Commit | Line | Data |
---|---|---|
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 DG |
24 | |
25 | #include "jul.h" | |
f20baf8e | 26 | #include "ust-app.h" |
0475c50c DG |
27 | #include "utils.h" |
28 | ||
29 | /* | |
428de77a | 30 | * URCU delayed JUL event reclaim. |
0475c50c DG |
31 | */ |
32 | static void destroy_event_jul_rcu(struct rcu_head *head) | |
33 | { | |
34 | struct lttng_ht_node_str *node = | |
35 | caa_container_of(head, struct lttng_ht_node_str, head); | |
36 | struct jul_event *event = | |
37 | caa_container_of(node, struct jul_event, node); | |
38 | ||
39 | free(event); | |
40 | } | |
41 | ||
f20baf8e | 42 | /* |
428de77a | 43 | * URCU delayed JUL app reclaim. |
f20baf8e DG |
44 | */ |
45 | static void destroy_app_jul_rcu(struct rcu_head *head) | |
46 | { | |
47 | struct lttng_ht_node_ulong *node = | |
48 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
49 | struct jul_app *app = | |
50 | caa_container_of(node, struct jul_app, node); | |
51 | ||
52 | free(app); | |
53 | } | |
54 | ||
55 | /* | |
428de77a MD |
56 | * Communication with Java agent. Send the message header to the given |
57 | * socket in big endian. | |
f20baf8e DG |
58 | * |
59 | * Return 0 on success or else a negative errno message of sendmsg() op. | |
60 | */ | |
61 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, | |
62 | uint32_t cmd, uint32_t cmd_version) | |
63 | { | |
64 | int ret; | |
65 | ssize_t size; | |
66 | struct lttcomm_jul_hdr msg; | |
67 | ||
68 | assert(sock); | |
69 | ||
53efb85a | 70 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
71 | msg.data_size = htobe64(data_size); |
72 | msg.cmd = htobe32(cmd); | |
73 | msg.cmd_version = htobe32(cmd_version); | |
74 | ||
75 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
76 | if (size < sizeof(msg)) { | |
77 | ret = -errno; | |
78 | goto error; | |
79 | } | |
80 | ret = 0; | |
81 | ||
82 | error: | |
83 | return ret; | |
84 | } | |
85 | ||
86 | /* | |
87 | * Communication call with the Java agent. Send the payload to the given | |
88 | * socket. The header MUST be sent prior to this call. | |
89 | * | |
90 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
91 | */ | |
92 | static int send_payload(struct lttcomm_sock *sock, void *data, | |
93 | size_t size) | |
94 | { | |
95 | int ret; | |
96 | ssize_t len; | |
97 | ||
98 | assert(sock); | |
99 | assert(data); | |
100 | ||
101 | len = sock->ops->sendmsg(sock, data, size, 0); | |
102 | if (len < size) { | |
103 | ret = -errno; | |
104 | goto error; | |
105 | } | |
106 | ret = 0; | |
107 | ||
108 | error: | |
109 | return ret; | |
110 | } | |
111 | ||
112 | /* | |
113 | * Communication call with the Java agent. Receive reply from the agent using | |
114 | * the given socket. | |
115 | * | |
116 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
117 | */ | |
118 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
119 | { | |
120 | int ret; | |
121 | ssize_t len; | |
122 | ||
123 | assert(sock); | |
124 | assert(buf); | |
125 | ||
126 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
127 | if (len < size) { | |
128 | ret = -errno; | |
129 | goto error; | |
130 | } | |
131 | ret = 0; | |
132 | ||
133 | error: | |
134 | return ret; | |
135 | } | |
136 | ||
3c6a091f DG |
137 | |
138 | /* | |
428de77a | 139 | * Internal event listing for a given app. Populate events. |
3c6a091f DG |
140 | * |
141 | * Return number of element in the list or else a negative LTTNG_ERR* code. | |
428de77a MD |
142 | * On success, the caller is responsible for freeing the memory |
143 | * allocated for "events". | |
3c6a091f DG |
144 | */ |
145 | static ssize_t list_events(struct jul_app *app, struct lttng_event **events) | |
146 | { | |
147 | int ret, i, len = 0, offset = 0; | |
148 | uint32_t nb_event; | |
149 | size_t data_size; | |
150 | struct lttng_event *tmp_events = NULL; | |
151 | struct lttcomm_jul_list_reply *reply = NULL; | |
152 | struct lttcomm_jul_list_reply_hdr reply_hdr; | |
153 | ||
154 | assert(app); | |
155 | assert(app->sock); | |
156 | assert(events); | |
157 | ||
158 | DBG2("JUL listing events for app pid: %d and socket %d", app->pid, | |
159 | app->sock->fd); | |
160 | ||
161 | ret = send_header(app->sock, 0, JUL_CMD_LIST, 0); | |
162 | if (ret < 0) { | |
163 | goto error_io; | |
164 | } | |
165 | ||
166 | /* Get list header so we know how much we'll receive. */ | |
167 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); | |
168 | if (ret < 0) { | |
169 | goto error_io; | |
170 | } | |
171 | ||
172 | switch (be32toh(reply_hdr.ret_code)) { | |
173 | case JUL_RET_CODE_SUCCESS: | |
174 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); | |
175 | break; | |
176 | default: | |
177 | ERR("Java agent returned an unknown code: %" PRIu32, | |
178 | be32toh(reply_hdr.ret_code)); | |
179 | ret = LTTNG_ERR_FATAL; | |
180 | goto error; | |
181 | } | |
182 | ||
183 | reply = zmalloc(data_size); | |
184 | if (!reply) { | |
185 | ret = LTTNG_ERR_NOMEM; | |
186 | goto error; | |
187 | } | |
188 | ||
189 | /* Get the list with the appropriate data size. */ | |
190 | ret = recv_reply(app->sock, reply, data_size); | |
191 | if (ret < 0) { | |
192 | goto error_io; | |
193 | } | |
194 | ||
195 | nb_event = be32toh(reply->nb_event); | |
196 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); | |
197 | if (!tmp_events) { | |
198 | ret = LTTNG_ERR_NOMEM; | |
199 | goto error; | |
200 | } | |
201 | ||
202 | for (i = 0; i < nb_event; i++) { | |
203 | offset += len; | |
204 | strncpy(tmp_events[i].name, reply->payload + offset, | |
205 | sizeof(tmp_events[i].name)); | |
206 | tmp_events[i].pid = app->pid; | |
207 | tmp_events[i].enabled = -1; | |
208 | len = strlen(reply->payload + offset) + 1; | |
209 | } | |
210 | ||
211 | *events = tmp_events; | |
212 | ||
213 | free(reply); | |
214 | return nb_event; | |
215 | ||
216 | error_io: | |
217 | ret = LTTNG_ERR_UST_LIST_FAIL; | |
218 | error: | |
219 | free(reply); | |
220 | free(tmp_events); | |
221 | return -ret; | |
222 | ||
223 | } | |
224 | ||
f20baf8e | 225 | /* |
428de77a | 226 | * Internal enable JUL event on a JUL application. This function |
f20baf8e DG |
227 | * communicates with the Java agent to enable a given event (Logger name). |
228 | * | |
229 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
230 | */ | |
231 | static int enable_event(struct jul_app *app, struct jul_event *event) | |
232 | { | |
233 | int ret; | |
234 | uint64_t data_size; | |
235 | struct lttcomm_jul_enable msg; | |
236 | struct lttcomm_jul_generic_reply reply; | |
237 | ||
238 | assert(app); | |
239 | assert(app->sock); | |
240 | assert(event); | |
241 | ||
242 | DBG2("JUL enabling event %s for app pid: %d and socket %d", event->name, | |
243 | app->pid, app->sock->fd); | |
244 | ||
245 | data_size = sizeof(msg); | |
246 | ||
247 | ret = send_header(app->sock, data_size, JUL_CMD_ENABLE, 0); | |
248 | if (ret < 0) { | |
249 | goto error_io; | |
250 | } | |
251 | ||
53efb85a | 252 | memset(&msg, 0, sizeof(msg)); |
b2064f54 DG |
253 | msg.loglevel = event->loglevel; |
254 | msg.loglevel_type = event->loglevel_type; | |
f20baf8e DG |
255 | strncpy(msg.name, event->name, sizeof(msg.name)); |
256 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
257 | if (ret < 0) { | |
258 | goto error_io; | |
259 | } | |
260 | ||
261 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
262 | if (ret < 0) { | |
263 | goto error_io; | |
264 | } | |
265 | ||
266 | switch (be32toh(reply.ret_code)) { | |
267 | case JUL_RET_CODE_SUCCESS: | |
268 | break; | |
269 | case JUL_RET_CODE_UNKNOWN_NAME: | |
270 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
271 | goto error; | |
272 | default: | |
273 | ERR("Java agent returned an unknown code: %" PRIu32, | |
274 | be32toh(reply.ret_code)); | |
275 | ret = LTTNG_ERR_FATAL; | |
276 | goto error; | |
277 | } | |
278 | ||
279 | return LTTNG_OK; | |
280 | ||
281 | error_io: | |
282 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
283 | error: | |
284 | return ret; | |
285 | } | |
286 | ||
287 | /* | |
288 | * Internal disable JUL event call on a JUL application. This function | |
289 | * communicates with the Java agent to disable a given event (Logger name). | |
290 | * | |
291 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
292 | */ | |
293 | static int disable_event(struct jul_app *app, struct jul_event *event) | |
294 | { | |
295 | int ret; | |
296 | uint64_t data_size; | |
297 | struct lttcomm_jul_disable msg; | |
298 | struct lttcomm_jul_generic_reply reply; | |
299 | ||
300 | assert(app); | |
301 | assert(app->sock); | |
302 | assert(event); | |
303 | ||
304 | DBG2("JUL disabling event %s for app pid: %d and socket %d", event->name, | |
305 | app->pid, app->sock->fd); | |
306 | ||
307 | data_size = sizeof(msg); | |
308 | ||
309 | ret = send_header(app->sock, data_size, JUL_CMD_DISABLE, 0); | |
310 | if (ret < 0) { | |
311 | goto error_io; | |
312 | } | |
313 | ||
53efb85a | 314 | memset(&msg, 0, sizeof(msg)); |
f20baf8e DG |
315 | strncpy(msg.name, event->name, sizeof(msg.name)); |
316 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
317 | if (ret < 0) { | |
318 | goto error_io; | |
319 | } | |
320 | ||
321 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
322 | if (ret < 0) { | |
323 | goto error_io; | |
324 | } | |
325 | ||
326 | switch (be32toh(reply.ret_code)) { | |
327 | case JUL_RET_CODE_SUCCESS: | |
328 | break; | |
329 | case JUL_RET_CODE_UNKNOWN_NAME: | |
330 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
331 | goto error; | |
332 | default: | |
333 | ERR("Java agent returned an unknown code: %" PRIu32, | |
334 | be32toh(reply.ret_code)); | |
335 | ret = LTTNG_ERR_FATAL; | |
336 | goto error; | |
337 | } | |
338 | ||
339 | return LTTNG_OK; | |
340 | ||
341 | error_io: | |
342 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
343 | error: | |
344 | return ret; | |
345 | } | |
346 | ||
347 | /* | |
348 | * Enable JUL event on every JUL applications registered with the session | |
349 | * daemon. | |
350 | * | |
351 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
352 | */ | |
353 | int jul_enable_event(struct jul_event *event) | |
354 | { | |
355 | int ret; | |
356 | struct jul_app *app; | |
357 | struct lttng_ht_iter iter; | |
358 | ||
359 | assert(event); | |
360 | ||
361 | rcu_read_lock(); | |
362 | ||
363 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, | |
364 | node.node) { | |
365 | /* Enable event on JUL application through TCP socket. */ | |
366 | ret = enable_event(app, event); | |
367 | if (ret != LTTNG_OK) { | |
368 | goto error; | |
369 | } | |
f20baf8e DG |
370 | } |
371 | ||
3c6a091f | 372 | event->enabled = 1; |
f20baf8e DG |
373 | ret = LTTNG_OK; |
374 | ||
375 | error: | |
376 | rcu_read_unlock(); | |
377 | return ret; | |
378 | } | |
379 | ||
380 | /* | |
381 | * Disable JUL event on every JUL applications registered with the session | |
382 | * daemon. | |
383 | * | |
384 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
385 | */ | |
386 | int jul_disable_event(struct jul_event *event) | |
387 | { | |
388 | int ret; | |
389 | struct jul_app *app; | |
390 | struct lttng_ht_iter iter; | |
391 | ||
392 | assert(event); | |
393 | ||
394 | rcu_read_lock(); | |
395 | ||
396 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, | |
397 | node.node) { | |
398 | /* Enable event on JUL application through TCP socket. */ | |
399 | ret = disable_event(app, event); | |
400 | if (ret != LTTNG_OK) { | |
401 | goto error; | |
402 | } | |
f20baf8e DG |
403 | } |
404 | ||
3c6a091f | 405 | event->enabled = 0; |
f20baf8e DG |
406 | ret = LTTNG_OK; |
407 | ||
408 | error: | |
409 | rcu_read_unlock(); | |
410 | return ret; | |
411 | } | |
412 | ||
413 | /* | |
414 | * Ask every java agent for the list of possible event (logger name). Events is | |
415 | * allocated with the events of every JUL application. | |
416 | * | |
417 | * Return the number of events or else a negative value. | |
418 | */ | |
419 | int jul_list_events(struct lttng_event **events) | |
420 | { | |
421 | int ret; | |
422 | size_t nbmem, count = 0; | |
423 | struct jul_app *app; | |
aae6255e | 424 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
425 | struct lttng_ht_iter iter; |
426 | ||
427 | assert(events); | |
428 | ||
429 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
430 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
431 | if (!tmp_events) { | |
432 | PERROR("zmalloc jul list events"); | |
433 | ret = -ENOMEM; | |
434 | goto error; | |
435 | } | |
436 | ||
437 | rcu_read_lock(); | |
438 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, | |
439 | node.node) { | |
440 | ssize_t nb_ev; | |
441 | struct lttng_event *jul_events; | |
442 | ||
443 | nb_ev = list_events(app, &jul_events); | |
444 | if (nb_ev < 0) { | |
445 | ret = nb_ev; | |
428de77a | 446 | goto error_unlock; |
f20baf8e DG |
447 | } |
448 | ||
53efb85a | 449 | if (count + nb_ev > nbmem) { |
f20baf8e | 450 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
451 | struct lttng_event *new_tmp_events; |
452 | size_t new_nbmem; | |
453 | ||
454 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
455 | DBG2("Reallocating JUL event list from %zu to %zu entries", | |
456 | nbmem, new_nbmem); | |
457 | new_tmp_events = realloc(tmp_events, | |
458 | new_nbmem * sizeof(*new_tmp_events)); | |
459 | if (!new_tmp_events) { | |
f20baf8e | 460 | PERROR("realloc JUL events"); |
f20baf8e | 461 | ret = -ENOMEM; |
c36441a9 | 462 | free(jul_events); |
428de77a | 463 | goto error_unlock; |
f20baf8e | 464 | } |
53efb85a MD |
465 | /* Zero the new memory */ |
466 | memset(new_tmp_events + nbmem, 0, | |
467 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
468 | nbmem = new_nbmem; | |
469 | tmp_events = new_tmp_events; | |
f20baf8e | 470 | } |
53efb85a MD |
471 | memcpy(tmp_events + count, jul_events, |
472 | nb_ev * sizeof(*tmp_events)); | |
f20baf8e DG |
473 | free(jul_events); |
474 | count += nb_ev; | |
475 | } | |
476 | rcu_read_unlock(); | |
477 | ||
478 | ret = count; | |
479 | *events = tmp_events; | |
aae6255e | 480 | return ret; |
f20baf8e | 481 | |
428de77a MD |
482 | error_unlock: |
483 | rcu_read_unlock(); | |
f20baf8e | 484 | error: |
aae6255e | 485 | free(tmp_events); |
f20baf8e DG |
486 | return ret; |
487 | } | |
488 | ||
489 | /* | |
490 | * Create a JUL app object using the given PID. | |
491 | * | |
492 | * Return newly allocated object or else NULL on error. | |
493 | */ | |
494 | struct jul_app *jul_create_app(pid_t pid, struct lttcomm_sock *sock) | |
495 | { | |
496 | struct jul_app *app; | |
497 | ||
498 | assert(sock); | |
499 | ||
500 | app = zmalloc(sizeof(*app)); | |
501 | if (!app) { | |
502 | PERROR("zmalloc JUL create"); | |
503 | goto error; | |
504 | } | |
505 | ||
506 | app->pid = pid; | |
507 | app->sock = sock; | |
f20baf8e DG |
508 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
509 | ||
510 | error: | |
511 | return app; | |
512 | } | |
513 | ||
514 | /* | |
515 | * Lookup JUL app by socket in the global hash table. | |
516 | * | |
517 | * RCU read side lock MUST be acquired. | |
518 | * | |
519 | * Return object if found else NULL. | |
520 | */ | |
521 | struct jul_app *jul_find_app_by_sock(int sock) | |
522 | { | |
523 | struct lttng_ht_node_ulong *node; | |
524 | struct lttng_ht_iter iter; | |
525 | struct jul_app *app; | |
526 | ||
527 | assert(sock >= 0); | |
528 | ||
529 | lttng_ht_lookup(jul_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); | |
530 | node = lttng_ht_iter_get_node_ulong(&iter); | |
531 | if (node == NULL) { | |
532 | goto error; | |
533 | } | |
534 | app = caa_container_of(node, struct jul_app, node); | |
535 | ||
536 | DBG3("JUL app pid %d found by sock %d.", app->pid, sock); | |
537 | return app; | |
538 | ||
539 | error: | |
540 | DBG3("JUL app NOT found by sock %d.", sock); | |
541 | return NULL; | |
542 | } | |
543 | ||
544 | /* | |
545 | * Add JUL application object to a given hash table. | |
546 | */ | |
547 | void jul_add_app(struct jul_app *app) | |
548 | { | |
549 | assert(app); | |
550 | ||
551 | DBG3("JUL adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); | |
552 | ||
553 | rcu_read_lock(); | |
554 | lttng_ht_add_unique_ulong(jul_apps_ht_by_sock, &app->node); | |
555 | rcu_read_unlock(); | |
556 | } | |
557 | ||
f20baf8e DG |
558 | /* |
559 | * Delete JUL application from the global hash table. | |
560 | */ | |
561 | void jul_delete_app(struct jul_app *app) | |
562 | { | |
563 | int ret; | |
564 | struct lttng_ht_iter iter; | |
565 | ||
566 | assert(app); | |
567 | ||
568 | DBG3("JUL deleting app pid: %d and sock: %d", app->pid, app->sock->fd); | |
569 | ||
570 | iter.iter.node = &app->node.node; | |
571 | rcu_read_lock(); | |
572 | ret = lttng_ht_del(jul_apps_ht_by_sock, &iter); | |
573 | rcu_read_unlock(); | |
574 | assert(!ret); | |
575 | } | |
576 | ||
577 | /* | |
578 | * Destroy a JUL application object by detaching it from its corresponding UST | |
428de77a MD |
579 | * app if one is connected by closing the socket. Finally, perform a |
580 | * delayed memory reclaim. | |
f20baf8e DG |
581 | */ |
582 | void jul_destroy_app(struct jul_app *app) | |
583 | { | |
584 | assert(app); | |
585 | ||
586 | if (app->sock) { | |
587 | app->sock->ops->close(app->sock); | |
588 | lttcomm_destroy_sock(app->sock); | |
589 | } | |
590 | ||
591 | call_rcu(&app->node.head, destroy_app_jul_rcu); | |
592 | } | |
593 | ||
0475c50c DG |
594 | /* |
595 | * Initialize an already allocated JUL domain object. | |
596 | * | |
597 | * Return 0 on success or else a negative errno value. | |
598 | */ | |
599 | int jul_init_domain(struct jul_domain *dom) | |
600 | { | |
601 | int ret; | |
602 | ||
603 | assert(dom); | |
604 | ||
605 | dom->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
606 | if (!dom->events) { | |
607 | ret = -ENOMEM; | |
608 | goto error; | |
609 | } | |
610 | ||
611 | return 0; | |
612 | ||
613 | error: | |
614 | return ret; | |
615 | } | |
616 | ||
617 | /* | |
618 | * Create a newly allocated JUL event data structure. If name is valid, it's | |
619 | * copied into the created event. | |
620 | * | |
621 | * Return a new object else NULL on error. | |
622 | */ | |
623 | struct jul_event *jul_create_event(const char *name) | |
624 | { | |
625 | struct jul_event *event; | |
626 | ||
627 | DBG3("JUL create new event with name %s", name); | |
628 | ||
629 | event = zmalloc(sizeof(*event)); | |
630 | if (!event) { | |
631 | goto error; | |
632 | } | |
633 | ||
634 | if (name) { | |
635 | strncpy(event->name, name, sizeof(event->name)); | |
636 | event->name[sizeof(event->name) - 1] = '\0'; | |
f20baf8e | 637 | lttng_ht_node_init_str(&event->node, event->name); |
0475c50c DG |
638 | } |
639 | ||
640 | error: | |
641 | return event; | |
642 | } | |
643 | ||
644 | /* | |
645 | * Unique add of a JUL event to a given domain. | |
646 | */ | |
647 | void jul_add_event(struct jul_event *event, struct jul_domain *dom) | |
648 | { | |
649 | assert(event); | |
650 | assert(dom); | |
651 | assert(dom->events); | |
652 | ||
653 | DBG3("JUL adding event %s to domain", event->name); | |
654 | ||
f20baf8e | 655 | rcu_read_lock(); |
0475c50c | 656 | lttng_ht_add_unique_str(dom->events, &event->node); |
f20baf8e | 657 | rcu_read_unlock(); |
3c6a091f | 658 | dom->being_used = 1; |
0475c50c DG |
659 | } |
660 | ||
661 | /* | |
662 | * Find a JUL event in the given domain using name. | |
663 | * | |
664 | * RCU read side lock MUST be acquired. | |
665 | * | |
666 | * Return object if found else NULL. | |
667 | */ | |
668 | struct jul_event *jul_find_by_name(const char *name, struct jul_domain *dom) | |
669 | { | |
670 | struct lttng_ht_node_str *node; | |
671 | struct lttng_ht_iter iter; | |
672 | ||
673 | assert(name); | |
674 | assert(dom); | |
675 | assert(dom->events); | |
676 | ||
677 | lttng_ht_lookup(dom->events, (void *)name, &iter); | |
678 | node = lttng_ht_iter_get_node_str(&iter); | |
679 | if (node == NULL) { | |
680 | goto error; | |
681 | } | |
682 | ||
683 | DBG3("JUL found by name %s in domain.", name); | |
684 | return caa_container_of(node, struct jul_event, node); | |
685 | ||
686 | error: | |
687 | DBG3("JUL NOT found by name %s in domain.", name); | |
688 | return NULL; | |
689 | } | |
690 | ||
0475c50c | 691 | /* |
428de77a MD |
692 | * Free given JUL event. This event must not be globally visible at this |
693 | * point (only expected to be used on failure just after event | |
694 | * creation). After this call, the pointer is not usable anymore. | |
0475c50c DG |
695 | */ |
696 | void jul_destroy_event(struct jul_event *event) | |
697 | { | |
698 | assert(event); | |
699 | ||
700 | free(event); | |
701 | } | |
702 | ||
703 | /* | |
704 | * Destroy a JUL domain completely. Note that the given pointer is NOT freed | |
428de77a | 705 | * thus a reference to static or stack data can be passed to this function. |
0475c50c DG |
706 | */ |
707 | void jul_destroy_domain(struct jul_domain *dom) | |
708 | { | |
709 | struct lttng_ht_node_str *node; | |
710 | struct lttng_ht_iter iter; | |
711 | ||
712 | assert(dom); | |
713 | ||
714 | DBG3("JUL destroy domain"); | |
715 | ||
716 | /* | |
717 | * Just ignore if no events hash table exists. This is possible if for | |
718 | * instance a JUL domain object was allocated but not initialized. | |
719 | */ | |
720 | if (!dom->events) { | |
721 | return; | |
722 | } | |
723 | ||
724 | rcu_read_lock(); | |
725 | cds_lfht_for_each_entry(dom->events->ht, &iter.iter, node, node) { | |
726 | int ret; | |
727 | ||
728 | ret = lttng_ht_del(dom->events, &iter); | |
729 | assert(!ret); | |
730 | call_rcu(&node->head, destroy_event_jul_rcu); | |
731 | } | |
732 | rcu_read_unlock(); | |
733 | ||
f20baf8e DG |
734 | lttng_ht_destroy(dom->events); |
735 | } | |
736 | ||
737 | /* | |
738 | * Initialize JUL subsystem. | |
739 | */ | |
740 | int jul_init(void) | |
741 | { | |
742 | jul_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
743 | if (!jul_apps_ht_by_sock) { | |
744 | return -1; | |
745 | } | |
746 | ||
747 | return 0; | |
748 | } | |
749 | ||
750 | /* | |
751 | * Update a JUL application (given socket) using the given domain. | |
752 | * | |
753 | * Note that this function is most likely to be used with a tracing session | |
754 | * thus the caller should make sure to hold the appropriate lock(s). | |
755 | */ | |
756 | void jul_update(struct jul_domain *domain, int sock) | |
757 | { | |
758 | int ret; | |
759 | struct jul_app *app; | |
760 | struct jul_event *event; | |
761 | struct lttng_ht_iter iter; | |
762 | ||
763 | assert(domain); | |
764 | assert(sock >= 0); | |
765 | ||
766 | DBG("JUL updating app socket %d", sock); | |
767 | ||
768 | rcu_read_lock(); | |
769 | cds_lfht_for_each_entry(domain->events->ht, &iter.iter, event, node.node) { | |
770 | /* Skip event if disabled. */ | |
771 | if (!event->enabled) { | |
772 | continue; | |
773 | } | |
774 | ||
775 | app = jul_find_app_by_sock(sock); | |
776 | /* | |
777 | * We are in the registration path thus if the application is gone, | |
778 | * there is a serious code flow error. | |
779 | */ | |
780 | assert(app); | |
781 | ||
782 | ret = enable_event(app, event); | |
783 | if (ret != LTTNG_OK) { | |
784 | DBG2("JUL update unable to enable event %s on app pid: %d sock %d", | |
785 | event->name, app->pid, app->sock->fd); | |
786 | /* Let's try the others here and don't assume the app is dead. */ | |
787 | continue; | |
788 | } | |
789 | } | |
790 | rcu_read_unlock(); | |
0475c50c | 791 | } |