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 | */ | |
022d91ba | 455 | int agent_enable_event(struct agent_event *event) |
f20baf8e DG |
456 | { |
457 | int ret; | |
022d91ba | 458 | struct agent_app *app; |
f20baf8e DG |
459 | struct lttng_ht_iter iter; |
460 | ||
461 | assert(event); | |
462 | ||
463 | rcu_read_lock(); | |
464 | ||
022d91ba | 465 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 466 | node.node) { |
022d91ba | 467 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
468 | ret = enable_event(app, event); |
469 | if (ret != LTTNG_OK) { | |
470 | goto error; | |
471 | } | |
f20baf8e DG |
472 | } |
473 | ||
3c6a091f | 474 | event->enabled = 1; |
f20baf8e DG |
475 | ret = LTTNG_OK; |
476 | ||
477 | error: | |
478 | rcu_read_unlock(); | |
479 | return ret; | |
480 | } | |
481 | ||
482 | /* | |
022d91ba | 483 | * Disable agent event on every agent applications registered with the session |
f20baf8e DG |
484 | * daemon. |
485 | * | |
486 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
487 | */ | |
022d91ba | 488 | int agent_disable_event(struct agent_event *event) |
f20baf8e DG |
489 | { |
490 | int ret; | |
022d91ba | 491 | struct agent_app *app; |
f20baf8e DG |
492 | struct lttng_ht_iter iter; |
493 | ||
494 | assert(event); | |
495 | ||
496 | rcu_read_lock(); | |
497 | ||
022d91ba | 498 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 499 | node.node) { |
022d91ba | 500 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
501 | ret = disable_event(app, event); |
502 | if (ret != LTTNG_OK) { | |
503 | goto error; | |
504 | } | |
f20baf8e DG |
505 | } |
506 | ||
3c6a091f | 507 | event->enabled = 0; |
f20baf8e DG |
508 | ret = LTTNG_OK; |
509 | ||
510 | error: | |
511 | rcu_read_unlock(); | |
512 | return ret; | |
513 | } | |
514 | ||
515 | /* | |
022d91ba DG |
516 | * Ask every agent for the list of possible event. Events is allocated with the |
517 | * events of every agent application. | |
f20baf8e DG |
518 | * |
519 | * Return the number of events or else a negative value. | |
520 | */ | |
022d91ba | 521 | int agent_list_events(struct lttng_event **events) |
f20baf8e DG |
522 | { |
523 | int ret; | |
524 | size_t nbmem, count = 0; | |
022d91ba | 525 | struct agent_app *app; |
aae6255e | 526 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
527 | struct lttng_ht_iter iter; |
528 | ||
529 | assert(events); | |
530 | ||
531 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
532 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
533 | if (!tmp_events) { | |
022d91ba | 534 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
535 | ret = -ENOMEM; |
536 | goto error; | |
537 | } | |
538 | ||
539 | rcu_read_lock(); | |
022d91ba | 540 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
541 | node.node) { |
542 | ssize_t nb_ev; | |
022d91ba | 543 | struct lttng_event *agent_events; |
f20baf8e | 544 | |
022d91ba | 545 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
546 | if (nb_ev < 0) { |
547 | ret = nb_ev; | |
428de77a | 548 | goto error_unlock; |
f20baf8e DG |
549 | } |
550 | ||
53efb85a | 551 | if (count + nb_ev > nbmem) { |
f20baf8e | 552 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
553 | struct lttng_event *new_tmp_events; |
554 | size_t new_nbmem; | |
555 | ||
556 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 557 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
558 | nbmem, new_nbmem); |
559 | new_tmp_events = realloc(tmp_events, | |
560 | new_nbmem * sizeof(*new_tmp_events)); | |
561 | if (!new_tmp_events) { | |
022d91ba | 562 | PERROR("realloc agent events"); |
f20baf8e | 563 | ret = -ENOMEM; |
022d91ba | 564 | free(agent_events); |
428de77a | 565 | goto error_unlock; |
f20baf8e | 566 | } |
53efb85a MD |
567 | /* Zero the new memory */ |
568 | memset(new_tmp_events + nbmem, 0, | |
569 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
570 | nbmem = new_nbmem; | |
571 | tmp_events = new_tmp_events; | |
f20baf8e | 572 | } |
022d91ba | 573 | memcpy(tmp_events + count, agent_events, |
53efb85a | 574 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 575 | free(agent_events); |
f20baf8e DG |
576 | count += nb_ev; |
577 | } | |
578 | rcu_read_unlock(); | |
579 | ||
580 | ret = count; | |
581 | *events = tmp_events; | |
aae6255e | 582 | return ret; |
f20baf8e | 583 | |
428de77a MD |
584 | error_unlock: |
585 | rcu_read_unlock(); | |
f20baf8e | 586 | error: |
aae6255e | 587 | free(tmp_events); |
f20baf8e DG |
588 | return ret; |
589 | } | |
590 | ||
591 | /* | |
022d91ba | 592 | * Create a agent app object using the given PID. |
f20baf8e DG |
593 | * |
594 | * Return newly allocated object or else NULL on error. | |
595 | */ | |
022d91ba | 596 | struct agent_app *agent_create_app(pid_t pid, struct lttcomm_sock *sock) |
f20baf8e | 597 | { |
022d91ba | 598 | struct agent_app *app; |
f20baf8e DG |
599 | |
600 | assert(sock); | |
601 | ||
602 | app = zmalloc(sizeof(*app)); | |
603 | if (!app) { | |
022d91ba | 604 | PERROR("zmalloc agent create"); |
f20baf8e DG |
605 | goto error; |
606 | } | |
607 | ||
608 | app->pid = pid; | |
609 | app->sock = sock; | |
f20baf8e DG |
610 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
611 | ||
612 | error: | |
613 | return app; | |
614 | } | |
615 | ||
616 | /* | |
022d91ba | 617 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
618 | * |
619 | * RCU read side lock MUST be acquired. | |
620 | * | |
621 | * Return object if found else NULL. | |
622 | */ | |
022d91ba | 623 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
624 | { |
625 | struct lttng_ht_node_ulong *node; | |
626 | struct lttng_ht_iter iter; | |
022d91ba | 627 | struct agent_app *app; |
f20baf8e DG |
628 | |
629 | assert(sock >= 0); | |
630 | ||
022d91ba | 631 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
f20baf8e DG |
632 | node = lttng_ht_iter_get_node_ulong(&iter); |
633 | if (node == NULL) { | |
634 | goto error; | |
635 | } | |
022d91ba | 636 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 637 | |
022d91ba | 638 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
639 | return app; |
640 | ||
641 | error: | |
022d91ba | 642 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
643 | return NULL; |
644 | } | |
645 | ||
646 | /* | |
022d91ba | 647 | * Add agent application object to the global hash table. |
f20baf8e | 648 | */ |
022d91ba | 649 | void agent_add_app(struct agent_app *app) |
f20baf8e DG |
650 | { |
651 | assert(app); | |
652 | ||
022d91ba | 653 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
f20baf8e DG |
654 | |
655 | rcu_read_lock(); | |
022d91ba | 656 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
657 | rcu_read_unlock(); |
658 | } | |
659 | ||
f20baf8e | 660 | /* |
022d91ba | 661 | * Delete agent application from the global hash table. |
f20baf8e | 662 | */ |
022d91ba | 663 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
664 | { |
665 | int ret; | |
666 | struct lttng_ht_iter iter; | |
667 | ||
668 | assert(app); | |
669 | ||
022d91ba | 670 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
671 | |
672 | iter.iter.node = &app->node.node; | |
673 | rcu_read_lock(); | |
022d91ba | 674 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
f20baf8e DG |
675 | rcu_read_unlock(); |
676 | assert(!ret); | |
677 | } | |
678 | ||
679 | /* | |
022d91ba DG |
680 | * Destroy a agent application object by detaching it from its corresponding |
681 | * UST app if one is connected by closing the socket. Finally, perform a | |
428de77a | 682 | * delayed memory reclaim. |
f20baf8e | 683 | */ |
022d91ba | 684 | void agent_destroy_app(struct agent_app *app) |
f20baf8e DG |
685 | { |
686 | assert(app); | |
687 | ||
688 | if (app->sock) { | |
689 | app->sock->ops->close(app->sock); | |
690 | lttcomm_destroy_sock(app->sock); | |
691 | } | |
692 | ||
022d91ba | 693 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
694 | } |
695 | ||
0475c50c | 696 | /* |
022d91ba | 697 | * Initialize an already allocated agent object. |
0475c50c DG |
698 | * |
699 | * Return 0 on success or else a negative errno value. | |
700 | */ | |
022d91ba | 701 | int agent_init(struct agent *agt) |
0475c50c DG |
702 | { |
703 | int ret; | |
704 | ||
022d91ba | 705 | assert(agt); |
0475c50c | 706 | |
022d91ba DG |
707 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
708 | if (!agt->events) { | |
0475c50c DG |
709 | ret = -ENOMEM; |
710 | goto error; | |
711 | } | |
712 | ||
713 | return 0; | |
714 | ||
715 | error: | |
716 | return ret; | |
717 | } | |
718 | ||
719 | /* | |
022d91ba | 720 | * Create a newly allocated agent event data structure. If name is valid, it's |
0475c50c DG |
721 | * copied into the created event. |
722 | * | |
723 | * Return a new object else NULL on error. | |
724 | */ | |
022d91ba | 725 | struct agent_event *agent_create_event(const char *name, |
be6a6276 | 726 | struct lttng_filter_bytecode *filter) |
0475c50c | 727 | { |
022d91ba | 728 | struct agent_event *event; |
0475c50c | 729 | |
022d91ba | 730 | DBG3("Agent create new event with name %s", name); |
0475c50c DG |
731 | |
732 | event = zmalloc(sizeof(*event)); | |
733 | if (!event) { | |
734 | goto error; | |
735 | } | |
736 | ||
737 | if (name) { | |
738 | strncpy(event->name, name, sizeof(event->name)); | |
739 | event->name[sizeof(event->name) - 1] = '\0'; | |
f20baf8e | 740 | lttng_ht_node_init_str(&event->node, event->name); |
0475c50c DG |
741 | } |
742 | ||
be6a6276 DG |
743 | if (filter) { |
744 | event->filter = filter; | |
745 | } | |
746 | ||
0475c50c DG |
747 | error: |
748 | return event; | |
749 | } | |
750 | ||
751 | /* | |
022d91ba | 752 | * Unique add of a agent event to an agent object. |
0475c50c | 753 | */ |
022d91ba | 754 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c DG |
755 | { |
756 | assert(event); | |
022d91ba DG |
757 | assert(agt); |
758 | assert(agt->events); | |
0475c50c | 759 | |
022d91ba | 760 | DBG3("Agent adding event %s", event->name); |
0475c50c | 761 | |
f20baf8e | 762 | rcu_read_lock(); |
022d91ba | 763 | add_unique_agent_event(agt->events, event); |
f20baf8e | 764 | rcu_read_unlock(); |
022d91ba | 765 | agt->being_used = 1; |
0475c50c DG |
766 | } |
767 | ||
768 | /* | |
022d91ba | 769 | * Find a agent event in the given agent using name. |
4a4ab2c3 DG |
770 | * |
771 | * RCU read side lock MUST be acquired. | |
772 | * | |
773 | * Return object if found else NULL. | |
774 | */ | |
022d91ba DG |
775 | struct agent_event *agent_find_event_by_name(const char *name, |
776 | struct agent *agt) | |
4a4ab2c3 DG |
777 | { |
778 | struct lttng_ht_node_str *node; | |
779 | struct lttng_ht_iter iter; | |
780 | struct lttng_ht *ht; | |
022d91ba | 781 | struct agent_ht_key key; |
4a4ab2c3 DG |
782 | |
783 | assert(name); | |
022d91ba DG |
784 | assert(agt); |
785 | assert(agt->events); | |
4a4ab2c3 | 786 | |
022d91ba | 787 | ht = agt->events; |
4a4ab2c3 DG |
788 | key.name = name; |
789 | ||
790 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
791 | ht_match_event_by_name, &key, &iter.iter); | |
792 | node = lttng_ht_iter_get_node_str(&iter); | |
793 | if (node == NULL) { | |
794 | goto error; | |
795 | } | |
796 | ||
022d91ba DG |
797 | DBG3("Agent event found %s by name.", name); |
798 | return caa_container_of(node, struct agent_event, node); | |
4a4ab2c3 DG |
799 | |
800 | error: | |
022d91ba | 801 | DBG3("Agent NOT found by name %s.", name); |
4a4ab2c3 DG |
802 | return NULL; |
803 | } | |
804 | ||
805 | /* | |
022d91ba | 806 | * Find a agent event in the given agent using name and loglevel. |
0475c50c DG |
807 | * |
808 | * RCU read side lock MUST be acquired. | |
809 | * | |
810 | * Return object if found else NULL. | |
811 | */ | |
022d91ba DG |
812 | struct agent_event *agent_find_event(const char *name, int loglevel, |
813 | struct agent *agt) | |
0475c50c DG |
814 | { |
815 | struct lttng_ht_node_str *node; | |
816 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 817 | struct lttng_ht *ht; |
022d91ba | 818 | struct agent_ht_key key; |
0475c50c DG |
819 | |
820 | assert(name); | |
022d91ba DG |
821 | assert(agt); |
822 | assert(agt->events); | |
0475c50c | 823 | |
022d91ba | 824 | ht = agt->events; |
4a4ab2c3 DG |
825 | key.name = name; |
826 | key.loglevel = loglevel; | |
827 | ||
828 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
829 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
830 | node = lttng_ht_iter_get_node_str(&iter); |
831 | if (node == NULL) { | |
832 | goto error; | |
833 | } | |
834 | ||
022d91ba DG |
835 | DBG3("Agent event found %s.", name); |
836 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
837 | |
838 | error: | |
022d91ba | 839 | DBG3("Agent NOT found %s.", name); |
0475c50c DG |
840 | return NULL; |
841 | } | |
842 | ||
0475c50c | 843 | /* |
022d91ba DG |
844 | * Free given agent event. This event must not be globally visible at this |
845 | * point (only expected to be used on failure just after event creation). After | |
846 | * this call, the pointer is not usable anymore. | |
0475c50c | 847 | */ |
022d91ba | 848 | void agent_destroy_event(struct agent_event *event) |
0475c50c DG |
849 | { |
850 | assert(event); | |
851 | ||
852 | free(event); | |
853 | } | |
854 | ||
855 | /* | |
022d91ba | 856 | * Destroy an agent completely. Note that the given pointer is NOT freed |
428de77a | 857 | * thus a reference to static or stack data can be passed to this function. |
0475c50c | 858 | */ |
022d91ba | 859 | void agent_destroy(struct agent *agt) |
0475c50c DG |
860 | { |
861 | struct lttng_ht_node_str *node; | |
862 | struct lttng_ht_iter iter; | |
863 | ||
022d91ba | 864 | assert(agt); |
0475c50c | 865 | |
022d91ba | 866 | DBG3("Agent destroy"); |
0475c50c DG |
867 | |
868 | /* | |
869 | * Just ignore if no events hash table exists. This is possible if for | |
022d91ba | 870 | * instance an agent object was allocated but not initialized. |
0475c50c | 871 | */ |
022d91ba | 872 | if (!agt->events) { |
0475c50c DG |
873 | return; |
874 | } | |
875 | ||
876 | rcu_read_lock(); | |
022d91ba | 877 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 878 | int ret; |
022d91ba | 879 | struct agent_event *event; |
29c0fd4d DG |
880 | |
881 | /* | |
882 | * When destroying an event, we have to try to disable it on the agent | |
883 | * side so the event stops generating data. The return value is not | |
884 | * important since we have to continue anyway destroying the object. | |
885 | */ | |
022d91ba DG |
886 | event = caa_container_of(node, struct agent_event, node); |
887 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 888 | |
022d91ba | 889 | ret = lttng_ht_del(agt->events, &iter); |
0475c50c | 890 | assert(!ret); |
022d91ba | 891 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c DG |
892 | } |
893 | rcu_read_unlock(); | |
894 | ||
022d91ba | 895 | lttng_ht_destroy(agt->events); |
f20baf8e DG |
896 | } |
897 | ||
898 | /* | |
022d91ba | 899 | * Initialize agent subsystem. |
f20baf8e | 900 | */ |
022d91ba | 901 | int agent_setup(void) |
f20baf8e | 902 | { |
022d91ba DG |
903 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
904 | if (!agent_apps_ht_by_sock) { | |
f20baf8e DG |
905 | return -1; |
906 | } | |
907 | ||
908 | return 0; | |
909 | } | |
910 | ||
911 | /* | |
022d91ba | 912 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
913 | * |
914 | * Note that this function is most likely to be used with a tracing session | |
915 | * thus the caller should make sure to hold the appropriate lock(s). | |
916 | */ | |
022d91ba | 917 | void agent_update(struct agent *agt, int sock) |
f20baf8e DG |
918 | { |
919 | int ret; | |
022d91ba DG |
920 | struct agent_app *app; |
921 | struct agent_event *event; | |
f20baf8e DG |
922 | struct lttng_ht_iter iter; |
923 | ||
022d91ba | 924 | assert(agt); |
f20baf8e DG |
925 | assert(sock >= 0); |
926 | ||
022d91ba | 927 | DBG("Agent updating app socket %d", sock); |
f20baf8e DG |
928 | |
929 | rcu_read_lock(); | |
022d91ba | 930 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e DG |
931 | /* Skip event if disabled. */ |
932 | if (!event->enabled) { | |
933 | continue; | |
934 | } | |
935 | ||
022d91ba | 936 | app = agent_find_app_by_sock(sock); |
f20baf8e DG |
937 | /* |
938 | * We are in the registration path thus if the application is gone, | |
939 | * there is a serious code flow error. | |
940 | */ | |
941 | assert(app); | |
942 | ||
943 | ret = enable_event(app, event); | |
944 | if (ret != LTTNG_OK) { | |
022d91ba | 945 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
946 | event->name, app->pid, app->sock->fd); |
947 | /* Let's try the others here and don't assume the app is dead. */ | |
948 | continue; | |
949 | } | |
950 | } | |
951 | rcu_read_unlock(); | |
0475c50c | 952 | } |