is most likely to be used with a tracing session | |
1104 | * thus the caller should make sure to hold the appropriate lock(s). | |
1105 | */ | |
022d91ba | 1106 | void agent_update(struct agent *agt, int sock) |
f20baf8e DG |
1107 | { |
1108 | int ret; | |
022d91ba DG |
1109 | struct agent_app *app; |
1110 | struct agent_event *event; | |
f20baf8e DG |
1111 | struct lttng_ht_iter iter; |
1112 | ||
022d91ba | 1113 | assert(agt); |
f20baf8e DG |
1114 | assert(sock >= 0); |
1115 | ||
022d91ba | 1116 | DBG("Agent updating app socket %d", sock); |
f20baf8e DG |
1117 | |
1118 | rcu_read_lock(); | |
022d91ba | 1119 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e DG |
1120 | /* Skip event if disabled. */ |
1121 | if (!event->enabled) { | |
1122 | continue; | |
1123 | } | |
1124 | ||
022d91ba | 1125 | app = agent_find_app_by_sock(sock); |
f20baf8e DG |
1126 | /* |
1127 | * We are in the registration path thus if the application is gone, | |
1128 | * there is a serious code flow error. | |
1129 | */ | |
1130 | assert(app); | |
1131 | ||
1132 | ret = enable_event(app, event); | |
1133 | if (ret != LTTNG_OK) { | |
022d91ba | 1134 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
1135 | event->name, app->pid, app->sock->fd); |
1136 | /* Let's try the others here and don't assume the app is dead. */ | |
1137 | continue; | |
1138 | } | |
1139 | } | |
1140 | rcu_read_unlock(); | |
0475c50c | 1141 | } |