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 | ||
18 | #define _GNU_SOURCE | |
6c1c0768 | 19 | #define _LGPL_SOURCE |
0475c50c | 20 | #include <assert.h> |
f20baf8e | 21 | #include <urcu/uatomic.h> |
0475c50c DG |
22 | |
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 DG |
30 | #include "utils.h" |
31 | ||
4a4ab2c3 DG |
32 | /* |
33 | * Match function for the events hash table lookup by name. | |
34 | */ | |
35 | static int ht_match_event_by_name(struct cds_lfht_node *node, | |
36 | const void *_key) | |
37 | { | |
022d91ba DG |
38 | struct agent_event *event; |
39 | const struct agent_ht_key *key; | |
4a4ab2c3 DG |
40 | |
41 | assert(node); | |
42 | assert(_key); | |
43 | ||
022d91ba | 44 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
45 | key = _key; |
46 | ||
47 | /* Match 1 elements of the key: name. */ | |
48 | ||
49 | /* Event name */ | |
50 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
51 | goto no_match; | |
52 | } | |
53 | /* Match. */ | |
54 | return 1; | |
55 | ||
56 | no_match: | |
57 | return 0; | |
58 | } | |
59 | ||
60 | /* | |
61 | * Match function for the events hash table lookup by name and loglevel. | |
62 | */ | |
63 | static int ht_match_event(struct cds_lfht_node *node, | |
64 | const void *_key) | |
65 | { | |
022d91ba DG |
66 | struct agent_event *event; |
67 | const struct agent_ht_key *key; | |
36c63cc4 | 68 | int ll_match; |
4a4ab2c3 DG |
69 | |
70 | assert(node); | |
71 | assert(_key); | |
72 | ||
022d91ba | 73 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
74 | key = _key; |
75 | ||
76 | /* Match 2 elements of the key: name and loglevel. */ | |
77 | ||
78 | /* Event name */ | |
79 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
80 | goto no_match; | |
81 | } | |
82 | ||
15f57f85 | 83 | /* Event loglevel value and type. */ |
36c63cc4 PP |
84 | ll_match = loglevels_match(event->loglevel_type, |
85 | event->loglevel_value, key->loglevel_type, | |
86 | key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL); | |
87 | ||
88 | if (!ll_match) { | |
4a4ab2c3 DG |
89 | goto no_match; |
90 | } | |
15f57f85 | 91 | |
ade8d7e3 | 92 | /* Filter expression */ |
65555e50 PP |
93 | if (!!event->filter_expression ^ !!key->filter_expression) { |
94 | /* One has a filter expression, the other does not */ | |
ade8d7e3 AM |
95 | goto no_match; |
96 | } | |
97 | ||
65555e50 PP |
98 | if (event->filter_expression) { |
99 | if (strncmp(event->filter_expression, key->filter_expression, | |
100 | strlen(event->filter_expression)) != 0) { | |
101 | goto no_match; | |
102 | } | |
103 | } | |
104 | ||
4a4ab2c3 DG |
105 | return 1; |
106 | ||
107 | no_match: | |
108 | return 0; | |
109 | } | |
110 | ||
111 | /* | |
022d91ba | 112 | * Add unique agent event based on the event name and loglevel. |
4a4ab2c3 | 113 | */ |
022d91ba DG |
114 | static void add_unique_agent_event(struct lttng_ht *ht, |
115 | struct agent_event *event) | |
4a4ab2c3 DG |
116 | { |
117 | struct cds_lfht_node *node_ptr; | |
022d91ba | 118 | struct agent_ht_key key; |
4a4ab2c3 DG |
119 | |
120 | assert(ht); | |
121 | assert(ht->ht); | |
122 | assert(event); | |
123 | ||
124 | key.name = event->name; | |
79a065a0 | 125 | key.loglevel_value = event->loglevel_value; |
15f57f85 | 126 | key.loglevel_type = event->loglevel_type; |
ade8d7e3 | 127 | key.filter_expression = event->filter_expression; |
4a4ab2c3 DG |
128 | |
129 | node_ptr = cds_lfht_add_unique(ht->ht, | |
130 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
131 | ht_match_event, &key, &event->node.node); | |
132 | assert(node_ptr == &event->node.node); | |
133 | } | |
134 | ||
0475c50c | 135 | /* |
022d91ba | 136 | * URCU delayed agent event reclaim. |
0475c50c | 137 | */ |
022d91ba | 138 | static void destroy_event_agent_rcu(struct rcu_head *head) |
0475c50c DG |
139 | { |
140 | struct lttng_ht_node_str *node = | |
141 | caa_container_of(head, struct lttng_ht_node_str, head); | |
022d91ba DG |
142 | struct agent_event *event = |
143 | caa_container_of(node, struct agent_event, node); | |
0475c50c | 144 | |
b7478632 | 145 | agent_destroy_event(event); |
0475c50c DG |
146 | } |
147 | ||
f20baf8e | 148 | /* |
022d91ba | 149 | * URCU delayed agent app reclaim. |
f20baf8e | 150 | */ |
022d91ba | 151 | static void destroy_app_agent_rcu(struct rcu_head *head) |
f20baf8e DG |
152 | { |
153 | struct lttng_ht_node_ulong *node = | |
154 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
022d91ba DG |
155 | struct agent_app *app = |
156 | caa_container_of(node, struct agent_app, node); | |
f20baf8e DG |
157 | |
158 | free(app); | |
159 | } | |
160 | ||
161 | /* | |
022d91ba DG |
162 | * Communication with the agent. Send the message header to the given socket in |
163 | * big endian. | |
f20baf8e DG |
164 | * |
165 | * Return 0 on success or else a negative errno message of sendmsg() op. | |
166 | */ | |
167 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, | |
168 | uint32_t cmd, uint32_t cmd_version) | |
169 | { | |
170 | int ret; | |
171 | ssize_t size; | |
022d91ba | 172 | struct lttcomm_agent_hdr msg; |
f20baf8e DG |
173 | |
174 | assert(sock); | |
175 | ||
53efb85a | 176 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
177 | msg.data_size = htobe64(data_size); |
178 | msg.cmd = htobe32(cmd); | |
179 | msg.cmd_version = htobe32(cmd_version); | |
180 | ||
181 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
182 | if (size < sizeof(msg)) { | |
183 | ret = -errno; | |
184 | goto error; | |
185 | } | |
186 | ret = 0; | |
187 | ||
188 | error: | |
189 | return ret; | |
190 | } | |
191 | ||
192 | /* | |
022d91ba DG |
193 | * Communication call with the agent. Send the payload to the given socket. The |
194 | * header MUST be sent prior to this call. | |
f20baf8e DG |
195 | * |
196 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
197 | */ | |
198 | static int send_payload(struct lttcomm_sock *sock, void *data, | |
199 | size_t size) | |
200 | { | |
201 | int ret; | |
202 | ssize_t len; | |
203 | ||
204 | assert(sock); | |
205 | assert(data); | |
206 | ||
207 | len = sock->ops->sendmsg(sock, data, size, 0); | |
208 | if (len < size) { | |
209 | ret = -errno; | |
210 | goto error; | |
211 | } | |
212 | ret = 0; | |
213 | ||
214 | error: | |
215 | return ret; | |
216 | } | |
217 | ||
218 | /* | |
022d91ba DG |
219 | * Communication call with the agent. Receive reply from the agent using the |
220 | * given socket. | |
f20baf8e DG |
221 | * |
222 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
223 | */ | |
224 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
225 | { | |
226 | int ret; | |
227 | ssize_t len; | |
228 | ||
229 | assert(sock); | |
230 | assert(buf); | |
231 | ||
232 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
233 | if (len < size) { | |
234 | ret = -errno; | |
235 | goto error; | |
236 | } | |
237 | ret = 0; | |
238 | ||
239 | error: | |
240 | return ret; | |
241 | } | |
242 | ||
3c6a091f | 243 | /* |
428de77a | 244 | * Internal event listing for a given app. Populate events. |
3c6a091f DG |
245 | * |
246 | * Return number of element in the list or else a negative LTTNG_ERR* code. | |
428de77a MD |
247 | * On success, the caller is responsible for freeing the memory |
248 | * allocated for "events". | |
3c6a091f | 249 | */ |
022d91ba | 250 | static ssize_t list_events(struct agent_app *app, struct lttng_event **events) |
3c6a091f DG |
251 | { |
252 | int ret, i, len = 0, offset = 0; | |
253 | uint32_t nb_event; | |
254 | size_t data_size; | |
255 | struct lttng_event *tmp_events = NULL; | |
022d91ba DG |
256 | struct lttcomm_agent_list_reply *reply = NULL; |
257 | struct lttcomm_agent_list_reply_hdr reply_hdr; | |
3c6a091f DG |
258 | |
259 | assert(app); | |
260 | assert(app->sock); | |
261 | assert(events); | |
262 | ||
022d91ba | 263 | DBG2("Agent listing events for app pid: %d and socket %d", app->pid, |
3c6a091f DG |
264 | app->sock->fd); |
265 | ||
022d91ba | 266 | ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0); |
3c6a091f DG |
267 | if (ret < 0) { |
268 | goto error_io; | |
269 | } | |
270 | ||
271 | /* Get list header so we know how much we'll receive. */ | |
272 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); | |
273 | if (ret < 0) { | |
274 | goto error_io; | |
275 | } | |
276 | ||
277 | switch (be32toh(reply_hdr.ret_code)) { | |
022d91ba | 278 | case AGENT_RET_CODE_SUCCESS: |
3c6a091f DG |
279 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
280 | break; | |
281 | default: | |
022d91ba | 282 | ERR("Agent returned an unknown code: %" PRIu32, |
3c6a091f DG |
283 | be32toh(reply_hdr.ret_code)); |
284 | ret = LTTNG_ERR_FATAL; | |
285 | goto error; | |
286 | } | |
287 | ||
288 | reply = zmalloc(data_size); | |
289 | if (!reply) { | |
290 | ret = LTTNG_ERR_NOMEM; | |
291 | goto error; | |
292 | } | |
293 | ||
294 | /* Get the list with the appropriate data size. */ | |
295 | ret = recv_reply(app->sock, reply, data_size); | |
296 | if (ret < 0) { | |
297 | goto error_io; | |
298 | } | |
299 | ||
300 | nb_event = be32toh(reply->nb_event); | |
301 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); | |
302 | if (!tmp_events) { | |
303 | ret = LTTNG_ERR_NOMEM; | |
304 | goto error; | |
305 | } | |
306 | ||
307 | for (i = 0; i < nb_event; i++) { | |
308 | offset += len; | |
34441a16 MD |
309 | if (lttng_strncpy(tmp_events[i].name, reply->payload + offset, |
310 | sizeof(tmp_events[i].name))) { | |
311 | ret = LTTNG_ERR_INVALID; | |
312 | goto error; | |
313 | } | |
3c6a091f DG |
314 | tmp_events[i].pid = app->pid; |
315 | tmp_events[i].enabled = -1; | |
316 | len = strlen(reply->payload + offset) + 1; | |
317 | } | |
318 | ||
319 | *events = tmp_events; | |
320 | ||
321 | free(reply); | |
322 | return nb_event; | |
323 | ||
324 | error_io: | |
325 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
326 | error: | |
327 | free(reply); | |
328 | free(tmp_events); | |
329 | return -ret; | |
330 | ||
331 | } | |
332 | ||
f20baf8e | 333 | /* |
022d91ba DG |
334 | * Internal enable agent event on a agent application. This function |
335 | * communicates with the agent to enable a given event. | |
f20baf8e DG |
336 | * |
337 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
338 | */ | |
022d91ba | 339 | static int enable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
340 | { |
341 | int ret; | |
342 | uint64_t data_size; | |
022d91ba DG |
343 | struct lttcomm_agent_enable msg; |
344 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
345 | |
346 | assert(app); | |
347 | assert(app->sock); | |
348 | assert(event); | |
349 | ||
022d91ba | 350 | DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
351 | app->pid, app->sock->fd); |
352 | ||
353 | data_size = sizeof(msg); | |
354 | ||
022d91ba | 355 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
f20baf8e DG |
356 | if (ret < 0) { |
357 | goto error_io; | |
358 | } | |
359 | ||
53efb85a | 360 | memset(&msg, 0, sizeof(msg)); |
79a065a0 | 361 | msg.loglevel_value = event->loglevel_value; |
b2064f54 | 362 | msg.loglevel_type = event->loglevel_type; |
f20baf8e DG |
363 | strncpy(msg.name, event->name, sizeof(msg.name)); |
364 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
365 | if (ret < 0) { | |
366 | goto error_io; | |
367 | } | |
368 | ||
369 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
370 | if (ret < 0) { | |
371 | goto error_io; | |
372 | } | |
373 | ||
374 | switch (be32toh(reply.ret_code)) { | |
022d91ba | 375 | case AGENT_RET_CODE_SUCCESS: |
f20baf8e | 376 | break; |
022d91ba | 377 | case AGENT_RET_CODE_UNKNOWN_NAME: |
f20baf8e DG |
378 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
379 | goto error; | |
380 | default: | |
022d91ba | 381 | ERR("Agent returned an unknown code: %" PRIu32, |
f20baf8e DG |
382 | be32toh(reply.ret_code)); |
383 | ret = LTTNG_ERR_FATAL; | |
384 | goto error; | |
385 | } | |
386 | ||
387 | return LTTNG_OK; | |
388 | ||
389 | error_io: | |
390 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
391 | error: | |
392 | return ret; | |
393 | } | |
394 | ||
395 | /* | |
022d91ba DG |
396 | * Internal disable agent event call on a agent application. This function |
397 | * communicates with the agent to disable a given event. | |
f20baf8e DG |
398 | * |
399 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
400 | */ | |
022d91ba | 401 | static int disable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
402 | { |
403 | int ret; | |
404 | uint64_t data_size; | |
022d91ba DG |
405 | struct lttcomm_agent_disable msg; |
406 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
407 | |
408 | assert(app); | |
409 | assert(app->sock); | |
410 | assert(event); | |
411 | ||
022d91ba | 412 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
413 | app->pid, app->sock->fd); |
414 | ||
415 | data_size = sizeof(msg); | |
1de8c2e7 MD |
416 | memset(&msg, 0, sizeof(msg)); |
417 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { | |
418 | ret = LTTNG_ERR_INVALID; | |
419 | goto error; | |
420 | } | |
f20baf8e | 421 | |
022d91ba | 422 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
f20baf8e DG |
423 | if (ret < 0) { |
424 | goto error_io; | |
425 | } | |
426 | ||
f20baf8e DG |
427 | ret = send_payload(app->sock, &msg, sizeof(msg)); |
428 | if (ret < 0) { | |
429 | goto error_io; | |
430 | } | |
431 | ||
432 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
433 | if (ret < 0) { | |
434 | goto error_io; | |
435 | } | |
436 | ||
437 | switch (be32toh(reply.ret_code)) { | |
022d91ba DG |
438 | case AGENT_RET_CODE_SUCCESS: |
439 | break; | |
440 | case AGENT_RET_CODE_UNKNOWN_NAME: | |
441 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
442 | goto error; | |
443 | default: | |
444 | ERR("Agent returned an unknown code: %" PRIu32, | |
445 | be32toh(reply.ret_code)); | |
446 | ret = LTTNG_ERR_FATAL; | |
447 | goto error; | |
f20baf8e DG |
448 | } |
449 | ||
450 | return LTTNG_OK; | |
451 | ||
452 | error_io: | |
453 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
454 | error: | |
455 | return ret; | |
456 | } | |
457 | ||
1b500e7a | 458 | /* |
022d91ba | 459 | * Send back the registration DONE command to a given agent application. |
1b500e7a DG |
460 | * |
461 | * Return 0 on success or else a negative value. | |
462 | */ | |
022d91ba | 463 | int agent_send_registration_done(struct agent_app *app) |
1b500e7a DG |
464 | { |
465 | assert(app); | |
466 | assert(app->sock); | |
467 | ||
022d91ba | 468 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
1b500e7a | 469 | |
7460a4a9 | 470 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0); |
1b500e7a DG |
471 | } |
472 | ||
f20baf8e | 473 | /* |
022d91ba | 474 | * Enable agent event on every agent applications registered with the session |
f20baf8e DG |
475 | * daemon. |
476 | * | |
477 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
478 | */ | |
fefd409b DG |
479 | int agent_enable_event(struct agent_event *event, |
480 | enum lttng_domain_type domain) | |
f20baf8e DG |
481 | { |
482 | int ret; | |
022d91ba | 483 | struct agent_app *app; |
f20baf8e DG |
484 | struct lttng_ht_iter iter; |
485 | ||
486 | assert(event); | |
487 | ||
488 | rcu_read_lock(); | |
489 | ||
022d91ba | 490 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 491 | node.node) { |
fefd409b DG |
492 | if (app->domain != domain) { |
493 | continue; | |
494 | } | |
495 | ||
022d91ba | 496 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
497 | ret = enable_event(app, event); |
498 | if (ret != LTTNG_OK) { | |
499 | goto error; | |
500 | } | |
f20baf8e DG |
501 | } |
502 | ||
3c6a091f | 503 | event->enabled = 1; |
f20baf8e DG |
504 | ret = LTTNG_OK; |
505 | ||
506 | error: | |
507 | rcu_read_unlock(); | |
508 | return ret; | |
509 | } | |
510 | ||
511 | /* | |
022d91ba | 512 | * Disable agent event on every agent applications registered with the session |
f20baf8e DG |
513 | * daemon. |
514 | * | |
515 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
516 | */ | |
fefd409b DG |
517 | int agent_disable_event(struct agent_event *event, |
518 | enum lttng_domain_type domain) | |
f20baf8e | 519 | { |
515a4169 | 520 | int ret = LTTNG_OK; |
022d91ba | 521 | struct agent_app *app; |
f20baf8e DG |
522 | struct lttng_ht_iter iter; |
523 | ||
524 | assert(event); | |
515a4169 JG |
525 | if (!event->enabled) { |
526 | goto end; | |
527 | } | |
f20baf8e DG |
528 | |
529 | rcu_read_lock(); | |
530 | ||
022d91ba | 531 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 532 | node.node) { |
fefd409b DG |
533 | if (app->domain != domain) { |
534 | continue; | |
535 | } | |
536 | ||
022d91ba | 537 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
538 | ret = disable_event(app, event); |
539 | if (ret != LTTNG_OK) { | |
540 | goto error; | |
541 | } | |
f20baf8e DG |
542 | } |
543 | ||
3c6a091f | 544 | event->enabled = 0; |
f20baf8e DG |
545 | |
546 | error: | |
547 | rcu_read_unlock(); | |
515a4169 | 548 | end: |
f20baf8e DG |
549 | return ret; |
550 | } | |
551 | ||
552 | /* | |
022d91ba DG |
553 | * Ask every agent for the list of possible event. Events is allocated with the |
554 | * events of every agent application. | |
f20baf8e DG |
555 | * |
556 | * Return the number of events or else a negative value. | |
557 | */ | |
f60140a1 DG |
558 | int agent_list_events(struct lttng_event **events, |
559 | enum lttng_domain_type domain) | |
f20baf8e DG |
560 | { |
561 | int ret; | |
562 | size_t nbmem, count = 0; | |
022d91ba | 563 | struct agent_app *app; |
aae6255e | 564 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
565 | struct lttng_ht_iter iter; |
566 | ||
567 | assert(events); | |
568 | ||
0e115563 DG |
569 | DBG2("Agent listing events for domain %d", domain); |
570 | ||
f20baf8e DG |
571 | nbmem = UST_APP_EVENT_LIST_SIZE; |
572 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
573 | if (!tmp_events) { | |
022d91ba | 574 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
575 | ret = -ENOMEM; |
576 | goto error; | |
577 | } | |
578 | ||
579 | rcu_read_lock(); | |
022d91ba | 580 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
581 | node.node) { |
582 | ssize_t nb_ev; | |
022d91ba | 583 | struct lttng_event *agent_events; |
f20baf8e | 584 | |
f60140a1 DG |
585 | /* Skip domain not asked by the list. */ |
586 | if (app->domain != domain) { | |
587 | continue; | |
588 | } | |
589 | ||
022d91ba | 590 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
591 | if (nb_ev < 0) { |
592 | ret = nb_ev; | |
428de77a | 593 | goto error_unlock; |
f20baf8e DG |
594 | } |
595 | ||
53efb85a | 596 | if (count + nb_ev > nbmem) { |
f20baf8e | 597 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
598 | struct lttng_event *new_tmp_events; |
599 | size_t new_nbmem; | |
600 | ||
601 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 602 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
603 | nbmem, new_nbmem); |
604 | new_tmp_events = realloc(tmp_events, | |
605 | new_nbmem * sizeof(*new_tmp_events)); | |
606 | if (!new_tmp_events) { | |
022d91ba | 607 | PERROR("realloc agent events"); |
f20baf8e | 608 | ret = -ENOMEM; |
022d91ba | 609 | free(agent_events); |
428de77a | 610 | goto error_unlock; |
f20baf8e | 611 | } |
53efb85a MD |
612 | /* Zero the new memory */ |
613 | memset(new_tmp_events + nbmem, 0, | |
614 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
615 | nbmem = new_nbmem; | |
616 | tmp_events = new_tmp_events; | |
f20baf8e | 617 | } |
022d91ba | 618 | memcpy(tmp_events + count, agent_events, |
53efb85a | 619 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 620 | free(agent_events); |
f20baf8e DG |
621 | count += nb_ev; |
622 | } | |
623 | rcu_read_unlock(); | |
624 | ||
625 | ret = count; | |
626 | *events = tmp_events; | |
aae6255e | 627 | return ret; |
f20baf8e | 628 | |
428de77a MD |
629 | error_unlock: |
630 | rcu_read_unlock(); | |
f20baf8e | 631 | error: |
aae6255e | 632 | free(tmp_events); |
f20baf8e DG |
633 | return ret; |
634 | } | |
635 | ||
636 | /* | |
022d91ba | 637 | * Create a agent app object using the given PID. |
f20baf8e DG |
638 | * |
639 | * Return newly allocated object or else NULL on error. | |
640 | */ | |
fefd409b DG |
641 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
642 | struct lttcomm_sock *sock) | |
f20baf8e | 643 | { |
022d91ba | 644 | struct agent_app *app; |
f20baf8e DG |
645 | |
646 | assert(sock); | |
647 | ||
648 | app = zmalloc(sizeof(*app)); | |
649 | if (!app) { | |
022d91ba | 650 | PERROR("zmalloc agent create"); |
f20baf8e DG |
651 | goto error; |
652 | } | |
653 | ||
654 | app->pid = pid; | |
fefd409b | 655 | app->domain = domain; |
f20baf8e | 656 | app->sock = sock; |
f20baf8e DG |
657 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
658 | ||
659 | error: | |
660 | return app; | |
661 | } | |
662 | ||
663 | /* | |
022d91ba | 664 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
665 | * |
666 | * RCU read side lock MUST be acquired. | |
667 | * | |
668 | * Return object if found else NULL. | |
669 | */ | |
022d91ba | 670 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
671 | { |
672 | struct lttng_ht_node_ulong *node; | |
673 | struct lttng_ht_iter iter; | |
022d91ba | 674 | struct agent_app *app; |
f20baf8e DG |
675 | |
676 | assert(sock >= 0); | |
677 | ||
022d91ba | 678 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
f20baf8e DG |
679 | node = lttng_ht_iter_get_node_ulong(&iter); |
680 | if (node == NULL) { | |
681 | goto error; | |
682 | } | |
022d91ba | 683 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 684 | |
022d91ba | 685 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
686 | return app; |
687 | ||
688 | error: | |
022d91ba | 689 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
690 | return NULL; |
691 | } | |
692 | ||
693 | /* | |
022d91ba | 694 | * Add agent application object to the global hash table. |
f20baf8e | 695 | */ |
022d91ba | 696 | void agent_add_app(struct agent_app *app) |
f20baf8e DG |
697 | { |
698 | assert(app); | |
699 | ||
022d91ba | 700 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
f20baf8e DG |
701 | |
702 | rcu_read_lock(); | |
022d91ba | 703 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
704 | rcu_read_unlock(); |
705 | } | |
706 | ||
f20baf8e | 707 | /* |
022d91ba | 708 | * Delete agent application from the global hash table. |
a0a9a2fe JG |
709 | * |
710 | * rcu_read_lock() must be held by the caller. | |
f20baf8e | 711 | */ |
022d91ba | 712 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
713 | { |
714 | int ret; | |
715 | struct lttng_ht_iter iter; | |
716 | ||
717 | assert(app); | |
718 | ||
022d91ba | 719 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
720 | |
721 | iter.iter.node = &app->node.node; | |
022d91ba | 722 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
f20baf8e DG |
723 | assert(!ret); |
724 | } | |
725 | ||
726 | /* | |
022d91ba DG |
727 | * Destroy a agent application object by detaching it from its corresponding |
728 | * UST app if one is connected by closing the socket. Finally, perform a | |
428de77a | 729 | * delayed memory reclaim. |
f20baf8e | 730 | */ |
022d91ba | 731 | void agent_destroy_app(struct agent_app *app) |
f20baf8e DG |
732 | { |
733 | assert(app); | |
734 | ||
735 | if (app->sock) { | |
736 | app->sock->ops->close(app->sock); | |
737 | lttcomm_destroy_sock(app->sock); | |
738 | } | |
739 | ||
022d91ba | 740 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
741 | } |
742 | ||
0475c50c | 743 | /* |
022d91ba | 744 | * Initialize an already allocated agent object. |
0475c50c DG |
745 | * |
746 | * Return 0 on success or else a negative errno value. | |
747 | */ | |
022d91ba | 748 | int agent_init(struct agent *agt) |
0475c50c DG |
749 | { |
750 | int ret; | |
751 | ||
022d91ba | 752 | assert(agt); |
0475c50c | 753 | |
022d91ba DG |
754 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
755 | if (!agt->events) { | |
0475c50c DG |
756 | ret = -ENOMEM; |
757 | goto error; | |
758 | } | |
fefd409b | 759 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
0475c50c DG |
760 | |
761 | return 0; | |
762 | ||
763 | error: | |
764 | return ret; | |
765 | } | |
766 | ||
fefd409b DG |
767 | /* |
768 | * Add agent object to the given hash table. | |
769 | */ | |
770 | void agent_add(struct agent *agt, struct lttng_ht *ht) | |
771 | { | |
772 | assert(agt); | |
773 | assert(ht); | |
774 | ||
775 | DBG3("Agent adding from domain %d", agt->domain); | |
776 | ||
777 | rcu_read_lock(); | |
778 | lttng_ht_add_unique_u64(ht, &agt->node); | |
779 | rcu_read_unlock(); | |
780 | } | |
781 | ||
782 | /* | |
783 | * Create an agent object for the given domain. | |
784 | * | |
785 | * Return the allocated agent or NULL on error. | |
786 | */ | |
787 | struct agent *agent_create(enum lttng_domain_type domain) | |
788 | { | |
789 | int ret; | |
790 | struct agent *agt; | |
791 | ||
792 | agt = zmalloc(sizeof(*agt)); | |
793 | if (!agt) { | |
794 | goto error; | |
795 | } | |
796 | agt->domain = domain; | |
797 | ||
798 | ret = agent_init(agt); | |
799 | if (ret < 0) { | |
800 | free(agt); | |
988ae332 | 801 | agt = NULL; |
fefd409b DG |
802 | goto error; |
803 | } | |
804 | ||
805 | error: | |
806 | return agt; | |
807 | } | |
808 | ||
0475c50c | 809 | /* |
0a3fca4d JG |
810 | * Create a newly allocated agent event data structure. |
811 | * Ownership of filter_expression is taken. | |
0475c50c DG |
812 | * |
813 | * Return a new object else NULL on error. | |
814 | */ | |
022d91ba | 815 | struct agent_event *agent_create_event(const char *name, |
15f57f85 | 816 | enum lttng_loglevel_type loglevel_type, int loglevel_value, |
0a3fca4d | 817 | struct lttng_filter_bytecode *filter, char *filter_expression) |
0475c50c | 818 | { |
0a3fca4d | 819 | struct agent_event *event = NULL; |
0475c50c | 820 | |
ade8d7e3 AM |
821 | DBG3("Agent create new event with name %s, loglevel type %d, \ |
822 | loglevel value %d and filter %s", | |
be8753bb JG |
823 | name, loglevel_type, loglevel_value, |
824 | filter_expression ? filter_expression : "NULL"); | |
0475c50c | 825 | |
0a3fca4d JG |
826 | if (!name) { |
827 | ERR("Failed to create agent event; no name provided."); | |
0475c50c DG |
828 | goto error; |
829 | } | |
830 | ||
0a3fca4d JG |
831 | event = zmalloc(sizeof(*event)); |
832 | if (!event) { | |
833 | goto error; | |
0475c50c DG |
834 | } |
835 | ||
0a3fca4d JG |
836 | strncpy(event->name, name, sizeof(event->name)); |
837 | event->name[sizeof(event->name) - 1] = '\0'; | |
838 | lttng_ht_node_init_str(&event->node, event->name); | |
be6a6276 | 839 | |
79a065a0 | 840 | event->loglevel_value = loglevel_value; |
0a3fca4d JG |
841 | event->loglevel_type = loglevel_type; |
842 | event->filter = filter; | |
843 | event->filter_expression = filter_expression; | |
0475c50c DG |
844 | error: |
845 | return event; | |
846 | } | |
847 | ||
848 | /* | |
022d91ba | 849 | * Unique add of a agent event to an agent object. |
0475c50c | 850 | */ |
022d91ba | 851 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c DG |
852 | { |
853 | assert(event); | |
022d91ba DG |
854 | assert(agt); |
855 | assert(agt->events); | |
0475c50c | 856 | |
022d91ba | 857 | DBG3("Agent adding event %s", event->name); |
0475c50c | 858 | |
f20baf8e | 859 | rcu_read_lock(); |
022d91ba | 860 | add_unique_agent_event(agt->events, event); |
f20baf8e | 861 | rcu_read_unlock(); |
022d91ba | 862 | agt->being_used = 1; |
0475c50c DG |
863 | } |
864 | ||
865 | /* | |
442a3c6e | 866 | * Find multiple agent events sharing the given name. |
4a4ab2c3 | 867 | * |
442a3c6e PP |
868 | * RCU read side lock MUST be acquired. It must be held for the |
869 | * duration of the iteration. | |
4a4ab2c3 | 870 | * |
442a3c6e | 871 | * Sets the given iterator. |
4a4ab2c3 | 872 | */ |
442a3c6e PP |
873 | void agent_find_events_by_name(const char *name, struct agent *agt, |
874 | struct lttng_ht_iter* iter) | |
4a4ab2c3 | 875 | { |
4a4ab2c3 | 876 | struct lttng_ht *ht; |
022d91ba | 877 | struct agent_ht_key key; |
4a4ab2c3 DG |
878 | |
879 | assert(name); | |
022d91ba DG |
880 | assert(agt); |
881 | assert(agt->events); | |
442a3c6e | 882 | assert(iter); |
4a4ab2c3 | 883 | |
022d91ba | 884 | ht = agt->events; |
4a4ab2c3 DG |
885 | key.name = name; |
886 | ||
887 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
442a3c6e PP |
888 | ht_match_event_by_name, &key, &iter->iter); |
889 | } | |
4a4ab2c3 | 890 | |
442a3c6e PP |
891 | /* |
892 | * Get the next agent event duplicate by name. This should be called | |
893 | * after a call to agent_find_events_by_name() to iterate on events. | |
894 | * | |
895 | * The RCU read lock must be held during the iteration and for as long | |
896 | * as the object the iterator points to remains in use. | |
897 | */ | |
898 | void agent_event_next_duplicate(const char *name, | |
899 | struct agent *agt, struct lttng_ht_iter* iter) | |
900 | { | |
901 | struct agent_ht_key key; | |
4a4ab2c3 | 902 | |
442a3c6e PP |
903 | key.name = name; |
904 | ||
905 | cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name, | |
906 | &key, &iter->iter); | |
4a4ab2c3 DG |
907 | } |
908 | ||
909 | /* | |
ade8d7e3 | 910 | * Find a agent event in the given agent using name, loglevel and filter. |
0475c50c DG |
911 | * |
912 | * RCU read side lock MUST be acquired. | |
913 | * | |
914 | * Return object if found else NULL. | |
915 | */ | |
15f57f85 PP |
916 | struct agent_event *agent_find_event(const char *name, |
917 | enum lttng_loglevel_type loglevel_type, int loglevel_value, | |
ade8d7e3 | 918 | char *filter_expression, struct agent *agt) |
0475c50c DG |
919 | { |
920 | struct lttng_ht_node_str *node; | |
921 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 922 | struct lttng_ht *ht; |
022d91ba | 923 | struct agent_ht_key key; |
0475c50c DG |
924 | |
925 | assert(name); | |
022d91ba DG |
926 | assert(agt); |
927 | assert(agt->events); | |
0475c50c | 928 | |
022d91ba | 929 | ht = agt->events; |
4a4ab2c3 | 930 | key.name = name; |
79a065a0 | 931 | key.loglevel_value = loglevel_value; |
15f57f85 | 932 | key.loglevel_type = loglevel_type; |
ade8d7e3 | 933 | key.filter_expression = filter_expression; |
4a4ab2c3 DG |
934 | |
935 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
936 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
937 | node = lttng_ht_iter_get_node_str(&iter); |
938 | if (node == NULL) { | |
939 | goto error; | |
940 | } | |
941 | ||
022d91ba DG |
942 | DBG3("Agent event found %s.", name); |
943 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
944 | |
945 | error: | |
cc102a6e | 946 | DBG3("Agent event NOT found %s.", name); |
0475c50c DG |
947 | return NULL; |
948 | } | |
949 | ||
0475c50c | 950 | /* |
022d91ba DG |
951 | * Free given agent event. This event must not be globally visible at this |
952 | * point (only expected to be used on failure just after event creation). After | |
953 | * this call, the pointer is not usable anymore. | |
0475c50c | 954 | */ |
022d91ba | 955 | void agent_destroy_event(struct agent_event *event) |
0475c50c DG |
956 | { |
957 | assert(event); | |
958 | ||
971da06a | 959 | free(event->filter); |
d75bffee | 960 | free(event->filter_expression); |
0a3fca4d | 961 | free(event->exclusion); |
0475c50c DG |
962 | free(event); |
963 | } | |
964 | ||
965 | /* | |
9fe73c3c | 966 | * Destroy an agent completely. |
0475c50c | 967 | */ |
022d91ba | 968 | void agent_destroy(struct agent *agt) |
0475c50c DG |
969 | { |
970 | struct lttng_ht_node_str *node; | |
971 | struct lttng_ht_iter iter; | |
972 | ||
022d91ba | 973 | assert(agt); |
0475c50c | 974 | |
022d91ba | 975 | DBG3("Agent destroy"); |
0475c50c DG |
976 | |
977 | /* | |
978 | * Just ignore if no events hash table exists. This is possible if for | |
022d91ba | 979 | * instance an agent object was allocated but not initialized. |
0475c50c | 980 | */ |
022d91ba | 981 | if (!agt->events) { |
0475c50c DG |
982 | return; |
983 | } | |
984 | ||
985 | rcu_read_lock(); | |
022d91ba | 986 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 987 | int ret; |
022d91ba | 988 | struct agent_event *event; |
29c0fd4d DG |
989 | |
990 | /* | |
991 | * When destroying an event, we have to try to disable it on the agent | |
992 | * side so the event stops generating data. The return value is not | |
993 | * important since we have to continue anyway destroying the object. | |
994 | */ | |
022d91ba DG |
995 | event = caa_container_of(node, struct agent_event, node); |
996 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 997 | |
022d91ba | 998 | ret = lttng_ht_del(agt->events, &iter); |
0475c50c | 999 | assert(!ret); |
022d91ba | 1000 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c DG |
1001 | } |
1002 | rcu_read_unlock(); | |
1003 | ||
f8be902b | 1004 | ht_cleanup_push(agt->events); |
9fe73c3c | 1005 | free(agt); |
f20baf8e DG |
1006 | } |
1007 | ||
1008 | /* | |
5642e70b | 1009 | * Allocate agent_apps_ht_by_sock. |
f20baf8e | 1010 | */ |
5642e70b | 1011 | int agent_app_ht_alloc(void) |
f20baf8e | 1012 | { |
5642e70b JG |
1013 | int ret = 0; |
1014 | ||
022d91ba DG |
1015 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1016 | if (!agent_apps_ht_by_sock) { | |
5642e70b | 1017 | ret = -1; |
f20baf8e DG |
1018 | } |
1019 | ||
5642e70b JG |
1020 | return ret; |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | * Destroy a agent application by socket. | |
1025 | */ | |
1026 | void agent_destroy_app_by_sock(int sock) | |
1027 | { | |
1028 | struct agent_app *app; | |
1029 | ||
1030 | assert(sock >= 0); | |
1031 | ||
1032 | /* | |
1033 | * Not finding an application is a very important error that should NEVER | |
1034 | * happen. The hash table deletion is ONLY done through this call when the | |
1035 | * main sessiond thread is torn down. | |
1036 | */ | |
1037 | rcu_read_lock(); | |
1038 | app = agent_find_app_by_sock(sock); | |
1039 | assert(app); | |
1040 | ||
1041 | /* RCU read side lock is assumed to be held by this function. */ | |
1042 | agent_delete_app(app); | |
1043 | ||
1044 | /* The application is freed in a RCU call but the socket is closed here. */ | |
1045 | agent_destroy_app(app); | |
1046 | rcu_read_unlock(); | |
1047 | } | |
1048 | ||
1049 | /* | |
1050 | * Clean-up the agent app hash table and destroy it. | |
1051 | */ | |
1052 | void agent_app_ht_clean(void) | |
1053 | { | |
1054 | struct lttng_ht_node_ulong *node; | |
1055 | struct lttng_ht_iter iter; | |
1056 | ||
77cdfc81 JG |
1057 | if (!agent_apps_ht_by_sock) { |
1058 | return; | |
1059 | } | |
5642e70b JG |
1060 | rcu_read_lock(); |
1061 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) { | |
1062 | struct agent_app *app; | |
1063 | ||
1064 | app = caa_container_of(node, struct agent_app, node); | |
1065 | agent_destroy_app_by_sock(app->sock->fd); | |
1066 | } | |
1067 | rcu_read_unlock(); | |
1068 | ||
1069 | lttng_ht_destroy(agent_apps_ht_by_sock); | |
f20baf8e DG |
1070 | } |
1071 | ||
1072 | /* | |
022d91ba | 1073 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
1074 | * |
1075 | * Note that this function is most likely to be used with a tracing session | |
1076 | * thus the caller should make sure to hold the appropriate lock(s). | |
1077 | */ | |
022d91ba | 1078 | void agent_update(struct agent *agt, int sock) |
f20baf8e DG |
1079 | { |
1080 | int ret; | |
022d91ba DG |
1081 | struct agent_app *app; |
1082 | struct agent_event *event; | |
f20baf8e DG |
1083 | struct lttng_ht_iter iter; |
1084 | ||
022d91ba | 1085 | assert(agt); |
f20baf8e DG |
1086 | assert(sock >= 0); |
1087 | ||
022d91ba | 1088 | DBG("Agent updating app socket %d", sock); |
f20baf8e DG |
1089 | |
1090 | rcu_read_lock(); | |
022d91ba | 1091 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e DG |
1092 | /* Skip event if disabled. */ |
1093 | if (!event->enabled) { | |
1094 | continue; | |
1095 | } | |
1096 | ||
022d91ba | 1097 | app = agent_find_app_by_sock(sock); |
f20baf8e DG |
1098 | /* |
1099 | * We are in the registration path thus if the application is gone, | |
1100 | * there is a serious code flow error. | |
1101 | */ | |
1102 | assert(app); | |
1103 | ||
1104 | ret = enable_event(app, event); | |
1105 | if (ret != LTTNG_OK) { | |
022d91ba | 1106 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
1107 | event->name, app->pid, app->sock->fd); |
1108 | /* Let's try the others here and don't assume the app is dead. */ | |
1109 | continue; | |
1110 | } | |
1111 | } | |
1112 | rcu_read_unlock(); | |
0475c50c | 1113 | } |