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 | 126 | |
4715a5ff | 127 | agent_destroy_event(event); |
0475c50c DG |
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); | |
a58f824d MD |
395 | memset(&msg, 0, sizeof(msg)); |
396 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { | |
397 | ret = LTTNG_ERR_INVALID; | |
398 | goto error; | |
399 | } | |
f20baf8e | 400 | |
022d91ba | 401 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
f20baf8e DG |
402 | if (ret < 0) { |
403 | goto error_io; | |
404 | } | |
405 | ||
f20baf8e DG |
406 | ret = send_payload(app->sock, &msg, sizeof(msg)); |
407 | if (ret < 0) { | |
408 | goto error_io; | |
409 | } | |
410 | ||
411 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
412 | if (ret < 0) { | |
413 | goto error_io; | |
414 | } | |
415 | ||
416 | switch (be32toh(reply.ret_code)) { | |
022d91ba DG |
417 | case AGENT_RET_CODE_SUCCESS: |
418 | break; | |
419 | case AGENT_RET_CODE_UNKNOWN_NAME: | |
420 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
421 | goto error; | |
422 | default: | |
423 | ERR("Agent returned an unknown code: %" PRIu32, | |
424 | be32toh(reply.ret_code)); | |
425 | ret = LTTNG_ERR_FATAL; | |
426 | goto error; | |
f20baf8e DG |
427 | } |
428 | ||
429 | return LTTNG_OK; | |
430 | ||
431 | error_io: | |
432 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
433 | error: | |
434 | return ret; | |
435 | } | |
436 | ||
1b500e7a | 437 | /* |
022d91ba | 438 | * Send back the registration DONE command to a given agent application. |
1b500e7a DG |
439 | * |
440 | * Return 0 on success or else a negative value. | |
441 | */ | |
022d91ba | 442 | int agent_send_registration_done(struct agent_app *app) |
1b500e7a DG |
443 | { |
444 | assert(app); | |
445 | assert(app->sock); | |
446 | ||
022d91ba | 447 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
1b500e7a | 448 | |
df09ff2e | 449 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 1); |
1b500e7a DG |
450 | } |
451 | ||
f20baf8e | 452 | /* |
022d91ba | 453 | * Enable agent event on every agent applications registered with the session |
f20baf8e DG |
454 | * daemon. |
455 | * | |
456 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
457 | */ | |
fefd409b DG |
458 | int agent_enable_event(struct agent_event *event, |
459 | enum lttng_domain_type domain) | |
f20baf8e DG |
460 | { |
461 | int ret; | |
022d91ba | 462 | struct agent_app *app; |
f20baf8e DG |
463 | struct lttng_ht_iter iter; |
464 | ||
465 | assert(event); | |
466 | ||
467 | rcu_read_lock(); | |
468 | ||
022d91ba | 469 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 470 | node.node) { |
fefd409b DG |
471 | if (app->domain != domain) { |
472 | continue; | |
473 | } | |
474 | ||
022d91ba | 475 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
476 | ret = enable_event(app, event); |
477 | if (ret != LTTNG_OK) { | |
478 | goto error; | |
479 | } | |
f20baf8e DG |
480 | } |
481 | ||
3c6a091f | 482 | event->enabled = 1; |
f20baf8e DG |
483 | ret = LTTNG_OK; |
484 | ||
485 | error: | |
486 | rcu_read_unlock(); | |
487 | return ret; | |
488 | } | |
489 | ||
490 | /* | |
022d91ba | 491 | * Disable agent event on every agent applications registered with the session |
f20baf8e DG |
492 | * daemon. |
493 | * | |
494 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
495 | */ | |
fefd409b DG |
496 | int agent_disable_event(struct agent_event *event, |
497 | enum lttng_domain_type domain) | |
f20baf8e | 498 | { |
df09ff2e | 499 | int ret = LTTNG_OK; |
022d91ba | 500 | struct agent_app *app; |
f20baf8e DG |
501 | struct lttng_ht_iter iter; |
502 | ||
503 | assert(event); | |
df09ff2e JG |
504 | if (!event->enabled) { |
505 | goto end; | |
506 | } | |
f20baf8e DG |
507 | |
508 | rcu_read_lock(); | |
509 | ||
022d91ba | 510 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 511 | node.node) { |
fefd409b DG |
512 | if (app->domain != domain) { |
513 | continue; | |
514 | } | |
515 | ||
022d91ba | 516 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
517 | ret = disable_event(app, event); |
518 | if (ret != LTTNG_OK) { | |
519 | goto error; | |
520 | } | |
f20baf8e DG |
521 | } |
522 | ||
3c6a091f | 523 | event->enabled = 0; |
f20baf8e DG |
524 | |
525 | error: | |
526 | rcu_read_unlock(); | |
df09ff2e | 527 | end: |
f20baf8e DG |
528 | return ret; |
529 | } | |
530 | ||
531 | /* | |
022d91ba DG |
532 | * Ask every agent for the list of possible event. Events is allocated with the |
533 | * events of every agent application. | |
f20baf8e DG |
534 | * |
535 | * Return the number of events or else a negative value. | |
536 | */ | |
f60140a1 DG |
537 | int agent_list_events(struct lttng_event **events, |
538 | enum lttng_domain_type domain) | |
f20baf8e DG |
539 | { |
540 | int ret; | |
541 | size_t nbmem, count = 0; | |
022d91ba | 542 | struct agent_app *app; |
aae6255e | 543 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
544 | struct lttng_ht_iter iter; |
545 | ||
546 | assert(events); | |
547 | ||
548 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
549 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
550 | if (!tmp_events) { | |
022d91ba | 551 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
552 | ret = -ENOMEM; |
553 | goto error; | |
554 | } | |
555 | ||
556 | rcu_read_lock(); | |
022d91ba | 557 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
558 | node.node) { |
559 | ssize_t nb_ev; | |
022d91ba | 560 | struct lttng_event *agent_events; |
f20baf8e | 561 | |
f60140a1 DG |
562 | /* Skip domain not asked by the list. */ |
563 | if (app->domain != domain) { | |
564 | continue; | |
565 | } | |
566 | ||
022d91ba | 567 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
568 | if (nb_ev < 0) { |
569 | ret = nb_ev; | |
428de77a | 570 | goto error_unlock; |
f20baf8e DG |
571 | } |
572 | ||
53efb85a | 573 | if (count + nb_ev > nbmem) { |
f20baf8e | 574 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
575 | struct lttng_event *new_tmp_events; |
576 | size_t new_nbmem; | |
577 | ||
578 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 579 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
580 | nbmem, new_nbmem); |
581 | new_tmp_events = realloc(tmp_events, | |
582 | new_nbmem * sizeof(*new_tmp_events)); | |
583 | if (!new_tmp_events) { | |
022d91ba | 584 | PERROR("realloc agent events"); |
f20baf8e | 585 | ret = -ENOMEM; |
022d91ba | 586 | free(agent_events); |
428de77a | 587 | goto error_unlock; |
f20baf8e | 588 | } |
53efb85a MD |
589 | /* Zero the new memory */ |
590 | memset(new_tmp_events + nbmem, 0, | |
591 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
592 | nbmem = new_nbmem; | |
593 | tmp_events = new_tmp_events; | |
f20baf8e | 594 | } |
022d91ba | 595 | memcpy(tmp_events + count, agent_events, |
53efb85a | 596 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 597 | free(agent_events); |
f20baf8e DG |
598 | count += nb_ev; |
599 | } | |
600 | rcu_read_unlock(); | |
601 | ||
602 | ret = count; | |
603 | *events = tmp_events; | |
aae6255e | 604 | return ret; |
f20baf8e | 605 | |
428de77a MD |
606 | error_unlock: |
607 | rcu_read_unlock(); | |
f20baf8e | 608 | error: |
aae6255e | 609 | free(tmp_events); |
f20baf8e DG |
610 | return ret; |
611 | } | |
612 | ||
613 | /* | |
022d91ba | 614 | * Create a agent app object using the given PID. |
f20baf8e DG |
615 | * |
616 | * Return newly allocated object or else NULL on error. | |
617 | */ | |
fefd409b DG |
618 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
619 | struct lttcomm_sock *sock) | |
f20baf8e | 620 | { |
022d91ba | 621 | struct agent_app *app; |
f20baf8e DG |
622 | |
623 | assert(sock); | |
624 | ||
625 | app = zmalloc(sizeof(*app)); | |
626 | if (!app) { | |
022d91ba | 627 | PERROR("zmalloc agent create"); |
f20baf8e DG |
628 | goto error; |
629 | } | |
630 | ||
631 | app->pid = pid; | |
fefd409b | 632 | app->domain = domain; |
f20baf8e | 633 | app->sock = sock; |
f20baf8e DG |
634 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
635 | ||
636 | error: | |
637 | return app; | |
638 | } | |
639 | ||
640 | /* | |
022d91ba | 641 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
642 | * |
643 | * RCU read side lock MUST be acquired. | |
644 | * | |
645 | * Return object if found else NULL. | |
646 | */ | |
022d91ba | 647 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
648 | { |
649 | struct lttng_ht_node_ulong *node; | |
650 | struct lttng_ht_iter iter; | |
022d91ba | 651 | struct agent_app *app; |
f20baf8e DG |
652 | |
653 | assert(sock >= 0); | |
654 | ||
022d91ba | 655 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
f20baf8e DG |
656 | node = lttng_ht_iter_get_node_ulong(&iter); |
657 | if (node == NULL) { | |
658 | goto error; | |
659 | } | |
022d91ba | 660 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 661 | |
022d91ba | 662 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
663 | return app; |
664 | ||
665 | error: | |
022d91ba | 666 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
667 | return NULL; |
668 | } | |
669 | ||
670 | /* | |
022d91ba | 671 | * Add agent application object to the global hash table. |
f20baf8e | 672 | */ |
022d91ba | 673 | void agent_add_app(struct agent_app *app) |
f20baf8e DG |
674 | { |
675 | assert(app); | |
676 | ||
022d91ba | 677 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
f20baf8e DG |
678 | |
679 | rcu_read_lock(); | |
022d91ba | 680 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
681 | rcu_read_unlock(); |
682 | } | |
683 | ||
f20baf8e | 684 | /* |
022d91ba | 685 | * Delete agent application from the global hash table. |
022541e7 JG |
686 | * |
687 | * rcu_read_lock() must be held by the caller. | |
f20baf8e | 688 | */ |
022d91ba | 689 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
690 | { |
691 | int ret; | |
692 | struct lttng_ht_iter iter; | |
693 | ||
694 | assert(app); | |
695 | ||
022d91ba | 696 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
697 | |
698 | iter.iter.node = &app->node.node; | |
022d91ba | 699 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
f20baf8e DG |
700 | assert(!ret); |
701 | } | |
702 | ||
703 | /* | |
022d91ba DG |
704 | * Destroy a agent application object by detaching it from its corresponding |
705 | * UST app if one is connected by closing the socket. Finally, perform a | |
428de77a | 706 | * delayed memory reclaim. |
f20baf8e | 707 | */ |
022d91ba | 708 | void agent_destroy_app(struct agent_app *app) |
f20baf8e DG |
709 | { |
710 | assert(app); | |
711 | ||
712 | if (app->sock) { | |
713 | app->sock->ops->close(app->sock); | |
714 | lttcomm_destroy_sock(app->sock); | |
715 | } | |
716 | ||
022d91ba | 717 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
718 | } |
719 | ||
0475c50c | 720 | /* |
022d91ba | 721 | * Initialize an already allocated agent object. |
0475c50c DG |
722 | * |
723 | * Return 0 on success or else a negative errno value. | |
724 | */ | |
022d91ba | 725 | int agent_init(struct agent *agt) |
0475c50c DG |
726 | { |
727 | int ret; | |
728 | ||
022d91ba | 729 | assert(agt); |
0475c50c | 730 | |
022d91ba DG |
731 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
732 | if (!agt->events) { | |
0475c50c DG |
733 | ret = -ENOMEM; |
734 | goto error; | |
735 | } | |
fefd409b | 736 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
0475c50c DG |
737 | |
738 | return 0; | |
739 | ||
740 | error: | |
741 | return ret; | |
742 | } | |
743 | ||
fefd409b DG |
744 | /* |
745 | * Add agent object to the given hash table. | |
746 | */ | |
747 | void agent_add(struct agent *agt, struct lttng_ht *ht) | |
748 | { | |
749 | assert(agt); | |
750 | assert(ht); | |
751 | ||
752 | DBG3("Agent adding from domain %d", agt->domain); | |
753 | ||
754 | rcu_read_lock(); | |
755 | lttng_ht_add_unique_u64(ht, &agt->node); | |
756 | rcu_read_unlock(); | |
757 | } | |
758 | ||
759 | /* | |
760 | * Create an agent object for the given domain. | |
761 | * | |
762 | * Return the allocated agent or NULL on error. | |
763 | */ | |
764 | struct agent *agent_create(enum lttng_domain_type domain) | |
765 | { | |
766 | int ret; | |
767 | struct agent *agt; | |
768 | ||
769 | agt = zmalloc(sizeof(*agt)); | |
770 | if (!agt) { | |
771 | goto error; | |
772 | } | |
773 | agt->domain = domain; | |
774 | ||
775 | ret = agent_init(agt); | |
776 | if (ret < 0) { | |
777 | free(agt); | |
988ae332 | 778 | agt = NULL; |
fefd409b DG |
779 | goto error; |
780 | } | |
781 | ||
782 | error: | |
783 | return agt; | |
784 | } | |
785 | ||
0475c50c | 786 | /* |
022d91ba | 787 | * Create a newly allocated agent event data structure. If name is valid, it's |
0475c50c DG |
788 | * copied into the created event. |
789 | * | |
790 | * Return a new object else NULL on error. | |
791 | */ | |
022d91ba | 792 | struct agent_event *agent_create_event(const char *name, |
be6a6276 | 793 | struct lttng_filter_bytecode *filter) |
0475c50c | 794 | { |
022d91ba | 795 | struct agent_event *event; |
0475c50c | 796 | |
022d91ba | 797 | DBG3("Agent create new event with name %s", name); |
0475c50c DG |
798 | |
799 | event = zmalloc(sizeof(*event)); | |
800 | if (!event) { | |
801 | goto error; | |
802 | } | |
803 | ||
804 | if (name) { | |
805 | strncpy(event->name, name, sizeof(event->name)); | |
806 | event->name[sizeof(event->name) - 1] = '\0'; | |
f20baf8e | 807 | lttng_ht_node_init_str(&event->node, event->name); |
0475c50c DG |
808 | } |
809 | ||
be6a6276 DG |
810 | if (filter) { |
811 | event->filter = filter; | |
812 | } | |
813 | ||
0475c50c DG |
814 | error: |
815 | return event; | |
816 | } | |
817 | ||
818 | /* | |
022d91ba | 819 | * Unique add of a agent event to an agent object. |
0475c50c | 820 | */ |
022d91ba | 821 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c DG |
822 | { |
823 | assert(event); | |
022d91ba DG |
824 | assert(agt); |
825 | assert(agt->events); | |
0475c50c | 826 | |
022d91ba | 827 | DBG3("Agent adding event %s", event->name); |
0475c50c | 828 | |
f20baf8e | 829 | rcu_read_lock(); |
022d91ba | 830 | add_unique_agent_event(agt->events, event); |
f20baf8e | 831 | rcu_read_unlock(); |
022d91ba | 832 | agt->being_used = 1; |
0475c50c DG |
833 | } |
834 | ||
835 | /* | |
022d91ba | 836 | * Find a agent event in the given agent using name. |
4a4ab2c3 DG |
837 | * |
838 | * RCU read side lock MUST be acquired. | |
839 | * | |
840 | * Return object if found else NULL. | |
841 | */ | |
022d91ba DG |
842 | struct agent_event *agent_find_event_by_name(const char *name, |
843 | struct agent *agt) | |
4a4ab2c3 DG |
844 | { |
845 | struct lttng_ht_node_str *node; | |
846 | struct lttng_ht_iter iter; | |
847 | struct lttng_ht *ht; | |
022d91ba | 848 | struct agent_ht_key key; |
4a4ab2c3 DG |
849 | |
850 | assert(name); | |
022d91ba DG |
851 | assert(agt); |
852 | assert(agt->events); | |
4a4ab2c3 | 853 | |
022d91ba | 854 | ht = agt->events; |
4a4ab2c3 DG |
855 | key.name = name; |
856 | ||
857 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
858 | ht_match_event_by_name, &key, &iter.iter); | |
859 | node = lttng_ht_iter_get_node_str(&iter); | |
860 | if (node == NULL) { | |
861 | goto error; | |
862 | } | |
863 | ||
022d91ba DG |
864 | DBG3("Agent event found %s by name.", name); |
865 | return caa_container_of(node, struct agent_event, node); | |
4a4ab2c3 DG |
866 | |
867 | error: | |
022d91ba | 868 | DBG3("Agent NOT found by name %s.", name); |
4a4ab2c3 DG |
869 | return NULL; |
870 | } | |
871 | ||
872 | /* | |
022d91ba | 873 | * Find a agent event in the given agent using name and loglevel. |
0475c50c DG |
874 | * |
875 | * RCU read side lock MUST be acquired. | |
876 | * | |
877 | * Return object if found else NULL. | |
878 | */ | |
022d91ba DG |
879 | struct agent_event *agent_find_event(const char *name, int loglevel, |
880 | struct agent *agt) | |
0475c50c DG |
881 | { |
882 | struct lttng_ht_node_str *node; | |
883 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 884 | struct lttng_ht *ht; |
022d91ba | 885 | struct agent_ht_key key; |
0475c50c DG |
886 | |
887 | assert(name); | |
022d91ba DG |
888 | assert(agt); |
889 | assert(agt->events); | |
0475c50c | 890 | |
022d91ba | 891 | ht = agt->events; |
4a4ab2c3 DG |
892 | key.name = name; |
893 | key.loglevel = loglevel; | |
894 | ||
895 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
896 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
897 | node = lttng_ht_iter_get_node_str(&iter); |
898 | if (node == NULL) { | |
899 | goto error; | |
900 | } | |
901 | ||
022d91ba DG |
902 | DBG3("Agent event found %s.", name); |
903 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
904 | |
905 | error: | |
e03385f8 | 906 | DBG3("Agent event NOT found %s.", name); |
0475c50c DG |
907 | return NULL; |
908 | } | |
909 | ||
0475c50c | 910 | /* |
022d91ba DG |
911 | * Free given agent event. This event must not be globally visible at this |
912 | * point (only expected to be used on failure just after event creation). After | |
913 | * this call, the pointer is not usable anymore. | |
0475c50c | 914 | */ |
022d91ba | 915 | void agent_destroy_event(struct agent_event *event) |
0475c50c DG |
916 | { |
917 | assert(event); | |
918 | ||
0f9981d0 | 919 | free(event->filter); |
8a1032bc | 920 | free(event->filter_expression); |
0475c50c DG |
921 | free(event); |
922 | } | |
923 | ||
924 | /* | |
b7d46972 | 925 | * Destroy an agent completely. |
0475c50c | 926 | */ |
022d91ba | 927 | void agent_destroy(struct agent *agt) |
0475c50c DG |
928 | { |
929 | struct lttng_ht_node_str *node; | |
930 | struct lttng_ht_iter iter; | |
931 | ||
022d91ba | 932 | assert(agt); |
0475c50c | 933 | |
022d91ba | 934 | DBG3("Agent destroy"); |
0475c50c DG |
935 | |
936 | /* | |
937 | * Just ignore if no events hash table exists. This is possible if for | |
022d91ba | 938 | * instance an agent object was allocated but not initialized. |
0475c50c | 939 | */ |
022d91ba | 940 | if (!agt->events) { |
0475c50c DG |
941 | return; |
942 | } | |
943 | ||
944 | rcu_read_lock(); | |
022d91ba | 945 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 946 | int ret; |
022d91ba | 947 | struct agent_event *event; |
29c0fd4d DG |
948 | |
949 | /* | |
950 | * When destroying an event, we have to try to disable it on the agent | |
951 | * side so the event stops generating data. The return value is not | |
952 | * important since we have to continue anyway destroying the object. | |
953 | */ | |
022d91ba DG |
954 | event = caa_container_of(node, struct agent_event, node); |
955 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 956 | |
022d91ba | 957 | ret = lttng_ht_del(agt->events, &iter); |
0475c50c | 958 | assert(!ret); |
022d91ba | 959 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c DG |
960 | } |
961 | rcu_read_unlock(); | |
962 | ||
6fe6fff5 | 963 | ht_cleanup_push(agt->events); |
b7d46972 | 964 | free(agt); |
f20baf8e DG |
965 | } |
966 | ||
967 | /* | |
db17cf0e | 968 | * Allocate agent_apps_ht_by_sock. |
f20baf8e | 969 | */ |
db17cf0e | 970 | int agent_app_ht_alloc(void) |
f20baf8e | 971 | { |
db17cf0e JG |
972 | int ret = 0; |
973 | ||
022d91ba DG |
974 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
975 | if (!agent_apps_ht_by_sock) { | |
db17cf0e | 976 | ret = -1; |
f20baf8e DG |
977 | } |
978 | ||
db17cf0e JG |
979 | return ret; |
980 | } | |
981 | ||
982 | /* | |
983 | * Destroy a agent application by socket. | |
984 | */ | |
985 | void agent_destroy_app_by_sock(int sock) | |
986 | { | |
987 | struct agent_app *app; | |
988 | ||
989 | assert(sock >= 0); | |
990 | ||
991 | /* | |
992 | * Not finding an application is a very important error that should NEVER | |
993 | * happen. The hash table deletion is ONLY done through this call when the | |
994 | * main sessiond thread is torn down. | |
995 | */ | |
996 | rcu_read_lock(); | |
997 | app = agent_find_app_by_sock(sock); | |
998 | assert(app); | |
999 | ||
1000 | /* RCU read side lock is assumed to be held by this function. */ | |
1001 | agent_delete_app(app); | |
1002 | ||
1003 | /* The application is freed in a RCU call but the socket is closed here. */ | |
1004 | agent_destroy_app(app); | |
1005 | rcu_read_unlock(); | |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * Clean-up the agent app hash table and destroy it. | |
1010 | */ | |
1011 | void agent_app_ht_clean(void) | |
1012 | { | |
1013 | struct lttng_ht_node_ulong *node; | |
1014 | struct lttng_ht_iter iter; | |
1015 | ||
14436168 JG |
1016 | if (!agent_apps_ht_by_sock) { |
1017 | return; | |
1018 | } | |
db17cf0e JG |
1019 | rcu_read_lock(); |
1020 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) { | |
1021 | struct agent_app *app; | |
1022 | ||
1023 | app = caa_container_of(node, struct agent_app, node); | |
1024 | agent_destroy_app_by_sock(app->sock->fd); | |
1025 | } | |
1026 | rcu_read_unlock(); | |
1027 | ||
1028 | lttng_ht_destroy(agent_apps_ht_by_sock); | |
f20baf8e DG |
1029 | } |
1030 | ||
1031 | /* | |
022d91ba | 1032 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
1033 | * |
1034 | * Note that this function is most likely to be used with a tracing session | |
1035 | * thus the caller should make sure to hold the appropriate lock(s). | |
1036 | */ | |
022d91ba | 1037 | void agent_update(struct agent *agt, int sock) |
f20baf8e DG |
1038 | { |
1039 | int ret; | |
022d91ba DG |
1040 | struct agent_app *app; |
1041 | struct agent_event *event; | |
f20baf8e DG |
1042 | struct lttng_ht_iter iter; |
1043 | ||
022d91ba | 1044 | assert(agt); |
f20baf8e DG |
1045 | assert(sock >= 0); |
1046 | ||
022d91ba | 1047 | DBG("Agent updating app socket %d", sock); |
f20baf8e DG |
1048 | |
1049 | rcu_read_lock(); | |
022d91ba | 1050 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e DG |
1051 | /* Skip event if disabled. */ |
1052 | if (!event->enabled) { | |
1053 | continue; | |
1054 | } | |
1055 | ||
022d91ba | 1056 | app = agent_find_app_by_sock(sock); |
f20baf8e DG |
1057 | /* |
1058 | * We are in the registration path thus if the application is gone, | |
1059 | * there is a serious code flow error. | |
1060 | */ | |
1061 | assert(app); | |
1062 | ||
1063 | ret = enable_event(app, event); | |
1064 | if (ret != LTTNG_OK) { | |
022d91ba | 1065 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
1066 | event->name, app->pid, app->sock->fd); |
1067 | /* Let's try the others here and don't assume the app is dead. */ | |
1068 | continue; | |
1069 | } | |
1070 | } | |
1071 | rcu_read_unlock(); | |
0475c50c | 1072 | } |