Fix: steal channel key in the consumer to avoid race
[lttng-tools.git] / src / bin / lttng-relayd / live.c
CommitLineData
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1/*
2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19#define _GNU_SOURCE
20#include <getopt.h>
21#include <grp.h>
22#include <limits.h>
23#include <pthread.h>
24#include <signal.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <string.h>
28#include <sys/mman.h>
29#include <sys/mount.h>
30#include <sys/resource.h>
31#include <sys/socket.h>
32#include <sys/stat.h>
33#include <sys/types.h>
34#include <sys/wait.h>
35#include <inttypes.h>
36#include <urcu/futex.h>
37#include <urcu/uatomic.h>
38#include <unistd.h>
39#include <fcntl.h>
40#include <config.h>
41
42#include <lttng/lttng.h>
43#include <common/common.h>
44#include <common/compat/poll.h>
45#include <common/compat/socket.h>
46#include <common/defaults.h>
47#include <common/futex.h>
2f8f53af 48#include <common/index/index.h>
d3e2ba59
JD
49#include <common/sessiond-comm/sessiond-comm.h>
50#include <common/sessiond-comm/inet.h>
51#include <common/sessiond-comm/relayd.h>
52#include <common/uri.h>
53#include <common/utils.h>
54
55#include "cmd.h"
56#include "live.h"
57#include "lttng-relayd.h"
d3e2ba59 58#include "utils.h"
eea7556c 59#include "health-relayd.h"
9b5e0863 60#include "testpoint.h"
2f8f53af 61#include "viewer-stream.h"
2a174661
DG
62#include "stream.h"
63#include "session.h"
64#include "ctf-trace.h"
58eb9381 65#include "connection.h"
d3e2ba59
JD
66
67static struct lttng_uri *live_uri;
68
d3e2ba59
JD
69/*
70 * This pipe is used to inform the worker thread that a command is queued and
71 * ready to be processed.
72 */
58eb9381 73static int live_conn_pipe[2] = { -1, -1 };
d3e2ba59
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74
75/* Shared between threads */
76static int live_dispatch_thread_exit;
77
78static pthread_t live_listener_thread;
79static pthread_t live_dispatcher_thread;
80static pthread_t live_worker_thread;
81
82/*
83 * Relay command queue.
84 *
85 * The live_thread_listener and live_thread_dispatcher communicate with this
86 * queue.
87 */
58eb9381 88static struct relay_conn_queue viewer_conn_queue;
d3e2ba59
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89
90static uint64_t last_relay_viewer_session_id;
91
92/*
93 * Cleanup the daemon
94 */
95static
96void cleanup(void)
97{
98 DBG("Cleaning up");
99
d3e2ba59
JD
100 free(live_uri);
101}
102
2f8f53af
DG
103/*
104 * Receive a request buffer using a given socket, destination allocated buffer
105 * of length size.
106 *
107 * Return the size of the received message or else a negative value on error
108 * with errno being set by recvmsg() syscall.
109 */
110static
111ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size)
112{
113 ssize_t ret;
114
115 assert(sock);
116 assert(buf);
117
118 ret = sock->ops->recvmsg(sock, buf, size, 0);
119 if (ret < 0 || ret != size) {
120 if (ret == 0) {
121 /* Orderly shutdown. Not necessary to print an error. */
122 DBG("Socket %d did an orderly shutdown", sock->fd);
123 } else {
124 ERR("Relay failed to receive request.");
125 }
126 ret = -1;
127 }
128
129 return ret;
130}
131
132/*
133 * Send a response buffer using a given socket, source allocated buffer of
134 * length size.
135 *
136 * Return the size of the sent message or else a negative value on error with
137 * errno being set by sendmsg() syscall.
138 */
139static
140ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size)
141{
142 ssize_t ret;
143
144 assert(sock);
145 assert(buf);
146
147 ret = sock->ops->sendmsg(sock, buf, size, 0);
148 if (ret < 0) {
149 ERR("Relayd failed to send response.");
150 }
151
152 return ret;
153}
154
155/*
f04a971b
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156 * Atomically check if new streams got added in one of the sessions attached
157 * and reset the flag to 0.
2f8f53af
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158 *
159 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
160 * on error.
161 */
162static
f04a971b 163int check_new_streams(struct relay_connection *conn)
2f8f53af 164{
2f8f53af 165 struct relay_session *session;
f04a971b
JD
166 unsigned long current_val;
167 int ret = 0;
2f8f53af 168
f04a971b
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169 if (!conn->viewer_session) {
170 goto end;
171 }
172 cds_list_for_each_entry(session,
173 &conn->viewer_session->sessions_head,
174 viewer_session_list) {
175 current_val = uatomic_cmpxchg(&session->new_streams, 1, 0);
176 ret = current_val;
177 if (ret == 1) {
178 goto end;
179 }
2f8f53af
DG
180 }
181
f04a971b 182end:
2f8f53af
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183 return ret;
184}
185
186/*
187 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
188 * this function should ignore the sent flag or not.
189 *
190 * Return 0 on success or else a negative value.
191 */
192static
193ssize_t send_viewer_streams(struct lttcomm_sock *sock,
194 struct relay_session *session, unsigned int ignore_sent_flag)
195{
196 ssize_t ret;
197 struct lttng_viewer_stream send_stream;
198 struct lttng_ht_iter iter;
199 struct relay_viewer_stream *vstream;
200
201 assert(session);
202
203 rcu_read_lock();
204
205 cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream,
206 stream_n.node) {
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207 struct ctf_trace *ctf_trace;
208
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209 health_code_update();
210
211 /* Ignore if not the same session. */
212 if (vstream->session_id != session->id ||
213 (!ignore_sent_flag && vstream->sent_flag)) {
214 continue;
215 }
216
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217 ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht,
218 vstream->path_name);
219 assert(ctf_trace);
220
2f8f53af 221 send_stream.id = htobe64(vstream->stream_handle);
2a174661 222 send_stream.ctf_trace_id = htobe64(ctf_trace->id);
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223 send_stream.metadata_flag = htobe32(vstream->metadata_flag);
224 strncpy(send_stream.path_name, vstream->path_name,
225 sizeof(send_stream.path_name));
226 strncpy(send_stream.channel_name, vstream->channel_name,
227 sizeof(send_stream.channel_name));
228
229 DBG("Sending stream %" PRIu64 " to viewer", vstream->stream_handle);
230 ret = send_response(sock, &send_stream, sizeof(send_stream));
231 if (ret < 0) {
232 goto end_unlock;
233 }
234 vstream->sent_flag = 1;
235 }
236
237 ret = 0;
238
239end_unlock:
240 rcu_read_unlock();
241 return ret;
242}
243
244/*
245 * Create every viewer stream possible for the given session with the seek
246 * type. Three counters *can* be return which are in order the total amount of
247 * viewer stream of the session, the number of unsent stream and the number of
248 * stream created. Those counters can be NULL and thus will be ignored.
249 *
250 * Return 0 on success or else a negative value.
251 */
252static
253int make_viewer_streams(struct relay_session *session,
254 enum lttng_viewer_seek seek_t, uint32_t *nb_total, uint32_t *nb_unsent,
255 uint32_t *nb_created)
256{
257 int ret;
2f8f53af 258 struct lttng_ht_iter iter;
2a174661 259 struct ctf_trace *ctf_trace;
2f8f53af
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260
261 assert(session);
262
263 /*
264 * This is to make sure we create viewer streams for a full received
265 * channel. For instance, if we have 8 streams for a channel that are
266 * concurrently being flagged ready, we can end up creating just a subset
267 * of the 8 streams (the ones that are flagged). This lock avoids this
268 * limbo state.
269 */
270 pthread_mutex_lock(&session->viewer_ready_lock);
271
272 /*
273 * Create viewer streams for relay streams that are ready to be used for a
274 * the given session id only.
275 */
2a174661
DG
276 rcu_read_lock();
277 cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace,
278 node.node) {
279 struct relay_stream *stream;
2f8f53af
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280
281 health_code_update();
282
2a174661 283 if (ctf_trace->invalid_flag) {
2f8f53af
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284 continue;
285 }
286
2a174661
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287 cds_list_for_each_entry(stream, &ctf_trace->stream_list, trace_list) {
288 struct relay_viewer_stream *vstream;
289
290 if (!stream->viewer_ready) {
291 continue;
292 }
293
294 vstream = viewer_stream_find_by_id(stream->stream_handle);
2f8f53af 295 if (!vstream) {
2a174661
DG
296 vstream = viewer_stream_create(stream, seek_t, ctf_trace);
297 if (!vstream) {
298 ret = -1;
299 goto error_unlock;
300 }
301 /* Acquire reference to ctf_trace. */
302 ctf_trace_get_ref(ctf_trace);
303
304 if (nb_created) {
305 /* Update number of created stream counter. */
306 (*nb_created)++;
307 }
308 } else if (!vstream->sent_flag && nb_unsent) {
309 /* Update number of unsent stream counter. */
310 (*nb_unsent)++;
2f8f53af 311 }
2a174661
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312 /* Update number of total stream counter. */
313 if (nb_total) {
314 (*nb_total)++;
2f8f53af 315 }
2f8f53af
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316 }
317 }
318
319 ret = 0;
320
321error_unlock:
2a174661 322 rcu_read_unlock();
2f8f53af
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323 pthread_mutex_unlock(&session->viewer_ready_lock);
324 return ret;
325}
326
d3e2ba59
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327/*
328 * Write to writable pipe used to notify a thread.
329 */
330static
331int notify_thread_pipe(int wpipe)
332{
6cd525e8 333 ssize_t ret;
d3e2ba59 334
6cd525e8
MD
335 ret = lttng_write(wpipe, "!", 1);
336 if (ret < 1) {
d3e2ba59
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337 PERROR("write poll pipe");
338 }
339
6cd525e8 340 return (int) ret;
d3e2ba59
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341}
342
343/*
344 * Stop all threads by closing the thread quit pipe.
345 */
346static
347void stop_threads(void)
348{
349 int ret;
350
351 /* Stopping all threads */
352 DBG("Terminating all live threads");
bcf4a440 353 ret = notify_thread_pipe(thread_quit_pipe[1]);
d3e2ba59
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354 if (ret < 0) {
355 ERR("write error on thread quit pipe");
356 }
357
358 /* Dispatch thread */
359 CMM_STORE_SHARED(live_dispatch_thread_exit, 1);
58eb9381 360 futex_nto1_wake(&viewer_conn_queue.futex);
d3e2ba59
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361}
362
d3e2ba59
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363/*
364 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
365 */
366static
367int 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
389error:
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 */
398static
bcf4a440 399int 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 */
411static
412struct 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
442error:
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 */
452static
453void *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
494restart:
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
517 /* Thread quit pipe has been closed. Killing thread. */
bcf4a440 518 ret = check_thread_quit_pipe(pollfd, revents);
d3e2ba59
JD
519 if (ret) {
520 err = 0;
521 goto exit;
522 }
523
524 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
525 ERR("socket poll error");
526 goto error;
527 } else if (revents & LPOLLIN) {
528 /*
529 * Get allocated in this thread, enqueued to a global queue,
530 * dequeued and freed in the worker thread.
531 */
58eb9381
DG
532 int val = 1;
533 struct relay_connection *new_conn;
d3e2ba59
JD
534 struct lttcomm_sock *newsock;
535
58eb9381
DG
536 new_conn = connection_create();
537 if (!new_conn) {
d3e2ba59
JD
538 goto error;
539 }
540
d3e2ba59
JD
541 newsock = live_control_sock->ops->accept(live_control_sock);
542 if (!newsock) {
543 PERROR("accepting control sock");
58eb9381 544 connection_free(new_conn);
d3e2ba59
JD
545 goto error;
546 }
547 DBG("Relay viewer connection accepted socket %d", newsock->fd);
58eb9381 548
d3e2ba59 549 ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val,
58eb9381 550 sizeof(val));
d3e2ba59
JD
551 if (ret < 0) {
552 PERROR("setsockopt inet");
553 lttcomm_destroy_sock(newsock);
58eb9381 554 connection_free(new_conn);
d3e2ba59
JD
555 goto error;
556 }
58eb9381 557 new_conn->sock = newsock;
d3e2ba59 558
58eb9381
DG
559 /* Enqueue request for the dispatcher thread. */
560 cds_wfq_enqueue(&viewer_conn_queue.queue, &new_conn->qnode);
d3e2ba59
JD
561
562 /*
58eb9381
DG
563 * Wake the dispatch queue futex. Implicit memory barrier with
564 * the exchange in cds_wfq_enqueue.
d3e2ba59 565 */
58eb9381 566 futex_nto1_wake(&viewer_conn_queue.futex);
d3e2ba59
JD
567 }
568 }
569 }
570
571exit:
572error:
573error_poll_add:
9b5e0863 574error_testpoint:
d3e2ba59
JD
575 lttng_poll_clean(&events);
576error_create_poll:
577 if (live_control_sock->fd >= 0) {
578 ret = live_control_sock->ops->close(live_control_sock);
579 if (ret) {
580 PERROR("close");
581 }
582 }
583 lttcomm_destroy_sock(live_control_sock);
584error_sock_control:
585 if (err) {
eea7556c 586 health_error();
d3e2ba59
JD
587 DBG("Live viewer listener thread exited with error");
588 }
eea7556c 589 health_unregister(health_relayd);
d3e2ba59
JD
590 DBG("Live viewer listener thread cleanup complete");
591 stop_threads();
592 return NULL;
593}
594
595/*
596 * This thread manages the dispatching of the requests to worker threads
597 */
598static
599void *thread_dispatcher(void *data)
600{
6cd525e8
MD
601 int err = -1;
602 ssize_t ret;
d3e2ba59 603 struct cds_wfq_node *node;
58eb9381 604 struct relay_connection *conn = NULL;
d3e2ba59
JD
605
606 DBG("[thread] Live viewer relay dispatcher started");
607
eea7556c
MD
608 health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER);
609
9b5e0863
MD
610 if (testpoint(relayd_thread_live_dispatcher)) {
611 goto error_testpoint;
612 }
613
eea7556c
MD
614 health_code_update();
615
d3e2ba59 616 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) {
eea7556c
MD
617 health_code_update();
618
d3e2ba59 619 /* Atomically prepare the queue futex */
58eb9381 620 futex_nto1_prepare(&viewer_conn_queue.futex);
d3e2ba59
JD
621
622 do {
eea7556c
MD
623 health_code_update();
624
d3e2ba59 625 /* Dequeue commands */
58eb9381 626 node = cds_wfq_dequeue_blocking(&viewer_conn_queue.queue);
d3e2ba59
JD
627 if (node == NULL) {
628 DBG("Woken up but nothing in the live-viewer "
629 "relay command queue");
630 /* Continue thread execution */
631 break;
632 }
58eb9381 633 conn = caa_container_of(node, struct relay_connection, qnode);
d3e2ba59 634 DBG("Dispatching viewer request waiting on sock %d",
58eb9381 635 conn->sock->fd);
d3e2ba59
JD
636
637 /*
638 * Inform worker thread of the new request. This call is blocking
639 * so we can be assured that the data will be read at some point in
640 * time or wait to the end of the world :)
641 */
58eb9381
DG
642 ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn));
643 if (ret < 0) {
644 PERROR("write conn pipe");
645 connection_destroy(conn);
d3e2ba59
JD
646 goto error;
647 }
648 } while (node != NULL);
649
650 /* Futex wait on queue. Blocking call on futex() */
eea7556c 651 health_poll_entry();
58eb9381 652 futex_nto1_wait(&viewer_conn_queue.futex);
eea7556c 653 health_poll_exit();
d3e2ba59
JD
654 }
655
eea7556c
MD
656 /* Normal exit, no error */
657 err = 0;
658
d3e2ba59 659error:
9b5e0863 660error_testpoint:
eea7556c
MD
661 if (err) {
662 health_error();
663 ERR("Health error occurred in %s", __func__);
664 }
665 health_unregister(health_relayd);
d3e2ba59
JD
666 DBG("Live viewer dispatch thread dying");
667 stop_threads();
668 return NULL;
669}
670
671/*
672 * Establish connection with the viewer and check the versions.
673 *
674 * Return 0 on success or else negative value.
675 */
676static
58eb9381 677int viewer_connect(struct relay_connection *conn)
d3e2ba59
JD
678{
679 int ret;
680 struct lttng_viewer_connect reply, msg;
681
58eb9381 682 assert(conn);
d3e2ba59 683
58eb9381 684 conn->version_check_done = 1;
d3e2ba59 685
eea7556c
MD
686 health_code_update();
687
2f8f53af
DG
688 DBG("Viewer is establishing a connection to the relayd.");
689
58eb9381 690 ret = recv_request(conn->sock, &msg, sizeof(msg));
2f8f53af 691 if (ret < 0) {
d3e2ba59
JD
692 goto end;
693 }
694
eea7556c
MD
695 health_code_update();
696
f46b2ce6 697 memset(&reply, 0, sizeof(reply));
d3e2ba59
JD
698 reply.major = RELAYD_VERSION_COMM_MAJOR;
699 reply.minor = RELAYD_VERSION_COMM_MINOR;
700
701 /* Major versions must be the same */
702 if (reply.major != be32toh(msg.major)) {
2f8f53af
DG
703 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
704 reply.major, be32toh(msg.major));
72180669 705 ret = -1;
d3e2ba59
JD
706 goto end;
707 }
708
58eb9381 709 conn->major = reply.major;
d3e2ba59
JD
710 /* We adapt to the lowest compatible version */
711 if (reply.minor <= be32toh(msg.minor)) {
58eb9381 712 conn->minor = reply.minor;
d3e2ba59 713 } else {
58eb9381 714 conn->minor = be32toh(msg.minor);
d3e2ba59
JD
715 }
716
c4e361a4 717 if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) {
58eb9381 718 conn->type = RELAY_VIEWER_COMMAND;
c4e361a4 719 } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) {
58eb9381 720 conn->type = RELAY_VIEWER_NOTIFICATION;
d3e2ba59
JD
721 } else {
722 ERR("Unknown connection type : %u", be32toh(msg.type));
723 ret = -1;
724 goto end;
725 }
726
727 reply.major = htobe32(reply.major);
728 reply.minor = htobe32(reply.minor);
58eb9381 729 if (conn->type == RELAY_VIEWER_COMMAND) {
d3e2ba59
JD
730 reply.viewer_session_id = htobe64(++last_relay_viewer_session_id);
731 }
eea7556c
MD
732
733 health_code_update();
734
58eb9381 735 ret = send_response(conn->sock, &reply, sizeof(reply));
d3e2ba59 736 if (ret < 0) {
2f8f53af 737 goto end;
d3e2ba59
JD
738 }
739
eea7556c
MD
740 health_code_update();
741
58eb9381 742 DBG("Version check done using protocol %u.%u", conn->major, conn->minor);
d3e2ba59
JD
743 ret = 0;
744
745end:
746 return ret;
747}
748
749/*
750 * Send the viewer the list of current sessions.
751 *
752 * Return 0 on success or else a negative value.
753 */
754static
58eb9381 755int viewer_list_sessions(struct relay_connection *conn)
d3e2ba59
JD
756{
757 int ret;
758 struct lttng_viewer_list_sessions session_list;
759 unsigned long count;
760 long approx_before, approx_after;
d3e2ba59
JD
761 struct lttng_ht_iter iter;
762 struct lttng_viewer_session send_session;
763 struct relay_session *session;
764
765 DBG("List sessions received");
766
d3e2ba59 767 rcu_read_lock();
58eb9381
DG
768 cds_lfht_count_nodes(conn->sessions_ht->ht, &approx_before, &count,
769 &approx_after);
d3e2ba59
JD
770 session_list.sessions_count = htobe32(count);
771
eea7556c
MD
772 health_code_update();
773
58eb9381 774 ret = send_response(conn->sock, &session_list, sizeof(session_list));
d3e2ba59 775 if (ret < 0) {
d3e2ba59
JD
776 goto end_unlock;
777 }
778
eea7556c
MD
779 health_code_update();
780
58eb9381 781 cds_lfht_for_each_entry(conn->sessions_ht->ht, &iter.iter, session,
2f8f53af 782 session_n.node) {
eea7556c
MD
783 health_code_update();
784
d3e2ba59
JD
785 strncpy(send_session.session_name, session->session_name,
786 sizeof(send_session.session_name));
787 strncpy(send_session.hostname, session->hostname,
788 sizeof(send_session.hostname));
789 send_session.id = htobe64(session->id);
790 send_session.live_timer = htobe32(session->live_timer);
2a174661 791 send_session.clients = htobe32(session->viewer_refcount);
87b576ec 792 send_session.streams = htobe32(session->stream_count);
d3e2ba59 793
eea7556c
MD
794 health_code_update();
795
58eb9381 796 ret = send_response(conn->sock, &send_session, sizeof(send_session));
d3e2ba59 797 if (ret < 0) {
d3e2ba59
JD
798 goto end_unlock;
799 }
800 }
eea7556c
MD
801 health_code_update();
802
d3e2ba59
JD
803 rcu_read_unlock();
804 ret = 0;
805 goto end;
806
807end_unlock:
808 rcu_read_unlock();
809
810end:
d3e2ba59
JD
811 return ret;
812}
813
6763619c
JD
814/*
815 * Check if a connection is attached to a session.
816 * Return 1 if attached, 0 if not attached, a negative value on error.
817 */
818static
819int session_attached(struct relay_connection *conn, uint64_t session_id)
820{
821 struct relay_session *session;
822 int found = 0;
823
824 if (!conn->viewer_session) {
825 goto end;
826 }
827 cds_list_for_each_entry(session,
828 &conn->viewer_session->sessions_head,
829 viewer_session_list) {
830 if (session->id == session_id) {
831 found = 1;
832 goto end;
833 }
834 }
835
836end:
837 return found;
838}
839
d227d5bd
JD
840/*
841 * Delete all streams for a specific session ID.
842 */
843static void destroy_viewer_streams_by_session(struct relay_session *session)
844{
845 struct relay_viewer_stream *stream;
846 struct lttng_ht_iter iter;
847
848 assert(session);
849
850 rcu_read_lock();
851 cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, stream,
852 stream_n.node) {
853 struct ctf_trace *ctf_trace;
854
855 health_code_update();
856 if (stream->session_id != session->id) {
857 continue;
858 }
859
860 ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht,
861 stream->path_name);
862 assert(ctf_trace);
863
864 viewer_stream_delete(stream);
865
866 if (stream->metadata_flag) {
867 ctf_trace->metadata_sent = 0;
868 ctf_trace->viewer_metadata_stream = NULL;
869 }
870
871 viewer_stream_destroy(ctf_trace, stream);
872 }
873 rcu_read_unlock();
874}
875
876static void try_destroy_streams(struct relay_session *session)
877{
878 struct ctf_trace *ctf_trace;
879 struct lttng_ht_iter iter;
880
881 assert(session);
882
883 cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace,
884 node.node) {
885 /* Attempt to destroy the ctf trace of that session. */
886 ctf_trace_try_destroy(session, ctf_trace);
887 }
888}
889
890/*
891 * Cleanup a session.
892 */
893static void cleanup_session(struct relay_connection *conn,
894 struct relay_session *session)
895{
896 /*
897 * Very important that this is done before destroying the session so we
898 * can put back every viewer stream reference from the ctf_trace.
899 */
900 destroy_viewer_streams_by_session(session);
901 try_destroy_streams(session);
902 cds_list_del(&session->viewer_session_list);
903 session_viewer_try_destroy(conn->sessions_ht, session);
904}
905
80e8027a
JD
906/*
907 * Send the viewer the list of current sessions.
908 */
909static
58eb9381 910int viewer_get_new_streams(struct relay_connection *conn)
80e8027a
JD
911{
912 int ret, send_streams = 0;
2f8f53af 913 uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0;
80e8027a
JD
914 struct lttng_viewer_new_streams_request request;
915 struct lttng_viewer_new_streams_response response;
80e8027a 916 struct relay_session *session;
6763619c 917 uint64_t session_id;
80e8027a 918
58eb9381 919 assert(conn);
80e8027a
JD
920
921 DBG("Get new streams received");
922
80e8027a
JD
923 health_code_update();
924
2f8f53af 925 /* Receive the request from the connected client. */
58eb9381 926 ret = recv_request(conn->sock, &request, sizeof(request));
2f8f53af 927 if (ret < 0) {
80e8027a
JD
928 goto error;
929 }
6763619c 930 session_id = be64toh(request.session_id);
80e8027a
JD
931
932 health_code_update();
933
934 rcu_read_lock();
6763619c 935 session = session_find_by_id(conn->sessions_ht, session_id);
2f8f53af 936 if (!session) {
6763619c 937 DBG("Relay session %" PRIu64 " not found", session_id);
c4e361a4 938 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR);
80e8027a
JD
939 goto send_reply;
940 }
941
6763619c 942 if (!session_attached(conn, session_id)) {
80e8027a 943 send_streams = 0;
c4e361a4 944 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR);
80e8027a
JD
945 goto send_reply;
946 }
947
6763619c
JD
948 send_streams = 1;
949 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK);
950
c4e361a4 951 ret = make_viewer_streams(session, LTTNG_VIEWER_SEEK_LAST, NULL, &nb_unsent,
2f8f53af
DG
952 &nb_created);
953 if (ret < 0) {
954 goto end_unlock;
955 }
956 /* Only send back the newly created streams with the unsent ones. */
957 nb_streams = nb_created + nb_unsent;
80e8027a
JD
958 response.streams_count = htobe32(nb_streams);
959
4479f682
JD
960 /*
961 * If the session is closed and we have no new streams to send,
962 * it means that the viewer has already received the whole trace
963 * for this session and should now close it.
964 */
965 if (nb_streams == 0 && session->close_flag) {
966 send_streams = 0;
967 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP);
6763619c
JD
968 /*
969 * Remove the session from the attached list of the connection
970 * and try to destroy it.
971 */
972 cds_list_del(&session->viewer_session_list);
d227d5bd 973 cleanup_session(conn, session);
4479f682
JD
974 goto send_reply;
975 }
976
80e8027a
JD
977send_reply:
978 health_code_update();
58eb9381 979 ret = send_response(conn->sock, &response, sizeof(response));
80e8027a 980 if (ret < 0) {
80e8027a
JD
981 goto end_unlock;
982 }
983 health_code_update();
984
985 /*
986 * Unknown or empty session, just return gracefully, the viewer knows what
987 * is happening.
988 */
989 if (!send_streams || !nb_streams) {
990 ret = 0;
991 goto end_unlock;
992 }
993
2f8f53af
DG
994 /*
995 * Send stream and *DON'T* ignore the sent flag so every viewer streams
996 * that were not sent from that point will be sent to the viewer.
997 */
58eb9381 998 ret = send_viewer_streams(conn->sock, session, 0);
2f8f53af
DG
999 if (ret < 0) {
1000 goto end_unlock;
80e8027a
JD
1001 }
1002
80e8027a
JD
1003end_unlock:
1004 rcu_read_unlock();
80e8027a
JD
1005error:
1006 return ret;
1007}
1008
d3e2ba59
JD
1009/*
1010 * Send the viewer the list of current sessions.
1011 */
1012static
58eb9381 1013int viewer_attach_session(struct relay_connection *conn)
d3e2ba59 1014{
2f8f53af
DG
1015 int send_streams = 0;
1016 ssize_t ret;
80e8027a 1017 uint32_t nb_streams = 0;
2f8f53af 1018 enum lttng_viewer_seek seek_type;
d3e2ba59
JD
1019 struct lttng_viewer_attach_session_request request;
1020 struct lttng_viewer_attach_session_response response;
d3e2ba59
JD
1021 struct relay_session *session;
1022
58eb9381 1023 assert(conn);
d3e2ba59 1024
eea7556c
MD
1025 health_code_update();
1026
2f8f53af 1027 /* Receive the request from the connected client. */
58eb9381 1028 ret = recv_request(conn->sock, &request, sizeof(request));
2f8f53af 1029 if (ret < 0) {
d3e2ba59
JD
1030 goto error;
1031 }
1032
eea7556c
MD
1033 health_code_update();
1034
c3b7390b
JD
1035 if (!conn->viewer_session) {
1036 DBG("Client trying to attach before creating a live viewer session");
1037 response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION);
1038 goto send_reply;
1039 }
1040
d3e2ba59 1041 rcu_read_lock();
58eb9381
DG
1042 session = session_find_by_id(conn->sessions_ht,
1043 be64toh(request.session_id));
2f8f53af 1044 if (!session) {
d3e2ba59
JD
1045 DBG("Relay session %" PRIu64 " not found",
1046 be64toh(request.session_id));
c4e361a4 1047 response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK);
d3e2ba59
JD
1048 goto send_reply;
1049 }
2a174661
DG
1050 session_viewer_attach(session);
1051 DBG("Attach session ID %" PRIu64 " received", be64toh(request.session_id));
d3e2ba59 1052
2a174661 1053 if (uatomic_read(&session->viewer_refcount) > 1) {
d3e2ba59 1054 DBG("Already a viewer attached");
c4e361a4 1055 response.status = htobe32(LTTNG_VIEWER_ATTACH_ALREADY);
2a174661 1056 session_viewer_detach(session);
d3e2ba59
JD
1057 goto send_reply;
1058 } else if (session->live_timer == 0) {
1059 DBG("Not live session");
c4e361a4 1060 response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE);
d3e2ba59
JD
1061 goto send_reply;
1062 } else {
d3e2ba59 1063 send_streams = 1;
c4e361a4 1064 response.status = htobe32(LTTNG_VIEWER_ATTACH_OK);
6763619c
JD
1065 cds_list_add(&session->viewer_session_list,
1066 &conn->viewer_session->sessions_head);
d3e2ba59
JD
1067 }
1068
1069 switch (be32toh(request.seek)) {
c4e361a4
JD
1070 case LTTNG_VIEWER_SEEK_BEGINNING:
1071 case LTTNG_VIEWER_SEEK_LAST:
2f8f53af 1072 seek_type = be32toh(request.seek);
d3e2ba59
JD
1073 break;
1074 default:
1075 ERR("Wrong seek parameter");
c4e361a4 1076 response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR);
d3e2ba59
JD
1077 send_streams = 0;
1078 goto send_reply;
1079 }
1080
2f8f53af
DG
1081 ret = make_viewer_streams(session, seek_type, &nb_streams, NULL, NULL);
1082 if (ret < 0) {
1083 goto end_unlock;
d3e2ba59 1084 }
2f8f53af 1085 response.streams_count = htobe32(nb_streams);
d3e2ba59
JD
1086
1087send_reply:
eea7556c 1088 health_code_update();
58eb9381 1089 ret = send_response(conn->sock, &response, sizeof(response));
d3e2ba59 1090 if (ret < 0) {
d3e2ba59
JD
1091 goto end_unlock;
1092 }
eea7556c 1093 health_code_update();
d3e2ba59
JD
1094
1095 /*
157df586 1096 * Unknown or empty session, just return gracefully, the viewer knows what
d3e2ba59
JD
1097 * is happening.
1098 */
157df586 1099 if (!send_streams || !nb_streams) {
d3e2ba59
JD
1100 ret = 0;
1101 goto end_unlock;
1102 }
1103
2f8f53af 1104 /* Send stream and ignore the sent flag. */
58eb9381 1105 ret = send_viewer_streams(conn->sock, session, 1);
2f8f53af
DG
1106 if (ret < 0) {
1107 goto end_unlock;
d3e2ba59 1108 }
d3e2ba59
JD
1109
1110end_unlock:
1111 rcu_read_unlock();
4a9daf17
JD
1112error:
1113 return ret;
1114}
1115
d3e2ba59
JD
1116/*
1117 * Send the next index for a stream.
1118 *
1119 * Return 0 on success or else a negative value.
1120 */
1121static
58eb9381 1122int viewer_get_next_index(struct relay_connection *conn)
d3e2ba59
JD
1123{
1124 int ret;
1125 struct lttng_viewer_get_next_index request_index;
1126 struct lttng_viewer_index viewer_index;
50adc264 1127 struct ctf_packet_index packet_index;
d3e2ba59
JD
1128 struct relay_viewer_stream *vstream;
1129 struct relay_stream *rstream;
2a174661
DG
1130 struct ctf_trace *ctf_trace;
1131 struct relay_session *session;
d3e2ba59 1132
58eb9381 1133 assert(conn);
d3e2ba59
JD
1134
1135 DBG("Viewer get next index");
1136
eea7556c 1137 health_code_update();
2f8f53af 1138
58eb9381 1139 ret = recv_request(conn->sock, &request_index, sizeof(request_index));
2f8f53af 1140 if (ret < 0) {
d3e2ba59
JD
1141 goto end;
1142 }
eea7556c 1143 health_code_update();
d3e2ba59
JD
1144
1145 rcu_read_lock();
6763619c
JD
1146 vstream = viewer_stream_find_by_id(be64toh(request_index.stream_id));
1147 if (!vstream) {
2a174661
DG
1148 ret = -1;
1149 goto end_unlock;
1150 }
1151
6763619c
JD
1152 session = session_find_by_id(conn->sessions_ht, vstream->session_id);
1153 if (!session) {
d3e2ba59
JD
1154 ret = -1;
1155 goto end_unlock;
1156 }
1157
2a174661
DG
1158 ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht, vstream->path_name);
1159 assert(ctf_trace);
1160
d3e2ba59
JD
1161 memset(&viewer_index, 0, sizeof(viewer_index));
1162
1163 /*
1164 * The viewer should not ask for index on metadata stream.
1165 */
1166 if (vstream->metadata_flag) {
c4e361a4 1167 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP);
d3e2ba59
JD
1168 goto send_reply;
1169 }
1170
1171 /* First time, we open the index file */
1172 if (vstream->index_read_fd < 0) {
2f8f53af
DG
1173 ret = index_open(vstream->path_name, vstream->channel_name,
1174 vstream->tracefile_count, vstream->tracefile_count_current);
0e6830aa 1175 if (ret == -ENOENT) {
d3e2ba59
JD
1176 /*
1177 * The index is created only when the first data packet arrives, it
1178 * might not be ready at the beginning of the session
1179 */
c4e361a4 1180 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
d3e2ba59
JD
1181 goto send_reply;
1182 } else if (ret < 0) {
c4e361a4 1183 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
d3e2ba59
JD
1184 goto send_reply;
1185 }
2f8f53af 1186 vstream->index_read_fd = ret;
d3e2ba59
JD
1187 }
1188
2a174661
DG
1189 rstream = stream_find_by_id(relay_streams_ht, vstream->stream_handle);
1190 assert(rstream);
1191
10b0cd2e 1192 pthread_mutex_lock(&rstream->viewer_stream_rotation_lock);
2a174661 1193 if (!rstream->close_flag) {
6b6b9a5a
JD
1194 if (vstream->abort_flag) {
1195 /* Rotate on abort (overwrite). */
1196 DBG("Viewer rotate because of overwrite");
2f8f53af 1197 ret = viewer_stream_rotate(vstream, rstream);
6b6b9a5a 1198 if (ret < 0) {
10b0cd2e 1199 pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock);
6b6b9a5a 1200 goto end_unlock;
a020f610 1201 } else if (ret == 1) {
c4e361a4 1202 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP);
2f8f53af 1203 viewer_stream_delete(vstream);
2a174661 1204 viewer_stream_destroy(ctf_trace, vstream);
10b0cd2e 1205 pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock);
a020f610 1206 goto send_reply;
6b6b9a5a 1207 }
2a174661 1208 /* ret == 0 means successful so we continue. */
6b6b9a5a 1209 }
2a174661 1210
cef0f7d5
JD
1211 if (rstream->tracefile_count_current == vstream->tracefile_count_current) {
1212 if (rstream->beacon_ts_end != -1ULL &&
1213 vstream->last_sent_index == rstream->total_index_received) {
c4e361a4 1214 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE);
cef0f7d5
JD
1215 viewer_index.timestamp_end = htobe64(rstream->beacon_ts_end);
1216 pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock);
1217 goto send_reply;
cef0f7d5
JD
1218 } else if (rstream->total_index_received <= vstream->last_sent_index
1219 && !vstream->close_write_flag) {
2a174661
DG
1220 /*
1221 * Reader and writer are working in the same tracefile, so we care
1222 * about the number of index received and sent. Otherwise, we read
1223 * up to EOF.
1224 */
cef0f7d5
JD
1225 pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock);
1226 /* No new index to send, retry later. */
c4e361a4 1227 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
cef0f7d5
JD
1228 goto send_reply;
1229 }
d3e2ba59 1230 }
2a174661 1231 } else if (rstream->close_flag && vstream->close_write_flag &&
d3e2ba59 1232 vstream->total_index_received == vstream->last_sent_index) {
6b6b9a5a 1233 /* Last index sent and current tracefile closed in write */
c4e361a4 1234 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP);
2f8f53af 1235 viewer_stream_delete(vstream);
2a174661 1236 viewer_stream_destroy(ctf_trace, vstream);
10b0cd2e 1237 pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock);
d3e2ba59 1238 goto send_reply;
6b6b9a5a
JD
1239 } else {
1240 vstream->close_write_flag = 1;
d3e2ba59 1241 }
10b0cd2e 1242 pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock);
d3e2ba59 1243
2a174661
DG
1244 if (!ctf_trace->metadata_received ||
1245 ctf_trace->metadata_received > ctf_trace->metadata_sent) {
d3e2ba59
JD
1246 viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA;
1247 }
1248
f04a971b 1249 ret = check_new_streams(conn);
4a9daf17
JD
1250 if (ret < 0) {
1251 goto end_unlock;
1252 } else if (ret == 1) {
1253 viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM;
1254 }
1255
cef0f7d5
JD
1256 pthread_mutex_lock(&vstream->overwrite_lock);
1257 if (vstream->abort_flag) {
1258 /*
2a174661 1259 * The file is being overwritten by the writer, we cannot * use it.
cef0f7d5 1260 */
c4e361a4 1261 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
cef0f7d5 1262 pthread_mutex_unlock(&vstream->overwrite_lock);
2f8f53af 1263 ret = viewer_stream_rotate(vstream, rstream);
cef0f7d5
JD
1264 if (ret < 0) {
1265 goto end_unlock;
a020f610 1266 } else if (ret == 1) {
c4e361a4 1267 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP);
2f8f53af 1268 viewer_stream_delete(vstream);
2a174661 1269 viewer_stream_destroy(ctf_trace, vstream);
a020f610 1270 goto send_reply;
cef0f7d5
JD
1271 }
1272 goto send_reply;
1273 }
2f8f53af 1274
6cd525e8
MD
1275 ret = lttng_read(vstream->index_read_fd, &packet_index,
1276 sizeof(packet_index));
cef0f7d5 1277 pthread_mutex_unlock(&vstream->overwrite_lock);
d3e2ba59 1278 if (ret < sizeof(packet_index)) {
10b0cd2e
DG
1279 unsigned int close_write_flag;
1280
1281 pthread_mutex_lock(&rstream->viewer_stream_rotation_lock);
1282 close_write_flag = vstream->close_write_flag;
1283 pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock);
6b6b9a5a
JD
1284 /*
1285 * The tracefile is closed in write, so we read up to EOF.
1286 */
10b0cd2e 1287 if (close_write_flag == 1) {
c4e361a4 1288 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
6b6b9a5a 1289 /* Rotate on normal EOF */
2f8f53af 1290 ret = viewer_stream_rotate(vstream, rstream);
6b6b9a5a
JD
1291 if (ret < 0) {
1292 goto end_unlock;
a020f610 1293 } else if (ret == 1) {
c4e361a4 1294 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP);
2f8f53af 1295 viewer_stream_delete(vstream);
2a174661 1296 viewer_stream_destroy(ctf_trace, vstream);
a020f610 1297 goto send_reply;
6b6b9a5a
JD
1298 }
1299 } else {
2f8f53af 1300 PERROR("Relay reading index file %d", vstream->index_read_fd);
c4e361a4 1301 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
6b6b9a5a
JD
1302 }
1303 goto send_reply;
d3e2ba59 1304 } else {
c4e361a4 1305 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK);
d3e2ba59
JD
1306 vstream->last_sent_index++;
1307 }
1308
1309 /*
1310 * Indexes are stored in big endian, no need to switch before sending.
1311 */
1312 viewer_index.offset = packet_index.offset;
1313 viewer_index.packet_size = packet_index.packet_size;
1314 viewer_index.content_size = packet_index.content_size;
1315 viewer_index.timestamp_begin = packet_index.timestamp_begin;
1316 viewer_index.timestamp_end = packet_index.timestamp_end;
1317 viewer_index.events_discarded = packet_index.events_discarded;
1318 viewer_index.stream_id = packet_index.stream_id;
1319
1320send_reply:
1321 viewer_index.flags = htobe32(viewer_index.flags);
eea7556c 1322 health_code_update();
2f8f53af 1323
58eb9381 1324 ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index));
d3e2ba59 1325 if (ret < 0) {
d3e2ba59
JD
1326 goto end_unlock;
1327 }
eea7556c 1328 health_code_update();
d3e2ba59 1329
2f8f53af 1330 DBG("Index %" PRIu64 " for stream %" PRIu64 " sent",
d3e2ba59
JD
1331 vstream->last_sent_index, vstream->stream_handle);
1332
1333end_unlock:
1334 rcu_read_unlock();
1335
d3e2ba59
JD
1336end:
1337 return ret;
1338}
1339
1340/*
1341 * Send the next index for a stream
1342 *
1343 * Return 0 on success or else a negative value.
1344 */
1345static
58eb9381 1346int viewer_get_packet(struct relay_connection *conn)
d3e2ba59
JD
1347{
1348 int ret, send_data = 0;
1349 char *data = NULL;
1350 uint32_t len = 0;
1351 ssize_t read_len;
1352 struct lttng_viewer_get_packet get_packet_info;
1353 struct lttng_viewer_trace_packet reply;
1354 struct relay_viewer_stream *stream;
6763619c 1355 struct relay_session *session;
2a174661 1356 struct ctf_trace *ctf_trace;
d3e2ba59 1357
58eb9381 1358 assert(conn);
d3e2ba59
JD
1359
1360 DBG2("Relay get data packet");
1361
eea7556c 1362 health_code_update();
2f8f53af 1363
58eb9381 1364 ret = recv_request(conn->sock, &get_packet_info, sizeof(get_packet_info));
2f8f53af 1365 if (ret < 0) {
d3e2ba59
JD
1366 goto end;
1367 }
eea7556c 1368 health_code_update();
d3e2ba59 1369
0233a6a5
DG
1370 /* From this point on, the error label can be reached. */
1371 memset(&reply, 0, sizeof(reply));
1372
d3e2ba59 1373 rcu_read_lock();
2f8f53af 1374 stream = viewer_stream_find_by_id(be64toh(get_packet_info.stream_id));
d3e2ba59
JD
1375 if (!stream) {
1376 goto error;
1377 }
2a174661 1378
6763619c
JD
1379 session = session_find_by_id(conn->sessions_ht, stream->session_id);
1380 if (!session) {
1381 ret = -1;
1382 goto error;
1383 }
1384
1385 ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht,
2a174661
DG
1386 stream->path_name);
1387 assert(ctf_trace);
d3e2ba59
JD
1388
1389 /*
1390 * First time we read this stream, we need open the tracefile, we should
1391 * only arrive here if an index has already been sent to the viewer, so the
1392 * tracefile must exist, if it does not it is a fatal error.
1393 */
1394 if (stream->read_fd < 0) {
1395 char fullpath[PATH_MAX];
1396
6b6b9a5a
JD
1397 if (stream->tracefile_count > 0) {
1398 ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64, stream->path_name,
1399 stream->channel_name,
1400 stream->tracefile_count_current);
1401 } else {
1402 ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name,
1403 stream->channel_name);
1404 }
d3e2ba59
JD
1405 if (ret < 0) {
1406 goto error;
1407 }
1408 ret = open(fullpath, O_RDONLY);
1409 if (ret < 0) {
1410 PERROR("Relay opening trace file");
1411 goto error;
1412 }
1413 stream->read_fd = ret;
1414 }
1415
2a174661
DG
1416 if (!ctf_trace->metadata_received ||
1417 ctf_trace->metadata_received > ctf_trace->metadata_sent) {
c4e361a4 1418 reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
d3e2ba59 1419 reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA;
d3e2ba59
JD
1420 goto send_reply;
1421 }
1422
f04a971b 1423 ret = check_new_streams(conn);
4a9daf17
JD
1424 if (ret < 0) {
1425 goto end_unlock;
1426 } else if (ret == 1) {
c4e361a4 1427 reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
4a9daf17
JD
1428 reply.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM;
1429 goto send_reply;
1430 }
1431
d3e2ba59
JD
1432 len = be32toh(get_packet_info.len);
1433 data = zmalloc(len);
1434 if (!data) {
1435 PERROR("relay data zmalloc");
1436 goto error;
1437 }
1438
1439 ret = lseek(stream->read_fd, be64toh(get_packet_info.offset), SEEK_SET);
1440 if (ret < 0) {
6b6b9a5a
JD
1441 /*
1442 * If the read fd was closed by the streaming side, the
1443 * abort_flag will be set to 1, otherwise it is an error.
1444 */
1445 if (stream->abort_flag == 0) {
1446 PERROR("lseek");
1447 goto error;
1448 }
c4e361a4 1449 reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_EOF);
6b6b9a5a 1450 goto send_reply;
d3e2ba59 1451 }
6cd525e8
MD
1452 read_len = lttng_read(stream->read_fd, data, len);
1453 if (read_len < len) {
6b6b9a5a
JD
1454 /*
1455 * If the read fd was closed by the streaming side, the
1456 * abort_flag will be set to 1, otherwise it is an error.
1457 */
1458 if (stream->abort_flag == 0) {
1459 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64,
1460 stream->read_fd,
1461 be64toh(get_packet_info.offset));
1462 goto error;
1463 } else {
c4e361a4 1464 reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_EOF);
6b6b9a5a
JD
1465 goto send_reply;
1466 }
d3e2ba59 1467 }
c4e361a4 1468 reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK);
d3e2ba59
JD
1469 reply.len = htobe32(len);
1470 send_data = 1;
1471 goto send_reply;
1472
1473error:
c4e361a4 1474 reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
d3e2ba59
JD
1475
1476send_reply:
1477 reply.flags = htobe32(reply.flags);
eea7556c
MD
1478
1479 health_code_update();
2f8f53af 1480
58eb9381 1481 ret = send_response(conn->sock, &reply, sizeof(reply));
d3e2ba59 1482 if (ret < 0) {
d3e2ba59
JD
1483 goto end_unlock;
1484 }
eea7556c 1485 health_code_update();
d3e2ba59
JD
1486
1487 if (send_data) {
eea7556c 1488 health_code_update();
58eb9381 1489 ret = send_response(conn->sock, data, len);
d3e2ba59 1490 if (ret < 0) {
d3e2ba59
JD
1491 goto end_unlock;
1492 }
eea7556c 1493 health_code_update();
d3e2ba59
JD
1494 }
1495
1496 DBG("Sent %u bytes for stream %" PRIu64, len,
1497 be64toh(get_packet_info.stream_id));
1498
1499end_unlock:
1500 free(data);
1501 rcu_read_unlock();
1502
1503end:
1504 return ret;
1505}
1506
1507/*
1508 * Send the session's metadata
1509 *
1510 * Return 0 on success else a negative value.
1511 */
1512static
58eb9381 1513int viewer_get_metadata(struct relay_connection *conn)
d3e2ba59
JD
1514{
1515 int ret = 0;
1516 ssize_t read_len;
1517 uint64_t len = 0;
1518 char *data = NULL;
1519 struct lttng_viewer_get_metadata request;
1520 struct lttng_viewer_metadata_packet reply;
1521 struct relay_viewer_stream *stream;
2a174661 1522 struct ctf_trace *ctf_trace;
6763619c 1523 struct relay_session *session;
d3e2ba59 1524
58eb9381 1525 assert(conn);
d3e2ba59
JD
1526
1527 DBG("Relay get metadata");
1528
eea7556c 1529 health_code_update();
2f8f53af 1530
58eb9381 1531 ret = recv_request(conn->sock, &request, sizeof(request));
2f8f53af 1532 if (ret < 0) {
d3e2ba59
JD
1533 goto end;
1534 }
eea7556c 1535 health_code_update();
d3e2ba59
JD
1536
1537 rcu_read_lock();
2f8f53af 1538 stream = viewer_stream_find_by_id(be64toh(request.stream_id));
d3e2ba59
JD
1539 if (!stream || !stream->metadata_flag) {
1540 ERR("Invalid metadata stream");
1541 goto error;
1542 }
d3e2ba59 1543
6763619c
JD
1544 session = session_find_by_id(conn->sessions_ht, stream->session_id);
1545 if (!session) {
1546 ret = -1;
1547 goto error;
1548 }
1549
1550 ctf_trace = ctf_trace_find_by_path(session->ctf_traces_ht,
2a174661
DG
1551 stream->path_name);
1552 assert(ctf_trace);
1553 assert(ctf_trace->metadata_sent <= ctf_trace->metadata_received);
1554
1555 len = ctf_trace->metadata_received - ctf_trace->metadata_sent;
d3e2ba59 1556 if (len == 0) {
c4e361a4 1557 reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA);
d3e2ba59
JD
1558 goto send_reply;
1559 }
1560
1561 /* first time, we open the metadata file */
1562 if (stream->read_fd < 0) {
1563 char fullpath[PATH_MAX];
1564
1565 ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name,
1566 stream->channel_name);
1567 if (ret < 0) {
1568 goto error;
1569 }
1570 ret = open(fullpath, O_RDONLY);
1571 if (ret < 0) {
1572 PERROR("Relay opening metadata file");
1573 goto error;
1574 }
1575 stream->read_fd = ret;
1576 }
1577
1578 reply.len = htobe64(len);
1579 data = zmalloc(len);
1580 if (!data) {
1581 PERROR("viewer metadata zmalloc");
1582 goto error;
1583 }
1584
6cd525e8
MD
1585 read_len = lttng_read(stream->read_fd, data, len);
1586 if (read_len < len) {
d3e2ba59
JD
1587 PERROR("Relay reading metadata file");
1588 goto error;
1589 }
2a174661 1590 ctf_trace->metadata_sent += read_len;
c4e361a4 1591 reply.status = htobe32(LTTNG_VIEWER_METADATA_OK);
d3e2ba59
JD
1592 goto send_reply;
1593
1594error:
c4e361a4 1595 reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR);
d3e2ba59
JD
1596
1597send_reply:
eea7556c 1598 health_code_update();
58eb9381 1599 ret = send_response(conn->sock, &reply, sizeof(reply));
d3e2ba59 1600 if (ret < 0) {
d3e2ba59
JD
1601 goto end_unlock;
1602 }
eea7556c 1603 health_code_update();
d3e2ba59
JD
1604
1605 if (len > 0) {
58eb9381 1606 ret = send_response(conn->sock, data, len);
d3e2ba59 1607 if (ret < 0) {
d3e2ba59
JD
1608 goto end_unlock;
1609 }
1610 }
1611
1612 DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len,
1613 be64toh(request.stream_id));
1614
1615 DBG("Metadata sent");
1616
1617end_unlock:
1618 free(data);
1619 rcu_read_unlock();
1620end:
1621 return ret;
1622}
1623
c3b7390b
JD
1624/*
1625 * Create a viewer session.
1626 *
1627 * Return 0 on success or else a negative value.
1628 */
1629static
1630int viewer_create_session(struct relay_connection *conn)
1631{
1632 int ret;
1633 struct lttng_viewer_create_session_response resp;
1634
1635 DBG("Viewer create session received");
1636
1637 resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK);
32816a93 1638 conn->viewer_session = zmalloc(sizeof(*conn->viewer_session));
c3b7390b
JD
1639 if (!conn->viewer_session) {
1640 ERR("Allocation viewer session");
1641 resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR);
1642 goto send_reply;
1643 }
1644 CDS_INIT_LIST_HEAD(&conn->viewer_session->sessions_head);
1645
1646send_reply:
1647 health_code_update();
1648 ret = send_response(conn->sock, &resp, sizeof(resp));
1649 if (ret < 0) {
1650 goto end;
1651 }
1652 health_code_update();
1653 ret = 0;
1654
1655end:
1656 return ret;
1657}
1658
1659
d3e2ba59
JD
1660/*
1661 * live_relay_unknown_command: send -1 if received unknown command
1662 */
1663static
58eb9381 1664void live_relay_unknown_command(struct relay_connection *conn)
d3e2ba59
JD
1665{
1666 struct lttcomm_relayd_generic_reply reply;
d3e2ba59
JD
1667
1668 reply.ret_code = htobe32(LTTNG_ERR_UNK);
58eb9381 1669 (void) send_response(conn->sock, &reply, sizeof(reply));
d3e2ba59
JD
1670}
1671
1672/*
1673 * Process the commands received on the control socket
1674 */
1675static
1676int process_control(struct lttng_viewer_cmd *recv_hdr,
58eb9381 1677 struct relay_connection *conn)
d3e2ba59
JD
1678{
1679 int ret = 0;
2f8f53af
DG
1680 uint32_t msg_value;
1681
1682 assert(recv_hdr);
58eb9381 1683 assert(conn);
2f8f53af
DG
1684
1685 msg_value = be32toh(recv_hdr->cmd);
1686
1687 /*
1688 * Make sure we've done the version check before any command other then a
1689 * new client connection.
1690 */
c4e361a4 1691 if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) {
58eb9381 1692 ERR("Viewer conn value %" PRIu32 " before version check", msg_value);
2f8f53af
DG
1693 ret = -1;
1694 goto end;
1695 }
d3e2ba59 1696
2f8f53af 1697 switch (msg_value) {
c4e361a4 1698 case LTTNG_VIEWER_CONNECT:
58eb9381 1699 ret = viewer_connect(conn);
d3e2ba59 1700 break;
c4e361a4 1701 case LTTNG_VIEWER_LIST_SESSIONS:
58eb9381 1702 ret = viewer_list_sessions(conn);
d3e2ba59 1703 break;
c4e361a4 1704 case LTTNG_VIEWER_ATTACH_SESSION:
58eb9381 1705 ret = viewer_attach_session(conn);
d3e2ba59 1706 break;
c4e361a4 1707 case LTTNG_VIEWER_GET_NEXT_INDEX:
58eb9381 1708 ret = viewer_get_next_index(conn);
d3e2ba59 1709 break;
c4e361a4 1710 case LTTNG_VIEWER_GET_PACKET:
58eb9381 1711 ret = viewer_get_packet(conn);
d3e2ba59 1712 break;
c4e361a4 1713 case LTTNG_VIEWER_GET_METADATA:
58eb9381 1714 ret = viewer_get_metadata(conn);
d3e2ba59 1715 break;
c4e361a4 1716 case LTTNG_VIEWER_GET_NEW_STREAMS:
58eb9381 1717 ret = viewer_get_new_streams(conn);
80e8027a 1718 break;
c3b7390b
JD
1719 case LTTNG_VIEWER_CREATE_SESSION:
1720 ret = viewer_create_session(conn);
1721 break;
d3e2ba59
JD
1722 default:
1723 ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd));
58eb9381 1724 live_relay_unknown_command(conn);
d3e2ba59
JD
1725 ret = -1;
1726 goto end;
1727 }
1728
1729end:
1730 return ret;
1731}
1732
1733static
58eb9381 1734void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd)
d3e2ba59
JD
1735{
1736 int ret;
1737
1738 assert(events);
1739
58eb9381 1740 (void) lttng_poll_del(events, pollfd);
d3e2ba59
JD
1741
1742 ret = close(pollfd);
1743 if (ret < 0) {
1744 ERR("Closing pollfd %d", pollfd);
1745 }
1746}
1747
d3e2ba59 1748/*
58eb9381 1749 * Delete and destroy a connection.
d3e2ba59
JD
1750 *
1751 * RCU read side lock MUST be acquired.
1752 */
58eb9381
DG
1753static void destroy_connection(struct lttng_ht *relay_connections_ht,
1754 struct relay_connection *conn)
d3e2ba59 1755{
6763619c 1756 struct relay_session *session, *tmp_session;
d3e2ba59
JD
1757
1758 assert(relay_connections_ht);
58eb9381 1759 assert(conn);
d3e2ba59 1760
58eb9381 1761 connection_delete(relay_connections_ht, conn);
d3e2ba59 1762
6763619c
JD
1763 if (!conn->viewer_session) {
1764 goto end;
1765 }
1766
58eb9381 1767 rcu_read_lock();
6763619c
JD
1768 cds_list_for_each_entry_safe(session, tmp_session,
1769 &conn->viewer_session->sessions_head,
1770 viewer_session_list) {
1771 DBG("Cleaning connection of session ID %" PRIu64, session->id);
d227d5bd 1772 cleanup_session(conn, session);
2a174661
DG
1773 }
1774 rcu_read_unlock();
d3e2ba59 1775
6763619c 1776end:
58eb9381 1777 connection_destroy(conn);
d3e2ba59
JD
1778}
1779
1780/*
1781 * This thread does the actual work
1782 */
1783static
1784void *thread_worker(void *data)
1785{
1786 int ret, err = -1;
1787 uint32_t nb_fd;
58eb9381 1788 struct relay_connection *conn;
d3e2ba59
JD
1789 struct lttng_poll_event events;
1790 struct lttng_ht *relay_connections_ht;
d3e2ba59
JD
1791 struct lttng_ht_iter iter;
1792 struct lttng_viewer_cmd recv_hdr;
1793 struct relay_local_data *relay_ctx = (struct relay_local_data *) data;
1794 struct lttng_ht *sessions_ht = relay_ctx->sessions_ht;
d3e2ba59
JD
1795
1796 DBG("[thread] Live viewer relay worker started");
1797
1798 rcu_register_thread();
1799
eea7556c
MD
1800 health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER);
1801
9b5e0863
MD
1802 if (testpoint(relayd_thread_live_worker)) {
1803 goto error_testpoint;
1804 }
1805
d3e2ba59
JD
1806 /* table of connections indexed on socket */
1807 relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1808 if (!relay_connections_ht) {
1809 goto relay_connections_ht_error;
1810 }
1811
1812 ret = create_thread_poll_set(&events, 2);
1813 if (ret < 0) {
1814 goto error_poll_create;
1815 }
1816
58eb9381 1817 ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP);
d3e2ba59
JD
1818 if (ret < 0) {
1819 goto error;
1820 }
1821
1822restart:
1823 while (1) {
1824 int i;
1825
eea7556c
MD
1826 health_code_update();
1827
d3e2ba59
JD
1828 /* Infinite blocking call, waiting for transmission */
1829 DBG3("Relayd live viewer worker thread polling...");
eea7556c 1830 health_poll_entry();
d3e2ba59 1831 ret = lttng_poll_wait(&events, -1);
eea7556c 1832 health_poll_exit();
d3e2ba59
JD
1833 if (ret < 0) {
1834 /*
1835 * Restart interrupted system call.
1836 */
1837 if (errno == EINTR) {
1838 goto restart;
1839 }
1840 goto error;
1841 }
1842
1843 nb_fd = ret;
1844
1845 /*
1846 * Process control. The control connection is prioritised so we don't
1847 * starve it with high throughput tracing data on the data
1848 * connection.
1849 */
1850 for (i = 0; i < nb_fd; i++) {
1851 /* Fetch once the poll data */
1852 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
1853 int pollfd = LTTNG_POLL_GETFD(&events, i);
1854
eea7556c
MD
1855 health_code_update();
1856
d3e2ba59 1857 /* Thread quit pipe has been closed. Killing thread. */
bcf4a440 1858 ret = check_thread_quit_pipe(pollfd, revents);
d3e2ba59
JD
1859 if (ret) {
1860 err = 0;
1861 goto exit;
1862 }
1863
58eb9381
DG
1864 /* Inspect the relay conn pipe for new connection */
1865 if (pollfd == live_conn_pipe[0]) {
d3e2ba59
JD
1866 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1867 ERR("Relay live pipe error");
1868 goto error;
1869 } else if (revents & LPOLLIN) {
58eb9381 1870 ret = lttng_read(live_conn_pipe[0], &conn, sizeof(conn));
d3e2ba59
JD
1871 if (ret < 0) {
1872 goto error;
1873 }
58eb9381
DG
1874 conn->sessions_ht = sessions_ht;
1875 connection_init(conn);
1876 lttng_poll_add(&events, conn->sock->fd,
1877 LPOLLIN | LPOLLRDHUP);
1878 rcu_read_lock();
1879 lttng_ht_add_unique_ulong(relay_connections_ht,
1880 &conn->sock_n);
d3e2ba59 1881 rcu_read_unlock();
58eb9381 1882 DBG("Connection socket %d added", conn->sock->fd);
d3e2ba59 1883 }
58eb9381
DG
1884 } else {
1885 rcu_read_lock();
1886 conn = connection_find_by_sock(relay_connections_ht, pollfd);
1887 /* If not found, there is a synchronization issue. */
1888 assert(conn);
1889
1890 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1891 cleanup_connection_pollfd(&events, pollfd);
1892 destroy_connection(relay_connections_ht, conn);
d3e2ba59 1893 } else if (revents & LPOLLIN) {
58eb9381
DG
1894 ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr,
1895 sizeof(recv_hdr), 0);
d3e2ba59 1896 if (ret <= 0) {
58eb9381
DG
1897 /* Connection closed */
1898 cleanup_connection_pollfd(&events, pollfd);
1899 destroy_connection(relay_connections_ht, conn);
1900 DBG("Viewer control conn closed with %d", pollfd);
d3e2ba59 1901 } else {
58eb9381 1902 ret = process_control(&recv_hdr, conn);
d3e2ba59
JD
1903 if (ret < 0) {
1904 /* Clear the session on error. */
58eb9381
DG
1905 cleanup_connection_pollfd(&events, pollfd);
1906 destroy_connection(relay_connections_ht, conn);
d3e2ba59
JD
1907 DBG("Viewer connection closed with %d", pollfd);
1908 }
1909 }
1910 }
1911 rcu_read_unlock();
1912 }
1913 }
1914 }
1915
1916exit:
1917error:
1918 lttng_poll_clean(&events);
1919
58eb9381 1920 /* Cleanup reamaining connection object. */
d3e2ba59 1921 rcu_read_lock();
58eb9381
DG
1922 cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, conn,
1923 sock_n.node) {
eea7556c 1924 health_code_update();
58eb9381 1925 destroy_connection(relay_connections_ht, conn);
d3e2ba59
JD
1926 }
1927 rcu_read_unlock();
1928error_poll_create:
1929 lttng_ht_destroy(relay_connections_ht);
1930relay_connections_ht_error:
58eb9381
DG
1931 /* Close relay conn pipes */
1932 utils_close_pipe(live_conn_pipe);
d3e2ba59
JD
1933 if (err) {
1934 DBG("Viewer worker thread exited with error");
1935 }
1936 DBG("Viewer worker thread cleanup complete");
9b5e0863 1937error_testpoint:
eea7556c
MD
1938 if (err) {
1939 health_error();
1940 ERR("Health error occurred in %s", __func__);
1941 }
1942 health_unregister(health_relayd);
d3e2ba59
JD
1943 stop_threads();
1944 rcu_unregister_thread();
1945 return NULL;
1946}
1947
1948/*
1949 * Create the relay command pipe to wake thread_manage_apps.
1950 * Closed in cleanup().
1951 */
58eb9381 1952static int create_conn_pipe(void)
d3e2ba59
JD
1953{
1954 int ret;
1955
58eb9381 1956 ret = utils_create_pipe_cloexec(live_conn_pipe);
d3e2ba59
JD
1957
1958 return ret;
1959}
1960
aaec7998 1961void live_stop_threads(void)
d3e2ba59
JD
1962{
1963 int ret;
1964 void *status;
1965
1966 stop_threads();
1967
1968 ret = pthread_join(live_listener_thread, &status);
1969 if (ret != 0) {
1970 PERROR("pthread_join live listener");
1971 goto error; /* join error, exit without cleanup */
1972 }
1973
1974 ret = pthread_join(live_worker_thread, &status);
1975 if (ret != 0) {
1976 PERROR("pthread_join live worker");
1977 goto error; /* join error, exit without cleanup */
1978 }
1979
1980 ret = pthread_join(live_dispatcher_thread, &status);
1981 if (ret != 0) {
1982 PERROR("pthread_join live dispatcher");
1983 goto error; /* join error, exit without cleanup */
1984 }
1985
1986 cleanup();
1987
1988error:
1989 return;
1990}
1991
1992/*
1993 * main
1994 */
1995int live_start_threads(struct lttng_uri *uri,
0b242f62 1996 struct relay_local_data *relay_ctx)
d3e2ba59
JD
1997{
1998 int ret = 0;
1999 void *status;
2000 int is_root;
2001
2002 assert(uri);
2003 live_uri = uri;
2004
d3e2ba59
JD
2005 /* Check if daemon is UID = 0 */
2006 is_root = !getuid();
2007
2008 if (!is_root) {
2009 if (live_uri->port < 1024) {
2010 ERR("Need to be root to use ports < 1024");
2011 ret = -1;
2012 goto exit;
2013 }
2014 }
2015
2016 /* Setup the thread apps communication pipe. */
58eb9381 2017 if ((ret = create_conn_pipe()) < 0) {
d3e2ba59
JD
2018 goto exit;
2019 }
2020
2021 /* Init relay command queue. */
58eb9381 2022 cds_wfq_init(&viewer_conn_queue.queue);
d3e2ba59
JD
2023
2024 /* Set up max poll set size */
2025 lttng_poll_set_max_size();
2026
2027 /* Setup the dispatcher thread */
2028 ret = pthread_create(&live_dispatcher_thread, NULL,
2029 thread_dispatcher, (void *) NULL);
2030 if (ret != 0) {
2031 PERROR("pthread_create viewer dispatcher");
2032 goto exit_dispatcher;
2033 }
2034
2035 /* Setup the worker thread */
2036 ret = pthread_create(&live_worker_thread, NULL,
2037 thread_worker, relay_ctx);
2038 if (ret != 0) {
2039 PERROR("pthread_create viewer worker");
2040 goto exit_worker;
2041 }
2042
2043 /* Setup the listener thread */
2044 ret = pthread_create(&live_listener_thread, NULL,
2045 thread_listener, (void *) NULL);
2046 if (ret != 0) {
2047 PERROR("pthread_create viewer listener");
2048 goto exit_listener;
2049 }
2050
2051 ret = 0;
2052 goto end;
2053
2054exit_listener:
2055 ret = pthread_join(live_listener_thread, &status);
2056 if (ret != 0) {
2057 PERROR("pthread_join live listener");
2058 goto error; /* join error, exit without cleanup */
2059 }
2060
2061exit_worker:
2062 ret = pthread_join(live_worker_thread, &status);
2063 if (ret != 0) {
2064 PERROR("pthread_join live worker");
2065 goto error; /* join error, exit without cleanup */
2066 }
2067
2068exit_dispatcher:
2069 ret = pthread_join(live_dispatcher_thread, &status);
2070 if (ret != 0) {
2071 PERROR("pthread_join live dispatcher");
2072 goto error; /* join error, exit without cleanup */
2073 }
2074
2075exit:
2076 cleanup();
2077
2078end:
2079error:
2080 return ret;
2081}
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