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 | 30 | #include "utils.h" |
23c2bd47 JG |
31 | #include "error.h" |
32 | ||
33 | #define AGENT_RET_CODE_INDEX(code) (code - AGENT_RET_CODE_SUCCESS) | |
34 | ||
35 | /* | |
36 | * Human readable agent return code. | |
37 | */ | |
38 | static const char *error_string_array[] = { | |
39 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_SUCCESS) ] = "Success", | |
40 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_INVALID) ] = "Invalid command", | |
41 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_UNKNOWN_NAME) ] = "Unknown logger name", | |
42 | ||
43 | /* Last element */ | |
44 | [ AGENT_RET_CODE_INDEX(AGENT_RET_CODE_NR) ] = "Unknown code", | |
45 | }; | |
46 | ||
47 | static | |
48 | void log_reply_code(uint32_t in_reply_ret_code) | |
49 | { | |
50 | int level = PRINT_DBG3; | |
51 | /* | |
52 | * reply_ret_code and in_reply_ret_code are kept separate to have a | |
53 | * sanitized value (used to retrieve the human readable string) and the | |
54 | * original value which is logged as-is. | |
55 | */ | |
56 | uint32_t reply_ret_code = in_reply_ret_code; | |
57 | ||
58 | if (reply_ret_code < AGENT_RET_CODE_SUCCESS || | |
59 | reply_ret_code >= AGENT_RET_CODE_NR) { | |
60 | reply_ret_code = AGENT_RET_CODE_NR; | |
61 | level = PRINT_ERR; | |
62 | } | |
63 | ||
64 | LOG(level, "Agent replied with retcode: %s (%"PRIu32")", | |
65 | error_string_array[AGENT_RET_CODE_INDEX( | |
66 | reply_ret_code)], | |
67 | in_reply_ret_code); | |
68 | } | |
0475c50c | 69 | |
4a4ab2c3 DG |
70 | /* |
71 | * Match function for the events hash table lookup by name. | |
72 | */ | |
73 | static int ht_match_event_by_name(struct cds_lfht_node *node, | |
74 | const void *_key) | |
75 | { | |
022d91ba DG |
76 | struct agent_event *event; |
77 | const struct agent_ht_key *key; | |
4a4ab2c3 DG |
78 | |
79 | assert(node); | |
80 | assert(_key); | |
81 | ||
022d91ba | 82 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
83 | key = _key; |
84 | ||
85 | /* Match 1 elements of the key: name. */ | |
86 | ||
87 | /* Event name */ | |
88 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
89 | goto no_match; | |
90 | } | |
91 | /* Match. */ | |
92 | return 1; | |
93 | ||
94 | no_match: | |
95 | return 0; | |
96 | } | |
97 | ||
98 | /* | |
99 | * Match function for the events hash table lookup by name and loglevel. | |
100 | */ | |
101 | static int ht_match_event(struct cds_lfht_node *node, | |
102 | const void *_key) | |
103 | { | |
022d91ba DG |
104 | struct agent_event *event; |
105 | const struct agent_ht_key *key; | |
4a4ab2c3 DG |
106 | |
107 | assert(node); | |
108 | assert(_key); | |
109 | ||
022d91ba | 110 | event = caa_container_of(node, struct agent_event, node.node); |
4a4ab2c3 DG |
111 | key = _key; |
112 | ||
113 | /* Match 2 elements of the key: name and loglevel. */ | |
114 | ||
115 | /* Event name */ | |
116 | if (strncmp(event->name, key->name, sizeof(event->name)) != 0) { | |
117 | goto no_match; | |
118 | } | |
119 | ||
120 | if (event->loglevel != key->loglevel) { | |
121 | if (event->loglevel_type == LTTNG_EVENT_LOGLEVEL_ALL && | |
122 | key->loglevel == 0 && event->loglevel == -1) { | |
123 | goto match; | |
124 | } | |
125 | goto no_match; | |
126 | } | |
127 | match: | |
128 | return 1; | |
129 | ||
130 | no_match: | |
131 | return 0; | |
132 | } | |
133 | ||
134 | /* | |
022d91ba | 135 | * Add unique agent event based on the event name and loglevel. |
4a4ab2c3 | 136 | */ |
022d91ba DG |
137 | static void add_unique_agent_event(struct lttng_ht *ht, |
138 | struct agent_event *event) | |
4a4ab2c3 DG |
139 | { |
140 | struct cds_lfht_node *node_ptr; | |
022d91ba | 141 | struct agent_ht_key key; |
4a4ab2c3 DG |
142 | |
143 | assert(ht); | |
144 | assert(ht->ht); | |
145 | assert(event); | |
146 | ||
147 | key.name = event->name; | |
148 | key.loglevel = event->loglevel; | |
149 | ||
150 | node_ptr = cds_lfht_add_unique(ht->ht, | |
151 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
152 | ht_match_event, &key, &event->node.node); | |
153 | assert(node_ptr == &event->node.node); | |
154 | } | |
155 | ||
0475c50c | 156 | /* |
022d91ba | 157 | * URCU delayed agent event reclaim. |
0475c50c | 158 | */ |
022d91ba | 159 | static void destroy_event_agent_rcu(struct rcu_head *head) |
0475c50c DG |
160 | { |
161 | struct lttng_ht_node_str *node = | |
162 | caa_container_of(head, struct lttng_ht_node_str, head); | |
022d91ba DG |
163 | struct agent_event *event = |
164 | caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
165 | |
166 | free(event); | |
167 | } | |
168 | ||
f20baf8e | 169 | /* |
022d91ba | 170 | * URCU delayed agent app reclaim. |
f20baf8e | 171 | */ |
022d91ba | 172 | static void destroy_app_agent_rcu(struct rcu_head *head) |
f20baf8e DG |
173 | { |
174 | struct lttng_ht_node_ulong *node = | |
175 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
022d91ba DG |
176 | struct agent_app *app = |
177 | caa_container_of(node, struct agent_app, node); | |
f20baf8e DG |
178 | |
179 | free(app); | |
180 | } | |
181 | ||
182 | /* | |
022d91ba DG |
183 | * Communication with the agent. Send the message header to the given socket in |
184 | * big endian. | |
f20baf8e DG |
185 | * |
186 | * Return 0 on success or else a negative errno message of sendmsg() op. | |
187 | */ | |
188 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, | |
189 | uint32_t cmd, uint32_t cmd_version) | |
190 | { | |
191 | int ret; | |
192 | ssize_t size; | |
022d91ba | 193 | struct lttcomm_agent_hdr msg; |
f20baf8e DG |
194 | |
195 | assert(sock); | |
196 | ||
53efb85a | 197 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
198 | msg.data_size = htobe64(data_size); |
199 | msg.cmd = htobe32(cmd); | |
200 | msg.cmd_version = htobe32(cmd_version); | |
201 | ||
202 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
203 | if (size < sizeof(msg)) { | |
204 | ret = -errno; | |
205 | goto error; | |
206 | } | |
207 | ret = 0; | |
208 | ||
209 | error: | |
210 | return ret; | |
211 | } | |
212 | ||
213 | /* | |
022d91ba DG |
214 | * Communication call with the agent. Send the payload to the given socket. The |
215 | * header MUST be sent prior to this call. | |
f20baf8e DG |
216 | * |
217 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
218 | */ | |
219 | static int send_payload(struct lttcomm_sock *sock, void *data, | |
220 | size_t size) | |
221 | { | |
222 | int ret; | |
223 | ssize_t len; | |
224 | ||
225 | assert(sock); | |
226 | assert(data); | |
227 | ||
228 | len = sock->ops->sendmsg(sock, data, size, 0); | |
229 | if (len < size) { | |
230 | ret = -errno; | |
231 | goto error; | |
232 | } | |
233 | ret = 0; | |
234 | ||
235 | error: | |
236 | return ret; | |
237 | } | |
238 | ||
239 | /* | |
022d91ba DG |
240 | * Communication call with the agent. Receive reply from the agent using the |
241 | * given socket. | |
f20baf8e DG |
242 | * |
243 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
244 | */ | |
245 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
246 | { | |
247 | int ret; | |
248 | ssize_t len; | |
249 | ||
250 | assert(sock); | |
251 | assert(buf); | |
252 | ||
253 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
254 | if (len < size) { | |
255 | ret = -errno; | |
256 | goto error; | |
257 | } | |
258 | ret = 0; | |
259 | ||
260 | error: | |
261 | return ret; | |
262 | } | |
263 | ||
3c6a091f | 264 | /* |
428de77a | 265 | * Internal event listing for a given app. Populate events. |
3c6a091f DG |
266 | * |
267 | * Return number of element in the list or else a negative LTTNG_ERR* code. | |
428de77a MD |
268 | * On success, the caller is responsible for freeing the memory |
269 | * allocated for "events". | |
3c6a091f | 270 | */ |
022d91ba | 271 | static ssize_t list_events(struct agent_app *app, struct lttng_event **events) |
3c6a091f DG |
272 | { |
273 | int ret, i, len = 0, offset = 0; | |
274 | uint32_t nb_event; | |
275 | size_t data_size; | |
d84af1a4 | 276 | uint32_t reply_ret_code; |
3c6a091f | 277 | struct lttng_event *tmp_events = NULL; |
022d91ba DG |
278 | struct lttcomm_agent_list_reply *reply = NULL; |
279 | struct lttcomm_agent_list_reply_hdr reply_hdr; | |
3c6a091f DG |
280 | |
281 | assert(app); | |
282 | assert(app->sock); | |
283 | assert(events); | |
284 | ||
022d91ba | 285 | DBG2("Agent listing events for app pid: %d and socket %d", app->pid, |
3c6a091f DG |
286 | app->sock->fd); |
287 | ||
022d91ba | 288 | ret = send_header(app->sock, 0, AGENT_CMD_LIST, 0); |
3c6a091f DG |
289 | if (ret < 0) { |
290 | goto error_io; | |
291 | } | |
292 | ||
293 | /* Get list header so we know how much we'll receive. */ | |
294 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); | |
295 | if (ret < 0) { | |
296 | goto error_io; | |
297 | } | |
298 | ||
d84af1a4 JG |
299 | reply_ret_code = be32toh(reply_hdr.ret_code); |
300 | log_reply_code(reply_ret_code); | |
301 | switch (reply_ret_code) { | |
022d91ba | 302 | case AGENT_RET_CODE_SUCCESS: |
3c6a091f DG |
303 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
304 | break; | |
305 | default: | |
022d91ba | 306 | ERR("Agent returned an unknown code: %" PRIu32, |
3c6a091f DG |
307 | be32toh(reply_hdr.ret_code)); |
308 | ret = LTTNG_ERR_FATAL; | |
309 | goto error; | |
310 | } | |
311 | ||
312 | reply = zmalloc(data_size); | |
313 | if (!reply) { | |
314 | ret = LTTNG_ERR_NOMEM; | |
315 | goto error; | |
316 | } | |
317 | ||
318 | /* Get the list with the appropriate data size. */ | |
319 | ret = recv_reply(app->sock, reply, data_size); | |
320 | if (ret < 0) { | |
321 | goto error_io; | |
322 | } | |
323 | ||
324 | nb_event = be32toh(reply->nb_event); | |
325 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); | |
326 | if (!tmp_events) { | |
327 | ret = LTTNG_ERR_NOMEM; | |
328 | goto error; | |
329 | } | |
330 | ||
331 | for (i = 0; i < nb_event; i++) { | |
332 | offset += len; | |
333 | strncpy(tmp_events[i].name, reply->payload + offset, | |
334 | sizeof(tmp_events[i].name)); | |
335 | tmp_events[i].pid = app->pid; | |
336 | tmp_events[i].enabled = -1; | |
337 | len = strlen(reply->payload + offset) + 1; | |
338 | } | |
339 | ||
340 | *events = tmp_events; | |
341 | ||
342 | free(reply); | |
343 | return nb_event; | |
344 | ||
345 | error_io: | |
346 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
347 | error: | |
348 | free(reply); | |
349 | free(tmp_events); | |
350 | return -ret; | |
351 | ||
352 | } | |
353 | ||
f20baf8e | 354 | /* |
022d91ba DG |
355 | * Internal enable agent event on a agent application. This function |
356 | * communicates with the agent to enable a given event. | |
f20baf8e DG |
357 | * |
358 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
359 | */ | |
022d91ba | 360 | static int enable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
361 | { |
362 | int ret; | |
363 | uint64_t data_size; | |
f4f9d4db | 364 | uint32_t reply_ret_code; |
022d91ba DG |
365 | struct lttcomm_agent_enable msg; |
366 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
367 | |
368 | assert(app); | |
369 | assert(app->sock); | |
370 | assert(event); | |
371 | ||
022d91ba | 372 | DBG2("Agent enabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
373 | app->pid, app->sock->fd); |
374 | ||
375 | data_size = sizeof(msg); | |
376 | ||
022d91ba | 377 | ret = send_header(app->sock, data_size, AGENT_CMD_ENABLE, 0); |
f20baf8e DG |
378 | if (ret < 0) { |
379 | goto error_io; | |
380 | } | |
381 | ||
53efb85a | 382 | memset(&msg, 0, sizeof(msg)); |
b2064f54 DG |
383 | msg.loglevel = event->loglevel; |
384 | msg.loglevel_type = event->loglevel_type; | |
f20baf8e DG |
385 | strncpy(msg.name, event->name, sizeof(msg.name)); |
386 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
387 | if (ret < 0) { | |
388 | goto error_io; | |
389 | } | |
390 | ||
391 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
392 | if (ret < 0) { | |
393 | goto error_io; | |
394 | } | |
395 | ||
f4f9d4db JG |
396 | reply_ret_code = be32toh(reply.ret_code); |
397 | log_reply_code(reply_ret_code); | |
398 | switch (reply_ret_code) { | |
022d91ba | 399 | case AGENT_RET_CODE_SUCCESS: |
f20baf8e | 400 | break; |
022d91ba | 401 | case AGENT_RET_CODE_UNKNOWN_NAME: |
f20baf8e DG |
402 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
403 | goto error; | |
404 | default: | |
022d91ba | 405 | ERR("Agent returned an unknown code: %" PRIu32, |
f20baf8e DG |
406 | be32toh(reply.ret_code)); |
407 | ret = LTTNG_ERR_FATAL; | |
408 | goto error; | |
409 | } | |
410 | ||
411 | return LTTNG_OK; | |
412 | ||
413 | error_io: | |
414 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
415 | error: | |
416 | return ret; | |
417 | } | |
418 | ||
419 | /* | |
022d91ba DG |
420 | * Internal disable agent event call on a agent application. This function |
421 | * communicates with the agent to disable a given event. | |
f20baf8e DG |
422 | * |
423 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
424 | */ | |
022d91ba | 425 | static int disable_event(struct agent_app *app, struct agent_event *event) |
f20baf8e DG |
426 | { |
427 | int ret; | |
428 | uint64_t data_size; | |
022d91ba DG |
429 | struct lttcomm_agent_disable msg; |
430 | struct lttcomm_agent_generic_reply reply; | |
f20baf8e DG |
431 | |
432 | assert(app); | |
433 | assert(app->sock); | |
434 | assert(event); | |
435 | ||
022d91ba | 436 | DBG2("Agent disabling event %s for app pid: %d and socket %d", event->name, |
f20baf8e DG |
437 | app->pid, app->sock->fd); |
438 | ||
439 | data_size = sizeof(msg); | |
440 | ||
022d91ba | 441 | ret = send_header(app->sock, data_size, AGENT_CMD_DISABLE, 0); |
f20baf8e DG |
442 | if (ret < 0) { |
443 | goto error_io; | |
444 | } | |
445 | ||
53efb85a | 446 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
447 | strncpy(msg.name, event->name, sizeof(msg.name)); |
448 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
449 | if (ret < 0) { | |
450 | goto error_io; | |
451 | } | |
452 | ||
453 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
454 | if (ret < 0) { | |
455 | goto error_io; | |
456 | } | |
457 | ||
458 | switch (be32toh(reply.ret_code)) { | |
022d91ba DG |
459 | case AGENT_RET_CODE_SUCCESS: |
460 | break; | |
461 | case AGENT_RET_CODE_UNKNOWN_NAME: | |
462 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
463 | goto error; | |
464 | default: | |
465 | ERR("Agent returned an unknown code: %" PRIu32, | |
466 | be32toh(reply.ret_code)); | |
467 | ret = LTTNG_ERR_FATAL; | |
468 | goto error; | |
f20baf8e DG |
469 | } |
470 | ||
471 | return LTTNG_OK; | |
472 | ||
473 | error_io: | |
474 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
475 | error: | |
476 | return ret; | |
477 | } | |
478 | ||
1b500e7a | 479 | /* |
022d91ba | 480 | * Send back the registration DONE command to a given agent application. |
1b500e7a DG |
481 | * |
482 | * Return 0 on success or else a negative value. | |
483 | */ | |
022d91ba | 484 | int agent_send_registration_done(struct agent_app *app) |
1b500e7a DG |
485 | { |
486 | assert(app); | |
487 | assert(app->sock); | |
488 | ||
022d91ba | 489 | DBG("Agent sending registration done to app socket %d", app->sock->fd); |
1b500e7a | 490 | |
b26d1f5c | 491 | return send_header(app->sock, 0, AGENT_CMD_REG_DONE, 0); |
1b500e7a DG |
492 | } |
493 | ||
f20baf8e | 494 | /* |
022d91ba | 495 | * Enable agent event on every agent applications registered with the session |
f20baf8e DG |
496 | * daemon. |
497 | * | |
498 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
499 | */ | |
fefd409b DG |
500 | int agent_enable_event(struct agent_event *event, |
501 | enum lttng_domain_type domain) | |
f20baf8e DG |
502 | { |
503 | int ret; | |
022d91ba | 504 | struct agent_app *app; |
f20baf8e DG |
505 | struct lttng_ht_iter iter; |
506 | ||
507 | assert(event); | |
508 | ||
509 | rcu_read_lock(); | |
510 | ||
022d91ba | 511 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 512 | node.node) { |
fefd409b DG |
513 | if (app->domain != domain) { |
514 | continue; | |
515 | } | |
516 | ||
022d91ba | 517 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
518 | ret = enable_event(app, event); |
519 | if (ret != LTTNG_OK) { | |
520 | goto error; | |
521 | } | |
f20baf8e DG |
522 | } |
523 | ||
3c6a091f | 524 | event->enabled = 1; |
f20baf8e DG |
525 | ret = LTTNG_OK; |
526 | ||
527 | error: | |
528 | rcu_read_unlock(); | |
529 | return ret; | |
530 | } | |
531 | ||
532 | /* | |
022d91ba | 533 | * Disable agent event on every agent applications registered with the session |
f20baf8e DG |
534 | * daemon. |
535 | * | |
536 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
537 | */ | |
fefd409b DG |
538 | int agent_disable_event(struct agent_event *event, |
539 | enum lttng_domain_type domain) | |
f20baf8e | 540 | { |
f1bc0129 | 541 | int ret = LTTNG_OK; |
022d91ba | 542 | struct agent_app *app; |
f20baf8e DG |
543 | struct lttng_ht_iter iter; |
544 | ||
545 | assert(event); | |
f1bc0129 JG |
546 | if (!event->enabled) { |
547 | goto end; | |
548 | } | |
f20baf8e DG |
549 | |
550 | rcu_read_lock(); | |
551 | ||
022d91ba | 552 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e | 553 | node.node) { |
fefd409b DG |
554 | if (app->domain != domain) { |
555 | continue; | |
556 | } | |
557 | ||
022d91ba | 558 | /* Enable event on agent application through TCP socket. */ |
f20baf8e DG |
559 | ret = disable_event(app, event); |
560 | if (ret != LTTNG_OK) { | |
561 | goto error; | |
562 | } | |
f20baf8e DG |
563 | } |
564 | ||
3c6a091f | 565 | event->enabled = 0; |
f20baf8e DG |
566 | |
567 | error: | |
568 | rcu_read_unlock(); | |
f1bc0129 | 569 | end: |
f20baf8e DG |
570 | return ret; |
571 | } | |
572 | ||
573 | /* | |
022d91ba DG |
574 | * Ask every agent for the list of possible event. Events is allocated with the |
575 | * events of every agent application. | |
f20baf8e DG |
576 | * |
577 | * Return the number of events or else a negative value. | |
578 | */ | |
f60140a1 DG |
579 | int agent_list_events(struct lttng_event **events, |
580 | enum lttng_domain_type domain) | |
f20baf8e DG |
581 | { |
582 | int ret; | |
583 | size_t nbmem, count = 0; | |
022d91ba | 584 | struct agent_app *app; |
aae6255e | 585 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
586 | struct lttng_ht_iter iter; |
587 | ||
588 | assert(events); | |
589 | ||
0e115563 DG |
590 | DBG2("Agent listing events for domain %d", domain); |
591 | ||
f20baf8e DG |
592 | nbmem = UST_APP_EVENT_LIST_SIZE; |
593 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
594 | if (!tmp_events) { | |
022d91ba | 595 | PERROR("zmalloc agent list events"); |
f20baf8e DG |
596 | ret = -ENOMEM; |
597 | goto error; | |
598 | } | |
599 | ||
600 | rcu_read_lock(); | |
022d91ba | 601 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, app, |
f20baf8e DG |
602 | node.node) { |
603 | ssize_t nb_ev; | |
022d91ba | 604 | struct lttng_event *agent_events; |
f20baf8e | 605 | |
f60140a1 DG |
606 | /* Skip domain not asked by the list. */ |
607 | if (app->domain != domain) { | |
608 | continue; | |
609 | } | |
610 | ||
022d91ba | 611 | nb_ev = list_events(app, &agent_events); |
f20baf8e DG |
612 | if (nb_ev < 0) { |
613 | ret = nb_ev; | |
428de77a | 614 | goto error_unlock; |
f20baf8e DG |
615 | } |
616 | ||
53efb85a | 617 | if (count + nb_ev > nbmem) { |
f20baf8e | 618 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
619 | struct lttng_event *new_tmp_events; |
620 | size_t new_nbmem; | |
621 | ||
622 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
022d91ba | 623 | DBG2("Reallocating agent event list from %zu to %zu entries", |
53efb85a MD |
624 | nbmem, new_nbmem); |
625 | new_tmp_events = realloc(tmp_events, | |
626 | new_nbmem * sizeof(*new_tmp_events)); | |
627 | if (!new_tmp_events) { | |
022d91ba | 628 | PERROR("realloc agent events"); |
f20baf8e | 629 | ret = -ENOMEM; |
022d91ba | 630 | free(agent_events); |
428de77a | 631 | goto error_unlock; |
f20baf8e | 632 | } |
53efb85a MD |
633 | /* Zero the new memory */ |
634 | memset(new_tmp_events + nbmem, 0, | |
635 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
636 | nbmem = new_nbmem; | |
637 | tmp_events = new_tmp_events; | |
f20baf8e | 638 | } |
022d91ba | 639 | memcpy(tmp_events + count, agent_events, |
53efb85a | 640 | nb_ev * sizeof(*tmp_events)); |
022d91ba | 641 | free(agent_events); |
f20baf8e DG |
642 | count += nb_ev; |
643 | } | |
644 | rcu_read_unlock(); | |
645 | ||
646 | ret = count; | |
647 | *events = tmp_events; | |
aae6255e | 648 | return ret; |
f20baf8e | 649 | |
428de77a MD |
650 | error_unlock: |
651 | rcu_read_unlock(); | |
f20baf8e | 652 | error: |
aae6255e | 653 | free(tmp_events); |
f20baf8e DG |
654 | return ret; |
655 | } | |
656 | ||
657 | /* | |
022d91ba | 658 | * Create a agent app object using the given PID. |
f20baf8e DG |
659 | * |
660 | * Return newly allocated object or else NULL on error. | |
661 | */ | |
fefd409b DG |
662 | struct agent_app *agent_create_app(pid_t pid, enum lttng_domain_type domain, |
663 | struct lttcomm_sock *sock) | |
f20baf8e | 664 | { |
022d91ba | 665 | struct agent_app *app; |
f20baf8e DG |
666 | |
667 | assert(sock); | |
668 | ||
669 | app = zmalloc(sizeof(*app)); | |
670 | if (!app) { | |
022d91ba | 671 | PERROR("zmalloc agent create"); |
f20baf8e DG |
672 | goto error; |
673 | } | |
674 | ||
675 | app->pid = pid; | |
fefd409b | 676 | app->domain = domain; |
f20baf8e | 677 | app->sock = sock; |
f20baf8e DG |
678 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
679 | ||
680 | error: | |
681 | return app; | |
682 | } | |
683 | ||
684 | /* | |
022d91ba | 685 | * Lookup agent app by socket in the global hash table. |
f20baf8e DG |
686 | * |
687 | * RCU read side lock MUST be acquired. | |
688 | * | |
689 | * Return object if found else NULL. | |
690 | */ | |
022d91ba | 691 | struct agent_app *agent_find_app_by_sock(int sock) |
f20baf8e DG |
692 | { |
693 | struct lttng_ht_node_ulong *node; | |
694 | struct lttng_ht_iter iter; | |
022d91ba | 695 | struct agent_app *app; |
f20baf8e DG |
696 | |
697 | assert(sock >= 0); | |
698 | ||
022d91ba | 699 | lttng_ht_lookup(agent_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
f20baf8e DG |
700 | node = lttng_ht_iter_get_node_ulong(&iter); |
701 | if (node == NULL) { | |
702 | goto error; | |
703 | } | |
022d91ba | 704 | app = caa_container_of(node, struct agent_app, node); |
f20baf8e | 705 | |
022d91ba | 706 | DBG3("Agent app pid %d found by sock %d.", app->pid, sock); |
f20baf8e DG |
707 | return app; |
708 | ||
709 | error: | |
022d91ba | 710 | DBG3("Agent app NOT found by sock %d.", sock); |
f20baf8e DG |
711 | return NULL; |
712 | } | |
713 | ||
714 | /* | |
022d91ba | 715 | * Add agent application object to the global hash table. |
f20baf8e | 716 | */ |
022d91ba | 717 | void agent_add_app(struct agent_app *app) |
f20baf8e DG |
718 | { |
719 | assert(app); | |
720 | ||
022d91ba | 721 | DBG3("Agent adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
f20baf8e DG |
722 | |
723 | rcu_read_lock(); | |
022d91ba | 724 | lttng_ht_add_unique_ulong(agent_apps_ht_by_sock, &app->node); |
f20baf8e DG |
725 | rcu_read_unlock(); |
726 | } | |
727 | ||
f20baf8e | 728 | /* |
022d91ba | 729 | * Delete agent application from the global hash table. |
d558f236 JG |
730 | * |
731 | * rcu_read_lock() must be held by the caller. | |
f20baf8e | 732 | */ |
022d91ba | 733 | void agent_delete_app(struct agent_app *app) |
f20baf8e DG |
734 | { |
735 | int ret; | |
736 | struct lttng_ht_iter iter; | |
737 | ||
738 | assert(app); | |
739 | ||
022d91ba | 740 | DBG3("Agent deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
f20baf8e DG |
741 | |
742 | iter.iter.node = &app->node.node; | |
022d91ba | 743 | ret = lttng_ht_del(agent_apps_ht_by_sock, &iter); |
f20baf8e DG |
744 | assert(!ret); |
745 | } | |
746 | ||
747 | /* | |
e785906c | 748 | * Destroy an agent application object by detaching it from its corresponding |
022d91ba | 749 | * UST app if one is connected by closing the socket. Finally, perform a |
428de77a | 750 | * delayed memory reclaim. |
f20baf8e | 751 | */ |
022d91ba | 752 | void agent_destroy_app(struct agent_app *app) |
f20baf8e DG |
753 | { |
754 | assert(app); | |
755 | ||
756 | if (app->sock) { | |
757 | app->sock->ops->close(app->sock); | |
758 | lttcomm_destroy_sock(app->sock); | |
759 | } | |
760 | ||
022d91ba | 761 | call_rcu(&app->node.head, destroy_app_agent_rcu); |
f20baf8e DG |
762 | } |
763 | ||
0475c50c | 764 | /* |
022d91ba | 765 | * Initialize an already allocated agent object. |
0475c50c DG |
766 | * |
767 | * Return 0 on success or else a negative errno value. | |
768 | */ | |
022d91ba | 769 | int agent_init(struct agent *agt) |
0475c50c DG |
770 | { |
771 | int ret; | |
772 | ||
022d91ba | 773 | assert(agt); |
0475c50c | 774 | |
022d91ba DG |
775 | agt->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
776 | if (!agt->events) { | |
0475c50c DG |
777 | ret = -ENOMEM; |
778 | goto error; | |
779 | } | |
fefd409b | 780 | lttng_ht_node_init_u64(&agt->node, agt->domain); |
0475c50c DG |
781 | |
782 | return 0; | |
783 | ||
784 | error: | |
785 | return ret; | |
786 | } | |
787 | ||
fefd409b DG |
788 | /* |
789 | * Add agent object to the given hash table. | |
790 | */ | |
791 | void agent_add(struct agent *agt, struct lttng_ht *ht) | |
792 | { | |
793 | assert(agt); | |
794 | assert(ht); | |
795 | ||
796 | DBG3("Agent adding from domain %d", agt->domain); | |
797 | ||
798 | rcu_read_lock(); | |
799 | lttng_ht_add_unique_u64(ht, &agt->node); | |
800 | rcu_read_unlock(); | |
801 | } | |
802 | ||
803 | /* | |
804 | * Create an agent object for the given domain. | |
805 | * | |
806 | * Return the allocated agent or NULL on error. | |
807 | */ | |
808 | struct agent *agent_create(enum lttng_domain_type domain) | |
809 | { | |
810 | int ret; | |
811 | struct agent *agt; | |
812 | ||
813 | agt = zmalloc(sizeof(*agt)); | |
814 | if (!agt) { | |
815 | goto error; | |
816 | } | |
817 | agt->domain = domain; | |
818 | ||
819 | ret = agent_init(agt); | |
820 | if (ret < 0) { | |
821 | free(agt); | |
988ae332 | 822 | agt = NULL; |
fefd409b DG |
823 | goto error; |
824 | } | |
825 | ||
826 | error: | |
827 | return agt; | |
828 | } | |
829 | ||
0475c50c | 830 | /* |
022d91ba | 831 | * Create a newly allocated agent event data structure. If name is valid, it's |
0475c50c DG |
832 | * copied into the created event. |
833 | * | |
834 | * Return a new object else NULL on error. | |
835 | */ | |
022d91ba | 836 | struct agent_event *agent_create_event(const char *name, |
be6a6276 | 837 | struct lttng_filter_bytecode *filter) |
0475c50c | 838 | { |
022d91ba | 839 | struct agent_event *event; |
0475c50c | 840 | |
022d91ba | 841 | DBG3("Agent create new event with name %s", name); |
0475c50c DG |
842 | |
843 | event = zmalloc(sizeof(*event)); | |
844 | if (!event) { | |
845 | goto error; | |
846 | } | |
847 | ||
848 | if (name) { | |
849 | strncpy(event->name, name, sizeof(event->name)); | |
850 | event->name[sizeof(event->name) - 1] = '\0'; | |
f20baf8e | 851 | lttng_ht_node_init_str(&event->node, event->name); |
0475c50c DG |
852 | } |
853 | ||
be6a6276 DG |
854 | if (filter) { |
855 | event->filter = filter; | |
856 | } | |
857 | ||
0475c50c DG |
858 | error: |
859 | return event; | |
860 | } | |
861 | ||
862 | /* | |
022d91ba | 863 | * Unique add of a agent event to an agent object. |
0475c50c | 864 | */ |
022d91ba | 865 | void agent_add_event(struct agent_event *event, struct agent *agt) |
0475c50c DG |
866 | { |
867 | assert(event); | |
022d91ba DG |
868 | assert(agt); |
869 | assert(agt->events); | |
0475c50c | 870 | |
022d91ba | 871 | DBG3("Agent adding event %s", event->name); |
0475c50c | 872 | |
f20baf8e | 873 | rcu_read_lock(); |
022d91ba | 874 | add_unique_agent_event(agt->events, event); |
f20baf8e | 875 | rcu_read_unlock(); |
022d91ba | 876 | agt->being_used = 1; |
0475c50c DG |
877 | } |
878 | ||
879 | /* | |
022d91ba | 880 | * Find a agent event in the given agent using name. |
4a4ab2c3 DG |
881 | * |
882 | * RCU read side lock MUST be acquired. | |
883 | * | |
884 | * Return object if found else NULL. | |
885 | */ | |
022d91ba DG |
886 | struct agent_event *agent_find_event_by_name(const char *name, |
887 | struct agent *agt) | |
4a4ab2c3 DG |
888 | { |
889 | struct lttng_ht_node_str *node; | |
890 | struct lttng_ht_iter iter; | |
891 | struct lttng_ht *ht; | |
022d91ba | 892 | struct agent_ht_key key; |
4a4ab2c3 DG |
893 | |
894 | assert(name); | |
022d91ba DG |
895 | assert(agt); |
896 | assert(agt->events); | |
4a4ab2c3 | 897 | |
022d91ba | 898 | ht = agt->events; |
4a4ab2c3 DG |
899 | key.name = name; |
900 | ||
901 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
902 | ht_match_event_by_name, &key, &iter.iter); | |
903 | node = lttng_ht_iter_get_node_str(&iter); | |
904 | if (node == NULL) { | |
905 | goto error; | |
906 | } | |
907 | ||
022d91ba DG |
908 | DBG3("Agent event found %s by name.", name); |
909 | return caa_container_of(node, struct agent_event, node); | |
4a4ab2c3 DG |
910 | |
911 | error: | |
022d91ba | 912 | DBG3("Agent NOT found by name %s.", name); |
4a4ab2c3 DG |
913 | return NULL; |
914 | } | |
915 | ||
916 | /* | |
022d91ba | 917 | * Find a agent event in the given agent using name and loglevel. |
0475c50c DG |
918 | * |
919 | * RCU read side lock MUST be acquired. | |
920 | * | |
921 | * Return object if found else NULL. | |
922 | */ | |
022d91ba DG |
923 | struct agent_event *agent_find_event(const char *name, int loglevel, |
924 | struct agent *agt) | |
0475c50c DG |
925 | { |
926 | struct lttng_ht_node_str *node; | |
927 | struct lttng_ht_iter iter; | |
4a4ab2c3 | 928 | struct lttng_ht *ht; |
022d91ba | 929 | struct agent_ht_key key; |
0475c50c DG |
930 | |
931 | assert(name); | |
022d91ba DG |
932 | assert(agt); |
933 | assert(agt->events); | |
0475c50c | 934 | |
022d91ba | 935 | ht = agt->events; |
4a4ab2c3 DG |
936 | key.name = name; |
937 | key.loglevel = loglevel; | |
938 | ||
939 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
940 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
941 | node = lttng_ht_iter_get_node_str(&iter); |
942 | if (node == NULL) { | |
943 | goto error; | |
944 | } | |
945 | ||
022d91ba DG |
946 | DBG3("Agent event found %s.", name); |
947 | return caa_container_of(node, struct agent_event, node); | |
0475c50c DG |
948 | |
949 | error: | |
a51e817b | 950 | DBG3("Agent event NOT found %s.", name); |
0475c50c DG |
951 | return NULL; |
952 | } | |
953 | ||
0475c50c | 954 | /* |
022d91ba DG |
955 | * Free given agent event. This event must not be globally visible at this |
956 | * point (only expected to be used on failure just after event creation). After | |
957 | * this call, the pointer is not usable anymore. | |
0475c50c | 958 | */ |
022d91ba | 959 | void agent_destroy_event(struct agent_event *event) |
0475c50c DG |
960 | { |
961 | assert(event); | |
962 | ||
971da06a | 963 | free(event->filter); |
0475c50c DG |
964 | free(event); |
965 | } | |
966 | ||
967 | /* | |
022d91ba | 968 | * Destroy an agent completely. Note that the given pointer is NOT freed |
428de77a | 969 | * thus a reference to static or stack data can be passed to this function. |
0475c50c | 970 | */ |
022d91ba | 971 | void agent_destroy(struct agent *agt) |
0475c50c DG |
972 | { |
973 | struct lttng_ht_node_str *node; | |
974 | struct lttng_ht_iter iter; | |
975 | ||
022d91ba | 976 | assert(agt); |
0475c50c | 977 | |
022d91ba | 978 | DBG3("Agent destroy"); |
0475c50c DG |
979 | |
980 | /* | |
981 | * Just ignore if no events hash table exists. This is possible if for | |
022d91ba | 982 | * instance an agent object was allocated but not initialized. |
0475c50c | 983 | */ |
022d91ba | 984 | if (!agt->events) { |
0475c50c DG |
985 | return; |
986 | } | |
987 | ||
988 | rcu_read_lock(); | |
022d91ba | 989 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, node, node) { |
0475c50c | 990 | int ret; |
022d91ba | 991 | struct agent_event *event; |
29c0fd4d DG |
992 | |
993 | /* | |
994 | * When destroying an event, we have to try to disable it on the agent | |
995 | * side so the event stops generating data. The return value is not | |
996 | * important since we have to continue anyway destroying the object. | |
997 | */ | |
022d91ba DG |
998 | event = caa_container_of(node, struct agent_event, node); |
999 | (void) agent_disable_event(event, agt->domain); | |
0475c50c | 1000 | |
022d91ba | 1001 | ret = lttng_ht_del(agt->events, &iter); |
0475c50c | 1002 | assert(!ret); |
022d91ba | 1003 | call_rcu(&node->head, destroy_event_agent_rcu); |
0475c50c DG |
1004 | } |
1005 | rcu_read_unlock(); | |
1006 | ||
f8be902b | 1007 | ht_cleanup_push(agt->events); |
f20baf8e DG |
1008 | } |
1009 | ||
1010 | /* | |
6a4e4039 | 1011 | * Allocate agent_apps_ht_by_sock. |
f20baf8e | 1012 | */ |
6a4e4039 | 1013 | int agent_app_ht_alloc(void) |
f20baf8e | 1014 | { |
6a4e4039 JG |
1015 | int ret = 0; |
1016 | ||
022d91ba DG |
1017 | agent_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1018 | if (!agent_apps_ht_by_sock) { | |
6a4e4039 | 1019 | ret = -1; |
f20baf8e DG |
1020 | } |
1021 | ||
6a4e4039 JG |
1022 | return ret; |
1023 | } | |
1024 | ||
1025 | /* | |
1026 | * Destroy a agent application by socket. | |
1027 | */ | |
1028 | void agent_destroy_app_by_sock(int sock) | |
1029 | { | |
1030 | struct agent_app *app; | |
1031 | ||
1032 | assert(sock >= 0); | |
1033 | ||
1034 | /* | |
1035 | * Not finding an application is a very important error that should NEVER | |
1036 | * happen. The hash table deletion is ONLY done through this call when the | |
1037 | * main sessiond thread is torn down. | |
1038 | */ | |
1039 | rcu_read_lock(); | |
1040 | app = agent_find_app_by_sock(sock); | |
1041 | assert(app); | |
1042 | ||
1043 | /* RCU read side lock is assumed to be held by this function. */ | |
1044 | agent_delete_app(app); | |
1045 | ||
1046 | /* The application is freed in a RCU call but the socket is closed here. */ | |
1047 | agent_destroy_app(app); | |
1048 | rcu_read_unlock(); | |
1049 | } | |
1050 | ||
1051 | /* | |
1052 | * Clean-up the agent app hash table and destroy it. | |
1053 | */ | |
1054 | void agent_app_ht_clean(void) | |
1055 | { | |
1056 | struct lttng_ht_node_ulong *node; | |
1057 | struct lttng_ht_iter iter; | |
1058 | ||
a433283e JG |
1059 | if (!agent_apps_ht_by_sock) { |
1060 | return; | |
1061 | } | |
6a4e4039 JG |
1062 | rcu_read_lock(); |
1063 | cds_lfht_for_each_entry(agent_apps_ht_by_sock->ht, &iter.iter, node, node) { | |
1064 | struct agent_app *app; | |
1065 | ||
1066 | app = caa_container_of(node, struct agent_app, node); | |
1067 | agent_destroy_app_by_sock(app->sock->fd); | |
1068 | } | |
1069 | rcu_read_unlock(); | |
1070 | ||
1071 | lttng_ht_destroy(agent_apps_ht_by_sock); | |
f20baf8e DG |
1072 | } |
1073 | ||
1074 | /* | |
022d91ba | 1075 | * Update a agent application (given socket) using the given agent. |
f20baf8e DG |
1076 | * |
1077 | * Note that this function is most likely to be used with a tracing session | |
1078 | * thus the caller should make sure to hold the appropriate lock(s). | |
1079 | */ | |
022d91ba | 1080 | void agent_update(struct agent *agt, int sock) |
f20baf8e DG |
1081 | { |
1082 | int ret; | |
022d91ba DG |
1083 | struct agent_app *app; |
1084 | struct agent_event *event; | |
f20baf8e DG |
1085 | struct lttng_ht_iter iter; |
1086 | ||
022d91ba | 1087 | assert(agt); |
f20baf8e DG |
1088 | assert(sock >= 0); |
1089 | ||
022d91ba | 1090 | DBG("Agent updating app socket %d", sock); |
f20baf8e DG |
1091 | |
1092 | rcu_read_lock(); | |
022d91ba | 1093 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) { |
f20baf8e DG |
1094 | /* Skip event if disabled. */ |
1095 | if (!event->enabled) { | |
1096 | continue; | |
1097 | } | |
1098 | ||
022d91ba | 1099 | app = agent_find_app_by_sock(sock); |
f20baf8e DG |
1100 | /* |
1101 | * We are in the registration path thus if the application is gone, | |
1102 | * there is a serious code flow error. | |
1103 | */ | |
1104 | assert(app); | |
1105 | ||
1106 | ret = enable_event(app, event); | |
1107 | if (ret != LTTNG_OK) { | |
022d91ba | 1108 | DBG2("Agent update unable to enable event %s on app pid: %d sock %d", |
f20baf8e DG |
1109 | event->name, app->pid, app->sock->fd); |
1110 | /* Let's try the others here and don't assume the app is dead. */ | |
1111 | continue; | |
1112 | } | |
1113 | } | |
1114 | rcu_read_unlock(); | |
0475c50c | 1115 | } |