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> | |
f20baf8e | 23 | #include <common/sessiond-comm/jul.h> |
0475c50c | 24 | |
f263b7fd JD |
25 | #include <common/compat/endian.h> |
26 | ||
0475c50c | 27 | #include "jul.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 | { | |
37 | struct jul_event *event; | |
38 | const struct jul_ht_key *key; | |
39 | ||
40 | assert(node); | |
41 | assert(_key); | |
42 | ||
43 | event = caa_container_of(node, struct jul_event, node.node); | |
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 | { | |
65 | struct jul_event *event; | |
66 | const struct jul_ht_key *key; | |
67 | ||
68 | assert(node); | |
69 | assert(_key); | |
70 | ||
71 | event = caa_container_of(node, struct jul_event, node.node); | |
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 | /* | |
96 | * Add unique JUL event based on the event name and loglevel. | |
97 | */ | |
98 | static void add_unique_jul_event(struct lttng_ht *ht, struct jul_event *event) | |
99 | { | |
100 | struct cds_lfht_node *node_ptr; | |
101 | struct jul_ht_key key; | |
102 | ||
103 | assert(ht); | |
104 | assert(ht->ht); | |
105 | assert(event); | |
106 | ||
107 | key.name = event->name; | |
108 | key.loglevel = event->loglevel; | |
109 | ||
110 | node_ptr = cds_lfht_add_unique(ht->ht, | |
111 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
112 | ht_match_event, &key, &event->node.node); | |
113 | assert(node_ptr == &event->node.node); | |
114 | } | |
115 | ||
0475c50c | 116 | /* |
428de77a | 117 | * URCU delayed JUL event reclaim. |
0475c50c DG |
118 | */ |
119 | static void destroy_event_jul_rcu(struct rcu_head *head) | |
120 | { | |
121 | struct lttng_ht_node_str *node = | |
122 | caa_container_of(head, struct lttng_ht_node_str, head); | |
123 | struct jul_event *event = | |
124 | caa_container_of(node, struct jul_event, node); | |
125 | ||
126 | free(event); | |
127 | } | |
128 | ||
f20baf8e | 129 | /* |
428de77a | 130 | * URCU delayed JUL app reclaim. |
f20baf8e DG |
131 | */ |
132 | static void destroy_app_jul_rcu(struct rcu_head *head) | |
133 | { | |
134 | struct lttng_ht_node_ulong *node = | |
135 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
136 | struct jul_app *app = | |
137 | caa_container_of(node, struct jul_app, node); | |
138 | ||
139 | free(app); | |
140 | } | |
141 | ||
142 | /* | |
428de77a MD |
143 | * Communication with Java agent. Send the message header to the given |
144 | * socket in big endian. | |
f20baf8e DG |
145 | * |
146 | * Return 0 on success or else a negative errno message of sendmsg() op. | |
147 | */ | |
148 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, | |
149 | uint32_t cmd, uint32_t cmd_version) | |
150 | { | |
151 | int ret; | |
152 | ssize_t size; | |
153 | struct lttcomm_jul_hdr msg; | |
154 | ||
155 | assert(sock); | |
156 | ||
53efb85a | 157 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
158 | msg.data_size = htobe64(data_size); |
159 | msg.cmd = htobe32(cmd); | |
160 | msg.cmd_version = htobe32(cmd_version); | |
161 | ||
162 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
163 | if (size < sizeof(msg)) { | |
164 | ret = -errno; | |
165 | goto error; | |
166 | } | |
167 | ret = 0; | |
168 | ||
169 | error: | |
170 | return ret; | |
171 | } | |
172 | ||
173 | /* | |
174 | * Communication call with the Java agent. Send the payload to the given | |
175 | * socket. The header MUST be sent prior to this call. | |
176 | * | |
177 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
178 | */ | |
179 | static int send_payload(struct lttcomm_sock *sock, void *data, | |
180 | size_t size) | |
181 | { | |
182 | int ret; | |
183 | ssize_t len; | |
184 | ||
185 | assert(sock); | |
186 | assert(data); | |
187 | ||
188 | len = sock->ops->sendmsg(sock, data, size, 0); | |
189 | if (len < size) { | |
190 | ret = -errno; | |
191 | goto error; | |
192 | } | |
193 | ret = 0; | |
194 | ||
195 | error: | |
196 | return ret; | |
197 | } | |
198 | ||
199 | /* | |
200 | * Communication call with the Java agent. Receive reply from the agent using | |
201 | * the given socket. | |
202 | * | |
203 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
204 | */ | |
205 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
206 | { | |
207 | int ret; | |
208 | ssize_t len; | |
209 | ||
210 | assert(sock); | |
211 | assert(buf); | |
212 | ||
213 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
214 | if (len < size) { | |
215 | ret = -errno; | |
216 | goto error; | |
217 | } | |
218 | ret = 0; | |
219 | ||
220 | error: | |
221 | return ret; | |
222 | } | |
223 | ||
3c6a091f DG |
224 | |
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 DG |
231 | */ |
232 | static ssize_t list_events(struct jul_app *app, struct lttng_event **events) | |
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; | |
238 | struct lttcomm_jul_list_reply *reply = NULL; | |
239 | struct lttcomm_jul_list_reply_hdr reply_hdr; | |
240 | ||
241 | assert(app); | |
242 | assert(app->sock); | |
243 | assert(events); | |
244 | ||
245 | DBG2("JUL listing events for app pid: %d and socket %d", app->pid, | |
246 | app->sock->fd); | |
247 | ||
248 | ret = send_header(app->sock, 0, JUL_CMD_LIST, 0); | |
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)) { | |
260 | case JUL_RET_CODE_SUCCESS: | |
261 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); | |
262 | break; | |
263 | default: | |
264 | ERR("Java agent returned an unknown code: %" PRIu32, | |
265 | be32toh(reply_hdr.ret_code)); | |
266 | ret = LTTNG_ERR_FATAL; | |
267 | goto error; | |
268 | } | |
269 | ||
270 | reply = zmalloc(data_size); | |
271 | if (!reply) { | |
272 | ret = LTTNG_ERR_NOMEM; | |
273 | goto error; | |
274 | } | |
275 | ||
276 | /* Get the list with the appropriate data size. */ | |
277 | ret = recv_reply(app->sock, reply, data_size); | |
278 | if (ret < 0) { | |
279 | goto error_io; | |
280 | } | |
281 | ||
282 | nb_event = be32toh(reply->nb_event); | |
283 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); | |
284 | if (!tmp_events) { | |
285 | ret = LTTNG_ERR_NOMEM; | |
286 | goto error; | |
287 | } | |
288 | ||
289 | for (i = 0; i < nb_event; i++) { | |
290 | offset += len; | |
291 | strncpy(tmp_events[i].name, reply->payload + offset, | |
292 | sizeof(tmp_events[i].name)); | |
293 | tmp_events[i].pid = app->pid; | |
294 | tmp_events[i].enabled = -1; | |
295 | len = strlen(reply->payload + offset) + 1; | |
296 | } | |
297 | ||
298 | *events = tmp_events; | |
299 | ||
300 | free(reply); | |
301 | return nb_event; | |
302 | ||
303 | error_io: | |
304 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
305 | error: | |
306 | free(reply); | |
307 | free(tmp_events); | |
308 | return -ret; | |
309 | ||
310 | } | |
311 | ||
f20baf8e | 312 | /* |
428de77a | 313 | * Internal enable JUL event on a JUL application. This function |
f20baf8e DG |
314 | * communicates with the Java agent to enable a given event (Logger name). |
315 | * | |
316 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
317 | */ | |
318 | static int enable_event(struct jul_app *app, struct jul_event *event) | |
319 | { | |
320 | int ret; | |
321 | uint64_t data_size; | |
322 | struct lttcomm_jul_enable msg; | |
323 | struct lttcomm_jul_generic_reply reply; | |
324 | ||
325 | assert(app); | |
326 | assert(app->sock); | |
327 | assert(event); | |
328 | ||
329 | DBG2("JUL enabling event %s for app pid: %d and socket %d", event->name, | |
330 | app->pid, app->sock->fd); | |
331 | ||
332 | data_size = sizeof(msg); | |
333 | ||
334 | ret = send_header(app->sock, data_size, JUL_CMD_ENABLE, 0); | |
335 | if (ret < 0) { | |
336 | goto error_io; | |
337 | } | |
338 | ||
53efb85a | 339 | memset(&msg, 0, sizeof(msg)); |
b2064f54 DG |
340 | msg.loglevel = event->loglevel; |
341 | msg.loglevel_type = event->loglevel_type; | |
f20baf8e DG |
342 | strncpy(msg.name, event->name, sizeof(msg.name)); |
343 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
344 | if (ret < 0) { | |
345 | goto error_io; | |
346 | } | |
347 | ||
348 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
349 | if (ret < 0) { | |
350 | goto error_io; | |
351 | } | |
352 | ||
353 | switch (be32toh(reply.ret_code)) { | |
354 | case JUL_RET_CODE_SUCCESS: | |
355 | break; | |
356 | case JUL_RET_CODE_UNKNOWN_NAME: | |
357 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
358 | goto error; | |
359 | default: | |
360 | ERR("Java agent returned an unknown code: %" PRIu32, | |
361 | be32toh(reply.ret_code)); | |
362 | ret = LTTNG_ERR_FATAL; | |
363 | goto error; | |
364 | } | |
365 | ||
366 | return LTTNG_OK; | |
367 | ||
368 | error_io: | |
369 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
370 | error: | |
371 | return ret; | |
372 | } | |
373 | ||
374 | /* | |
375 | * Internal disable JUL event call on a JUL application. This function | |
376 | * communicates with the Java agent to disable a given event (Logger name). | |
377 | * | |
378 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
379 | */ | |
380 | static int disable_event(struct jul_app *app, struct jul_event *event) | |
381 | { | |
382 | int ret; | |
383 | uint64_t data_size; | |
384 | struct lttcomm_jul_disable msg; | |
385 | struct lttcomm_jul_generic_reply reply; | |
386 | ||
387 | assert(app); | |
388 | assert(app->sock); | |
389 | assert(event); | |
390 | ||
391 | DBG2("JUL disabling event %s for app pid: %d and socket %d", event->name, | |
392 | app->pid, app->sock->fd); | |
393 | ||
394 | data_size = sizeof(msg); | |
395 | ||
396 | ret = send_header(app->sock, data_size, JUL_CMD_DISABLE, 0); | |
397 | if (ret < 0) { | |
398 | goto error_io; | |
399 | } | |
400 | ||
53efb85a | 401 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
402 | strncpy(msg.name, event->name, sizeof(msg.name)); |
403 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
404 | if (ret < 0) { | |
405 | goto error_io; | |
406 | } | |
407 | ||
408 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
409 | if (ret < 0) { | |
410 | goto error_io; | |
411 | } | |
412 | ||
413 | switch (be32toh(reply.ret_code)) { | |
414 | case JUL_RET_CODE_SUCCESS: | |
415 | break; | |
416 | case JUL_RET_CODE_UNKNOWN_NAME: | |
417 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
418 | goto error; | |
419 | default: | |
420 | ERR("Java agent returned an unknown code: %" PRIu32, | |
421 | be32toh(reply.ret_code)); | |
422 | ret = LTTNG_ERR_FATAL; | |
423 | goto error; | |
424 | } | |
425 | ||
426 | return LTTNG_OK; | |
427 | ||
428 | error_io: | |
429 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
430 | error: | |
431 | return ret; | |
432 | } | |
433 | ||
1b500e7a DG |
434 | /* |
435 | * Send back the registration DONE command to a given JUL application. | |
436 | * | |
437 | * Return 0 on success or else a negative value. | |
438 | */ | |
439 | int jul_send_registration_done(struct jul_app *app) | |
440 | { | |
441 | assert(app); | |
442 | assert(app->sock); | |
443 | ||
444 | DBG("JUL sending registration done to app socket %d", app->sock->fd); | |
445 | ||
446 | return send_header(app->sock, 0, JUL_CMD_REG_DONE, 0); | |
447 | } | |
448 | ||
f20baf8e DG |
449 | /* |
450 | * Enable JUL event on every JUL applications registered with the session | |
451 | * daemon. | |
452 | * | |
453 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
454 | */ | |
455 | int jul_enable_event(struct jul_event *event) | |
456 | { | |
457 | int ret; | |
458 | struct jul_app *app; | |
459 | struct lttng_ht_iter iter; | |
460 | ||
461 | assert(event); | |
462 | ||
463 | rcu_read_lock(); | |
464 | ||
465 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, | |
466 | node.node) { | |
467 | /* Enable event on JUL application through TCP socket. */ | |
468 | ret = enable_event(app, event); | |
469 | if (ret != LTTNG_OK) { | |
470 | goto error; | |
471 | } | |
f20baf8e DG |
472 | } |
473 | ||
3c6a091f | 474 | event->enabled = 1; |
f20baf8e DG |
475 | ret = LTTNG_OK; |
476 | ||
477 | error: | |
478 | rcu_read_unlock(); | |
479 | return ret; | |
480 | } | |
481 | ||
482 | /* | |
483 | * Disable JUL event on every JUL applications registered with the session | |
484 | * daemon. | |
485 | * | |
486 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
487 | */ | |
488 | int jul_disable_event(struct jul_event *event) | |
489 | { | |
490 | int ret; | |
491 | struct jul_app *app; | |
492 | struct lttng_ht_iter iter; | |
493 | ||
494 | assert(event); | |
495 | ||
496 | rcu_read_lock(); | |
497 | ||
498 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, | |
499 | node.node) { | |
500 | /* Enable event on JUL application through TCP socket. */ | |
501 | ret = disable_event(app, event); | |
502 | if (ret != LTTNG_OK) { | |
503 | goto error; | |
504 | } | |
f20baf8e DG |
505 | } |
506 | ||
3c6a091f | 507 | event->enabled = 0; |
f20baf8e DG |
508 | ret = LTTNG_OK; |
509 | ||
510 | error: | |
511 | rcu_read_unlock(); | |
512 | return ret; | |
513 | } | |
514 | ||
515 | /* | |
516 | * Ask every java agent for the list of possible event (logger name). Events is | |
517 | * allocated with the events of every JUL application. | |
518 | * | |
519 | * Return the number of events or else a negative value. | |
520 | */ | |
521 | int jul_list_events(struct lttng_event **events) | |
522 | { | |
523 | int ret; | |
524 | size_t nbmem, count = 0; | |
525 | struct jul_app *app; | |
aae6255e | 526 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
527 | struct lttng_ht_iter iter; |
528 | ||
529 | assert(events); | |
530 | ||
531 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
532 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
533 | if (!tmp_events) { | |
534 | PERROR("zmalloc jul list events"); | |
535 | ret = -ENOMEM; | |
536 | goto error; | |
537 | } | |
538 | ||
539 | rcu_read_lock(); | |
540 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, | |
541 | node.node) { | |
542 | ssize_t nb_ev; | |
543 | struct lttng_event *jul_events; | |
544 | ||
545 | nb_ev = list_events(app, &jul_events); | |
546 | if (nb_ev < 0) { | |
547 | ret = nb_ev; | |
428de77a | 548 | goto error_unlock; |
f20baf8e DG |
549 | } |
550 | ||
53efb85a | 551 | if (count + nb_ev > nbmem) { |
f20baf8e | 552 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
553 | struct lttng_event *new_tmp_events; |
554 | size_t new_nbmem; | |
555 | ||
556 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
557 | DBG2("Reallocating JUL event list from %zu to %zu entries", | |
558 | nbmem, new_nbmem); | |
559 | new_tmp_events = realloc(tmp_events, | |
560 | new_nbmem * sizeof(*new_tmp_events)); | |
561 | if (!new_tmp_events) { | |
f20baf8e | 562 | PERROR("realloc JUL events"); |
f20baf8e | 563 | ret = -ENOMEM; |
c36441a9 | 564 | free(jul_events); |
428de77a | 565 | goto error_unlock; |
f20baf8e | 566 | } |
53efb85a MD |
567 | /* Zero the new memory */ |
568 | memset(new_tmp_events + nbmem, 0, | |
569 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
570 | nbmem = new_nbmem; | |
571 | tmp_events = new_tmp_events; | |
f20baf8e | 572 | } |
53efb85a MD |
573 | memcpy(tmp_events + count, jul_events, |
574 | nb_ev * sizeof(*tmp_events)); | |
f20baf8e DG |
575 | free(jul_events); |
576 | count += nb_ev; | |
577 | } | |
578 | rcu_read_unlock(); | |
579 | ||
580 | ret = count; | |
581 | *events = tmp_events; | |
aae6255e | 582 | return ret; |
f20baf8e | 583 | |
428de77a MD |
584 | error_unlock: |
585 | rcu_read_unlock(); | |
f20baf8e | 586 | error: |
aae6255e | 587 | free(tmp_events); |
f20baf8e DG |
588 | return ret; |
589 | } | |
590 | ||
591 | /* | |
592 | * Create a JUL app object using the given PID. | |
593 | * | |
594 | * Return newly allocated object or else NULL on error. | |
595 | */ | |
596 | struct jul_app *jul_create_app(pid_t pid, struct lttcomm_sock *sock) | |
597 | { | |
598 | struct jul_app *app; | |
599 | ||
600 | assert(sock); | |
601 | ||
602 | app = zmalloc(sizeof(*app)); | |
603 | if (!app) { | |
604 | PERROR("zmalloc JUL create"); | |
605 | goto error; | |
606 | } | |
607 | ||
608 | app->pid = pid; | |
609 | app->sock = sock; | |
f20baf8e DG |
610 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
611 | ||
612 | error: | |
613 | return app; | |
614 | } | |
615 | ||
616 | /* | |
617 | * Lookup JUL app by socket in the global hash table. | |
618 | * | |
619 | * RCU read side lock MUST be acquired. | |
620 | * | |
621 | * Return object if found else NULL. | |
622 | */ | |
623 | struct jul_app *jul_find_app_by_sock(int sock) | |
624 | { | |
625 | struct lttng_ht_node_ulong *node; | |
626 | struct lttng_ht_iter iter; | |
627 | struct jul_app *app; | |
628 | ||
629 | assert(sock >= 0); | |
630 | ||
631 | lttng_ht_lookup(jul_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); | |
632 | node = lttng_ht_iter_get_node_ulong(&iter); | |
633 | if (node == NULL) { | |
634 | goto error; | |
635 | } | |
636 | app = caa_container_of(node, struct jul_app, node); | |
637 | ||
638 | DBG3("JUL app pid %d found by sock %d.", app->pid, sock); | |
639 | return app; | |
640 | ||
641 | error: | |
642 | DBG3("JUL app NOT found by sock %d.", sock); | |
643 | return NULL; | |
644 | } | |
645 | ||
646 | /* | |
647 | * Add JUL application object to a given hash table. | |
648 | */ | |
649 | void jul_add_app(struct jul_app *app) | |
650 | { | |
651 | assert(app); | |
652 | ||
653 | DBG3("JUL adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); | |
654 | ||
655 | rcu_read_lock(); | |
656 | lttng_ht_add_unique_ulong(jul_apps_ht_by_sock, &app->node); | |
657 | rcu_read_unlock(); | |
658 | } | |
659 | ||
f20baf8e DG |
660 | /* |
661 | * Delete JUL application from the global hash table. | |
662 | */ | |
663 | void jul_delete_app(struct jul_app *app) | |
664 | { | |
665 | int ret; | |
666 | struct lttng_ht_iter iter; | |
667 | ||
668 | assert(app); | |
669 | ||
670 | DBG3("JUL deleting app pid: %d and sock: %d", app->pid, app->sock->fd); | |
671 | ||
672 | iter.iter.node = &app->node.node; | |
673 | rcu_read_lock(); | |
674 | ret = lttng_ht_del(jul_apps_ht_by_sock, &iter); | |
675 | rcu_read_unlock(); | |
676 | assert(!ret); | |
677 | } | |
678 | ||
679 | /* | |
680 | * Destroy a JUL application object by detaching it from its corresponding UST | |
428de77a MD |
681 | * app if one is connected by closing the socket. Finally, perform a |
682 | * delayed memory reclaim. | |
f20baf8e DG |
683 | */ |
684 | void jul_destroy_app(struct jul_app *app) | |
685 | { | |
686 | assert(app); | |
687 | ||
688 | if (app->sock) { | |
689 | app->sock->ops->close(app->sock); | |
690 | lttcomm_destroy_sock(app->sock); | |
691 | } | |
692 | ||
693 | call_rcu(&app->node.head, destroy_app_jul_rcu); | |
694 | } | |
695 | ||
0475c50c DG |
696 | /* |
697 | * Initialize an already allocated JUL domain object. | |
698 | * | |
699 | * Return 0 on success or else a negative errno value. | |
700 | */ | |
701 | int jul_init_domain(struct jul_domain *dom) | |
702 | { | |
703 | int ret; | |
704 | ||
705 | assert(dom); | |
706 | ||
707 | dom->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
708 | if (!dom->events) { | |
709 | ret = -ENOMEM; | |
710 | goto error; | |
711 | } | |
712 | ||
713 | return 0; | |
714 | ||
715 | error: | |
716 | return ret; | |
717 | } | |
718 | ||
719 | /* | |
720 | * Create a newly allocated JUL event data structure. If name is valid, it's | |
721 | * copied into the created event. | |
722 | * | |
723 | * Return a new object else NULL on error. | |
724 | */ | |
be6a6276 DG |
725 | struct jul_event *jul_create_event(const char *name, |
726 | struct lttng_filter_bytecode *filter) | |
0475c50c DG |
727 | { |
728 | struct jul_event *event; | |
729 | ||
730 | DBG3("JUL create new event with name %s", name); | |
731 | ||
732 | event = zmalloc(sizeof(*event)); | |
733 | if (!event) { | |
734 | goto error; | |
735 | } | |
736 | ||
737 | if (name) { | |
738 | strncpy(event->name, name, sizeof(event->name)); | |
739 | event->name[sizeof(event->name) - 1] = '\0'; | |
f20baf8e | 740 | lttng_ht_node_init_str(&event->node, event->name); |
0475c50c DG |
741 | } |
742 | ||
be6a6276 DG |
743 | if (filter) { |
744 | event->filter = filter; | |
745 | } | |
746 | ||
0475c50c DG |
747 | error: |
748 | return event; | |
749 | } | |
750 | ||
751 | /* | |
752 | * Unique add of a JUL event to a given domain. | |
753 | */ | |
754 | void jul_add_event(struct jul_event *event, struct jul_domain *dom) | |
755 | { | |
756 | assert(event); | |
757 | assert(dom); | |
758 | assert(dom->events); | |
759 | ||
760 | DBG3("JUL adding event %s to domain", event->name); | |
761 | ||
f20baf8e | 762 | rcu_read_lock(); |
4a4ab2c3 | 763 | add_unique_jul_event(dom->events, event); |
f20baf8e | 764 | rcu_read_unlock(); |
3c6a091f | 765 | dom->being_used = 1; |
0475c50c DG |
766 | } |
767 | ||
768 | /* | |
4a4ab2c3 DG |
769 | * Find a JUL event in the given domain using name and loglevel. |
770 | * | |
771 | * RCU read side lock MUST be acquired. | |
772 | * | |
773 | * Return object if found else NULL. | |
774 | */ | |
775 | struct jul_event *jul_find_event_by_name(const char *name, | |
776 | struct jul_domain *dom) | |
777 | { | |
778 | struct lttng_ht_node_str *node; | |
779 | struct lttng_ht_iter iter; | |
780 | struct lttng_ht *ht; | |
781 | struct jul_ht_key key; | |
782 | ||
783 | assert(name); | |
784 | assert(dom); | |
785 | assert(dom->events); | |
786 | ||
787 | ht = dom->events; | |
788 | key.name = name; | |
789 | ||
790 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
791 | ht_match_event_by_name, &key, &iter.iter); | |
792 | node = lttng_ht_iter_get_node_str(&iter); | |
793 | if (node == NULL) { | |
794 | goto error; | |
795 | } | |
796 | ||
797 | DBG3("JUL event found %s by name.", name); | |
798 | return caa_container_of(node, struct jul_event, node); | |
799 | ||
800 | error: | |
801 | DBG3("JUL NOT found by name %s.", name); | |
802 | return NULL; | |
803 | } | |
804 | ||
805 | /* | |
806 | * Find a JUL event in the given domain using name and loglevel. | |
0475c50c DG |
807 | * |
808 | * RCU read side lock MUST be acquired. | |
809 | * | |
810 | * Return object if found else NULL. | |
811 | */ | |
4a4ab2c3 DG |
812 | struct jul_event *jul_find_event(const char *name, |
813 | enum lttng_loglevel_jul loglevel, struct jul_domain *dom) | |
0475c50c DG |
814 | { |
815 | struct lttng_ht_node_str *node; | |
816 | struct lttng_ht_iter iter; | |
4a4ab2c3 DG |
817 | struct lttng_ht *ht; |
818 | struct jul_ht_key key; | |
0475c50c DG |
819 | |
820 | assert(name); | |
821 | assert(dom); | |
822 | assert(dom->events); | |
823 | ||
4a4ab2c3 DG |
824 | ht = dom->events; |
825 | key.name = name; | |
826 | key.loglevel = loglevel; | |
827 | ||
828 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
829 | ht_match_event, &key, &iter.iter); | |
0475c50c DG |
830 | node = lttng_ht_iter_get_node_str(&iter); |
831 | if (node == NULL) { | |
832 | goto error; | |
833 | } | |
834 | ||
4a4ab2c3 | 835 | DBG3("JUL event found %s.", name); |
0475c50c DG |
836 | return caa_container_of(node, struct jul_event, node); |
837 | ||
838 | error: | |
4a4ab2c3 | 839 | DBG3("JUL NOT found %s.", name); |
0475c50c DG |
840 | return NULL; |
841 | } | |
842 | ||
0475c50c | 843 | /* |
428de77a MD |
844 | * Free given JUL event. This event must not be globally visible at this |
845 | * point (only expected to be used on failure just after event | |
846 | * creation). After this call, the pointer is not usable anymore. | |
0475c50c DG |
847 | */ |
848 | void jul_destroy_event(struct jul_event *event) | |
849 | { | |
850 | assert(event); | |
851 | ||
852 | free(event); | |
853 | } | |
854 | ||
855 | /* | |
856 | * Destroy a JUL domain completely. Note that the given pointer is NOT freed | |
428de77a | 857 | * thus a reference to static or stack data can be passed to this function. |
0475c50c DG |
858 | */ |
859 | void jul_destroy_domain(struct jul_domain *dom) | |
860 | { | |
861 | struct lttng_ht_node_str *node; | |
862 | struct lttng_ht_iter iter; | |
863 | ||
864 | assert(dom); | |
865 | ||
866 | DBG3("JUL destroy domain"); | |
867 | ||
868 | /* | |
869 | * Just ignore if no events hash table exists. This is possible if for | |
870 | * instance a JUL domain object was allocated but not initialized. | |
871 | */ | |
872 | if (!dom->events) { | |
873 | return; | |
874 | } | |
875 | ||
876 | rcu_read_lock(); | |
877 | cds_lfht_for_each_entry(dom->events->ht, &iter.iter, node, node) { | |
878 | int ret; | |
879 | ||
880 | ret = lttng_ht_del(dom->events, &iter); | |
881 | assert(!ret); | |
882 | call_rcu(&node->head, destroy_event_jul_rcu); | |
883 | } | |
884 | rcu_read_unlock(); | |
885 | ||
f20baf8e DG |
886 | lttng_ht_destroy(dom->events); |
887 | } | |
888 | ||
889 | /* | |
890 | * Initialize JUL subsystem. | |
891 | */ | |
892 | int jul_init(void) | |
893 | { | |
894 | jul_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
895 | if (!jul_apps_ht_by_sock) { | |
896 | return -1; | |
897 | } | |
898 | ||
899 | return 0; | |
900 | } | |
901 | ||
902 | /* | |
903 | * Update a JUL application (given socket) using the given domain. | |
904 | * | |
905 | * Note that this function is most likely to be used with a tracing session | |
906 | * thus the caller should make sure to hold the appropriate lock(s). | |
907 | */ | |
908 | void jul_update(struct jul_domain *domain, int sock) | |
909 | { | |
910 | int ret; | |
911 | struct jul_app *app; | |
912 | struct jul_event *event; | |
913 | struct lttng_ht_iter iter; | |
914 | ||
915 | assert(domain); | |
916 | assert(sock >= 0); | |
917 | ||
918 | DBG("JUL updating app socket %d", sock); | |
919 | ||
920 | rcu_read_lock(); | |
921 | cds_lfht_for_each_entry(domain->events->ht, &iter.iter, event, node.node) { | |
922 | /* Skip event if disabled. */ | |
923 | if (!event->enabled) { | |
924 | continue; | |
925 | } | |
926 | ||
927 | app = jul_find_app_by_sock(sock); | |
928 | /* | |
929 | * We are in the registration path thus if the application is gone, | |
930 | * there is a serious code flow error. | |
931 | */ | |
932 | assert(app); | |
933 | ||
934 | ret = enable_event(app, event); | |
935 | if (ret != LTTNG_OK) { | |
936 | DBG2("JUL update unable to enable event %s on app pid: %d sock %d", | |
937 | event->name, app->pid, app->sock->fd); | |
938 | /* Let's try the others here and don't assume the app is dead. */ | |
939 | continue; | |
940 | } | |
941 | } | |
942 | rcu_read_unlock(); | |
0475c50c | 943 | } |