Commit | Line | Data |
---|---|---|
0475c50c | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> |
3 | * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
0475c50c | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
0475c50c | 6 | * |
0475c50c DG |
7 | */ |
8 | ||
6c1c0768 | 9 | #define _LGPL_SOURCE |
f20baf8e | 10 | #include <urcu/uatomic.h> |
bdf64013 | 11 | #include <urcu/rculist.h> |
0475c50c | 12 | |
44760c20 JR |
13 | #include <lttng/event-rule/event-rule.h> |
14 | #include <lttng/event-rule/event-rule-internal.h> | |
695f7044 JR |
15 | #include <lttng/event-rule/jul-logging.h> |
16 | #include <lttng/event-rule/log4j-logging.h> | |
17 | #include <lttng/event-rule/python-logging.h> | |
44760c20 | 18 | #include <lttng/condition/condition.h> |
670a26e4 | 19 | #include <lttng/condition/event-rule-matches.h> |
44760c20 | 20 | #include <lttng/domain-internal.h> |
85b05318 | 21 | #include <lttng/log-level-rule-internal.h> |
44760c20 | 22 | |
0475c50c | 23 | #include <common/common.h> |
022d91ba | 24 | #include <common/sessiond-comm/agent.h> |
0475c50c | 25 | |
f263b7fd JD |
26 | #include <common/compat/endian.h> |
27 | ||
022d91ba | 28 | #include "agent.h" |
f20baf8e | 29 | #include "ust-app.h" |
0475c50c | 30 | #include "utils.h" |
6712db61 | 31 | #include "common/error.h" |
23c2bd47 JG |
32 | |
33 | #define AGENT_RET_CODE_INDEX(code) (code - AGENT_RET_CODE_SUCCESS) | |
34 | ||
695f7044 JR |
35 | typedef enum lttng_event_rule_status (*event_rule_logging_get_name_pattern)( |
36 | const struct lttng_event_rule *rule, const char **pattern); | |
37 | typedef enum lttng_event_rule_status (*event_rule_logging_get_log_level_rule)( | |
38 | const struct lttng_event_rule *rule, | |
39 | const struct lttng_log_level_rule **log_level_rule); | |
40 | ||
bdf64013 JG |
41 | /* |
42 | * Agent application context representation. | |
43 | */ | |
44 | struct agent_app_ctx { | |
45 | char *provider_name; | |
46 | char *ctx_name; | |
47 | ||
48 | /* agent_app_ctx are part of the agent app_ctx_list. */ | |
49 | struct cds_list_head list_node; | |
50 | ||
51 | /* For call_rcu teardown. */ | |
52 | struct rcu_head rcu_node; | |
53 | }; | |
54 | ||
23c2bd47 JG |
55 | /* |
56 | * Human readable agent return code. | |
57 | */ | |
58 | static const char *error_string_array[] = { | |
59 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_SUCCESS) ] = "Success", | |
60 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_INVALID) ] = "Invalid command", | |
61 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_UNKNOWN_NAME) ] = "Unknown logger name", | |
62 | ||
63 | /* Last element */ | |
64 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_NR) ] = "Unknown code", | |
65 | }; | |
66 | ||
67 | static | |
68 | void log_reply_code(uint32_t in_reply_ret_code) | |
69 | { | |
70 | int level = PRINT_DBG3; | |
71 | /* | |
72 | * reply_ret_code and in_reply_ret_code are kept separate to have a | |
73 | * sanitized value (used to retrieve the human readable string) and the | |
74 | * original value which is logged as-is. | |
75 | */ | |
76 | uint32_t reply_ret_code = in_reply_ret_code; | |
77 | ||
78 | if (reply_ret_code < AGENT_RET_CODE_SUCCESS || | |
79 | reply_ret_code >= AGENT_RET_CODE_NR) { | |
80 | reply_ret_code = AGENT_RET_CODE_NR; | |
81 | level = PRINT_ERR; | |
82 | } | |
83 | ||
84 | LOG(level, "Agent replied with retcode: %s (%"PRIu32")", | |
85 | error_string_array[AGENT_RET_CODE_INDEX( | |
86 | reply_ret_code)], | |
87 | in_reply_ret_code); | |
88 | } | |
0475c50c | 89 | |
4a4ab2c3 DG |
90 | /* |
91 | * Match function for the events hash table lookup by name. | |
92 | */ | |
93 | static int ht_match_event_by_name(struct cds_lfht_node *node, | |
94 | const void *_key) | |
95 | { | |
022d91ba DG |
96 | struct agent_event *event; |
97 | const struct agent_ht_key *key; | |
4a4ab2c3 | 98 | |
a0377dfe FD |
99 | LTTNG_ASSERT(node); |
100 | LTTNG_ASSERT(_key); | |
4a4ab2c3 | 101 | |
022d91ba | 102 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
103 | key = _key; |
104 | ||
105 | /* Match 1 elements of the key: name. */ | |
106 | ||
107 | /* Event name */ | |
108 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
109 | goto no_match; | |
110 | } | |
111 | /* Match. */ | |
112 | return 1; | |
113 | ||
114 | no_match: | |
115 | return 0; | |
116 | } | |
117 | ||
118 | /* | |
44760c20 JR |
119 | * Match function for the events hash table lookup by name, log level and |
120 | * filter expression. | |
4a4ab2c3 DG |
121 | */ |
122 | static int ht_match_event(struct cds_lfht_node *node, | |
123 | const void *_key) | |
124 | { | |
022d91ba DG |
125 | struct agent_event *event; |
126 | const struct agent_ht_key *key; | |
19a97244 | 127 | int ll_match; |
4a4ab2c3 | 128 | |
a0377dfe FD |
129 | LTTNG_ASSERT(node); |
130 | LTTNG_ASSERT(_key); | |
4a4ab2c3 | 131 | |
022d91ba | 132 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
133 | key = _key; |
134 | ||
135 | /* Match 2 elements of the key: name and loglevel. */ | |
136 | ||
137 | /* Event name */ | |
138 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
139 | goto no_match; | |
140 | } | |
141 | ||
a9319624 | 142 | /* Event loglevel value and type. */ |
19a97244 PP |
143 | ll_match = loglevels_match(event->loglevel_type, |
144 | event->loglevel_value, key->loglevel_type, | |
145 | key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL); | |
146 | ||
147 | if (!ll_match) { | |
4a4ab2c3 DG |
148 | goto no_match; |
149 | } | |
a9319624 | 150 | |
6b10b3b0 | 151 | /* Filter expression */ |
d42bc3c8 | 152 | if (!!event->filter_expression != !!key->filter_expression) { |
71e147d0 | 153 | /* One has a filter expression, the other does not */ |
6b10b3b0 AM |
154 | goto no_match; |
155 | } | |
156 | ||
71e147d0 PP |
157 | if (event->filter_expression) { |
158 | if (strncmp(event->filter_expression, key->filter_expression, | |
159 | strlen(event->filter_expression)) != 0) { | |
160 | goto no_match; | |
161 | } | |
162 | } | |
163 | ||
4a4ab2c3 DG |
164 | return 1; |
165 | ||
166 | no_match: | |
167 | return 0; | |
168 | } | |
169 | ||
170 | /* | |
022d91ba | 171 | * Add unique agent event based on the event name and loglevel. |
4a4ab2c3 | 172 | */ |
022d91ba DG |
173 | static void add_unique_agent_event(struct lttng_ht *ht, |
174 | struct agent_event *event) | |
4a4ab2c3 DG |
175 | { |
176 | struct cds_lfht_node *node_ptr; | |
022d91ba | 177 | struct agent_ht_key key; |
4a4ab2c3 | 178 | |
a0377dfe FD |
179 | LTTNG_ASSERT(ht); |
180 | LTTNG_ASSERT(ht->ht); | |
181 | LTTNG_ASSERT(event); | |
4a4ab2c3 DG |
182 | |
183 | key.name = event->name; | |
2106efa0 | 184 | key.loglevel_value = event->loglevel_value; |
a9319624 | 185 | key.loglevel_type = event->loglevel_type; |
6b10b3b0 | 186 | key.filter_expression = event->filter_expression; |
4a4ab2c3 DG |
187 | |
188 | node_ptr = cds_lfht_add_unique(ht->ht, | |
189 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
190 | ht_match_event, &key, &event->node.node); | |
a0377dfe | 191 | LTTNG_ASSERT(node_ptr == &event->node.node); |
4a4ab2c3 DG |
192 | } |
193 | ||
0475c50c | 194 | /* |
022d91ba | 195 | * URCU delayed agent event reclaim. |
0475c50c | 196 | */ |
022d91ba | 197 | static void destroy_event_agent_rcu(struct rcu_head *head) |
0475c50c DG |
198 | { |
199 | struct lttng_ht_node_str *node = | |
200 | caa_container_of(head, struct lttng_ht_node_str, head); | |
022d91ba DG |
201 | struct agent_event *event = |
202 | caa_container_of(node, struct agent_event, node); | |
0475c50c | 203 | |
992febc7 | 204 | agent_destroy_event(event); |
0475c50c DG |
205 | } |
206 | ||
f20baf8e | 207 | /* |
022d91ba | 208 | * URCU delayed agent app reclaim. |
f20baf8e | 209 | */ |
022d91ba | 210 | static void destroy_app_agent_rcu(struct rcu_head *head) |
f20baf8e DG |
211 | { |
212 | struct lttng_ht_node_ulong *node = | |
213 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
022d91ba DG |
214 | struct agent_app *app = |
215 | caa_container_of(node, struct agent_app, node); | |
f20baf8e DG |
216 | |
217 | free(app); | |
218 | } | |
219 | ||
220 | /* | |
022d91ba DG |
221 | * Communication with the agent. Send the message header to the given socket in |
222 | * big endian. | |
f20baf8e DG |
223 | * |
224 | * Return 0 on success or else a negative errno message of sendmsg() op. | |
225 | */ | |
226 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, | |
227 | uint32_t cmd, uint32_t cmd_version) | |
228 | { | |
229 | int ret; | |
230 | ssize_t size; | |
022d91ba | 231 | struct lttcomm_agent_hdr msg; |
f20baf8e | 232 | |
a0377dfe | 233 | LTTNG_ASSERT(sock); |
f20baf8e | 234 | |
53efb85a | 235 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
236 | msg.data_size = htobe64(data_size); |
237 | msg.cmd = htobe32(cmd); | |
238 | msg.cmd_version = htobe32(cmd_version); | |
239 | ||
240 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
241 | if (size < sizeof(msg)) { | |
242 | ret = -errno; | |
243 | goto error; | |
244 | } | |
245 | ret = 0; | |
246 | ||
247 | error: | |
248 | return ret; | |
249 | } | |
250 | ||
251 | /* | |
022d91ba DG |
252 | * Communication call with the agent. Send the payload to the given socket. The |
253 | * header MUST be sent prior to this call. | |
f20baf8e DG |
254 | * |
255 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
256 | */ | |
bdf64013 | 257 | static int send_payload(struct lttcomm_sock *sock, const void *data, |
f20baf8e DG |
258 | size_t size) |
259 | { | |
260 | int ret; | |
261 | ssize_t len; | |
262 | ||
a0377dfe FD |
263 | LTTNG_ASSERT(sock); |
264 | LTTNG_ASSERT(data); | |
f20baf8e DG |
265 | |
266 | len = sock->ops->sendmsg(sock, data, size, 0); | |
267 | if (len < size) { | |
268 | ret = -errno; | |
269 | goto error; | |
270 | } | |
271 | ret = 0; | |
272 | ||
273 | error: | |
274 | return ret; | |
275 | } | |
276 | ||
277 | /* | |
022d91ba DG |
278 | * Communication call with the agent. Receive reply from the agent using the |
279 | * given socket. | |
f20baf8e DG |
280 | * |
281 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
282 | */ | |
283 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
284 | { | |
285 | int ret; | |
286 | ssize_t len; | |
287 | ||
a0377dfe FD |
288 | LTTNG_ASSERT(sock); |
289 | LTTNG_ASSERT(buf); | |
f20baf8e DG |
290 | |
291 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
292 | if (len < size) { | |
293 | ret = -errno; | |
294 | goto error; | |
295 | } | |
296 | ret = 0; | |
297 | ||
298 | error: | |
299 | return ret; | |
300 | } | |
301 | ||
3c6a091f | 302 | /* |
428de77a | 303 | * Internal event listing for a given app. Populate events. |
3c6a091f DG |
304 | * |
305 | * Return number of element in the list or else a negative LTTNG_ERR* code. | |
428de77a MD |
306 | * On success, the caller is responsible for freeing the memory |
307 | * allocated for "events". | |
3c6a091f | 308 | */ |
022d91ba | 309 | static ssize_t list_events(struct agent_app *app, struct lttng_event **events) |
3c6a091f DG |
310 | { |
311 | int ret, i, len = 0, offset = 0; | |
312 | uint32_t nb_event; | |
313 | size_t data_size; | |
d84af1a4 | 314 | uint32_t reply_ret_code; |
3c6a091f | 315 | struct lttng_event *tmp_events = NULL; |
022d91ba DG |
316 | struct lttcomm_agent_list_reply *reply = NULL; |
317 | struct lttcomm_agent_list_reply_hdr reply_hdr; | |
3c6a091f | 318 | |
a0377dfe FD |
319 | LTTNG_ASSERT(app); |
320 | LTTNG_ASSERT(app->sock); | |
321 | LTTNG_ASSERT(events); | |
3c6a091f | 322 | |
022d91ba | 323 | DBG2("Agent listing events for app pid: %d and socket %d", app->pid, |
3c6a091f DG |
324 | app->sock->fd); |
325 | ||
022d91ba | 326 | ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0); |
3c6a091f DG |
327 | if (ret < 0) { |
328 | goto error_io; | |
329 | } | |
330 | ||
331 | /* Get list header so we know how much we'll receive. */ | |
332 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); | |
333 | if (ret < 0) { | |
334 | goto error_io; | |
335 | } | |
336 | ||
d84af1a4 JG |
337 | reply_ret_code = be32toh(reply_hdr.ret_code); |
338 | log_reply_code(reply_ret_code); | |
339 | switch (reply_ret_code) { | |
022d91ba | 340 | case AGENT_RET_CODE_SUCCESS: |
3c6a091f DG |
341 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
342 | break; | |
343 | default: | |
3bd9aaeb | 344 | ret = LTTNG_ERR_UNK; |
3c6a091f DG |
345 | goto error; |
346 | } | |
347 | ||
348 | reply = zmalloc(data_size); | |
349 | if (!reply) { | |
350 | ret = LTTNG_ERR_NOMEM; | |
351 | goto error; | |
352 | } | |
353 | ||
354 | /* Get the list with the appropriate data size. */ | |
355 | ret = recv_reply(app->sock, reply, data_size); | |
356 | if (ret < 0) { | |
357 | goto error_io; | |
358 | } | |
359 | ||
360 | nb_event = be32toh(reply->nb_event); | |
361 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); | |
362 | if (!tmp_events) { | |
363 | ret = LTTNG_ERR_NOMEM; | |
364 | goto error; | |
365 | } | |
366 | ||
367 | for (i = 0; i < nb_event; i++) { | |
368 | offset += len; | |
0a85e7a3 MD |
369 | if (lttng_strncpy(tmp_events[i].name, reply->payload + offset, |
370 | sizeof(tmp_events[i].name))) { | |
371 | ret = LTTNG_ERR_INVALID; | |
372 | goto error; | |
373 | } | |
3c6a091f DG |
374 | tmp_events[i].pid = app->pid; |
375 | tmp_events[i].enabled = -1; | |
376 | len = strlen(reply->payload + offset) + 1; | |
377 | } | |
378 | ||
379 | *events = tmp_events; | |
380 | ||
381 | free(reply); | |
382 | return nb_event; | |
383 | ||
384 | error_io: | |
385 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
386 | error: | |
387 | free(reply); | |
388 | free(tmp_events); | |
389 | return -ret; | |
390 | ||
391 | } | |
392 | ||
f20baf8e | 393 | /* |
022d91ba DG |
394 | * Internal enable agent event on a agent application. This function |
395 | * communicates with the agent to enable a given event. | |
f20baf8e DG |
396 | * |
397 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
398 | */ | |
733c9165 | 399 | static int enable_event(const struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
400 | { |
401 | int ret; | |
a0ba721c | 402 | char *bytes_to_send; |
f20baf8e | 403 | uint64_t data_size; |
a0ba721c | 404 | size_t filter_expression_length; |
f4f9d4db | 405 | uint32_t reply_ret_code; |
bdf64013 | 406 | struct lttcomm_agent_enable_event msg; |
022d91ba | 407 | struct lttcomm_agent_generic_reply reply; |
f20baf8e | 408 | |
a0377dfe FD |
409 | LTTNG_ASSERT(app); |
410 | LTTNG_ASSERT(app->sock); | |
411 | LTTNG_ASSERT(event); | |
f20baf8e | 412 | |
022d91ba | 413 | DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
414 | app->pid, app->sock->fd); |
415 | ||
a0ba721c AM |
416 | /* |
417 | * Calculate the payload's size, which is the fixed-size struct followed | |
418 | * by the variable-length filter expression (+1 for the ending \0). | |
419 | */ | |
420 | if (!event->filter_expression) { | |
421 | filter_expression_length = 0; | |
422 | } else { | |
423 | filter_expression_length = strlen(event->filter_expression) + 1; | |
424 | } | |
425 | data_size = sizeof(msg) + filter_expression_length; | |
f20baf8e | 426 | |
53efb85a | 427 | memset(&msg, 0, sizeof(msg)); |
a9bfd666 JG |
428 | msg.loglevel_value = htobe32(event->loglevel_value); |
429 | msg.loglevel_type = htobe32(event->loglevel_type); | |
bb45c03e MD |
430 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { |
431 | ret = LTTNG_ERR_INVALID; | |
432 | goto error; | |
433 | } | |
a9bfd666 | 434 | msg.filter_expression_length = htobe32(filter_expression_length); |
a0ba721c | 435 | |
bb45c03e MD |
436 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
437 | if (ret < 0) { | |
438 | goto error_io; | |
439 | } | |
440 | ||
a0ba721c AM |
441 | bytes_to_send = zmalloc(data_size); |
442 | if (!bytes_to_send) { | |
443 | ret = LTTNG_ERR_NOMEM; | |
444 | goto error; | |
445 | } | |
446 | ||
447 | memcpy(bytes_to_send, &msg, sizeof(msg)); | |
448 | if (filter_expression_length > 0) { | |
449 | memcpy(bytes_to_send + sizeof(msg), event->filter_expression, | |
450 | filter_expression_length); | |
451 | } | |
452 | ||
453 | ret = send_payload(app->sock, bytes_to_send, data_size); | |
454 | free(bytes_to_send); | |
f20baf8e DG |
455 | if (ret < 0) { |
456 | goto error_io; | |
457 | } | |
458 | ||
459 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
460 | if (ret < 0) { | |
461 | goto error_io; | |
462 | } | |
463 | ||
f4f9d4db JG |
464 | reply_ret_code = be32toh(reply.ret_code); |
465 | log_reply_code(reply_ret_code); | |
466 | switch (reply_ret_code) { | |
022d91ba | 467 | case AGENT_RET_CODE_SUCCESS: |
f20baf8e | 468 | break; |
022d91ba | 469 | case AGENT_RET_CODE_UNKNOWN_NAME: |
f20baf8e DG |
470 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
471 | goto error; | |
472 | default: | |
3bd9aaeb | 473 | ret = LTTNG_ERR_UNK; |
f20baf8e DG |
474 | goto error; |
475 | } | |
476 | ||
477 | return LTTNG_OK; | |
478 | ||
479 | error_io: | |
480 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
481 | error: | |
482 | return ret; | |
483 | } | |
484 | ||
bdf64013 JG |
485 | /* |
486 | * Send Pascal-style string. Size is sent as a 32-bit big endian integer. | |
487 | */ | |
488 | static | |
489 | int send_pstring(struct lttcomm_sock *sock, const char *str, uint32_t len) | |
490 | { | |
491 | int ret; | |
492 | uint32_t len_be; | |
493 | ||
494 | len_be = htobe32(len); | |
495 | ret = send_payload(sock, &len_be, sizeof(len_be)); | |
496 | if (ret) { | |
497 | goto end; | |
498 | } | |
499 | ||
500 | ret = send_payload(sock, str, len); | |
501 | if (ret) { | |
502 | goto end; | |
503 | } | |
504 | end: | |
505 | return ret; | |
506 | } | |
507 | ||
508 | /* | |
509 | * Internal enable application context on an agent application. This function | |
510 | * communicates with the agent to enable a given application context. | |
511 | * | |
512 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
513 | */ | |
733c9165 JG |
514 | static int app_context_op(const struct agent_app *app, |
515 | const struct agent_app_ctx *ctx, enum lttcomm_agent_command cmd) | |
bdf64013 JG |
516 | { |
517 | int ret; | |
518 | uint32_t reply_ret_code; | |
519 | struct lttcomm_agent_generic_reply reply; | |
520 | size_t app_ctx_provider_name_len, app_ctx_name_len, data_size; | |
521 | ||
a0377dfe FD |
522 | LTTNG_ASSERT(app); |
523 | LTTNG_ASSERT(app->sock); | |
524 | LTTNG_ASSERT(ctx); | |
525 | LTTNG_ASSERT(cmd == AGENT_CMD_APP_CTX_ENABLE || | |
bdf64013 JG |
526 | cmd == AGENT_CMD_APP_CTX_DISABLE); |
527 | ||
528 | DBG2("Agent %s application %s:%s for app pid: %d and socket %d", | |
529 | cmd == AGENT_CMD_APP_CTX_ENABLE ? "enabling" : "disabling", | |
530 | ctx->provider_name, ctx->ctx_name, | |
531 | app->pid, app->sock->fd); | |
532 | ||
533 | /* | |
534 | * Calculate the payload's size, which consists of the size (u32, BE) | |
535 | * of the provider name, the NULL-terminated provider name string, the | |
536 | * size (u32, BE) of the context name, followed by the NULL-terminated | |
537 | * context name string. | |
538 | */ | |
539 | app_ctx_provider_name_len = strlen(ctx->provider_name) + 1; | |
540 | app_ctx_name_len = strlen(ctx->ctx_name) + 1; | |
541 | data_size = sizeof(uint32_t) + app_ctx_provider_name_len + | |
542 | sizeof(uint32_t) + app_ctx_name_len; | |
543 | ||
544 | ret = send_header(app->sock, data_size, cmd, 0); | |
545 | if (ret < 0) { | |
546 | goto error_io; | |
547 | } | |
548 | ||
549 | if (app_ctx_provider_name_len > UINT32_MAX || | |
550 | app_ctx_name_len > UINT32_MAX) { | |
551 | ERR("Application context name > MAX_UINT32"); | |
552 | ret = LTTNG_ERR_INVALID; | |
553 | goto error; | |
554 | } | |
555 | ||
556 | ret = send_pstring(app->sock, ctx->provider_name, | |
557 | (uint32_t) app_ctx_provider_name_len); | |
558 | if (ret < 0) { | |
559 | goto error_io; | |
560 | } | |
561 | ||
562 | ret = send_pstring(app->sock, ctx->ctx_name, | |
563 | (uint32_t) app_ctx_name_len); | |
564 | if (ret < 0) { | |
565 | goto error_io; | |
566 | } | |
567 | ||
568 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
569 | if (ret < 0) { | |
570 | goto error_io; | |
571 | } | |
572 | ||
573 | reply_ret_code = be32toh(reply.ret_code); | |
574 | log_reply_code(reply_ret_code); | |
575 | switch (reply_ret_code) { | |
576 | case AGENT_RET_CODE_SUCCESS: | |
577 | break; | |
578 | default: | |
579 | ret = LTTNG_ERR_UNK; | |
580 | goto error; | |
581 | } | |
582 | ||
583 | return LTTNG_OK; | |
584 | ||
585 | error_io: | |
586 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
587 | error: | |
588 | return ret; | |
589 | } | |
590 | ||
f20baf8e | 591 | /* |
022d91ba DG |
592 | * Internal disable agent event call on a agent application. This function |
593 | * communicates with the agent to disable a given event. | |
f20baf8e DG |
594 | * |
595 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
596 | */ | |
022d91ba | 597 | static int disable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
598 | { |
599 | int ret; | |
600 | uint64_t data_size; | |
517992f8 | 601 | uint32_t reply_ret_code; |
bdf64013 | 602 | struct lttcomm_agent_disable_event msg; |
022d91ba | 603 | struct lttcomm_agent_generic_reply reply; |
f20baf8e | 604 | |
a0377dfe FD |
605 | LTTNG_ASSERT(app); |
606 | LTTNG_ASSERT(app->sock); | |
607 | LTTNG_ASSERT(event); | |
f20baf8e | 608 | |
022d91ba | 609 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
610 | app->pid, app->sock->fd); |
611 | ||
612 | data_size = sizeof(msg); | |
63be730a MD |
613 | memset(&msg, 0, sizeof(msg)); |
614 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { | |
615 | ret = LTTNG_ERR_INVALID; | |
616 | goto error; | |
617 | } | |
f20baf8e | 618 | |
022d91ba | 619 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
f20baf8e DG |
620 | if (ret < 0) { |
621 | goto error_io; | |
622 | } | |
623 | ||
f20baf8e DG |
624 | ret = send_payload(app->sock, &msg, sizeof(msg)); |
625 | if (ret < 0) { | |
626 | goto error_io; | |
627 | } | |
628 | ||
629 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
630 | if (ret < 0) { | |
631 | goto error_io; | |
632 | } | |
633 | ||
517992f8 JG |
634 | reply_ret_code = be32toh(reply.ret_code); |
635 | log_reply_code(reply_ret_code); | |
636 | switch (reply_ret_code) { | |
022d91ba DG |
637 | case AGENT_RET_CODE_SUCCESS: |
638 | break; | |
639 | case AGENT_RET_CODE_UNKNOWN_NAME: | |
640 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
641 | goto error; | |
642 | default: | |
3bd9aaeb | 643 | ret = LTTNG_ERR_UNK; |
022d91ba | 644 | goto error; |
f20baf8e DG |
645 | } |
646 | ||
647 | return LTTNG_OK; | |
648 | ||
649 | error_io: | |
650 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
651 | error: | |
652 | return ret; | |
653 | } | |
654 | ||
1b500e7a | 655 | /* |
022d91ba | 656 | * Send back the registration DONE command to a given agent application. |
1b500e7a DG |
657 | * |
658 | * Return 0 on success or else a negative value. | |
659 | */ | |
022d91ba | 660 | int agent_send_registration_done(struct agent_app *app) |
1b500e7a | 661 | { |
a0377dfe FD |
662 | LTTNG_ASSERT(app); |
663 | LTTNG_ASSERT(app->sock); | |
1b500e7a | 664 | |
022d91ba | 665 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
1b500e7a | 666 | |
b26d1f5c | 667 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0); |
1b500e7a DG |
668 | } |
669 | ||
f20baf8e | 670 | /* |
022d91ba | 671 | * Enable agent event on every agent applications registered with the session |
f20baf8e DG |
672 | * daemon. |
673 | * | |
674 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
675 | */ | |
fefd409b DG |
676 | int agent_enable_event(struct agent_event *event, |
677 | enum lttng_domain_type domain) | |
f20baf8e DG |
678 | { |
679 | int ret; | |
022d91ba | 680 | struct agent_app *app; |
f20baf8e DG |
681 | struct lttng_ht_iter iter; |
682 | ||
a0377dfe | 683 | LTTNG_ASSERT(event); |
f20baf8e DG |
684 | |
685 | rcu_read_lock(); | |
686 | ||
412d7227 | 687 | cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 688 | node.node) { |
fefd409b DG |
689 | if (app->domain != domain) { |
690 | continue; | |
691 | } | |
692 | ||
022d91ba | 693 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
694 | ret = enable_event(app, event); |
695 | if (ret != LTTNG_OK) { | |
696 | goto error; | |
697 | } | |
f20baf8e DG |
698 | } |
699 | ||
44760c20 | 700 | event->enabled_count++; |
f20baf8e DG |
701 | ret = LTTNG_OK; |
702 | ||
703 | error: | |
704 | rcu_read_unlock(); | |
705 | return ret; | |
706 | } | |
707 | ||
bdf64013 JG |
708 | static |
709 | void destroy_app_ctx(struct agent_app_ctx *ctx) | |
710 | { | |
711 | free(ctx->provider_name); | |
712 | free(ctx->ctx_name); | |
713 | free(ctx); | |
714 | } | |
715 | ||
716 | static | |
df4f5a87 | 717 | struct agent_app_ctx *create_app_ctx(const struct lttng_event_context *ctx) |
bdf64013 JG |
718 | { |
719 | struct agent_app_ctx *agent_ctx = NULL; | |
720 | ||
721 | if (!ctx) { | |
722 | goto end; | |
723 | } | |
724 | ||
a0377dfe | 725 | LTTNG_ASSERT(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); |
bdf64013 JG |
726 | agent_ctx = zmalloc(sizeof(*ctx)); |
727 | if (!agent_ctx) { | |
728 | goto end; | |
729 | } | |
730 | ||
731 | agent_ctx->provider_name = strdup(ctx->u.app_ctx.provider_name); | |
732 | agent_ctx->ctx_name = strdup(ctx->u.app_ctx.ctx_name); | |
733 | if (!agent_ctx->provider_name || !agent_ctx->ctx_name) { | |
734 | destroy_app_ctx(agent_ctx); | |
735 | agent_ctx = NULL; | |
736 | } | |
737 | end: | |
738 | return agent_ctx; | |
739 | } | |
740 | ||
741 | /* | |
742 | * Enable agent context on every agent applications registered with the session | |
743 | * daemon. | |
744 | * | |
745 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
746 | */ | |
df4f5a87 | 747 | int agent_enable_context(const struct lttng_event_context *ctx, |
bdf64013 JG |
748 | enum lttng_domain_type domain) |
749 | { | |
750 | int ret; | |
751 | struct agent_app *app; | |
752 | struct lttng_ht_iter iter; | |
753 | ||
a0377dfe | 754 | LTTNG_ASSERT(ctx); |
bdf64013 JG |
755 | if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
756 | ret = LTTNG_ERR_INVALID; | |
757 | goto error; | |
758 | } | |
759 | ||
760 | rcu_read_lock(); | |
761 | ||
412d7227 | 762 | cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app, |
bdf64013 JG |
763 | node.node) { |
764 | struct agent_app_ctx *agent_ctx; | |
765 | ||
766 | if (app->domain != domain) { | |
767 | continue; | |
768 | } | |
769 | ||
770 | agent_ctx = create_app_ctx(ctx); | |
771 | if (!agent_ctx) { | |
a33c2651 | 772 | ret = LTTNG_ERR_NOMEM; |
bdf64013 JG |
773 | goto error_unlock; |
774 | } | |
775 | ||
776 | /* Enable event on agent application through TCP socket. */ | |
777 | ret = app_context_op(app, agent_ctx, AGENT_CMD_APP_CTX_ENABLE); | |
c12618b5 | 778 | destroy_app_ctx(agent_ctx); |
bdf64013 | 779 | if (ret != LTTNG_OK) { |
bdf64013 JG |
780 | goto error_unlock; |
781 | } | |
782 | } | |
783 | ||
784 | ret = LTTNG_OK; | |
785 | ||
786 | error_unlock: | |
787 | rcu_read_unlock(); | |
788 | error: | |
789 | return ret; | |
790 | } | |
791 | ||
f20baf8e | 792 | /* |
bdf64013 | 793 | * Disable agent event on every agent application registered with the session |
f20baf8e DG |
794 | * daemon. |
795 | * | |
796 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
797 | */ | |
fefd409b DG |
798 | int agent_disable_event(struct agent_event *event, |
799 | enum lttng_domain_type domain) | |
f20baf8e | 800 | { |
f1bc0129 | 801 | int ret = LTTNG_OK; |
022d91ba | 802 | struct agent_app *app; |
f20baf8e DG |
803 | struct lttng_ht_iter iter; |
804 | ||
a0377dfe | 805 | LTTNG_ASSERT(event); |
44760c20 JR |
806 | if (!AGENT_EVENT_IS_ENABLED(event)) { |
807 | goto end; | |
808 | } | |
809 | ||
810 | if (--event->enabled_count != 0) { | |
811 | /* | |
812 | * Agent event still enabled. Disable the agent event only when | |
813 | * all "users" have disabled it (event notifiers, event rules, | |
814 | * etc.). | |
815 | */ | |
816 | ret = LTTNG_OK; | |
f1bc0129 JG |
817 | goto end; |
818 | } | |
f20baf8e DG |
819 | |
820 | rcu_read_lock(); | |
821 | ||
412d7227 | 822 | cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 823 | node.node) { |
fefd409b DG |
824 | if (app->domain != domain) { |
825 | continue; | |
826 | } | |
827 | ||
022d91ba | 828 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
829 | ret = disable_event(app, event); |
830 | if (ret != LTTNG_OK) { | |
831 | goto error; | |
832 | } | |
f20baf8e DG |
833 | } |
834 | ||
44760c20 | 835 | /* event->enabled_count is now 0. */ |
a0377dfe | 836 | LTTNG_ASSERT(!AGENT_EVENT_IS_ENABLED(event)); |
f20baf8e DG |
837 | |
838 | error: | |
839 | rcu_read_unlock(); | |
f1bc0129 | 840 | end: |
f20baf8e DG |
841 | return ret; |
842 | } | |
843 | ||
bdf64013 JG |
844 | /* |
845 | * Disable agent context on every agent application registered with the session | |
846 | * daemon. | |
847 | * | |
848 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
849 | */ | |
46440d0c SM |
850 | static int disable_context(struct agent_app_ctx *ctx, |
851 | enum lttng_domain_type domain) | |
bdf64013 JG |
852 | { |
853 | int ret = LTTNG_OK; | |
854 | struct agent_app *app; | |
855 | struct lttng_ht_iter iter; | |
856 | ||
a0377dfe | 857 | LTTNG_ASSERT(ctx); |
bdf64013 JG |
858 | |
859 | rcu_read_lock(); | |
860 | DBG2("Disabling agent application context %s:%s", | |
861 | ctx->provider_name, ctx->ctx_name); | |
412d7227 | 862 | cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app, |
bdf64013 JG |
863 | node.node) { |
864 | if (app->domain != domain) { | |
865 | continue; | |
866 | } | |
867 | ||
868 | ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_DISABLE); | |
869 | if (ret != LTTNG_OK) { | |
870 | goto end; | |
871 | } | |
872 | } | |
873 | end: | |
874 | rcu_read_unlock(); | |
875 | return ret; | |
876 | } | |
877 | ||
f20baf8e | 878 | /* |
022d91ba DG |
879 | * Ask every agent for the list of possible event. Events is allocated with the |
880 | * events of every agent application. | |
f20baf8e DG |
881 | * |
882 | * Return the number of events or else a negative value. | |
883 | */ | |
f60140a1 DG |
884 | int agent_list_events(struct lttng_event **events, |
885 | enum lttng_domain_type domain) | |
f20baf8e DG |
886 | { |
887 | int ret; | |
888 | size_t nbmem, count = 0; | |
022d91ba | 889 | struct agent_app *app; |
aae6255e | 890 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
891 | struct lttng_ht_iter iter; |
892 | ||
a0377dfe | 893 | LTTNG_ASSERT(events); |
f20baf8e | 894 | |
0e115563 DG |
895 | DBG2("Agent listing events for domain %d", domain); |
896 | ||
f20baf8e DG |
897 | nbmem = UST_APP_EVENT_LIST_SIZE; |
898 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
899 | if (!tmp_events) { | |
022d91ba | 900 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
901 | ret = -ENOMEM; |
902 | goto error; | |
903 | } | |
904 | ||
905 | rcu_read_lock(); | |
412d7227 | 906 | cds_lfht_for_each_entry(the_agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
907 | node.node) { |
908 | ssize_t nb_ev; | |
022d91ba | 909 | struct lttng_event *agent_events; |
f20baf8e | 910 | |
f60140a1 DG |
911 | /* Skip domain not asked by the list. */ |
912 | if (app->domain != domain) { | |
913 | continue; | |
914 | } | |
915 | ||
022d91ba | 916 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
917 | if (nb_ev < 0) { |
918 | ret = nb_ev; | |
428de77a | 919 | goto error_unlock; |
f20baf8e DG |
920 | } |
921 | ||
53efb85a | 922 | if (count + nb_ev > nbmem) { |
f20baf8e | 923 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
924 | struct lttng_event *new_tmp_events; |
925 | size_t new_nbmem; | |
926 | ||
927 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 928 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
929 | nbmem, new_nbmem); |
930 | new_tmp_events = realloc(tmp_events, | |
931 | new_nbmem * sizeof(*new_tmp_events)); | |
932 | if (!new_tmp_events) { | |
022d91ba | 933 | PERROR("realloc agent events"); |
f20baf8e | 934 | ret = -ENOMEM; |
022d91ba | 935 | free(agent_events); |
428de77a | 936 | goto error_unlock; |
f20baf8e | 937 | } |
53efb85a MD |
938 | /* Zero the new memory */ |
939 | memset(new_tmp_events + nbmem, 0, | |
940 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
941 | nbmem = new_nbmem; | |
942 | tmp_events = new_tmp_events; | |
f20baf8e | 943 | } |
022d91ba | 944 | memcpy(tmp_events + count, agent_events, |
53efb85a | 945 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 946 | free(agent_events); |
f20baf8e DG |
947 | count += nb_ev; |
948 | } | |
949 | rcu_read_unlock(); | |
950 | ||
951 | ret = count; | |
952 | *events = tmp_events; | |
aae6255e | 953 | return ret; |
f20baf8e | 954 | |
428de77a MD |
955 | error_unlock: |
956 | rcu_read_unlock(); | |
f20baf8e | 957 | error: |
aae6255e | 958 | free(tmp_events); |
f20baf8e DG |
959 | return ret; |
960 | } | |
961 | ||
962 | /* | |
022d91ba | 963 | * Create a agent app object using the given PID. |
f20baf8e DG |
964 | * |
965 | * Return newly allocated object or else NULL on error. | |
966 | */ | |
fefd409b DG |
967 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
968 | struct lttcomm_sock *sock) | |
f20baf8e | 969 | { |
022d91ba | 970 | struct agent_app *app; |
f20baf8e | 971 | |
a0377dfe | 972 | LTTNG_ASSERT(sock); |
f20baf8e DG |
973 | |
974 | app = zmalloc(sizeof(*app)); | |
975 | if (!app) { | |
733c9165 | 976 | PERROR("Failed to allocate agent application instance"); |
f20baf8e DG |
977 | goto error; |
978 | } | |
979 | ||
980 | app->pid = pid; | |
fefd409b | 981 | app->domain = domain; |
f20baf8e | 982 | app->sock = sock; |
f20baf8e DG |
983 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
984 | ||
985 | error: | |
986 | return app; | |
987 | } | |
988 | ||
989 | /* | |
022d91ba | 990 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
991 | * |
992 | * RCU read side lock MUST be acquired. | |
993 | * | |
994 | * Return object if found else NULL. | |
995 | */ | |
022d91ba | 996 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
997 | { |
998 | struct lttng_ht_node_ulong *node; | |
999 | struct lttng_ht_iter iter; | |
022d91ba | 1000 | struct agent_app *app; |
f20baf8e | 1001 | |
a0377dfe | 1002 | LTTNG_ASSERT(sock >= 0); |
f20baf8e | 1003 | |
412d7227 SM |
1004 | lttng_ht_lookup(the_agent_apps_ht_by_sock, |
1005 | (void *) ((unsigned long) sock), &iter); | |
f20baf8e DG |
1006 | node = lttng_ht_iter_get_node_ulong(&iter); |
1007 | if (node == NULL) { | |
1008 | goto error; | |
1009 | } | |
022d91ba | 1010 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 1011 | |
022d91ba | 1012 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
1013 | return app; |
1014 | ||
1015 | error: | |
022d91ba | 1016 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
1017 | return NULL; |
1018 | } | |
1019 | ||
1020 | /* | |
022d91ba | 1021 | * Add agent application object to the global hash table. |
f20baf8e | 1022 | */ |
022d91ba | 1023 | void agent_add_app(struct agent_app *app) |
f20baf8e | 1024 | { |
a0377dfe | 1025 | LTTNG_ASSERT(app); |
f20baf8e | 1026 | |
022d91ba | 1027 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
412d7227 | 1028 | lttng_ht_add_unique_ulong(the_agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
1029 | } |
1030 | ||
f20baf8e | 1031 | /* |
022d91ba | 1032 | * Delete agent application from the global hash table. |
d558f236 JG |
1033 | * |
1034 | * rcu_read_lock() must be held by the caller. | |
f20baf8e | 1035 | */ |
022d91ba | 1036 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
1037 | { |
1038 | int ret; | |
1039 | struct lttng_ht_iter iter; | |
1040 | ||
a0377dfe | 1041 | LTTNG_ASSERT(app); |
f20baf8e | 1042 | |
022d91ba | 1043 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
1044 | |
1045 | iter.iter.node = &app->node.node; | |
412d7227 | 1046 | ret = lttng_ht_del(the_agent_apps_ht_by_sock, &iter); |
a0377dfe | 1047 | LTTNG_ASSERT(!ret); |
f20baf8e DG |
1048 | } |
1049 | ||
1050 | /* | |
e785906c | 1051 | * Destroy an agent application object by detaching it from its corresponding |
022d91ba | 1052 | * UST app if one is connected by closing the socket. Finally, perform a |
428de77a | 1053 | * delayed memory reclaim. |
f20baf8e | 1054 | */ |
022d91ba | 1055 | void agent_destroy_app(struct agent_app *app) |
f20baf8e | 1056 | { |
a0377dfe | 1057 | LTTNG_ASSERT(app); |
f20baf8e DG |
1058 | |
1059 | if (app->sock) { | |
1060 | app->sock->ops->close(app->sock); | |
1061 | lttcomm_destroy_sock(app->sock); | |
1062 | } | |
1063 | ||
022d91ba | 1064 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
1065 | } |
1066 | ||
0475c50c | 1067 | /* |
022d91ba | 1068 | * Initialize an already allocated agent object. |
0475c50c DG |
1069 | * |
1070 | * Return 0 on success or else a negative errno value. | |
1071 | */ | |
022d91ba | 1072 | int agent_init(struct agent *agt) |
0475c50c DG |
1073 | { |
1074 | int ret; | |
1075 | ||
a0377dfe | 1076 | LTTNG_ASSERT(agt); |
0475c50c | 1077 | |
022d91ba DG |
1078 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
1079 | if (!agt->events) { | |
0475c50c DG |
1080 | ret = -ENOMEM; |
1081 | goto error; | |
1082 | } | |
fefd409b | 1083 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
0475c50c | 1084 | |
bdf64013 | 1085 | CDS_INIT_LIST_HEAD(&agt->app_ctx_list); |
0475c50c DG |
1086 | return 0; |
1087 | ||
1088 | error: | |
1089 | return ret; | |
1090 | } | |
1091 | ||
fefd409b DG |
1092 | /* |
1093 | * Add agent object to the given hash table. | |
1094 | */ | |
1095 | void agent_add(struct agent *agt, struct lttng_ht *ht) | |
1096 | { | |
a0377dfe FD |
1097 | LTTNG_ASSERT(agt); |
1098 | LTTNG_ASSERT(ht); | |
fefd409b DG |
1099 | |
1100 | DBG3("Agent adding from domain %d", agt->domain); | |
1101 | ||
fefd409b | 1102 | lttng_ht_add_unique_u64(ht, &agt->node); |
fefd409b DG |
1103 | } |
1104 | ||
1105 | /* | |
1106 | * Create an agent object for the given domain. | |
1107 | * | |
1108 | * Return the allocated agent or NULL on error. | |
1109 | */ | |
1110 | struct agent *agent_create(enum lttng_domain_type domain) | |
1111 | { | |
1112 | int ret; | |
1113 | struct agent *agt; | |
1114 | ||
3b5f70d4 | 1115 | agt = zmalloc(sizeof(struct agent)); |
fefd409b DG |
1116 | if (!agt) { |
1117 | goto error; | |
1118 | } | |
1119 | agt->domain = domain; | |
1120 | ||
1121 | ret = agent_init(agt); | |
1122 | if (ret < 0) { | |
1123 | free(agt); | |
988ae332 | 1124 | agt = NULL; |
fefd409b DG |
1125 | goto error; |
1126 | } | |
1127 | ||
1128 | error: | |
1129 | return agt; | |
1130 | } | |
1131 | ||
0475c50c | 1132 | /* |
51755dc8 JG |
1133 | * Create a newly allocated agent event data structure. |
1134 | * Ownership of filter_expression is taken. | |
0475c50c DG |
1135 | * |
1136 | * Return a new object else NULL on error. | |
1137 | */ | |
022d91ba | 1138 | struct agent_event *agent_create_event(const char *name, |
a9319624 | 1139 | enum lttng_loglevel_type loglevel_type, int loglevel_value, |
2b00d462 | 1140 | struct lttng_bytecode *filter, char *filter_expression) |
0475c50c | 1141 | { |
51755dc8 | 1142 | struct agent_event *event = NULL; |
0475c50c | 1143 | |
6b10b3b0 AM |
1144 | DBG3("Agent create new event with name %s, loglevel type %d, \ |
1145 | loglevel value %d and filter %s", | |
40111ba1 JG |
1146 | name, loglevel_type, loglevel_value, |
1147 | filter_expression ? filter_expression : "NULL"); | |
0475c50c | 1148 | |
51755dc8 JG |
1149 | if (!name) { |
1150 | ERR("Failed to create agent event; no name provided."); | |
0475c50c DG |
1151 | goto error; |
1152 | } | |
1153 | ||
51755dc8 JG |
1154 | event = zmalloc(sizeof(*event)); |
1155 | if (!event) { | |
1156 | goto error; | |
0475c50c DG |
1157 | } |
1158 | ||
51755dc8 JG |
1159 | strncpy(event->name, name, sizeof(event->name)); |
1160 | event->name[sizeof(event->name) - 1] = '\0'; | |
1161 | lttng_ht_node_init_str(&event->node, event->name); | |
be6a6276 | 1162 | |
2106efa0 | 1163 | event->loglevel_value = loglevel_value; |
51755dc8 JG |
1164 | event->loglevel_type = loglevel_type; |
1165 | event->filter = filter; | |
1166 | event->filter_expression = filter_expression; | |
0475c50c DG |
1167 | error: |
1168 | return event; | |
1169 | } | |
1170 | ||
1171 | /* | |
022d91ba | 1172 | * Unique add of a agent event to an agent object. |
0475c50c | 1173 | */ |
022d91ba | 1174 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c | 1175 | { |
a0377dfe FD |
1176 | LTTNG_ASSERT(event); |
1177 | LTTNG_ASSERT(agt); | |
1178 | LTTNG_ASSERT(agt->events); | |
0475c50c | 1179 | |
022d91ba | 1180 | DBG3("Agent adding event %s", event->name); |
022d91ba | 1181 | add_unique_agent_event(agt->events, event); |
022d91ba | 1182 | agt->being_used = 1; |
0475c50c DG |
1183 | } |
1184 | ||
bdf64013 JG |
1185 | /* |
1186 | * Unique add of a agent context to an agent object. | |
1187 | */ | |
df4f5a87 | 1188 | int agent_add_context(const struct lttng_event_context *ctx, struct agent *agt) |
bdf64013 JG |
1189 | { |
1190 | int ret = LTTNG_OK; | |
1191 | struct agent_app_ctx *agent_ctx = NULL; | |
1192 | ||
a0377dfe FD |
1193 | LTTNG_ASSERT(ctx); |
1194 | LTTNG_ASSERT(agt); | |
1195 | LTTNG_ASSERT(agt->events); | |
1196 | LTTNG_ASSERT(ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
bdf64013 JG |
1197 | |
1198 | agent_ctx = create_app_ctx(ctx); | |
1199 | if (!agent_ctx) { | |
1200 | ret = LTTNG_ERR_NOMEM; | |
1201 | goto end; | |
1202 | } | |
1203 | ||
1204 | DBG3("Agent adding context %s:%s", ctx->u.app_ctx.provider_name, | |
1205 | ctx->u.app_ctx.ctx_name); | |
1206 | cds_list_add_tail_rcu(&agent_ctx->list_node, &agt->app_ctx_list); | |
1207 | end: | |
1208 | return ret; | |
1209 | } | |
1210 | ||
0475c50c | 1211 | /* |
e261a6cc | 1212 | * Find multiple agent events sharing the given name. |
4a4ab2c3 | 1213 | * |
e261a6cc PP |
1214 | * RCU read side lock MUST be acquired. It must be held for the |
1215 | * duration of the iteration. | |
4a4ab2c3 | 1216 | * |
e261a6cc | 1217 | * Sets the given iterator. |
4a4ab2c3 | 1218 | */ |
e261a6cc PP |
1219 | void agent_find_events_by_name(const char *name, struct agent *agt, |
1220 | struct lttng_ht_iter* iter) | |
4a4ab2c3 | 1221 | { |
4a4ab2c3 | 1222 | struct lttng_ht *ht; |
022d91ba | 1223 | struct agent_ht_key key; |
4a4ab2c3 | 1224 | |
a0377dfe FD |
1225 | LTTNG_ASSERT(name); |
1226 | LTTNG_ASSERT(agt); | |
1227 | LTTNG_ASSERT(agt->events); | |
1228 | LTTNG_ASSERT(iter); | |
4a4ab2c3 | 1229 | |
022d91ba | 1230 | ht = agt->events; |
4a4ab2c3 DG |
1231 | key.name = name; |
1232 | ||
1233 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
e261a6cc PP |
1234 | ht_match_event_by_name, &key, &iter->iter); |
1235 | } | |
4a4ab2c3 | 1236 | |
44760c20 JR |
1237 | /* |
1238 | * Find the agent event matching a trigger. | |
1239 | * | |
1240 | * RCU read side lock MUST be acquired. It must be held for as long as | |
1241 | * the returned agent_event is used. | |
1242 | * | |
1243 | * Return object if found else NULL. | |
1244 | */ | |
1245 | struct agent_event *agent_find_event_by_trigger( | |
1246 | const struct lttng_trigger *trigger, struct agent *agt) | |
1247 | { | |
1248 | enum lttng_condition_status c_status; | |
1249 | enum lttng_event_rule_status er_status; | |
1250 | enum lttng_domain_type domain; | |
1251 | const struct lttng_condition *condition; | |
1252 | const struct lttng_event_rule *rule; | |
1253 | const char *name; | |
1254 | const char *filter_expression; | |
85b05318 | 1255 | const struct lttng_log_level_rule *log_level_rule; |
44760c20 JR |
1256 | /* Unused when loglevel_type is 'ALL'. */ |
1257 | int loglevel_value = 0; | |
1258 | enum lttng_loglevel_type loglevel_type; | |
695f7044 JR |
1259 | event_rule_logging_get_name_pattern logging_get_name_pattern; |
1260 | event_rule_logging_get_log_level_rule logging_get_log_level_rule; | |
44760c20 | 1261 | |
a0377dfe FD |
1262 | LTTNG_ASSERT(agt); |
1263 | LTTNG_ASSERT(agt->events); | |
44760c20 JR |
1264 | |
1265 | condition = lttng_trigger_get_const_condition(trigger); | |
1266 | ||
a0377dfe | 1267 | LTTNG_ASSERT(lttng_condition_get_type(condition) == |
8dbb86b8 | 1268 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); |
44760c20 | 1269 | |
8dbb86b8 JR |
1270 | c_status = lttng_condition_event_rule_matches_get_rule( |
1271 | condition, &rule); | |
a0377dfe | 1272 | LTTNG_ASSERT(c_status == LTTNG_CONDITION_STATUS_OK); |
44760c20 | 1273 | |
695f7044 JR |
1274 | switch (lttng_event_rule_get_type(rule)) { |
1275 | case LTTNG_EVENT_RULE_TYPE_JUL_LOGGING: | |
1276 | logging_get_name_pattern = | |
1277 | lttng_event_rule_jul_logging_get_name_pattern; | |
1278 | logging_get_log_level_rule = | |
1279 | lttng_event_rule_jul_logging_get_log_level_rule; | |
1280 | break; | |
1281 | case LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING: | |
1282 | logging_get_name_pattern = | |
1283 | lttng_event_rule_log4j_logging_get_name_pattern; | |
1284 | logging_get_log_level_rule = | |
1285 | lttng_event_rule_log4j_logging_get_log_level_rule; | |
1286 | break; | |
1287 | case LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING: | |
1288 | logging_get_name_pattern = | |
1289 | lttng_event_rule_python_logging_get_name_pattern; | |
1290 | logging_get_log_level_rule = | |
1291 | lttng_event_rule_python_logging_get_log_level_rule; | |
1292 | break; | |
1293 | default: | |
1294 | abort(); | |
1295 | break; | |
1296 | } | |
44760c20 JR |
1297 | |
1298 | domain = lttng_event_rule_get_domain_type(rule); | |
a0377dfe | 1299 | LTTNG_ASSERT(domain == LTTNG_DOMAIN_JUL || domain == LTTNG_DOMAIN_LOG4J || |
44760c20 JR |
1300 | domain == LTTNG_DOMAIN_PYTHON); |
1301 | ||
8bc73626 | 1302 | /* Get the event's pattern name ('name' in the legacy terminology). */ |
695f7044 | 1303 | er_status = logging_get_name_pattern(rule, &name); |
a0377dfe | 1304 | LTTNG_ASSERT(er_status == LTTNG_EVENT_RULE_STATUS_OK); |
44760c20 JR |
1305 | |
1306 | /* Get the internal filter expression. */ | |
1307 | filter_expression = lttng_event_rule_get_filter(rule); | |
1308 | ||
85b05318 | 1309 | /* Map log_level_rule to loglevel value. */ |
695f7044 | 1310 | er_status = logging_get_log_level_rule(rule, &log_level_rule); |
85b05318 JR |
1311 | if (er_status == LTTNG_EVENT_RULE_STATUS_UNSET) { |
1312 | loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; | |
1313 | loglevel_value = 0; | |
1314 | } else if (er_status == LTTNG_EVENT_RULE_STATUS_OK) { | |
1315 | lttng_log_level_rule_to_loglevel(log_level_rule, &loglevel_type, &loglevel_value); | |
1316 | } else { | |
1317 | abort(); | |
44760c20 JR |
1318 | } |
1319 | ||
1320 | return agent_find_event(name, loglevel_type, loglevel_value, | |
1321 | filter_expression, agt); | |
1322 | } | |
1323 | ||
e261a6cc PP |
1324 | /* |
1325 | * Get the next agent event duplicate by name. This should be called | |
1326 | * after a call to agent_find_events_by_name() to iterate on events. | |
1327 | * | |
1328 | * The RCU read lock must be held during the iteration and for as long | |
1329 | * as the object the iterator points to remains in use. | |
1330 | */ | |
1331 | void agent_event_next_duplicate(const char *name, | |
1332 | struct agent *agt, struct lttng_ht_iter* iter) | |
1333 | { | |
1334 | struct agent_ht_key key; | |
4a4ab2c3 | 1335 | |
e261a6cc PP |
1336 | key.name = name; |
1337 | ||
1338 | cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name, | |
1339 | &key, &iter->iter); | |
4a4ab2c3 DG |
1340 | } |
1341 | ||
1342 | /* | |
6b10b3b0 | 1343 | * Find a agent event in the given agent using name, loglevel and filter. |
0475c50c | 1344 | * |
1e17eae2 JG |
1345 | * RCU read side lock MUST be acquired. It must be kept for as long as |
1346 | * the returned agent_event is used. | |
0475c50c DG |
1347 | * |
1348 | * Return object if found else NULL. | |
1349 | */ | |
a9319624 | 1350 | struct agent_event *agent_find_event(const char *name, |
44760c20 JR |
1351 | enum lttng_loglevel_type loglevel_type, |
1352 | int loglevel_value, | |
1353 | const char *filter_expression, | |
1354 | struct agent *agt) | |
0475c50c DG |
1355 | { |
1356 | struct lttng_ht_node_str *node; | |
1357 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 1358 | struct lttng_ht *ht; |
022d91ba | 1359 | struct agent_ht_key key; |
0475c50c | 1360 | |
a0377dfe FD |
1361 | LTTNG_ASSERT(name); |
1362 | LTTNG_ASSERT(agt); | |
1363 | LTTNG_ASSERT(agt->events); | |
0475c50c | 1364 | |
022d91ba | 1365 | ht = agt->events; |
4a4ab2c3 | 1366 | key.name = name; |
2106efa0 | 1367 | key.loglevel_value = loglevel_value; |
a9319624 | 1368 | key.loglevel_type = loglevel_type; |
6b10b3b0 | 1369 | key.filter_expression = filter_expression; |
4a4ab2c3 DG |
1370 | |
1371 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1372 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
1373 | node = lttng_ht_iter_get_node_str(&iter); |
1374 | if (node == NULL) { | |
1375 | goto error; | |
1376 | } | |
1377 | ||
022d91ba DG |
1378 | DBG3("Agent event found %s.", name); |
1379 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
1380 | |
1381 | error: | |
a51e817b | 1382 | DBG3("Agent event NOT found %s.", name); |
0475c50c DG |
1383 | return NULL; |
1384 | } | |
1385 | ||
0475c50c | 1386 | /* |
022d91ba DG |
1387 | * Free given agent event. This event must not be globally visible at this |
1388 | * point (only expected to be used on failure just after event creation). After | |
1389 | * this call, the pointer is not usable anymore. | |
0475c50c | 1390 | */ |
022d91ba | 1391 | void agent_destroy_event(struct agent_event *event) |
0475c50c | 1392 | { |
a0377dfe | 1393 | LTTNG_ASSERT(event); |
0475c50c | 1394 | |
971da06a | 1395 | free(event->filter); |
8404118c | 1396 | free(event->filter_expression); |
51755dc8 | 1397 | free(event->exclusion); |
0475c50c DG |
1398 | free(event); |
1399 | } | |
1400 | ||
bdf64013 JG |
1401 | static |
1402 | void destroy_app_ctx_rcu(struct rcu_head *head) | |
1403 | { | |
1404 | struct agent_app_ctx *ctx = | |
1405 | caa_container_of(head, struct agent_app_ctx, rcu_node); | |
1406 | ||
1407 | destroy_app_ctx(ctx); | |
1408 | } | |
1409 | ||
0475c50c | 1410 | /* |
35ed21a5 | 1411 | * Destroy an agent completely. |
0475c50c | 1412 | */ |
022d91ba | 1413 | void agent_destroy(struct agent *agt) |
0475c50c DG |
1414 | { |
1415 | struct lttng_ht_node_str *node; | |
1416 | struct lttng_ht_iter iter; | |
bdf64013 | 1417 | struct agent_app_ctx *ctx; |
0475c50c | 1418 | |
a0377dfe | 1419 | LTTNG_ASSERT(agt); |
0475c50c | 1420 | |
022d91ba | 1421 | DBG3("Agent destroy"); |
0475c50c | 1422 | |
0475c50c | 1423 | rcu_read_lock(); |
022d91ba | 1424 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 1425 | int ret; |
022d91ba | 1426 | struct agent_event *event; |
29c0fd4d DG |
1427 | |
1428 | /* | |
bdf64013 JG |
1429 | * When destroying an event, we have to try to disable it on the |
1430 | * agent side so the event stops generating data. The return | |
1431 | * value is not important since we have to continue anyway | |
1432 | * destroying the object. | |
29c0fd4d | 1433 | */ |
022d91ba DG |
1434 | event = caa_container_of(node, struct agent_event, node); |
1435 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 1436 | |
022d91ba | 1437 | ret = lttng_ht_del(agt->events, &iter); |
a0377dfe | 1438 | LTTNG_ASSERT(!ret); |
022d91ba | 1439 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c | 1440 | } |
0475c50c | 1441 | |
bdf64013 JG |
1442 | cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) { |
1443 | (void) disable_context(ctx, agt->domain); | |
1444 | cds_list_del(&ctx->list_node); | |
1445 | call_rcu(&ctx->rcu_node, destroy_app_ctx_rcu); | |
1446 | } | |
1447 | rcu_read_unlock(); | |
f8be902b | 1448 | ht_cleanup_push(agt->events); |
35ed21a5 | 1449 | free(agt); |
f20baf8e DG |
1450 | } |
1451 | ||
1452 | /* | |
6a4e4039 | 1453 | * Allocate agent_apps_ht_by_sock. |
f20baf8e | 1454 | */ |
6a4e4039 | 1455 | int agent_app_ht_alloc(void) |
f20baf8e | 1456 | { |
412d7227 SM |
1457 | the_agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1458 | return the_agent_apps_ht_by_sock ? 0 : -1; | |
6a4e4039 JG |
1459 | } |
1460 | ||
1461 | /* | |
1462 | * Destroy a agent application by socket. | |
1463 | */ | |
1464 | void agent_destroy_app_by_sock(int sock) | |
1465 | { | |
1466 | struct agent_app *app; | |
1467 | ||
a0377dfe | 1468 | LTTNG_ASSERT(sock >= 0); |
6a4e4039 JG |
1469 | |
1470 | /* | |
1471 | * Not finding an application is a very important error that should NEVER | |
1472 | * happen. The hash table deletion is ONLY done through this call when the | |
1473 | * main sessiond thread is torn down. | |
1474 | */ | |
1475 | rcu_read_lock(); | |
1476 | app = agent_find_app_by_sock(sock); | |
a0377dfe | 1477 | LTTNG_ASSERT(app); |
6a4e4039 JG |
1478 | |
1479 | /* RCU read side lock is assumed to be held by this function. */ | |
1480 | agent_delete_app(app); | |
1481 | ||
1482 | /* The application is freed in a RCU call but the socket is closed here. */ | |
1483 | agent_destroy_app(app); | |
1484 | rcu_read_unlock(); | |
1485 | } | |
1486 | ||
1487 | /* | |
1488 | * Clean-up the agent app hash table and destroy it. | |
1489 | */ | |
1490 | void agent_app_ht_clean(void) | |
1491 | { | |
1492 | struct lttng_ht_node_ulong *node; | |
1493 | struct lttng_ht_iter iter; | |
1494 | ||
412d7227 | 1495 | if (!the_agent_apps_ht_by_sock) { |
a433283e JG |
1496 | return; |
1497 | } | |
6a4e4039 | 1498 | rcu_read_lock(); |
412d7227 SM |
1499 | cds_lfht_for_each_entry( |
1500 | the_agent_apps_ht_by_sock->ht, &iter.iter, node, node) { | |
6a4e4039 JG |
1501 | struct agent_app *app; |
1502 | ||
1503 | app = caa_container_of(node, struct agent_app, node); | |
1504 | agent_destroy_app_by_sock(app->sock->fd); | |
1505 | } | |
1506 | rcu_read_unlock(); | |
1507 | ||
412d7227 | 1508 | lttng_ht_destroy(the_agent_apps_ht_by_sock); |
f20baf8e DG |
1509 | } |
1510 | ||
1511 | /* | |
022d91ba | 1512 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
1513 | * |
1514 | * Note that this function is most likely to be used with a tracing session | |
1515 | * thus the caller should make sure to hold the appropriate lock(s). | |
1516 | */ | |
733c9165 | 1517 | void agent_update(const struct agent *agt, const struct agent_app *app) |
f20baf8e DG |
1518 | { |
1519 | int ret; | |
022d91ba | 1520 | struct agent_event *event; |
f20baf8e | 1521 | struct lttng_ht_iter iter; |
bdf64013 | 1522 | struct agent_app_ctx *ctx; |
f20baf8e | 1523 | |
a0377dfe FD |
1524 | LTTNG_ASSERT(agt); |
1525 | LTTNG_ASSERT(app); | |
f20baf8e | 1526 | |
733c9165 | 1527 | DBG("Agent updating app: pid = %ld", (long) app->pid); |
f20baf8e DG |
1528 | |
1529 | rcu_read_lock(); | |
bdf64013 JG |
1530 | /* |
1531 | * We are in the registration path thus if the application is gone, | |
1532 | * there is a serious code flow error. | |
1533 | */ | |
733c9165 | 1534 | |
022d91ba | 1535 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e | 1536 | /* Skip event if disabled. */ |
44760c20 | 1537 | if (!AGENT_EVENT_IS_ENABLED(event)) { |
f20baf8e DG |
1538 | continue; |
1539 | } | |
1540 | ||
f20baf8e DG |
1541 | ret = enable_event(app, event); |
1542 | if (ret != LTTNG_OK) { | |
022d91ba | 1543 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
1544 | event->name, app->pid, app->sock->fd); |
1545 | /* Let's try the others here and don't assume the app is dead. */ | |
1546 | continue; | |
1547 | } | |
1548 | } | |
bdf64013 JG |
1549 | |
1550 | cds_list_for_each_entry_rcu(ctx, &agt->app_ctx_list, list_node) { | |
1551 | ret = app_context_op(app, ctx, AGENT_CMD_APP_CTX_ENABLE); | |
1552 | if (ret != LTTNG_OK) { | |
1553 | DBG2("Agent update unable to add application context %s:%s on app pid: %d sock %d", | |
1554 | ctx->provider_name, ctx->ctx_name, | |
1555 | app->pid, app->sock->fd); | |
1556 | continue; | |
1557 | } | |
1558 | } | |
1559 | ||
f20baf8e | 1560 | rcu_read_unlock(); |
0475c50c | 1561 | } |
44760c20 JR |
1562 | |
1563 | /* | |
1564 | * Allocate the per-event notifier domain agent hash table. It is lazily | |
1565 | * populated as domains are used. | |
1566 | */ | |
1567 | int agent_by_event_notifier_domain_ht_create(void) | |
1568 | { | |
412d7227 SM |
1569 | the_trigger_agents_ht_by_domain = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
1570 | return the_trigger_agents_ht_by_domain ? 0 : -1; | |
44760c20 JR |
1571 | } |
1572 | ||
1573 | /* | |
1574 | * Clean-up the per-event notifier domain agent hash table and destroy it. | |
1575 | */ | |
1576 | void agent_by_event_notifier_domain_ht_destroy(void) | |
1577 | { | |
1578 | struct lttng_ht_node_u64 *node; | |
1579 | struct lttng_ht_iter iter; | |
1580 | ||
412d7227 | 1581 | if (!the_trigger_agents_ht_by_domain) { |
44760c20 JR |
1582 | return; |
1583 | } | |
1584 | ||
1585 | rcu_read_lock(); | |
412d7227 SM |
1586 | cds_lfht_for_each_entry(the_trigger_agents_ht_by_domain->ht, |
1587 | &iter.iter, node, node) { | |
44760c20 JR |
1588 | struct agent *agent = |
1589 | caa_container_of(node, struct agent, node); | |
1590 | const int ret = lttng_ht_del( | |
412d7227 | 1591 | the_trigger_agents_ht_by_domain, &iter); |
44760c20 | 1592 | |
a0377dfe | 1593 | LTTNG_ASSERT(ret == 0); |
44760c20 JR |
1594 | agent_destroy(agent); |
1595 | } | |
1596 | ||
1597 | rcu_read_unlock(); | |
412d7227 | 1598 | lttng_ht_destroy(the_trigger_agents_ht_by_domain); |
44760c20 JR |
1599 | } |
1600 | ||
1601 | struct agent *agent_find_by_event_notifier_domain( | |
1602 | enum lttng_domain_type domain_type) | |
1603 | { | |
1604 | struct agent *agt = NULL; | |
1605 | struct lttng_ht_node_u64 *node; | |
1606 | struct lttng_ht_iter iter; | |
1607 | const uint64_t key = (uint64_t) domain_type; | |
1608 | ||
a0377dfe | 1609 | LTTNG_ASSERT(the_trigger_agents_ht_by_domain); |
44760c20 JR |
1610 | |
1611 | DBG3("Per-event notifier domain agent lookup for domain '%s'", | |
1612 | lttng_domain_type_str(domain_type)); | |
1613 | ||
412d7227 | 1614 | lttng_ht_lookup(the_trigger_agents_ht_by_domain, &key, &iter); |
44760c20 JR |
1615 | node = lttng_ht_iter_get_node_u64(&iter); |
1616 | if (!node) { | |
1617 | goto end; | |
1618 | } | |
1619 | ||
1620 | agt = caa_container_of(node, struct agent, node); | |
1621 | ||
1622 | end: | |
1623 | return agt; | |
1624 | } |