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; | |
560b5120 MD |
291 | if (lttng_strncpy(tmp_events[i].name, reply->payload + offset, |
292 | sizeof(tmp_events[i].name))) { | |
293 | ret = LTTNG_ERR_INVALID; | |
294 | goto error; | |
295 | } | |
3c6a091f DG |
296 | tmp_events[i].pid = app->pid; |
297 | tmp_events[i].enabled = -1; | |
298 | len = strlen(reply->payload + offset) + 1; | |
299 | } | |
300 | ||
301 | *events = tmp_events; | |
302 | ||
303 | free(reply); | |
304 | return nb_event; | |
305 | ||
306 | error_io: | |
307 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
308 | error: | |
309 | free(reply); | |
310 | free(tmp_events); | |
311 | return -ret; | |
312 | ||
313 | } | |
314 | ||
f20baf8e | 315 | /* |
022d91ba DG |
316 | * Internal enable agent event on a agent application. This function |
317 | * communicates with the agent to enable a given event. | |
f20baf8e DG |
318 | * |
319 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
320 | */ | |
022d91ba | 321 | static int enable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
322 | { |
323 | int ret; | |
324 | uint64_t data_size; | |
022d91ba DG |
325 | struct lttcomm_agent_enable msg; |
326 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
327 | |
328 | assert(app); | |
329 | assert(app->sock); | |
330 | assert(event); | |
331 | ||
022d91ba | 332 | DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
333 | app->pid, app->sock->fd); |
334 | ||
335 | data_size = sizeof(msg); | |
336 | ||
022d91ba | 337 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
f20baf8e DG |
338 | if (ret < 0) { |
339 | goto error_io; | |
340 | } | |
341 | ||
53efb85a | 342 | memset(&msg, 0, sizeof(msg)); |
b2064f54 DG |
343 | msg.loglevel = event->loglevel; |
344 | msg.loglevel_type = event->loglevel_type; | |
f20baf8e DG |
345 | strncpy(msg.name, event->name, sizeof(msg.name)); |
346 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
347 | if (ret < 0) { | |
348 | goto error_io; | |
349 | } | |
350 | ||
351 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
352 | if (ret < 0) { | |
353 | goto error_io; | |
354 | } | |
355 | ||
356 | switch (be32toh(reply.ret_code)) { | |
022d91ba | 357 | case AGENT_RET_CODE_SUCCESS: |
f20baf8e | 358 | break; |
022d91ba | 359 | case AGENT_RET_CODE_UNKNOWN_NAME: |
f20baf8e DG |
360 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
361 | goto error; | |
362 | default: | |
022d91ba | 363 | ERR("Agent returned an unknown code: %" PRIu32, |
f20baf8e DG |
364 | be32toh(reply.ret_code)); |
365 | ret = LTTNG_ERR_FATAL; | |
366 | goto error; | |
367 | } | |
368 | ||
369 | return LTTNG_OK; | |
370 | ||
371 | error_io: | |
372 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
373 | error: | |
374 | return ret; | |
375 | } | |
376 | ||
377 | /* | |
022d91ba DG |
378 | * Internal disable agent event call on a agent application. This function |
379 | * communicates with the agent to disable a given event. | |
f20baf8e DG |
380 | * |
381 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
382 | */ | |
022d91ba | 383 | static int disable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
384 | { |
385 | int ret; | |
386 | uint64_t data_size; | |
022d91ba DG |
387 | struct lttcomm_agent_disable msg; |
388 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
389 | |
390 | assert(app); | |
391 | assert(app->sock); | |
392 | assert(event); | |
393 | ||
022d91ba | 394 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
395 | app->pid, app->sock->fd); |
396 | ||
397 | data_size = sizeof(msg); | |
a58f824d MD |
398 | memset(&msg, 0, sizeof(msg)); |
399 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { | |
400 | ret = LTTNG_ERR_INVALID; | |
401 | goto error; | |
402 | } | |
f20baf8e | 403 | |
022d91ba | 404 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
f20baf8e DG |
405 | if (ret < 0) { |
406 | goto error_io; | |
407 | } | |
408 | ||
f20baf8e DG |
409 | ret = send_payload(app->sock, &msg, sizeof(msg)); |
410 | if (ret < 0) { | |
411 | goto error_io; | |
412 | } | |
413 | ||
414 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
415 | if (ret < 0) { | |
416 | goto error_io; | |
417 | } | |
418 | ||
419 | switch (be32toh(reply.ret_code)) { | |
022d91ba DG |
420 | case AGENT_RET_CODE_SUCCESS: |
421 | break; | |
422 | case AGENT_RET_CODE_UNKNOWN_NAME: | |
423 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
424 | goto error; | |
425 | default: | |
426 | ERR("Agent returned an unknown code: %" PRIu32, | |
427 | be32toh(reply.ret_code)); | |
428 | ret = LTTNG_ERR_FATAL; | |
429 | goto error; | |
f20baf8e DG |
430 | } |
431 | ||
432 | return LTTNG_OK; | |
433 | ||
434 | error_io: | |
435 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
436 | error: | |
437 | return ret; | |
438 | } | |
439 | ||
1b500e7a | 440 | /* |
022d91ba | 441 | * Send back the registration DONE command to a given agent application. |
1b500e7a DG |
442 | * |
443 | * Return 0 on success or else a negative value. | |
444 | */ | |
022d91ba | 445 | int agent_send_registration_done(struct agent_app *app) |
1b500e7a DG |
446 | { |
447 | assert(app); | |
448 | assert(app->sock); | |
449 | ||
022d91ba | 450 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
1b500e7a | 451 | |
df09ff2e | 452 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 1); |
1b500e7a DG |
453 | } |
454 | ||
f20baf8e | 455 | /* |
022d91ba | 456 | * Enable agent event on every agent applications registered with the session |
f20baf8e DG |
457 | * daemon. |
458 | * | |
459 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
460 | */ | |
fefd409b DG |
461 | int agent_enable_event(struct agent_event *event, |
462 | enum lttng_domain_type domain) | |
f20baf8e DG |
463 | { |
464 | int ret; | |
022d91ba | 465 | struct agent_app *app; |
f20baf8e DG |
466 | struct lttng_ht_iter iter; |
467 | ||
468 | assert(event); | |
469 | ||
470 | rcu_read_lock(); | |
471 | ||
022d91ba | 472 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 473 | node.node) { |
fefd409b DG |
474 | if (app->domain != domain) { |
475 | continue; | |
476 | } | |
477 | ||
022d91ba | 478 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
479 | ret = enable_event(app, event); |
480 | if (ret != LTTNG_OK) { | |
481 | goto error; | |
482 | } | |
f20baf8e DG |
483 | } |
484 | ||
3c6a091f | 485 | event->enabled = 1; |
f20baf8e DG |
486 | ret = LTTNG_OK; |
487 | ||
488 | error: | |
489 | rcu_read_unlock(); | |
490 | return ret; | |
491 | } | |
492 | ||
493 | /* | |
022d91ba | 494 | * Disable agent event on every agent applications registered with the session |
f20baf8e DG |
495 | * daemon. |
496 | * | |
497 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
498 | */ | |
fefd409b DG |
499 | int agent_disable_event(struct agent_event *event, |
500 | enum lttng_domain_type domain) | |
f20baf8e | 501 | { |
df09ff2e | 502 | int ret = LTTNG_OK; |
022d91ba | 503 | struct agent_app *app; |
f20baf8e DG |
504 | struct lttng_ht_iter iter; |
505 | ||
506 | assert(event); | |
df09ff2e JG |
507 | if (!event->enabled) { |
508 | goto end; | |
509 | } | |
f20baf8e DG |
510 | |
511 | rcu_read_lock(); | |
512 | ||
022d91ba | 513 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 514 | node.node) { |
fefd409b DG |
515 | if (app->domain != domain) { |
516 | continue; | |
517 | } | |
518 | ||
022d91ba | 519 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
520 | ret = disable_event(app, event); |
521 | if (ret != LTTNG_OK) { | |
522 | goto error; | |
523 | } | |
f20baf8e DG |
524 | } |
525 | ||
3c6a091f | 526 | event->enabled = 0; |
f20baf8e DG |
527 | |
528 | error: | |
529 | rcu_read_unlock(); | |
df09ff2e | 530 | end: |
f20baf8e DG |
531 | return ret; |
532 | } | |
533 | ||
534 | /* | |
022d91ba DG |
535 | * Ask every agent for the list of possible event. Events is allocated with the |
536 | * events of every agent application. | |
f20baf8e DG |
537 | * |
538 | * Return the number of events or else a negative value. | |
539 | */ | |
f60140a1 DG |
540 | int agent_list_events(struct lttng_event **events, |
541 | enum lttng_domain_type domain) | |
f20baf8e DG |
542 | { |
543 | int ret; | |
544 | size_t nbmem, count = 0; | |
022d91ba | 545 | struct agent_app *app; |
aae6255e | 546 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
547 | struct lttng_ht_iter iter; |
548 | ||
549 | assert(events); | |
550 | ||
551 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
552 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
553 | if (!tmp_events) { | |
022d91ba | 554 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
555 | ret = -ENOMEM; |
556 | goto error; | |
557 | } | |
558 | ||
559 | rcu_read_lock(); | |
022d91ba | 560 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
561 | node.node) { |
562 | ssize_t nb_ev; | |
022d91ba | 563 | struct lttng_event *agent_events; |
f20baf8e | 564 | |
f60140a1 DG |
565 | /* Skip domain not asked by the list. */ |
566 | if (app->domain != domain) { | |
567 | continue; | |
568 | } | |
569 | ||
022d91ba | 570 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
571 | if (nb_ev < 0) { |
572 | ret = nb_ev; | |
428de77a | 573 | goto error_unlock; |
f20baf8e DG |
574 | } |
575 | ||
53efb85a | 576 | if (count + nb_ev > nbmem) { |
f20baf8e | 577 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
578 | struct lttng_event *new_tmp_events; |
579 | size_t new_nbmem; | |
580 | ||
581 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 582 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
583 | nbmem, new_nbmem); |
584 | new_tmp_events = realloc(tmp_events, | |
585 | new_nbmem * sizeof(*new_tmp_events)); | |
586 | if (!new_tmp_events) { | |
022d91ba | 587 | PERROR("realloc agent events"); |
f20baf8e | 588 | ret = -ENOMEM; |
022d91ba | 589 | free(agent_events); |
428de77a | 590 | goto error_unlock; |
f20baf8e | 591 | } |
53efb85a MD |
592 | /* Zero the new memory */ |
593 | memset(new_tmp_events + nbmem, 0, | |
594 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
595 | nbmem = new_nbmem; | |
596 | tmp_events = new_tmp_events; | |
f20baf8e | 597 | } |
022d91ba | 598 | memcpy(tmp_events + count, agent_events, |
53efb85a | 599 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 600 | free(agent_events); |
f20baf8e DG |
601 | count += nb_ev; |
602 | } | |
603 | rcu_read_unlock(); | |
604 | ||
605 | ret = count; | |
606 | *events = tmp_events; | |
aae6255e | 607 | return ret; |
f20baf8e | 608 | |
428de77a MD |
609 | error_unlock: |
610 | rcu_read_unlock(); | |
f20baf8e | 611 | error: |
aae6255e | 612 | free(tmp_events); |
f20baf8e DG |
613 | return ret; |
614 | } | |
615 | ||
616 | /* | |
022d91ba | 617 | * Create a agent app object using the given PID. |
f20baf8e DG |
618 | * |
619 | * Return newly allocated object or else NULL on error. | |
620 | */ | |
fefd409b DG |
621 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
622 | struct lttcomm_sock *sock) | |
f20baf8e | 623 | { |
022d91ba | 624 | struct agent_app *app; |
f20baf8e DG |
625 | |
626 | assert(sock); | |
627 | ||
628 | app = zmalloc(sizeof(*app)); | |
629 | if (!app) { | |
022d91ba | 630 | PERROR("zmalloc agent create"); |
f20baf8e DG |
631 | goto error; |
632 | } | |
633 | ||
634 | app->pid = pid; | |
fefd409b | 635 | app->domain = domain; |
f20baf8e | 636 | app->sock = sock; |
f20baf8e DG |
637 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
638 | ||
639 | error: | |
640 | return app; | |
641 | } | |
642 | ||
643 | /* | |
022d91ba | 644 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
645 | * |
646 | * RCU read side lock MUST be acquired. | |
647 | * | |
648 | * Return object if found else NULL. | |
649 | */ | |
022d91ba | 650 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
651 | { |
652 | struct lttng_ht_node_ulong *node; | |
653 | struct lttng_ht_iter iter; | |
022d91ba | 654 | struct agent_app *app; |
f20baf8e DG |
655 | |
656 | assert(sock >= 0); | |
657 | ||
022d91ba | 658 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
f20baf8e DG |
659 | node = lttng_ht_iter_get_node_ulong(&iter); |
660 | if (node == NULL) { | |
661 | goto error; | |
662 | } | |
022d91ba | 663 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 664 | |
022d91ba | 665 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
666 | return app; |
667 | ||
668 | error: | |
022d91ba | 669 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
670 | return NULL; |
671 | } | |
672 | ||
673 | /* | |
022d91ba | 674 | * Add agent application object to the global hash table. |
f20baf8e | 675 | */ |
022d91ba | 676 | void agent_add_app(struct agent_app *app) |
f20baf8e DG |
677 | { |
678 | assert(app); | |
679 | ||
022d91ba | 680 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
f20baf8e DG |
681 | |
682 | rcu_read_lock(); | |
022d91ba | 683 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
684 | rcu_read_unlock(); |
685 | } | |
686 | ||
f20baf8e | 687 | /* |
022d91ba | 688 | * Delete agent application from the global hash table. |
022541e7 JG |
689 | * |
690 | * rcu_read_lock() must be held by the caller. | |
f20baf8e | 691 | */ |
022d91ba | 692 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
693 | { |
694 | int ret; | |
695 | struct lttng_ht_iter iter; | |
696 | ||
697 | assert(app); | |
698 | ||
022d91ba | 699 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
700 | |
701 | iter.iter.node = &app->node.node; | |
022d91ba | 702 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
f20baf8e DG |
703 | assert(!ret); |
704 | } | |
705 | ||
706 | /* | |
022d91ba DG |
707 | * Destroy a agent application object by detaching it from its corresponding |
708 | * UST app if one is connected by closing the socket. Finally, perform a | |
428de77a | 709 | * delayed memory reclaim. |
f20baf8e | 710 | */ |
022d91ba | 711 | void agent_destroy_app(struct agent_app *app) |
f20baf8e DG |
712 | { |
713 | assert(app); | |
714 | ||
715 | if (app->sock) { | |
716 | app->sock->ops->close(app->sock); | |
717 | lttcomm_destroy_sock(app->sock); | |
718 | } | |
719 | ||
022d91ba | 720 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
721 | } |
722 | ||
0475c50c | 723 | /* |
022d91ba | 724 | * Initialize an already allocated agent object. |
0475c50c DG |
725 | * |
726 | * Return 0 on success or else a negative errno value. | |
727 | */ | |
022d91ba | 728 | int agent_init(struct agent *agt) |
0475c50c DG |
729 | { |
730 | int ret; | |
731 | ||
022d91ba | 732 | assert(agt); |
0475c50c | 733 | |
022d91ba DG |
734 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
735 | if (!agt->events) { | |
0475c50c DG |
736 | ret = -ENOMEM; |
737 | goto error; | |
738 | } | |
fefd409b | 739 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
0475c50c DG |
740 | |
741 | return 0; | |
742 | ||
743 | error: | |
744 | return ret; | |
745 | } | |
746 | ||
fefd409b DG |
747 | /* |
748 | * Add agent object to the given hash table. | |
749 | */ | |
750 | void agent_add(struct agent *agt, struct lttng_ht *ht) | |
751 | { | |
752 | assert(agt); | |
753 | assert(ht); | |
754 | ||
755 | DBG3("Agent adding from domain %d", agt->domain); | |
756 | ||
757 | rcu_read_lock(); | |
758 | lttng_ht_add_unique_u64(ht, &agt->node); | |
759 | rcu_read_unlock(); | |
760 | } | |
761 | ||
762 | /* | |
763 | * Create an agent object for the given domain. | |
764 | * | |
765 | * Return the allocated agent or NULL on error. | |
766 | */ | |
767 | struct agent *agent_create(enum lttng_domain_type domain) | |
768 | { | |
769 | int ret; | |
770 | struct agent *agt; | |
771 | ||
772 | agt = zmalloc(sizeof(*agt)); | |
773 | if (!agt) { | |
774 | goto error; | |
775 | } | |
776 | agt->domain = domain; | |
777 | ||
778 | ret = agent_init(agt); | |
779 | if (ret < 0) { | |
780 | free(agt); | |
988ae332 | 781 | agt = NULL; |
fefd409b DG |
782 | goto error; |
783 | } | |
784 | ||
785 | error: | |
786 | return agt; | |
787 | } | |
788 | ||
0475c50c | 789 | /* |
022d91ba | 790 | * Create a newly allocated agent event data structure. If name is valid, it's |
0475c50c DG |
791 | * copied into the created event. |
792 | * | |
793 | * Return a new object else NULL on error. | |
794 | */ | |
022d91ba | 795 | struct agent_event *agent_create_event(const char *name, |
be6a6276 | 796 | struct lttng_filter_bytecode *filter) |
0475c50c | 797 | { |
022d91ba | 798 | struct agent_event *event; |
0475c50c | 799 | |
022d91ba | 800 | DBG3("Agent create new event with name %s", name); |
0475c50c DG |
801 | |
802 | event = zmalloc(sizeof(*event)); | |
803 | if (!event) { | |
804 | goto error; | |
805 | } | |
806 | ||
807 | if (name) { | |
808 | strncpy(event->name, name, sizeof(event->name)); | |
809 | event->name[sizeof(event->name) - 1] = '\0'; | |
f20baf8e | 810 | lttng_ht_node_init_str(&event->node, event->name); |
0475c50c DG |
811 | } |
812 | ||
be6a6276 DG |
813 | if (filter) { |
814 | event->filter = filter; | |
815 | } | |
816 | ||
0475c50c DG |
817 | error: |
818 | return event; | |
819 | } | |
820 | ||
821 | /* | |
022d91ba | 822 | * Unique add of a agent event to an agent object. |
0475c50c | 823 | */ |
022d91ba | 824 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c DG |
825 | { |
826 | assert(event); | |
022d91ba DG |
827 | assert(agt); |
828 | assert(agt->events); | |
0475c50c | 829 | |
022d91ba | 830 | DBG3("Agent adding event %s", event->name); |
0475c50c | 831 | |
f20baf8e | 832 | rcu_read_lock(); |
022d91ba | 833 | add_unique_agent_event(agt->events, event); |
f20baf8e | 834 | rcu_read_unlock(); |
022d91ba | 835 | agt->being_used = 1; |
0475c50c DG |
836 | } |
837 | ||
838 | /* | |
022d91ba | 839 | * Find a agent event in the given agent using name. |
4a4ab2c3 DG |
840 | * |
841 | * RCU read side lock MUST be acquired. | |
842 | * | |
843 | * Return object if found else NULL. | |
844 | */ | |
022d91ba DG |
845 | struct agent_event *agent_find_event_by_name(const char *name, |
846 | struct agent *agt) | |
4a4ab2c3 DG |
847 | { |
848 | struct lttng_ht_node_str *node; | |
849 | struct lttng_ht_iter iter; | |
850 | struct lttng_ht *ht; | |
022d91ba | 851 | struct agent_ht_key key; |
4a4ab2c3 DG |
852 | |
853 | assert(name); | |
022d91ba DG |
854 | assert(agt); |
855 | assert(agt->events); | |
4a4ab2c3 | 856 | |
022d91ba | 857 | ht = agt->events; |
4a4ab2c3 DG |
858 | key.name = name; |
859 | ||
860 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
861 | ht_match_event_by_name, &key, &iter.iter); | |
862 | node = lttng_ht_iter_get_node_str(&iter); | |
863 | if (node == NULL) { | |
864 | goto error; | |
865 | } | |
866 | ||
022d91ba DG |
867 | DBG3("Agent event found %s by name.", name); |
868 | return caa_container_of(node, struct agent_event, node); | |
4a4ab2c3 DG |
869 | |
870 | error: | |
022d91ba | 871 | DBG3("Agent NOT found by name %s.", name); |
4a4ab2c3 DG |
872 | return NULL; |
873 | } | |
874 | ||
875 | /* | |
022d91ba | 876 | * Find a agent event in the given agent using name and loglevel. |
0475c50c DG |
877 | * |
878 | * RCU read side lock MUST be acquired. | |
879 | * | |
880 | * Return object if found else NULL. | |
881 | */ | |
022d91ba DG |
882 | struct agent_event *agent_find_event(const char *name, int loglevel, |
883 | struct agent *agt) | |
0475c50c DG |
884 | { |
885 | struct lttng_ht_node_str *node; | |
886 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 887 | struct lttng_ht *ht; |
022d91ba | 888 | struct agent_ht_key key; |
0475c50c DG |
889 | |
890 | assert(name); | |
022d91ba DG |
891 | assert(agt); |
892 | assert(agt->events); | |
0475c50c | 893 | |
022d91ba | 894 | ht = agt->events; |
4a4ab2c3 DG |
895 | key.name = name; |
896 | key.loglevel = loglevel; | |
897 | ||
898 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
899 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
900 | node = lttng_ht_iter_get_node_str(&iter); |
901 | if (node == NULL) { | |
902 | goto error; | |
903 | } | |
904 | ||
022d91ba DG |
905 | DBG3("Agent event found %s.", name); |
906 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
907 | |
908 | error: | |
e03385f8 | 909 | DBG3("Agent event NOT found %s.", name); |
0475c50c DG |
910 | return NULL; |
911 | } | |
912 | ||
0475c50c | 913 | /* |
022d91ba DG |
914 | * Free given agent event. This event must not be globally visible at this |
915 | * point (only expected to be used on failure just after event creation). After | |
916 | * this call, the pointer is not usable anymore. | |
0475c50c | 917 | */ |
022d91ba | 918 | void agent_destroy_event(struct agent_event *event) |
0475c50c DG |
919 | { |
920 | assert(event); | |
921 | ||
0f9981d0 | 922 | free(event->filter); |
8a1032bc | 923 | free(event->filter_expression); |
0475c50c DG |
924 | free(event); |
925 | } | |
926 | ||
927 | /* | |
b7d46972 | 928 | * Destroy an agent completely. |
0475c50c | 929 | */ |
022d91ba | 930 | void agent_destroy(struct agent *agt) |
0475c50c DG |
931 | { |
932 | struct lttng_ht_node_str *node; | |
933 | struct lttng_ht_iter iter; | |
934 | ||
022d91ba | 935 | assert(agt); |
0475c50c | 936 | |
022d91ba | 937 | DBG3("Agent destroy"); |
0475c50c DG |
938 | |
939 | /* | |
940 | * Just ignore if no events hash table exists. This is possible if for | |
022d91ba | 941 | * instance an agent object was allocated but not initialized. |
0475c50c | 942 | */ |
022d91ba | 943 | if (!agt->events) { |
0475c50c DG |
944 | return; |
945 | } | |
946 | ||
947 | rcu_read_lock(); | |
022d91ba | 948 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 949 | int ret; |
022d91ba | 950 | struct agent_event *event; |
29c0fd4d DG |
951 | |
952 | /* | |
953 | * When destroying an event, we have to try to disable it on the agent | |
954 | * side so the event stops generating data. The return value is not | |
955 | * important since we have to continue anyway destroying the object. | |
956 | */ | |
022d91ba DG |
957 | event = caa_container_of(node, struct agent_event, node); |
958 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 959 | |
022d91ba | 960 | ret = lttng_ht_del(agt->events, &iter); |
0475c50c | 961 | assert(!ret); |
022d91ba | 962 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c DG |
963 | } |
964 | rcu_read_unlock(); | |
965 | ||
6fe6fff5 | 966 | ht_cleanup_push(agt->events); |
b7d46972 | 967 | free(agt); |
f20baf8e DG |
968 | } |
969 | ||
970 | /* | |
db17cf0e | 971 | * Allocate agent_apps_ht_by_sock. |
f20baf8e | 972 | */ |
db17cf0e | 973 | int agent_app_ht_alloc(void) |
f20baf8e | 974 | { |
db17cf0e JG |
975 | int ret = 0; |
976 | ||
022d91ba DG |
977 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
978 | if (!agent_apps_ht_by_sock) { | |
db17cf0e | 979 | ret = -1; |
f20baf8e DG |
980 | } |
981 | ||
db17cf0e JG |
982 | return ret; |
983 | } | |
984 | ||
985 | /* | |
986 | * Destroy a agent application by socket. | |
987 | */ | |
988 | void agent_destroy_app_by_sock(int sock) | |
989 | { | |
990 | struct agent_app *app; | |
991 | ||
992 | assert(sock >= 0); | |
993 | ||
994 | /* | |
995 | * Not finding an application is a very important error that should NEVER | |
996 | * happen. The hash table deletion is ONLY done through this call when the | |
997 | * main sessiond thread is torn down. | |
998 | */ | |
999 | rcu_read_lock(); | |
1000 | app = agent_find_app_by_sock(sock); | |
1001 | assert(app); | |
1002 | ||
1003 | /* RCU read side lock is assumed to be held by this function. */ | |
1004 | agent_delete_app(app); | |
1005 | ||
1006 | /* The application is freed in a RCU call but the socket is closed here. */ | |
1007 | agent_destroy_app(app); | |
1008 | rcu_read_unlock(); | |
1009 | } | |
1010 | ||
1011 | /* | |
1012 | * Clean-up the agent app hash table and destroy it. | |
1013 | */ | |
1014 | void agent_app_ht_clean(void) | |
1015 | { | |
1016 | struct lttng_ht_node_ulong *node; | |
1017 | struct lttng_ht_iter iter; | |
1018 | ||
14436168 JG |
1019 | if (!agent_apps_ht_by_sock) { |
1020 | return; | |
1021 | } | |
db17cf0e JG |
1022 | rcu_read_lock(); |
1023 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) { | |
1024 | struct agent_app *app; | |
1025 | ||
1026 | app = caa_container_of(node, struct agent_app, node); | |
1027 | agent_destroy_app_by_sock(app->sock->fd); | |
1028 | } | |
1029 | rcu_read_unlock(); | |
1030 | ||
1031 | lttng_ht_destroy(agent_apps_ht_by_sock); | |
f20baf8e DG |
1032 | } |
1033 | ||
1034 | /* | |
022d91ba | 1035 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
1036 | * |
1037 | * Note that this function is most likely to be used with a tracing session | |
1038 | * thus the caller should make sure to hold the appropriate lock(s). | |
1039 | */ | |
022d91ba | 1040 | void agent_update(struct agent *agt, int sock) |
f20baf8e DG |
1041 | { |
1042 | int ret; | |
022d91ba DG |
1043 | struct agent_app *app; |
1044 | struct agent_event *event; | |
f20baf8e DG |
1045 | struct lttng_ht_iter iter; |
1046 | ||
022d91ba | 1047 | assert(agt); |
f20baf8e DG |
1048 | assert(sock >= 0); |
1049 | ||
022d91ba | 1050 | DBG("Agent updating app socket %d", sock); |
f20baf8e DG |
1051 | |
1052 | rcu_read_lock(); | |
022d91ba | 1053 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e DG |
1054 | /* Skip event if disabled. */ |
1055 | if (!event->enabled) { | |
1056 | continue; | |
1057 | } | |
1058 | ||
022d91ba | 1059 | app = agent_find_app_by_sock(sock); |
f20baf8e DG |
1060 | /* |
1061 | * We are in the registration path thus if the application is gone, | |
1062 | * there is a serious code flow error. | |
1063 | */ | |
1064 | assert(app); | |
1065 | ||
1066 | ret = enable_event(app, event); | |
1067 | if (ret != LTTNG_OK) { | |
022d91ba | 1068 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
1069 | event->name, app->pid, app->sock->fd); |
1070 | /* Let's try the others here and don't assume the app is dead. */ | |
1071 | continue; | |
1072 | } | |
1073 | } | |
1074 | rcu_read_unlock(); | |
0475c50c | 1075 | } |