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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 | /* | |
30 | * URCU intermediate call to complete destroy a JUL event. | |
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 DG |
42 | /* |
43 | * URCU intermediate call to complete destroy a JUL event. | |
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 | /* | |
56 | * Communication with Java agent call. Send the message header to the given | |
57 | * socket all in big endian. | |
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 | ||
70 | msg.data_size = htobe64(data_size); | |
71 | msg.cmd = htobe32(cmd); | |
72 | msg.cmd_version = htobe32(cmd_version); | |
73 | ||
74 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); | |
75 | if (size < sizeof(msg)) { | |
76 | ret = -errno; | |
77 | goto error; | |
78 | } | |
79 | ret = 0; | |
80 | ||
81 | error: | |
82 | return ret; | |
83 | } | |
84 | ||
85 | /* | |
86 | * Communication call with the Java agent. Send the payload to the given | |
87 | * socket. The header MUST be sent prior to this call. | |
88 | * | |
89 | * Return 0 on success or else a negative errno value of sendmsg() op. | |
90 | */ | |
91 | static int send_payload(struct lttcomm_sock *sock, void *data, | |
92 | size_t size) | |
93 | { | |
94 | int ret; | |
95 | ssize_t len; | |
96 | ||
97 | assert(sock); | |
98 | assert(data); | |
99 | ||
100 | len = sock->ops->sendmsg(sock, data, size, 0); | |
101 | if (len < size) { | |
102 | ret = -errno; | |
103 | goto error; | |
104 | } | |
105 | ret = 0; | |
106 | ||
107 | error: | |
108 | return ret; | |
109 | } | |
110 | ||
111 | /* | |
112 | * Communication call with the Java agent. Receive reply from the agent using | |
113 | * the given socket. | |
114 | * | |
115 | * Return 0 on success or else a negative errno value from recvmsg() op. | |
116 | */ | |
117 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) | |
118 | { | |
119 | int ret; | |
120 | ssize_t len; | |
121 | ||
122 | assert(sock); | |
123 | assert(buf); | |
124 | ||
125 | len = sock->ops->recvmsg(sock, buf, size, 0); | |
126 | if (len < size) { | |
127 | ret = -errno; | |
128 | goto error; | |
129 | } | |
130 | ret = 0; | |
131 | ||
132 | error: | |
133 | return ret; | |
134 | } | |
135 | ||
136 | /* | |
137 | * Internal enable JUL event call on a JUL application. This function | |
138 | * communicates with the Java agent to enable a given event (Logger name). | |
139 | * | |
140 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
141 | */ | |
142 | static int enable_event(struct jul_app *app, struct jul_event *event) | |
143 | { | |
144 | int ret; | |
145 | uint64_t data_size; | |
146 | struct lttcomm_jul_enable msg; | |
147 | struct lttcomm_jul_generic_reply reply; | |
148 | ||
149 | assert(app); | |
150 | assert(app->sock); | |
151 | assert(event); | |
152 | ||
153 | DBG2("JUL enabling event %s for app pid: %d and socket %d", event->name, | |
154 | app->pid, app->sock->fd); | |
155 | ||
156 | data_size = sizeof(msg); | |
157 | ||
158 | ret = send_header(app->sock, data_size, JUL_CMD_ENABLE, 0); | |
159 | if (ret < 0) { | |
160 | goto error_io; | |
161 | } | |
162 | ||
163 | strncpy(msg.name, event->name, sizeof(msg.name)); | |
164 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
165 | if (ret < 0) { | |
166 | goto error_io; | |
167 | } | |
168 | ||
169 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
170 | if (ret < 0) { | |
171 | goto error_io; | |
172 | } | |
173 | ||
174 | switch (be32toh(reply.ret_code)) { | |
175 | case JUL_RET_CODE_SUCCESS: | |
176 | break; | |
177 | case JUL_RET_CODE_UNKNOWN_NAME: | |
178 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
179 | goto error; | |
180 | default: | |
181 | ERR("Java agent returned an unknown code: %" PRIu32, | |
182 | be32toh(reply.ret_code)); | |
183 | ret = LTTNG_ERR_FATAL; | |
184 | goto error; | |
185 | } | |
186 | ||
187 | return LTTNG_OK; | |
188 | ||
189 | error_io: | |
190 | ret = LTTNG_ERR_UST_ENABLE_FAIL; | |
191 | error: | |
192 | return ret; | |
193 | } | |
194 | ||
195 | /* | |
196 | * Internal disable JUL event call on a JUL application. This function | |
197 | * communicates with the Java agent to disable a given event (Logger name). | |
198 | * | |
199 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
200 | */ | |
201 | static int disable_event(struct jul_app *app, struct jul_event *event) | |
202 | { | |
203 | int ret; | |
204 | uint64_t data_size; | |
205 | struct lttcomm_jul_disable msg; | |
206 | struct lttcomm_jul_generic_reply reply; | |
207 | ||
208 | assert(app); | |
209 | assert(app->sock); | |
210 | assert(event); | |
211 | ||
212 | DBG2("JUL disabling event %s for app pid: %d and socket %d", event->name, | |
213 | app->pid, app->sock->fd); | |
214 | ||
215 | data_size = sizeof(msg); | |
216 | ||
217 | ret = send_header(app->sock, data_size, JUL_CMD_DISABLE, 0); | |
218 | if (ret < 0) { | |
219 | goto error_io; | |
220 | } | |
221 | ||
222 | strncpy(msg.name, event->name, sizeof(msg.name)); | |
223 | ret = send_payload(app->sock, &msg, sizeof(msg)); | |
224 | if (ret < 0) { | |
225 | goto error_io; | |
226 | } | |
227 | ||
228 | ret = recv_reply(app->sock, &reply, sizeof(reply)); | |
229 | if (ret < 0) { | |
230 | goto error_io; | |
231 | } | |
232 | ||
233 | switch (be32toh(reply.ret_code)) { | |
234 | case JUL_RET_CODE_SUCCESS: | |
235 | break; | |
236 | case JUL_RET_CODE_UNKNOWN_NAME: | |
237 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; | |
238 | goto error; | |
239 | default: | |
240 | ERR("Java agent returned an unknown code: %" PRIu32, | |
241 | be32toh(reply.ret_code)); | |
242 | ret = LTTNG_ERR_FATAL; | |
243 | goto error; | |
244 | } | |
245 | ||
246 | return LTTNG_OK; | |
247 | ||
248 | error_io: | |
249 | ret = LTTNG_ERR_UST_DISABLE_FAIL; | |
250 | error: | |
251 | return ret; | |
252 | } | |
253 | ||
254 | /* | |
255 | * Enable JUL event on every JUL applications registered with the session | |
256 | * daemon. | |
257 | * | |
258 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
259 | */ | |
260 | int jul_enable_event(struct jul_event *event) | |
261 | { | |
262 | int ret; | |
263 | struct jul_app *app; | |
264 | struct lttng_ht_iter iter; | |
265 | ||
266 | assert(event); | |
267 | ||
268 | rcu_read_lock(); | |
269 | ||
270 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, | |
271 | node.node) { | |
272 | /* Enable event on JUL application through TCP socket. */ | |
273 | ret = enable_event(app, event); | |
274 | if (ret != LTTNG_OK) { | |
275 | goto error; | |
276 | } | |
277 | event->enabled = 1; | |
278 | } | |
279 | ||
280 | ret = LTTNG_OK; | |
281 | ||
282 | error: | |
283 | rcu_read_unlock(); | |
284 | return ret; | |
285 | } | |
286 | ||
287 | /* | |
288 | * Disable JUL event on every JUL applications registered with the session | |
289 | * daemon. | |
290 | * | |
291 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. | |
292 | */ | |
293 | int jul_disable_event(struct jul_event *event) | |
294 | { | |
295 | int ret; | |
296 | struct jul_app *app; | |
297 | struct lttng_ht_iter iter; | |
298 | ||
299 | assert(event); | |
300 | ||
301 | rcu_read_lock(); | |
302 | ||
303 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, | |
304 | node.node) { | |
305 | /* Enable event on JUL application through TCP socket. */ | |
306 | ret = disable_event(app, event); | |
307 | if (ret != LTTNG_OK) { | |
308 | goto error; | |
309 | } | |
310 | event->enabled = 0; | |
311 | } | |
312 | ||
313 | ret = LTTNG_OK; | |
314 | ||
315 | error: | |
316 | rcu_read_unlock(); | |
317 | return ret; | |
318 | } | |
319 | ||
320 | /* | |
321 | * Ask every java agent for the list of possible event (logger name). Events is | |
322 | * allocated with the events of every JUL application. | |
323 | * | |
324 | * Return the number of events or else a negative value. | |
325 | */ | |
326 | int jul_list_events(struct lttng_event **events) | |
327 | { | |
328 | int ret; | |
329 | size_t nbmem, count = 0; | |
330 | struct jul_app *app; | |
331 | struct lttng_event *tmp_events; | |
332 | struct lttng_ht_iter iter; | |
333 | ||
334 | assert(events); | |
335 | ||
336 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
337 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); | |
338 | if (!tmp_events) { | |
339 | PERROR("zmalloc jul list events"); | |
340 | ret = -ENOMEM; | |
341 | goto error; | |
342 | } | |
343 | ||
344 | rcu_read_lock(); | |
345 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, | |
346 | node.node) { | |
347 | ssize_t nb_ev; | |
348 | struct lttng_event *jul_events; | |
349 | ||
350 | nb_ev = list_events(app, &jul_events); | |
351 | if (nb_ev < 0) { | |
352 | ret = nb_ev; | |
353 | rcu_read_unlock(); | |
354 | goto error; | |
355 | } | |
356 | ||
357 | if (count >= nbmem) { | |
358 | /* In case the realloc fails, we free the memory */ | |
359 | void *ptr; | |
360 | ||
361 | DBG2("Reallocating JUL event list from %zu to %zu entries", nbmem, | |
362 | 2 * nbmem); | |
363 | nbmem *= 2; | |
364 | ptr = realloc(tmp_events, nbmem * sizeof(*tmp_events)); | |
365 | if (!ptr) { | |
366 | PERROR("realloc JUL events"); | |
367 | free(tmp_events); | |
368 | ret = -ENOMEM; | |
369 | rcu_read_unlock(); | |
370 | goto error; | |
371 | } | |
372 | tmp_events = ptr; | |
373 | } | |
374 | memcpy(tmp_events + (count * sizeof(*tmp_events)), jul_events, | |
375 | nb_ev * sizeof(*tmp_events)); | |
376 | free(jul_events); | |
377 | count += nb_ev; | |
378 | } | |
379 | rcu_read_unlock(); | |
380 | ||
381 | ret = count; | |
382 | *events = tmp_events; | |
383 | ||
384 | error: | |
385 | return ret; | |
386 | } | |
387 | ||
388 | /* | |
389 | * Create a JUL app object using the given PID. | |
390 | * | |
391 | * Return newly allocated object or else NULL on error. | |
392 | */ | |
393 | struct jul_app *jul_create_app(pid_t pid, struct lttcomm_sock *sock) | |
394 | { | |
395 | struct jul_app *app; | |
396 | ||
397 | assert(sock); | |
398 | ||
399 | app = zmalloc(sizeof(*app)); | |
400 | if (!app) { | |
401 | PERROR("zmalloc JUL create"); | |
402 | goto error; | |
403 | } | |
404 | ||
405 | app->pid = pid; | |
406 | app->sock = sock; | |
407 | /* Flag it invalid until assignation. */ | |
408 | app->ust_app_sock = -1; | |
409 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); | |
410 | ||
411 | error: | |
412 | return app; | |
413 | } | |
414 | ||
415 | /* | |
416 | * Lookup JUL app by socket in the global hash table. | |
417 | * | |
418 | * RCU read side lock MUST be acquired. | |
419 | * | |
420 | * Return object if found else NULL. | |
421 | */ | |
422 | struct jul_app *jul_find_app_by_sock(int sock) | |
423 | { | |
424 | struct lttng_ht_node_ulong *node; | |
425 | struct lttng_ht_iter iter; | |
426 | struct jul_app *app; | |
427 | ||
428 | assert(sock >= 0); | |
429 | ||
430 | lttng_ht_lookup(jul_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); | |
431 | node = lttng_ht_iter_get_node_ulong(&iter); | |
432 | if (node == NULL) { | |
433 | goto error; | |
434 | } | |
435 | app = caa_container_of(node, struct jul_app, node); | |
436 | ||
437 | DBG3("JUL app pid %d found by sock %d.", app->pid, sock); | |
438 | return app; | |
439 | ||
440 | error: | |
441 | DBG3("JUL app NOT found by sock %d.", sock); | |
442 | return NULL; | |
443 | } | |
444 | ||
445 | /* | |
446 | * Add JUL application object to a given hash table. | |
447 | */ | |
448 | void jul_add_app(struct jul_app *app) | |
449 | { | |
450 | assert(app); | |
451 | ||
452 | DBG3("JUL adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); | |
453 | ||
454 | rcu_read_lock(); | |
455 | lttng_ht_add_unique_ulong(jul_apps_ht_by_sock, &app->node); | |
456 | rcu_read_unlock(); | |
457 | } | |
458 | ||
459 | /* | |
460 | * Attach a given JUL application to an UST app object. This is done by copying | |
461 | * the socket fd value into the ust app obj. atomically. | |
462 | */ | |
463 | void jul_attach_app(struct jul_app *japp) | |
464 | { | |
465 | struct ust_app *uapp; | |
466 | ||
467 | assert(japp); | |
468 | ||
469 | rcu_read_lock(); | |
470 | uapp = ust_app_find_by_pid(japp->pid); | |
471 | if (!uapp) { | |
472 | goto end; | |
473 | } | |
474 | ||
475 | uatomic_set(&uapp->jul_app_sock, japp->sock->fd); | |
476 | ||
477 | DBG3("JUL app pid: %d, sock: %d attached to UST app.", japp->pid, | |
478 | japp->sock->fd); | |
479 | ||
480 | end: | |
481 | rcu_read_unlock(); | |
482 | return; | |
483 | } | |
484 | ||
485 | /* | |
486 | * Remove JUL app. reference from an UST app object and set it to NULL. | |
487 | */ | |
488 | void jul_detach_app(struct jul_app *japp) | |
489 | { | |
490 | struct ust_app *uapp; | |
491 | ||
492 | assert(japp); | |
493 | ||
494 | rcu_read_lock(); | |
495 | ||
496 | if (japp->ust_app_sock < 0) { | |
497 | goto end; | |
498 | } | |
499 | ||
500 | uapp = ust_app_find_by_sock(japp->ust_app_sock); | |
501 | if (!uapp) { | |
502 | goto end; | |
503 | } | |
504 | ||
505 | uapp->jul_app_sock = -1; | |
506 | ||
507 | end: | |
508 | rcu_read_unlock(); | |
509 | return; | |
510 | } | |
511 | ||
512 | /* | |
513 | * Delete JUL application from the global hash table. | |
514 | */ | |
515 | void jul_delete_app(struct jul_app *app) | |
516 | { | |
517 | int ret; | |
518 | struct lttng_ht_iter iter; | |
519 | ||
520 | assert(app); | |
521 | ||
522 | DBG3("JUL deleting app pid: %d and sock: %d", app->pid, app->sock->fd); | |
523 | ||
524 | iter.iter.node = &app->node.node; | |
525 | rcu_read_lock(); | |
526 | ret = lttng_ht_del(jul_apps_ht_by_sock, &iter); | |
527 | rcu_read_unlock(); | |
528 | assert(!ret); | |
529 | } | |
530 | ||
531 | /* | |
532 | * Destroy a JUL application object by detaching it from its corresponding UST | |
533 | * app if one, closing the socket and freeing the memory. | |
534 | */ | |
535 | void jul_destroy_app(struct jul_app *app) | |
536 | { | |
537 | assert(app); | |
538 | ||
539 | if (app->sock) { | |
540 | app->sock->ops->close(app->sock); | |
541 | lttcomm_destroy_sock(app->sock); | |
542 | } | |
543 | ||
544 | call_rcu(&app->node.head, destroy_app_jul_rcu); | |
545 | } | |
546 | ||
0475c50c DG |
547 | /* |
548 | * Initialize an already allocated JUL domain object. | |
549 | * | |
550 | * Return 0 on success or else a negative errno value. | |
551 | */ | |
552 | int jul_init_domain(struct jul_domain *dom) | |
553 | { | |
554 | int ret; | |
555 | ||
556 | assert(dom); | |
557 | ||
558 | dom->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
559 | if (!dom->events) { | |
560 | ret = -ENOMEM; | |
561 | goto error; | |
562 | } | |
563 | ||
564 | return 0; | |
565 | ||
566 | error: | |
567 | return ret; | |
568 | } | |
569 | ||
570 | /* | |
571 | * Create a newly allocated JUL event data structure. If name is valid, it's | |
572 | * copied into the created event. | |
573 | * | |
574 | * Return a new object else NULL on error. | |
575 | */ | |
576 | struct jul_event *jul_create_event(const char *name) | |
577 | { | |
578 | struct jul_event *event; | |
579 | ||
580 | DBG3("JUL create new event with name %s", name); | |
581 | ||
582 | event = zmalloc(sizeof(*event)); | |
583 | if (!event) { | |
584 | goto error; | |
585 | } | |
586 | ||
587 | if (name) { | |
588 | strncpy(event->name, name, sizeof(event->name)); | |
589 | event->name[sizeof(event->name) - 1] = '\0'; | |
f20baf8e | 590 | lttng_ht_node_init_str(&event->node, event->name); |
0475c50c DG |
591 | } |
592 | ||
593 | error: | |
594 | return event; | |
595 | } | |
596 | ||
597 | /* | |
598 | * Unique add of a JUL event to a given domain. | |
599 | */ | |
600 | void jul_add_event(struct jul_event *event, struct jul_domain *dom) | |
601 | { | |
602 | assert(event); | |
603 | assert(dom); | |
604 | assert(dom->events); | |
605 | ||
606 | DBG3("JUL adding event %s to domain", event->name); | |
607 | ||
f20baf8e | 608 | rcu_read_lock(); |
0475c50c | 609 | lttng_ht_add_unique_str(dom->events, &event->node); |
f20baf8e | 610 | rcu_read_unlock(); |
0475c50c DG |
611 | } |
612 | ||
613 | /* | |
614 | * Find a JUL event in the given domain using name. | |
615 | * | |
616 | * RCU read side lock MUST be acquired. | |
617 | * | |
618 | * Return object if found else NULL. | |
619 | */ | |
620 | struct jul_event *jul_find_by_name(const char *name, struct jul_domain *dom) | |
621 | { | |
622 | struct lttng_ht_node_str *node; | |
623 | struct lttng_ht_iter iter; | |
624 | ||
625 | assert(name); | |
626 | assert(dom); | |
627 | assert(dom->events); | |
628 | ||
629 | lttng_ht_lookup(dom->events, (void *)name, &iter); | |
630 | node = lttng_ht_iter_get_node_str(&iter); | |
631 | if (node == NULL) { | |
632 | goto error; | |
633 | } | |
634 | ||
635 | DBG3("JUL found by name %s in domain.", name); | |
636 | return caa_container_of(node, struct jul_event, node); | |
637 | ||
638 | error: | |
639 | DBG3("JUL NOT found by name %s in domain.", name); | |
640 | return NULL; | |
641 | } | |
642 | ||
643 | /* | |
644 | * Delete JUL event from given domain. Events hash table MUST be initialized. | |
645 | */ | |
646 | void jul_delete_event(struct jul_event *event, struct jul_domain *dom) | |
647 | { | |
648 | int ret; | |
649 | struct lttng_ht_iter iter; | |
650 | ||
651 | assert(event); | |
652 | assert(dom); | |
653 | assert(dom->events); | |
654 | ||
655 | DBG3("JUL deleting event %s from domain", event->name); | |
656 | ||
657 | iter.iter.node = &event->node.node; | |
658 | rcu_read_lock(); | |
659 | ret = lttng_ht_del(dom->events, &iter); | |
660 | rcu_read_unlock(); | |
661 | assert(!ret); | |
662 | } | |
663 | ||
664 | /* | |
665 | * Free given JUl event. After this call, the pointer is not usable anymore. | |
666 | */ | |
667 | void jul_destroy_event(struct jul_event *event) | |
668 | { | |
669 | assert(event); | |
670 | ||
671 | free(event); | |
672 | } | |
673 | ||
674 | /* | |
675 | * Destroy a JUL domain completely. Note that the given pointer is NOT freed | |
676 | * thus a reference can be passed to this function. | |
677 | */ | |
678 | void jul_destroy_domain(struct jul_domain *dom) | |
679 | { | |
680 | struct lttng_ht_node_str *node; | |
681 | struct lttng_ht_iter iter; | |
682 | ||
683 | assert(dom); | |
684 | ||
685 | DBG3("JUL destroy domain"); | |
686 | ||
687 | /* | |
688 | * Just ignore if no events hash table exists. This is possible if for | |
689 | * instance a JUL domain object was allocated but not initialized. | |
690 | */ | |
691 | if (!dom->events) { | |
692 | return; | |
693 | } | |
694 | ||
695 | rcu_read_lock(); | |
696 | cds_lfht_for_each_entry(dom->events->ht, &iter.iter, node, node) { | |
697 | int ret; | |
698 | ||
699 | ret = lttng_ht_del(dom->events, &iter); | |
700 | assert(!ret); | |
701 | call_rcu(&node->head, destroy_event_jul_rcu); | |
702 | } | |
703 | rcu_read_unlock(); | |
704 | ||
f20baf8e DG |
705 | lttng_ht_destroy(dom->events); |
706 | } | |
707 | ||
708 | /* | |
709 | * Initialize JUL subsystem. | |
710 | */ | |
711 | int jul_init(void) | |
712 | { | |
713 | jul_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
714 | if (!jul_apps_ht_by_sock) { | |
715 | return -1; | |
716 | } | |
717 | ||
718 | return 0; | |
719 | } | |
720 | ||
721 | /* | |
722 | * Update a JUL application (given socket) using the given domain. | |
723 | * | |
724 | * Note that this function is most likely to be used with a tracing session | |
725 | * thus the caller should make sure to hold the appropriate lock(s). | |
726 | */ | |
727 | void jul_update(struct jul_domain *domain, int sock) | |
728 | { | |
729 | int ret; | |
730 | struct jul_app *app; | |
731 | struct jul_event *event; | |
732 | struct lttng_ht_iter iter; | |
733 | ||
734 | assert(domain); | |
735 | assert(sock >= 0); | |
736 | ||
737 | DBG("JUL updating app socket %d", sock); | |
738 | ||
739 | rcu_read_lock(); | |
740 | cds_lfht_for_each_entry(domain->events->ht, &iter.iter, event, node.node) { | |
741 | /* Skip event if disabled. */ | |
742 | if (!event->enabled) { | |
743 | continue; | |
744 | } | |
745 | ||
746 | app = jul_find_app_by_sock(sock); | |
747 | /* | |
748 | * We are in the registration path thus if the application is gone, | |
749 | * there is a serious code flow error. | |
750 | */ | |
751 | assert(app); | |
752 | ||
753 | ret = enable_event(app, event); | |
754 | if (ret != LTTNG_OK) { | |
755 | DBG2("JUL update unable to enable event %s on app pid: %d sock %d", | |
756 | event->name, app->pid, app->sock->fd); | |
757 | /* Let's try the others here and don't assume the app is dead. */ | |
758 | continue; | |
759 | } | |
760 | } | |
761 | rcu_read_unlock(); | |
0475c50c | 762 | } |