Commit | Line | Data |
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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 | |
6b10b3b0 AM |
129 | /* Filter expression */ |
130 | if (strncmp(event->filter_expression, key->filter_expression, | |
131 | strlen(event->filter_expression)) != 0) { | |
132 | goto no_match; | |
133 | } | |
134 | ||
4a4ab2c3 DG |
135 | return 1; |
136 | ||
137 | no_match: | |
138 | return 0; | |
139 | } | |
140 | ||
141 | /* | |
022d91ba | 142 | * Add unique agent event based on the event name and loglevel. |
4a4ab2c3 | 143 | */ |
022d91ba DG |
144 | static void add_unique_agent_event(struct lttng_ht *ht, |
145 | struct agent_event *event) | |
4a4ab2c3 DG |
146 | { |
147 | struct cds_lfht_node *node_ptr; | |
022d91ba | 148 | struct agent_ht_key key; |
4a4ab2c3 DG |
149 | |
150 | assert(ht); | |
151 | assert(ht->ht); | |
152 | assert(event); | |
153 | ||
154 | key.name = event->name; | |
2106efa0 | 155 | key.loglevel_value = event->loglevel_value; |
a9319624 | 156 | key.loglevel_type = event->loglevel_type; |
6b10b3b0 | 157 | key.filter_expression = event->filter_expression; |
4a4ab2c3 DG |
158 | |
159 | node_ptr = cds_lfht_add_unique(ht->ht, | |
160 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
161 | ht_match_event, &key, &event->node.node); | |
162 | assert(node_ptr == &event->node.node); | |
163 | } | |
164 | ||
0475c50c | 165 | /* |
022d91ba | 166 | * URCU delayed agent event reclaim. |
0475c50c | 167 | */ |
022d91ba | 168 | static void destroy_event_agent_rcu(struct rcu_head *head) |
0475c50c DG |
169 | { |
170 | struct lttng_ht_node_str *node = | |
171 | caa_container_of(head, struct lttng_ht_node_str, head); | |
022d91ba DG |
172 | struct agent_event *event = |
173 | caa_container_of(node, struct agent_event, node); | |
0475c50c | 174 | |
992febc7 | 175 | agent_destroy_event(event); |
0475c50c DG |
176 | } |
177 | ||
f20baf8e | 178 | /* |
022d91ba | 179 | * URCU delayed agent app reclaim. |
f20baf8e | 180 | */ |
022d91ba | 181 | static void destroy_app_agent_rcu(struct rcu_head *head) |
f20baf8e DG |
182 | { |
183 | struct lttng_ht_node_ulong *node = | |
184 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
022d91ba DG |
185 | struct agent_app *app = |
186 | caa_container_of(node, struct agent_app, node); | |
f20baf8e DG |
187 | |
188 | free(app); | |
189 | } | |
190 | ||
191 | /* | |
022d91ba DG |
192 | * Communication with the agent. Send the message header to the given socket in |
193 | * big endian. | |
f20baf8e DG |
194 | * |
195 | * Return 0 on success or else a negative errno message of sendmsg() op. | |
196 | */ | |
197 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, | |
198 | uint32_t cmd, uint32_t cmd_version) | |
199 | { | |
200 | int ret; | |
201 | ssize_t size; | |
022d91ba | 202 | struct lttcomm_agent_hdr msg; |
f20baf8e DG |
203 | |
204 | assert(sock); | |
205 | ||
53efb85a | 206 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
207 | msg.data_size = htobe64(data_size); |
208 | msg.cmd = htobe32(cmd); | |
209 | msg.cmd_version = htobe32(cmd_version); | |
210 | ||
211 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
212 | if (size < sizeof(msg)) { | |
213 | ret = -errno; | |
214 | goto error; | |
215 | } | |
216 | ret = 0; | |
217 | ||
218 | error: | |
219 | return ret; | |
220 | } | |
221 | ||
222 | /* | |
022d91ba DG |
223 | * Communication call with the agent. Send the payload to the given socket. The |
224 | * header MUST be sent prior to this call. | |
f20baf8e DG |
225 | * |
226 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
227 | */ | |
228 | static int send_payload(struct lttcomm_sock *sock, void *data, | |
229 | size_t size) | |
230 | { | |
231 | int ret; | |
232 | ssize_t len; | |
233 | ||
234 | assert(sock); | |
235 | assert(data); | |
236 | ||
237 | len = sock->ops->sendmsg(sock, data, size, 0); | |
238 | if (len < size) { | |
239 | ret = -errno; | |
240 | goto error; | |
241 | } | |
242 | ret = 0; | |
243 | ||
244 | error: | |
245 | return ret; | |
246 | } | |
247 | ||
248 | /* | |
022d91ba DG |
249 | * Communication call with the agent. Receive reply from the agent using the |
250 | * given socket. | |
f20baf8e DG |
251 | * |
252 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
253 | */ | |
254 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
255 | { | |
256 | int ret; | |
257 | ssize_t len; | |
258 | ||
259 | assert(sock); | |
260 | assert(buf); | |
261 | ||
262 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
263 | if (len < size) { | |
264 | ret = -errno; | |
265 | goto error; | |
266 | } | |
267 | ret = 0; | |
268 | ||
269 | error: | |
270 | return ret; | |
271 | } | |
272 | ||
3c6a091f | 273 | /* |
428de77a | 274 | * Internal event listing for a given app. Populate events. |
3c6a091f DG |
275 | * |
276 | * Return number of element in the list or else a negative LTTNG_ERR* code. | |
428de77a MD |
277 | * On success, the caller is responsible for freeing the memory |
278 | * allocated for "events". | |
3c6a091f | 279 | */ |
022d91ba | 280 | static ssize_t list_events(struct agent_app *app, struct lttng_event **events) |
3c6a091f DG |
281 | { |
282 | int ret, i, len = 0, offset = 0; | |
283 | uint32_t nb_event; | |
284 | size_t data_size; | |
d84af1a4 | 285 | uint32_t reply_ret_code; |
3c6a091f | 286 | struct lttng_event *tmp_events = NULL; |
022d91ba DG |
287 | struct lttcomm_agent_list_reply *reply = NULL; |
288 | struct lttcomm_agent_list_reply_hdr reply_hdr; | |
3c6a091f DG |
289 | |
290 | assert(app); | |
291 | assert(app->sock); | |
292 | assert(events); | |
293 | ||
022d91ba | 294 | DBG2("Agent listing events for app pid: %d and socket %d", app->pid, |
3c6a091f DG |
295 | app->sock->fd); |
296 | ||
022d91ba | 297 | ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0); |
3c6a091f DG |
298 | if (ret < 0) { |
299 | goto error_io; | |
300 | } | |
301 | ||
302 | /* Get list header so we know how much we'll receive. */ | |
303 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); | |
304 | if (ret < 0) { | |
305 | goto error_io; | |
306 | } | |
307 | ||
d84af1a4 JG |
308 | reply_ret_code = be32toh(reply_hdr.ret_code); |
309 | log_reply_code(reply_ret_code); | |
310 | switch (reply_ret_code) { | |
022d91ba | 311 | case AGENT_RET_CODE_SUCCESS: |
3c6a091f DG |
312 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
313 | break; | |
314 | default: | |
3bd9aaeb | 315 | ret = LTTNG_ERR_UNK; |
3c6a091f DG |
316 | goto error; |
317 | } | |
318 | ||
319 | reply = zmalloc(data_size); | |
320 | if (!reply) { | |
321 | ret = LTTNG_ERR_NOMEM; | |
322 | goto error; | |
323 | } | |
324 | ||
325 | /* Get the list with the appropriate data size. */ | |
326 | ret = recv_reply(app->sock, reply, data_size); | |
327 | if (ret < 0) { | |
328 | goto error_io; | |
329 | } | |
330 | ||
331 | nb_event = be32toh(reply->nb_event); | |
332 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); | |
333 | if (!tmp_events) { | |
334 | ret = LTTNG_ERR_NOMEM; | |
335 | goto error; | |
336 | } | |
337 | ||
338 | for (i = 0; i < nb_event; i++) { | |
339 | offset += len; | |
340 | strncpy(tmp_events[i].name, reply->payload + offset, | |
341 | sizeof(tmp_events[i].name)); | |
342 | tmp_events[i].pid = app->pid; | |
343 | tmp_events[i].enabled = -1; | |
344 | len = strlen(reply->payload + offset) + 1; | |
345 | } | |
346 | ||
347 | *events = tmp_events; | |
348 | ||
349 | free(reply); | |
350 | return nb_event; | |
351 | ||
352 | error_io: | |
353 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
354 | error: | |
355 | free(reply); | |
356 | free(tmp_events); | |
357 | return -ret; | |
358 | ||
359 | } | |
360 | ||
f20baf8e | 361 | /* |
022d91ba DG |
362 | * Internal enable agent event on a agent application. This function |
363 | * communicates with the agent to enable a given event. | |
f20baf8e DG |
364 | * |
365 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
366 | */ | |
022d91ba | 367 | static int enable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
368 | { |
369 | int ret; | |
a0ba721c | 370 | char *bytes_to_send; |
f20baf8e | 371 | uint64_t data_size; |
a0ba721c | 372 | size_t filter_expression_length; |
f4f9d4db | 373 | uint32_t reply_ret_code; |
022d91ba DG |
374 | struct lttcomm_agent_enable msg; |
375 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
376 | |
377 | assert(app); | |
378 | assert(app->sock); | |
379 | assert(event); | |
380 | ||
022d91ba | 381 | DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
382 | app->pid, app->sock->fd); |
383 | ||
a0ba721c AM |
384 | /* |
385 | * Calculate the payload's size, which is the fixed-size struct followed | |
386 | * by the variable-length filter expression (+1 for the ending \0). | |
387 | */ | |
388 | if (!event->filter_expression) { | |
389 | filter_expression_length = 0; | |
390 | } else { | |
391 | filter_expression_length = strlen(event->filter_expression) + 1; | |
392 | } | |
393 | data_size = sizeof(msg) + filter_expression_length; | |
f20baf8e | 394 | |
022d91ba | 395 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
f20baf8e DG |
396 | if (ret < 0) { |
397 | goto error_io; | |
398 | } | |
399 | ||
53efb85a | 400 | memset(&msg, 0, sizeof(msg)); |
a9bfd666 JG |
401 | msg.loglevel_value = htobe32(event->loglevel_value); |
402 | msg.loglevel_type = htobe32(event->loglevel_type); | |
f20baf8e | 403 | strncpy(msg.name, event->name, sizeof(msg.name)); |
a9bfd666 | 404 | msg.filter_expression_length = htobe32(filter_expression_length); |
a0ba721c AM |
405 | |
406 | bytes_to_send = zmalloc(data_size); | |
407 | if (!bytes_to_send) { | |
408 | ret = LTTNG_ERR_NOMEM; | |
409 | goto error; | |
410 | } | |
411 | ||
412 | memcpy(bytes_to_send, &msg, sizeof(msg)); | |
413 | if (filter_expression_length > 0) { | |
414 | memcpy(bytes_to_send + sizeof(msg), event->filter_expression, | |
415 | filter_expression_length); | |
416 | } | |
417 | ||
418 | ret = send_payload(app->sock, bytes_to_send, data_size); | |
419 | free(bytes_to_send); | |
f20baf8e DG |
420 | if (ret < 0) { |
421 | goto error_io; | |
422 | } | |
423 | ||
424 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
425 | if (ret < 0) { | |
426 | goto error_io; | |
427 | } | |
428 | ||
f4f9d4db JG |
429 | reply_ret_code = be32toh(reply.ret_code); |
430 | log_reply_code(reply_ret_code); | |
431 | switch (reply_ret_code) { | |
022d91ba | 432 | case AGENT_RET_CODE_SUCCESS: |
f20baf8e | 433 | break; |
022d91ba | 434 | case AGENT_RET_CODE_UNKNOWN_NAME: |
f20baf8e DG |
435 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
436 | goto error; | |
437 | default: | |
3bd9aaeb | 438 | ret = LTTNG_ERR_UNK; |
f20baf8e DG |
439 | goto error; |
440 | } | |
441 | ||
442 | return LTTNG_OK; | |
443 | ||
444 | error_io: | |
445 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
446 | error: | |
447 | return ret; | |
448 | } | |
449 | ||
450 | /* | |
022d91ba DG |
451 | * Internal disable agent event call on a agent application. This function |
452 | * communicates with the agent to disable a given event. | |
f20baf8e DG |
453 | * |
454 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
455 | */ | |
022d91ba | 456 | static int disable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
457 | { |
458 | int ret; | |
459 | uint64_t data_size; | |
517992f8 | 460 | uint32_t reply_ret_code; |
022d91ba DG |
461 | struct lttcomm_agent_disable msg; |
462 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
463 | |
464 | assert(app); | |
465 | assert(app->sock); | |
466 | assert(event); | |
467 | ||
022d91ba | 468 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
469 | app->pid, app->sock->fd); |
470 | ||
471 | data_size = sizeof(msg); | |
472 | ||
022d91ba | 473 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
f20baf8e DG |
474 | if (ret < 0) { |
475 | goto error_io; | |
476 | } | |
477 | ||
53efb85a | 478 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
479 | strncpy(msg.name, event->name, sizeof(msg.name)); |
480 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
481 | if (ret < 0) { | |
482 | goto error_io; | |
483 | } | |
484 | ||
485 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
486 | if (ret < 0) { | |
487 | goto error_io; | |
488 | } | |
489 | ||
517992f8 JG |
490 | reply_ret_code = be32toh(reply.ret_code); |
491 | log_reply_code(reply_ret_code); | |
492 | switch (reply_ret_code) { | |
022d91ba DG |
493 | case AGENT_RET_CODE_SUCCESS: |
494 | break; | |
495 | case AGENT_RET_CODE_UNKNOWN_NAME: | |
496 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
497 | goto error; | |
498 | default: | |
3bd9aaeb | 499 | ret = LTTNG_ERR_UNK; |
022d91ba | 500 | goto error; |
f20baf8e DG |
501 | } |
502 | ||
503 | return LTTNG_OK; | |
504 | ||
505 | error_io: | |
506 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
507 | error: | |
508 | return ret; | |
509 | } | |
510 | ||
1b500e7a | 511 | /* |
022d91ba | 512 | * Send back the registration DONE command to a given agent application. |
1b500e7a DG |
513 | * |
514 | * Return 0 on success or else a negative value. | |
515 | */ | |
022d91ba | 516 | int agent_send_registration_done(struct agent_app *app) |
1b500e7a DG |
517 | { |
518 | assert(app); | |
519 | assert(app->sock); | |
520 | ||
022d91ba | 521 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
1b500e7a | 522 | |
b26d1f5c | 523 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0); |
1b500e7a DG |
524 | } |
525 | ||
f20baf8e | 526 | /* |
022d91ba | 527 | * Enable agent event on every agent applications registered with the session |
f20baf8e DG |
528 | * daemon. |
529 | * | |
530 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
531 | */ | |
fefd409b DG |
532 | int agent_enable_event(struct agent_event *event, |
533 | enum lttng_domain_type domain) | |
f20baf8e DG |
534 | { |
535 | int ret; | |
022d91ba | 536 | struct agent_app *app; |
f20baf8e DG |
537 | struct lttng_ht_iter iter; |
538 | ||
539 | assert(event); | |
540 | ||
541 | rcu_read_lock(); | |
542 | ||
022d91ba | 543 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 544 | node.node) { |
fefd409b DG |
545 | if (app->domain != domain) { |
546 | continue; | |
547 | } | |
548 | ||
022d91ba | 549 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
550 | ret = enable_event(app, event); |
551 | if (ret != LTTNG_OK) { | |
552 | goto error; | |
553 | } | |
f20baf8e DG |
554 | } |
555 | ||
3c6a091f | 556 | event->enabled = 1; |
f20baf8e DG |
557 | ret = LTTNG_OK; |
558 | ||
559 | error: | |
560 | rcu_read_unlock(); | |
561 | return ret; | |
562 | } | |
563 | ||
564 | /* | |
022d91ba | 565 | * Disable agent event on every agent applications registered with the session |
f20baf8e DG |
566 | * daemon. |
567 | * | |
568 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
569 | */ | |
fefd409b DG |
570 | int agent_disable_event(struct agent_event *event, |
571 | enum lttng_domain_type domain) | |
f20baf8e | 572 | { |
f1bc0129 | 573 | int ret = LTTNG_OK; |
022d91ba | 574 | struct agent_app *app; |
f20baf8e DG |
575 | struct lttng_ht_iter iter; |
576 | ||
577 | assert(event); | |
f1bc0129 JG |
578 | if (!event->enabled) { |
579 | goto end; | |
580 | } | |
f20baf8e DG |
581 | |
582 | rcu_read_lock(); | |
583 | ||
022d91ba | 584 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 585 | node.node) { |
fefd409b DG |
586 | if (app->domain != domain) { |
587 | continue; | |
588 | } | |
589 | ||
022d91ba | 590 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
591 | ret = disable_event(app, event); |
592 | if (ret != LTTNG_OK) { | |
593 | goto error; | |
594 | } | |
f20baf8e DG |
595 | } |
596 | ||
3c6a091f | 597 | event->enabled = 0; |
f20baf8e DG |
598 | |
599 | error: | |
600 | rcu_read_unlock(); | |
f1bc0129 | 601 | end: |
f20baf8e DG |
602 | return ret; |
603 | } | |
604 | ||
605 | /* | |
022d91ba DG |
606 | * Ask every agent for the list of possible event. Events is allocated with the |
607 | * events of every agent application. | |
f20baf8e DG |
608 | * |
609 | * Return the number of events or else a negative value. | |
610 | */ | |
f60140a1 DG |
611 | int agent_list_events(struct lttng_event **events, |
612 | enum lttng_domain_type domain) | |
f20baf8e DG |
613 | { |
614 | int ret; | |
615 | size_t nbmem, count = 0; | |
022d91ba | 616 | struct agent_app *app; |
aae6255e | 617 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
618 | struct lttng_ht_iter iter; |
619 | ||
620 | assert(events); | |
621 | ||
0e115563 DG |
622 | DBG2("Agent listing events for domain %d", domain); |
623 | ||
f20baf8e DG |
624 | nbmem = UST_APP_EVENT_LIST_SIZE; |
625 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
626 | if (!tmp_events) { | |
022d91ba | 627 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
628 | ret = -ENOMEM; |
629 | goto error; | |
630 | } | |
631 | ||
632 | rcu_read_lock(); | |
022d91ba | 633 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
634 | node.node) { |
635 | ssize_t nb_ev; | |
022d91ba | 636 | struct lttng_event *agent_events; |
f20baf8e | 637 | |
f60140a1 DG |
638 | /* Skip domain not asked by the list. */ |
639 | if (app->domain != domain) { | |
640 | continue; | |
641 | } | |
642 | ||
022d91ba | 643 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
644 | if (nb_ev < 0) { |
645 | ret = nb_ev; | |
428de77a | 646 | goto error_unlock; |
f20baf8e DG |
647 | } |
648 | ||
53efb85a | 649 | if (count + nb_ev > nbmem) { |
f20baf8e | 650 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
651 | struct lttng_event *new_tmp_events; |
652 | size_t new_nbmem; | |
653 | ||
654 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 655 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
656 | nbmem, new_nbmem); |
657 | new_tmp_events = realloc(tmp_events, | |
658 | new_nbmem * sizeof(*new_tmp_events)); | |
659 | if (!new_tmp_events) { | |
022d91ba | 660 | PERROR("realloc agent events"); |
f20baf8e | 661 | ret = -ENOMEM; |
022d91ba | 662 | free(agent_events); |
428de77a | 663 | goto error_unlock; |
f20baf8e | 664 | } |
53efb85a MD |
665 | /* Zero the new memory */ |
666 | memset(new_tmp_events + nbmem, 0, | |
667 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
668 | nbmem = new_nbmem; | |
669 | tmp_events = new_tmp_events; | |
f20baf8e | 670 | } |
022d91ba | 671 | memcpy(tmp_events + count, agent_events, |
53efb85a | 672 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 673 | free(agent_events); |
f20baf8e DG |
674 | count += nb_ev; |
675 | } | |
676 | rcu_read_unlock(); | |
677 | ||
678 | ret = count; | |
679 | *events = tmp_events; | |
aae6255e | 680 | return ret; |
f20baf8e | 681 | |
428de77a MD |
682 | error_unlock: |
683 | rcu_read_unlock(); | |
f20baf8e | 684 | error: |
aae6255e | 685 | free(tmp_events); |
f20baf8e DG |
686 | return ret; |
687 | } | |
688 | ||
689 | /* | |
022d91ba | 690 | * Create a agent app object using the given PID. |
f20baf8e DG |
691 | * |
692 | * Return newly allocated object or else NULL on error. | |
693 | */ | |
fefd409b DG |
694 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
695 | struct lttcomm_sock *sock) | |
f20baf8e | 696 | { |
022d91ba | 697 | struct agent_app *app; |
f20baf8e DG |
698 | |
699 | assert(sock); | |
700 | ||
701 | app = zmalloc(sizeof(*app)); | |
702 | if (!app) { | |
022d91ba | 703 | PERROR("zmalloc agent create"); |
f20baf8e DG |
704 | goto error; |
705 | } | |
706 | ||
707 | app->pid = pid; | |
fefd409b | 708 | app->domain = domain; |
f20baf8e | 709 | app->sock = sock; |
f20baf8e DG |
710 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
711 | ||
712 | error: | |
713 | return app; | |
714 | } | |
715 | ||
716 | /* | |
022d91ba | 717 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
718 | * |
719 | * RCU read side lock MUST be acquired. | |
720 | * | |
721 | * Return object if found else NULL. | |
722 | */ | |
022d91ba | 723 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
724 | { |
725 | struct lttng_ht_node_ulong *node; | |
726 | struct lttng_ht_iter iter; | |
022d91ba | 727 | struct agent_app *app; |
f20baf8e DG |
728 | |
729 | assert(sock >= 0); | |
730 | ||
022d91ba | 731 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
f20baf8e DG |
732 | node = lttng_ht_iter_get_node_ulong(&iter); |
733 | if (node == NULL) { | |
734 | goto error; | |
735 | } | |
022d91ba | 736 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 737 | |
022d91ba | 738 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
739 | return app; |
740 | ||
741 | error: | |
022d91ba | 742 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
743 | return NULL; |
744 | } | |
745 | ||
746 | /* | |
022d91ba | 747 | * Add agent application object to the global hash table. |
f20baf8e | 748 | */ |
022d91ba | 749 | void agent_add_app(struct agent_app *app) |
f20baf8e DG |
750 | { |
751 | assert(app); | |
752 | ||
022d91ba | 753 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
022d91ba | 754 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
755 | } |
756 | ||
f20baf8e | 757 | /* |
022d91ba | 758 | * Delete agent application from the global hash table. |
d558f236 JG |
759 | * |
760 | * rcu_read_lock() must be held by the caller. | |
f20baf8e | 761 | */ |
022d91ba | 762 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
763 | { |
764 | int ret; | |
765 | struct lttng_ht_iter iter; | |
766 | ||
767 | assert(app); | |
768 | ||
022d91ba | 769 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
770 | |
771 | iter.iter.node = &app->node.node; | |
022d91ba | 772 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
f20baf8e DG |
773 | assert(!ret); |
774 | } | |
775 | ||
776 | /* | |
e785906c | 777 | * Destroy an agent application object by detaching it from its corresponding |
022d91ba | 778 | * UST app if one is connected by closing the socket. Finally, perform a |
428de77a | 779 | * delayed memory reclaim. |
f20baf8e | 780 | */ |
022d91ba | 781 | void agent_destroy_app(struct agent_app *app) |
f20baf8e DG |
782 | { |
783 | assert(app); | |
784 | ||
785 | if (app->sock) { | |
786 | app->sock->ops->close(app->sock); | |
787 | lttcomm_destroy_sock(app->sock); | |
788 | } | |
789 | ||
022d91ba | 790 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
791 | } |
792 | ||
0475c50c | 793 | /* |
022d91ba | 794 | * Initialize an already allocated agent object. |
0475c50c DG |
795 | * |
796 | * Return 0 on success or else a negative errno value. | |
797 | */ | |
022d91ba | 798 | int agent_init(struct agent *agt) |
0475c50c DG |
799 | { |
800 | int ret; | |
801 | ||
022d91ba | 802 | assert(agt); |
0475c50c | 803 | |
022d91ba DG |
804 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
805 | if (!agt->events) { | |
0475c50c DG |
806 | ret = -ENOMEM; |
807 | goto error; | |
808 | } | |
fefd409b | 809 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
0475c50c DG |
810 | |
811 | return 0; | |
812 | ||
813 | error: | |
814 | return ret; | |
815 | } | |
816 | ||
fefd409b DG |
817 | /* |
818 | * Add agent object to the given hash table. | |
819 | */ | |
820 | void agent_add(struct agent *agt, struct lttng_ht *ht) | |
821 | { | |
822 | assert(agt); | |
823 | assert(ht); | |
824 | ||
825 | DBG3("Agent adding from domain %d", agt->domain); | |
826 | ||
fefd409b | 827 | lttng_ht_add_unique_u64(ht, &agt->node); |
fefd409b DG |
828 | } |
829 | ||
830 | /* | |
831 | * Create an agent object for the given domain. | |
832 | * | |
833 | * Return the allocated agent or NULL on error. | |
834 | */ | |
835 | struct agent *agent_create(enum lttng_domain_type domain) | |
836 | { | |
837 | int ret; | |
838 | struct agent *agt; | |
839 | ||
3b5f70d4 | 840 | agt = zmalloc(sizeof(struct agent)); |
fefd409b DG |
841 | if (!agt) { |
842 | goto error; | |
843 | } | |
844 | agt->domain = domain; | |
845 | ||
846 | ret = agent_init(agt); | |
847 | if (ret < 0) { | |
848 | free(agt); | |
988ae332 | 849 | agt = NULL; |
fefd409b DG |
850 | goto error; |
851 | } | |
852 | ||
853 | error: | |
854 | return agt; | |
855 | } | |
856 | ||
0475c50c | 857 | /* |
51755dc8 JG |
858 | * Create a newly allocated agent event data structure. |
859 | * Ownership of filter_expression is taken. | |
0475c50c DG |
860 | * |
861 | * Return a new object else NULL on error. | |
862 | */ | |
022d91ba | 863 | struct agent_event *agent_create_event(const char *name, |
a9319624 | 864 | enum lttng_loglevel_type loglevel_type, int loglevel_value, |
51755dc8 | 865 | struct lttng_filter_bytecode *filter, char *filter_expression) |
0475c50c | 866 | { |
51755dc8 | 867 | struct agent_event *event = NULL; |
0475c50c | 868 | |
6b10b3b0 AM |
869 | DBG3("Agent create new event with name %s, loglevel type %d, \ |
870 | loglevel value %d and filter %s", | |
40111ba1 JG |
871 | name, loglevel_type, loglevel_value, |
872 | filter_expression ? filter_expression : "NULL"); | |
0475c50c | 873 | |
51755dc8 JG |
874 | if (!name) { |
875 | ERR("Failed to create agent event; no name provided."); | |
0475c50c DG |
876 | goto error; |
877 | } | |
878 | ||
51755dc8 JG |
879 | event = zmalloc(sizeof(*event)); |
880 | if (!event) { | |
881 | goto error; | |
0475c50c DG |
882 | } |
883 | ||
51755dc8 JG |
884 | strncpy(event->name, name, sizeof(event->name)); |
885 | event->name[sizeof(event->name) - 1] = '\0'; | |
886 | lttng_ht_node_init_str(&event->node, event->name); | |
be6a6276 | 887 | |
2106efa0 | 888 | event->loglevel_value = loglevel_value; |
51755dc8 JG |
889 | event->loglevel_type = loglevel_type; |
890 | event->filter = filter; | |
891 | event->filter_expression = filter_expression; | |
0475c50c DG |
892 | error: |
893 | return event; | |
894 | } | |
895 | ||
896 | /* | |
022d91ba | 897 | * Unique add of a agent event to an agent object. |
0475c50c | 898 | */ |
022d91ba | 899 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c DG |
900 | { |
901 | assert(event); | |
022d91ba DG |
902 | assert(agt); |
903 | assert(agt->events); | |
0475c50c | 904 | |
022d91ba | 905 | DBG3("Agent adding event %s", event->name); |
022d91ba | 906 | add_unique_agent_event(agt->events, event); |
022d91ba | 907 | agt->being_used = 1; |
0475c50c DG |
908 | } |
909 | ||
910 | /* | |
e261a6cc | 911 | * Find multiple agent events sharing the given name. |
4a4ab2c3 | 912 | * |
e261a6cc PP |
913 | * RCU read side lock MUST be acquired. It must be held for the |
914 | * duration of the iteration. | |
4a4ab2c3 | 915 | * |
e261a6cc | 916 | * Sets the given iterator. |
4a4ab2c3 | 917 | */ |
e261a6cc PP |
918 | void agent_find_events_by_name(const char *name, struct agent *agt, |
919 | struct lttng_ht_iter* iter) | |
4a4ab2c3 | 920 | { |
4a4ab2c3 | 921 | struct lttng_ht *ht; |
022d91ba | 922 | struct agent_ht_key key; |
4a4ab2c3 DG |
923 | |
924 | assert(name); | |
022d91ba DG |
925 | assert(agt); |
926 | assert(agt->events); | |
e261a6cc | 927 | assert(iter); |
4a4ab2c3 | 928 | |
022d91ba | 929 | ht = agt->events; |
4a4ab2c3 DG |
930 | key.name = name; |
931 | ||
932 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
e261a6cc PP |
933 | ht_match_event_by_name, &key, &iter->iter); |
934 | } | |
4a4ab2c3 | 935 | |
e261a6cc PP |
936 | /* |
937 | * Get the next agent event duplicate by name. This should be called | |
938 | * after a call to agent_find_events_by_name() to iterate on events. | |
939 | * | |
940 | * The RCU read lock must be held during the iteration and for as long | |
941 | * as the object the iterator points to remains in use. | |
942 | */ | |
943 | void agent_event_next_duplicate(const char *name, | |
944 | struct agent *agt, struct lttng_ht_iter* iter) | |
945 | { | |
946 | struct agent_ht_key key; | |
4a4ab2c3 | 947 | |
e261a6cc PP |
948 | key.name = name; |
949 | ||
950 | cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name, | |
951 | &key, &iter->iter); | |
4a4ab2c3 DG |
952 | } |
953 | ||
954 | /* | |
6b10b3b0 | 955 | * Find a agent event in the given agent using name, loglevel and filter. |
0475c50c | 956 | * |
1e17eae2 JG |
957 | * RCU read side lock MUST be acquired. It must be kept for as long as |
958 | * the returned agent_event is used. | |
0475c50c DG |
959 | * |
960 | * Return object if found else NULL. | |
961 | */ | |
a9319624 PP |
962 | struct agent_event *agent_find_event(const char *name, |
963 | enum lttng_loglevel_type loglevel_type, int loglevel_value, | |
6b10b3b0 | 964 | char *filter_expression, struct agent *agt) |
0475c50c DG |
965 | { |
966 | struct lttng_ht_node_str *node; | |
967 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 968 | struct lttng_ht *ht; |
022d91ba | 969 | struct agent_ht_key key; |
0475c50c DG |
970 | |
971 | assert(name); | |
022d91ba DG |
972 | assert(agt); |
973 | assert(agt->events); | |
0475c50c | 974 | |
022d91ba | 975 | ht = agt->events; |
4a4ab2c3 | 976 | key.name = name; |
2106efa0 | 977 | key.loglevel_value = loglevel_value; |
a9319624 | 978 | key.loglevel_type = loglevel_type; |
6b10b3b0 | 979 | key.filter_expression = filter_expression; |
4a4ab2c3 DG |
980 | |
981 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
982 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
983 | node = lttng_ht_iter_get_node_str(&iter); |
984 | if (node == NULL) { | |
985 | goto error; | |
986 | } | |
987 | ||
022d91ba DG |
988 | DBG3("Agent event found %s.", name); |
989 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
990 | |
991 | error: | |
a51e817b | 992 | DBG3("Agent event NOT found %s.", name); |
0475c50c DG |
993 | return NULL; |
994 | } | |
995 | ||
0475c50c | 996 | /* |
022d91ba DG |
997 | * Free given agent event. This event must not be globally visible at this |
998 | * point (only expected to be used on failure just after event creation). After | |
999 | * this call, the pointer is not usable anymore. | |
0475c50c | 1000 | */ |
022d91ba | 1001 | void agent_destroy_event(struct agent_event *event) |
0475c50c DG |
1002 | { |
1003 | assert(event); | |
1004 | ||
971da06a | 1005 | free(event->filter); |
8404118c | 1006 | free(event->filter_expression); |
51755dc8 | 1007 | free(event->exclusion); |
0475c50c DG |
1008 | free(event); |
1009 | } | |
1010 | ||
1011 | /* | |
35ed21a5 | 1012 | * Destroy an agent completely. |
0475c50c | 1013 | */ |
022d91ba | 1014 | void agent_destroy(struct agent *agt) |
0475c50c DG |
1015 | { |
1016 | struct lttng_ht_node_str *node; | |
1017 | struct lttng_ht_iter iter; | |
1018 | ||
022d91ba | 1019 | assert(agt); |
0475c50c | 1020 | |
022d91ba | 1021 | DBG3("Agent destroy"); |
0475c50c | 1022 | |
0475c50c | 1023 | rcu_read_lock(); |
022d91ba | 1024 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 1025 | int ret; |
022d91ba | 1026 | struct agent_event *event; |
29c0fd4d DG |
1027 | |
1028 | /* | |
1029 | * When destroying an event, we have to try to disable it on the agent | |
1030 | * side so the event stops generating data. The return value is not | |
1031 | * important since we have to continue anyway destroying the object. | |
1032 | */ | |
022d91ba DG |
1033 | event = caa_container_of(node, struct agent_event, node); |
1034 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 1035 | |
022d91ba | 1036 | ret = lttng_ht_del(agt->events, &iter); |
0475c50c | 1037 | assert(!ret); |
022d91ba | 1038 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c DG |
1039 | } |
1040 | rcu_read_unlock(); | |
1041 | ||
f8be902b | 1042 | ht_cleanup_push(agt->events); |
35ed21a5 | 1043 | free(agt); |
f20baf8e DG |
1044 | } |
1045 | ||
1046 | /* | |
6a4e4039 | 1047 | * Allocate agent_apps_ht_by_sock. |
f20baf8e | 1048 | */ |
6a4e4039 | 1049 | int agent_app_ht_alloc(void) |
f20baf8e | 1050 | { |
6a4e4039 JG |
1051 | int ret = 0; |
1052 | ||
022d91ba DG |
1053 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1054 | if (!agent_apps_ht_by_sock) { | |
6a4e4039 | 1055 | ret = -1; |
f20baf8e DG |
1056 | } |
1057 | ||
6a4e4039 JG |
1058 | return ret; |
1059 | } | |
1060 | ||
1061 | /* | |
1062 | * Destroy a agent application by socket. | |
1063 | */ | |
1064 | void agent_destroy_app_by_sock(int sock) | |
1065 | { | |
1066 | struct agent_app *app; | |
1067 | ||
1068 | assert(sock >= 0); | |
1069 | ||
1070 | /* | |
1071 | * Not finding an application is a very important error that should NEVER | |
1072 | * happen. The hash table deletion is ONLY done through this call when the | |
1073 | * main sessiond thread is torn down. | |
1074 | */ | |
1075 | rcu_read_lock(); | |
1076 | app = agent_find_app_by_sock(sock); | |
1077 | assert(app); | |
1078 | ||
1079 | /* RCU read side lock is assumed to be held by this function. */ | |
1080 | agent_delete_app(app); | |
1081 | ||
1082 | /* The application is freed in a RCU call but the socket is closed here. */ | |
1083 | agent_destroy_app(app); | |
1084 | rcu_read_unlock(); | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * Clean-up the agent app hash table and destroy it. | |
1089 | */ | |
1090 | void agent_app_ht_clean(void) | |
1091 | { | |
1092 | struct lttng_ht_node_ulong *node; | |
1093 | struct lttng_ht_iter iter; | |
1094 | ||
a433283e JG |
1095 | if (!agent_apps_ht_by_sock) { |
1096 | return; | |
1097 | } | |
6a4e4039 JG |
1098 | rcu_read_lock(); |
1099 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) { | |
1100 | struct agent_app *app; | |
1101 | ||
1102 | app = caa_container_of(node, struct agent_app, node); | |
1103 | agent_destroy_app_by_sock(app->sock->fd); | |
1104 | } | |
1105 | rcu_read_unlock(); | |
1106 | ||
1107 | lttng_ht_destroy(agent_apps_ht_by_sock); | |
f20baf8e DG |
1108 | } |
1109 | ||
1110 | /* | |
022d91ba | 1111 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
1112 | * |
1113 | * Note that this function is most likely to be used with a tracing session | |
1114 | * thus the caller should make sure to hold the appropriate lock(s). | |
1115 | */ | |
022d91ba | 1116 | void agent_update(struct agent *agt, int sock) |
f20baf8e DG |
1117 | { |
1118 | int ret; | |
022d91ba DG |
1119 | struct agent_app *app; |
1120 | struct agent_event *event; | |
f20baf8e DG |
1121 | struct lttng_ht_iter iter; |
1122 | ||
022d91ba | 1123 | assert(agt); |
f20baf8e DG |
1124 | assert(sock >= 0); |
1125 | ||
022d91ba | 1126 | DBG("Agent updating app socket %d", sock); |
f20baf8e DG |
1127 | |
1128 | rcu_read_lock(); | |
022d91ba | 1129 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e DG |
1130 | /* Skip event if disabled. */ |
1131 | if (!event->enabled) { | |
1132 | continue; | |
1133 | } | |
1134 | ||
022d91ba | 1135 | app = agent_find_app_by_sock(sock); |
f20baf8e DG |
1136 | /* |
1137 | * We are in the registration path thus if the application is gone, | |
1138 | * there is a serious code flow error. | |
1139 | */ | |
1140 | assert(app); | |
1141 | ||
1142 | ret = enable_event(app, event); | |
1143 | if (ret != LTTNG_OK) { | |
022d91ba | 1144 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
1145 | event->name, app->pid, app->sock->fd); |
1146 | /* Let's try the others here and don't assume the app is dead. */ | |
1147 | continue; | |
1148 | } | |
1149 | } | |
1150 | rcu_read_unlock(); | |
0475c50c | 1151 | } |