Commit | Line | Data |
---|---|---|
d3e2ba59 JD |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
7591bab1 | 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> | |
7591bab1 | 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" |
7591bab1 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; | |
7591bab1 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 | } | |
7591bab1 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; | |
7591bab1 | 184 | session_put(session); |
f04a971b JD |
185 | if (ret == 1) { |
186 | goto end; | |
187 | } | |
2f8f53af | 188 | } |
f04a971b | 189 | end: |
7591bab1 | 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 | ||
7591bab1 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. */ |
7591bab1 | 223 | if (vstream->stream->trace->session->id != session->id || |
2f8f53af | 224 | (!ignore_sent_flag && vstream->sent_flag)) { |
7591bab1 MD |
225 | pthread_mutex_unlock(&vstream->stream->lock); |
226 | viewer_stream_put(vstream); | |
2f8f53af DG |
227 | continue; |
228 | } | |
229 | ||
7591bab1 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); |
7591bab1 MD |
233 | send_stream.metadata_flag = htobe32( |
234 | vstream->stream->is_metadata); | |
2f8f53af DG |
235 | strncpy(send_stream.path_name, vstream->path_name, |
236 | sizeof(send_stream.path_name)); | |
237 | strncpy(send_stream.channel_name, vstream->channel_name, | |
238 | sizeof(send_stream.channel_name)); | |
239 | ||
7591bab1 MD |
240 | DBG("Sending stream %" PRIu64 " to viewer", |
241 | vstream->stream->stream_handle); | |
242 | vstream->sent_flag = 1; | |
243 | pthread_mutex_unlock(&vstream->stream->lock); | |
244 | ||
2f8f53af | 245 | ret = send_response(sock, &send_stream, sizeof(send_stream)); |
7591bab1 | 246 | viewer_stream_put(vstream); |
2f8f53af DG |
247 | if (ret < 0) { |
248 | goto end_unlock; | |
249 | } | |
2f8f53af DG |
250 | } |
251 | ||
252 | ret = 0; | |
253 | ||
254 | end_unlock: | |
255 | rcu_read_unlock(); | |
256 | return ret; | |
257 | } | |
258 | ||
259 | /* | |
260 | * Create every viewer stream possible for the given session with the seek | |
261 | * type. Three counters *can* be return which are in order the total amount of | |
262 | * viewer stream of the session, the number of unsent stream and the number of | |
263 | * stream created. Those counters can be NULL and thus will be ignored. | |
264 | * | |
265 | * Return 0 on success or else a negative value. | |
266 | */ | |
267 | static | |
268 | int make_viewer_streams(struct relay_session *session, | |
269 | enum lttng_viewer_seek seek_t, uint32_t *nb_total, uint32_t *nb_unsent, | |
bddf80e4 | 270 | uint32_t *nb_created, bool *closed) |
2f8f53af DG |
271 | { |
272 | int ret; | |
2f8f53af | 273 | struct lttng_ht_iter iter; |
2a174661 | 274 | struct ctf_trace *ctf_trace; |
2f8f53af DG |
275 | |
276 | assert(session); | |
277 | ||
278 | /* | |
7591bab1 MD |
279 | * Hold the session lock to ensure that we see either none or |
280 | * all initial streams for a session, but no intermediate state. | |
2f8f53af | 281 | */ |
7591bab1 | 282 | pthread_mutex_lock(&session->lock); |
2f8f53af | 283 | |
bddf80e4 MD |
284 | if (session->connection_closed) { |
285 | *closed = true; | |
286 | } | |
287 | ||
2f8f53af | 288 | /* |
7591bab1 MD |
289 | * Create viewer streams for relay streams that are ready to be |
290 | * used for a the given session id only. | |
2f8f53af | 291 | */ |
2a174661 DG |
292 | rcu_read_lock(); |
293 | cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, | |
294 | node.node) { | |
295 | struct relay_stream *stream; | |
2f8f53af DG |
296 | |
297 | health_code_update(); | |
298 | ||
7591bab1 | 299 | if (!ctf_trace_get(ctf_trace)) { |
2f8f53af DG |
300 | continue; |
301 | } | |
302 | ||
7591bab1 | 303 | cds_list_for_each_entry_rcu(stream, &ctf_trace->stream_list, stream_node) { |
2a174661 DG |
304 | struct relay_viewer_stream *vstream; |
305 | ||
7591bab1 | 306 | if (!stream_get(stream)) { |
2a174661 DG |
307 | continue; |
308 | } | |
7591bab1 MD |
309 | /* |
310 | * stream published is protected by the session | |
311 | * lock. | |
312 | */ | |
313 | if (!stream->published) { | |
314 | goto next; | |
315 | } | |
316 | vstream = viewer_stream_get_by_id(stream->stream_handle); | |
2f8f53af | 317 | if (!vstream) { |
7591bab1 | 318 | vstream = viewer_stream_create(stream, seek_t); |
2a174661 DG |
319 | if (!vstream) { |
320 | ret = -1; | |
7591bab1 MD |
321 | ctf_trace_put(ctf_trace); |
322 | stream_put(stream); | |
2a174661 DG |
323 | goto error_unlock; |
324 | } | |
2a174661 DG |
325 | |
326 | if (nb_created) { | |
327 | /* Update number of created stream counter. */ | |
328 | (*nb_created)++; | |
329 | } | |
7591bab1 MD |
330 | } else { |
331 | if (!vstream->sent_flag && nb_unsent) { | |
332 | /* Update number of unsent stream counter. */ | |
333 | (*nb_unsent)++; | |
334 | } | |
335 | viewer_stream_put(vstream); | |
2f8f53af | 336 | } |
2a174661 DG |
337 | /* Update number of total stream counter. */ |
338 | if (nb_total) { | |
339 | (*nb_total)++; | |
2f8f53af | 340 | } |
7591bab1 MD |
341 | next: |
342 | stream_put(stream); | |
2f8f53af | 343 | } |
7591bab1 | 344 | ctf_trace_put(ctf_trace); |
2f8f53af DG |
345 | } |
346 | ||
347 | ret = 0; | |
348 | ||
349 | error_unlock: | |
2a174661 | 350 | rcu_read_unlock(); |
7591bab1 | 351 | pthread_mutex_unlock(&session->lock); |
2f8f53af DG |
352 | return ret; |
353 | } | |
354 | ||
b4aacfdc | 355 | int relayd_live_stop(void) |
d3e2ba59 | 356 | { |
b4aacfdc | 357 | /* Stop dispatch thread */ |
d3e2ba59 | 358 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); |
58eb9381 | 359 | futex_nto1_wake(&viewer_conn_queue.futex); |
b4aacfdc | 360 | return 0; |
d3e2ba59 JD |
361 | } |
362 | ||
d3e2ba59 JD |
363 | /* |
364 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
365 | */ | |
366 | static | |
367 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
368 | { | |
369 | int ret; | |
370 | ||
371 | if (events == NULL || size == 0) { | |
372 | ret = -1; | |
373 | goto error; | |
374 | } | |
375 | ||
376 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
377 | if (ret < 0) { | |
378 | goto error; | |
379 | } | |
380 | ||
381 | /* Add quit pipe */ | |
bcf4a440 | 382 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
d3e2ba59 JD |
383 | if (ret < 0) { |
384 | goto error; | |
385 | } | |
386 | ||
387 | return 0; | |
388 | ||
389 | error: | |
390 | return ret; | |
391 | } | |
392 | ||
393 | /* | |
394 | * Check if the thread quit pipe was triggered. | |
395 | * | |
396 | * Return 1 if it was triggered else 0; | |
397 | */ | |
398 | static | |
bcf4a440 | 399 | int check_thread_quit_pipe(int fd, uint32_t events) |
d3e2ba59 | 400 | { |
bcf4a440 | 401 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
402 | return 1; |
403 | } | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
408 | /* | |
409 | * Create and init socket from uri. | |
410 | */ | |
411 | static | |
412 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
413 | { | |
414 | int ret; | |
415 | struct lttcomm_sock *sock = NULL; | |
416 | ||
417 | sock = lttcomm_alloc_sock_from_uri(uri); | |
418 | if (sock == NULL) { | |
419 | ERR("Allocating socket"); | |
420 | goto error; | |
421 | } | |
422 | ||
423 | ret = lttcomm_create_sock(sock); | |
424 | if (ret < 0) { | |
425 | goto error; | |
426 | } | |
427 | DBG("Listening on sock %d for live", sock->fd); | |
428 | ||
429 | ret = sock->ops->bind(sock); | |
430 | if (ret < 0) { | |
431 | goto error; | |
432 | } | |
433 | ||
434 | ret = sock->ops->listen(sock, -1); | |
435 | if (ret < 0) { | |
436 | goto error; | |
437 | ||
438 | } | |
439 | ||
440 | return sock; | |
441 | ||
442 | error: | |
443 | if (sock) { | |
444 | lttcomm_destroy_sock(sock); | |
445 | } | |
446 | return NULL; | |
447 | } | |
448 | ||
449 | /* | |
450 | * This thread manages the listening for new connections on the network | |
451 | */ | |
452 | static | |
453 | void *thread_listener(void *data) | |
454 | { | |
455 | int i, ret, pollfd, err = -1; | |
d3e2ba59 JD |
456 | uint32_t revents, nb_fd; |
457 | struct lttng_poll_event events; | |
458 | struct lttcomm_sock *live_control_sock; | |
459 | ||
460 | DBG("[thread] Relay live listener started"); | |
461 | ||
eea7556c MD |
462 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
463 | ||
464 | health_code_update(); | |
465 | ||
d3e2ba59 JD |
466 | live_control_sock = init_socket(live_uri); |
467 | if (!live_control_sock) { | |
468 | goto error_sock_control; | |
469 | } | |
470 | ||
fb4d42ab | 471 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
d3e2ba59 JD |
472 | ret = create_thread_poll_set(&events, 2); |
473 | if (ret < 0) { | |
474 | goto error_create_poll; | |
475 | } | |
476 | ||
477 | /* Add the control socket */ | |
478 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
479 | if (ret < 0) { | |
480 | goto error_poll_add; | |
481 | } | |
482 | ||
3fd27398 MD |
483 | lttng_relay_notify_ready(); |
484 | ||
9b5e0863 MD |
485 | if (testpoint(relayd_thread_live_listener)) { |
486 | goto error_testpoint; | |
487 | } | |
488 | ||
d3e2ba59 | 489 | while (1) { |
eea7556c MD |
490 | health_code_update(); |
491 | ||
d3e2ba59 JD |
492 | DBG("Listener accepting live viewers connections"); |
493 | ||
494 | restart: | |
eea7556c | 495 | health_poll_entry(); |
d3e2ba59 | 496 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 497 | health_poll_exit(); |
d3e2ba59 JD |
498 | if (ret < 0) { |
499 | /* | |
500 | * Restart interrupted system call. | |
501 | */ | |
502 | if (errno == EINTR) { | |
503 | goto restart; | |
504 | } | |
505 | goto error; | |
506 | } | |
507 | nb_fd = ret; | |
508 | ||
509 | DBG("Relay new viewer connection received"); | |
510 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
511 | health_code_update(); |
512 | ||
d3e2ba59 JD |
513 | /* Fetch once the poll data */ |
514 | revents = LTTNG_POLL_GETEV(&events, i); | |
515 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
516 | ||
fd20dac9 MD |
517 | if (!revents) { |
518 | /* No activity for this FD (poll implementation). */ | |
519 | continue; | |
520 | } | |
521 | ||
d3e2ba59 | 522 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 523 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
524 | if (ret) { |
525 | err = 0; | |
526 | goto exit; | |
527 | } | |
528 | ||
529 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
530 | ERR("socket poll error"); | |
531 | goto error; | |
532 | } else if (revents & LPOLLIN) { | |
533 | /* | |
7591bab1 MD |
534 | * A new connection is requested, therefore a |
535 | * viewer connection is allocated in this | |
536 | * thread, enqueued to a global queue and | |
537 | * dequeued (and freed) in the worker thread. | |
d3e2ba59 | 538 | */ |
58eb9381 DG |
539 | int val = 1; |
540 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
541 | struct lttcomm_sock *newsock; |
542 | ||
d3e2ba59 JD |
543 | newsock = live_control_sock->ops->accept(live_control_sock); |
544 | if (!newsock) { | |
545 | PERROR("accepting control sock"); | |
d3e2ba59 JD |
546 | goto error; |
547 | } | |
548 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 549 | |
d3e2ba59 | 550 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
58eb9381 | 551 | sizeof(val)); |
d3e2ba59 JD |
552 | if (ret < 0) { |
553 | PERROR("setsockopt inet"); | |
554 | lttcomm_destroy_sock(newsock); | |
d3e2ba59 JD |
555 | goto error; |
556 | } | |
7591bab1 MD |
557 | new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN); |
558 | if (!new_conn) { | |
559 | lttcomm_destroy_sock(newsock); | |
560 | goto error; | |
561 | } | |
562 | /* Ownership assumed by the connection. */ | |
563 | newsock = NULL; | |
d3e2ba59 | 564 | |
58eb9381 | 565 | /* Enqueue request for the dispatcher thread. */ |
8bdee6e2 SM |
566 | cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail, |
567 | &new_conn->qnode); | |
d3e2ba59 JD |
568 | |
569 | /* | |
7591bab1 MD |
570 | * Wake the dispatch queue futex. |
571 | * Implicit memory barrier with the | |
572 | * exchange in cds_wfcq_enqueue. | |
d3e2ba59 | 573 | */ |
58eb9381 | 574 | futex_nto1_wake(&viewer_conn_queue.futex); |
d3e2ba59 JD |
575 | } |
576 | } | |
577 | } | |
578 | ||
579 | exit: | |
580 | error: | |
581 | error_poll_add: | |
9b5e0863 | 582 | error_testpoint: |
d3e2ba59 JD |
583 | lttng_poll_clean(&events); |
584 | error_create_poll: | |
585 | if (live_control_sock->fd >= 0) { | |
586 | ret = live_control_sock->ops->close(live_control_sock); | |
587 | if (ret) { | |
588 | PERROR("close"); | |
589 | } | |
590 | } | |
591 | lttcomm_destroy_sock(live_control_sock); | |
592 | error_sock_control: | |
593 | if (err) { | |
eea7556c | 594 | health_error(); |
d3e2ba59 JD |
595 | DBG("Live viewer listener thread exited with error"); |
596 | } | |
eea7556c | 597 | health_unregister(health_relayd); |
d3e2ba59 | 598 | DBG("Live viewer listener thread cleanup complete"); |
b4aacfdc MD |
599 | if (lttng_relay_stop_threads()) { |
600 | ERR("Error stopping threads"); | |
178a0557 | 601 | } |
d3e2ba59 JD |
602 | return NULL; |
603 | } | |
604 | ||
605 | /* | |
606 | * This thread manages the dispatching of the requests to worker threads | |
607 | */ | |
608 | static | |
609 | void *thread_dispatcher(void *data) | |
610 | { | |
6cd525e8 MD |
611 | int err = -1; |
612 | ssize_t ret; | |
8bdee6e2 | 613 | struct cds_wfcq_node *node; |
58eb9381 | 614 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
615 | |
616 | DBG("[thread] Live viewer relay dispatcher started"); | |
617 | ||
eea7556c MD |
618 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
619 | ||
9b5e0863 MD |
620 | if (testpoint(relayd_thread_live_dispatcher)) { |
621 | goto error_testpoint; | |
622 | } | |
623 | ||
eea7556c MD |
624 | health_code_update(); |
625 | ||
d3e2ba59 | 626 | while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
eea7556c MD |
627 | health_code_update(); |
628 | ||
d3e2ba59 | 629 | /* Atomically prepare the queue futex */ |
58eb9381 | 630 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 JD |
631 | |
632 | do { | |
eea7556c MD |
633 | health_code_update(); |
634 | ||
d3e2ba59 | 635 | /* Dequeue commands */ |
8bdee6e2 SM |
636 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
637 | &viewer_conn_queue.tail); | |
d3e2ba59 JD |
638 | if (node == NULL) { |
639 | DBG("Woken up but nothing in the live-viewer " | |
640 | "relay command queue"); | |
641 | /* Continue thread execution */ | |
642 | break; | |
643 | } | |
58eb9381 | 644 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 645 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 646 | conn->sock->fd); |
d3e2ba59 JD |
647 | |
648 | /* | |
7591bab1 MD |
649 | * Inform worker thread of the new request. This |
650 | * call is blocking so we can be assured that | |
651 | * the data will be read at some point in time | |
652 | * or wait to the end of the world :) | |
d3e2ba59 | 653 | */ |
58eb9381 DG |
654 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
655 | if (ret < 0) { | |
656 | PERROR("write conn pipe"); | |
7591bab1 | 657 | connection_put(conn); |
d3e2ba59 JD |
658 | goto error; |
659 | } | |
660 | } while (node != NULL); | |
661 | ||
662 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 663 | health_poll_entry(); |
58eb9381 | 664 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 665 | health_poll_exit(); |
d3e2ba59 JD |
666 | } |
667 | ||
eea7556c MD |
668 | /* Normal exit, no error */ |
669 | err = 0; | |
670 | ||
d3e2ba59 | 671 | error: |
9b5e0863 | 672 | error_testpoint: |
eea7556c MD |
673 | if (err) { |
674 | health_error(); | |
675 | ERR("Health error occurred in %s", __func__); | |
676 | } | |
677 | health_unregister(health_relayd); | |
d3e2ba59 | 678 | DBG("Live viewer dispatch thread dying"); |
b4aacfdc MD |
679 | if (lttng_relay_stop_threads()) { |
680 | ERR("Error stopping threads"); | |
178a0557 | 681 | } |
d3e2ba59 JD |
682 | return NULL; |
683 | } | |
684 | ||
685 | /* | |
686 | * Establish connection with the viewer and check the versions. | |
687 | * | |
688 | * Return 0 on success or else negative value. | |
689 | */ | |
690 | static | |
58eb9381 | 691 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
692 | { |
693 | int ret; | |
694 | struct lttng_viewer_connect reply, msg; | |
695 | ||
58eb9381 | 696 | conn->version_check_done = 1; |
d3e2ba59 | 697 | |
eea7556c MD |
698 | health_code_update(); |
699 | ||
2f8f53af DG |
700 | DBG("Viewer is establishing a connection to the relayd."); |
701 | ||
58eb9381 | 702 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 703 | if (ret < 0) { |
d3e2ba59 JD |
704 | goto end; |
705 | } | |
706 | ||
eea7556c MD |
707 | health_code_update(); |
708 | ||
f46b2ce6 | 709 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
710 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
711 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
712 | ||
713 | /* Major versions must be the same */ | |
714 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
715 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
716 | reply.major, be32toh(msg.major)); | |
72180669 | 717 | ret = -1; |
d3e2ba59 JD |
718 | goto end; |
719 | } | |
720 | ||
58eb9381 | 721 | conn->major = reply.major; |
d3e2ba59 JD |
722 | /* We adapt to the lowest compatible version */ |
723 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 724 | conn->minor = reply.minor; |
d3e2ba59 | 725 | } else { |
58eb9381 | 726 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
727 | } |
728 | ||
c4e361a4 | 729 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 730 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 731 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 732 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
733 | } else { |
734 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
735 | ret = -1; | |
736 | goto end; | |
737 | } | |
738 | ||
739 | reply.major = htobe32(reply.major); | |
740 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 741 | if (conn->type == RELAY_VIEWER_COMMAND) { |
93b4787b | 742 | /* |
7591bab1 MD |
743 | * Increment outside of htobe64 macro, because the argument can |
744 | * be used more than once within the macro, and thus the | |
745 | * operation may be undefined. | |
93b4787b | 746 | */ |
7591bab1 | 747 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
93b4787b | 748 | last_relay_viewer_session_id++; |
7591bab1 | 749 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
93b4787b | 750 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 751 | } |
eea7556c MD |
752 | |
753 | health_code_update(); | |
754 | ||
58eb9381 | 755 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 756 | if (ret < 0) { |
2f8f53af | 757 | goto end; |
d3e2ba59 JD |
758 | } |
759 | ||
eea7556c MD |
760 | health_code_update(); |
761 | ||
58eb9381 | 762 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
763 | ret = 0; |
764 | ||
765 | end: | |
766 | return ret; | |
767 | } | |
768 | ||
769 | /* | |
770 | * Send the viewer the list of current sessions. | |
7591bab1 MD |
771 | * We need to create a copy of the hash table content because otherwise |
772 | * we cannot assume the number of entries stays the same between getting | |
773 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
774 | * |
775 | * Return 0 on success or else a negative value. | |
776 | */ | |
777 | static | |
58eb9381 | 778 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 JD |
779 | { |
780 | int ret; | |
781 | struct lttng_viewer_list_sessions session_list; | |
d3e2ba59 | 782 | struct lttng_ht_iter iter; |
d3e2ba59 | 783 | struct relay_session *session; |
7591bab1 MD |
784 | struct lttng_viewer_session *send_session_buf = NULL; |
785 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; | |
786 | uint32_t count = 0; | |
d3e2ba59 JD |
787 | |
788 | DBG("List sessions received"); | |
789 | ||
7591bab1 MD |
790 | send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf)); |
791 | if (!send_session_buf) { | |
792 | return -1; | |
d3e2ba59 JD |
793 | } |
794 | ||
7591bab1 MD |
795 | rcu_read_lock(); |
796 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, | |
2f8f53af | 797 | session_n.node) { |
7591bab1 | 798 | struct lttng_viewer_session *send_session; |
d3e2ba59 | 799 | |
eea7556c MD |
800 | health_code_update(); |
801 | ||
7591bab1 MD |
802 | if (count >= buf_count) { |
803 | struct lttng_viewer_session *newbuf; | |
804 | uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 805 | |
7591bab1 MD |
806 | newbuf = realloc(send_session_buf, |
807 | new_buf_count * sizeof(*send_session_buf)); | |
808 | if (!newbuf) { | |
809 | ret = -1; | |
810 | rcu_read_unlock(); | |
811 | goto end_free; | |
812 | } | |
813 | send_session_buf = newbuf; | |
814 | buf_count = new_buf_count; | |
6763619c | 815 | } |
7591bab1 MD |
816 | send_session = &send_session_buf[count]; |
817 | strncpy(send_session->session_name, session->session_name, | |
818 | sizeof(send_session->session_name)); | |
819 | strncpy(send_session->hostname, session->hostname, | |
820 | sizeof(send_session->hostname)); | |
821 | send_session->id = htobe64(session->id); | |
822 | send_session->live_timer = htobe32(session->live_timer); | |
823 | if (session->viewer_attached) { | |
824 | send_session->clients = htobe32(1); | |
825 | } else { | |
826 | send_session->clients = htobe32(0); | |
d227d5bd | 827 | } |
7591bab1 MD |
828 | send_session->streams = htobe32(session->stream_count); |
829 | count++; | |
830 | } | |
831 | rcu_read_unlock(); | |
d227d5bd | 832 | |
7591bab1 | 833 | session_list.sessions_count = htobe32(count); |
d227d5bd | 834 | |
7591bab1 | 835 | health_code_update(); |
d227d5bd | 836 | |
7591bab1 MD |
837 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
838 | if (ret < 0) { | |
839 | goto end_free; | |
d227d5bd | 840 | } |
d227d5bd | 841 | |
7591bab1 | 842 | health_code_update(); |
d227d5bd | 843 | |
7591bab1 MD |
844 | ret = send_response(conn->sock, send_session_buf, |
845 | count * sizeof(*send_session_buf)); | |
846 | if (ret < 0) { | |
847 | goto end_free; | |
d227d5bd | 848 | } |
7591bab1 | 849 | health_code_update(); |
d227d5bd | 850 | |
7591bab1 MD |
851 | ret = 0; |
852 | end_free: | |
853 | free(send_session_buf); | |
854 | return ret; | |
d227d5bd JD |
855 | } |
856 | ||
80e8027a | 857 | /* |
7591bab1 | 858 | * Send the viewer the list of current streams. |
80e8027a JD |
859 | */ |
860 | static | |
58eb9381 | 861 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
862 | { |
863 | int ret, send_streams = 0; | |
7591bab1 | 864 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
865 | struct lttng_viewer_new_streams_request request; |
866 | struct lttng_viewer_new_streams_response response; | |
80e8027a | 867 | struct relay_session *session; |
6763619c | 868 | uint64_t session_id; |
bddf80e4 | 869 | bool closed = false; |
80e8027a | 870 | |
58eb9381 | 871 | assert(conn); |
80e8027a JD |
872 | |
873 | DBG("Get new streams received"); | |
874 | ||
80e8027a JD |
875 | health_code_update(); |
876 | ||
2f8f53af | 877 | /* Receive the request from the connected client. */ |
58eb9381 | 878 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 879 | if (ret < 0) { |
80e8027a JD |
880 | goto error; |
881 | } | |
6763619c | 882 | session_id = be64toh(request.session_id); |
80e8027a JD |
883 | |
884 | health_code_update(); | |
885 | ||
53efb85a MD |
886 | memset(&response, 0, sizeof(response)); |
887 | ||
7591bab1 | 888 | session = session_get_by_id(session_id); |
2f8f53af | 889 | if (!session) { |
6763619c | 890 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 891 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
892 | goto send_reply; |
893 | } | |
894 | ||
7591bab1 | 895 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
80e8027a | 896 | send_streams = 0; |
c4e361a4 | 897 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
898 | goto send_reply; |
899 | } | |
900 | ||
6763619c JD |
901 | send_streams = 1; |
902 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
903 | ||
7591bab1 | 904 | ret = make_viewer_streams(session, LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent, |
bddf80e4 | 905 | &nb_created, &closed); |
2f8f53af | 906 | if (ret < 0) { |
7591bab1 | 907 | goto end_put_session; |
2f8f53af DG |
908 | } |
909 | /* Only send back the newly created streams with the unsent ones. */ | |
910 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
911 | response.streams_count = htobe32(nb_streams); |
912 | ||
4479f682 | 913 | /* |
bddf80e4 | 914 | * If the session is closed, HUP when there are no more streams. |
4479f682 | 915 | */ |
bddf80e4 | 916 | if (closed && nb_total == 0) { |
4479f682 | 917 | send_streams = 0; |
bddf80e4 | 918 | response.streams_count = 0; |
4479f682 JD |
919 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
920 | goto send_reply; | |
921 | } | |
922 | ||
80e8027a JD |
923 | send_reply: |
924 | health_code_update(); | |
58eb9381 | 925 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 926 | if (ret < 0) { |
7591bab1 | 927 | goto end_put_session; |
80e8027a JD |
928 | } |
929 | health_code_update(); | |
930 | ||
931 | /* | |
7591bab1 MD |
932 | * Unknown or empty session, just return gracefully, the viewer |
933 | * knows what is happening. | |
80e8027a JD |
934 | */ |
935 | if (!send_streams || !nb_streams) { | |
936 | ret = 0; | |
7591bab1 | 937 | goto end_put_session; |
80e8027a JD |
938 | } |
939 | ||
2f8f53af | 940 | /* |
7591bab1 MD |
941 | * Send stream and *DON'T* ignore the sent flag so every viewer |
942 | * streams that were not sent from that point will be sent to | |
943 | * the viewer. | |
2f8f53af | 944 | */ |
58eb9381 | 945 | ret = send_viewer_streams(conn->sock, session, 0); |
2f8f53af | 946 | if (ret < 0) { |
7591bab1 | 947 | goto end_put_session; |
80e8027a JD |
948 | } |
949 | ||
7591bab1 MD |
950 | end_put_session: |
951 | if (session) { | |
952 | session_put(session); | |
953 | } | |
80e8027a JD |
954 | error: |
955 | return ret; | |
956 | } | |
957 | ||
d3e2ba59 JD |
958 | /* |
959 | * Send the viewer the list of current sessions. | |
960 | */ | |
961 | static | |
58eb9381 | 962 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 963 | { |
2f8f53af DG |
964 | int send_streams = 0; |
965 | ssize_t ret; | |
80e8027a | 966 | uint32_t nb_streams = 0; |
2f8f53af | 967 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
968 | struct lttng_viewer_attach_session_request request; |
969 | struct lttng_viewer_attach_session_response response; | |
7591bab1 | 970 | struct relay_session *session = NULL; |
bddf80e4 | 971 | bool closed = false; |
d3e2ba59 | 972 | |
58eb9381 | 973 | assert(conn); |
d3e2ba59 | 974 | |
eea7556c MD |
975 | health_code_update(); |
976 | ||
2f8f53af | 977 | /* Receive the request from the connected client. */ |
58eb9381 | 978 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 979 | if (ret < 0) { |
d3e2ba59 JD |
980 | goto error; |
981 | } | |
982 | ||
eea7556c MD |
983 | health_code_update(); |
984 | ||
53efb85a MD |
985 | memset(&response, 0, sizeof(response)); |
986 | ||
c3b7390b JD |
987 | if (!conn->viewer_session) { |
988 | DBG("Client trying to attach before creating a live viewer session"); | |
989 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
990 | goto send_reply; | |
991 | } | |
992 | ||
7591bab1 | 993 | session = session_get_by_id(be64toh(request.session_id)); |
2f8f53af | 994 | if (!session) { |
d3e2ba59 JD |
995 | DBG("Relay session %" PRIu64 " not found", |
996 | be64toh(request.session_id)); | |
c4e361a4 | 997 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
998 | goto send_reply; |
999 | } | |
7591bab1 MD |
1000 | DBG("Attach session ID %" PRIu64 " received", |
1001 | be64toh(request.session_id)); | |
d3e2ba59 | 1002 | |
7591bab1 | 1003 | if (session->live_timer == 0) { |
d3e2ba59 | 1004 | DBG("Not live session"); |
c4e361a4 | 1005 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 | 1006 | goto send_reply; |
7591bab1 MD |
1007 | } |
1008 | ||
1009 | send_streams = 1; | |
1010 | ret = viewer_session_attach(conn->viewer_session, session); | |
1011 | if (ret) { | |
1012 | DBG("Already a viewer attached"); | |
1013 | response.status = htobe32(LTTNG_VIEWER_ATTACH_ALREADY); | |
1014 | goto send_reply; | |
d3e2ba59 JD |
1015 | } |
1016 | ||
1017 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1018 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1019 | case LTTNG_VIEWER_SEEK_LAST: | |
7591bab1 | 1020 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
2f8f53af | 1021 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
1022 | break; |
1023 | default: | |
1024 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1025 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1026 | send_streams = 0; |
1027 | goto send_reply; | |
1028 | } | |
1029 | ||
bddf80e4 MD |
1030 | ret = make_viewer_streams(session, seek_type, &nb_streams, NULL, |
1031 | NULL, &closed); | |
2f8f53af | 1032 | if (ret < 0) { |
7591bab1 | 1033 | goto end_put_session; |
d3e2ba59 | 1034 | } |
2f8f53af | 1035 | response.streams_count = htobe32(nb_streams); |
d3e2ba59 | 1036 | |
bddf80e4 MD |
1037 | /* |
1038 | * If the session is closed when the viewer is attaching, it | |
1039 | * means some of the streams may have been concurrently removed, | |
1040 | * so we don't allow the viewer to attach, even if there are | |
1041 | * streams available. | |
1042 | */ | |
1043 | if (closed) { | |
1044 | send_streams = 0; | |
1045 | response.streams_count = 0; | |
1046 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); | |
1047 | goto send_reply; | |
1048 | } | |
1049 | ||
d3e2ba59 | 1050 | send_reply: |
eea7556c | 1051 | health_code_update(); |
58eb9381 | 1052 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1053 | if (ret < 0) { |
7591bab1 | 1054 | goto end_put_session; |
d3e2ba59 | 1055 | } |
eea7556c | 1056 | health_code_update(); |
d3e2ba59 JD |
1057 | |
1058 | /* | |
7591bab1 MD |
1059 | * Unknown or empty session, just return gracefully, the viewer |
1060 | * knows what is happening. | |
d3e2ba59 | 1061 | */ |
157df586 | 1062 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1063 | ret = 0; |
7591bab1 | 1064 | goto end_put_session; |
d3e2ba59 JD |
1065 | } |
1066 | ||
2f8f53af | 1067 | /* Send stream and ignore the sent flag. */ |
58eb9381 | 1068 | ret = send_viewer_streams(conn->sock, session, 1); |
2f8f53af | 1069 | if (ret < 0) { |
7591bab1 | 1070 | goto end_put_session; |
d3e2ba59 | 1071 | } |
d3e2ba59 | 1072 | |
7591bab1 MD |
1073 | end_put_session: |
1074 | if (session) { | |
1075 | session_put(session); | |
1076 | } | |
4a9daf17 JD |
1077 | error: |
1078 | return ret; | |
1079 | } | |
1080 | ||
878c34cf DG |
1081 | /* |
1082 | * Open the index file if needed for the given vstream. | |
1083 | * | |
7591bab1 MD |
1084 | * If an index file is successfully opened, the vstream index_fd set with |
1085 | * it. | |
878c34cf DG |
1086 | * |
1087 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
7591bab1 MD |
1088 | * |
1089 | * Called with rstream lock held. | |
878c34cf DG |
1090 | */ |
1091 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1092 | struct relay_stream *rstream) | |
1093 | { | |
1094 | int ret = 0; | |
1095 | ||
7591bab1 | 1096 | if (vstream->index_fd) { |
878c34cf DG |
1097 | goto end; |
1098 | } | |
1099 | ||
1100 | /* | |
7591bab1 | 1101 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1102 | */ |
7591bab1 | 1103 | if (rstream->total_index_received == 0) { |
878c34cf DG |
1104 | ret = -ENOENT; |
1105 | goto end; | |
1106 | } | |
1107 | ret = index_open(vstream->path_name, vstream->channel_name, | |
7591bab1 MD |
1108 | vstream->stream->tracefile_count, |
1109 | vstream->current_tracefile_id); | |
878c34cf | 1110 | if (ret >= 0) { |
7591bab1 MD |
1111 | vstream->index_fd = stream_fd_create(ret); |
1112 | if (!vstream->index_fd) { | |
1113 | if (close(ret)) { | |
1114 | PERROR("close"); | |
1115 | } | |
1116 | ret = -1; | |
1117 | } else { | |
1118 | ret = 0; | |
1119 | } | |
878c34cf DG |
1120 | goto end; |
1121 | } | |
1122 | ||
1123 | end: | |
1124 | return ret; | |
1125 | } | |
1126 | ||
1127 | /* | |
7591bab1 MD |
1128 | * Check the status of the index for the given stream. This function |
1129 | * updates the index structure if needed and can put (close) the vstream | |
1130 | * in the HUP situation. | |
1131 | * | |
1132 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1133 | * that the index has been updated and is ready to be sent to the | |
1134 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1135 | * |
7591bab1 | 1136 | * Called with rstream lock held. |
878c34cf DG |
1137 | */ |
1138 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1139 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1140 | struct lttng_viewer_index *index) | |
1141 | { | |
1142 | int ret; | |
1143 | ||
7591bab1 MD |
1144 | if (trace->session->connection_closed |
1145 | && rstream->total_index_received | |
1146 | == vstream->last_sent_index) { | |
1147 | /* Last index sent and session connection is closed. */ | |
1148 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1149 | goto hup; | |
1150 | } else if (rstream->beacon_ts_end != -1ULL && | |
1151 | rstream->total_index_received | |
1152 | == vstream->last_sent_index) { | |
1153 | /* | |
1154 | * We've received a synchronization beacon and the last index | |
1155 | * available has been sent, the index for now is inactive. | |
1156 | * | |
1157 | * In this case, we have received a beacon which allows us to | |
1158 | * inform the client of a time interval during which we can | |
1159 | * guarantee that there are no events to read (and never will | |
1160 | * be). | |
1161 | */ | |
1162 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1163 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1164 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
1165 | goto index_ready; | |
1166 | } else if (rstream->total_index_received <= vstream->last_sent_index) { | |
1167 | /* | |
1168 | * This actually checks the case where recv == last_sent. | |
1169 | * In this case, we have not received a beacon. Therefore, we | |
1170 | * can only ask the client to retry later. | |
1171 | */ | |
1172 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1173 | goto index_ready; | |
1174 | } else if (!viewer_stream_is_tracefile_seq_readable(vstream, | |
1175 | vstream->current_tracefile_seq)) { | |
1176 | /* | |
1177 | * The producer has overwritten our current file. We | |
1178 | * need to rotate. | |
1179 | */ | |
1180 | DBG("Viewer stream %" PRIu64 " rotation due to overwrite", | |
1181 | vstream->stream->stream_handle); | |
1182 | ret = viewer_stream_rotate(vstream); | |
1183 | if (ret < 0) { | |
1184 | goto end; | |
1185 | } else if (ret == 1) { | |
1186 | /* EOF across entire stream. */ | |
1187 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1188 | goto hup; | |
1189 | } | |
1190 | assert(viewer_stream_is_tracefile_seq_readable(vstream, | |
1191 | vstream->current_tracefile_seq)); | |
1192 | /* ret == 0 means successful so we continue. */ | |
1193 | ret = 0; | |
1194 | } else { | |
1195 | ssize_t read_ret; | |
1196 | char tmp[1]; | |
1197 | ||
1198 | /* | |
1199 | * Use EOF on current index file to find out when we | |
1200 | * need to rotate. | |
1201 | */ | |
1202 | read_ret = lttng_read(vstream->index_fd->fd, tmp, 1); | |
1203 | if (read_ret == 1) { | |
1204 | off_t seek_ret; | |
1205 | ||
1206 | /* There is still data to read. Rewind position. */ | |
1207 | seek_ret = lseek(vstream->index_fd->fd, -1, SEEK_CUR); | |
1208 | if (seek_ret < 0) { | |
1209 | ret = -1; | |
1210 | goto end; | |
1211 | } | |
1212 | ret = 0; | |
1213 | } else if (read_ret == 0) { | |
1214 | /* EOF. We need to rotate. */ | |
1215 | DBG("Viewer stream %" PRIu64 " rotation due to EOF", | |
1216 | vstream->stream->stream_handle); | |
1217 | ret = viewer_stream_rotate(vstream); | |
878c34cf | 1218 | if (ret < 0) { |
7591bab1 | 1219 | goto end; |
878c34cf | 1220 | } else if (ret == 1) { |
7591bab1 | 1221 | /* EOF across entire stream. */ |
878c34cf DG |
1222 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
1223 | goto hup; | |
1224 | } | |
7591bab1 MD |
1225 | assert(viewer_stream_is_tracefile_seq_readable(vstream, |
1226 | vstream->current_tracefile_seq)); | |
878c34cf | 1227 | /* ret == 0 means successful so we continue. */ |
7591bab1 MD |
1228 | ret = 0; |
1229 | } else { | |
1230 | /* Error reading index. */ | |
1231 | ret = -1; | |
878c34cf | 1232 | } |
878c34cf | 1233 | } |
7591bab1 | 1234 | end: |
878c34cf DG |
1235 | return ret; |
1236 | ||
1237 | hup: | |
7591bab1 | 1238 | viewer_stream_put(vstream); |
878c34cf DG |
1239 | index_ready: |
1240 | return 1; | |
1241 | } | |
1242 | ||
d3e2ba59 JD |
1243 | /* |
1244 | * Send the next index for a stream. | |
1245 | * | |
1246 | * Return 0 on success or else a negative value. | |
1247 | */ | |
1248 | static | |
58eb9381 | 1249 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1250 | { |
1251 | int ret; | |
878c34cf | 1252 | ssize_t read_ret; |
d3e2ba59 JD |
1253 | struct lttng_viewer_get_next_index request_index; |
1254 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1255 | struct ctf_packet_index packet_index; |
7591bab1 MD |
1256 | struct relay_viewer_stream *vstream = NULL; |
1257 | struct relay_stream *rstream = NULL; | |
1258 | struct ctf_trace *ctf_trace = NULL; | |
1259 | struct relay_viewer_stream *metadata_viewer_stream = NULL; | |
d3e2ba59 | 1260 | |
58eb9381 | 1261 | assert(conn); |
d3e2ba59 JD |
1262 | |
1263 | DBG("Viewer get next index"); | |
1264 | ||
7591bab1 | 1265 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1266 | health_code_update(); |
2f8f53af | 1267 | |
58eb9381 | 1268 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1269 | if (ret < 0) { |
d3e2ba59 JD |
1270 | goto end; |
1271 | } | |
eea7556c | 1272 | health_code_update(); |
d3e2ba59 | 1273 | |
7591bab1 | 1274 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1275 | if (!vstream) { |
2a174661 | 1276 | ret = -1; |
7591bab1 | 1277 | goto end; |
2a174661 DG |
1278 | } |
1279 | ||
7591bab1 MD |
1280 | /* Use back. ref. Protected by refcounts. */ |
1281 | rstream = vstream->stream; | |
1282 | ctf_trace = rstream->trace; | |
d3e2ba59 | 1283 | |
7591bab1 MD |
1284 | /* metadata_viewer_stream may be NULL. */ |
1285 | metadata_viewer_stream = | |
1286 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
2a174661 | 1287 | |
7591bab1 | 1288 | pthread_mutex_lock(&rstream->lock); |
d3e2ba59 JD |
1289 | |
1290 | /* | |
1291 | * The viewer should not ask for index on metadata stream. | |
1292 | */ | |
7591bab1 | 1293 | if (rstream->is_metadata) { |
c4e361a4 | 1294 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
d3e2ba59 JD |
1295 | goto send_reply; |
1296 | } | |
1297 | ||
878c34cf DG |
1298 | /* Try to open an index if one is needed for that stream. */ |
1299 | ret = try_open_index(vstream, rstream); | |
1300 | if (ret < 0) { | |
0e6830aa | 1301 | if (ret == -ENOENT) { |
d3e2ba59 | 1302 | /* |
7591bab1 MD |
1303 | * The index is created only when the first data |
1304 | * packet arrives, it might not be ready at the | |
1305 | * beginning of the session | |
d3e2ba59 | 1306 | */ |
c4e361a4 | 1307 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); |
878c34cf DG |
1308 | } else { |
1309 | /* Unhandled error. */ | |
c4e361a4 | 1310 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
d3e2ba59 | 1311 | } |
878c34cf | 1312 | goto send_reply; |
d3e2ba59 JD |
1313 | } |
1314 | ||
878c34cf | 1315 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
878c34cf | 1316 | if (ret < 0) { |
7591bab1 | 1317 | goto error_put; |
878c34cf DG |
1318 | } else if (ret == 1) { |
1319 | /* | |
7591bab1 MD |
1320 | * We have no index to send and check_index_status has populated |
1321 | * viewer_index's status. | |
878c34cf | 1322 | */ |
d3e2ba59 JD |
1323 | goto send_reply; |
1324 | } | |
7591bab1 | 1325 | /* At this point, ret is 0 thus we will be able to read the index. */ |
878c34cf | 1326 | assert(!ret); |
d3e2ba59 | 1327 | |
7591bab1 MD |
1328 | /* |
1329 | * vstream->stream_fd may be NULL if it has been closed by | |
1330 | * tracefile rotation, or if we are at the beginning of the | |
1331 | * stream. We open the data stream file here to protect against | |
1332 | * overwrite caused by tracefile rotation (in association with | |
1333 | * unlink performed before overwrite). | |
1334 | */ | |
1335 | if (!vstream->stream_fd) { | |
1336 | char fullpath[PATH_MAX]; | |
1337 | ||
1338 | if (vstream->stream->tracefile_count > 0) { | |
1339 | ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64, | |
1340 | vstream->path_name, | |
1341 | vstream->channel_name, | |
1342 | vstream->current_tracefile_id); | |
1343 | } else { | |
1344 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", | |
1345 | vstream->path_name, | |
1346 | vstream->channel_name); | |
1347 | } | |
1348 | if (ret < 0) { | |
1349 | goto error_put; | |
1350 | } | |
1351 | ret = open(fullpath, O_RDONLY); | |
1352 | if (ret < 0) { | |
1353 | PERROR("Relay opening trace file"); | |
1354 | goto error_put; | |
1355 | } | |
1356 | vstream->stream_fd = stream_fd_create(ret); | |
1357 | if (!vstream->stream_fd) { | |
1358 | if (close(ret)) { | |
1359 | PERROR("close"); | |
1360 | } | |
1361 | goto error_put; | |
1362 | } | |
d3e2ba59 JD |
1363 | } |
1364 | ||
f04a971b | 1365 | ret = check_new_streams(conn); |
4a9daf17 | 1366 | if (ret < 0) { |
7591bab1 MD |
1367 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1368 | goto send_reply; | |
4a9daf17 JD |
1369 | } else if (ret == 1) { |
1370 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1371 | } | |
1372 | ||
7591bab1 | 1373 | read_ret = lttng_read(vstream->index_fd->fd, &packet_index, |
6cd525e8 | 1374 | sizeof(packet_index)); |
7591bab1 MD |
1375 | if (read_ret < sizeof(packet_index)) { |
1376 | ERR("Relay reading index file %d returned %zd", | |
1377 | vstream->index_fd->fd, read_ret); | |
1378 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); | |
6b6b9a5a | 1379 | goto send_reply; |
d3e2ba59 | 1380 | } else { |
c4e361a4 | 1381 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
d3e2ba59 JD |
1382 | vstream->last_sent_index++; |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * Indexes are stored in big endian, no need to switch before sending. | |
1387 | */ | |
7591bab1 MD |
1388 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
1389 | rstream->stream_handle, | |
1390 | be64toh(packet_index.offset)); | |
d3e2ba59 JD |
1391 | viewer_index.offset = packet_index.offset; |
1392 | viewer_index.packet_size = packet_index.packet_size; | |
1393 | viewer_index.content_size = packet_index.content_size; | |
1394 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1395 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1396 | viewer_index.events_discarded = packet_index.events_discarded; | |
1397 | viewer_index.stream_id = packet_index.stream_id; | |
1398 | ||
1399 | send_reply: | |
7591bab1 MD |
1400 | pthread_mutex_unlock(&rstream->lock); |
1401 | ||
1402 | if (metadata_viewer_stream) { | |
1403 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
1404 | DBG("get next index metadata check: recv %" PRIu64 | |
1405 | " sent %" PRIu64, | |
1406 | metadata_viewer_stream->stream->metadata_received, | |
1407 | metadata_viewer_stream->metadata_sent); | |
1408 | if (!metadata_viewer_stream->stream->metadata_received || | |
1409 | metadata_viewer_stream->stream->metadata_received > | |
1410 | metadata_viewer_stream->metadata_sent) { | |
1411 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1412 | } | |
1413 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
1414 | } | |
1415 | ||
d3e2ba59 | 1416 | viewer_index.flags = htobe32(viewer_index.flags); |
eea7556c | 1417 | health_code_update(); |
2f8f53af | 1418 | |
58eb9381 | 1419 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1420 | if (ret < 0) { |
7591bab1 | 1421 | goto end; |
d3e2ba59 | 1422 | } |
eea7556c | 1423 | health_code_update(); |
d3e2ba59 | 1424 | |
2f8f53af | 1425 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", |
7591bab1 MD |
1426 | vstream->last_sent_index, |
1427 | vstream->stream->stream_handle); | |
d3e2ba59 | 1428 | end: |
7591bab1 MD |
1429 | if (metadata_viewer_stream) { |
1430 | viewer_stream_put(metadata_viewer_stream); | |
1431 | } | |
1432 | if (vstream) { | |
1433 | viewer_stream_put(vstream); | |
1434 | } | |
1435 | return ret; | |
1436 | ||
1437 | error_put: | |
1438 | pthread_mutex_unlock(&rstream->lock); | |
1439 | if (metadata_viewer_stream) { | |
1440 | viewer_stream_put(metadata_viewer_stream); | |
1441 | } | |
1442 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
1443 | return ret; |
1444 | } | |
1445 | ||
1446 | /* | |
1447 | * Send the next index for a stream | |
1448 | * | |
1449 | * Return 0 on success or else a negative value. | |
1450 | */ | |
1451 | static | |
58eb9381 | 1452 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 JD |
1453 | { |
1454 | int ret, send_data = 0; | |
1455 | char *data = NULL; | |
1456 | uint32_t len = 0; | |
1457 | ssize_t read_len; | |
1458 | struct lttng_viewer_get_packet get_packet_info; | |
1459 | struct lttng_viewer_trace_packet reply; | |
7591bab1 | 1460 | struct relay_viewer_stream *vstream = NULL; |
2a174661 | 1461 | struct ctf_trace *ctf_trace; |
7591bab1 | 1462 | struct relay_viewer_stream *metadata_viewer_stream = NULL; |
d3e2ba59 JD |
1463 | |
1464 | DBG2("Relay get data packet"); | |
1465 | ||
eea7556c | 1466 | health_code_update(); |
2f8f53af | 1467 | |
7591bab1 MD |
1468 | ret = recv_request(conn->sock, &get_packet_info, |
1469 | sizeof(get_packet_info)); | |
2f8f53af | 1470 | if (ret < 0) { |
d3e2ba59 JD |
1471 | goto end; |
1472 | } | |
eea7556c | 1473 | health_code_update(); |
d3e2ba59 | 1474 | |
0233a6a5 DG |
1475 | /* From this point on, the error label can be reached. */ |
1476 | memset(&reply, 0, sizeof(reply)); | |
1477 | ||
7591bab1 MD |
1478 | vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id)); |
1479 | if (!vstream) { | |
d3e2ba59 JD |
1480 | goto error; |
1481 | } | |
2a174661 | 1482 | |
7591bab1 | 1483 | ctf_trace = vstream->stream->trace; |
6763619c | 1484 | |
7591bab1 MD |
1485 | /* metadata_viewer_stream may be NULL. */ |
1486 | metadata_viewer_stream = | |
1487 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
d3e2ba59 | 1488 | |
7591bab1 MD |
1489 | if (metadata_viewer_stream) { |
1490 | bool get_packet_err = false; | |
d3e2ba59 | 1491 | |
7591bab1 MD |
1492 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); |
1493 | DBG("get packet metadata check: recv %" PRIu64 " sent %" PRIu64, | |
1494 | metadata_viewer_stream->stream->metadata_received, | |
1495 | metadata_viewer_stream->metadata_sent); | |
1496 | if (!metadata_viewer_stream->stream->metadata_received || | |
1497 | metadata_viewer_stream->stream->metadata_received > | |
1498 | metadata_viewer_stream->metadata_sent) { | |
1499 | /* | |
1500 | * We prevent the client from reading a data stream as | |
1501 | * long as there is metadata left to consume. This | |
1502 | * ensures that the client won't receive data of which | |
1503 | * it can't make sense. | |
1504 | */ | |
1505 | get_packet_err = true; | |
d3e2ba59 | 1506 | } |
7591bab1 MD |
1507 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); |
1508 | viewer_stream_put(metadata_viewer_stream); | |
1509 | if (get_packet_err) { | |
1510 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); | |
1511 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1512 | goto send_reply_nolock; | |
d3e2ba59 | 1513 | } |
d3e2ba59 JD |
1514 | } |
1515 | ||
7591bab1 MD |
1516 | pthread_mutex_lock(&vstream->stream->lock); |
1517 | /* | |
1518 | * The vstream->stream_fd used here has been opened by | |
1519 | * get_next_index. It is opened there because this is what | |
1520 | * allows us to grab a reference to the file with stream lock | |
1521 | * held, thus protecting us against overwrite caused by | |
1522 | * tracefile rotation. Since tracefile rotation unlinks the old | |
1523 | * data file, we are ensured that we won't have our data | |
1524 | * overwritten under us. | |
1525 | */ | |
f04a971b | 1526 | ret = check_new_streams(conn); |
4a9daf17 | 1527 | if (ret < 0) { |
7591bab1 | 1528 | goto end_free; |
4a9daf17 | 1529 | } else if (ret == 1) { |
c4e361a4 | 1530 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
4a9daf17 JD |
1531 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; |
1532 | goto send_reply; | |
1533 | } | |
1534 | ||
d3e2ba59 JD |
1535 | len = be32toh(get_packet_info.len); |
1536 | data = zmalloc(len); | |
1537 | if (!data) { | |
1538 | PERROR("relay data zmalloc"); | |
1539 | goto error; | |
1540 | } | |
1541 | ||
7591bab1 MD |
1542 | ret = lseek(vstream->stream_fd->fd, be64toh(get_packet_info.offset), |
1543 | SEEK_SET); | |
d3e2ba59 | 1544 | if (ret < 0) { |
7591bab1 MD |
1545 | PERROR("lseek fd %d to offset %" PRIu64, vstream->stream_fd->fd, |
1546 | be64toh(get_packet_info.offset)); | |
1547 | goto error; | |
d3e2ba59 | 1548 | } |
7591bab1 | 1549 | read_len = lttng_read(vstream->stream_fd->fd, data, len); |
6cd525e8 | 1550 | if (read_len < len) { |
7591bab1 MD |
1551 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, |
1552 | vstream->stream_fd->fd, | |
1553 | be64toh(get_packet_info.offset)); | |
1554 | goto error; | |
d3e2ba59 | 1555 | } |
c4e361a4 | 1556 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
d3e2ba59 JD |
1557 | reply.len = htobe32(len); |
1558 | send_data = 1; | |
1559 | goto send_reply; | |
1560 | ||
1561 | error: | |
c4e361a4 | 1562 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1563 | |
1564 | send_reply: | |
7591bab1 MD |
1565 | if (vstream) { |
1566 | pthread_mutex_unlock(&vstream->stream->lock); | |
1567 | } | |
1568 | send_reply_nolock: | |
d3e2ba59 | 1569 | reply.flags = htobe32(reply.flags); |
eea7556c MD |
1570 | |
1571 | health_code_update(); | |
2f8f53af | 1572 | |
58eb9381 | 1573 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1574 | if (ret < 0) { |
7591bab1 | 1575 | goto end_free; |
d3e2ba59 | 1576 | } |
eea7556c | 1577 | health_code_update(); |
d3e2ba59 JD |
1578 | |
1579 | if (send_data) { | |
eea7556c | 1580 | health_code_update(); |
58eb9381 | 1581 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1582 | if (ret < 0) { |
7591bab1 | 1583 | goto end_free; |
d3e2ba59 | 1584 | } |
eea7556c | 1585 | health_code_update(); |
d3e2ba59 JD |
1586 | } |
1587 | ||
1588 | DBG("Sent %u bytes for stream %" PRIu64, len, | |
1589 | be64toh(get_packet_info.stream_id)); | |
1590 | ||
7591bab1 | 1591 | end_free: |
d3e2ba59 | 1592 | free(data); |
d3e2ba59 | 1593 | end: |
7591bab1 MD |
1594 | if (vstream) { |
1595 | viewer_stream_put(vstream); | |
1596 | } | |
d3e2ba59 JD |
1597 | return ret; |
1598 | } | |
1599 | ||
1600 | /* | |
1601 | * Send the session's metadata | |
1602 | * | |
1603 | * Return 0 on success else a negative value. | |
1604 | */ | |
1605 | static | |
58eb9381 | 1606 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1607 | { |
1608 | int ret = 0; | |
1609 | ssize_t read_len; | |
1610 | uint64_t len = 0; | |
1611 | char *data = NULL; | |
1612 | struct lttng_viewer_get_metadata request; | |
1613 | struct lttng_viewer_metadata_packet reply; | |
7591bab1 | 1614 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 | 1615 | |
58eb9381 | 1616 | assert(conn); |
d3e2ba59 JD |
1617 | |
1618 | DBG("Relay get metadata"); | |
1619 | ||
eea7556c | 1620 | health_code_update(); |
2f8f53af | 1621 | |
58eb9381 | 1622 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1623 | if (ret < 0) { |
d3e2ba59 JD |
1624 | goto end; |
1625 | } | |
eea7556c | 1626 | health_code_update(); |
d3e2ba59 | 1627 | |
53efb85a MD |
1628 | memset(&reply, 0, sizeof(reply)); |
1629 | ||
7591bab1 MD |
1630 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
1631 | if (!vstream) { | |
3b463131 MD |
1632 | /* |
1633 | * The metadata stream can be closed by a CLOSE command | |
1634 | * just before we attach. It can also be closed by | |
1635 | * per-pid tracing during tracing. Therefore, it is | |
1636 | * possible that we cannot find this viewer stream. | |
1637 | * Reply back to the client with an error if we cannot | |
1638 | * find it. | |
1639 | */ | |
1640 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); | |
7591bab1 | 1641 | goto send_reply; |
d3e2ba59 | 1642 | } |
7591bab1 MD |
1643 | pthread_mutex_lock(&vstream->stream->lock); |
1644 | if (!vstream->stream->is_metadata) { | |
1645 | ERR("Invalid metadata stream"); | |
6763619c JD |
1646 | goto error; |
1647 | } | |
1648 | ||
7591bab1 | 1649 | assert(vstream->metadata_sent <= vstream->stream->metadata_received); |
2a174661 | 1650 | |
7591bab1 | 1651 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
d3e2ba59 | 1652 | if (len == 0) { |
c4e361a4 | 1653 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
d3e2ba59 JD |
1654 | goto send_reply; |
1655 | } | |
1656 | ||
1657 | /* first time, we open the metadata file */ | |
7591bab1 | 1658 | if (!vstream->stream_fd) { |
d3e2ba59 JD |
1659 | char fullpath[PATH_MAX]; |
1660 | ||
7591bab1 MD |
1661 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", vstream->path_name, |
1662 | vstream->channel_name); | |
d3e2ba59 JD |
1663 | if (ret < 0) { |
1664 | goto error; | |
1665 | } | |
1666 | ret = open(fullpath, O_RDONLY); | |
1667 | if (ret < 0) { | |
1668 | PERROR("Relay opening metadata file"); | |
1669 | goto error; | |
1670 | } | |
7591bab1 MD |
1671 | vstream->stream_fd = stream_fd_create(ret); |
1672 | if (!vstream->stream_fd) { | |
1673 | if (close(ret)) { | |
1674 | PERROR("close"); | |
1675 | } | |
1676 | goto error; | |
1677 | } | |
d3e2ba59 JD |
1678 | } |
1679 | ||
1680 | reply.len = htobe64(len); | |
1681 | data = zmalloc(len); | |
1682 | if (!data) { | |
1683 | PERROR("viewer metadata zmalloc"); | |
1684 | goto error; | |
1685 | } | |
1686 | ||
7591bab1 | 1687 | read_len = lttng_read(vstream->stream_fd->fd, data, len); |
6cd525e8 | 1688 | if (read_len < len) { |
d3e2ba59 JD |
1689 | PERROR("Relay reading metadata file"); |
1690 | goto error; | |
1691 | } | |
7591bab1 MD |
1692 | vstream->metadata_sent += read_len; |
1693 | if (vstream->metadata_sent == vstream->stream->metadata_received | |
1694 | && vstream->stream->closed) { | |
1695 | /* Release ownership for the viewer metadata stream. */ | |
1696 | viewer_stream_put(vstream); | |
1697 | } | |
1698 | ||
c4e361a4 | 1699 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
7591bab1 | 1700 | |
d3e2ba59 JD |
1701 | goto send_reply; |
1702 | ||
1703 | error: | |
c4e361a4 | 1704 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
1705 | |
1706 | send_reply: | |
eea7556c | 1707 | health_code_update(); |
7591bab1 MD |
1708 | if (vstream) { |
1709 | pthread_mutex_unlock(&vstream->stream->lock); | |
1710 | } | |
58eb9381 | 1711 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1712 | if (ret < 0) { |
7591bab1 | 1713 | goto end_free; |
d3e2ba59 | 1714 | } |
eea7556c | 1715 | health_code_update(); |
d3e2ba59 JD |
1716 | |
1717 | if (len > 0) { | |
58eb9381 | 1718 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1719 | if (ret < 0) { |
7591bab1 | 1720 | goto end_free; |
d3e2ba59 JD |
1721 | } |
1722 | } | |
1723 | ||
1724 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
1725 | be64toh(request.stream_id)); | |
1726 | ||
1727 | DBG("Metadata sent"); | |
1728 | ||
7591bab1 | 1729 | end_free: |
d3e2ba59 | 1730 | free(data); |
d3e2ba59 | 1731 | end: |
7591bab1 MD |
1732 | if (vstream) { |
1733 | viewer_stream_put(vstream); | |
1734 | } | |
d3e2ba59 JD |
1735 | return ret; |
1736 | } | |
1737 | ||
c3b7390b JD |
1738 | /* |
1739 | * Create a viewer session. | |
1740 | * | |
1741 | * Return 0 on success or else a negative value. | |
1742 | */ | |
1743 | static | |
1744 | int viewer_create_session(struct relay_connection *conn) | |
1745 | { | |
1746 | int ret; | |
1747 | struct lttng_viewer_create_session_response resp; | |
1748 | ||
1749 | DBG("Viewer create session received"); | |
1750 | ||
53efb85a | 1751 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 1752 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
7591bab1 | 1753 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
1754 | if (!conn->viewer_session) { |
1755 | ERR("Allocation viewer session"); | |
1756 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
1757 | goto send_reply; | |
1758 | } | |
c3b7390b JD |
1759 | |
1760 | send_reply: | |
1761 | health_code_update(); | |
1762 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
1763 | if (ret < 0) { | |
1764 | goto end; | |
1765 | } | |
1766 | health_code_update(); | |
1767 | ret = 0; | |
1768 | ||
1769 | end: | |
1770 | return ret; | |
1771 | } | |
1772 | ||
1773 | ||
d3e2ba59 JD |
1774 | /* |
1775 | * live_relay_unknown_command: send -1 if received unknown command | |
1776 | */ | |
1777 | static | |
58eb9381 | 1778 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
1779 | { |
1780 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 1781 | |
53efb85a | 1782 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 1783 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 1784 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
1785 | } |
1786 | ||
1787 | /* | |
1788 | * Process the commands received on the control socket | |
1789 | */ | |
1790 | static | |
1791 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 1792 | struct relay_connection *conn) |
d3e2ba59 JD |
1793 | { |
1794 | int ret = 0; | |
2f8f53af DG |
1795 | uint32_t msg_value; |
1796 | ||
2f8f53af DG |
1797 | msg_value = be32toh(recv_hdr->cmd); |
1798 | ||
1799 | /* | |
1800 | * Make sure we've done the version check before any command other then a | |
1801 | * new client connection. | |
1802 | */ | |
c4e361a4 | 1803 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 1804 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
1805 | ret = -1; |
1806 | goto end; | |
1807 | } | |
d3e2ba59 | 1808 | |
2f8f53af | 1809 | switch (msg_value) { |
c4e361a4 | 1810 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 1811 | ret = viewer_connect(conn); |
d3e2ba59 | 1812 | break; |
c4e361a4 | 1813 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 1814 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 1815 | break; |
c4e361a4 | 1816 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 1817 | ret = viewer_attach_session(conn); |
d3e2ba59 | 1818 | break; |
c4e361a4 | 1819 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 1820 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 1821 | break; |
c4e361a4 | 1822 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 1823 | ret = viewer_get_packet(conn); |
d3e2ba59 | 1824 | break; |
c4e361a4 | 1825 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 1826 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 1827 | break; |
c4e361a4 | 1828 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 1829 | ret = viewer_get_new_streams(conn); |
80e8027a | 1830 | break; |
c3b7390b JD |
1831 | case LTTNG_VIEWER_CREATE_SESSION: |
1832 | ret = viewer_create_session(conn); | |
1833 | break; | |
d3e2ba59 | 1834 | default: |
7591bab1 MD |
1835 | ERR("Received unknown viewer command (%u)", |
1836 | be32toh(recv_hdr->cmd)); | |
58eb9381 | 1837 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
1838 | ret = -1; |
1839 | goto end; | |
1840 | } | |
1841 | ||
1842 | end: | |
1843 | return ret; | |
1844 | } | |
1845 | ||
1846 | static | |
58eb9381 | 1847 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
1848 | { |
1849 | int ret; | |
1850 | ||
58eb9381 | 1851 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 JD |
1852 | |
1853 | ret = close(pollfd); | |
1854 | if (ret < 0) { | |
1855 | ERR("Closing pollfd %d", pollfd); | |
1856 | } | |
1857 | } | |
1858 | ||
d3e2ba59 JD |
1859 | /* |
1860 | * This thread does the actual work | |
1861 | */ | |
1862 | static | |
1863 | void *thread_worker(void *data) | |
1864 | { | |
1865 | int ret, err = -1; | |
1866 | uint32_t nb_fd; | |
d3e2ba59 | 1867 | struct lttng_poll_event events; |
7591bab1 | 1868 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 JD |
1869 | struct lttng_ht_iter iter; |
1870 | struct lttng_viewer_cmd recv_hdr; | |
302d8906 | 1871 | struct relay_connection *destroy_conn; |
d3e2ba59 JD |
1872 | |
1873 | DBG("[thread] Live viewer relay worker started"); | |
1874 | ||
1875 | rcu_register_thread(); | |
1876 | ||
eea7556c MD |
1877 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
1878 | ||
9b5e0863 MD |
1879 | if (testpoint(relayd_thread_live_worker)) { |
1880 | goto error_testpoint; | |
1881 | } | |
1882 | ||
d3e2ba59 | 1883 | /* table of connections indexed on socket */ |
7591bab1 MD |
1884 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1885 | if (!viewer_connections_ht) { | |
1886 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
1887 | } |
1888 | ||
1889 | ret = create_thread_poll_set(&events, 2); | |
1890 | if (ret < 0) { | |
1891 | goto error_poll_create; | |
1892 | } | |
1893 | ||
58eb9381 | 1894 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
1895 | if (ret < 0) { |
1896 | goto error; | |
1897 | } | |
1898 | ||
1899 | restart: | |
1900 | while (1) { | |
1901 | int i; | |
1902 | ||
eea7556c MD |
1903 | health_code_update(); |
1904 | ||
d3e2ba59 JD |
1905 | /* Infinite blocking call, waiting for transmission */ |
1906 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 1907 | health_poll_entry(); |
d3e2ba59 | 1908 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 1909 | health_poll_exit(); |
d3e2ba59 JD |
1910 | if (ret < 0) { |
1911 | /* | |
1912 | * Restart interrupted system call. | |
1913 | */ | |
1914 | if (errno == EINTR) { | |
1915 | goto restart; | |
1916 | } | |
1917 | goto error; | |
1918 | } | |
1919 | ||
1920 | nb_fd = ret; | |
1921 | ||
1922 | /* | |
1923 | * Process control. The control connection is prioritised so we don't | |
1924 | * starve it with high throughput tracing data on the data | |
1925 | * connection. | |
1926 | */ | |
1927 | for (i = 0; i < nb_fd; i++) { | |
1928 | /* Fetch once the poll data */ | |
1929 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1930 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1931 | ||
eea7556c MD |
1932 | health_code_update(); |
1933 | ||
fd20dac9 MD |
1934 | if (!revents) { |
1935 | /* No activity for this FD (poll implementation). */ | |
1936 | continue; | |
1937 | } | |
1938 | ||
d3e2ba59 | 1939 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 1940 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
1941 | if (ret) { |
1942 | err = 0; | |
1943 | goto exit; | |
1944 | } | |
1945 | ||
7591bab1 | 1946 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 1947 | if (pollfd == live_conn_pipe[0]) { |
d3e2ba59 JD |
1948 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1949 | ERR("Relay live pipe error"); | |
1950 | goto error; | |
1951 | } else if (revents & LPOLLIN) { | |
302d8906 JG |
1952 | struct relay_connection *conn; |
1953 | ||
7591bab1 MD |
1954 | ret = lttng_read(live_conn_pipe[0], |
1955 | &conn, sizeof(conn)); | |
d3e2ba59 JD |
1956 | if (ret < 0) { |
1957 | goto error; | |
1958 | } | |
58eb9381 DG |
1959 | lttng_poll_add(&events, conn->sock->fd, |
1960 | LPOLLIN | LPOLLRDHUP); | |
7591bab1 MD |
1961 | connection_ht_add(viewer_connections_ht, conn); |
1962 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
d3e2ba59 | 1963 | } |
58eb9381 | 1964 | } else { |
7591bab1 | 1965 | /* Connection activity. */ |
302d8906 JG |
1966 | struct relay_connection *conn; |
1967 | ||
7591bab1 MD |
1968 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
1969 | if (!conn) { | |
1970 | continue; | |
1971 | } | |
58eb9381 DG |
1972 | |
1973 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1974 | cleanup_connection_pollfd(&events, pollfd); | |
7591bab1 MD |
1975 | /* Put "create" ownership reference. */ |
1976 | connection_put(conn); | |
d3e2ba59 | 1977 | } else if (revents & LPOLLIN) { |
58eb9381 DG |
1978 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
1979 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 1980 | if (ret <= 0) { |
7591bab1 | 1981 | /* Connection closed. */ |
58eb9381 | 1982 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
1983 | /* Put "create" ownership reference. */ |
1984 | connection_put(conn); | |
58eb9381 | 1985 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 1986 | } else { |
58eb9381 | 1987 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
1988 | if (ret < 0) { |
1989 | /* Clear the session on error. */ | |
58eb9381 | 1990 | cleanup_connection_pollfd(&events, pollfd); |
7591bab1 MD |
1991 | /* Put "create" ownership reference. */ |
1992 | connection_put(conn); | |
d3e2ba59 JD |
1993 | DBG("Viewer connection closed with %d", pollfd); |
1994 | } | |
1995 | } | |
1996 | } | |
7591bab1 MD |
1997 | /* Put local "get_by_sock" reference. */ |
1998 | connection_put(conn); | |
d3e2ba59 JD |
1999 | } |
2000 | } | |
2001 | } | |
2002 | ||
2003 | exit: | |
2004 | error: | |
2005 | lttng_poll_clean(&events); | |
2006 | ||
58eb9381 | 2007 | /* Cleanup reamaining connection object. */ |
d3e2ba59 | 2008 | rcu_read_lock(); |
7591bab1 | 2009 | cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter, |
302d8906 | 2010 | destroy_conn, |
58eb9381 | 2011 | sock_n.node) { |
eea7556c | 2012 | health_code_update(); |
7591bab1 | 2013 | connection_put(destroy_conn); |
d3e2ba59 JD |
2014 | } |
2015 | rcu_read_unlock(); | |
2016 | error_poll_create: | |
7591bab1 MD |
2017 | lttng_ht_destroy(viewer_connections_ht); |
2018 | viewer_connections_ht_error: | |
58eb9381 DG |
2019 | /* Close relay conn pipes */ |
2020 | utils_close_pipe(live_conn_pipe); | |
d3e2ba59 JD |
2021 | if (err) { |
2022 | DBG("Viewer worker thread exited with error"); | |
2023 | } | |
2024 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2025 | error_testpoint: |
eea7556c MD |
2026 | if (err) { |
2027 | health_error(); | |
2028 | ERR("Health error occurred in %s", __func__); | |
2029 | } | |
2030 | health_unregister(health_relayd); | |
b4aacfdc MD |
2031 | if (lttng_relay_stop_threads()) { |
2032 | ERR("Error stopping threads"); | |
178a0557 | 2033 | } |
d3e2ba59 JD |
2034 | rcu_unregister_thread(); |
2035 | return NULL; | |
2036 | } | |
2037 | ||
2038 | /* | |
2039 | * Create the relay command pipe to wake thread_manage_apps. | |
2040 | * Closed in cleanup(). | |
2041 | */ | |
58eb9381 | 2042 | static int create_conn_pipe(void) |
d3e2ba59 | 2043 | { |
178a0557 MD |
2044 | return utils_create_pipe_cloexec(live_conn_pipe); |
2045 | } | |
d3e2ba59 | 2046 | |
178a0557 | 2047 | int relayd_live_join(void) |
d3e2ba59 | 2048 | { |
178a0557 | 2049 | int ret, retval = 0; |
d3e2ba59 JD |
2050 | void *status; |
2051 | ||
d3e2ba59 | 2052 | ret = pthread_join(live_listener_thread, &status); |
178a0557 MD |
2053 | if (ret) { |
2054 | errno = ret; | |
d3e2ba59 | 2055 | PERROR("pthread_join live listener"); |
178a0557 | 2056 | retval = -1; |
d3e2ba59 JD |
2057 | } |
2058 | ||
2059 | ret = pthread_join(live_worker_thread, &status); | |
178a0557 MD |
2060 | if (ret) { |
2061 | errno = ret; | |
d3e2ba59 | 2062 | PERROR("pthread_join live worker"); |
178a0557 | 2063 | retval = -1; |
d3e2ba59 JD |
2064 | } |
2065 | ||
2066 | ret = pthread_join(live_dispatcher_thread, &status); | |
178a0557 MD |
2067 | if (ret) { |
2068 | errno = ret; | |
d3e2ba59 | 2069 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2070 | retval = -1; |
d3e2ba59 JD |
2071 | } |
2072 | ||
178a0557 | 2073 | cleanup_relayd_live(); |
d3e2ba59 | 2074 | |
178a0557 | 2075 | return retval; |
d3e2ba59 JD |
2076 | } |
2077 | ||
2078 | /* | |
2079 | * main | |
2080 | */ | |
7591bab1 | 2081 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2082 | { |
178a0557 | 2083 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2084 | void *status; |
2085 | int is_root; | |
2086 | ||
178a0557 MD |
2087 | if (!uri) { |
2088 | retval = -1; | |
2089 | goto exit_init_data; | |
2090 | } | |
d3e2ba59 JD |
2091 | live_uri = uri; |
2092 | ||
d3e2ba59 JD |
2093 | /* Check if daemon is UID = 0 */ |
2094 | is_root = !getuid(); | |
2095 | ||
2096 | if (!is_root) { | |
2097 | if (live_uri->port < 1024) { | |
2098 | ERR("Need to be root to use ports < 1024"); | |
178a0557 MD |
2099 | retval = -1; |
2100 | goto exit_init_data; | |
d3e2ba59 JD |
2101 | } |
2102 | } | |
2103 | ||
2104 | /* Setup the thread apps communication pipe. */ | |
178a0557 MD |
2105 | if (create_conn_pipe()) { |
2106 | retval = -1; | |
2107 | goto exit_init_data; | |
d3e2ba59 JD |
2108 | } |
2109 | ||
2110 | /* Init relay command queue. */ | |
8bdee6e2 | 2111 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2112 | |
2113 | /* Set up max poll set size */ | |
25b397f9 MD |
2114 | if (lttng_poll_set_max_size()) { |
2115 | retval = -1; | |
2116 | goto exit_init_data; | |
2117 | } | |
d3e2ba59 JD |
2118 | |
2119 | /* Setup the dispatcher thread */ | |
2120 | ret = pthread_create(&live_dispatcher_thread, NULL, | |
2121 | thread_dispatcher, (void *) NULL); | |
178a0557 MD |
2122 | if (ret) { |
2123 | errno = ret; | |
d3e2ba59 | 2124 | PERROR("pthread_create viewer dispatcher"); |
178a0557 MD |
2125 | retval = -1; |
2126 | goto exit_dispatcher_thread; | |
d3e2ba59 JD |
2127 | } |
2128 | ||
2129 | /* Setup the worker thread */ | |
2130 | ret = pthread_create(&live_worker_thread, NULL, | |
7591bab1 | 2131 | thread_worker, NULL); |
178a0557 MD |
2132 | if (ret) { |
2133 | errno = ret; | |
d3e2ba59 | 2134 | PERROR("pthread_create viewer worker"); |
178a0557 MD |
2135 | retval = -1; |
2136 | goto exit_worker_thread; | |
d3e2ba59 JD |
2137 | } |
2138 | ||
2139 | /* Setup the listener thread */ | |
2140 | ret = pthread_create(&live_listener_thread, NULL, | |
2141 | thread_listener, (void *) NULL); | |
178a0557 MD |
2142 | if (ret) { |
2143 | errno = ret; | |
d3e2ba59 | 2144 | PERROR("pthread_create viewer listener"); |
178a0557 MD |
2145 | retval = -1; |
2146 | goto exit_listener_thread; | |
d3e2ba59 JD |
2147 | } |
2148 | ||
178a0557 MD |
2149 | /* |
2150 | * All OK, started all threads. | |
2151 | */ | |
2152 | return retval; | |
2153 | ||
9911d21b JG |
2154 | /* |
2155 | * Join on the live_listener_thread should anything be added after | |
2156 | * the live_listener thread's creation. | |
2157 | */ | |
d3e2ba59 | 2158 | |
178a0557 | 2159 | exit_listener_thread: |
d3e2ba59 | 2160 | |
d3e2ba59 | 2161 | ret = pthread_join(live_worker_thread, &status); |
178a0557 MD |
2162 | if (ret) { |
2163 | errno = ret; | |
d3e2ba59 | 2164 | PERROR("pthread_join live worker"); |
178a0557 | 2165 | retval = -1; |
d3e2ba59 | 2166 | } |
178a0557 | 2167 | exit_worker_thread: |
d3e2ba59 | 2168 | |
d3e2ba59 | 2169 | ret = pthread_join(live_dispatcher_thread, &status); |
178a0557 MD |
2170 | if (ret) { |
2171 | errno = ret; | |
d3e2ba59 | 2172 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2173 | retval = -1; |
d3e2ba59 | 2174 | } |
178a0557 | 2175 | exit_dispatcher_thread: |
d3e2ba59 | 2176 | |
178a0557 MD |
2177 | exit_init_data: |
2178 | cleanup_relayd_live(); | |
d3e2ba59 | 2179 | |
178a0557 | 2180 | return retval; |
d3e2ba59 | 2181 | } |