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 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 | ||
1b500e7a DG |
347 | /* |
348 | * Send back the registration DONE command to a given JUL application. | |
349 | * | |
350 | * Return 0 on success or else a negative value. | |
351 | */ | |
352 | int jul_send_registration_done(struct jul_app *app) | |
353 | { | |
354 | assert(app); | |
355 | assert(app->sock); | |
356 | ||
357 | DBG("JUL sending registration done to app socket %d", app->sock->fd); | |
358 | ||
359 | return send_header(app->sock, 0, JUL_CMD_REG_DONE, 0); | |
360 | } | |
361 | ||
f20baf8e DG |
362 | /* |
363 | * Enable JUL event on every JUL applications registered with the session | |
364 | * daemon. | |
365 | * | |
366 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
367 | */ | |
368 | int jul_enable_event(struct jul_event *event) | |
369 | { | |
370 | int ret; | |
371 | struct jul_app *app; | |
372 | struct lttng_ht_iter iter; | |
373 | ||
374 | assert(event); | |
375 | ||
376 | rcu_read_lock(); | |
377 | ||
378 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, | |
379 | node.node) { | |
380 | /* Enable event on JUL application through TCP socket. */ | |
381 | ret = enable_event(app, event); | |
382 | if (ret != LTTNG_OK) { | |
383 | goto error; | |
384 | } | |
f20baf8e DG |
385 | } |
386 | ||
3c6a091f | 387 | event->enabled = 1; |
f20baf8e DG |
388 | ret = LTTNG_OK; |
389 | ||
390 | error: | |
391 | rcu_read_unlock(); | |
392 | return ret; | |
393 | } | |
394 | ||
395 | /* | |
396 | * Disable JUL event on every JUL applications registered with the session | |
397 | * daemon. | |
398 | * | |
399 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
400 | */ | |
401 | int jul_disable_event(struct jul_event *event) | |
402 | { | |
403 | int ret; | |
404 | struct jul_app *app; | |
405 | struct lttng_ht_iter iter; | |
406 | ||
407 | assert(event); | |
408 | ||
409 | rcu_read_lock(); | |
410 | ||
411 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, | |
412 | node.node) { | |
413 | /* Enable event on JUL application through TCP socket. */ | |
414 | ret = disable_event(app, event); | |
415 | if (ret != LTTNG_OK) { | |
416 | goto error; | |
417 | } | |
f20baf8e DG |
418 | } |
419 | ||
3c6a091f | 420 | event->enabled = 0; |
f20baf8e DG |
421 | ret = LTTNG_OK; |
422 | ||
423 | error: | |
424 | rcu_read_unlock(); | |
425 | return ret; | |
426 | } | |
427 | ||
428 | /* | |
429 | * Ask every java agent for the list of possible event (logger name). Events is | |
430 | * allocated with the events of every JUL application. | |
431 | * | |
432 | * Return the number of events or else a negative value. | |
433 | */ | |
434 | int jul_list_events(struct lttng_event **events) | |
435 | { | |
436 | int ret; | |
437 | size_t nbmem, count = 0; | |
438 | struct jul_app *app; | |
aae6255e | 439 | struct lttng_event *tmp_events = NULL; |
f20baf8e DG |
440 | struct lttng_ht_iter iter; |
441 | ||
442 | assert(events); | |
443 | ||
444 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
445 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
446 | if (!tmp_events) { | |
447 | PERROR("zmalloc jul list events"); | |
448 | ret = -ENOMEM; | |
449 | goto error; | |
450 | } | |
451 | ||
452 | rcu_read_lock(); | |
453 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, | |
454 | node.node) { | |
455 | ssize_t nb_ev; | |
456 | struct lttng_event *jul_events; | |
457 | ||
458 | nb_ev = list_events(app, &jul_events); | |
459 | if (nb_ev < 0) { | |
460 | ret = nb_ev; | |
428de77a | 461 | goto error_unlock; |
f20baf8e DG |
462 | } |
463 | ||
53efb85a | 464 | if (count + nb_ev > nbmem) { |
f20baf8e | 465 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
466 | struct lttng_event *new_tmp_events; |
467 | size_t new_nbmem; | |
468 | ||
469 | new_nbmem = max_t(size_t, count + nb_ev, nbmem << 1); | |
470 | DBG2("Reallocating JUL event list from %zu to %zu entries", | |
471 | nbmem, new_nbmem); | |
472 | new_tmp_events = realloc(tmp_events, | |
473 | new_nbmem * sizeof(*new_tmp_events)); | |
474 | if (!new_tmp_events) { | |
f20baf8e | 475 | PERROR("realloc JUL events"); |
f20baf8e | 476 | ret = -ENOMEM; |
c36441a9 | 477 | free(jul_events); |
428de77a | 478 | goto error_unlock; |
f20baf8e | 479 | } |
53efb85a MD |
480 | /* Zero the new memory */ |
481 | memset(new_tmp_events + nbmem, 0, | |
482 | (new_nbmem - nbmem) * sizeof(*new_tmp_events)); | |
483 | nbmem = new_nbmem; | |
484 | tmp_events = new_tmp_events; | |
f20baf8e | 485 | } |
53efb85a MD |
486 | memcpy(tmp_events + count, jul_events, |
487 | nb_ev * sizeof(*tmp_events)); | |
f20baf8e DG |
488 | free(jul_events); |
489 | count += nb_ev; | |
490 | } | |
491 | rcu_read_unlock(); | |
492 | ||
493 | ret = count; | |
494 | *events = tmp_events; | |
aae6255e | 495 | return ret; |
f20baf8e | 496 | |
428de77a MD |
497 | error_unlock: |
498 | rcu_read_unlock(); | |
f20baf8e | 499 | error: |
aae6255e | 500 | free(tmp_events); |
f20baf8e DG |
501 | return ret; |
502 | } | |
503 | ||
504 | /* | |
505 | * Create a JUL app object using the given PID. | |
506 | * | |
507 | * Return newly allocated object or else NULL on error. | |
508 | */ | |
509 | struct jul_app *jul_create_app(pid_t pid, struct lttcomm_sock *sock) | |
510 | { | |
511 | struct jul_app *app; | |
512 | ||
513 | assert(sock); | |
514 | ||
515 | app = zmalloc(sizeof(*app)); | |
516 | if (!app) { | |
517 | PERROR("zmalloc JUL create"); | |
518 | goto error; | |
519 | } | |
520 | ||
521 | app->pid = pid; | |
522 | app->sock = sock; | |
f20baf8e DG |
523 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
524 | ||
525 | error: | |
526 | return app; | |
527 | } | |
528 | ||
529 | /* | |
530 | * Lookup JUL app by socket in the global hash table. | |
531 | * | |
532 | * RCU read side lock MUST be acquired. | |
533 | * | |
534 | * Return object if found else NULL. | |
535 | */ | |
536 | struct jul_app *jul_find_app_by_sock(int sock) | |
537 | { | |
538 | struct lttng_ht_node_ulong *node; | |
539 | struct lttng_ht_iter iter; | |
540 | struct jul_app *app; | |
541 | ||
542 | assert(sock >= 0); | |
543 | ||
544 | lttng_ht_lookup(jul_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); | |
545 | node = lttng_ht_iter_get_node_ulong(&iter); | |
546 | if (node == NULL) { | |
547 | goto error; | |
548 | } | |
549 | app = caa_container_of(node, struct jul_app, node); | |
550 | ||
551 | DBG3("JUL app pid %d found by sock %d.", app->pid, sock); | |
552 | return app; | |
553 | ||
554 | error: | |
555 | DBG3("JUL app NOT found by sock %d.", sock); | |
556 | return NULL; | |
557 | } | |
558 | ||
559 | /* | |
560 | * Add JUL application object to a given hash table. | |
561 | */ | |
562 | void jul_add_app(struct jul_app *app) | |
563 | { | |
564 | assert(app); | |
565 | ||
566 | DBG3("JUL adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); | |
567 | ||
568 | rcu_read_lock(); | |
569 | lttng_ht_add_unique_ulong(jul_apps_ht_by_sock, &app->node); | |
570 | rcu_read_unlock(); | |
571 | } | |
572 | ||
f20baf8e DG |
573 | /* |
574 | * Delete JUL application from the global hash table. | |
575 | */ | |
576 | void jul_delete_app(struct jul_app *app) | |
577 | { | |
578 | int ret; | |
579 | struct lttng_ht_iter iter; | |
580 | ||
581 | assert(app); | |
582 | ||
583 | DBG3("JUL deleting app pid: %d and sock: %d", app->pid, app->sock->fd); | |
584 | ||
585 | iter.iter.node = &app->node.node; | |
586 | rcu_read_lock(); | |
587 | ret = lttng_ht_del(jul_apps_ht_by_sock, &iter); | |
588 | rcu_read_unlock(); | |
589 | assert(!ret); | |
590 | } | |
591 | ||
592 | /* | |
593 | * Destroy a JUL application object by detaching it from its corresponding UST | |
428de77a MD |
594 | * app if one is connected by closing the socket. Finally, perform a |
595 | * delayed memory reclaim. | |
f20baf8e DG |
596 | */ |
597 | void jul_destroy_app(struct jul_app *app) | |
598 | { | |
599 | assert(app); | |
600 | ||
601 | if (app->sock) { | |
602 | app->sock->ops->close(app->sock); | |
603 | lttcomm_destroy_sock(app->sock); | |
604 | } | |
605 | ||
606 | call_rcu(&app->node.head, destroy_app_jul_rcu); | |
607 | } | |
608 | ||
0475c50c DG |
609 | /* |
610 | * Initialize an already allocated JUL domain object. | |
611 | * | |
612 | * Return 0 on success or else a negative errno value. | |
613 | */ | |
614 | int jul_init_domain(struct jul_domain *dom) | |
615 | { | |
616 | int ret; | |
617 | ||
618 | assert(dom); | |
619 | ||
620 | dom->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
621 | if (!dom->events) { | |
622 | ret = -ENOMEM; | |
623 | goto error; | |
624 | } | |
625 | ||
626 | return 0; | |
627 | ||
628 | error: | |
629 | return ret; | |
630 | } | |
631 | ||
632 | /* | |
633 | * Create a newly allocated JUL event data structure. If name is valid, it's | |
634 | * copied into the created event. | |
635 | * | |
636 | * Return a new object else NULL on error. | |
637 | */ | |
638 | struct jul_event *jul_create_event(const char *name) | |
639 | { | |
640 | struct jul_event *event; | |
641 | ||
642 | DBG3("JUL create new event with name %s", name); | |
643 | ||
644 | event = zmalloc(sizeof(*event)); | |
645 | if (!event) { | |
646 | goto error; | |
647 | } | |
648 | ||
649 | if (name) { | |
650 | strncpy(event->name, name, sizeof(event->name)); | |
651 | event->name[sizeof(event->name) - 1] = '\0'; | |
f20baf8e | 652 | lttng_ht_node_init_str(&event->node, event->name); |
0475c50c DG |
653 | } |
654 | ||
655 | error: | |
656 | return event; | |
657 | } | |
658 | ||
659 | /* | |
660 | * Unique add of a JUL event to a given domain. | |
661 | */ | |
662 | void jul_add_event(struct jul_event *event, struct jul_domain *dom) | |
663 | { | |
664 | assert(event); | |
665 | assert(dom); | |
666 | assert(dom->events); | |
667 | ||
668 | DBG3("JUL adding event %s to domain", event->name); | |
669 | ||
f20baf8e | 670 | rcu_read_lock(); |
0475c50c | 671 | lttng_ht_add_unique_str(dom->events, &event->node); |
f20baf8e | 672 | rcu_read_unlock(); |
3c6a091f | 673 | dom->being_used = 1; |
0475c50c DG |
674 | } |
675 | ||
676 | /* | |
677 | * Find a JUL event in the given domain using name. | |
678 | * | |
679 | * RCU read side lock MUST be acquired. | |
680 | * | |
681 | * Return object if found else NULL. | |
682 | */ | |
683 | struct jul_event *jul_find_by_name(const char *name, struct jul_domain *dom) | |
684 | { | |
685 | struct lttng_ht_node_str *node; | |
686 | struct lttng_ht_iter iter; | |
687 | ||
688 | assert(name); | |
689 | assert(dom); | |
690 | assert(dom->events); | |
691 | ||
692 | lttng_ht_lookup(dom->events, (void *)name, &iter); | |
693 | node = lttng_ht_iter_get_node_str(&iter); | |
694 | if (node == NULL) { | |
695 | goto error; | |
696 | } | |
697 | ||
698 | DBG3("JUL found by name %s in domain.", name); | |
699 | return caa_container_of(node, struct jul_event, node); | |
700 | ||
701 | error: | |
702 | DBG3("JUL NOT found by name %s in domain.", name); | |
703 | return NULL; | |
704 | } | |
705 | ||
0475c50c | 706 | /* |
428de77a MD |
707 | * Free given JUL event. This event must not be globally visible at this |
708 | * point (only expected to be used on failure just after event | |
709 | * creation). After this call, the pointer is not usable anymore. | |
0475c50c DG |
710 | */ |
711 | void jul_destroy_event(struct jul_event *event) | |
712 | { | |
713 | assert(event); | |
714 | ||
715 | free(event); | |
716 | } | |
717 | ||
718 | /* | |
719 | * Destroy a JUL domain completely. Note that the given pointer is NOT freed | |
428de77a | 720 | * thus a reference to static or stack data can be passed to this function. |
0475c50c DG |
721 | */ |
722 | void jul_destroy_domain(struct jul_domain *dom) | |
723 | { | |
724 | struct lttng_ht_node_str *node; | |
725 | struct lttng_ht_iter iter; | |
726 | ||
727 | assert(dom); | |
728 | ||
729 | DBG3("JUL destroy domain"); | |
730 | ||
731 | /* | |
732 | * Just ignore if no events hash table exists. This is possible if for | |
733 | * instance a JUL domain object was allocated but not initialized. | |
734 | */ | |
735 | if (!dom->events) { | |
736 | return; | |
737 | } | |
738 | ||
739 | rcu_read_lock(); | |
740 | cds_lfht_for_each_entry(dom->events->ht, &iter.iter, node, node) { | |
741 | int ret; | |
742 | ||
743 | ret = lttng_ht_del(dom->events, &iter); | |
744 | assert(!ret); | |
745 | call_rcu(&node->head, destroy_event_jul_rcu); | |
746 | } | |
747 | rcu_read_unlock(); | |
748 | ||
f20baf8e DG |
749 | lttng_ht_destroy(dom->events); |
750 | } | |
751 | ||
752 | /* | |
753 | * Initialize JUL subsystem. | |
754 | */ | |
755 | int jul_init(void) | |
756 | { | |
757 | jul_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
758 | if (!jul_apps_ht_by_sock) { | |
759 | return -1; | |
760 | } | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
765 | /* | |
766 | * Update a JUL application (given socket) using the given domain. | |
767 | * | |
768 | * Note that this function is most likely to be used with a tracing session | |
769 | * thus the caller should make sure to hold the appropriate lock(s). | |
770 | */ | |
771 | void jul_update(struct jul_domain *domain, int sock) | |
772 | { | |
773 | int ret; | |
774 | struct jul_app *app; | |
775 | struct jul_event *event; | |
776 | struct lttng_ht_iter iter; | |
777 | ||
778 | assert(domain); | |
779 | assert(sock >= 0); | |
780 | ||
781 | DBG("JUL updating app socket %d", sock); | |
782 | ||
783 | rcu_read_lock(); | |
784 | cds_lfht_for_each_entry(domain->events->ht, &iter.iter, event, node.node) { | |
785 | /* Skip event if disabled. */ | |
786 | if (!event->enabled) { | |
787 | continue; | |
788 | } | |
789 | ||
790 | app = jul_find_app_by_sock(sock); | |
791 | /* | |
792 | * We are in the registration path thus if the application is gone, | |
793 | * there is a serious code flow error. | |
794 | */ | |
795 | assert(app); | |
796 | ||
797 | ret = enable_event(app, event); | |
798 | if (ret != LTTNG_OK) { | |
799 | DBG2("JUL update unable to enable event %s on app pid: %d sock %d", | |
800 | event->name, app->pid, app->sock->fd); | |
801 | /* Let's try the others here and don't assume the app is dead. */ | |
802 | continue; | |
803 | } | |
804 | } | |
805 | rcu_read_unlock(); | |
0475c50c | 806 | } |