Commit | Line | Data |
---|---|---|
d3e2ba59 JD |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
5a693d30 | 4 | * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
d3e2ba59 JD |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
20 | #define _GNU_SOURCE | |
6c1c0768 | 21 | #define _LGPL_SOURCE |
d3e2ba59 JD |
22 | #include <getopt.h> |
23 | #include <grp.h> | |
24 | #include <limits.h> | |
25 | #include <pthread.h> | |
26 | #include <signal.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
30 | #include <sys/mman.h> | |
31 | #include <sys/mount.h> | |
32 | #include <sys/resource.h> | |
33 | #include <sys/socket.h> | |
34 | #include <sys/stat.h> | |
35 | #include <sys/types.h> | |
36 | #include <sys/wait.h> | |
37 | #include <inttypes.h> | |
38 | #include <urcu/futex.h> | |
39 | #include <urcu/uatomic.h> | |
5a693d30 | 40 | #include <urcu/rculist.h> |
d3e2ba59 JD |
41 | #include <unistd.h> |
42 | #include <fcntl.h> | |
43 | #include <config.h> | |
44 | ||
45 | #include <lttng/lttng.h> | |
46 | #include <common/common.h> | |
47 | #include <common/compat/poll.h> | |
48 | #include <common/compat/socket.h> | |
f263b7fd | 49 | #include <common/compat/endian.h> |
d3e2ba59 JD |
50 | #include <common/defaults.h> |
51 | #include <common/futex.h> | |
2f8f53af | 52 | #include <common/index/index.h> |
d3e2ba59 JD |
53 | #include <common/sessiond-comm/sessiond-comm.h> |
54 | #include <common/sessiond-comm/inet.h> | |
55 | #include <common/sessiond-comm/relayd.h> | |
56 | #include <common/uri.h> | |
57 | #include <common/utils.h> | |
58 | ||
59 | #include "cmd.h" | |
60 | #include "live.h" | |
61 | #include "lttng-relayd.h" | |
d3e2ba59 | 62 | #include "utils.h" |
eea7556c | 63 | #include "health-relayd.h" |
9b5e0863 | 64 | #include "testpoint.h" |
2f8f53af | 65 | #include "viewer-stream.h" |
2a174661 DG |
66 | #include "stream.h" |
67 | #include "session.h" | |
68 | #include "ctf-trace.h" | |
58eb9381 | 69 | #include "connection.h" |
5a693d30 MD |
70 | #include "viewer-session.h" |
71 | ||
72 | #define SESSION_BUF_DEFAULT_COUNT 16 | |
d3e2ba59 JD |
73 | |
74 | static struct lttng_uri *live_uri; | |
75 | ||
d3e2ba59 JD |
76 | /* |
77 | * This pipe is used to inform the worker thread that a command is queued and | |
78 | * ready to be processed. | |
79 | */ | |
58eb9381 | 80 | static int live_conn_pipe[2] = { -1, -1 }; |
d3e2ba59 JD |
81 | |
82 | /* Shared between threads */ | |
83 | static int live_dispatch_thread_exit; | |
84 | ||
85 | static pthread_t live_listener_thread; | |
86 | static pthread_t live_dispatcher_thread; | |
87 | static pthread_t live_worker_thread; | |
88 | ||
89 | /* | |
90 | * Relay command queue. | |
91 | * | |
92 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
93 | * queue. | |
94 | */ | |
58eb9381 | 95 | static struct relay_conn_queue viewer_conn_queue; |
d3e2ba59 JD |
96 | |
97 | static uint64_t last_relay_viewer_session_id; | |
5a693d30 MD |
98 | static pthread_mutex_t last_relay_viewer_session_id_lock = |
99 | PTHREAD_MUTEX_INITIALIZER; | |
d3e2ba59 JD |
100 | |
101 | /* | |
102 | * Cleanup the daemon | |
103 | */ | |
104 | static | |
178a0557 | 105 | void cleanup_relayd_live(void) |
d3e2ba59 JD |
106 | { |
107 | DBG("Cleaning up"); | |
108 | ||
d3e2ba59 JD |
109 | free(live_uri); |
110 | } | |
111 | ||
2f8f53af DG |
112 | /* |
113 | * Receive a request buffer using a given socket, destination allocated buffer | |
114 | * of length size. | |
115 | * | |
116 | * Return the size of the received message or else a negative value on error | |
117 | * with errno being set by recvmsg() syscall. | |
118 | */ | |
119 | static | |
120 | ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size) | |
121 | { | |
122 | ssize_t ret; | |
123 | ||
2f8f53af DG |
124 | ret = sock->ops->recvmsg(sock, buf, size, 0); |
125 | if (ret < 0 || ret != size) { | |
126 | if (ret == 0) { | |
127 | /* Orderly shutdown. Not necessary to print an error. */ | |
128 | DBG("Socket %d did an orderly shutdown", sock->fd); | |
129 | } else { | |
130 | ERR("Relay failed to receive request."); | |
131 | } | |
132 | ret = -1; | |
133 | } | |
134 | ||
135 | return ret; | |
136 | } | |
137 | ||
138 | /* | |
139 | * Send a response buffer using a given socket, source allocated buffer of | |
140 | * length size. | |
141 | * | |
142 | * Return the size of the sent message or else a negative value on error with | |
143 | * errno being set by sendmsg() syscall. | |
144 | */ | |
145 | static | |
146 | ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size) | |
147 | { | |
148 | ssize_t ret; | |
149 | ||
2f8f53af DG |
150 | ret = sock->ops->sendmsg(sock, buf, size, 0); |
151 | if (ret < 0) { | |
152 | ERR("Relayd failed to send response."); | |
153 | } | |
154 | ||
155 | return ret; | |
156 | } | |
157 | ||
158 | /* | |
f04a971b JD |
159 | * Atomically check if new streams got added in one of the sessions attached |
160 | * and reset the flag to 0. | |
2f8f53af DG |
161 | * |
162 | * Returns 1 if new streams got added, 0 if nothing changed, a negative value | |
163 | * on error. | |
164 | */ | |
165 | static | |
f04a971b | 166 | int check_new_streams(struct relay_connection *conn) |
2f8f53af | 167 | { |
2f8f53af | 168 | struct relay_session *session; |
f04a971b JD |
169 | unsigned long current_val; |
170 | int ret = 0; | |
2f8f53af | 171 | |
f04a971b JD |
172 | if (!conn->viewer_session) { |
173 | goto end; | |
174 | } | |
5a693d30 MD |
175 | rcu_read_lock(); |
176 | cds_list_for_each_entry_rcu(session, | |
177 | &conn->viewer_session->session_list, | |
178 | viewer_session_node) { | |
179 | if (!session_get(session)) { | |
180 | continue; | |
181 | } | |
f04a971b JD |
182 | current_val = uatomic_cmpxchg(&session->new_streams, 1, 0); |
183 | ret = current_val; | |
5a693d30 | 184 | session_put(session); |
f04a971b JD |
185 | if (ret == 1) { |
186 | goto end; | |
187 | } | |
2f8f53af | 188 | } |
f04a971b | 189 | end: |
5a693d30 | 190 | rcu_read_unlock(); |
2f8f53af DG |
191 | return ret; |
192 | } | |
193 | ||
194 | /* | |
195 | * Send viewer streams to the given socket. The ignore_sent_flag indicates if | |
196 | * this function should ignore the sent flag or not. | |
197 | * | |
198 | * Return 0 on success or else a negative value. | |
199 | */ | |
200 | static | |
201 | ssize_t send_viewer_streams(struct lttcomm_sock *sock, | |
202 | struct relay_session *session, unsigned int ignore_sent_flag) | |
203 | { | |
204 | ssize_t ret; | |
205 | struct lttng_viewer_stream send_stream; | |
206 | struct lttng_ht_iter iter; | |
207 | struct relay_viewer_stream *vstream; | |
208 | ||
2f8f53af DG |
209 | rcu_read_lock(); |
210 | ||
211 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
212 | stream_n.node) { | |
2a174661 DG |
213 | struct ctf_trace *ctf_trace; |
214 | ||
2f8f53af DG |
215 | health_code_update(); |
216 | ||
5a693d30 MD |
217 | if (!viewer_stream_get(vstream)) { |
218 | continue; | |
219 | } | |
220 | ||
221 | pthread_mutex_lock(&vstream->stream->lock); | |
2f8f53af | 222 | /* Ignore if not the same session. */ |
5a693d30 | 223 | if (vstream->stream->trace->session->id != session->id || |
2f8f53af | 224 | (!ignore_sent_flag && vstream->sent_flag)) { |
5a693d30 MD |
225 | pthread_mutex_unlock(&vstream->stream->lock); |
226 | viewer_stream_put(vstream); | |
2f8f53af DG |
227 | continue; |
228 | } | |
229 | ||
5a693d30 MD |
230 | ctf_trace = vstream->stream->trace; |
231 | send_stream.id = htobe64(vstream->stream->stream_handle); | |
2a174661 | 232 | send_stream.ctf_trace_id = htobe64(ctf_trace->id); |
5a693d30 MD |
233 | send_stream.metadata_flag = htobe32( |
234 | vstream->stream->is_metadata); | |
9955cae0 MD |
235 | if (lttng_strncpy(send_stream.path_name, vstream->path_name, |
236 | sizeof(send_stream.path_name))) { | |
237 | pthread_mutex_unlock(&vstream->stream->lock); | |
238 | viewer_stream_put(vstream); | |
239 | ret = -1; /* Error. */ | |
240 | goto end_unlock; | |
241 | } | |
242 | if (lttng_strncpy(send_stream.channel_name, | |
243 | vstream->channel_name, | |
244 | sizeof(send_stream.channel_name))) { | |
245 | pthread_mutex_unlock(&vstream->stream->lock); | |
246 | viewer_stream_put(vstream); | |
247 | ret = -1; /* Error. */ | |
248 | goto end_unlock; | |
249 | } | |
2f8f53af | 250 | |
5a693d30 MD |
251 | DBG("Sending stream %" PRIu64 " to viewer", |
252 | vstream->stream->stream_handle); | |
253 | vstream->sent_flag = 1; | |
254 | pthread_mutex_unlock(&vstream->stream->lock); | |
255 | ||
2f8f53af | 256 | ret = send_response(sock, &send_stream, sizeof(send_stream)); |
5a693d30 | 257 | viewer_stream_put(vstream); |
2f8f53af DG |
258 | if (ret < 0) { |
259 | goto end_unlock; | |
260 | } | |
2f8f53af DG |
261 | } |
262 | ||
263 | ret = 0; | |
264 | ||
265 | end_unlock: | |
266 | rcu_read_unlock(); | |
267 | return ret; | |
268 | } | |
269 | ||
270 | /* | |
271 | * Create every viewer stream possible for the given session with the seek | |
272 | * type. Three counters *can* be return which are in order the total amount of | |
273 | * viewer stream of the session, the number of unsent stream and the number of | |
274 | * stream created. Those counters can be NULL and thus will be ignored. | |
275 | * | |
276 | * Return 0 on success or else a negative value. | |
277 | */ | |
278 | static | |
279 | int make_viewer_streams(struct relay_session *session, | |
280 | enum lttng_viewer_seek seek_t, uint32_t *nb_total, uint32_t *nb_unsent, | |
47d9f81a | 281 | uint32_t *nb_created, bool *closed) |
2f8f53af DG |
282 | { |
283 | int ret; | |
2f8f53af | 284 | struct lttng_ht_iter iter; |
2a174661 | 285 | struct ctf_trace *ctf_trace; |
2f8f53af DG |
286 | |
287 | assert(session); | |
288 | ||
289 | /* | |
5a693d30 MD |
290 | * Hold the session lock to ensure that we see either none or |
291 | * all initial streams for a session, but no intermediate state. | |
2f8f53af | 292 | */ |
5a693d30 | 293 | pthread_mutex_lock(&session->lock); |
2f8f53af | 294 | |
47d9f81a MD |
295 | if (session->connection_closed) { |
296 | *closed = true; | |
297 | } | |
298 | ||
2f8f53af | 299 | /* |
5a693d30 MD |
300 | * Create viewer streams for relay streams that are ready to be |
301 | * used for a the given session id only. | |
2f8f53af | 302 | */ |
2a174661 DG |
303 | rcu_read_lock(); |
304 | cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, | |
305 | node.node) { | |
306 | struct relay_stream *stream; | |
2f8f53af DG |
307 | |
308 | health_code_update(); | |
309 | ||
5a693d30 | 310 | if (!ctf_trace_get(ctf_trace)) { |
2f8f53af DG |
311 | continue; |
312 | } | |
313 | ||
5a693d30 | 314 | cds_list_for_each_entry_rcu(stream, &ctf_trace->stream_list, stream_node) { |
2a174661 DG |
315 | struct relay_viewer_stream *vstream; |
316 | ||
5a693d30 | 317 | if (!stream_get(stream)) { |
2a174661 DG |
318 | continue; |
319 | } | |
5a693d30 | 320 | /* |
7475f716 | 321 | * stream published is protected by the session lock. |
5a693d30 MD |
322 | */ |
323 | if (!stream->published) { | |
324 | goto next; | |
325 | } | |
326 | vstream = viewer_stream_get_by_id(stream->stream_handle); | |
2f8f53af | 327 | if (!vstream) { |
5a693d30 | 328 | vstream = viewer_stream_create(stream, seek_t); |
2a174661 DG |
329 | if (!vstream) { |
330 | ret = -1; | |
5a693d30 MD |
331 | ctf_trace_put(ctf_trace); |
332 | stream_put(stream); | |
2a174661 DG |
333 | goto error_unlock; |
334 | } | |
2a174661 DG |
335 | |
336 | if (nb_created) { | |
337 | /* Update number of created stream counter. */ | |
338 | (*nb_created)++; | |
339 | } | |
8cd956bc MD |
340 | /* |
341 | * Ensure a self-reference is preserved even | |
342 | * after we have put our local reference. | |
343 | */ | |
a9aa7c77 MD |
344 | if (!viewer_stream_get(vstream)) { |
345 | ERR("Unable to get self-reference on viewer stream, logic error."); | |
346 | abort(); | |
347 | } | |
5a693d30 MD |
348 | } else { |
349 | if (!vstream->sent_flag && nb_unsent) { | |
350 | /* Update number of unsent stream counter. */ | |
351 | (*nb_unsent)++; | |
352 | } | |
2f8f53af | 353 | } |
2a174661 DG |
354 | /* Update number of total stream counter. */ |
355 | if (nb_total) { | |
8cd956bc MD |
356 | if (stream->is_metadata) { |
357 | if (!stream->closed || | |
358 | stream->metadata_received > vstream->metadata_sent) { | |
359 | (*nb_total)++; | |
360 | } | |
361 | } else { | |
362 | if (!stream->closed || | |
363 | !(((int64_t) (stream->prev_seq - stream->last_net_seq_num)) >= 0)) { | |
364 | ||
365 | (*nb_total)++; | |
366 | } | |
367 | } | |
2f8f53af | 368 | } |
8cd956bc MD |
369 | /* Put local reference. */ |
370 | viewer_stream_put(vstream); | |
5a693d30 MD |
371 | next: |
372 | stream_put(stream); | |
2f8f53af | 373 | } |
5a693d30 | 374 | ctf_trace_put(ctf_trace); |
2f8f53af DG |
375 | } |
376 | ||
377 | ret = 0; | |
378 | ||
379 | error_unlock: | |
2a174661 | 380 | rcu_read_unlock(); |
5a693d30 | 381 | pthread_mutex_unlock(&session->lock); |
2f8f53af DG |
382 | return ret; |
383 | } | |
384 | ||
b4aacfdc | 385 | int relayd_live_stop(void) |
d3e2ba59 | 386 | { |
b4aacfdc | 387 | /* Stop dispatch thread */ |
d3e2ba59 | 388 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); |
58eb9381 | 389 | futex_nto1_wake(&viewer_conn_queue.futex); |
b4aacfdc | 390 | return 0; |
d3e2ba59 JD |
391 | } |
392 | ||
d3e2ba59 JD |
393 | /* |
394 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
395 | */ | |
396 | static | |
397 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
398 | { | |
399 | int ret; | |
400 | ||
401 | if (events == NULL || size == 0) { | |
402 | ret = -1; | |
403 | goto error; | |
404 | } | |
405 | ||
406 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
407 | if (ret < 0) { | |
408 | goto error; | |
409 | } | |
410 | ||
411 | /* Add quit pipe */ | |
bcf4a440 | 412 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
d3e2ba59 JD |
413 | if (ret < 0) { |
414 | goto error; | |
415 | } | |
416 | ||
417 | return 0; | |
418 | ||
419 | error: | |
420 | return ret; | |
421 | } | |
422 | ||
423 | /* | |
424 | * Check if the thread quit pipe was triggered. | |
425 | * | |
426 | * Return 1 if it was triggered else 0; | |
427 | */ | |
428 | static | |
bcf4a440 | 429 | int check_thread_quit_pipe(int fd, uint32_t events) |
d3e2ba59 | 430 | { |
bcf4a440 | 431 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
432 | return 1; |
433 | } | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | /* | |
439 | * Create and init socket from uri. | |
440 | */ | |
441 | static | |
442 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
443 | { | |
444 | int ret; | |
445 | struct lttcomm_sock *sock = NULL; | |
446 | ||
447 | sock = lttcomm_alloc_sock_from_uri(uri); | |
448 | if (sock == NULL) { | |
449 | ERR("Allocating socket"); | |
450 | goto error; | |
451 | } | |
452 | ||
453 | ret = lttcomm_create_sock(sock); | |
454 | if (ret < 0) { | |
455 | goto error; | |
456 | } | |
457 | DBG("Listening on sock %d for live", sock->fd); | |
458 | ||
459 | ret = sock->ops->bind(sock); | |
460 | if (ret < 0) { | |
461 | goto error; | |
462 | } | |
463 | ||
464 | ret = sock->ops->listen(sock, -1); | |
465 | if (ret < 0) { | |
466 | goto error; | |
467 | ||
468 | } | |
469 | ||
470 | return sock; | |
471 | ||
472 | error: | |
473 | if (sock) { | |
474 | lttcomm_destroy_sock(sock); | |
475 | } | |
476 | return NULL; | |
477 | } | |
478 | ||
479 | /* | |
480 | * This thread manages the listening for new connections on the network | |
481 | */ | |
482 | static | |
483 | void *thread_listener(void *data) | |
484 | { | |
485 | int i, ret, pollfd, err = -1; | |
d3e2ba59 JD |
486 | uint32_t revents, nb_fd; |
487 | struct lttng_poll_event events; | |
488 | struct lttcomm_sock *live_control_sock; | |
489 | ||
490 | DBG("[thread] Relay live listener started"); | |
491 | ||
eea7556c MD |
492 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
493 | ||
494 | health_code_update(); | |
495 | ||
d3e2ba59 JD |
496 | live_control_sock = init_socket(live_uri); |
497 | if (!live_control_sock) { | |
498 | goto error_sock_control; | |
499 | } | |
500 | ||
fb4d42ab | 501 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
d3e2ba59 JD |
502 | ret = create_thread_poll_set(&events, 2); |
503 | if (ret < 0) { | |
504 | goto error_create_poll; | |
505 | } | |
506 | ||
507 | /* Add the control socket */ | |
508 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
509 | if (ret < 0) { | |
510 | goto error_poll_add; | |
511 | } | |
512 | ||
3fd27398 MD |
513 | lttng_relay_notify_ready(); |
514 | ||
9b5e0863 MD |
515 | if (testpoint(relayd_thread_live_listener)) { |
516 | goto error_testpoint; | |
517 | } | |
518 | ||
d3e2ba59 | 519 | while (1) { |
eea7556c MD |
520 | health_code_update(); |
521 | ||
d3e2ba59 JD |
522 | DBG("Listener accepting live viewers connections"); |
523 | ||
524 | restart: | |
eea7556c | 525 | health_poll_entry(); |
d3e2ba59 | 526 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 527 | health_poll_exit(); |
d3e2ba59 JD |
528 | if (ret < 0) { |
529 | /* | |
530 | * Restart interrupted system call. | |
531 | */ | |
532 | if (errno == EINTR) { | |
533 | goto restart; | |
534 | } | |
535 | goto error; | |
536 | } | |
537 | nb_fd = ret; | |
538 | ||
539 | DBG("Relay new viewer connection received"); | |
540 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
541 | health_code_update(); |
542 | ||
d3e2ba59 JD |
543 | /* Fetch once the poll data */ |
544 | revents = LTTNG_POLL_GETEV(&events, i); | |
545 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
546 | ||
fd20dac9 MD |
547 | if (!revents) { |
548 | /* No activity for this FD (poll implementation). */ | |
549 | continue; | |
550 | } | |
551 | ||
d3e2ba59 | 552 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 553 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
554 | if (ret) { |
555 | err = 0; | |
556 | goto exit; | |
557 | } | |
558 | ||
92d6debb | 559 | if (revents & LPOLLIN) { |
d3e2ba59 | 560 | /* |
5a693d30 MD |
561 | * A new connection is requested, therefore a |
562 | * viewer connection is allocated in this | |
563 | * thread, enqueued to a global queue and | |
564 | * dequeued (and freed) in the worker thread. | |
d3e2ba59 | 565 | */ |
58eb9381 DG |
566 | int val = 1; |
567 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
568 | struct lttcomm_sock *newsock; |
569 | ||
d3e2ba59 JD |
570 | newsock = live_control_sock->ops->accept(live_control_sock); |
571 | if (!newsock) { | |
572 | PERROR("accepting control sock"); | |
d3e2ba59 JD |
573 | goto error; |
574 | } | |
575 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 576 | |
d3e2ba59 | 577 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
58eb9381 | 578 | sizeof(val)); |
d3e2ba59 JD |
579 | if (ret < 0) { |
580 | PERROR("setsockopt inet"); | |
581 | lttcomm_destroy_sock(newsock); | |
d3e2ba59 JD |
582 | goto error; |
583 | } | |
5a693d30 MD |
584 | new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN); |
585 | if (!new_conn) { | |
586 | lttcomm_destroy_sock(newsock); | |
587 | goto error; | |
588 | } | |
589 | /* Ownership assumed by the connection. */ | |
590 | newsock = NULL; | |
d3e2ba59 | 591 | |
58eb9381 | 592 | /* Enqueue request for the dispatcher thread. */ |
8bdee6e2 SM |
593 | cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail, |
594 | &new_conn->qnode); | |
d3e2ba59 JD |
595 | |
596 | /* | |
5a693d30 MD |
597 | * Wake the dispatch queue futex. |
598 | * Implicit memory barrier with the | |
599 | * exchange in cds_wfcq_enqueue. | |
d3e2ba59 | 600 | */ |
58eb9381 | 601 | futex_nto1_wake(&viewer_conn_queue.futex); |
92d6debb MD |
602 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
603 | ERR("socket poll error"); | |
604 | goto error; | |
605 | } else { | |
606 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
607 | goto error; | |
d3e2ba59 JD |
608 | } |
609 | } | |
610 | } | |
611 | ||
612 | exit: | |
613 | error: | |
614 | error_poll_add: | |
9b5e0863 | 615 | error_testpoint: |
d3e2ba59 JD |
616 | lttng_poll_clean(&events); |
617 | error_create_poll: | |
618 | if (live_control_sock->fd >= 0) { | |
619 | ret = live_control_sock->ops->close(live_control_sock); | |
620 | if (ret) { | |
621 | PERROR("close"); | |
622 | } | |
623 | } | |
624 | lttcomm_destroy_sock(live_control_sock); | |
625 | error_sock_control: | |
626 | if (err) { | |
eea7556c | 627 | health_error(); |
d3e2ba59 JD |
628 | DBG("Live viewer listener thread exited with error"); |
629 | } | |
eea7556c | 630 | health_unregister(health_relayd); |
d3e2ba59 | 631 | DBG("Live viewer listener thread cleanup complete"); |
b4aacfdc MD |
632 | if (lttng_relay_stop_threads()) { |
633 | ERR("Error stopping threads"); | |
178a0557 | 634 | } |
d3e2ba59 JD |
635 | return NULL; |
636 | } | |
637 | ||
638 | /* | |
639 | * This thread manages the dispatching of the requests to worker threads | |
640 | */ | |
641 | static | |
642 | void *thread_dispatcher(void *data) | |
643 | { | |
6cd525e8 MD |
644 | int err = -1; |
645 | ssize_t ret; | |
8bdee6e2 | 646 | struct cds_wfcq_node *node; |
58eb9381 | 647 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
648 | |
649 | DBG("[thread] Live viewer relay dispatcher started"); | |
650 | ||
eea7556c MD |
651 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
652 | ||
9b5e0863 MD |
653 | if (testpoint(relayd_thread_live_dispatcher)) { |
654 | goto error_testpoint; | |
655 | } | |
656 | ||
eea7556c MD |
657 | health_code_update(); |
658 | ||
d3e2ba59 | 659 | while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
eea7556c MD |
660 | health_code_update(); |
661 | ||
d3e2ba59 | 662 | /* Atomically prepare the queue futex */ |
58eb9381 | 663 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 JD |
664 | |
665 | do { | |
eea7556c MD |
666 | health_code_update(); |
667 | ||
d3e2ba59 | 668 | /* Dequeue commands */ |
8bdee6e2 SM |
669 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
670 | &viewer_conn_queue.tail); | |
d3e2ba59 JD |
671 | if (node == NULL) { |
672 | DBG("Woken up but nothing in the live-viewer " | |
673 | "relay command queue"); | |
674 | /* Continue thread execution */ | |
675 | break; | |
676 | } | |
58eb9381 | 677 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 678 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 679 | conn->sock->fd); |
d3e2ba59 JD |
680 | |
681 | /* | |
5a693d30 MD |
682 | * Inform worker thread of the new request. This |
683 | * call is blocking so we can be assured that | |
684 | * the data will be read at some point in time | |
685 | * or wait to the end of the world :) | |
d3e2ba59 | 686 | */ |
58eb9381 DG |
687 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
688 | if (ret < 0) { | |
689 | PERROR("write conn pipe"); | |
5a693d30 | 690 | connection_put(conn); |
d3e2ba59 JD |
691 | goto error; |
692 | } | |
693 | } while (node != NULL); | |
694 | ||
695 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 696 | health_poll_entry(); |
58eb9381 | 697 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 698 | health_poll_exit(); |
d3e2ba59 JD |
699 | } |
700 | ||
eea7556c MD |
701 | /* Normal exit, no error */ |
702 | err = 0; | |
703 | ||
d3e2ba59 | 704 | error: |
9b5e0863 | 705 | error_testpoint: |
eea7556c MD |
706 | if (err) { |
707 | health_error(); | |
708 | ERR("Health error occurred in %s", __func__); | |
709 | } | |
710 | health_unregister(health_relayd); | |
d3e2ba59 | 711 | DBG("Live viewer dispatch thread dying"); |
b4aacfdc MD |
712 | if (lttng_relay_stop_threads()) { |
713 | ERR("Error stopping threads"); | |
178a0557 | 714 | } |
d3e2ba59 JD |
715 | return NULL; |
716 | } | |
717 | ||
718 | /* | |
719 | * Establish connection with the viewer and check the versions. | |
720 | * | |
721 | * Return 0 on success or else negative value. | |
722 | */ | |
723 | static | |
58eb9381 | 724 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
725 | { |
726 | int ret; | |
727 | struct lttng_viewer_connect reply, msg; | |
728 | ||
58eb9381 | 729 | conn->version_check_done = 1; |
d3e2ba59 | 730 | |
eea7556c MD |
731 | health_code_update(); |
732 | ||
2f8f53af DG |
733 | DBG("Viewer is establishing a connection to the relayd."); |
734 | ||
58eb9381 | 735 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 736 | if (ret < 0) { |
d3e2ba59 JD |
737 | goto end; |
738 | } | |
739 | ||
eea7556c MD |
740 | health_code_update(); |
741 | ||
f46b2ce6 | 742 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
743 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
744 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
745 | ||
746 | /* Major versions must be the same */ | |
747 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
748 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
749 | reply.major, be32toh(msg.major)); | |
72180669 | 750 | ret = -1; |
d3e2ba59 JD |
751 | goto end; |
752 | } | |
753 | ||
58eb9381 | 754 | conn->major = reply.major; |
d3e2ba59 JD |
755 | /* We adapt to the lowest compatible version */ |
756 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 757 | conn->minor = reply.minor; |
d3e2ba59 | 758 | } else { |
58eb9381 | 759 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
760 | } |
761 | ||
c4e361a4 | 762 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 763 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 764 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 765 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
766 | } else { |
767 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
768 | ret = -1; | |
769 | goto end; | |
770 | } | |
771 | ||
772 | reply.major = htobe32(reply.major); | |
773 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 774 | if (conn->type == RELAY_VIEWER_COMMAND) { |
93b4787b | 775 | /* |
5a693d30 MD |
776 | * Increment outside of htobe64 macro, because the argument can |
777 | * be used more than once within the macro, and thus the | |
778 | * operation may be undefined. | |
93b4787b | 779 | */ |
5a693d30 | 780 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
93b4787b | 781 | last_relay_viewer_session_id++; |
5a693d30 | 782 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
93b4787b | 783 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 784 | } |
eea7556c MD |
785 | |
786 | health_code_update(); | |
787 | ||
58eb9381 | 788 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 789 | if (ret < 0) { |
2f8f53af | 790 | goto end; |
d3e2ba59 JD |
791 | } |
792 | ||
eea7556c MD |
793 | health_code_update(); |
794 | ||
58eb9381 | 795 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
796 | ret = 0; |
797 | ||
798 | end: | |
799 | return ret; | |
800 | } | |
801 | ||
802 | /* | |
803 | * Send the viewer the list of current sessions. | |
5a693d30 MD |
804 | * We need to create a copy of the hash table content because otherwise |
805 | * we cannot assume the number of entries stays the same between getting | |
806 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
807 | * |
808 | * Return 0 on success or else a negative value. | |
809 | */ | |
810 | static | |
58eb9381 | 811 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 JD |
812 | { |
813 | int ret; | |
814 | struct lttng_viewer_list_sessions session_list; | |
d3e2ba59 | 815 | struct lttng_ht_iter iter; |
d3e2ba59 | 816 | struct relay_session *session; |
5a693d30 MD |
817 | struct lttng_viewer_session *send_session_buf = NULL; |
818 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; | |
819 | uint32_t count = 0; | |
d3e2ba59 JD |
820 | |
821 | DBG("List sessions received"); | |
822 | ||
5a693d30 MD |
823 | send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf)); |
824 | if (!send_session_buf) { | |
825 | return -1; | |
d3e2ba59 JD |
826 | } |
827 | ||
5a693d30 MD |
828 | rcu_read_lock(); |
829 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, | |
2f8f53af | 830 | session_n.node) { |
5a693d30 | 831 | struct lttng_viewer_session *send_session; |
d3e2ba59 | 832 | |
eea7556c MD |
833 | health_code_update(); |
834 | ||
5a693d30 MD |
835 | if (count >= buf_count) { |
836 | struct lttng_viewer_session *newbuf; | |
837 | uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 838 | |
5a693d30 MD |
839 | newbuf = realloc(send_session_buf, |
840 | new_buf_count * sizeof(*send_session_buf)); | |
841 | if (!newbuf) { | |
842 | ret = -1; | |
843 | rcu_read_unlock(); | |
844 | goto end_free; | |
845 | } | |
846 | send_session_buf = newbuf; | |
847 | buf_count = new_buf_count; | |
6763619c | 848 | } |
5a693d30 | 849 | send_session = &send_session_buf[count]; |
f8e4ddb3 MD |
850 | if (lttng_strncpy(send_session->session_name, |
851 | session->session_name, | |
852 | sizeof(send_session->session_name))) { | |
853 | ret = -1; | |
854 | rcu_read_unlock(); | |
855 | goto end_free; | |
856 | } | |
857 | if (lttng_strncpy(send_session->hostname, session->hostname, | |
858 | sizeof(send_session->hostname))) { | |
859 | ret = -1; | |
860 | rcu_read_unlock(); | |
861 | goto end_free; | |
862 | } | |
5a693d30 MD |
863 | send_session->id = htobe64(session->id); |
864 | send_session->live_timer = htobe32(session->live_timer); | |
865 | if (session->viewer_attached) { | |
866 | send_session->clients = htobe32(1); | |
867 | } else { | |
868 | send_session->clients = htobe32(0); | |
d227d5bd | 869 | } |
5a693d30 MD |
870 | send_session->streams = htobe32(session->stream_count); |
871 | count++; | |
872 | } | |
873 | rcu_read_unlock(); | |
d227d5bd | 874 | |
5a693d30 | 875 | session_list.sessions_count = htobe32(count); |
d227d5bd | 876 | |
5a693d30 | 877 | health_code_update(); |
d227d5bd | 878 | |
5a693d30 MD |
879 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
880 | if (ret < 0) { | |
881 | goto end_free; | |
d227d5bd | 882 | } |
d227d5bd | 883 | |
5a693d30 | 884 | health_code_update(); |
d227d5bd | 885 | |
5a693d30 MD |
886 | ret = send_response(conn->sock, send_session_buf, |
887 | count * sizeof(*send_session_buf)); | |
888 | if (ret < 0) { | |
889 | goto end_free; | |
d227d5bd | 890 | } |
5a693d30 | 891 | health_code_update(); |
d227d5bd | 892 | |
5a693d30 MD |
893 | ret = 0; |
894 | end_free: | |
895 | free(send_session_buf); | |
896 | return ret; | |
d227d5bd JD |
897 | } |
898 | ||
80e8027a | 899 | /* |
5a693d30 | 900 | * Send the viewer the list of current streams. |
80e8027a JD |
901 | */ |
902 | static | |
58eb9381 | 903 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
904 | { |
905 | int ret, send_streams = 0; | |
5a693d30 | 906 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
907 | struct lttng_viewer_new_streams_request request; |
908 | struct lttng_viewer_new_streams_response response; | |
80e8027a | 909 | struct relay_session *session; |
6763619c | 910 | uint64_t session_id; |
47d9f81a | 911 | bool closed = false; |
80e8027a | 912 | |
58eb9381 | 913 | assert(conn); |
80e8027a JD |
914 | |
915 | DBG("Get new streams received"); | |
916 | ||
80e8027a JD |
917 | health_code_update(); |
918 | ||
2f8f53af | 919 | /* Receive the request from the connected client. */ |
58eb9381 | 920 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 921 | if (ret < 0) { |
80e8027a JD |
922 | goto error; |
923 | } | |
6763619c | 924 | session_id = be64toh(request.session_id); |
80e8027a JD |
925 | |
926 | health_code_update(); | |
927 | ||
53efb85a MD |
928 | memset(&response, 0, sizeof(response)); |
929 | ||
5a693d30 | 930 | session = session_get_by_id(session_id); |
2f8f53af | 931 | if (!session) { |
6763619c | 932 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 933 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
934 | goto send_reply; |
935 | } | |
936 | ||
5a693d30 | 937 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
80e8027a | 938 | send_streams = 0; |
c4e361a4 | 939 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
940 | goto send_reply; |
941 | } | |
942 | ||
6763619c JD |
943 | send_streams = 1; |
944 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
945 | ||
5a693d30 | 946 | ret = make_viewer_streams(session, LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent, |
47d9f81a | 947 | &nb_created, &closed); |
2f8f53af | 948 | if (ret < 0) { |
5a693d30 | 949 | goto end_put_session; |
2f8f53af DG |
950 | } |
951 | /* Only send back the newly created streams with the unsent ones. */ | |
952 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
953 | response.streams_count = htobe32(nb_streams); |
954 | ||
4479f682 | 955 | /* |
8cd956bc MD |
956 | * If the session is closed, HUP when there are no more streams |
957 | * with data. | |
4479f682 | 958 | */ |
47d9f81a | 959 | if (closed && nb_total == 0) { |
4479f682 | 960 | send_streams = 0; |
47d9f81a | 961 | response.streams_count = 0; |
4479f682 JD |
962 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
963 | goto send_reply; | |
964 | } | |
965 | ||
80e8027a JD |
966 | send_reply: |
967 | health_code_update(); | |
58eb9381 | 968 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 969 | if (ret < 0) { |
5a693d30 | 970 | goto end_put_session; |
80e8027a JD |
971 | } |
972 | health_code_update(); | |
973 | ||
974 | /* | |
5a693d30 MD |
975 | * Unknown or empty session, just return gracefully, the viewer |
976 | * knows what is happening. | |
80e8027a JD |
977 | */ |
978 | if (!send_streams || !nb_streams) { | |
979 | ret = 0; | |
5a693d30 | 980 | goto end_put_session; |
80e8027a JD |
981 | } |
982 | ||
2f8f53af | 983 | /* |
5a693d30 MD |
984 | * Send stream and *DON'T* ignore the sent flag so every viewer |
985 | * streams that were not sent from that point will be sent to | |
986 | * the viewer. | |
2f8f53af | 987 | */ |
58eb9381 | 988 | ret = send_viewer_streams(conn->sock, session, 0); |
2f8f53af | 989 | if (ret < 0) { |
5a693d30 | 990 | goto end_put_session; |
80e8027a JD |
991 | } |
992 | ||
5a693d30 MD |
993 | end_put_session: |
994 | if (session) { | |
995 | session_put(session); | |
996 | } | |
80e8027a JD |
997 | error: |
998 | return ret; | |
999 | } | |
1000 | ||
d3e2ba59 JD |
1001 | /* |
1002 | * Send the viewer the list of current sessions. | |
1003 | */ | |
1004 | static | |
58eb9381 | 1005 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 1006 | { |
2f8f53af DG |
1007 | int send_streams = 0; |
1008 | ssize_t ret; | |
80e8027a | 1009 | uint32_t nb_streams = 0; |
2f8f53af | 1010 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
1011 | struct lttng_viewer_attach_session_request request; |
1012 | struct lttng_viewer_attach_session_response response; | |
5a693d30 | 1013 | struct relay_session *session = NULL; |
47d9f81a | 1014 | bool closed = false; |
d3e2ba59 | 1015 | |
58eb9381 | 1016 | assert(conn); |
d3e2ba59 | 1017 | |
eea7556c MD |
1018 | health_code_update(); |
1019 | ||
2f8f53af | 1020 | /* Receive the request from the connected client. */ |
58eb9381 | 1021 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1022 | if (ret < 0) { |
d3e2ba59 JD |
1023 | goto error; |
1024 | } | |
1025 | ||
eea7556c MD |
1026 | health_code_update(); |
1027 | ||
53efb85a MD |
1028 | memset(&response, 0, sizeof(response)); |
1029 | ||
c3b7390b JD |
1030 | if (!conn->viewer_session) { |
1031 | DBG("Client trying to attach before creating a live viewer session"); | |
1032 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
1033 | goto send_reply; | |
1034 | } | |
1035 | ||
5a693d30 | 1036 | session = session_get_by_id(be64toh(request.session_id)); |
2f8f53af | 1037 | if (!session) { |
d3e2ba59 JD |
1038 | DBG("Relay session %" PRIu64 " not found", |
1039 | be64toh(request.session_id)); | |
c4e361a4 | 1040 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
1041 | goto send_reply; |
1042 | } | |
5a693d30 MD |
1043 | DBG("Attach session ID %" PRIu64 " received", |
1044 | be64toh(request.session_id)); | |
d3e2ba59 | 1045 | |
5a693d30 | 1046 | if (session->live_timer == 0) { |
d3e2ba59 | 1047 | DBG("Not live session"); |
c4e361a4 | 1048 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 | 1049 | goto send_reply; |
5a693d30 MD |
1050 | } |
1051 | ||
1052 | send_streams = 1; | |
1053 | ret = viewer_session_attach(conn->viewer_session, session); | |
1054 | if (ret) { | |
1055 | DBG("Already a viewer attached"); | |
1056 | response.status = htobe32(LTTNG_VIEWER_ATTACH_ALREADY); | |
1057 | goto send_reply; | |
d3e2ba59 JD |
1058 | } |
1059 | ||
1060 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1061 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1062 | case LTTNG_VIEWER_SEEK_LAST: | |
5a693d30 | 1063 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
2f8f53af | 1064 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
1065 | break; |
1066 | default: | |
1067 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1068 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1069 | send_streams = 0; |
1070 | goto send_reply; | |
1071 | } | |
1072 | ||
47d9f81a MD |
1073 | ret = make_viewer_streams(session, seek_type, &nb_streams, NULL, |
1074 | NULL, &closed); | |
2f8f53af | 1075 | if (ret < 0) { |
5a693d30 | 1076 | goto end_put_session; |
d3e2ba59 | 1077 | } |
2f8f53af | 1078 | response.streams_count = htobe32(nb_streams); |
d3e2ba59 | 1079 | |
47d9f81a MD |
1080 | /* |
1081 | * If the session is closed when the viewer is attaching, it | |
1082 | * means some of the streams may have been concurrently removed, | |
1083 | * so we don't allow the viewer to attach, even if there are | |
1084 | * streams available. | |
1085 | */ | |
1086 | if (closed) { | |
1087 | send_streams = 0; | |
1088 | response.streams_count = 0; | |
1089 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); | |
1090 | goto send_reply; | |
1091 | } | |
1092 | ||
d3e2ba59 | 1093 | send_reply: |
eea7556c | 1094 | health_code_update(); |
58eb9381 | 1095 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1096 | if (ret < 0) { |
5a693d30 | 1097 | goto end_put_session; |
d3e2ba59 | 1098 | } |
eea7556c | 1099 | health_code_update(); |
d3e2ba59 JD |
1100 | |
1101 | /* | |
5a693d30 MD |
1102 | * Unknown or empty session, just return gracefully, the viewer |
1103 | * knows what is happening. | |
d3e2ba59 | 1104 | */ |
157df586 | 1105 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1106 | ret = 0; |
5a693d30 | 1107 | goto end_put_session; |
d3e2ba59 JD |
1108 | } |
1109 | ||
2f8f53af | 1110 | /* Send stream and ignore the sent flag. */ |
58eb9381 | 1111 | ret = send_viewer_streams(conn->sock, session, 1); |
2f8f53af | 1112 | if (ret < 0) { |
5a693d30 | 1113 | goto end_put_session; |
d3e2ba59 | 1114 | } |
d3e2ba59 | 1115 | |
5a693d30 MD |
1116 | end_put_session: |
1117 | if (session) { | |
1118 | session_put(session); | |
1119 | } | |
4a9daf17 JD |
1120 | error: |
1121 | return ret; | |
1122 | } | |
1123 | ||
878c34cf DG |
1124 | /* |
1125 | * Open the index file if needed for the given vstream. | |
1126 | * | |
5a693d30 MD |
1127 | * If an index file is successfully opened, the vstream index_fd set with |
1128 | * it. | |
878c34cf DG |
1129 | * |
1130 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
5a693d30 MD |
1131 | * |
1132 | * Called with rstream lock held. | |
878c34cf DG |
1133 | */ |
1134 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1135 | struct relay_stream *rstream) | |
1136 | { | |
1137 | int ret = 0; | |
1138 | ||
5a693d30 | 1139 | if (vstream->index_fd) { |
878c34cf DG |
1140 | goto end; |
1141 | } | |
1142 | ||
1143 | /* | |
5a693d30 | 1144 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1145 | */ |
8921c6e4 | 1146 | if (rstream->index_received_seqcount == 0) { |
878c34cf DG |
1147 | ret = -ENOENT; |
1148 | goto end; | |
1149 | } | |
1150 | ret = index_open(vstream->path_name, vstream->channel_name, | |
5a693d30 MD |
1151 | vstream->stream->tracefile_count, |
1152 | vstream->current_tracefile_id); | |
878c34cf | 1153 | if (ret >= 0) { |
5a693d30 MD |
1154 | vstream->index_fd = stream_fd_create(ret); |
1155 | if (!vstream->index_fd) { | |
1156 | if (close(ret)) { | |
1157 | PERROR("close"); | |
1158 | } | |
1159 | ret = -1; | |
1160 | } else { | |
1161 | ret = 0; | |
1162 | } | |
878c34cf DG |
1163 | goto end; |
1164 | } | |
1165 | ||
1166 | end: | |
1167 | return ret; | |
1168 | } | |
1169 | ||
1170 | /* | |
5a693d30 MD |
1171 | * Check the status of the index for the given stream. This function |
1172 | * updates the index structure if needed and can put (close) the vstream | |
1173 | * in the HUP situation. | |
1174 | * | |
1175 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1176 | * that the index has been updated and is ready to be sent to the | |
1177 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1178 | * |
5a693d30 | 1179 | * Called with rstream lock held. |
878c34cf DG |
1180 | */ |
1181 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1182 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1183 | struct lttng_viewer_index *index) | |
1184 | { | |
1185 | int ret; | |
1186 | ||
5a693d30 | 1187 | if (trace->session->connection_closed |
8921c6e4 MD |
1188 | && rstream->index_received_seqcount |
1189 | == vstream->index_sent_seqcount) { | |
5a693d30 MD |
1190 | /* Last index sent and session connection is closed. */ |
1191 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1192 | goto hup; | |
1193 | } else if (rstream->beacon_ts_end != -1ULL && | |
8921c6e4 MD |
1194 | rstream->index_received_seqcount |
1195 | == vstream->index_sent_seqcount) { | |
5a693d30 MD |
1196 | /* |
1197 | * We've received a synchronization beacon and the last index | |
1198 | * available has been sent, the index for now is inactive. | |
1199 | * | |
1200 | * In this case, we have received a beacon which allows us to | |
1201 | * inform the client of a time interval during which we can | |
1202 | * guarantee that there are no events to read (and never will | |
1203 | * be). | |
1204 | */ | |
1205 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1206 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1207 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
1208 | goto index_ready; | |
8921c6e4 MD |
1209 | } else if (rstream->index_received_seqcount |
1210 | == vstream->index_sent_seqcount) { | |
5a693d30 | 1211 | /* |
8921c6e4 MD |
1212 | * This checks whether received == sent seqcount. In |
1213 | * this case, we have not received a beacon. Therefore, | |
1214 | * we can only ask the client to retry later. | |
5a693d30 MD |
1215 | */ |
1216 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1217 | goto index_ready; | |
8921c6e4 MD |
1218 | } else if (!tracefile_array_seq_in_file(rstream->tfa, |
1219 | vstream->current_tracefile_id, | |
1220 | vstream->index_sent_seqcount)) { | |
5a693d30 | 1221 | /* |
8921c6e4 MD |
1222 | * The next index we want to send cannot be read either |
1223 | * because we need to perform a rotation, or due to | |
1224 | * the producer having overwritten its trace file. | |
5a693d30 | 1225 | */ |
8921c6e4 | 1226 | DBG("Viewer stream %" PRIu64 " rotation", |
5a693d30 MD |
1227 | vstream->stream->stream_handle); |
1228 | ret = viewer_stream_rotate(vstream); | |
1229 | if (ret < 0) { | |
1230 | goto end; | |
1231 | } else if (ret == 1) { | |
1232 | /* EOF across entire stream. */ | |
1233 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1234 | goto hup; | |
1235 | } | |
5a693d30 | 1236 | /* |
8921c6e4 MD |
1237 | * If we have been pushed due to overwrite, it |
1238 | * necessarily means there is data that can be read in | |
1239 | * the stream. If we rotated because we reached the end | |
1240 | * of a tracefile, it means the following tracefile | |
1241 | * needs to contain at least one index, else we would | |
1242 | * have already returned LTTNG_VIEWER_INDEX_RETRY to the | |
1243 | * viewer. The updated index_sent_seqcount needs to | |
1244 | * point to a readable index entry now. | |
1245 | * | |
1246 | * In the case where we "rotate" on a single file, we | |
1247 | * can end up in a case where the requested index is | |
1248 | * still unavailable. | |
5a693d30 | 1249 | */ |
8921c6e4 MD |
1250 | if (rstream->tracefile_count == 1 && |
1251 | !tracefile_array_seq_in_file( | |
1252 | rstream->tfa, | |
1253 | vstream->current_tracefile_id, | |
1254 | vstream->index_sent_seqcount)) { | |
1255 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1256 | goto index_ready; | |
878c34cf | 1257 | } |
8921c6e4 MD |
1258 | assert(tracefile_array_seq_in_file(rstream->tfa, |
1259 | vstream->current_tracefile_id, | |
1260 | vstream->index_sent_seqcount)); | |
878c34cf | 1261 | } |
8921c6e4 MD |
1262 | /* ret == 0 means successful so we continue. */ |
1263 | ret = 0; | |
5a693d30 | 1264 | end: |
878c34cf DG |
1265 | return ret; |
1266 | ||
1267 | hup: | |
5a693d30 | 1268 | viewer_stream_put(vstream); |
878c34cf DG |
1269 | index_ready: |
1270 | return 1; | |
1271 | } | |
1272 | ||
d3e2ba59 JD |
1273 | /* |
1274 | * Send the next index for a stream. | |
1275 | * | |
1276 | * Return 0 on success or else a negative value. | |
1277 | */ | |
1278 | static | |
58eb9381 | 1279 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1280 | { |
1281 | int ret; | |
878c34cf | 1282 | ssize_t read_ret; |
d3e2ba59 JD |
1283 | struct lttng_viewer_get_next_index request_index; |
1284 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1285 | struct ctf_packet_index packet_index; |
5a693d30 MD |
1286 | struct relay_viewer_stream *vstream = NULL; |
1287 | struct relay_stream *rstream = NULL; | |
1288 | struct ctf_trace *ctf_trace = NULL; | |
1289 | struct relay_viewer_stream *metadata_viewer_stream = NULL; | |
d3e2ba59 | 1290 | |
58eb9381 | 1291 | assert(conn); |
d3e2ba59 JD |
1292 | |
1293 | DBG("Viewer get next index"); | |
1294 | ||
5a693d30 | 1295 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1296 | health_code_update(); |
2f8f53af | 1297 | |
58eb9381 | 1298 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1299 | if (ret < 0) { |
d3e2ba59 JD |
1300 | goto end; |
1301 | } | |
eea7556c | 1302 | health_code_update(); |
d3e2ba59 | 1303 | |
5a693d30 | 1304 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1305 | if (!vstream) { |
8921c6e4 MD |
1306 | DBG("Client requested index of unknown stream id %" PRIu64, |
1307 | be64toh(request_index.stream_id)); | |
72dffa35 MD |
1308 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1309 | goto send_reply; | |
2a174661 DG |
1310 | } |
1311 | ||
5a693d30 MD |
1312 | /* Use back. ref. Protected by refcounts. */ |
1313 | rstream = vstream->stream; | |
1314 | ctf_trace = rstream->trace; | |
d3e2ba59 | 1315 | |
5a693d30 MD |
1316 | /* metadata_viewer_stream may be NULL. */ |
1317 | metadata_viewer_stream = | |
1318 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
2a174661 | 1319 | |
5a693d30 | 1320 | pthread_mutex_lock(&rstream->lock); |
d3e2ba59 JD |
1321 | |
1322 | /* | |
1323 | * The viewer should not ask for index on metadata stream. | |
1324 | */ | |
5a693d30 | 1325 | if (rstream->is_metadata) { |
c4e361a4 | 1326 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
d3e2ba59 JD |
1327 | goto send_reply; |
1328 | } | |
1329 | ||
878c34cf DG |
1330 | /* Try to open an index if one is needed for that stream. */ |
1331 | ret = try_open_index(vstream, rstream); | |
1332 | if (ret < 0) { | |
0e6830aa | 1333 | if (ret == -ENOENT) { |
d3e2ba59 | 1334 | /* |
5a693d30 MD |
1335 | * The index is created only when the first data |
1336 | * packet arrives, it might not be ready at the | |
1337 | * beginning of the session | |
d3e2ba59 | 1338 | */ |
c4e361a4 | 1339 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); |
878c34cf DG |
1340 | } else { |
1341 | /* Unhandled error. */ | |
c4e361a4 | 1342 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
d3e2ba59 | 1343 | } |
878c34cf | 1344 | goto send_reply; |
d3e2ba59 JD |
1345 | } |
1346 | ||
878c34cf | 1347 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
878c34cf | 1348 | if (ret < 0) { |
5a693d30 | 1349 | goto error_put; |
878c34cf DG |
1350 | } else if (ret == 1) { |
1351 | /* | |
5a693d30 MD |
1352 | * We have no index to send and check_index_status has populated |
1353 | * viewer_index's status. | |
878c34cf | 1354 | */ |
d3e2ba59 JD |
1355 | goto send_reply; |
1356 | } | |
5a693d30 | 1357 | /* At this point, ret is 0 thus we will be able to read the index. */ |
878c34cf | 1358 | assert(!ret); |
d3e2ba59 | 1359 | |
5a693d30 MD |
1360 | /* |
1361 | * vstream->stream_fd may be NULL if it has been closed by | |
1362 | * tracefile rotation, or if we are at the beginning of the | |
1363 | * stream. We open the data stream file here to protect against | |
1364 | * overwrite caused by tracefile rotation (in association with | |
1365 | * unlink performed before overwrite). | |
1366 | */ | |
1367 | if (!vstream->stream_fd) { | |
1368 | char fullpath[PATH_MAX]; | |
1369 | ||
1370 | if (vstream->stream->tracefile_count > 0) { | |
1371 | ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64, | |
1372 | vstream->path_name, | |
1373 | vstream->channel_name, | |
1374 | vstream->current_tracefile_id); | |
1375 | } else { | |
1376 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", | |
1377 | vstream->path_name, | |
1378 | vstream->channel_name); | |
1379 | } | |
1380 | if (ret < 0) { | |
1381 | goto error_put; | |
1382 | } | |
1383 | ret = open(fullpath, O_RDONLY); | |
1384 | if (ret < 0) { | |
1385 | PERROR("Relay opening trace file"); | |
1386 | goto error_put; | |
1387 | } | |
1388 | vstream->stream_fd = stream_fd_create(ret); | |
1389 | if (!vstream->stream_fd) { | |
1390 | if (close(ret)) { | |
1391 | PERROR("close"); | |
1392 | } | |
1393 | goto error_put; | |
1394 | } | |
d3e2ba59 JD |
1395 | } |
1396 | ||
f04a971b | 1397 | ret = check_new_streams(conn); |
4a9daf17 | 1398 | if (ret < 0) { |
5a693d30 MD |
1399 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1400 | goto send_reply; | |
4a9daf17 JD |
1401 | } else if (ret == 1) { |
1402 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1403 | } | |
1404 | ||
5a693d30 | 1405 | read_ret = lttng_read(vstream->index_fd->fd, &packet_index, |
6cd525e8 | 1406 | sizeof(packet_index)); |
5a693d30 MD |
1407 | if (read_ret < sizeof(packet_index)) { |
1408 | ERR("Relay reading index file %d returned %zd", | |
1409 | vstream->index_fd->fd, read_ret); | |
1410 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); | |
6b6b9a5a | 1411 | goto send_reply; |
d3e2ba59 | 1412 | } else { |
c4e361a4 | 1413 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
8921c6e4 | 1414 | vstream->index_sent_seqcount++; |
d3e2ba59 JD |
1415 | } |
1416 | ||
1417 | /* | |
1418 | * Indexes are stored in big endian, no need to switch before sending. | |
1419 | */ | |
5a693d30 MD |
1420 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
1421 | rstream->stream_handle, | |
1422 | be64toh(packet_index.offset)); | |
d3e2ba59 JD |
1423 | viewer_index.offset = packet_index.offset; |
1424 | viewer_index.packet_size = packet_index.packet_size; | |
1425 | viewer_index.content_size = packet_index.content_size; | |
1426 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1427 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1428 | viewer_index.events_discarded = packet_index.events_discarded; | |
1429 | viewer_index.stream_id = packet_index.stream_id; | |
1430 | ||
1431 | send_reply: | |
72dffa35 MD |
1432 | if (rstream) { |
1433 | pthread_mutex_unlock(&rstream->lock); | |
1434 | } | |
5a693d30 MD |
1435 | |
1436 | if (metadata_viewer_stream) { | |
1437 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
1438 | DBG("get next index metadata check: recv %" PRIu64 | |
1439 | " sent %" PRIu64, | |
1440 | metadata_viewer_stream->stream->metadata_received, | |
1441 | metadata_viewer_stream->metadata_sent); | |
1442 | if (!metadata_viewer_stream->stream->metadata_received || | |
1443 | metadata_viewer_stream->stream->metadata_received > | |
1444 | metadata_viewer_stream->metadata_sent) { | |
1445 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1446 | } | |
1447 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
1448 | } | |
1449 | ||
d3e2ba59 | 1450 | viewer_index.flags = htobe32(viewer_index.flags); |
eea7556c | 1451 | health_code_update(); |
2f8f53af | 1452 | |
58eb9381 | 1453 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1454 | if (ret < 0) { |
5a693d30 | 1455 | goto end; |
d3e2ba59 | 1456 | } |
eea7556c | 1457 | health_code_update(); |
d3e2ba59 | 1458 | |
bdb11f09 MD |
1459 | if (vstream) { |
1460 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", | |
8921c6e4 | 1461 | vstream->index_sent_seqcount, |
bdb11f09 MD |
1462 | vstream->stream->stream_handle); |
1463 | } | |
d3e2ba59 | 1464 | end: |
5a693d30 MD |
1465 | if (metadata_viewer_stream) { |
1466 | viewer_stream_put(metadata_viewer_stream); | |
1467 | } | |
1468 | if (vstream) { | |
1469 | viewer_stream_put(vstream); | |
1470 | } | |
1471 | return ret; | |
1472 | ||
1473 | error_put: | |
1474 | pthread_mutex_unlock(&rstream->lock); | |
1475 | if (metadata_viewer_stream) { | |
1476 | viewer_stream_put(metadata_viewer_stream); | |
1477 | } | |
1478 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
1479 | return ret; |
1480 | } | |
1481 | ||
1482 | /* | |
1483 | * Send the next index for a stream | |
1484 | * | |
1485 | * Return 0 on success or else a negative value. | |
1486 | */ | |
1487 | static | |
58eb9381 | 1488 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 JD |
1489 | { |
1490 | int ret, send_data = 0; | |
1491 | char *data = NULL; | |
1492 | uint32_t len = 0; | |
1493 | ssize_t read_len; | |
1494 | struct lttng_viewer_get_packet get_packet_info; | |
1495 | struct lttng_viewer_trace_packet reply; | |
5a693d30 | 1496 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 JD |
1497 | |
1498 | DBG2("Relay get data packet"); | |
1499 | ||
eea7556c | 1500 | health_code_update(); |
2f8f53af | 1501 | |
5a693d30 MD |
1502 | ret = recv_request(conn->sock, &get_packet_info, |
1503 | sizeof(get_packet_info)); | |
2f8f53af | 1504 | if (ret < 0) { |
d3e2ba59 JD |
1505 | goto end; |
1506 | } | |
eea7556c | 1507 | health_code_update(); |
d3e2ba59 | 1508 | |
0233a6a5 DG |
1509 | /* From this point on, the error label can be reached. */ |
1510 | memset(&reply, 0, sizeof(reply)); | |
1511 | ||
5a693d30 MD |
1512 | vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id)); |
1513 | if (!vstream) { | |
8921c6e4 MD |
1514 | DBG("Client requested packet of unknown stream id %" PRIu64, |
1515 | be64toh(get_packet_info.stream_id)); | |
78e607b7 MD |
1516 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
1517 | goto send_reply_nolock; | |
d3e2ba59 | 1518 | } |
2a174661 | 1519 | |
5a693d30 | 1520 | pthread_mutex_lock(&vstream->stream->lock); |
4a9daf17 | 1521 | |
d3e2ba59 JD |
1522 | len = be32toh(get_packet_info.len); |
1523 | data = zmalloc(len); | |
1524 | if (!data) { | |
1525 | PERROR("relay data zmalloc"); | |
1526 | goto error; | |
1527 | } | |
1528 | ||
5a693d30 MD |
1529 | ret = lseek(vstream->stream_fd->fd, be64toh(get_packet_info.offset), |
1530 | SEEK_SET); | |
d3e2ba59 | 1531 | if (ret < 0) { |
5a693d30 MD |
1532 | PERROR("lseek fd %d to offset %" PRIu64, vstream->stream_fd->fd, |
1533 | be64toh(get_packet_info.offset)); | |
1534 | goto error; | |
d3e2ba59 | 1535 | } |
5a693d30 | 1536 | read_len = lttng_read(vstream->stream_fd->fd, data, len); |
6cd525e8 | 1537 | if (read_len < len) { |
5a693d30 MD |
1538 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, |
1539 | vstream->stream_fd->fd, | |
1540 | be64toh(get_packet_info.offset)); | |
1541 | goto error; | |
d3e2ba59 | 1542 | } |
c4e361a4 | 1543 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
d3e2ba59 JD |
1544 | reply.len = htobe32(len); |
1545 | send_data = 1; | |
1546 | goto send_reply; | |
1547 | ||
1548 | error: | |
c4e361a4 | 1549 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1550 | |
1551 | send_reply: | |
5a693d30 MD |
1552 | if (vstream) { |
1553 | pthread_mutex_unlock(&vstream->stream->lock); | |
1554 | } | |
1555 | send_reply_nolock: | |
d3e2ba59 | 1556 | reply.flags = htobe32(reply.flags); |
eea7556c MD |
1557 | |
1558 | health_code_update(); | |
2f8f53af | 1559 | |
58eb9381 | 1560 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1561 | if (ret < 0) { |
5a693d30 | 1562 | goto end_free; |
d3e2ba59 | 1563 | } |
eea7556c | 1564 | health_code_update(); |
d3e2ba59 JD |
1565 | |
1566 | if (send_data) { | |
eea7556c | 1567 | health_code_update(); |
58eb9381 | 1568 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1569 | if (ret < 0) { |
5a693d30 | 1570 | goto end_free; |
d3e2ba59 | 1571 | } |
eea7556c | 1572 | health_code_update(); |
d3e2ba59 JD |
1573 | } |
1574 | ||
1575 | DBG("Sent %u bytes for stream %" PRIu64, len, | |
1576 | be64toh(get_packet_info.stream_id)); | |
1577 | ||
5a693d30 | 1578 | end_free: |
d3e2ba59 | 1579 | free(data); |
d3e2ba59 | 1580 | end: |
5a693d30 MD |
1581 | if (vstream) { |
1582 | viewer_stream_put(vstream); | |
1583 | } | |
d3e2ba59 JD |
1584 | return ret; |
1585 | } | |
1586 | ||
1587 | /* | |
1588 | * Send the session's metadata | |
1589 | * | |
1590 | * Return 0 on success else a negative value. | |
1591 | */ | |
1592 | static | |
58eb9381 | 1593 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1594 | { |
1595 | int ret = 0; | |
1596 | ssize_t read_len; | |
1597 | uint64_t len = 0; | |
1598 | char *data = NULL; | |
1599 | struct lttng_viewer_get_metadata request; | |
1600 | struct lttng_viewer_metadata_packet reply; | |
5a693d30 | 1601 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 | 1602 | |
58eb9381 | 1603 | assert(conn); |
d3e2ba59 JD |
1604 | |
1605 | DBG("Relay get metadata"); | |
1606 | ||
eea7556c | 1607 | health_code_update(); |
2f8f53af | 1608 | |
58eb9381 | 1609 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1610 | if (ret < 0) { |
d3e2ba59 JD |
1611 | goto end; |
1612 | } | |
eea7556c | 1613 | health_code_update(); |
d3e2ba59 | 1614 | |
53efb85a MD |
1615 | memset(&reply, 0, sizeof(reply)); |
1616 | ||
5a693d30 MD |
1617 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
1618 | if (!vstream) { | |
16d6d62d MD |
1619 | /* |
1620 | * The metadata stream can be closed by a CLOSE command | |
1621 | * just before we attach. It can also be closed by | |
1622 | * per-pid tracing during tracing. Therefore, it is | |
1623 | * possible that we cannot find this viewer stream. | |
1624 | * Reply back to the client with an error if we cannot | |
1625 | * find it. | |
1626 | */ | |
8921c6e4 MD |
1627 | DBG("Client requested metadata of unknown stream id %" PRIu64, |
1628 | be64toh(request.stream_id)); | |
16d6d62d | 1629 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
5a693d30 | 1630 | goto send_reply; |
d3e2ba59 | 1631 | } |
5a693d30 MD |
1632 | pthread_mutex_lock(&vstream->stream->lock); |
1633 | if (!vstream->stream->is_metadata) { | |
1634 | ERR("Invalid metadata stream"); | |
6763619c JD |
1635 | goto error; |
1636 | } | |
1637 | ||
5a693d30 | 1638 | assert(vstream->metadata_sent <= vstream->stream->metadata_received); |
2a174661 | 1639 | |
5a693d30 | 1640 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
d3e2ba59 | 1641 | if (len == 0) { |
c4e361a4 | 1642 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
d3e2ba59 JD |
1643 | goto send_reply; |
1644 | } | |
1645 | ||
1646 | /* first time, we open the metadata file */ | |
5a693d30 | 1647 | if (!vstream->stream_fd) { |
d3e2ba59 JD |
1648 | char fullpath[PATH_MAX]; |
1649 | ||
5a693d30 MD |
1650 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", vstream->path_name, |
1651 | vstream->channel_name); | |
d3e2ba59 JD |
1652 | if (ret < 0) { |
1653 | goto error; | |
1654 | } | |
1655 | ret = open(fullpath, O_RDONLY); | |
1656 | if (ret < 0) { | |
1657 | PERROR("Relay opening metadata file"); | |
1658 | goto error; | |
1659 | } | |
5a693d30 MD |
1660 | vstream->stream_fd = stream_fd_create(ret); |
1661 | if (!vstream->stream_fd) { | |
1662 | if (close(ret)) { | |
1663 | PERROR("close"); | |
1664 | } | |
1665 | goto error; | |
1666 | } | |
d3e2ba59 JD |
1667 | } |
1668 | ||
1669 | reply.len = htobe64(len); | |
1670 | data = zmalloc(len); | |
1671 | if (!data) { | |
1672 | PERROR("viewer metadata zmalloc"); | |
1673 | goto error; | |
1674 | } | |
1675 | ||
5a693d30 | 1676 | read_len = lttng_read(vstream->stream_fd->fd, data, len); |
6cd525e8 | 1677 | if (read_len < len) { |
d3e2ba59 JD |
1678 | PERROR("Relay reading metadata file"); |
1679 | goto error; | |
1680 | } | |
5a693d30 MD |
1681 | vstream->metadata_sent += read_len; |
1682 | if (vstream->metadata_sent == vstream->stream->metadata_received | |
1683 | && vstream->stream->closed) { | |
1684 | /* Release ownership for the viewer metadata stream. */ | |
1685 | viewer_stream_put(vstream); | |
1686 | } | |
1687 | ||
c4e361a4 | 1688 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
5a693d30 | 1689 | |
d3e2ba59 JD |
1690 | goto send_reply; |
1691 | ||
1692 | error: | |
c4e361a4 | 1693 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
1694 | |
1695 | send_reply: | |
eea7556c | 1696 | health_code_update(); |
5a693d30 MD |
1697 | if (vstream) { |
1698 | pthread_mutex_unlock(&vstream->stream->lock); | |
1699 | } | |
58eb9381 | 1700 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1701 | if (ret < 0) { |
5a693d30 | 1702 | goto end_free; |
d3e2ba59 | 1703 | } |
eea7556c | 1704 | health_code_update(); |
d3e2ba59 JD |
1705 | |
1706 | if (len > 0) { | |
58eb9381 | 1707 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1708 | if (ret < 0) { |
5a693d30 | 1709 | goto end_free; |
d3e2ba59 JD |
1710 | } |
1711 | } | |
1712 | ||
1713 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
1714 | be64toh(request.stream_id)); | |
1715 | ||
1716 | DBG("Metadata sent"); | |
1717 | ||
5a693d30 | 1718 | end_free: |
d3e2ba59 | 1719 | free(data); |
d3e2ba59 | 1720 | end: |
5a693d30 MD |
1721 | if (vstream) { |
1722 | viewer_stream_put(vstream); | |
1723 | } | |
d3e2ba59 JD |
1724 | return ret; |
1725 | } | |
1726 | ||
c3b7390b JD |
1727 | /* |
1728 | * Create a viewer session. | |
1729 | * | |
1730 | * Return 0 on success or else a negative value. | |
1731 | */ | |
1732 | static | |
1733 | int viewer_create_session(struct relay_connection *conn) | |
1734 | { | |
1735 | int ret; | |
1736 | struct lttng_viewer_create_session_response resp; | |
1737 | ||
1738 | DBG("Viewer create session received"); | |
1739 | ||
53efb85a | 1740 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 1741 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
5a693d30 | 1742 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
1743 | if (!conn->viewer_session) { |
1744 | ERR("Allocation viewer session"); | |
1745 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
1746 | goto send_reply; | |
1747 | } | |
c3b7390b JD |
1748 | |
1749 | send_reply: | |
1750 | health_code_update(); | |
1751 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
1752 | if (ret < 0) { | |
1753 | goto end; | |
1754 | } | |
1755 | health_code_update(); | |
1756 | ret = 0; | |
1757 | ||
1758 | end: | |
1759 | return ret; | |
1760 | } | |
1761 | ||
1762 | ||
d3e2ba59 JD |
1763 | /* |
1764 | * live_relay_unknown_command: send -1 if received unknown command | |
1765 | */ | |
1766 | static | |
58eb9381 | 1767 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
1768 | { |
1769 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 1770 | |
53efb85a | 1771 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 1772 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 1773 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
1774 | } |
1775 | ||
1776 | /* | |
1777 | * Process the commands received on the control socket | |
1778 | */ | |
1779 | static | |
1780 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 1781 | struct relay_connection *conn) |
d3e2ba59 JD |
1782 | { |
1783 | int ret = 0; | |
2f8f53af DG |
1784 | uint32_t msg_value; |
1785 | ||
2f8f53af DG |
1786 | msg_value = be32toh(recv_hdr->cmd); |
1787 | ||
1788 | /* | |
1789 | * Make sure we've done the version check before any command other then a | |
1790 | * new client connection. | |
1791 | */ | |
c4e361a4 | 1792 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 1793 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
1794 | ret = -1; |
1795 | goto end; | |
1796 | } | |
d3e2ba59 | 1797 | |
2f8f53af | 1798 | switch (msg_value) { |
c4e361a4 | 1799 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 1800 | ret = viewer_connect(conn); |
d3e2ba59 | 1801 | break; |
c4e361a4 | 1802 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 1803 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 1804 | break; |
c4e361a4 | 1805 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 1806 | ret = viewer_attach_session(conn); |
d3e2ba59 | 1807 | break; |
c4e361a4 | 1808 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 1809 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 1810 | break; |
c4e361a4 | 1811 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 1812 | ret = viewer_get_packet(conn); |
d3e2ba59 | 1813 | break; |
c4e361a4 | 1814 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 1815 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 1816 | break; |
c4e361a4 | 1817 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 1818 | ret = viewer_get_new_streams(conn); |
80e8027a | 1819 | break; |
c3b7390b JD |
1820 | case LTTNG_VIEWER_CREATE_SESSION: |
1821 | ret = viewer_create_session(conn); | |
1822 | break; | |
d3e2ba59 | 1823 | default: |
5a693d30 MD |
1824 | ERR("Received unknown viewer command (%u)", |
1825 | be32toh(recv_hdr->cmd)); | |
58eb9381 | 1826 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
1827 | ret = -1; |
1828 | goto end; | |
1829 | } | |
1830 | ||
1831 | end: | |
1832 | return ret; | |
1833 | } | |
1834 | ||
1835 | static | |
58eb9381 | 1836 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
1837 | { |
1838 | int ret; | |
1839 | ||
58eb9381 | 1840 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 JD |
1841 | |
1842 | ret = close(pollfd); | |
1843 | if (ret < 0) { | |
1844 | ERR("Closing pollfd %d", pollfd); | |
1845 | } | |
1846 | } | |
1847 | ||
d3e2ba59 JD |
1848 | /* |
1849 | * This thread does the actual work | |
1850 | */ | |
1851 | static | |
1852 | void *thread_worker(void *data) | |
1853 | { | |
1854 | int ret, err = -1; | |
1855 | uint32_t nb_fd; | |
d3e2ba59 | 1856 | struct lttng_poll_event events; |
5a693d30 | 1857 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 JD |
1858 | struct lttng_ht_iter iter; |
1859 | struct lttng_viewer_cmd recv_hdr; | |
302d8906 | 1860 | struct relay_connection *destroy_conn; |
d3e2ba59 JD |
1861 | |
1862 | DBG("[thread] Live viewer relay worker started"); | |
1863 | ||
1864 | rcu_register_thread(); | |
1865 | ||
eea7556c MD |
1866 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
1867 | ||
9b5e0863 MD |
1868 | if (testpoint(relayd_thread_live_worker)) { |
1869 | goto error_testpoint; | |
1870 | } | |
1871 | ||
d3e2ba59 | 1872 | /* table of connections indexed on socket */ |
5a693d30 MD |
1873 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1874 | if (!viewer_connections_ht) { | |
1875 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
1876 | } |
1877 | ||
1878 | ret = create_thread_poll_set(&events, 2); | |
1879 | if (ret < 0) { | |
1880 | goto error_poll_create; | |
1881 | } | |
1882 | ||
58eb9381 | 1883 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
1884 | if (ret < 0) { |
1885 | goto error; | |
1886 | } | |
1887 | ||
1888 | restart: | |
1889 | while (1) { | |
1890 | int i; | |
1891 | ||
eea7556c MD |
1892 | health_code_update(); |
1893 | ||
d3e2ba59 JD |
1894 | /* Infinite blocking call, waiting for transmission */ |
1895 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 1896 | health_poll_entry(); |
d3e2ba59 | 1897 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 1898 | health_poll_exit(); |
d3e2ba59 JD |
1899 | if (ret < 0) { |
1900 | /* | |
1901 | * Restart interrupted system call. | |
1902 | */ | |
1903 | if (errno == EINTR) { | |
1904 | goto restart; | |
1905 | } | |
1906 | goto error; | |
1907 | } | |
1908 | ||
1909 | nb_fd = ret; | |
1910 | ||
1911 | /* | |
1912 | * Process control. The control connection is prioritised so we don't | |
1913 | * starve it with high throughput tracing data on the data | |
1914 | * connection. | |
1915 | */ | |
1916 | for (i = 0; i < nb_fd; i++) { | |
1917 | /* Fetch once the poll data */ | |
1918 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1919 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1920 | ||
eea7556c MD |
1921 | health_code_update(); |
1922 | ||
fd20dac9 MD |
1923 | if (!revents) { |
1924 | /* No activity for this FD (poll implementation). */ | |
1925 | continue; | |
1926 | } | |
1927 | ||
d3e2ba59 | 1928 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 1929 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
1930 | if (ret) { |
1931 | err = 0; | |
1932 | goto exit; | |
1933 | } | |
1934 | ||
5a693d30 | 1935 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 1936 | if (pollfd == live_conn_pipe[0]) { |
92d6debb | 1937 | if (revents & LPOLLIN) { |
302d8906 JG |
1938 | struct relay_connection *conn; |
1939 | ||
5a693d30 MD |
1940 | ret = lttng_read(live_conn_pipe[0], |
1941 | &conn, sizeof(conn)); | |
d3e2ba59 JD |
1942 | if (ret < 0) { |
1943 | goto error; | |
1944 | } | |
58eb9381 DG |
1945 | lttng_poll_add(&events, conn->sock->fd, |
1946 | LPOLLIN | LPOLLRDHUP); | |
5a693d30 MD |
1947 | connection_ht_add(viewer_connections_ht, conn); |
1948 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
92d6debb MD |
1949 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1950 | ERR("Relay live pipe error"); | |
1951 | goto error; | |
1952 | } else { | |
1953 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1954 | goto error; | |
d3e2ba59 | 1955 | } |
58eb9381 | 1956 | } else { |
5a693d30 | 1957 | /* Connection activity. */ |
302d8906 JG |
1958 | struct relay_connection *conn; |
1959 | ||
5a693d30 MD |
1960 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
1961 | if (!conn) { | |
1962 | continue; | |
1963 | } | |
58eb9381 | 1964 | |
92d6debb | 1965 | if (revents & LPOLLIN) { |
58eb9381 DG |
1966 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
1967 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 1968 | if (ret <= 0) { |
5a693d30 | 1969 | /* Connection closed. */ |
58eb9381 | 1970 | cleanup_connection_pollfd(&events, pollfd); |
5a693d30 MD |
1971 | /* Put "create" ownership reference. */ |
1972 | connection_put(conn); | |
58eb9381 | 1973 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 1974 | } else { |
58eb9381 | 1975 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
1976 | if (ret < 0) { |
1977 | /* Clear the session on error. */ | |
58eb9381 | 1978 | cleanup_connection_pollfd(&events, pollfd); |
5a693d30 MD |
1979 | /* Put "create" ownership reference. */ |
1980 | connection_put(conn); | |
d3e2ba59 JD |
1981 | DBG("Viewer connection closed with %d", pollfd); |
1982 | } | |
1983 | } | |
92d6debb MD |
1984 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1985 | cleanup_connection_pollfd(&events, pollfd); | |
1986 | /* Put "create" ownership reference. */ | |
1987 | connection_put(conn); | |
1988 | } else { | |
1989 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); | |
1990 | connection_put(conn); | |
1991 | goto error; | |
d3e2ba59 | 1992 | } |
5a693d30 MD |
1993 | /* Put local "get_by_sock" reference. */ |
1994 | connection_put(conn); | |
d3e2ba59 JD |
1995 | } |
1996 | } | |
1997 | } | |
1998 | ||
1999 | exit: | |
2000 | error: | |
2001 | lttng_poll_clean(&events); | |
2002 | ||
58eb9381 | 2003 | /* Cleanup reamaining connection object. */ |
d3e2ba59 | 2004 | rcu_read_lock(); |
5a693d30 | 2005 | cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter, |
302d8906 | 2006 | destroy_conn, |
58eb9381 | 2007 | sock_n.node) { |
eea7556c | 2008 | health_code_update(); |
5a693d30 | 2009 | connection_put(destroy_conn); |
d3e2ba59 JD |
2010 | } |
2011 | rcu_read_unlock(); | |
2012 | error_poll_create: | |
5a693d30 MD |
2013 | lttng_ht_destroy(viewer_connections_ht); |
2014 | viewer_connections_ht_error: | |
58eb9381 DG |
2015 | /* Close relay conn pipes */ |
2016 | utils_close_pipe(live_conn_pipe); | |
d3e2ba59 JD |
2017 | if (err) { |
2018 | DBG("Viewer worker thread exited with error"); | |
2019 | } | |
2020 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2021 | error_testpoint: |
eea7556c MD |
2022 | if (err) { |
2023 | health_error(); | |
2024 | ERR("Health error occurred in %s", __func__); | |
2025 | } | |
2026 | health_unregister(health_relayd); | |
b4aacfdc MD |
2027 | if (lttng_relay_stop_threads()) { |
2028 | ERR("Error stopping threads"); | |
178a0557 | 2029 | } |
d3e2ba59 JD |
2030 | rcu_unregister_thread(); |
2031 | return NULL; | |
2032 | } | |
2033 | ||
2034 | /* | |
2035 | * Create the relay command pipe to wake thread_manage_apps. | |
2036 | * Closed in cleanup(). | |
2037 | */ | |
58eb9381 | 2038 | static int create_conn_pipe(void) |
d3e2ba59 | 2039 | { |
178a0557 MD |
2040 | return utils_create_pipe_cloexec(live_conn_pipe); |
2041 | } | |
d3e2ba59 | 2042 | |
178a0557 | 2043 | int relayd_live_join(void) |
d3e2ba59 | 2044 | { |
178a0557 | 2045 | int ret, retval = 0; |
d3e2ba59 JD |
2046 | void *status; |
2047 | ||
d3e2ba59 | 2048 | ret = pthread_join(live_listener_thread, &status); |
178a0557 MD |
2049 | if (ret) { |
2050 | errno = ret; | |
d3e2ba59 | 2051 | PERROR("pthread_join live listener"); |
178a0557 | 2052 | retval = -1; |
d3e2ba59 JD |
2053 | } |
2054 | ||
2055 | ret = pthread_join(live_worker_thread, &status); | |
178a0557 MD |
2056 | if (ret) { |
2057 | errno = ret; | |
d3e2ba59 | 2058 | PERROR("pthread_join live worker"); |
178a0557 | 2059 | retval = -1; |
d3e2ba59 JD |
2060 | } |
2061 | ||
2062 | ret = pthread_join(live_dispatcher_thread, &status); | |
178a0557 MD |
2063 | if (ret) { |
2064 | errno = ret; | |
d3e2ba59 | 2065 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2066 | retval = -1; |
d3e2ba59 JD |
2067 | } |
2068 | ||
178a0557 | 2069 | cleanup_relayd_live(); |
d3e2ba59 | 2070 | |
178a0557 | 2071 | return retval; |
d3e2ba59 JD |
2072 | } |
2073 | ||
2074 | /* | |
2075 | * main | |
2076 | */ | |
5a693d30 | 2077 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2078 | { |
178a0557 | 2079 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2080 | void *status; |
2081 | int is_root; | |
2082 | ||
178a0557 MD |
2083 | if (!uri) { |
2084 | retval = -1; | |
2085 | goto exit_init_data; | |
2086 | } | |
d3e2ba59 JD |
2087 | live_uri = uri; |
2088 | ||
d3e2ba59 JD |
2089 | /* Check if daemon is UID = 0 */ |
2090 | is_root = !getuid(); | |
2091 | ||
2092 | if (!is_root) { | |
2093 | if (live_uri->port < 1024) { | |
2094 | ERR("Need to be root to use ports < 1024"); | |
178a0557 MD |
2095 | retval = -1; |
2096 | goto exit_init_data; | |
d3e2ba59 JD |
2097 | } |
2098 | } | |
2099 | ||
2100 | /* Setup the thread apps communication pipe. */ | |
178a0557 MD |
2101 | if (create_conn_pipe()) { |
2102 | retval = -1; | |
2103 | goto exit_init_data; | |
d3e2ba59 JD |
2104 | } |
2105 | ||
2106 | /* Init relay command queue. */ | |
8bdee6e2 | 2107 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2108 | |
2109 | /* Set up max poll set size */ | |
25b397f9 MD |
2110 | if (lttng_poll_set_max_size()) { |
2111 | retval = -1; | |
2112 | goto exit_init_data; | |
2113 | } | |
d3e2ba59 JD |
2114 | |
2115 | /* Setup the dispatcher thread */ | |
2116 | ret = pthread_create(&live_dispatcher_thread, NULL, | |
2117 | thread_dispatcher, (void *) NULL); | |
178a0557 MD |
2118 | if (ret) { |
2119 | errno = ret; | |
d3e2ba59 | 2120 | PERROR("pthread_create viewer dispatcher"); |
178a0557 MD |
2121 | retval = -1; |
2122 | goto exit_dispatcher_thread; | |
d3e2ba59 JD |
2123 | } |
2124 | ||
2125 | /* Setup the worker thread */ | |
2126 | ret = pthread_create(&live_worker_thread, NULL, | |
5a693d30 | 2127 | thread_worker, NULL); |
178a0557 MD |
2128 | if (ret) { |
2129 | errno = ret; | |
d3e2ba59 | 2130 | PERROR("pthread_create viewer worker"); |
178a0557 MD |
2131 | retval = -1; |
2132 | goto exit_worker_thread; | |
d3e2ba59 JD |
2133 | } |
2134 | ||
2135 | /* Setup the listener thread */ | |
2136 | ret = pthread_create(&live_listener_thread, NULL, | |
2137 | thread_listener, (void *) NULL); | |
178a0557 MD |
2138 | if (ret) { |
2139 | errno = ret; | |
d3e2ba59 | 2140 | PERROR("pthread_create viewer listener"); |
178a0557 MD |
2141 | retval = -1; |
2142 | goto exit_listener_thread; | |
d3e2ba59 JD |
2143 | } |
2144 | ||
178a0557 MD |
2145 | /* |
2146 | * All OK, started all threads. | |
2147 | */ | |
2148 | return retval; | |
2149 | ||
9911d21b JG |
2150 | /* |
2151 | * Join on the live_listener_thread should anything be added after | |
2152 | * the live_listener thread's creation. | |
2153 | */ | |
d3e2ba59 | 2154 | |
178a0557 | 2155 | exit_listener_thread: |
d3e2ba59 | 2156 | |
d3e2ba59 | 2157 | ret = pthread_join(live_worker_thread, &status); |
178a0557 MD |
2158 | if (ret) { |
2159 | errno = ret; | |
d3e2ba59 | 2160 | PERROR("pthread_join live worker"); |
178a0557 | 2161 | retval = -1; |
d3e2ba59 | 2162 | } |
178a0557 | 2163 | exit_worker_thread: |
d3e2ba59 | 2164 | |
d3e2ba59 | 2165 | ret = pthread_join(live_dispatcher_thread, &status); |
178a0557 MD |
2166 | if (ret) { |
2167 | errno = ret; | |
d3e2ba59 | 2168 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2169 | retval = -1; |
d3e2ba59 | 2170 | } |
178a0557 | 2171 | exit_dispatcher_thread: |
d3e2ba59 | 2172 | |
178a0557 MD |
2173 | exit_init_data: |
2174 | cleanup_relayd_live(); | |
d3e2ba59 | 2175 | |
178a0557 | 2176 | return retval; |
d3e2ba59 | 2177 | } |