Commit | Line | Data |
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d3e2ba59 JD |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <getopt.h> | |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/mman.h> | |
29 | #include <sys/mount.h> | |
30 | #include <sys/resource.h> | |
31 | #include <sys/socket.h> | |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
34 | #include <sys/wait.h> | |
35 | #include <inttypes.h> | |
36 | #include <urcu/futex.h> | |
37 | #include <urcu/uatomic.h> | |
38 | #include <unistd.h> | |
39 | #include <fcntl.h> | |
40 | #include <config.h> | |
41 | ||
42 | #include <lttng/lttng.h> | |
43 | #include <common/common.h> | |
44 | #include <common/compat/poll.h> | |
45 | #include <common/compat/socket.h> | |
46 | #include <common/defaults.h> | |
47 | #include <common/futex.h> | |
48 | #include <common/sessiond-comm/sessiond-comm.h> | |
49 | #include <common/sessiond-comm/inet.h> | |
50 | #include <common/sessiond-comm/relayd.h> | |
51 | #include <common/uri.h> | |
52 | #include <common/utils.h> | |
53 | ||
54 | #include "cmd.h" | |
55 | #include "live.h" | |
56 | #include "lttng-relayd.h" | |
57 | #include "lttng-viewer.h" | |
58 | #include "utils.h" | |
eea7556c | 59 | #include "health-relayd.h" |
d3e2ba59 JD |
60 | |
61 | static struct lttng_uri *live_uri; | |
62 | ||
63 | /* | |
64 | * Quit pipe for all threads. This permits a single cancellation point | |
65 | * for all threads when receiving an event on the pipe. | |
66 | */ | |
67 | static int live_thread_quit_pipe[2] = { -1, -1 }; | |
68 | ||
69 | /* | |
70 | * This pipe is used to inform the worker thread that a command is queued and | |
71 | * ready to be processed. | |
72 | */ | |
73 | static int live_relay_cmd_pipe[2] = { -1, -1 }; | |
74 | ||
75 | /* Shared between threads */ | |
76 | static int live_dispatch_thread_exit; | |
77 | ||
78 | static pthread_t live_listener_thread; | |
79 | static pthread_t live_dispatcher_thread; | |
80 | static pthread_t live_worker_thread; | |
81 | ||
82 | /* | |
83 | * Relay command queue. | |
84 | * | |
85 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
86 | * queue. | |
87 | */ | |
88 | static struct relay_cmd_queue viewer_cmd_queue; | |
89 | ||
90 | static uint64_t last_relay_viewer_session_id; | |
91 | ||
92 | /* | |
93 | * Cleanup the daemon | |
94 | */ | |
95 | static | |
96 | void cleanup(void) | |
97 | { | |
98 | DBG("Cleaning up"); | |
99 | ||
d3e2ba59 JD |
100 | free(live_uri); |
101 | } | |
102 | ||
103 | /* | |
104 | * Write to writable pipe used to notify a thread. | |
105 | */ | |
106 | static | |
107 | int notify_thread_pipe(int wpipe) | |
108 | { | |
109 | int ret; | |
110 | ||
111 | do { | |
112 | ret = write(wpipe, "!", 1); | |
113 | } while (ret < 0 && errno == EINTR); | |
114 | if (ret < 0 || ret != 1) { | |
115 | PERROR("write poll pipe"); | |
116 | } | |
117 | ||
118 | return ret; | |
119 | } | |
120 | ||
121 | /* | |
122 | * Stop all threads by closing the thread quit pipe. | |
123 | */ | |
124 | static | |
125 | void stop_threads(void) | |
126 | { | |
127 | int ret; | |
128 | ||
129 | /* Stopping all threads */ | |
130 | DBG("Terminating all live threads"); | |
131 | ret = notify_thread_pipe(live_thread_quit_pipe[1]); | |
132 | if (ret < 0) { | |
133 | ERR("write error on thread quit pipe"); | |
134 | } | |
135 | ||
136 | /* Dispatch thread */ | |
137 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); | |
138 | futex_nto1_wake(&viewer_cmd_queue.futex); | |
139 | } | |
140 | ||
d3e2ba59 JD |
141 | /* |
142 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
143 | */ | |
144 | static | |
145 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
146 | { | |
147 | int ret; | |
148 | ||
149 | if (events == NULL || size == 0) { | |
150 | ret = -1; | |
151 | goto error; | |
152 | } | |
153 | ||
154 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
155 | if (ret < 0) { | |
156 | goto error; | |
157 | } | |
158 | ||
159 | /* Add quit pipe */ | |
160 | ret = lttng_poll_add(events, live_thread_quit_pipe[0], LPOLLIN); | |
161 | if (ret < 0) { | |
162 | goto error; | |
163 | } | |
164 | ||
165 | return 0; | |
166 | ||
167 | error: | |
168 | return ret; | |
169 | } | |
170 | ||
171 | /* | |
172 | * Check if the thread quit pipe was triggered. | |
173 | * | |
174 | * Return 1 if it was triggered else 0; | |
175 | */ | |
176 | static | |
177 | int check_thread_quit_pipe(int fd, uint32_t events) | |
178 | { | |
179 | if (fd == live_thread_quit_pipe[0] && (events & LPOLLIN)) { | |
180 | return 1; | |
181 | } | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | /* | |
187 | * Create and init socket from uri. | |
188 | */ | |
189 | static | |
190 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
191 | { | |
192 | int ret; | |
193 | struct lttcomm_sock *sock = NULL; | |
194 | ||
195 | sock = lttcomm_alloc_sock_from_uri(uri); | |
196 | if (sock == NULL) { | |
197 | ERR("Allocating socket"); | |
198 | goto error; | |
199 | } | |
200 | ||
201 | ret = lttcomm_create_sock(sock); | |
202 | if (ret < 0) { | |
203 | goto error; | |
204 | } | |
205 | DBG("Listening on sock %d for live", sock->fd); | |
206 | ||
207 | ret = sock->ops->bind(sock); | |
208 | if (ret < 0) { | |
209 | goto error; | |
210 | } | |
211 | ||
212 | ret = sock->ops->listen(sock, -1); | |
213 | if (ret < 0) { | |
214 | goto error; | |
215 | ||
216 | } | |
217 | ||
218 | return sock; | |
219 | ||
220 | error: | |
221 | if (sock) { | |
222 | lttcomm_destroy_sock(sock); | |
223 | } | |
224 | return NULL; | |
225 | } | |
226 | ||
227 | /* | |
228 | * This thread manages the listening for new connections on the network | |
229 | */ | |
230 | static | |
231 | void *thread_listener(void *data) | |
232 | { | |
233 | int i, ret, pollfd, err = -1; | |
234 | int val = 1; | |
235 | uint32_t revents, nb_fd; | |
236 | struct lttng_poll_event events; | |
237 | struct lttcomm_sock *live_control_sock; | |
238 | ||
239 | DBG("[thread] Relay live listener started"); | |
240 | ||
eea7556c MD |
241 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
242 | ||
243 | health_code_update(); | |
244 | ||
d3e2ba59 JD |
245 | live_control_sock = init_socket(live_uri); |
246 | if (!live_control_sock) { | |
247 | goto error_sock_control; | |
248 | } | |
249 | ||
250 | /* | |
251 | * Pass 3 as size here for the thread quit pipe, control and data socket. | |
252 | */ | |
253 | ret = create_thread_poll_set(&events, 2); | |
254 | if (ret < 0) { | |
255 | goto error_create_poll; | |
256 | } | |
257 | ||
258 | /* Add the control socket */ | |
259 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
260 | if (ret < 0) { | |
261 | goto error_poll_add; | |
262 | } | |
263 | ||
264 | while (1) { | |
eea7556c MD |
265 | health_code_update(); |
266 | ||
d3e2ba59 JD |
267 | DBG("Listener accepting live viewers connections"); |
268 | ||
269 | restart: | |
eea7556c | 270 | health_poll_entry(); |
d3e2ba59 | 271 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 272 | health_poll_exit(); |
d3e2ba59 JD |
273 | if (ret < 0) { |
274 | /* | |
275 | * Restart interrupted system call. | |
276 | */ | |
277 | if (errno == EINTR) { | |
278 | goto restart; | |
279 | } | |
280 | goto error; | |
281 | } | |
282 | nb_fd = ret; | |
283 | ||
284 | DBG("Relay new viewer connection received"); | |
285 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
286 | health_code_update(); |
287 | ||
d3e2ba59 JD |
288 | /* Fetch once the poll data */ |
289 | revents = LTTNG_POLL_GETEV(&events, i); | |
290 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
291 | ||
292 | /* Thread quit pipe has been closed. Killing thread. */ | |
293 | ret = check_thread_quit_pipe(pollfd, revents); | |
294 | if (ret) { | |
295 | err = 0; | |
296 | goto exit; | |
297 | } | |
298 | ||
299 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
300 | ERR("socket poll error"); | |
301 | goto error; | |
302 | } else if (revents & LPOLLIN) { | |
303 | /* | |
304 | * Get allocated in this thread, enqueued to a global queue, | |
305 | * dequeued and freed in the worker thread. | |
306 | */ | |
307 | struct relay_command *relay_cmd; | |
308 | struct lttcomm_sock *newsock; | |
309 | ||
310 | relay_cmd = zmalloc(sizeof(*relay_cmd)); | |
311 | if (!relay_cmd) { | |
312 | PERROR("relay command zmalloc"); | |
313 | goto error; | |
314 | } | |
315 | ||
316 | assert(pollfd == live_control_sock->fd); | |
317 | newsock = live_control_sock->ops->accept(live_control_sock); | |
318 | if (!newsock) { | |
319 | PERROR("accepting control sock"); | |
320 | free(relay_cmd); | |
321 | goto error; | |
322 | } | |
323 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
324 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, | |
325 | sizeof(int)); | |
326 | if (ret < 0) { | |
327 | PERROR("setsockopt inet"); | |
328 | lttcomm_destroy_sock(newsock); | |
329 | free(relay_cmd); | |
330 | goto error; | |
331 | } | |
332 | relay_cmd->sock = newsock; | |
333 | ||
334 | /* | |
335 | * Lock free enqueue the request. | |
336 | */ | |
337 | cds_wfq_enqueue(&viewer_cmd_queue.queue, &relay_cmd->node); | |
338 | ||
339 | /* | |
340 | * Wake the dispatch queue futex. Implicit memory | |
341 | * barrier with the exchange in cds_wfq_enqueue. | |
342 | */ | |
343 | futex_nto1_wake(&viewer_cmd_queue.futex); | |
344 | } | |
345 | } | |
346 | } | |
347 | ||
348 | exit: | |
349 | error: | |
350 | error_poll_add: | |
351 | lttng_poll_clean(&events); | |
352 | error_create_poll: | |
353 | if (live_control_sock->fd >= 0) { | |
354 | ret = live_control_sock->ops->close(live_control_sock); | |
355 | if (ret) { | |
356 | PERROR("close"); | |
357 | } | |
358 | } | |
359 | lttcomm_destroy_sock(live_control_sock); | |
360 | error_sock_control: | |
361 | if (err) { | |
eea7556c | 362 | health_error(); |
d3e2ba59 JD |
363 | DBG("Live viewer listener thread exited with error"); |
364 | } | |
eea7556c | 365 | health_unregister(health_relayd); |
d3e2ba59 JD |
366 | DBG("Live viewer listener thread cleanup complete"); |
367 | stop_threads(); | |
368 | return NULL; | |
369 | } | |
370 | ||
371 | /* | |
372 | * This thread manages the dispatching of the requests to worker threads | |
373 | */ | |
374 | static | |
375 | void *thread_dispatcher(void *data) | |
376 | { | |
eea7556c | 377 | int ret, err = -1; |
d3e2ba59 JD |
378 | struct cds_wfq_node *node; |
379 | struct relay_command *relay_cmd = NULL; | |
380 | ||
381 | DBG("[thread] Live viewer relay dispatcher started"); | |
382 | ||
eea7556c MD |
383 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
384 | ||
385 | health_code_update(); | |
386 | ||
d3e2ba59 | 387 | while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
eea7556c MD |
388 | health_code_update(); |
389 | ||
d3e2ba59 JD |
390 | /* Atomically prepare the queue futex */ |
391 | futex_nto1_prepare(&viewer_cmd_queue.futex); | |
392 | ||
393 | do { | |
eea7556c MD |
394 | health_code_update(); |
395 | ||
d3e2ba59 JD |
396 | /* Dequeue commands */ |
397 | node = cds_wfq_dequeue_blocking(&viewer_cmd_queue.queue); | |
398 | if (node == NULL) { | |
399 | DBG("Woken up but nothing in the live-viewer " | |
400 | "relay command queue"); | |
401 | /* Continue thread execution */ | |
402 | break; | |
403 | } | |
404 | ||
405 | relay_cmd = caa_container_of(node, struct relay_command, node); | |
406 | DBG("Dispatching viewer request waiting on sock %d", | |
407 | relay_cmd->sock->fd); | |
408 | ||
409 | /* | |
410 | * Inform worker thread of the new request. This call is blocking | |
411 | * so we can be assured that the data will be read at some point in | |
412 | * time or wait to the end of the world :) | |
413 | */ | |
414 | do { | |
415 | ret = write(live_relay_cmd_pipe[1], relay_cmd, | |
416 | sizeof(*relay_cmd)); | |
417 | } while (ret < 0 && errno == EINTR); | |
418 | free(relay_cmd); | |
419 | if (ret < 0 || ret != sizeof(struct relay_command)) { | |
420 | PERROR("write cmd pipe"); | |
421 | goto error; | |
422 | } | |
423 | } while (node != NULL); | |
424 | ||
425 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 426 | health_poll_entry(); |
d3e2ba59 | 427 | futex_nto1_wait(&viewer_cmd_queue.futex); |
eea7556c | 428 | health_poll_exit(); |
d3e2ba59 JD |
429 | } |
430 | ||
eea7556c MD |
431 | /* Normal exit, no error */ |
432 | err = 0; | |
433 | ||
d3e2ba59 | 434 | error: |
eea7556c MD |
435 | if (err) { |
436 | health_error(); | |
437 | ERR("Health error occurred in %s", __func__); | |
438 | } | |
439 | health_unregister(health_relayd); | |
d3e2ba59 JD |
440 | DBG("Live viewer dispatch thread dying"); |
441 | stop_threads(); | |
442 | return NULL; | |
443 | } | |
444 | ||
445 | /* | |
446 | * Establish connection with the viewer and check the versions. | |
447 | * | |
448 | * Return 0 on success or else negative value. | |
449 | */ | |
450 | static | |
451 | int viewer_connect(struct relay_command *cmd) | |
452 | { | |
453 | int ret; | |
454 | struct lttng_viewer_connect reply, msg; | |
455 | ||
456 | assert(cmd); | |
457 | ||
458 | cmd->version_check_done = 1; | |
459 | ||
eea7556c MD |
460 | health_code_update(); |
461 | ||
d3e2ba59 JD |
462 | /* Get version from the other side. */ |
463 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); | |
464 | if (ret < 0 || ret != sizeof(msg)) { | |
465 | if (ret == 0) { | |
466 | /* Orderly shutdown. Not necessary to print an error. */ | |
467 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
468 | } else { | |
469 | ERR("Relay failed to receive the version values."); | |
470 | } | |
471 | ret = -1; | |
472 | goto end; | |
473 | } | |
474 | ||
eea7556c MD |
475 | health_code_update(); |
476 | ||
d3e2ba59 JD |
477 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
478 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
479 | ||
480 | /* Major versions must be the same */ | |
481 | if (reply.major != be32toh(msg.major)) { | |
482 | DBG("Incompatible major versions (%u vs %u)", reply.major, | |
483 | be32toh(msg.major)); | |
484 | ret = 0; | |
485 | goto end; | |
486 | } | |
487 | ||
488 | cmd->major = reply.major; | |
489 | /* We adapt to the lowest compatible version */ | |
490 | if (reply.minor <= be32toh(msg.minor)) { | |
491 | cmd->minor = reply.minor; | |
492 | } else { | |
493 | cmd->minor = be32toh(msg.minor); | |
494 | } | |
495 | ||
496 | if (be32toh(msg.type) == VIEWER_CLIENT_COMMAND) { | |
497 | cmd->type = RELAY_VIEWER_COMMAND; | |
498 | } else if (be32toh(msg.type) == VIEWER_CLIENT_NOTIFICATION) { | |
499 | cmd->type = RELAY_VIEWER_NOTIFICATION; | |
500 | } else { | |
501 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
502 | ret = -1; | |
503 | goto end; | |
504 | } | |
505 | ||
506 | reply.major = htobe32(reply.major); | |
507 | reply.minor = htobe32(reply.minor); | |
508 | if (cmd->type == RELAY_VIEWER_COMMAND) { | |
509 | reply.viewer_session_id = htobe64(++last_relay_viewer_session_id); | |
510 | } | |
eea7556c MD |
511 | |
512 | health_code_update(); | |
513 | ||
d3e2ba59 JD |
514 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
515 | sizeof(struct lttng_viewer_connect), 0); | |
516 | if (ret < 0) { | |
517 | ERR("Relay sending version"); | |
518 | } | |
519 | ||
eea7556c MD |
520 | health_code_update(); |
521 | ||
d3e2ba59 JD |
522 | DBG("Version check done using protocol %u.%u", cmd->major, cmd->minor); |
523 | ret = 0; | |
524 | ||
525 | end: | |
526 | return ret; | |
527 | } | |
528 | ||
529 | /* | |
530 | * Send the viewer the list of current sessions. | |
531 | * | |
532 | * Return 0 on success or else a negative value. | |
533 | */ | |
534 | static | |
535 | int viewer_list_sessions(struct relay_command *cmd, | |
536 | struct lttng_ht *sessions_ht) | |
537 | { | |
538 | int ret; | |
539 | struct lttng_viewer_list_sessions session_list; | |
540 | unsigned long count; | |
541 | long approx_before, approx_after; | |
542 | struct lttng_ht_node_ulong *node; | |
543 | struct lttng_ht_iter iter; | |
544 | struct lttng_viewer_session send_session; | |
545 | struct relay_session *session; | |
546 | ||
547 | DBG("List sessions received"); | |
548 | ||
549 | if (cmd->version_check_done == 0) { | |
550 | ERR("Trying to list sessions before version check"); | |
551 | ret = -1; | |
552 | goto end_no_session; | |
553 | } | |
554 | ||
555 | rcu_read_lock(); | |
556 | cds_lfht_count_nodes(sessions_ht->ht, &approx_before, &count, &approx_after); | |
557 | session_list.sessions_count = htobe32(count); | |
558 | ||
eea7556c MD |
559 | health_code_update(); |
560 | ||
d3e2ba59 JD |
561 | ret = cmd->sock->ops->sendmsg(cmd->sock, &session_list, |
562 | sizeof(session_list), 0); | |
563 | if (ret < 0) { | |
564 | ERR("Relay sending sessions list"); | |
565 | goto end_unlock; | |
566 | } | |
567 | ||
eea7556c MD |
568 | health_code_update(); |
569 | ||
d3e2ba59 | 570 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, node, node) { |
eea7556c MD |
571 | health_code_update(); |
572 | ||
d3e2ba59 JD |
573 | node = lttng_ht_iter_get_node_ulong(&iter); |
574 | if (!node) { | |
575 | goto end_unlock; | |
576 | } | |
577 | session = caa_container_of(node, struct relay_session, session_n); | |
578 | ||
579 | strncpy(send_session.session_name, session->session_name, | |
580 | sizeof(send_session.session_name)); | |
581 | strncpy(send_session.hostname, session->hostname, | |
582 | sizeof(send_session.hostname)); | |
583 | send_session.id = htobe64(session->id); | |
584 | send_session.live_timer = htobe32(session->live_timer); | |
585 | send_session.clients = htobe32(session->viewer_attached); | |
87b576ec | 586 | send_session.streams = htobe32(session->stream_count); |
d3e2ba59 | 587 | |
eea7556c MD |
588 | health_code_update(); |
589 | ||
d3e2ba59 JD |
590 | ret = cmd->sock->ops->sendmsg(cmd->sock, &send_session, |
591 | sizeof(send_session), 0); | |
592 | if (ret < 0) { | |
593 | ERR("Relay sending session info"); | |
594 | goto end_unlock; | |
595 | } | |
596 | } | |
eea7556c MD |
597 | health_code_update(); |
598 | ||
d3e2ba59 JD |
599 | rcu_read_unlock(); |
600 | ret = 0; | |
601 | goto end; | |
602 | ||
603 | end_unlock: | |
604 | rcu_read_unlock(); | |
605 | ||
606 | end: | |
607 | end_no_session: | |
608 | return ret; | |
609 | } | |
610 | ||
0e6830aa JD |
611 | /* |
612 | * Open index file using a given viewer stream. | |
613 | * | |
614 | * Return 0 on success or else a negative value. | |
615 | */ | |
616 | static int open_index(struct relay_viewer_stream *stream) | |
617 | { | |
618 | int ret; | |
619 | char fullpath[PATH_MAX]; | |
620 | struct lttng_packet_index_file_hdr hdr; | |
621 | ||
622 | if (stream->tracefile_size > 0) { | |
623 | /* For now we don't support on-disk ring buffer. */ | |
624 | ret = -1; | |
625 | goto end; | |
626 | } | |
627 | ||
628 | ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR "/%s" | |
629 | DEFAULT_INDEX_FILE_SUFFIX, stream->path_name, | |
630 | stream->channel_name); | |
631 | if (ret < 0) { | |
632 | PERROR("snprintf index path"); | |
633 | goto error; | |
634 | } | |
635 | ||
636 | DBG("Opening index file %s in read only", fullpath); | |
637 | ret = open(fullpath, O_RDONLY); | |
638 | if (ret < 0) { | |
639 | if (errno == ENOENT) { | |
640 | ret = -ENOENT; | |
641 | goto error; | |
642 | } else { | |
643 | PERROR("opening index in read-only"); | |
644 | } | |
645 | goto error; | |
646 | } | |
647 | stream->index_read_fd = ret; | |
648 | DBG("Opening index file %s in read only, (fd: %d)", fullpath, ret); | |
649 | ||
650 | do { | |
651 | health_code_update(); | |
652 | ret = read(stream->index_read_fd, &hdr, sizeof(hdr)); | |
653 | } while (ret < 0 && errno == EINTR); | |
654 | if (ret < 0) { | |
655 | PERROR("Reading index header"); | |
656 | goto error; | |
657 | } | |
658 | if (strncmp(hdr.magic, INDEX_MAGIC, sizeof(hdr.magic)) != 0) { | |
659 | ERR("Invalid header magic"); | |
660 | ret = -1; | |
661 | goto error; | |
662 | } | |
663 | if (be32toh(hdr.index_major) != INDEX_MAJOR || | |
664 | be32toh(hdr.index_minor) != INDEX_MINOR) { | |
665 | ERR("Invalid header version"); | |
666 | ret = -1; | |
667 | goto error; | |
668 | } | |
669 | ret = 0; | |
670 | ||
671 | error: | |
672 | end: | |
673 | return ret; | |
674 | } | |
675 | ||
d3e2ba59 JD |
676 | /* |
677 | * Allocate and init a new viewer_stream. | |
678 | * | |
679 | * Copies the values from the stream passed in parameter and insert the new | |
680 | * stream in the viewer_streams_ht. | |
681 | * | |
682 | * MUST be called with rcu_read_lock held. | |
683 | * | |
684 | * Returns 0 on success or a negative value on error. | |
685 | */ | |
686 | static | |
0e6830aa | 687 | int init_viewer_stream(struct relay_stream *stream, int seek_last) |
d3e2ba59 JD |
688 | { |
689 | int ret; | |
690 | struct relay_viewer_stream *viewer_stream; | |
691 | ||
692 | assert(stream); | |
d3e2ba59 JD |
693 | |
694 | viewer_stream = zmalloc(sizeof(*viewer_stream)); | |
695 | if (!viewer_stream) { | |
696 | PERROR("relay viewer stream zmalloc"); | |
697 | ret = -1; | |
698 | goto error; | |
699 | } | |
700 | ||
701 | viewer_stream->read_fd = -1; | |
702 | viewer_stream->index_read_fd = -1; | |
703 | viewer_stream->session_id = stream->session->id; | |
704 | viewer_stream->stream_handle = stream->stream_handle; | |
705 | viewer_stream->path_name = strndup(stream->path_name, | |
706 | LTTNG_VIEWER_PATH_MAX); | |
707 | viewer_stream->channel_name = strndup(stream->channel_name, | |
708 | LTTNG_VIEWER_NAME_MAX); | |
709 | viewer_stream->total_index_received = stream->total_index_received; | |
710 | viewer_stream->tracefile_size = stream->tracefile_size; | |
711 | viewer_stream->tracefile_count = stream->tracefile_count; | |
712 | viewer_stream->metadata_flag = stream->metadata_flag; | |
713 | ||
0e6830aa JD |
714 | if (seek_last && viewer_stream->total_index_received > 0) { |
715 | ret = open_index(viewer_stream); | |
716 | if (ret < 0) { | |
717 | goto error; | |
718 | } | |
719 | ret = lseek(viewer_stream->index_read_fd, | |
720 | viewer_stream->total_index_received * | |
721 | sizeof(struct lttng_packet_index), | |
722 | SEEK_CUR); | |
723 | if (ret < 0) { | |
724 | goto error; | |
725 | } | |
726 | viewer_stream->last_sent_index = | |
727 | viewer_stream->total_index_received; | |
728 | } | |
729 | ||
d3e2ba59 JD |
730 | /* |
731 | * This is to avoid a race between the initialization of this object and | |
732 | * the close of the given stream. If the stream is unable to find this | |
733 | * viewer stream when closing, this copy will at least take the latest | |
734 | * value. | |
735 | */ | |
736 | viewer_stream->total_index_received = stream->total_index_received; | |
737 | ||
738 | /* | |
739 | * The deletion of this ctf_trace object is only done in a call RCU of the | |
740 | * relay stream making it valid as long as we have the read side lock. | |
741 | */ | |
742 | viewer_stream->ctf_trace = stream->ctf_trace; | |
743 | uatomic_inc(&viewer_stream->ctf_trace->refcount); | |
744 | ||
745 | lttng_ht_node_init_u64(&viewer_stream->stream_n, stream->stream_handle); | |
746 | lttng_ht_add_unique_u64(viewer_streams_ht, &viewer_stream->stream_n); | |
747 | ||
748 | ret = 0; | |
749 | ||
750 | error: | |
751 | return ret; | |
752 | } | |
753 | ||
754 | /* | |
755 | * Send the viewer the list of current sessions. | |
756 | */ | |
757 | static | |
758 | int viewer_attach_session(struct relay_command *cmd, | |
92c6ca54 | 759 | struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
760 | { |
761 | int ret, send_streams = 0, nb_streams = 0; | |
762 | struct lttng_viewer_attach_session_request request; | |
763 | struct lttng_viewer_attach_session_response response; | |
764 | struct lttng_viewer_stream send_stream; | |
765 | struct relay_stream *stream; | |
766 | struct relay_viewer_stream *viewer_stream; | |
767 | struct lttng_ht_node_ulong *node; | |
768 | struct lttng_ht_node_u64 *node64; | |
769 | struct lttng_ht_iter iter; | |
770 | struct relay_session *session; | |
0e6830aa | 771 | int seek_last = 0; |
d3e2ba59 JD |
772 | |
773 | assert(cmd); | |
774 | assert(sessions_ht); | |
d3e2ba59 JD |
775 | |
776 | DBG("Attach session received"); | |
777 | ||
778 | if (cmd->version_check_done == 0) { | |
779 | ERR("Trying to attach session before version check"); | |
780 | ret = -1; | |
781 | goto end_no_session; | |
782 | } | |
783 | ||
eea7556c MD |
784 | health_code_update(); |
785 | ||
d3e2ba59 JD |
786 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request, sizeof(request), 0); |
787 | if (ret < 0 || ret != sizeof(request)) { | |
788 | if (ret == 0) { | |
789 | /* Orderly shutdown. Not necessary to print an error. */ | |
790 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
791 | } else { | |
792 | ERR("Relay failed to receive the attach parameters."); | |
793 | } | |
794 | ret = -1; | |
795 | goto error; | |
796 | } | |
797 | ||
eea7556c MD |
798 | health_code_update(); |
799 | ||
d3e2ba59 JD |
800 | rcu_read_lock(); |
801 | lttng_ht_lookup(sessions_ht, | |
802 | (void *)((unsigned long) be64toh(request.session_id)), &iter); | |
803 | node = lttng_ht_iter_get_node_ulong(&iter); | |
804 | if (node == NULL) { | |
805 | DBG("Relay session %" PRIu64 " not found", | |
806 | be64toh(request.session_id)); | |
807 | response.status = htobe32(VIEWER_ATTACH_UNK); | |
808 | goto send_reply; | |
809 | } | |
810 | ||
811 | session = caa_container_of(node, struct relay_session, session_n); | |
b92fdc2b | 812 | if (cmd->session_id == session->id) { |
d3e2ba59 JD |
813 | /* Same viewer already attached, just send the stream list. */ |
814 | send_streams = 1; | |
815 | response.status = htobe32(VIEWER_ATTACH_OK); | |
816 | } else if (session->viewer_attached != 0) { | |
817 | DBG("Already a viewer attached"); | |
818 | response.status = htobe32(VIEWER_ATTACH_ALREADY); | |
819 | goto send_reply; | |
820 | } else if (session->live_timer == 0) { | |
821 | DBG("Not live session"); | |
822 | response.status = htobe32(VIEWER_ATTACH_NOT_LIVE); | |
823 | goto send_reply; | |
824 | } else { | |
825 | session->viewer_attached++; | |
826 | send_streams = 1; | |
827 | response.status = htobe32(VIEWER_ATTACH_OK); | |
b92fdc2b | 828 | cmd->session_id = session->id; |
d3e2ba59 JD |
829 | cmd->session = session; |
830 | } | |
831 | ||
832 | switch (be32toh(request.seek)) { | |
833 | case VIEWER_SEEK_BEGINNING: | |
834 | /* Default behaviour. */ | |
835 | break; | |
836 | case VIEWER_SEEK_LAST: | |
0e6830aa | 837 | seek_last = 1; |
d3e2ba59 JD |
838 | break; |
839 | default: | |
840 | ERR("Wrong seek parameter"); | |
841 | response.status = htobe32(VIEWER_ATTACH_SEEK_ERR); | |
842 | send_streams = 0; | |
843 | goto send_reply; | |
844 | } | |
845 | ||
846 | if (send_streams) { | |
847 | /* We should only be there if we have a session to attach to. */ | |
848 | assert(session); | |
849 | ||
850 | /* | |
851 | * Fill the viewer_streams_ht to count the number of streams | |
852 | * ready to be sent and avoid concurrency issues on the | |
853 | * relay_streams_ht and don't rely on a total session stream count. | |
854 | */ | |
855 | cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, node, node) { | |
856 | struct relay_viewer_stream *vstream; | |
857 | ||
eea7556c MD |
858 | health_code_update(); |
859 | ||
d3e2ba59 JD |
860 | node = lttng_ht_iter_get_node_ulong(&iter); |
861 | if (!node) { | |
862 | continue; | |
863 | } | |
864 | stream = caa_container_of(node, struct relay_stream, stream_n); | |
865 | if (stream->session != cmd->session) { | |
866 | continue; | |
867 | } | |
868 | ||
869 | /* | |
870 | * Don't send streams with no ctf_trace, they are not ready to be | |
871 | * read. | |
872 | */ | |
873 | if (!stream->ctf_trace) { | |
874 | continue; | |
875 | } | |
876 | ||
92c6ca54 | 877 | vstream = live_find_viewer_stream_by_id(stream->stream_handle); |
d3e2ba59 | 878 | if (!vstream) { |
0e6830aa | 879 | ret = init_viewer_stream(stream, seek_last); |
d3e2ba59 JD |
880 | if (ret < 0) { |
881 | goto end_unlock; | |
882 | } | |
883 | } | |
884 | nb_streams++; | |
885 | } | |
886 | response.streams_count = htobe32(nb_streams); | |
887 | } | |
888 | ||
889 | send_reply: | |
eea7556c | 890 | health_code_update(); |
d3e2ba59 JD |
891 | ret = cmd->sock->ops->sendmsg(cmd->sock, &response, sizeof(response), 0); |
892 | if (ret < 0) { | |
893 | ERR("Relay sending viewer attach response"); | |
894 | goto end_unlock; | |
895 | } | |
eea7556c | 896 | health_code_update(); |
d3e2ba59 JD |
897 | |
898 | /* | |
899 | * Unknown or busy session, just return gracefully, the viewer knows what | |
900 | * is happening. | |
901 | */ | |
902 | if (!send_streams) { | |
903 | ret = 0; | |
904 | goto end_unlock; | |
905 | } | |
906 | ||
907 | /* We should only be there if we have a session to attach to. */ | |
908 | assert(session); | |
909 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) { | |
eea7556c MD |
910 | health_code_update(); |
911 | ||
d3e2ba59 JD |
912 | node64 = lttng_ht_iter_get_node_u64(&iter); |
913 | if (!node64) { | |
914 | continue; | |
915 | } | |
916 | viewer_stream = caa_container_of(node64, struct relay_viewer_stream, | |
917 | stream_n); | |
918 | if (viewer_stream->session_id != cmd->session->id) { | |
919 | continue; | |
920 | } | |
921 | ||
922 | send_stream.id = htobe64(viewer_stream->stream_handle); | |
923 | send_stream.ctf_trace_id = htobe64(viewer_stream->ctf_trace->id); | |
924 | send_stream.metadata_flag = htobe32(viewer_stream->metadata_flag); | |
925 | strncpy(send_stream.path_name, viewer_stream->path_name, | |
926 | sizeof(send_stream.path_name)); | |
927 | strncpy(send_stream.channel_name, viewer_stream->channel_name, | |
928 | sizeof(send_stream.channel_name)); | |
929 | ||
930 | ret = cmd->sock->ops->sendmsg(cmd->sock, &send_stream, | |
931 | sizeof(send_stream), 0); | |
932 | if (ret < 0) { | |
933 | ERR("Relay sending stream %" PRIu64, viewer_stream->stream_handle); | |
934 | goto end_unlock; | |
935 | } | |
936 | DBG("Sent stream %" PRIu64 " to viewer", viewer_stream->stream_handle); | |
937 | } | |
938 | ret = 0; | |
939 | ||
940 | end_unlock: | |
941 | rcu_read_unlock(); | |
942 | end_no_session: | |
943 | error: | |
944 | return ret; | |
945 | } | |
946 | ||
d3e2ba59 JD |
947 | /* |
948 | * Get viewer stream from stream id. | |
949 | * | |
950 | * RCU read side lock MUST be acquired. | |
951 | */ | |
92c6ca54 | 952 | struct relay_viewer_stream *live_find_viewer_stream_by_id(uint64_t stream_id) |
d3e2ba59 JD |
953 | { |
954 | struct lttng_ht_node_u64 *node; | |
955 | struct lttng_ht_iter iter; | |
956 | struct relay_viewer_stream *stream = NULL; | |
957 | ||
d3e2ba59 JD |
958 | lttng_ht_lookup(viewer_streams_ht, &stream_id, &iter); |
959 | node = lttng_ht_iter_get_node_u64(&iter); | |
960 | if (node == NULL) { | |
961 | DBG("Relay viewer stream %" PRIu64 " not found", stream_id); | |
962 | goto end; | |
963 | } | |
964 | stream = caa_container_of(node, struct relay_viewer_stream, stream_n); | |
965 | ||
966 | end: | |
967 | return stream; | |
968 | } | |
969 | ||
970 | /* | |
971 | * Send the next index for a stream. | |
972 | * | |
973 | * Return 0 on success or else a negative value. | |
974 | */ | |
975 | static | |
976 | int viewer_get_next_index(struct relay_command *cmd, | |
92c6ca54 | 977 | struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
978 | { |
979 | int ret; | |
980 | struct lttng_viewer_get_next_index request_index; | |
981 | struct lttng_viewer_index viewer_index; | |
982 | struct lttng_packet_index packet_index; | |
983 | struct relay_viewer_stream *vstream; | |
984 | struct relay_stream *rstream; | |
985 | ||
986 | assert(cmd); | |
d3e2ba59 JD |
987 | assert(sessions_ht); |
988 | ||
989 | DBG("Viewer get next index"); | |
990 | ||
991 | if (cmd->version_check_done == 0) { | |
992 | ERR("Trying to request index before version check"); | |
993 | ret = -1; | |
994 | goto end_no_session; | |
995 | } | |
996 | ||
eea7556c | 997 | health_code_update(); |
d3e2ba59 JD |
998 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request_index, |
999 | sizeof(request_index), 0); | |
1000 | if (ret < 0 || ret != sizeof(request_index)) { | |
1001 | ret = -1; | |
1002 | ERR("Relay didn't receive the whole packet"); | |
1003 | goto end; | |
1004 | } | |
eea7556c | 1005 | health_code_update(); |
d3e2ba59 JD |
1006 | |
1007 | rcu_read_lock(); | |
92c6ca54 | 1008 | vstream = live_find_viewer_stream_by_id(be64toh(request_index.stream_id)); |
d3e2ba59 JD |
1009 | if (!vstream) { |
1010 | ret = -1; | |
1011 | goto end_unlock; | |
1012 | } | |
1013 | ||
1014 | memset(&viewer_index, 0, sizeof(viewer_index)); | |
1015 | ||
1016 | /* | |
1017 | * The viewer should not ask for index on metadata stream. | |
1018 | */ | |
1019 | if (vstream->metadata_flag) { | |
1020 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
1021 | goto send_reply; | |
1022 | } | |
1023 | ||
1024 | /* First time, we open the index file */ | |
1025 | if (vstream->index_read_fd < 0) { | |
1026 | ret = open_index(vstream); | |
0e6830aa | 1027 | if (ret == -ENOENT) { |
d3e2ba59 JD |
1028 | /* |
1029 | * The index is created only when the first data packet arrives, it | |
1030 | * might not be ready at the beginning of the session | |
1031 | */ | |
1032 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1033 | goto send_reply; | |
1034 | } else if (ret < 0) { | |
1035 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); | |
1036 | goto send_reply; | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | rstream = relay_stream_find_by_id(vstream->stream_handle); | |
1041 | if (rstream) { | |
1042 | if (rstream->beacon_ts_end != -1ULL && | |
1043 | vstream->last_sent_index == rstream->total_index_received) { | |
1044 | viewer_index.status = htobe32(VIEWER_INDEX_INACTIVE); | |
1045 | viewer_index.timestamp_end = htobe64(rstream->beacon_ts_end); | |
1046 | goto send_reply; | |
1047 | } | |
1048 | ||
1049 | if (rstream->total_index_received <= vstream->last_sent_index) { | |
1050 | /* No new index to send, retry later. */ | |
1051 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
1052 | goto send_reply; | |
1053 | } | |
1054 | } else if (!rstream && | |
1055 | vstream->total_index_received == vstream->last_sent_index) { | |
1056 | /* Last index sent and stream closed */ | |
1057 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
1058 | goto send_reply; | |
1059 | } | |
1060 | ||
1061 | if (!vstream->ctf_trace->metadata_received || | |
1062 | vstream->ctf_trace->metadata_received > | |
1063 | vstream->ctf_trace->metadata_sent) { | |
1064 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1065 | } | |
1066 | ||
1067 | do { | |
eea7556c | 1068 | health_code_update(); |
d3e2ba59 JD |
1069 | ret = read(vstream->index_read_fd, &packet_index, |
1070 | sizeof(packet_index)); | |
1071 | } while (ret < 0 && errno == EINTR); | |
1072 | if (ret < sizeof(packet_index)) { | |
1073 | PERROR("Relay reading index file"); | |
1074 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); | |
1075 | } else { | |
1076 | viewer_index.status = htobe32(VIEWER_INDEX_OK); | |
1077 | vstream->last_sent_index++; | |
1078 | } | |
1079 | ||
1080 | /* | |
1081 | * Indexes are stored in big endian, no need to switch before sending. | |
1082 | */ | |
1083 | viewer_index.offset = packet_index.offset; | |
1084 | viewer_index.packet_size = packet_index.packet_size; | |
1085 | viewer_index.content_size = packet_index.content_size; | |
1086 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1087 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1088 | viewer_index.events_discarded = packet_index.events_discarded; | |
1089 | viewer_index.stream_id = packet_index.stream_id; | |
1090 | ||
1091 | send_reply: | |
1092 | viewer_index.flags = htobe32(viewer_index.flags); | |
eea7556c | 1093 | health_code_update(); |
d3e2ba59 JD |
1094 | ret = cmd->sock->ops->sendmsg(cmd->sock, &viewer_index, |
1095 | sizeof(viewer_index), 0); | |
1096 | if (ret < 0) { | |
1097 | ERR("Relay index to viewer"); | |
1098 | goto end_unlock; | |
1099 | } | |
eea7556c | 1100 | health_code_update(); |
d3e2ba59 JD |
1101 | |
1102 | DBG("Index %" PRIu64 "for stream %" PRIu64 "sent", | |
1103 | vstream->last_sent_index, vstream->stream_handle); | |
1104 | ||
1105 | end_unlock: | |
1106 | rcu_read_unlock(); | |
1107 | ||
1108 | end_no_session: | |
1109 | end: | |
1110 | return ret; | |
1111 | } | |
1112 | ||
1113 | /* | |
1114 | * Send the next index for a stream | |
1115 | * | |
1116 | * Return 0 on success or else a negative value. | |
1117 | */ | |
1118 | static | |
92c6ca54 | 1119 | int viewer_get_packet(struct relay_command *cmd) |
d3e2ba59 JD |
1120 | { |
1121 | int ret, send_data = 0; | |
1122 | char *data = NULL; | |
1123 | uint32_t len = 0; | |
1124 | ssize_t read_len; | |
1125 | struct lttng_viewer_get_packet get_packet_info; | |
1126 | struct lttng_viewer_trace_packet reply; | |
1127 | struct relay_viewer_stream *stream; | |
1128 | ||
1129 | assert(cmd); | |
d3e2ba59 JD |
1130 | |
1131 | DBG2("Relay get data packet"); | |
1132 | ||
1133 | if (cmd->version_check_done == 0) { | |
1134 | ERR("Trying to get packet before version check"); | |
1135 | ret = -1; | |
1136 | goto end; | |
1137 | } | |
1138 | ||
eea7556c | 1139 | health_code_update(); |
d3e2ba59 JD |
1140 | ret = cmd->sock->ops->recvmsg(cmd->sock, &get_packet_info, |
1141 | sizeof(get_packet_info), 0); | |
1142 | if (ret < 0 || ret != sizeof(get_packet_info)) { | |
1143 | ret = -1; | |
1144 | ERR("Relay didn't receive the whole packet"); | |
1145 | goto end; | |
1146 | } | |
eea7556c | 1147 | health_code_update(); |
d3e2ba59 | 1148 | |
0233a6a5 DG |
1149 | /* From this point on, the error label can be reached. */ |
1150 | memset(&reply, 0, sizeof(reply)); | |
1151 | ||
d3e2ba59 | 1152 | rcu_read_lock(); |
92c6ca54 | 1153 | stream = live_find_viewer_stream_by_id(be64toh(get_packet_info.stream_id)); |
d3e2ba59 JD |
1154 | if (!stream) { |
1155 | goto error; | |
1156 | } | |
1157 | assert(stream->ctf_trace); | |
1158 | ||
1159 | /* | |
1160 | * First time we read this stream, we need open the tracefile, we should | |
1161 | * only arrive here if an index has already been sent to the viewer, so the | |
1162 | * tracefile must exist, if it does not it is a fatal error. | |
1163 | */ | |
1164 | if (stream->read_fd < 0) { | |
1165 | char fullpath[PATH_MAX]; | |
1166 | ||
1167 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1168 | stream->channel_name); | |
1169 | if (ret < 0) { | |
1170 | goto error; | |
1171 | } | |
1172 | ret = open(fullpath, O_RDONLY); | |
1173 | if (ret < 0) { | |
1174 | PERROR("Relay opening trace file"); | |
1175 | goto error; | |
1176 | } | |
1177 | stream->read_fd = ret; | |
1178 | } | |
1179 | ||
d3e2ba59 JD |
1180 | if (!stream->ctf_trace->metadata_received || |
1181 | stream->ctf_trace->metadata_received > | |
1182 | stream->ctf_trace->metadata_sent) { | |
1183 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1184 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
d3e2ba59 JD |
1185 | goto send_reply; |
1186 | } | |
1187 | ||
1188 | len = be32toh(get_packet_info.len); | |
1189 | data = zmalloc(len); | |
1190 | if (!data) { | |
1191 | PERROR("relay data zmalloc"); | |
1192 | goto error; | |
1193 | } | |
1194 | ||
1195 | ret = lseek(stream->read_fd, be64toh(get_packet_info.offset), SEEK_SET); | |
1196 | if (ret < 0) { | |
1197 | PERROR("lseek"); | |
1198 | goto error; | |
1199 | } | |
1200 | read_len = read(stream->read_fd, data, len); | |
1201 | if (read_len < (ssize_t) len) { | |
1202 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, | |
1203 | stream->read_fd, be64toh(get_packet_info.offset)); | |
1204 | goto error; | |
1205 | } | |
1206 | reply.status = htobe32(VIEWER_GET_PACKET_OK); | |
1207 | reply.len = htobe32(len); | |
1208 | send_data = 1; | |
1209 | goto send_reply; | |
1210 | ||
1211 | error: | |
1212 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1213 | ||
1214 | send_reply: | |
1215 | reply.flags = htobe32(reply.flags); | |
eea7556c MD |
1216 | |
1217 | health_code_update(); | |
d3e2ba59 JD |
1218 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
1219 | if (ret < 0) { | |
1220 | ERR("Relay data header to viewer"); | |
1221 | goto end_unlock; | |
1222 | } | |
eea7556c | 1223 | health_code_update(); |
d3e2ba59 JD |
1224 | |
1225 | if (send_data) { | |
eea7556c | 1226 | health_code_update(); |
d3e2ba59 JD |
1227 | ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0); |
1228 | if (ret < 0) { | |
1229 | ERR("Relay send data to viewer"); | |
1230 | goto end_unlock; | |
1231 | } | |
eea7556c | 1232 | health_code_update(); |
d3e2ba59 JD |
1233 | } |
1234 | ||
1235 | DBG("Sent %u bytes for stream %" PRIu64, len, | |
1236 | be64toh(get_packet_info.stream_id)); | |
1237 | ||
1238 | end_unlock: | |
1239 | free(data); | |
1240 | rcu_read_unlock(); | |
1241 | ||
1242 | end: | |
1243 | return ret; | |
1244 | } | |
1245 | ||
1246 | /* | |
1247 | * Send the session's metadata | |
1248 | * | |
1249 | * Return 0 on success else a negative value. | |
1250 | */ | |
1251 | static | |
92c6ca54 | 1252 | int viewer_get_metadata(struct relay_command *cmd) |
d3e2ba59 JD |
1253 | { |
1254 | int ret = 0; | |
1255 | ssize_t read_len; | |
1256 | uint64_t len = 0; | |
1257 | char *data = NULL; | |
1258 | struct lttng_viewer_get_metadata request; | |
1259 | struct lttng_viewer_metadata_packet reply; | |
1260 | struct relay_viewer_stream *stream; | |
1261 | ||
1262 | assert(cmd); | |
d3e2ba59 JD |
1263 | |
1264 | DBG("Relay get metadata"); | |
1265 | ||
1266 | if (cmd->version_check_done == 0) { | |
1267 | ERR("Trying to get metadata before version check"); | |
1268 | ret = -1; | |
1269 | goto end; | |
1270 | } | |
1271 | ||
eea7556c | 1272 | health_code_update(); |
d3e2ba59 JD |
1273 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request, |
1274 | sizeof(request), 0); | |
1275 | if (ret < 0 || ret != sizeof(request)) { | |
1276 | ret = -1; | |
1277 | ERR("Relay didn't receive the whole packet"); | |
1278 | goto end; | |
1279 | } | |
eea7556c | 1280 | health_code_update(); |
d3e2ba59 JD |
1281 | |
1282 | rcu_read_lock(); | |
92c6ca54 | 1283 | stream = live_find_viewer_stream_by_id(be64toh(request.stream_id)); |
d3e2ba59 JD |
1284 | if (!stream || !stream->metadata_flag) { |
1285 | ERR("Invalid metadata stream"); | |
1286 | goto error; | |
1287 | } | |
1288 | assert(stream->ctf_trace); | |
1289 | assert(stream->ctf_trace->metadata_sent <= | |
1290 | stream->ctf_trace->metadata_received); | |
1291 | ||
1292 | len = stream->ctf_trace->metadata_received - | |
1293 | stream->ctf_trace->metadata_sent; | |
1294 | if (len == 0) { | |
1295 | reply.status = htobe32(VIEWER_NO_NEW_METADATA); | |
1296 | goto send_reply; | |
1297 | } | |
1298 | ||
1299 | /* first time, we open the metadata file */ | |
1300 | if (stream->read_fd < 0) { | |
1301 | char fullpath[PATH_MAX]; | |
1302 | ||
1303 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1304 | stream->channel_name); | |
1305 | if (ret < 0) { | |
1306 | goto error; | |
1307 | } | |
1308 | ret = open(fullpath, O_RDONLY); | |
1309 | if (ret < 0) { | |
1310 | PERROR("Relay opening metadata file"); | |
1311 | goto error; | |
1312 | } | |
1313 | stream->read_fd = ret; | |
1314 | } | |
1315 | ||
1316 | reply.len = htobe64(len); | |
1317 | data = zmalloc(len); | |
1318 | if (!data) { | |
1319 | PERROR("viewer metadata zmalloc"); | |
1320 | goto error; | |
1321 | } | |
1322 | ||
1323 | read_len = read(stream->read_fd, data, len); | |
1324 | if (read_len < (ssize_t) len) { | |
1325 | PERROR("Relay reading metadata file"); | |
1326 | goto error; | |
1327 | } | |
1328 | stream->ctf_trace->metadata_sent += read_len; | |
1329 | reply.status = htobe32(VIEWER_METADATA_OK); | |
1330 | goto send_reply; | |
1331 | ||
1332 | error: | |
1333 | reply.status = htobe32(VIEWER_METADATA_ERR); | |
1334 | ||
1335 | send_reply: | |
eea7556c | 1336 | health_code_update(); |
d3e2ba59 JD |
1337 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
1338 | if (ret < 0) { | |
1339 | ERR("Relay data header to viewer"); | |
1340 | goto end_unlock; | |
1341 | } | |
eea7556c | 1342 | health_code_update(); |
d3e2ba59 JD |
1343 | |
1344 | if (len > 0) { | |
1345 | ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0); | |
1346 | if (ret < 0) { | |
1347 | ERR("Relay send data to viewer"); | |
1348 | goto end_unlock; | |
1349 | } | |
1350 | } | |
1351 | ||
1352 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
1353 | be64toh(request.stream_id)); | |
1354 | ||
1355 | DBG("Metadata sent"); | |
1356 | ||
1357 | end_unlock: | |
1358 | free(data); | |
1359 | rcu_read_unlock(); | |
1360 | end: | |
1361 | return ret; | |
1362 | } | |
1363 | ||
1364 | /* | |
1365 | * live_relay_unknown_command: send -1 if received unknown command | |
1366 | */ | |
1367 | static | |
1368 | void live_relay_unknown_command(struct relay_command *cmd) | |
1369 | { | |
1370 | struct lttcomm_relayd_generic_reply reply; | |
1371 | int ret; | |
1372 | ||
1373 | reply.ret_code = htobe32(LTTNG_ERR_UNK); | |
1374 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
1375 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
1376 | if (ret < 0) { | |
1377 | ERR("Relay sending unknown command"); | |
1378 | } | |
1379 | } | |
1380 | ||
1381 | /* | |
1382 | * Process the commands received on the control socket | |
1383 | */ | |
1384 | static | |
1385 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
92c6ca54 | 1386 | struct relay_command *cmd, struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
1387 | { |
1388 | int ret = 0; | |
1389 | ||
1390 | switch (be32toh(recv_hdr->cmd)) { | |
1391 | case VIEWER_CONNECT: | |
1392 | ret = viewer_connect(cmd); | |
1393 | break; | |
1394 | case VIEWER_LIST_SESSIONS: | |
1395 | ret = viewer_list_sessions(cmd, sessions_ht); | |
1396 | break; | |
1397 | case VIEWER_ATTACH_SESSION: | |
92c6ca54 | 1398 | ret = viewer_attach_session(cmd, sessions_ht); |
d3e2ba59 JD |
1399 | break; |
1400 | case VIEWER_GET_NEXT_INDEX: | |
92c6ca54 | 1401 | ret = viewer_get_next_index(cmd, sessions_ht); |
d3e2ba59 JD |
1402 | break; |
1403 | case VIEWER_GET_PACKET: | |
92c6ca54 | 1404 | ret = viewer_get_packet(cmd); |
d3e2ba59 JD |
1405 | break; |
1406 | case VIEWER_GET_METADATA: | |
92c6ca54 | 1407 | ret = viewer_get_metadata(cmd); |
d3e2ba59 JD |
1408 | break; |
1409 | default: | |
1410 | ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd)); | |
1411 | live_relay_unknown_command(cmd); | |
1412 | ret = -1; | |
1413 | goto end; | |
1414 | } | |
1415 | ||
1416 | end: | |
1417 | return ret; | |
1418 | } | |
1419 | ||
1420 | static | |
1421 | void cleanup_poll_connection(struct lttng_poll_event *events, int pollfd) | |
1422 | { | |
1423 | int ret; | |
1424 | ||
1425 | assert(events); | |
1426 | ||
1427 | lttng_poll_del(events, pollfd); | |
1428 | ||
1429 | ret = close(pollfd); | |
1430 | if (ret < 0) { | |
1431 | ERR("Closing pollfd %d", pollfd); | |
1432 | } | |
1433 | } | |
1434 | ||
1435 | /* | |
1436 | * Create and add connection to the given hash table. | |
1437 | * | |
1438 | * Return poll add value or else -1 on error. | |
1439 | */ | |
1440 | static | |
1441 | int add_connection(int fd, struct lttng_poll_event *events, | |
1442 | struct lttng_ht *relay_connections_ht) | |
1443 | { | |
1444 | int ret; | |
1445 | struct relay_command *relay_connection; | |
1446 | ||
1447 | assert(events); | |
1448 | assert(relay_connections_ht); | |
1449 | ||
1450 | relay_connection = zmalloc(sizeof(struct relay_command)); | |
1451 | if (relay_connection == NULL) { | |
1452 | PERROR("Relay command zmalloc"); | |
1453 | goto error; | |
1454 | } | |
1455 | ||
1456 | do { | |
eea7556c | 1457 | health_code_update(); |
d3e2ba59 JD |
1458 | ret = read(fd, relay_connection, sizeof(*relay_connection)); |
1459 | } while (ret < 0 && errno == EINTR); | |
1460 | if (ret < 0 || ret < sizeof(*relay_connection)) { | |
1461 | PERROR("read relay cmd pipe"); | |
1462 | goto error_read; | |
1463 | } | |
1464 | ||
1465 | lttng_ht_node_init_ulong(&relay_connection->sock_n, | |
1466 | (unsigned long) relay_connection->sock->fd); | |
1467 | rcu_read_lock(); | |
1468 | lttng_ht_add_unique_ulong(relay_connections_ht, | |
1469 | &relay_connection->sock_n); | |
1470 | rcu_read_unlock(); | |
1471 | ||
1472 | return lttng_poll_add(events, relay_connection->sock->fd, | |
1473 | LPOLLIN | LPOLLRDHUP); | |
1474 | ||
1475 | error_read: | |
1476 | free(relay_connection); | |
1477 | error: | |
1478 | return -1; | |
1479 | } | |
1480 | ||
1481 | static | |
1482 | void deferred_free_connection(struct rcu_head *head) | |
1483 | { | |
1484 | struct relay_command *relay_connection = | |
1485 | caa_container_of(head, struct relay_command, rcu_node); | |
1486 | ||
1487 | if (relay_connection->session && | |
1488 | relay_connection->session->viewer_attached > 0) { | |
1489 | relay_connection->session->viewer_attached--; | |
1490 | } | |
1491 | lttcomm_destroy_sock(relay_connection->sock); | |
1492 | free(relay_connection); | |
1493 | } | |
1494 | ||
1495 | static | |
1496 | void deferred_free_viewer_stream(struct rcu_head *head) | |
1497 | { | |
1498 | struct relay_viewer_stream *stream = | |
1499 | caa_container_of(head, struct relay_viewer_stream, rcu_node); | |
1500 | ||
1501 | if (stream->ctf_trace) { | |
1502 | uatomic_dec(&stream->ctf_trace->refcount); | |
1503 | assert(uatomic_read(&stream->ctf_trace->refcount) >= 0); | |
1504 | if (uatomic_read(&stream->ctf_trace->refcount) == 0) { | |
1505 | DBG("Freeing ctf_trace %" PRIu64, stream->ctf_trace->id); | |
1506 | free(stream->ctf_trace); | |
1507 | } | |
1508 | } | |
1509 | ||
1510 | free(stream->path_name); | |
1511 | free(stream->channel_name); | |
1512 | free(stream); | |
1513 | } | |
1514 | ||
1515 | static | |
b92fdc2b | 1516 | void viewer_del_streams(uint64_t session_id) |
d3e2ba59 JD |
1517 | { |
1518 | int ret; | |
1519 | struct relay_viewer_stream *stream; | |
1520 | struct lttng_ht_node_u64 *node; | |
1521 | struct lttng_ht_iter iter; | |
1522 | ||
d3e2ba59 JD |
1523 | rcu_read_lock(); |
1524 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) { | |
eea7556c MD |
1525 | health_code_update(); |
1526 | ||
d3e2ba59 JD |
1527 | node = lttng_ht_iter_get_node_u64(&iter); |
1528 | if (!node) { | |
1529 | continue; | |
1530 | } | |
1531 | ||
1532 | stream = caa_container_of(node, struct relay_viewer_stream, stream_n); | |
b92fdc2b | 1533 | if (stream->session_id != session_id) { |
d3e2ba59 JD |
1534 | continue; |
1535 | } | |
1536 | ||
1537 | if (stream->read_fd > 0) { | |
1538 | ret = close(stream->read_fd); | |
1539 | if (ret < 0) { | |
1540 | PERROR("close read_fd"); | |
1541 | } | |
1542 | } | |
1543 | if (stream->index_read_fd > 0) { | |
1544 | ret = close(stream->index_read_fd); | |
1545 | if (ret < 0) { | |
1546 | PERROR("close index_read_fd"); | |
1547 | } | |
1548 | } | |
1549 | if (stream->metadata_flag && stream->ctf_trace) { | |
1550 | stream->ctf_trace->metadata_sent = 0; | |
1551 | } | |
1552 | ret = lttng_ht_del(viewer_streams_ht, &iter); | |
1553 | assert(!ret); | |
1554 | call_rcu(&stream->rcu_node, deferred_free_viewer_stream); | |
1555 | } | |
1556 | rcu_read_unlock(); | |
1557 | } | |
1558 | ||
1559 | /* | |
1560 | * Delete and free a connection. | |
1561 | * | |
1562 | * RCU read side lock MUST be acquired. | |
1563 | */ | |
1564 | static | |
1565 | void del_connection(struct lttng_ht *relay_connections_ht, | |
92c6ca54 | 1566 | struct lttng_ht_iter *iter, struct relay_command *relay_connection) |
d3e2ba59 JD |
1567 | { |
1568 | int ret; | |
1569 | ||
1570 | assert(relay_connections_ht); | |
1571 | assert(iter); | |
1572 | assert(relay_connection); | |
d3e2ba59 JD |
1573 | |
1574 | ret = lttng_ht_del(relay_connections_ht, iter); | |
1575 | assert(!ret); | |
1576 | ||
b92fdc2b | 1577 | viewer_del_streams(relay_connection->session_id); |
d3e2ba59 JD |
1578 | |
1579 | call_rcu(&relay_connection->rcu_node, deferred_free_connection); | |
1580 | } | |
1581 | ||
1582 | /* | |
1583 | * This thread does the actual work | |
1584 | */ | |
1585 | static | |
1586 | void *thread_worker(void *data) | |
1587 | { | |
1588 | int ret, err = -1; | |
1589 | uint32_t nb_fd; | |
1590 | struct relay_command *relay_connection; | |
1591 | struct lttng_poll_event events; | |
1592 | struct lttng_ht *relay_connections_ht; | |
1593 | struct lttng_ht_node_ulong *node; | |
1594 | struct lttng_ht_iter iter; | |
1595 | struct lttng_viewer_cmd recv_hdr; | |
1596 | struct relay_local_data *relay_ctx = (struct relay_local_data *) data; | |
1597 | struct lttng_ht *sessions_ht = relay_ctx->sessions_ht; | |
d3e2ba59 JD |
1598 | |
1599 | DBG("[thread] Live viewer relay worker started"); | |
1600 | ||
1601 | rcu_register_thread(); | |
1602 | ||
eea7556c MD |
1603 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
1604 | ||
d3e2ba59 JD |
1605 | /* table of connections indexed on socket */ |
1606 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1607 | if (!relay_connections_ht) { | |
1608 | goto relay_connections_ht_error; | |
1609 | } | |
1610 | ||
1611 | ret = create_thread_poll_set(&events, 2); | |
1612 | if (ret < 0) { | |
1613 | goto error_poll_create; | |
1614 | } | |
1615 | ||
1616 | ret = lttng_poll_add(&events, live_relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); | |
1617 | if (ret < 0) { | |
1618 | goto error; | |
1619 | } | |
1620 | ||
1621 | restart: | |
1622 | while (1) { | |
1623 | int i; | |
1624 | ||
eea7556c MD |
1625 | health_code_update(); |
1626 | ||
d3e2ba59 JD |
1627 | /* Infinite blocking call, waiting for transmission */ |
1628 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 1629 | health_poll_entry(); |
d3e2ba59 | 1630 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 1631 | health_poll_exit(); |
d3e2ba59 JD |
1632 | if (ret < 0) { |
1633 | /* | |
1634 | * Restart interrupted system call. | |
1635 | */ | |
1636 | if (errno == EINTR) { | |
1637 | goto restart; | |
1638 | } | |
1639 | goto error; | |
1640 | } | |
1641 | ||
1642 | nb_fd = ret; | |
1643 | ||
1644 | /* | |
1645 | * Process control. The control connection is prioritised so we don't | |
1646 | * starve it with high throughput tracing data on the data | |
1647 | * connection. | |
1648 | */ | |
1649 | for (i = 0; i < nb_fd; i++) { | |
1650 | /* Fetch once the poll data */ | |
1651 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1652 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1653 | ||
eea7556c MD |
1654 | health_code_update(); |
1655 | ||
d3e2ba59 JD |
1656 | /* Thread quit pipe has been closed. Killing thread. */ |
1657 | ret = check_thread_quit_pipe(pollfd, revents); | |
1658 | if (ret) { | |
1659 | err = 0; | |
1660 | goto exit; | |
1661 | } | |
1662 | ||
1663 | /* Inspect the relay cmd pipe for new connection */ | |
1664 | if (pollfd == live_relay_cmd_pipe[0]) { | |
1665 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1666 | ERR("Relay live pipe error"); | |
1667 | goto error; | |
1668 | } else if (revents & LPOLLIN) { | |
1669 | DBG("Relay live viewer command received"); | |
1670 | ret = add_connection(live_relay_cmd_pipe[0], | |
1671 | &events, relay_connections_ht); | |
1672 | if (ret < 0) { | |
1673 | goto error; | |
1674 | } | |
1675 | } | |
1676 | } else if (revents) { | |
1677 | rcu_read_lock(); | |
1678 | lttng_ht_lookup(relay_connections_ht, | |
1679 | (void *)((unsigned long) pollfd), &iter); | |
1680 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1681 | if (node == NULL) { | |
1682 | DBG2("Relay viewer sock %d not found", pollfd); | |
1683 | rcu_read_unlock(); | |
1684 | goto error; | |
1685 | } | |
1686 | relay_connection = caa_container_of(node, struct relay_command, | |
1687 | sock_n); | |
1688 | ||
1689 | if (revents & (LPOLLERR)) { | |
d3e2ba59 JD |
1690 | cleanup_poll_connection(&events, pollfd); |
1691 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1692 | relay_connection); |
d3e2ba59 JD |
1693 | } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { |
1694 | DBG("Viewer socket %d hung up", pollfd); | |
1695 | cleanup_poll_connection(&events, pollfd); | |
1696 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1697 | relay_connection); |
d3e2ba59 JD |
1698 | } else if (revents & LPOLLIN) { |
1699 | ret = relay_connection->sock->ops->recvmsg( | |
1700 | relay_connection->sock, &recv_hdr, | |
1701 | sizeof(struct lttng_viewer_cmd), | |
1702 | 0); | |
1703 | /* connection closed */ | |
1704 | if (ret <= 0) { | |
1705 | cleanup_poll_connection(&events, pollfd); | |
1706 | del_connection( relay_connections_ht, &iter, | |
92c6ca54 | 1707 | relay_connection); |
d3e2ba59 JD |
1708 | DBG("Viewer control connection closed with %d", |
1709 | pollfd); | |
1710 | } else { | |
1711 | if (relay_connection->session) { | |
1712 | DBG2("Relay viewer worker receiving data for " | |
1713 | "session: %" PRIu64, | |
1714 | relay_connection->session->id); | |
1715 | } | |
1716 | ret = process_control(&recv_hdr, relay_connection, | |
92c6ca54 | 1717 | sessions_ht); |
d3e2ba59 JD |
1718 | if (ret < 0) { |
1719 | /* Clear the session on error. */ | |
1720 | cleanup_poll_connection(&events, pollfd); | |
1721 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1722 | relay_connection); |
d3e2ba59 JD |
1723 | DBG("Viewer connection closed with %d", pollfd); |
1724 | } | |
1725 | } | |
1726 | } | |
1727 | rcu_read_unlock(); | |
1728 | } | |
1729 | } | |
1730 | } | |
1731 | ||
1732 | exit: | |
1733 | error: | |
1734 | lttng_poll_clean(&events); | |
1735 | ||
1736 | /* empty the hash table and free the memory */ | |
1737 | rcu_read_lock(); | |
1738 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { | |
eea7556c MD |
1739 | health_code_update(); |
1740 | ||
d3e2ba59 JD |
1741 | node = lttng_ht_iter_get_node_ulong(&iter); |
1742 | if (!node) { | |
1743 | continue; | |
1744 | } | |
1745 | ||
1746 | relay_connection = caa_container_of(node, struct relay_command, | |
1747 | sock_n); | |
92c6ca54 | 1748 | del_connection(relay_connections_ht, &iter, relay_connection); |
d3e2ba59 JD |
1749 | } |
1750 | rcu_read_unlock(); | |
1751 | error_poll_create: | |
1752 | lttng_ht_destroy(relay_connections_ht); | |
1753 | relay_connections_ht_error: | |
1754 | /* Close relay cmd pipes */ | |
1755 | utils_close_pipe(live_relay_cmd_pipe); | |
1756 | if (err) { | |
1757 | DBG("Viewer worker thread exited with error"); | |
1758 | } | |
1759 | DBG("Viewer worker thread cleanup complete"); | |
eea7556c MD |
1760 | if (err) { |
1761 | health_error(); | |
1762 | ERR("Health error occurred in %s", __func__); | |
1763 | } | |
1764 | health_unregister(health_relayd); | |
d3e2ba59 JD |
1765 | stop_threads(); |
1766 | rcu_unregister_thread(); | |
1767 | return NULL; | |
1768 | } | |
1769 | ||
1770 | /* | |
1771 | * Create the relay command pipe to wake thread_manage_apps. | |
1772 | * Closed in cleanup(). | |
1773 | */ | |
1774 | static int create_relay_cmd_pipe(void) | |
1775 | { | |
1776 | int ret; | |
1777 | ||
1778 | ret = utils_create_pipe_cloexec(live_relay_cmd_pipe); | |
1779 | ||
1780 | return ret; | |
1781 | } | |
1782 | ||
1783 | void live_stop_threads() | |
1784 | { | |
1785 | int ret; | |
1786 | void *status; | |
1787 | ||
1788 | stop_threads(); | |
1789 | ||
1790 | ret = pthread_join(live_listener_thread, &status); | |
1791 | if (ret != 0) { | |
1792 | PERROR("pthread_join live listener"); | |
1793 | goto error; /* join error, exit without cleanup */ | |
1794 | } | |
1795 | ||
1796 | ret = pthread_join(live_worker_thread, &status); | |
1797 | if (ret != 0) { | |
1798 | PERROR("pthread_join live worker"); | |
1799 | goto error; /* join error, exit without cleanup */ | |
1800 | } | |
1801 | ||
1802 | ret = pthread_join(live_dispatcher_thread, &status); | |
1803 | if (ret != 0) { | |
1804 | PERROR("pthread_join live dispatcher"); | |
1805 | goto error; /* join error, exit without cleanup */ | |
1806 | } | |
1807 | ||
1808 | cleanup(); | |
1809 | ||
1810 | error: | |
1811 | return; | |
1812 | } | |
1813 | ||
1814 | /* | |
1815 | * main | |
1816 | */ | |
1817 | int live_start_threads(struct lttng_uri *uri, | |
42415026 | 1818 | struct relay_local_data *relay_ctx, int quit_pipe[2]) |
d3e2ba59 JD |
1819 | { |
1820 | int ret = 0; | |
1821 | void *status; | |
1822 | int is_root; | |
1823 | ||
1824 | assert(uri); | |
1825 | live_uri = uri; | |
1826 | ||
42415026 DG |
1827 | live_thread_quit_pipe[0] = quit_pipe[0]; |
1828 | live_thread_quit_pipe[1] = quit_pipe[1]; | |
d3e2ba59 JD |
1829 | |
1830 | /* Check if daemon is UID = 0 */ | |
1831 | is_root = !getuid(); | |
1832 | ||
1833 | if (!is_root) { | |
1834 | if (live_uri->port < 1024) { | |
1835 | ERR("Need to be root to use ports < 1024"); | |
1836 | ret = -1; | |
1837 | goto exit; | |
1838 | } | |
1839 | } | |
1840 | ||
1841 | /* Setup the thread apps communication pipe. */ | |
1842 | if ((ret = create_relay_cmd_pipe()) < 0) { | |
1843 | goto exit; | |
1844 | } | |
1845 | ||
1846 | /* Init relay command queue. */ | |
1847 | cds_wfq_init(&viewer_cmd_queue.queue); | |
1848 | ||
1849 | /* Set up max poll set size */ | |
1850 | lttng_poll_set_max_size(); | |
1851 | ||
1852 | /* Setup the dispatcher thread */ | |
1853 | ret = pthread_create(&live_dispatcher_thread, NULL, | |
1854 | thread_dispatcher, (void *) NULL); | |
1855 | if (ret != 0) { | |
1856 | PERROR("pthread_create viewer dispatcher"); | |
1857 | goto exit_dispatcher; | |
1858 | } | |
1859 | ||
1860 | /* Setup the worker thread */ | |
1861 | ret = pthread_create(&live_worker_thread, NULL, | |
1862 | thread_worker, relay_ctx); | |
1863 | if (ret != 0) { | |
1864 | PERROR("pthread_create viewer worker"); | |
1865 | goto exit_worker; | |
1866 | } | |
1867 | ||
1868 | /* Setup the listener thread */ | |
1869 | ret = pthread_create(&live_listener_thread, NULL, | |
1870 | thread_listener, (void *) NULL); | |
1871 | if (ret != 0) { | |
1872 | PERROR("pthread_create viewer listener"); | |
1873 | goto exit_listener; | |
1874 | } | |
1875 | ||
1876 | ret = 0; | |
1877 | goto end; | |
1878 | ||
1879 | exit_listener: | |
1880 | ret = pthread_join(live_listener_thread, &status); | |
1881 | if (ret != 0) { | |
1882 | PERROR("pthread_join live listener"); | |
1883 | goto error; /* join error, exit without cleanup */ | |
1884 | } | |
1885 | ||
1886 | exit_worker: | |
1887 | ret = pthread_join(live_worker_thread, &status); | |
1888 | if (ret != 0) { | |
1889 | PERROR("pthread_join live worker"); | |
1890 | goto error; /* join error, exit without cleanup */ | |
1891 | } | |
1892 | ||
1893 | exit_dispatcher: | |
1894 | ret = pthread_join(live_dispatcher_thread, &status); | |
1895 | if (ret != 0) { | |
1896 | PERROR("pthread_join live dispatcher"); | |
1897 | goto error; /* join error, exit without cleanup */ | |
1898 | } | |
1899 | ||
1900 | exit: | |
1901 | cleanup(); | |
1902 | ||
1903 | end: | |
1904 | error: | |
1905 | return ret; | |
1906 | } |