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