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