Commit | Line | Data |
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0475c50c DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
6c1c0768 | 19 | #define _LGPL_SOURCE |
0475c50c | 20 | #include <assert.h> |
f20baf8e | 21 | #include <urcu/uatomic.h> |
0475c50c DG |
22 | |
23 | #include <common/common.h> | |
022d91ba | 24 | #include <common/sessiond-comm/agent.h> |
0475c50c | 25 | |
f263b7fd JD |
26 | #include <common/compat/endian.h> |
27 | ||
022d91ba | 28 | #include "agent.h" |
f20baf8e | 29 | #include "ust-app.h" |
0475c50c DG |
30 | #include "utils.h" |
31 | ||
4a4ab2c3 DG |
32 | /* |
33 | * Match function for the events hash table lookup by name. | |
34 | */ | |
35 | static int ht_match_event_by_name(struct cds_lfht_node *node, | |
36 | const void *_key) | |
37 | { | |
022d91ba DG |
38 | struct agent_event *event; |
39 | const struct agent_ht_key *key; | |
4a4ab2c3 DG |
40 | |
41 | assert(node); | |
42 | assert(_key); | |
43 | ||
022d91ba | 44 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
45 | key = _key; |
46 | ||
47 | /* Match 1 elements of the key: name. */ | |
48 | ||
49 | /* Event name */ | |
50 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
51 | goto no_match; | |
52 | } | |
53 | /* Match. */ | |
54 | return 1; | |
55 | ||
56 | no_match: | |
57 | return 0; | |
58 | } | |
59 | ||
60 | /* | |
61 | * Match function for the events hash table lookup by name and loglevel. | |
62 | */ | |
63 | static int ht_match_event(struct cds_lfht_node *node, | |
64 | const void *_key) | |
65 | { | |
022d91ba DG |
66 | struct agent_event *event; |
67 | const struct agent_ht_key *key; | |
36c63cc4 | 68 | int ll_match; |
4a4ab2c3 DG |
69 | |
70 | assert(node); | |
71 | assert(_key); | |
72 | ||
022d91ba | 73 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
74 | key = _key; |
75 | ||
76 | /* Match 2 elements of the key: name and loglevel. */ | |
77 | ||
78 | /* Event name */ | |
79 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
80 | goto no_match; | |
81 | } | |
82 | ||
15f57f85 | 83 | /* Event loglevel value and type. */ |
36c63cc4 PP |
84 | ll_match = loglevels_match(event->loglevel_type, |
85 | event->loglevel_value, key->loglevel_type, | |
86 | key->loglevel_value, LTTNG_EVENT_LOGLEVEL_ALL); | |
87 | ||
88 | if (!ll_match) { | |
4a4ab2c3 DG |
89 | goto no_match; |
90 | } | |
15f57f85 | 91 | |
ade8d7e3 AM |
92 | /* Filter expression */ |
93 | if (strncmp(event->filter_expression, key->filter_expression, | |
94 | strlen(event->filter_expression)) != 0) { | |
95 | goto no_match; | |
96 | } | |
97 | ||
4a4ab2c3 DG |
98 | return 1; |
99 | ||
100 | no_match: | |
101 | return 0; | |
102 | } | |
103 | ||
104 | /* | |
022d91ba | 105 | * Add unique agent event based on the event name and loglevel. |
4a4ab2c3 | 106 | */ |
022d91ba DG |
107 | static void add_unique_agent_event(struct lttng_ht *ht, |
108 | struct agent_event *event) | |
4a4ab2c3 DG |
109 | { |
110 | struct cds_lfht_node *node_ptr; | |
022d91ba | 111 | struct agent_ht_key key; |
4a4ab2c3 DG |
112 | |
113 | assert(ht); | |
114 | assert(ht->ht); | |
115 | assert(event); | |
116 | ||
117 | key.name = event->name; | |
79a065a0 | 118 | key.loglevel_value = event->loglevel_value; |
15f57f85 | 119 | key.loglevel_type = event->loglevel_type; |
ade8d7e3 | 120 | key.filter_expression = event->filter_expression; |
4a4ab2c3 DG |
121 | |
122 | node_ptr = cds_lfht_add_unique(ht->ht, | |
123 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
124 | ht_match_event, &key, &event->node.node); | |
125 | assert(node_ptr == &event->node.node); | |
126 | } | |
127 | ||
0475c50c | 128 | /* |
022d91ba | 129 | * URCU delayed agent event reclaim. |
0475c50c | 130 | */ |
022d91ba | 131 | static void destroy_event_agent_rcu(struct rcu_head *head) |
0475c50c DG |
132 | { |
133 | struct lttng_ht_node_str *node = | |
134 | caa_container_of(head, struct lttng_ht_node_str, head); | |
022d91ba DG |
135 | struct agent_event *event = |
136 | caa_container_of(node, struct agent_event, node); | |
0475c50c | 137 | |
b7478632 | 138 | agent_destroy_event(event); |
0475c50c DG |
139 | } |
140 | ||
f20baf8e | 141 | /* |
022d91ba | 142 | * URCU delayed agent app reclaim. |
f20baf8e | 143 | */ |
022d91ba | 144 | static void destroy_app_agent_rcu(struct rcu_head *head) |
f20baf8e DG |
145 | { |
146 | struct lttng_ht_node_ulong *node = | |
147 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
022d91ba DG |
148 | struct agent_app *app = |
149 | caa_container_of(node, struct agent_app, node); | |
f20baf8e DG |
150 | |
151 | free(app); | |
152 | } | |
153 | ||
154 | /* | |
022d91ba DG |
155 | * Communication with the agent. Send the message header to the given socket in |
156 | * big endian. | |
f20baf8e DG |
157 | * |
158 | * Return 0 on success or else a negative errno message of sendmsg() op. | |
159 | */ | |
160 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, | |
161 | uint32_t cmd, uint32_t cmd_version) | |
162 | { | |
163 | int ret; | |
164 | ssize_t size; | |
022d91ba | 165 | struct lttcomm_agent_hdr msg; |
f20baf8e DG |
166 | |
167 | assert(sock); | |
168 | ||
53efb85a | 169 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
170 | msg.data_size = htobe64(data_size); |
171 | msg.cmd = htobe32(cmd); | |
172 | msg.cmd_version = htobe32(cmd_version); | |
173 | ||
174 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
175 | if (size < sizeof(msg)) { | |
176 | ret = -errno; | |
177 | goto error; | |
178 | } | |
179 | ret = 0; | |
180 | ||
181 | error: | |
182 | return ret; | |
183 | } | |
184 | ||
185 | /* | |
022d91ba DG |
186 | * Communication call with the agent. Send the payload to the given socket. The |
187 | * header MUST be sent prior to this call. | |
f20baf8e DG |
188 | * |
189 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
190 | */ | |
191 | static int send_payload(struct lttcomm_sock *sock, void *data, | |
192 | size_t size) | |
193 | { | |
194 | int ret; | |
195 | ssize_t len; | |
196 | ||
197 | assert(sock); | |
198 | assert(data); | |
199 | ||
200 | len = sock->ops->sendmsg(sock, data, size, 0); | |
201 | if (len < size) { | |
202 | ret = -errno; | |
203 | goto error; | |
204 | } | |
205 | ret = 0; | |
206 | ||
207 | error: | |
208 | return ret; | |
209 | } | |
210 | ||
211 | /* | |
022d91ba DG |
212 | * Communication call with the agent. Receive reply from the agent using the |
213 | * given socket. | |
f20baf8e DG |
214 | * |
215 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
216 | */ | |
217 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
218 | { | |
219 | int ret; | |
220 | ssize_t len; | |
221 | ||
222 | assert(sock); | |
223 | assert(buf); | |
224 | ||
225 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
226 | if (len < size) { | |
227 | ret = -errno; | |
228 | goto error; | |
229 | } | |
230 | ret = 0; | |
231 | ||
232 | error: | |
233 | return ret; | |
234 | } | |
235 | ||
3c6a091f | 236 | /* |
428de77a | 237 | * Internal event listing for a given app. Populate events. |
3c6a091f DG |
238 | * |
239 | * Return number of element in the list or else a negative LTTNG_ERR* code. | |
428de77a MD |
240 | * On success, the caller is responsible for freeing the memory |
241 | * allocated for "events". | |
3c6a091f | 242 | */ |
022d91ba | 243 | static ssize_t list_events(struct agent_app *app, struct lttng_event **events) |
3c6a091f DG |
244 | { |
245 | int ret, i, len = 0, offset = 0; | |
246 | uint32_t nb_event; | |
247 | size_t data_size; | |
248 | struct lttng_event *tmp_events = NULL; | |
022d91ba DG |
249 | struct lttcomm_agent_list_reply *reply = NULL; |
250 | struct lttcomm_agent_list_reply_hdr reply_hdr; | |
3c6a091f DG |
251 | |
252 | assert(app); | |
253 | assert(app->sock); | |
254 | assert(events); | |
255 | ||
022d91ba | 256 | DBG2("Agent listing events for app pid: %d and socket %d", app->pid, |
3c6a091f DG |
257 | app->sock->fd); |
258 | ||
022d91ba | 259 | ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0); |
3c6a091f DG |
260 | if (ret < 0) { |
261 | goto error_io; | |
262 | } | |
263 | ||
264 | /* Get list header so we know how much we'll receive. */ | |
265 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); | |
266 | if (ret < 0) { | |
267 | goto error_io; | |
268 | } | |
269 | ||
270 | switch (be32toh(reply_hdr.ret_code)) { | |
022d91ba | 271 | case AGENT_RET_CODE_SUCCESS: |
3c6a091f DG |
272 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
273 | break; | |
274 | default: | |
022d91ba | 275 | ERR("Agent returned an unknown code: %" PRIu32, |
3c6a091f DG |
276 | be32toh(reply_hdr.ret_code)); |
277 | ret = LTTNG_ERR_FATAL; | |
278 | goto error; | |
279 | } | |
280 | ||
281 | reply = zmalloc(data_size); | |
282 | if (!reply) { | |
283 | ret = LTTNG_ERR_NOMEM; | |
284 | goto error; | |
285 | } | |
286 | ||
287 | /* Get the list with the appropriate data size. */ | |
288 | ret = recv_reply(app->sock, reply, data_size); | |
289 | if (ret < 0) { | |
290 | goto error_io; | |
291 | } | |
292 | ||
293 | nb_event = be32toh(reply->nb_event); | |
294 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); | |
295 | if (!tmp_events) { | |
296 | ret = LTTNG_ERR_NOMEM; | |
297 | goto error; | |
298 | } | |
299 | ||
300 | for (i = 0; i < nb_event; i++) { | |
301 | offset += len; | |
302 | strncpy(tmp_events[i].name, reply->payload + offset, | |
303 | sizeof(tmp_events[i].name)); | |
304 | tmp_events[i].pid = app->pid; | |
305 | tmp_events[i].enabled = -1; | |
306 | len = strlen(reply->payload + offset) + 1; | |
307 | } | |
308 | ||
309 | *events = tmp_events; | |
310 | ||
311 | free(reply); | |
312 | return nb_event; | |
313 | ||
314 | error_io: | |
315 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
316 | error: | |
317 | free(reply); | |
318 | free(tmp_events); | |
319 | return -ret; | |
320 | ||
321 | } | |
322 | ||
f20baf8e | 323 | /* |
022d91ba DG |
324 | * Internal enable agent event on a agent application. This function |
325 | * communicates with the agent to enable a given event. | |
f20baf8e DG |
326 | * |
327 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
328 | */ | |
022d91ba | 329 | static int enable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
330 | { |
331 | int ret; | |
332 | uint64_t data_size; | |
022d91ba DG |
333 | struct lttcomm_agent_enable msg; |
334 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
335 | |
336 | assert(app); | |
337 | assert(app->sock); | |
338 | assert(event); | |
339 | ||
022d91ba | 340 | DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
341 | app->pid, app->sock->fd); |
342 | ||
343 | data_size = sizeof(msg); | |
344 | ||
022d91ba | 345 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
f20baf8e DG |
346 | if (ret < 0) { |
347 | goto error_io; | |
348 | } | |
349 | ||
53efb85a | 350 | memset(&msg, 0, sizeof(msg)); |
79a065a0 | 351 | msg.loglevel_value = event->loglevel_value; |
b2064f54 | 352 | msg.loglevel_type = event->loglevel_type; |
f20baf8e DG |
353 | strncpy(msg.name, event->name, sizeof(msg.name)); |
354 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
355 | if (ret < 0) { | |
356 | goto error_io; | |
357 | } | |
358 | ||
359 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
360 | if (ret < 0) { | |
361 | goto error_io; | |
362 | } | |
363 | ||
364 | switch (be32toh(reply.ret_code)) { | |
022d91ba | 365 | case AGENT_RET_CODE_SUCCESS: |
f20baf8e | 366 | break; |
022d91ba | 367 | case AGENT_RET_CODE_UNKNOWN_NAME: |
f20baf8e DG |
368 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
369 | goto error; | |
370 | default: | |
022d91ba | 371 | ERR("Agent returned an unknown code: %" PRIu32, |
f20baf8e DG |
372 | be32toh(reply.ret_code)); |
373 | ret = LTTNG_ERR_FATAL; | |
374 | goto error; | |
375 | } | |
376 | ||
377 | return LTTNG_OK; | |
378 | ||
379 | error_io: | |
380 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
381 | error: | |
382 | return ret; | |
383 | } | |
384 | ||
385 | /* | |
022d91ba DG |
386 | * Internal disable agent event call on a agent application. This function |
387 | * communicates with the agent to disable a given event. | |
f20baf8e DG |
388 | * |
389 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
390 | */ | |
022d91ba | 391 | static int disable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
392 | { |
393 | int ret; | |
394 | uint64_t data_size; | |
022d91ba DG |
395 | struct lttcomm_agent_disable msg; |
396 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
397 | |
398 | assert(app); | |
399 | assert(app->sock); | |
400 | assert(event); | |
401 | ||
022d91ba | 402 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
403 | app->pid, app->sock->fd); |
404 | ||
405 | data_size = sizeof(msg); | |
1de8c2e7 MD |
406 | memset(&msg, 0, sizeof(msg)); |
407 | if (lttng_strncpy(msg.name, event->name, sizeof(msg.name))) { | |
408 | ret = LTTNG_ERR_INVALID; | |
409 | goto error; | |
410 | } | |
f20baf8e | 411 | |
022d91ba | 412 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
f20baf8e DG |
413 | if (ret < 0) { |
414 | goto error_io; | |
415 | } | |
416 | ||
f20baf8e DG |
417 | ret = send_payload(app->sock, &msg, sizeof(msg)); |
418 | if (ret < 0) { | |
419 | goto error_io; | |
420 | } | |
421 | ||
422 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
423 | if (ret < 0) { | |
424 | goto error_io; | |
425 | } | |
426 | ||
427 | switch (be32toh(reply.ret_code)) { | |
022d91ba DG |
428 | case AGENT_RET_CODE_SUCCESS: |
429 | break; | |
430 | case AGENT_RET_CODE_UNKNOWN_NAME: | |
431 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
432 | goto error; | |
433 | default: | |
434 | ERR("Agent returned an unknown code: %" PRIu32, | |
435 | be32toh(reply.ret_code)); | |
436 | ret = LTTNG_ERR_FATAL; | |
437 | goto error; | |
f20baf8e DG |
438 | } |
439 | ||
440 | return LTTNG_OK; | |
441 | ||
442 | error_io: | |
443 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
444 | error: | |
445 | return ret; | |
446 | } | |
447 | ||
1b500e7a | 448 | /* |
022d91ba | 449 | * Send back the registration DONE command to a given agent application. |
1b500e7a DG |
450 | * |
451 | * Return 0 on success or else a negative value. | |
452 | */ | |
022d91ba | 453 | int agent_send_registration_done(struct agent_app *app) |
1b500e7a DG |
454 | { |
455 | assert(app); | |
456 | assert(app->sock); | |
457 | ||
022d91ba | 458 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
1b500e7a | 459 | |
7460a4a9 | 460 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0); |
1b500e7a DG |
461 | } |
462 | ||
f20baf8e | 463 | /* |
022d91ba | 464 | * Enable agent event on every agent applications registered with the session |
f20baf8e DG |
465 | * daemon. |
466 | * | |
467 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
468 | */ | |
fefd409b DG |
469 | int agent_enable_event(struct agent_event *event, |
470 | enum lttng_domain_type domain) | |
f20baf8e DG |
471 | { |
472 | int ret; | |
022d91ba | 473 | struct agent_app *app; |
f20baf8e DG |
474 | struct lttng_ht_iter iter; |
475 | ||
476 | assert(event); | |
477 | ||
478 | rcu_read_lock(); | |
479 | ||
022d91ba | 480 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 481 | node.node) { |
fefd409b DG |
482 | if (app->domain != domain) { |
483 | continue; | |
484 | } | |
485 | ||
022d91ba | 486 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
487 | ret = enable_event(app, event); |
488 | if (ret != LTTNG_OK) { | |
489 | goto error; | |
490 | } | |
f20baf8e DG |
491 | } |
492 | ||
3c6a091f | 493 | event->enabled = 1; |
f20baf8e DG |
494 | ret = LTTNG_OK; |
495 | ||
496 | error: | |
497 | rcu_read_unlock(); | |
498 | return ret; | |
499 | } | |
500 | ||
501 | /* | |
022d91ba | 502 | * Disable agent event on every agent applications registered with the session |
f20baf8e DG |
503 | * daemon. |
504 | * | |
505 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
506 | */ | |
fefd409b DG |
507 | int agent_disable_event(struct agent_event *event, |
508 | enum lttng_domain_type domain) | |
f20baf8e | 509 | { |
515a4169 | 510 | int ret = LTTNG_OK; |
022d91ba | 511 | struct agent_app *app; |
f20baf8e DG |
512 | struct lttng_ht_iter iter; |
513 | ||
514 | assert(event); | |
515a4169 JG |
515 | if (!event->enabled) { |
516 | goto end; | |
517 | } | |
f20baf8e DG |
518 | |
519 | rcu_read_lock(); | |
520 | ||
022d91ba | 521 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 522 | node.node) { |
fefd409b DG |
523 | if (app->domain != domain) { |
524 | continue; | |
525 | } | |
526 | ||
022d91ba | 527 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
528 | ret = disable_event(app, event); |
529 | if (ret != LTTNG_OK) { | |
530 | goto error; | |
531 | } | |
f20baf8e DG |
532 | } |
533 | ||
3c6a091f | 534 | event->enabled = 0; |
f20baf8e DG |
535 | |
536 | error: | |
537 | rcu_read_unlock(); | |
515a4169 | 538 | end: |
f20baf8e DG |
539 | return ret; |
540 | } | |
541 | ||
542 | /* | |
022d91ba DG |
543 | * Ask every agent for the list of possible event. Events is allocated with the |
544 | * events of every agent application. | |
f20baf8e DG |
545 | * |
546 | * Return the number of events or else a negative value. | |
547 | */ | |
f60140a1 DG |
548 | int agent_list_events(struct lttng_event **events, |
549 | enum lttng_domain_type domain) | |
f20baf8e DG |
550 | { |
551 | int ret; | |
552 | size_t nbmem, count = 0; | |
022d91ba | 553 | struct agent_app *app; |
aae6255e | 554 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
555 | struct lttng_ht_iter iter; |
556 | ||
557 | assert(events); | |
558 | ||
0e115563 DG |
559 | DBG2("Agent listing events for domain %d", domain); |
560 | ||
f20baf8e DG |
561 | nbmem = UST_APP_EVENT_LIST_SIZE; |
562 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
563 | if (!tmp_events) { | |
022d91ba | 564 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
565 | ret = -ENOMEM; |
566 | goto error; | |
567 | } | |
568 | ||
569 | rcu_read_lock(); | |
022d91ba | 570 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
571 | node.node) { |
572 | ssize_t nb_ev; | |
022d91ba | 573 | struct lttng_event *agent_events; |
f20baf8e | 574 | |
f60140a1 DG |
575 | /* Skip domain not asked by the list. */ |
576 | if (app->domain != domain) { | |
577 | continue; | |
578 | } | |
579 | ||
022d91ba | 580 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
581 | if (nb_ev < 0) { |
582 | ret = nb_ev; | |
428de77a | 583 | goto error_unlock; |
f20baf8e DG |
584 | } |
585 | ||
53efb85a | 586 | if (count + nb_ev > nbmem) { |
f20baf8e | 587 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
588 | struct lttng_event *new_tmp_events; |
589 | size_t new_nbmem; | |
590 | ||
591 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 592 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
593 | nbmem, new_nbmem); |
594 | new_tmp_events = realloc(tmp_events, | |
595 | new_nbmem * sizeof(*new_tmp_events)); | |
596 | if (!new_tmp_events) { | |
022d91ba | 597 | PERROR("realloc agent events"); |
f20baf8e | 598 | ret = -ENOMEM; |
022d91ba | 599 | free(agent_events); |
428de77a | 600 | goto error_unlock; |
f20baf8e | 601 | } |
53efb85a MD |
602 | /* Zero the new memory */ |
603 | memset(new_tmp_events + nbmem, 0, | |
604 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
605 | nbmem = new_nbmem; | |
606 | tmp_events = new_tmp_events; | |
f20baf8e | 607 | } |
022d91ba | 608 | memcpy(tmp_events + count, agent_events, |
53efb85a | 609 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 610 | free(agent_events); |
f20baf8e DG |
611 | count += nb_ev; |
612 | } | |
613 | rcu_read_unlock(); | |
614 | ||
615 | ret = count; | |
616 | *events = tmp_events; | |
aae6255e | 617 | return ret; |
f20baf8e | 618 | |
428de77a MD |
619 | error_unlock: |
620 | rcu_read_unlock(); | |
f20baf8e | 621 | error: |
aae6255e | 622 | free(tmp_events); |
f20baf8e DG |
623 | return ret; |
624 | } | |
625 | ||
626 | /* | |
022d91ba | 627 | * Create a agent app object using the given PID. |
f20baf8e DG |
628 | * |
629 | * Return newly allocated object or else NULL on error. | |
630 | */ | |
fefd409b DG |
631 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
632 | struct lttcomm_sock *sock) | |
f20baf8e | 633 | { |
022d91ba | 634 | struct agent_app *app; |
f20baf8e DG |
635 | |
636 | assert(sock); | |
637 | ||
638 | app = zmalloc(sizeof(*app)); | |
639 | if (!app) { | |
022d91ba | 640 | PERROR("zmalloc agent create"); |
f20baf8e DG |
641 | goto error; |
642 | } | |
643 | ||
644 | app->pid = pid; | |
fefd409b | 645 | app->domain = domain; |
f20baf8e | 646 | app->sock = sock; |
f20baf8e DG |
647 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
648 | ||
649 | error: | |
650 | return app; | |
651 | } | |
652 | ||
653 | /* | |
022d91ba | 654 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
655 | * |
656 | * RCU read side lock MUST be acquired. | |
657 | * | |
658 | * Return object if found else NULL. | |
659 | */ | |
022d91ba | 660 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
661 | { |
662 | struct lttng_ht_node_ulong *node; | |
663 | struct lttng_ht_iter iter; | |
022d91ba | 664 | struct agent_app *app; |
f20baf8e DG |
665 | |
666 | assert(sock >= 0); | |
667 | ||
022d91ba | 668 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
f20baf8e DG |
669 | node = lttng_ht_iter_get_node_ulong(&iter); |
670 | if (node == NULL) { | |
671 | goto error; | |
672 | } | |
022d91ba | 673 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 674 | |
022d91ba | 675 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
676 | return app; |
677 | ||
678 | error: | |
022d91ba | 679 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
680 | return NULL; |
681 | } | |
682 | ||
683 | /* | |
022d91ba | 684 | * Add agent application object to the global hash table. |
f20baf8e | 685 | */ |
022d91ba | 686 | void agent_add_app(struct agent_app *app) |
f20baf8e DG |
687 | { |
688 | assert(app); | |
689 | ||
022d91ba | 690 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
f20baf8e DG |
691 | |
692 | rcu_read_lock(); | |
022d91ba | 693 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
694 | rcu_read_unlock(); |
695 | } | |
696 | ||
f20baf8e | 697 | /* |
022d91ba | 698 | * Delete agent application from the global hash table. |
a0a9a2fe JG |
699 | * |
700 | * rcu_read_lock() must be held by the caller. | |
f20baf8e | 701 | */ |
022d91ba | 702 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
703 | { |
704 | int ret; | |
705 | struct lttng_ht_iter iter; | |
706 | ||
707 | assert(app); | |
708 | ||
022d91ba | 709 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
710 | |
711 | iter.iter.node = &app->node.node; | |
022d91ba | 712 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
f20baf8e DG |
713 | assert(!ret); |
714 | } | |
715 | ||
716 | /* | |
022d91ba DG |
717 | * Destroy a agent application object by detaching it from its corresponding |
718 | * UST app if one is connected by closing the socket. Finally, perform a | |
428de77a | 719 | * delayed memory reclaim. |
f20baf8e | 720 | */ |
022d91ba | 721 | void agent_destroy_app(struct agent_app *app) |
f20baf8e DG |
722 | { |
723 | assert(app); | |
724 | ||
725 | if (app->sock) { | |
726 | app->sock->ops->close(app->sock); | |
727 | lttcomm_destroy_sock(app->sock); | |
728 | } | |
729 | ||
022d91ba | 730 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
731 | } |
732 | ||
0475c50c | 733 | /* |
022d91ba | 734 | * Initialize an already allocated agent object. |
0475c50c DG |
735 | * |
736 | * Return 0 on success or else a negative errno value. | |
737 | */ | |
022d91ba | 738 | int agent_init(struct agent *agt) |
0475c50c DG |
739 | { |
740 | int ret; | |
741 | ||
022d91ba | 742 | assert(agt); |
0475c50c | 743 | |
022d91ba DG |
744 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
745 | if (!agt->events) { | |
0475c50c DG |
746 | ret = -ENOMEM; |
747 | goto error; | |
748 | } | |
fefd409b | 749 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
0475c50c DG |
750 | |
751 | return 0; | |
752 | ||
753 | error: | |
754 | return ret; | |
755 | } | |
756 | ||
fefd409b DG |
757 | /* |
758 | * Add agent object to the given hash table. | |
759 | */ | |
760 | void agent_add(struct agent *agt, struct lttng_ht *ht) | |
761 | { | |
762 | assert(agt); | |
763 | assert(ht); | |
764 | ||
765 | DBG3("Agent adding from domain %d", agt->domain); | |
766 | ||
767 | rcu_read_lock(); | |
768 | lttng_ht_add_unique_u64(ht, &agt->node); | |
769 | rcu_read_unlock(); | |
770 | } | |
771 | ||
772 | /* | |
773 | * Create an agent object for the given domain. | |
774 | * | |
775 | * Return the allocated agent or NULL on error. | |
776 | */ | |
777 | struct agent *agent_create(enum lttng_domain_type domain) | |
778 | { | |
779 | int ret; | |
780 | struct agent *agt; | |
781 | ||
782 | agt = zmalloc(sizeof(*agt)); | |
783 | if (!agt) { | |
784 | goto error; | |
785 | } | |
786 | agt->domain = domain; | |
787 | ||
788 | ret = agent_init(agt); | |
789 | if (ret < 0) { | |
790 | free(agt); | |
988ae332 | 791 | agt = NULL; |
fefd409b DG |
792 | goto error; |
793 | } | |
794 | ||
795 | error: | |
796 | return agt; | |
797 | } | |
798 | ||
0475c50c | 799 | /* |
0a3fca4d JG |
800 | * Create a newly allocated agent event data structure. |
801 | * Ownership of filter_expression is taken. | |
0475c50c DG |
802 | * |
803 | * Return a new object else NULL on error. | |
804 | */ | |
022d91ba | 805 | struct agent_event *agent_create_event(const char *name, |
15f57f85 | 806 | enum lttng_loglevel_type loglevel_type, int loglevel_value, |
0a3fca4d | 807 | struct lttng_filter_bytecode *filter, char *filter_expression) |
0475c50c | 808 | { |
0a3fca4d | 809 | struct agent_event *event = NULL; |
0475c50c | 810 | |
ade8d7e3 AM |
811 | DBG3("Agent create new event with name %s, loglevel type %d, \ |
812 | loglevel value %d and filter %s", | |
be8753bb JG |
813 | name, loglevel_type, loglevel_value, |
814 | filter_expression ? filter_expression : "NULL"); | |
0475c50c | 815 | |
0a3fca4d JG |
816 | if (!name) { |
817 | ERR("Failed to create agent event; no name provided."); | |
0475c50c DG |
818 | goto error; |
819 | } | |
820 | ||
0a3fca4d JG |
821 | event = zmalloc(sizeof(*event)); |
822 | if (!event) { | |
823 | goto error; | |
0475c50c DG |
824 | } |
825 | ||
0a3fca4d JG |
826 | strncpy(event->name, name, sizeof(event->name)); |
827 | event->name[sizeof(event->name) - 1] = '\0'; | |
828 | lttng_ht_node_init_str(&event->node, event->name); | |
be6a6276 | 829 | |
79a065a0 | 830 | event->loglevel_value = loglevel_value; |
0a3fca4d JG |
831 | event->loglevel_type = loglevel_type; |
832 | event->filter = filter; | |
833 | event->filter_expression = filter_expression; | |
0475c50c DG |
834 | error: |
835 | return event; | |
836 | } | |
837 | ||
838 | /* | |
022d91ba | 839 | * Unique add of a agent event to an agent object. |
0475c50c | 840 | */ |
022d91ba | 841 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c DG |
842 | { |
843 | assert(event); | |
022d91ba DG |
844 | assert(agt); |
845 | assert(agt->events); | |
0475c50c | 846 | |
022d91ba | 847 | DBG3("Agent adding event %s", event->name); |
0475c50c | 848 | |
f20baf8e | 849 | rcu_read_lock(); |
022d91ba | 850 | add_unique_agent_event(agt->events, event); |
f20baf8e | 851 | rcu_read_unlock(); |
022d91ba | 852 | agt->being_used = 1; |
0475c50c DG |
853 | } |
854 | ||
855 | /* | |
442a3c6e | 856 | * Find multiple agent events sharing the given name. |
4a4ab2c3 | 857 | * |
442a3c6e PP |
858 | * RCU read side lock MUST be acquired. It must be held for the |
859 | * duration of the iteration. | |
4a4ab2c3 | 860 | * |
442a3c6e | 861 | * Sets the given iterator. |
4a4ab2c3 | 862 | */ |
442a3c6e PP |
863 | void agent_find_events_by_name(const char *name, struct agent *agt, |
864 | struct lttng_ht_iter* iter) | |
4a4ab2c3 | 865 | { |
4a4ab2c3 | 866 | struct lttng_ht *ht; |
022d91ba | 867 | struct agent_ht_key key; |
4a4ab2c3 DG |
868 | |
869 | assert(name); | |
022d91ba DG |
870 | assert(agt); |
871 | assert(agt->events); | |
442a3c6e | 872 | assert(iter); |
4a4ab2c3 | 873 | |
022d91ba | 874 | ht = agt->events; |
4a4ab2c3 DG |
875 | key.name = name; |
876 | ||
877 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
442a3c6e PP |
878 | ht_match_event_by_name, &key, &iter->iter); |
879 | } | |
4a4ab2c3 | 880 | |
442a3c6e PP |
881 | /* |
882 | * Get the next agent event duplicate by name. This should be called | |
883 | * after a call to agent_find_events_by_name() to iterate on events. | |
884 | * | |
885 | * The RCU read lock must be held during the iteration and for as long | |
886 | * as the object the iterator points to remains in use. | |
887 | */ | |
888 | void agent_event_next_duplicate(const char *name, | |
889 | struct agent *agt, struct lttng_ht_iter* iter) | |
890 | { | |
891 | struct agent_ht_key key; | |
4a4ab2c3 | 892 | |
442a3c6e PP |
893 | key.name = name; |
894 | ||
895 | cds_lfht_next_duplicate(agt->events->ht, ht_match_event_by_name, | |
896 | &key, &iter->iter); | |
4a4ab2c3 DG |
897 | } |
898 | ||
899 | /* | |
ade8d7e3 | 900 | * Find a agent event in the given agent using name, loglevel and filter. |
0475c50c DG |
901 | * |
902 | * RCU read side lock MUST be acquired. | |
903 | * | |
904 | * Return object if found else NULL. | |
905 | */ | |
15f57f85 PP |
906 | struct agent_event *agent_find_event(const char *name, |
907 | enum lttng_loglevel_type loglevel_type, int loglevel_value, | |
ade8d7e3 | 908 | char *filter_expression, struct agent *agt) |
0475c50c DG |
909 | { |
910 | struct lttng_ht_node_str *node; | |
911 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 912 | struct lttng_ht *ht; |
022d91ba | 913 | struct agent_ht_key key; |
0475c50c DG |
914 | |
915 | assert(name); | |
022d91ba DG |
916 | assert(agt); |
917 | assert(agt->events); | |
0475c50c | 918 | |
022d91ba | 919 | ht = agt->events; |
4a4ab2c3 | 920 | key.name = name; |
79a065a0 | 921 | key.loglevel_value = loglevel_value; |
15f57f85 | 922 | key.loglevel_type = loglevel_type; |
ade8d7e3 | 923 | key.filter_expression = filter_expression; |
4a4ab2c3 DG |
924 | |
925 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
926 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
927 | node = lttng_ht_iter_get_node_str(&iter); |
928 | if (node == NULL) { | |
929 | goto error; | |
930 | } | |
931 | ||
022d91ba DG |
932 | DBG3("Agent event found %s.", name); |
933 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
934 | |
935 | error: | |
cc102a6e | 936 | DBG3("Agent event NOT found %s.", name); |
0475c50c DG |
937 | return NULL; |
938 | } | |
939 | ||
0475c50c | 940 | /* |
022d91ba DG |
941 | * Free given agent event. This event must not be globally visible at this |
942 | * point (only expected to be used on failure just after event creation). After | |
943 | * this call, the pointer is not usable anymore. | |
0475c50c | 944 | */ |
022d91ba | 945 | void agent_destroy_event(struct agent_event *event) |
0475c50c DG |
946 | { |
947 | assert(event); | |
948 | ||
971da06a | 949 | free(event->filter); |
d75bffee | 950 | free(event->filter_expression); |
0a3fca4d | 951 | free(event->exclusion); |
0475c50c DG |
952 | free(event); |
953 | } | |
954 | ||
955 | /* | |
9fe73c3c | 956 | * Destroy an agent completely. |
0475c50c | 957 | */ |
022d91ba | 958 | void agent_destroy(struct agent *agt) |
0475c50c DG |
959 | { |
960 | struct lttng_ht_node_str *node; | |
961 | struct lttng_ht_iter iter; | |
962 | ||
022d91ba | 963 | assert(agt); |
0475c50c | 964 | |
022d91ba | 965 | DBG3("Agent destroy"); |
0475c50c DG |
966 | |
967 | /* | |
968 | * Just ignore if no events hash table exists. This is possible if for | |
022d91ba | 969 | * instance an agent object was allocated but not initialized. |
0475c50c | 970 | */ |
022d91ba | 971 | if (!agt->events) { |
0475c50c DG |
972 | return; |
973 | } | |
974 | ||
975 | rcu_read_lock(); | |
022d91ba | 976 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 977 | int ret; |
022d91ba | 978 | struct agent_event *event; |
29c0fd4d DG |
979 | |
980 | /* | |
981 | * When destroying an event, we have to try to disable it on the agent | |
982 | * side so the event stops generating data. The return value is not | |
983 | * important since we have to continue anyway destroying the object. | |
984 | */ | |
022d91ba DG |
985 | event = caa_container_of(node, struct agent_event, node); |
986 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 987 | |
022d91ba | 988 | ret = lttng_ht_del(agt->events, &iter); |
0475c50c | 989 | assert(!ret); |
022d91ba | 990 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c DG |
991 | } |
992 | rcu_read_unlock(); | |
993 | ||
f8be902b | 994 | ht_cleanup_push(agt->events); |
9fe73c3c | 995 | free(agt); |
f20baf8e DG |
996 | } |
997 | ||
998 | /* | |
5642e70b | 999 | * Allocate agent_apps_ht_by_sock. |
f20baf8e | 1000 | */ |
5642e70b | 1001 | int agent_app_ht_alloc(void) |
f20baf8e | 1002 | { |
5642e70b JG |
1003 | int ret = 0; |
1004 | ||
022d91ba DG |
1005 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1006 | if (!agent_apps_ht_by_sock) { | |
5642e70b | 1007 | ret = -1; |
f20baf8e DG |
1008 | } |
1009 | ||
5642e70b JG |
1010 | return ret; |
1011 | } | |
1012 | ||
1013 | /* | |
1014 | * Destroy a agent application by socket. | |
1015 | */ | |
1016 | void agent_destroy_app_by_sock(int sock) | |
1017 | { | |
1018 | struct agent_app *app; | |
1019 | ||
1020 | assert(sock >= 0); | |
1021 | ||
1022 | /* | |
1023 | * Not finding an application is a very important error that should NEVER | |
1024 | * happen. The hash table deletion is ONLY done through this call when the | |
1025 | * main sessiond thread is torn down. | |
1026 | */ | |
1027 | rcu_read_lock(); | |
1028 | app = agent_find_app_by_sock(sock); | |
1029 | assert(app); | |
1030 | ||
1031 | /* RCU read side lock is assumed to be held by this function. */ | |
1032 | agent_delete_app(app); | |
1033 | ||
1034 | /* The application is freed in a RCU call but the socket is closed here. */ | |
1035 | agent_destroy_app(app); | |
1036 | rcu_read_unlock(); | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * Clean-up the agent app hash table and destroy it. | |
1041 | */ | |
1042 | void agent_app_ht_clean(void) | |
1043 | { | |
1044 | struct lttng_ht_node_ulong *node; | |
1045 | struct lttng_ht_iter iter; | |
1046 | ||
77cdfc81 JG |
1047 | if (!agent_apps_ht_by_sock) { |
1048 | return; | |
1049 | } | |
5642e70b JG |
1050 | rcu_read_lock(); |
1051 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) { | |
1052 | struct agent_app *app; | |
1053 | ||
1054 | app = caa_container_of(node, struct agent_app, node); | |
1055 | agent_destroy_app_by_sock(app->sock->fd); | |
1056 | } | |
1057 | rcu_read_unlock(); | |
1058 | ||
1059 | lttng_ht_destroy(agent_apps_ht_by_sock); | |
f20baf8e DG |
1060 | } |
1061 | ||
1062 | /* | |
022d91ba | 1063 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
1064 | * |
1065 | * Note that this function is most likely to be used with a tracing session | |
1066 | * thus the caller should make sure to hold the appropriate lock(s). | |
1067 | */ | |
022d91ba | 1068 | void agent_update(struct agent *agt, int sock) |
f20baf8e DG |
1069 | { |
1070 | int ret; | |
022d91ba DG |
1071 | struct agent_app *app; |
1072 | struct agent_event *event; | |
f20baf8e DG |
1073 | struct lttng_ht_iter iter; |
1074 | ||
022d91ba | 1075 | assert(agt); |
f20baf8e DG |
1076 | assert(sock >= 0); |
1077 | ||
022d91ba | 1078 | DBG("Agent updating app socket %d", sock); |
f20baf8e DG |
1079 | |
1080 | rcu_read_lock(); | |
022d91ba | 1081 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e DG |
1082 | /* Skip event if disabled. */ |
1083 | if (!event->enabled) { | |
1084 | continue; | |
1085 | } | |
1086 | ||
022d91ba | 1087 | app = agent_find_app_by_sock(sock); |
f20baf8e DG |
1088 | /* |
1089 | * We are in the registration path thus if the application is gone, | |
1090 | * there is a serious code flow error. | |
1091 | */ | |
1092 | assert(app); | |
1093 | ||
1094 | ret = enable_event(app, event); | |
1095 | if (ret != LTTNG_OK) { | |
022d91ba | 1096 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
1097 | event->name, app->pid, app->sock->fd); |
1098 | /* Let's try the others here and don't assume the app is dead. */ | |
1099 | continue; | |
1100 | } | |
1101 | } | |
1102 | rcu_read_unlock(); | |
0475c50c | 1103 | } |