Commit | Line | Data |
---|---|---|
d3e2ba59 JD |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
9a78c92e | 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 | |
21 | #include <getopt.h> | |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
25 | #include <signal.h> | |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <sys/mman.h> | |
30 | #include <sys/mount.h> | |
31 | #include <sys/resource.h> | |
32 | #include <sys/socket.h> | |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
35 | #include <sys/wait.h> | |
36 | #include <inttypes.h> | |
37 | #include <urcu/futex.h> | |
38 | #include <urcu/uatomic.h> | |
9a78c92e | 39 | #include <urcu/rculist.h> |
d3e2ba59 JD |
40 | #include <unistd.h> |
41 | #include <fcntl.h> | |
42 | #include <config.h> | |
43 | ||
44 | #include <lttng/lttng.h> | |
45 | #include <common/common.h> | |
46 | #include <common/compat/poll.h> | |
47 | #include <common/compat/socket.h> | |
f263b7fd | 48 | #include <common/compat/endian.h> |
d3e2ba59 JD |
49 | #include <common/defaults.h> |
50 | #include <common/futex.h> | |
2f8f53af | 51 | #include <common/index/index.h> |
d3e2ba59 JD |
52 | #include <common/sessiond-comm/sessiond-comm.h> |
53 | #include <common/sessiond-comm/inet.h> | |
54 | #include <common/sessiond-comm/relayd.h> | |
55 | #include <common/uri.h> | |
56 | #include <common/utils.h> | |
57 | ||
58 | #include "cmd.h" | |
59 | #include "live.h" | |
60 | #include "lttng-relayd.h" | |
d3e2ba59 | 61 | #include "utils.h" |
eea7556c | 62 | #include "health-relayd.h" |
9b5e0863 | 63 | #include "testpoint.h" |
2f8f53af | 64 | #include "viewer-stream.h" |
2a174661 DG |
65 | #include "stream.h" |
66 | #include "session.h" | |
67 | #include "ctf-trace.h" | |
58eb9381 | 68 | #include "connection.h" |
9a78c92e MD |
69 | #include "viewer-session.h" |
70 | ||
71 | #define SESSION_BUF_DEFAULT_COUNT 16 | |
d3e2ba59 JD |
72 | |
73 | static struct lttng_uri *live_uri; | |
74 | ||
d3e2ba59 JD |
75 | /* |
76 | * This pipe is used to inform the worker thread that a command is queued and | |
77 | * ready to be processed. | |
78 | */ | |
58eb9381 | 79 | static int live_conn_pipe[2] = { -1, -1 }; |
d3e2ba59 JD |
80 | |
81 | /* Shared between threads */ | |
82 | static int live_dispatch_thread_exit; | |
83 | ||
84 | static pthread_t live_listener_thread; | |
85 | static pthread_t live_dispatcher_thread; | |
86 | static pthread_t live_worker_thread; | |
87 | ||
88 | /* | |
89 | * Relay command queue. | |
90 | * | |
91 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
92 | * queue. | |
93 | */ | |
58eb9381 | 94 | static struct relay_conn_queue viewer_conn_queue; |
d3e2ba59 JD |
95 | |
96 | static uint64_t last_relay_viewer_session_id; | |
9a78c92e MD |
97 | static pthread_mutex_t last_relay_viewer_session_id_lock = |
98 | PTHREAD_MUTEX_INITIALIZER; | |
d3e2ba59 JD |
99 | |
100 | /* | |
101 | * Cleanup the daemon | |
102 | */ | |
103 | static | |
77c54fed | 104 | void cleanup_relayd_live(void) |
d3e2ba59 JD |
105 | { |
106 | DBG("Cleaning up"); | |
107 | ||
d3e2ba59 JD |
108 | free(live_uri); |
109 | } | |
110 | ||
2f8f53af DG |
111 | /* |
112 | * Receive a request buffer using a given socket, destination allocated buffer | |
113 | * of length size. | |
114 | * | |
115 | * Return the size of the received message or else a negative value on error | |
116 | * with errno being set by recvmsg() syscall. | |
117 | */ | |
118 | static | |
119 | ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size) | |
120 | { | |
121 | ssize_t ret; | |
122 | ||
2f8f53af DG |
123 | ret = sock->ops->recvmsg(sock, buf, size, 0); |
124 | if (ret < 0 || ret != size) { | |
125 | if (ret == 0) { | |
126 | /* Orderly shutdown. Not necessary to print an error. */ | |
127 | DBG("Socket %d did an orderly shutdown", sock->fd); | |
128 | } else { | |
129 | ERR("Relay failed to receive request."); | |
130 | } | |
131 | ret = -1; | |
132 | } | |
133 | ||
134 | return ret; | |
135 | } | |
136 | ||
137 | /* | |
138 | * Send a response buffer using a given socket, source allocated buffer of | |
139 | * length size. | |
140 | * | |
141 | * Return the size of the sent message or else a negative value on error with | |
142 | * errno being set by sendmsg() syscall. | |
143 | */ | |
144 | static | |
145 | ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size) | |
146 | { | |
147 | ssize_t ret; | |
148 | ||
2f8f53af DG |
149 | ret = sock->ops->sendmsg(sock, buf, size, 0); |
150 | if (ret < 0) { | |
151 | ERR("Relayd failed to send response."); | |
152 | } | |
153 | ||
154 | return ret; | |
155 | } | |
156 | ||
157 | /* | |
f04a971b JD |
158 | * Atomically check if new streams got added in one of the sessions attached |
159 | * and reset the flag to 0. | |
2f8f53af DG |
160 | * |
161 | * Returns 1 if new streams got added, 0 if nothing changed, a negative value | |
162 | * on error. | |
163 | */ | |
164 | static | |
f04a971b | 165 | int check_new_streams(struct relay_connection *conn) |
2f8f53af | 166 | { |
2f8f53af | 167 | struct relay_session *session; |
f04a971b JD |
168 | unsigned long current_val; |
169 | int ret = 0; | |
2f8f53af | 170 | |
f04a971b JD |
171 | if (!conn->viewer_session) { |
172 | goto end; | |
173 | } | |
9a78c92e MD |
174 | rcu_read_lock(); |
175 | cds_list_for_each_entry_rcu(session, | |
176 | &conn->viewer_session->session_list, | |
177 | viewer_session_node) { | |
178 | if (!session_get(session)) { | |
179 | continue; | |
180 | } | |
f04a971b JD |
181 | current_val = uatomic_cmpxchg(&session->new_streams, 1, 0); |
182 | ret = current_val; | |
9a78c92e | 183 | session_put(session); |
f04a971b JD |
184 | if (ret == 1) { |
185 | goto end; | |
186 | } | |
2f8f53af | 187 | } |
f04a971b | 188 | end: |
9a78c92e | 189 | rcu_read_unlock(); |
2f8f53af DG |
190 | return ret; |
191 | } | |
192 | ||
193 | /* | |
194 | * Send viewer streams to the given socket. The ignore_sent_flag indicates if | |
195 | * this function should ignore the sent flag or not. | |
196 | * | |
197 | * Return 0 on success or else a negative value. | |
198 | */ | |
199 | static | |
200 | ssize_t send_viewer_streams(struct lttcomm_sock *sock, | |
201 | struct relay_session *session, unsigned int ignore_sent_flag) | |
202 | { | |
203 | ssize_t ret; | |
204 | struct lttng_viewer_stream send_stream; | |
205 | struct lttng_ht_iter iter; | |
206 | struct relay_viewer_stream *vstream; | |
207 | ||
2f8f53af DG |
208 | rcu_read_lock(); |
209 | ||
210 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
211 | stream_n.node) { | |
2a174661 DG |
212 | struct ctf_trace *ctf_trace; |
213 | ||
2f8f53af DG |
214 | health_code_update(); |
215 | ||
9a78c92e MD |
216 | if (!viewer_stream_get(vstream)) { |
217 | continue; | |
218 | } | |
219 | ||
220 | pthread_mutex_lock(&vstream->stream->lock); | |
2f8f53af | 221 | /* Ignore if not the same session. */ |
9a78c92e | 222 | if (vstream->stream->trace->session->id != session->id || |
2f8f53af | 223 | (!ignore_sent_flag && vstream->sent_flag)) { |
9a78c92e MD |
224 | pthread_mutex_unlock(&vstream->stream->lock); |
225 | viewer_stream_put(vstream); | |
2f8f53af DG |
226 | continue; |
227 | } | |
228 | ||
9a78c92e MD |
229 | ctf_trace = vstream->stream->trace; |
230 | send_stream.id = htobe64(vstream->stream->stream_handle); | |
2a174661 | 231 | send_stream.ctf_trace_id = htobe64(ctf_trace->id); |
9a78c92e MD |
232 | send_stream.metadata_flag = htobe32( |
233 | vstream->stream->is_metadata); | |
2f8f53af DG |
234 | strncpy(send_stream.path_name, vstream->path_name, |
235 | sizeof(send_stream.path_name)); | |
236 | strncpy(send_stream.channel_name, vstream->channel_name, | |
237 | sizeof(send_stream.channel_name)); | |
238 | ||
9a78c92e MD |
239 | DBG("Sending stream %" PRIu64 " to viewer", |
240 | vstream->stream->stream_handle); | |
241 | vstream->sent_flag = 1; | |
242 | pthread_mutex_unlock(&vstream->stream->lock); | |
243 | ||
2f8f53af | 244 | ret = send_response(sock, &send_stream, sizeof(send_stream)); |
9a78c92e | 245 | viewer_stream_put(vstream); |
2f8f53af DG |
246 | if (ret < 0) { |
247 | goto end_unlock; | |
248 | } | |
2f8f53af DG |
249 | } |
250 | ||
251 | ret = 0; | |
252 | ||
253 | end_unlock: | |
254 | rcu_read_unlock(); | |
255 | return ret; | |
256 | } | |
257 | ||
258 | /* | |
259 | * Create every viewer stream possible for the given session with the seek | |
260 | * type. Three counters *can* be return which are in order the total amount of | |
261 | * viewer stream of the session, the number of unsent stream and the number of | |
262 | * stream created. Those counters can be NULL and thus will be ignored. | |
263 | * | |
264 | * Return 0 on success or else a negative value. | |
265 | */ | |
266 | static | |
267 | int make_viewer_streams(struct relay_session *session, | |
268 | enum lttng_viewer_seek seek_t, uint32_t *nb_total, uint32_t *nb_unsent, | |
11436961 | 269 | uint32_t *nb_created, bool *closed) |
2f8f53af DG |
270 | { |
271 | int ret; | |
2f8f53af | 272 | struct lttng_ht_iter iter; |
2a174661 | 273 | struct ctf_trace *ctf_trace; |
2f8f53af DG |
274 | |
275 | assert(session); | |
276 | ||
277 | /* | |
9a78c92e MD |
278 | * Hold the session lock to ensure that we see either none or |
279 | * all initial streams for a session, but no intermediate state. | |
2f8f53af | 280 | */ |
9a78c92e | 281 | pthread_mutex_lock(&session->lock); |
2f8f53af | 282 | |
11436961 MD |
283 | if (session->connection_closed) { |
284 | *closed = true; | |
285 | } | |
286 | ||
2f8f53af | 287 | /* |
9a78c92e MD |
288 | * Create viewer streams for relay streams that are ready to be |
289 | * used for a the given session id only. | |
2f8f53af | 290 | */ |
2a174661 DG |
291 | rcu_read_lock(); |
292 | cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, | |
293 | node.node) { | |
294 | struct relay_stream *stream; | |
2f8f53af DG |
295 | |
296 | health_code_update(); | |
297 | ||
9a78c92e | 298 | if (!ctf_trace_get(ctf_trace)) { |
2f8f53af DG |
299 | continue; |
300 | } | |
301 | ||
9a78c92e | 302 | cds_list_for_each_entry_rcu(stream, &ctf_trace->stream_list, stream_node) { |
2a174661 DG |
303 | struct relay_viewer_stream *vstream; |
304 | ||
9a78c92e | 305 | if (!stream_get(stream)) { |
2a174661 DG |
306 | continue; |
307 | } | |
9a78c92e MD |
308 | /* |
309 | * stream published is protected by the session | |
310 | * lock. | |
311 | */ | |
312 | if (!stream->published) { | |
313 | goto next; | |
314 | } | |
315 | vstream = viewer_stream_get_by_id(stream->stream_handle); | |
2f8f53af | 316 | if (!vstream) { |
9a78c92e | 317 | vstream = viewer_stream_create(stream, seek_t); |
2a174661 DG |
318 | if (!vstream) { |
319 | ret = -1; | |
9a78c92e MD |
320 | ctf_trace_put(ctf_trace); |
321 | stream_put(stream); | |
2a174661 DG |
322 | goto error_unlock; |
323 | } | |
2a174661 DG |
324 | |
325 | if (nb_created) { | |
326 | /* Update number of created stream counter. */ | |
327 | (*nb_created)++; | |
328 | } | |
64bda0b4 MD |
329 | /* |
330 | * Ensure a self-reference is preserved even | |
331 | * after we have put our local reference. | |
332 | */ | |
333 | viewer_stream_get(vstream); | |
9a78c92e MD |
334 | } else { |
335 | if (!vstream->sent_flag && nb_unsent) { | |
336 | /* Update number of unsent stream counter. */ | |
337 | (*nb_unsent)++; | |
338 | } | |
2f8f53af | 339 | } |
2a174661 DG |
340 | /* Update number of total stream counter. */ |
341 | if (nb_total) { | |
64bda0b4 MD |
342 | if (stream->is_metadata) { |
343 | if (!stream->closed || | |
344 | stream->metadata_received > vstream->metadata_sent) { | |
345 | (*nb_total)++; | |
346 | } | |
347 | } else { | |
348 | if (!stream->closed || | |
349 | !(((int64_t) (stream->prev_seq - stream->last_net_seq_num)) >= 0)) { | |
350 | ||
351 | (*nb_total)++; | |
352 | } | |
353 | } | |
2f8f53af | 354 | } |
64bda0b4 MD |
355 | /* Put local reference. */ |
356 | viewer_stream_put(vstream); | |
9a78c92e MD |
357 | next: |
358 | stream_put(stream); | |
2f8f53af | 359 | } |
9a78c92e | 360 | ctf_trace_put(ctf_trace); |
2f8f53af DG |
361 | } |
362 | ||
363 | ret = 0; | |
364 | ||
365 | error_unlock: | |
2a174661 | 366 | rcu_read_unlock(); |
9a78c92e | 367 | pthread_mutex_unlock(&session->lock); |
2f8f53af DG |
368 | return ret; |
369 | } | |
370 | ||
770f96f4 | 371 | int relayd_live_stop(void) |
d3e2ba59 | 372 | { |
770f96f4 | 373 | /* Stop dispatch thread */ |
d3e2ba59 | 374 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); |
58eb9381 | 375 | futex_nto1_wake(&viewer_conn_queue.futex); |
770f96f4 | 376 | return 0; |
d3e2ba59 JD |
377 | } |
378 | ||
d3e2ba59 JD |
379 | /* |
380 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
381 | */ | |
382 | static | |
383 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
384 | { | |
385 | int ret; | |
386 | ||
387 | if (events == NULL || size == 0) { | |
388 | ret = -1; | |
389 | goto error; | |
390 | } | |
391 | ||
392 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
393 | if (ret < 0) { | |
394 | goto error; | |
395 | } | |
396 | ||
397 | /* Add quit pipe */ | |
bcf4a440 | 398 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
d3e2ba59 JD |
399 | if (ret < 0) { |
400 | goto error; | |
401 | } | |
402 | ||
403 | return 0; | |
404 | ||
405 | error: | |
406 | return ret; | |
407 | } | |
408 | ||
409 | /* | |
410 | * Check if the thread quit pipe was triggered. | |
411 | * | |
412 | * Return 1 if it was triggered else 0; | |
413 | */ | |
414 | static | |
bcf4a440 | 415 | int check_thread_quit_pipe(int fd, uint32_t events) |
d3e2ba59 | 416 | { |
bcf4a440 | 417 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
418 | return 1; |
419 | } | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | /* | |
425 | * Create and init socket from uri. | |
426 | */ | |
427 | static | |
428 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
429 | { | |
430 | int ret; | |
431 | struct lttcomm_sock *sock = NULL; | |
432 | ||
433 | sock = lttcomm_alloc_sock_from_uri(uri); | |
434 | if (sock == NULL) { | |
435 | ERR("Allocating socket"); | |
436 | goto error; | |
437 | } | |
438 | ||
439 | ret = lttcomm_create_sock(sock); | |
440 | if (ret < 0) { | |
441 | goto error; | |
442 | } | |
443 | DBG("Listening on sock %d for live", sock->fd); | |
444 | ||
445 | ret = sock->ops->bind(sock); | |
446 | if (ret < 0) { | |
447 | goto error; | |
448 | } | |
449 | ||
450 | ret = sock->ops->listen(sock, -1); | |
451 | if (ret < 0) { | |
452 | goto error; | |
453 | ||
454 | } | |
455 | ||
456 | return sock; | |
457 | ||
458 | error: | |
459 | if (sock) { | |
460 | lttcomm_destroy_sock(sock); | |
461 | } | |
462 | return NULL; | |
463 | } | |
464 | ||
465 | /* | |
466 | * This thread manages the listening for new connections on the network | |
467 | */ | |
468 | static | |
469 | void *thread_listener(void *data) | |
470 | { | |
471 | int i, ret, pollfd, err = -1; | |
d3e2ba59 JD |
472 | uint32_t revents, nb_fd; |
473 | struct lttng_poll_event events; | |
474 | struct lttcomm_sock *live_control_sock; | |
475 | ||
476 | DBG("[thread] Relay live listener started"); | |
477 | ||
eea7556c MD |
478 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
479 | ||
480 | health_code_update(); | |
481 | ||
d3e2ba59 JD |
482 | live_control_sock = init_socket(live_uri); |
483 | if (!live_control_sock) { | |
484 | goto error_sock_control; | |
485 | } | |
486 | ||
fb4d42ab | 487 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
d3e2ba59 JD |
488 | ret = create_thread_poll_set(&events, 2); |
489 | if (ret < 0) { | |
490 | goto error_create_poll; | |
491 | } | |
492 | ||
493 | /* Add the control socket */ | |
494 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
495 | if (ret < 0) { | |
496 | goto error_poll_add; | |
497 | } | |
498 | ||
3fd27398 MD |
499 | lttng_relay_notify_ready(); |
500 | ||
9b5e0863 MD |
501 | if (testpoint(relayd_thread_live_listener)) { |
502 | goto error_testpoint; | |
503 | } | |
504 | ||
d3e2ba59 | 505 | while (1) { |
eea7556c MD |
506 | health_code_update(); |
507 | ||
d3e2ba59 JD |
508 | DBG("Listener accepting live viewers connections"); |
509 | ||
510 | restart: | |
eea7556c | 511 | health_poll_entry(); |
d3e2ba59 | 512 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 513 | health_poll_exit(); |
d3e2ba59 JD |
514 | if (ret < 0) { |
515 | /* | |
516 | * Restart interrupted system call. | |
517 | */ | |
518 | if (errno == EINTR) { | |
519 | goto restart; | |
520 | } | |
521 | goto error; | |
522 | } | |
523 | nb_fd = ret; | |
524 | ||
525 | DBG("Relay new viewer connection received"); | |
526 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
527 | health_code_update(); |
528 | ||
d3e2ba59 JD |
529 | /* Fetch once the poll data */ |
530 | revents = LTTNG_POLL_GETEV(&events, i); | |
531 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
532 | ||
e0077699 MD |
533 | if (!revents) { |
534 | /* No activity for this FD (poll implementation). */ | |
535 | continue; | |
536 | } | |
537 | ||
d3e2ba59 | 538 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 539 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
540 | if (ret) { |
541 | err = 0; | |
542 | goto exit; | |
543 | } | |
544 | ||
545 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
546 | ERR("socket poll error"); | |
547 | goto error; | |
548 | } else if (revents & LPOLLIN) { | |
549 | /* | |
9a78c92e MD |
550 | * A new connection is requested, therefore a |
551 | * viewer connection is allocated in this | |
552 | * thread, enqueued to a global queue and | |
553 | * dequeued (and freed) in the worker thread. | |
d3e2ba59 | 554 | */ |
58eb9381 DG |
555 | int val = 1; |
556 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
557 | struct lttcomm_sock *newsock; |
558 | ||
d3e2ba59 JD |
559 | newsock = live_control_sock->ops->accept(live_control_sock); |
560 | if (!newsock) { | |
561 | PERROR("accepting control sock"); | |
d3e2ba59 JD |
562 | goto error; |
563 | } | |
564 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 565 | |
d3e2ba59 | 566 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
58eb9381 | 567 | sizeof(val)); |
d3e2ba59 JD |
568 | if (ret < 0) { |
569 | PERROR("setsockopt inet"); | |
570 | lttcomm_destroy_sock(newsock); | |
d3e2ba59 JD |
571 | goto error; |
572 | } | |
9a78c92e MD |
573 | new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN); |
574 | if (!new_conn) { | |
575 | lttcomm_destroy_sock(newsock); | |
576 | goto error; | |
577 | } | |
578 | /* Ownership assumed by the connection. */ | |
579 | newsock = NULL; | |
d3e2ba59 | 580 | |
58eb9381 | 581 | /* Enqueue request for the dispatcher thread. */ |
8bdee6e2 SM |
582 | cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail, |
583 | &new_conn->qnode); | |
d3e2ba59 JD |
584 | |
585 | /* | |
9a78c92e MD |
586 | * Wake the dispatch queue futex. |
587 | * Implicit memory barrier with the | |
588 | * exchange in cds_wfcq_enqueue. | |
d3e2ba59 | 589 | */ |
58eb9381 | 590 | futex_nto1_wake(&viewer_conn_queue.futex); |
d3e2ba59 JD |
591 | } |
592 | } | |
593 | } | |
594 | ||
595 | exit: | |
596 | error: | |
597 | error_poll_add: | |
9b5e0863 | 598 | error_testpoint: |
d3e2ba59 JD |
599 | lttng_poll_clean(&events); |
600 | error_create_poll: | |
601 | if (live_control_sock->fd >= 0) { | |
602 | ret = live_control_sock->ops->close(live_control_sock); | |
603 | if (ret) { | |
604 | PERROR("close"); | |
605 | } | |
606 | } | |
607 | lttcomm_destroy_sock(live_control_sock); | |
608 | error_sock_control: | |
609 | if (err) { | |
eea7556c | 610 | health_error(); |
d3e2ba59 JD |
611 | DBG("Live viewer listener thread exited with error"); |
612 | } | |
eea7556c | 613 | health_unregister(health_relayd); |
d3e2ba59 | 614 | DBG("Live viewer listener thread cleanup complete"); |
770f96f4 MD |
615 | if (lttng_relay_stop_threads()) { |
616 | ERR("Error stopping threads"); | |
77c54fed | 617 | } |
d3e2ba59 JD |
618 | return NULL; |
619 | } | |
620 | ||
621 | /* | |
622 | * This thread manages the dispatching of the requests to worker threads | |
623 | */ | |
624 | static | |
625 | void *thread_dispatcher(void *data) | |
626 | { | |
6cd525e8 MD |
627 | int err = -1; |
628 | ssize_t ret; | |
8bdee6e2 | 629 | struct cds_wfcq_node *node; |
58eb9381 | 630 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
631 | |
632 | DBG("[thread] Live viewer relay dispatcher started"); | |
633 | ||
eea7556c MD |
634 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
635 | ||
9b5e0863 MD |
636 | if (testpoint(relayd_thread_live_dispatcher)) { |
637 | goto error_testpoint; | |
638 | } | |
639 | ||
eea7556c MD |
640 | health_code_update(); |
641 | ||
d3e2ba59 | 642 | while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
eea7556c MD |
643 | health_code_update(); |
644 | ||
d3e2ba59 | 645 | /* Atomically prepare the queue futex */ |
58eb9381 | 646 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 JD |
647 | |
648 | do { | |
eea7556c MD |
649 | health_code_update(); |
650 | ||
d3e2ba59 | 651 | /* Dequeue commands */ |
8bdee6e2 SM |
652 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
653 | &viewer_conn_queue.tail); | |
d3e2ba59 JD |
654 | if (node == NULL) { |
655 | DBG("Woken up but nothing in the live-viewer " | |
656 | "relay command queue"); | |
657 | /* Continue thread execution */ | |
658 | break; | |
659 | } | |
58eb9381 | 660 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 661 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 662 | conn->sock->fd); |
d3e2ba59 JD |
663 | |
664 | /* | |
9a78c92e MD |
665 | * Inform worker thread of the new request. This |
666 | * call is blocking so we can be assured that | |
667 | * the data will be read at some point in time | |
668 | * or wait to the end of the world :) | |
d3e2ba59 | 669 | */ |
58eb9381 DG |
670 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
671 | if (ret < 0) { | |
672 | PERROR("write conn pipe"); | |
9a78c92e | 673 | connection_put(conn); |
d3e2ba59 JD |
674 | goto error; |
675 | } | |
676 | } while (node != NULL); | |
677 | ||
678 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 679 | health_poll_entry(); |
58eb9381 | 680 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 681 | health_poll_exit(); |
d3e2ba59 JD |
682 | } |
683 | ||
eea7556c MD |
684 | /* Normal exit, no error */ |
685 | err = 0; | |
686 | ||
d3e2ba59 | 687 | error: |
9b5e0863 | 688 | error_testpoint: |
eea7556c MD |
689 | if (err) { |
690 | health_error(); | |
691 | ERR("Health error occurred in %s", __func__); | |
692 | } | |
693 | health_unregister(health_relayd); | |
d3e2ba59 | 694 | DBG("Live viewer dispatch thread dying"); |
770f96f4 MD |
695 | if (lttng_relay_stop_threads()) { |
696 | ERR("Error stopping threads"); | |
77c54fed | 697 | } |
d3e2ba59 JD |
698 | return NULL; |
699 | } | |
700 | ||
701 | /* | |
702 | * Establish connection with the viewer and check the versions. | |
703 | * | |
704 | * Return 0 on success or else negative value. | |
705 | */ | |
706 | static | |
58eb9381 | 707 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
708 | { |
709 | int ret; | |
710 | struct lttng_viewer_connect reply, msg; | |
711 | ||
58eb9381 | 712 | conn->version_check_done = 1; |
d3e2ba59 | 713 | |
eea7556c MD |
714 | health_code_update(); |
715 | ||
2f8f53af DG |
716 | DBG("Viewer is establishing a connection to the relayd."); |
717 | ||
58eb9381 | 718 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 719 | if (ret < 0) { |
d3e2ba59 JD |
720 | goto end; |
721 | } | |
722 | ||
eea7556c MD |
723 | health_code_update(); |
724 | ||
f46b2ce6 | 725 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
726 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
727 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
728 | ||
729 | /* Major versions must be the same */ | |
730 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
731 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
732 | reply.major, be32toh(msg.major)); | |
72180669 | 733 | ret = -1; |
d3e2ba59 JD |
734 | goto end; |
735 | } | |
736 | ||
58eb9381 | 737 | conn->major = reply.major; |
d3e2ba59 JD |
738 | /* We adapt to the lowest compatible version */ |
739 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 740 | conn->minor = reply.minor; |
d3e2ba59 | 741 | } else { |
58eb9381 | 742 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
743 | } |
744 | ||
c4e361a4 | 745 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 746 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 747 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 748 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
749 | } else { |
750 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
751 | ret = -1; | |
752 | goto end; | |
753 | } | |
754 | ||
755 | reply.major = htobe32(reply.major); | |
756 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 757 | if (conn->type == RELAY_VIEWER_COMMAND) { |
19eba299 | 758 | /* |
9a78c92e MD |
759 | * Increment outside of htobe64 macro, because the argument can |
760 | * be used more than once within the macro, and thus the | |
761 | * operation may be undefined. | |
19eba299 | 762 | */ |
9a78c92e | 763 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
19eba299 | 764 | last_relay_viewer_session_id++; |
9a78c92e | 765 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
19eba299 | 766 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 767 | } |
eea7556c MD |
768 | |
769 | health_code_update(); | |
770 | ||
58eb9381 | 771 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 772 | if (ret < 0) { |
2f8f53af | 773 | goto end; |
d3e2ba59 JD |
774 | } |
775 | ||
eea7556c MD |
776 | health_code_update(); |
777 | ||
58eb9381 | 778 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
779 | ret = 0; |
780 | ||
781 | end: | |
782 | return ret; | |
783 | } | |
784 | ||
785 | /* | |
786 | * Send the viewer the list of current sessions. | |
9a78c92e MD |
787 | * We need to create a copy of the hash table content because otherwise |
788 | * we cannot assume the number of entries stays the same between getting | |
789 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
790 | * |
791 | * Return 0 on success or else a negative value. | |
792 | */ | |
793 | static | |
58eb9381 | 794 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 JD |
795 | { |
796 | int ret; | |
797 | struct lttng_viewer_list_sessions session_list; | |
d3e2ba59 | 798 | struct lttng_ht_iter iter; |
d3e2ba59 | 799 | struct relay_session *session; |
9a78c92e MD |
800 | struct lttng_viewer_session *send_session_buf = NULL; |
801 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; | |
802 | uint32_t count = 0; | |
d3e2ba59 JD |
803 | |
804 | DBG("List sessions received"); | |
805 | ||
9a78c92e MD |
806 | send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf)); |
807 | if (!send_session_buf) { | |
808 | return -1; | |
d3e2ba59 JD |
809 | } |
810 | ||
9a78c92e MD |
811 | rcu_read_lock(); |
812 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, | |
2f8f53af | 813 | session_n.node) { |
9a78c92e | 814 | struct lttng_viewer_session *send_session; |
d3e2ba59 | 815 | |
eea7556c MD |
816 | health_code_update(); |
817 | ||
9a78c92e MD |
818 | if (count >= buf_count) { |
819 | struct lttng_viewer_session *newbuf; | |
820 | uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 821 | |
9a78c92e MD |
822 | newbuf = realloc(send_session_buf, |
823 | new_buf_count * sizeof(*send_session_buf)); | |
824 | if (!newbuf) { | |
825 | ret = -1; | |
826 | rcu_read_unlock(); | |
827 | goto end_free; | |
828 | } | |
829 | send_session_buf = newbuf; | |
830 | buf_count = new_buf_count; | |
6763619c | 831 | } |
9a78c92e MD |
832 | send_session = &send_session_buf[count]; |
833 | strncpy(send_session->session_name, session->session_name, | |
834 | sizeof(send_session->session_name)); | |
835 | strncpy(send_session->hostname, session->hostname, | |
836 | sizeof(send_session->hostname)); | |
837 | send_session->id = htobe64(session->id); | |
838 | send_session->live_timer = htobe32(session->live_timer); | |
839 | if (session->viewer_attached) { | |
840 | send_session->clients = htobe32(1); | |
841 | } else { | |
842 | send_session->clients = htobe32(0); | |
d227d5bd | 843 | } |
9a78c92e MD |
844 | send_session->streams = htobe32(session->stream_count); |
845 | count++; | |
846 | } | |
847 | rcu_read_unlock(); | |
d227d5bd | 848 | |
9a78c92e | 849 | session_list.sessions_count = htobe32(count); |
d227d5bd | 850 | |
9a78c92e | 851 | health_code_update(); |
d227d5bd | 852 | |
9a78c92e MD |
853 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
854 | if (ret < 0) { | |
855 | goto end_free; | |
d227d5bd | 856 | } |
d227d5bd | 857 | |
9a78c92e | 858 | health_code_update(); |
d227d5bd | 859 | |
9a78c92e MD |
860 | ret = send_response(conn->sock, send_session_buf, |
861 | count * sizeof(*send_session_buf)); | |
862 | if (ret < 0) { | |
863 | goto end_free; | |
d227d5bd | 864 | } |
9a78c92e | 865 | health_code_update(); |
d227d5bd | 866 | |
9a78c92e MD |
867 | ret = 0; |
868 | end_free: | |
869 | free(send_session_buf); | |
870 | return ret; | |
d227d5bd JD |
871 | } |
872 | ||
80e8027a | 873 | /* |
9a78c92e | 874 | * Send the viewer the list of current streams. |
80e8027a JD |
875 | */ |
876 | static | |
58eb9381 | 877 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
878 | { |
879 | int ret, send_streams = 0; | |
9a78c92e | 880 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
881 | struct lttng_viewer_new_streams_request request; |
882 | struct lttng_viewer_new_streams_response response; | |
80e8027a | 883 | struct relay_session *session; |
6763619c | 884 | uint64_t session_id; |
11436961 | 885 | bool closed = false; |
80e8027a | 886 | |
58eb9381 | 887 | assert(conn); |
80e8027a JD |
888 | |
889 | DBG("Get new streams received"); | |
890 | ||
80e8027a JD |
891 | health_code_update(); |
892 | ||
2f8f53af | 893 | /* Receive the request from the connected client. */ |
58eb9381 | 894 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 895 | if (ret < 0) { |
80e8027a JD |
896 | goto error; |
897 | } | |
6763619c | 898 | session_id = be64toh(request.session_id); |
80e8027a JD |
899 | |
900 | health_code_update(); | |
901 | ||
53efb85a MD |
902 | memset(&response, 0, sizeof(response)); |
903 | ||
9a78c92e | 904 | session = session_get_by_id(session_id); |
2f8f53af | 905 | if (!session) { |
6763619c | 906 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 907 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
908 | goto send_reply; |
909 | } | |
910 | ||
9a78c92e | 911 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
80e8027a | 912 | send_streams = 0; |
c4e361a4 | 913 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
914 | goto send_reply; |
915 | } | |
916 | ||
6763619c JD |
917 | send_streams = 1; |
918 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
919 | ||
9a78c92e | 920 | ret = make_viewer_streams(session, LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent, |
11436961 | 921 | &nb_created, &closed); |
2f8f53af | 922 | if (ret < 0) { |
9a78c92e | 923 | goto end_put_session; |
2f8f53af DG |
924 | } |
925 | /* Only send back the newly created streams with the unsent ones. */ | |
926 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
927 | response.streams_count = htobe32(nb_streams); |
928 | ||
4479f682 | 929 | /* |
64bda0b4 MD |
930 | * If the session is closed, HUP when there are no more streams |
931 | * with data. | |
4479f682 | 932 | */ |
11436961 | 933 | if (closed && nb_total == 0) { |
4479f682 | 934 | send_streams = 0; |
11436961 | 935 | response.streams_count = 0; |
4479f682 JD |
936 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
937 | goto send_reply; | |
938 | } | |
939 | ||
80e8027a JD |
940 | send_reply: |
941 | health_code_update(); | |
58eb9381 | 942 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 943 | if (ret < 0) { |
9a78c92e | 944 | goto end_put_session; |
80e8027a JD |
945 | } |
946 | health_code_update(); | |
947 | ||
948 | /* | |
9a78c92e MD |
949 | * Unknown or empty session, just return gracefully, the viewer |
950 | * knows what is happening. | |
80e8027a JD |
951 | */ |
952 | if (!send_streams || !nb_streams) { | |
953 | ret = 0; | |
9a78c92e | 954 | goto end_put_session; |
80e8027a JD |
955 | } |
956 | ||
2f8f53af | 957 | /* |
9a78c92e MD |
958 | * Send stream and *DON'T* ignore the sent flag so every viewer |
959 | * streams that were not sent from that point will be sent to | |
960 | * the viewer. | |
2f8f53af | 961 | */ |
58eb9381 | 962 | ret = send_viewer_streams(conn->sock, session, 0); |
2f8f53af | 963 | if (ret < 0) { |
9a78c92e | 964 | goto end_put_session; |
80e8027a JD |
965 | } |
966 | ||
9a78c92e MD |
967 | end_put_session: |
968 | if (session) { | |
969 | session_put(session); | |
970 | } | |
80e8027a JD |
971 | error: |
972 | return ret; | |
973 | } | |
974 | ||
d3e2ba59 JD |
975 | /* |
976 | * Send the viewer the list of current sessions. | |
977 | */ | |
978 | static | |
58eb9381 | 979 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 980 | { |
2f8f53af DG |
981 | int send_streams = 0; |
982 | ssize_t ret; | |
80e8027a | 983 | uint32_t nb_streams = 0; |
2f8f53af | 984 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
985 | struct lttng_viewer_attach_session_request request; |
986 | struct lttng_viewer_attach_session_response response; | |
9a78c92e | 987 | struct relay_session *session = NULL; |
11436961 | 988 | bool closed = false; |
d3e2ba59 | 989 | |
58eb9381 | 990 | assert(conn); |
d3e2ba59 | 991 | |
eea7556c MD |
992 | health_code_update(); |
993 | ||
2f8f53af | 994 | /* Receive the request from the connected client. */ |
58eb9381 | 995 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 996 | if (ret < 0) { |
d3e2ba59 JD |
997 | goto error; |
998 | } | |
999 | ||
eea7556c MD |
1000 | health_code_update(); |
1001 | ||
53efb85a MD |
1002 | memset(&response, 0, sizeof(response)); |
1003 | ||
c3b7390b JD |
1004 | if (!conn->viewer_session) { |
1005 | DBG("Client trying to attach before creating a live viewer session"); | |
1006 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
1007 | goto send_reply; | |
1008 | } | |
1009 | ||
9a78c92e | 1010 | session = session_get_by_id(be64toh(request.session_id)); |
2f8f53af | 1011 | if (!session) { |
d3e2ba59 JD |
1012 | DBG("Relay session %" PRIu64 " not found", |
1013 | be64toh(request.session_id)); | |
c4e361a4 | 1014 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
1015 | goto send_reply; |
1016 | } | |
9a78c92e MD |
1017 | DBG("Attach session ID %" PRIu64 " received", |
1018 | be64toh(request.session_id)); | |
d3e2ba59 | 1019 | |
9a78c92e | 1020 | if (session->live_timer == 0) { |
d3e2ba59 | 1021 | DBG("Not live session"); |
c4e361a4 | 1022 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 | 1023 | goto send_reply; |
9a78c92e MD |
1024 | } |
1025 | ||
1026 | send_streams = 1; | |
1027 | ret = viewer_session_attach(conn->viewer_session, session); | |
1028 | if (ret) { | |
1029 | DBG("Already a viewer attached"); | |
1030 | response.status = htobe32(LTTNG_VIEWER_ATTACH_ALREADY); | |
1031 | goto send_reply; | |
d3e2ba59 JD |
1032 | } |
1033 | ||
1034 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1035 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1036 | case LTTNG_VIEWER_SEEK_LAST: | |
9a78c92e | 1037 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
2f8f53af | 1038 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
1039 | break; |
1040 | default: | |
1041 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1042 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1043 | send_streams = 0; |
1044 | goto send_reply; | |
1045 | } | |
1046 | ||
11436961 MD |
1047 | ret = make_viewer_streams(session, seek_type, &nb_streams, NULL, |
1048 | NULL, &closed); | |
2f8f53af | 1049 | if (ret < 0) { |
9a78c92e | 1050 | goto end_put_session; |
d3e2ba59 | 1051 | } |
2f8f53af | 1052 | response.streams_count = htobe32(nb_streams); |
d3e2ba59 | 1053 | |
11436961 MD |
1054 | /* |
1055 | * If the session is closed when the viewer is attaching, it | |
1056 | * means some of the streams may have been concurrently removed, | |
1057 | * so we don't allow the viewer to attach, even if there are | |
1058 | * streams available. | |
1059 | */ | |
1060 | if (closed) { | |
1061 | send_streams = 0; | |
1062 | response.streams_count = 0; | |
1063 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); | |
1064 | goto send_reply; | |
1065 | } | |
1066 | ||
d3e2ba59 | 1067 | send_reply: |
eea7556c | 1068 | health_code_update(); |
58eb9381 | 1069 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1070 | if (ret < 0) { |
9a78c92e | 1071 | goto end_put_session; |
d3e2ba59 | 1072 | } |
eea7556c | 1073 | health_code_update(); |
d3e2ba59 JD |
1074 | |
1075 | /* | |
9a78c92e MD |
1076 | * Unknown or empty session, just return gracefully, the viewer |
1077 | * knows what is happening. | |
d3e2ba59 | 1078 | */ |
157df586 | 1079 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1080 | ret = 0; |
9a78c92e | 1081 | goto end_put_session; |
d3e2ba59 JD |
1082 | } |
1083 | ||
2f8f53af | 1084 | /* Send stream and ignore the sent flag. */ |
58eb9381 | 1085 | ret = send_viewer_streams(conn->sock, session, 1); |
2f8f53af | 1086 | if (ret < 0) { |
9a78c92e | 1087 | goto end_put_session; |
d3e2ba59 | 1088 | } |
d3e2ba59 | 1089 | |
9a78c92e MD |
1090 | end_put_session: |
1091 | if (session) { | |
1092 | session_put(session); | |
1093 | } | |
4a9daf17 JD |
1094 | error: |
1095 | return ret; | |
1096 | } | |
1097 | ||
878c34cf DG |
1098 | /* |
1099 | * Open the index file if needed for the given vstream. | |
1100 | * | |
9a78c92e MD |
1101 | * If an index file is successfully opened, the vstream index_fd set with |
1102 | * it. | |
878c34cf DG |
1103 | * |
1104 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
9a78c92e MD |
1105 | * |
1106 | * Called with rstream lock held. | |
878c34cf DG |
1107 | */ |
1108 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1109 | struct relay_stream *rstream) | |
1110 | { | |
1111 | int ret = 0; | |
1112 | ||
9a78c92e | 1113 | if (vstream->index_fd) { |
878c34cf DG |
1114 | goto end; |
1115 | } | |
1116 | ||
1117 | /* | |
9a78c92e | 1118 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1119 | */ |
9a78c92e | 1120 | if (rstream->total_index_received == 0) { |
878c34cf DG |
1121 | ret = -ENOENT; |
1122 | goto end; | |
1123 | } | |
1124 | ret = index_open(vstream->path_name, vstream->channel_name, | |
9a78c92e MD |
1125 | vstream->stream->tracefile_count, |
1126 | vstream->current_tracefile_id); | |
878c34cf | 1127 | if (ret >= 0) { |
9a78c92e MD |
1128 | vstream->index_fd = stream_fd_create(ret); |
1129 | if (!vstream->index_fd) { | |
1130 | if (close(ret)) { | |
1131 | PERROR("close"); | |
1132 | } | |
1133 | ret = -1; | |
1134 | } else { | |
1135 | ret = 0; | |
1136 | } | |
878c34cf DG |
1137 | goto end; |
1138 | } | |
1139 | ||
1140 | end: | |
1141 | return ret; | |
1142 | } | |
1143 | ||
1144 | /* | |
9a78c92e MD |
1145 | * Check the status of the index for the given stream. This function |
1146 | * updates the index structure if needed and can put (close) the vstream | |
1147 | * in the HUP situation. | |
1148 | * | |
1149 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1150 | * that the index has been updated and is ready to be sent to the | |
1151 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1152 | * |
9a78c92e | 1153 | * Called with rstream lock held. |
878c34cf DG |
1154 | */ |
1155 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1156 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1157 | struct lttng_viewer_index *index) | |
1158 | { | |
1159 | int ret; | |
1160 | ||
9a78c92e MD |
1161 | if (trace->session->connection_closed |
1162 | && rstream->total_index_received | |
1163 | == vstream->last_sent_index) { | |
1164 | /* Last index sent and session connection is closed. */ | |
1165 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1166 | goto hup; | |
1167 | } else if (rstream->beacon_ts_end != -1ULL && | |
1168 | rstream->total_index_received | |
1169 | == vstream->last_sent_index) { | |
1170 | /* | |
1171 | * We've received a synchronization beacon and the last index | |
1172 | * available has been sent, the index for now is inactive. | |
1173 | * | |
1174 | * In this case, we have received a beacon which allows us to | |
1175 | * inform the client of a time interval during which we can | |
1176 | * guarantee that there are no events to read (and never will | |
1177 | * be). | |
1178 | */ | |
1179 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1180 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1181 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
1182 | goto index_ready; | |
1183 | } else if (rstream->total_index_received <= vstream->last_sent_index) { | |
1184 | /* | |
1185 | * This actually checks the case where recv == last_sent. | |
1186 | * In this case, we have not received a beacon. Therefore, we | |
1187 | * can only ask the client to retry later. | |
1188 | */ | |
1189 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1190 | goto index_ready; | |
1191 | } else if (!viewer_stream_is_tracefile_seq_readable(vstream, | |
1192 | vstream->current_tracefile_seq)) { | |
1193 | /* | |
1194 | * The producer has overwritten our current file. We | |
1195 | * need to rotate. | |
1196 | */ | |
1197 | DBG("Viewer stream %" PRIu64 " rotation due to overwrite", | |
1198 | vstream->stream->stream_handle); | |
1199 | ret = viewer_stream_rotate(vstream); | |
1200 | if (ret < 0) { | |
1201 | goto end; | |
1202 | } else if (ret == 1) { | |
1203 | /* EOF across entire stream. */ | |
1204 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1205 | goto hup; | |
1206 | } | |
1207 | assert(viewer_stream_is_tracefile_seq_readable(vstream, | |
1208 | vstream->current_tracefile_seq)); | |
1209 | /* ret == 0 means successful so we continue. */ | |
1210 | ret = 0; | |
1211 | } else { | |
1212 | ssize_t read_ret; | |
1213 | char tmp[1]; | |
1214 | ||
1215 | /* | |
1216 | * Use EOF on current index file to find out when we | |
1217 | * need to rotate. | |
1218 | */ | |
1219 | read_ret = lttng_read(vstream->index_fd->fd, tmp, 1); | |
1220 | if (read_ret == 1) { | |
1221 | off_t seek_ret; | |
1222 | ||
1223 | /* There is still data to read. Rewind position. */ | |
1224 | seek_ret = lseek(vstream->index_fd->fd, -1, SEEK_CUR); | |
1225 | if (seek_ret < 0) { | |
1226 | ret = -1; | |
1227 | goto end; | |
1228 | } | |
1229 | ret = 0; | |
1230 | } else if (read_ret == 0) { | |
1231 | /* EOF. We need to rotate. */ | |
1232 | DBG("Viewer stream %" PRIu64 " rotation due to EOF", | |
1233 | vstream->stream->stream_handle); | |
1234 | ret = viewer_stream_rotate(vstream); | |
878c34cf | 1235 | if (ret < 0) { |
9a78c92e | 1236 | goto end; |
878c34cf | 1237 | } else if (ret == 1) { |
9a78c92e | 1238 | /* EOF across entire stream. */ |
878c34cf DG |
1239 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
1240 | goto hup; | |
1241 | } | |
9a78c92e MD |
1242 | assert(viewer_stream_is_tracefile_seq_readable(vstream, |
1243 | vstream->current_tracefile_seq)); | |
878c34cf | 1244 | /* ret == 0 means successful so we continue. */ |
9a78c92e MD |
1245 | ret = 0; |
1246 | } else { | |
1247 | /* Error reading index. */ | |
1248 | ret = -1; | |
878c34cf | 1249 | } |
878c34cf | 1250 | } |
9a78c92e | 1251 | end: |
878c34cf DG |
1252 | return ret; |
1253 | ||
1254 | hup: | |
9a78c92e | 1255 | viewer_stream_put(vstream); |
878c34cf DG |
1256 | index_ready: |
1257 | return 1; | |
1258 | } | |
1259 | ||
d3e2ba59 JD |
1260 | /* |
1261 | * Send the next index for a stream. | |
1262 | * | |
1263 | * Return 0 on success or else a negative value. | |
1264 | */ | |
1265 | static | |
58eb9381 | 1266 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1267 | { |
1268 | int ret; | |
878c34cf | 1269 | ssize_t read_ret; |
d3e2ba59 JD |
1270 | struct lttng_viewer_get_next_index request_index; |
1271 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1272 | struct ctf_packet_index packet_index; |
9a78c92e MD |
1273 | struct relay_viewer_stream *vstream = NULL; |
1274 | struct relay_stream *rstream = NULL; | |
1275 | struct ctf_trace *ctf_trace = NULL; | |
1276 | struct relay_viewer_stream *metadata_viewer_stream = NULL; | |
d3e2ba59 | 1277 | |
58eb9381 | 1278 | assert(conn); |
d3e2ba59 JD |
1279 | |
1280 | DBG("Viewer get next index"); | |
1281 | ||
9a78c92e | 1282 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1283 | health_code_update(); |
2f8f53af | 1284 | |
58eb9381 | 1285 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1286 | if (ret < 0) { |
d3e2ba59 JD |
1287 | goto end; |
1288 | } | |
eea7556c | 1289 | health_code_update(); |
d3e2ba59 | 1290 | |
9a78c92e | 1291 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1292 | if (!vstream) { |
387137a7 MD |
1293 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1294 | goto send_reply; | |
2a174661 DG |
1295 | } |
1296 | ||
9a78c92e MD |
1297 | /* Use back. ref. Protected by refcounts. */ |
1298 | rstream = vstream->stream; | |
1299 | ctf_trace = rstream->trace; | |
d3e2ba59 | 1300 | |
9a78c92e MD |
1301 | /* metadata_viewer_stream may be NULL. */ |
1302 | metadata_viewer_stream = | |
1303 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
2a174661 | 1304 | |
9a78c92e | 1305 | pthread_mutex_lock(&rstream->lock); |
d3e2ba59 JD |
1306 | |
1307 | /* | |
1308 | * The viewer should not ask for index on metadata stream. | |
1309 | */ | |
9a78c92e | 1310 | if (rstream->is_metadata) { |
c4e361a4 | 1311 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
d3e2ba59 JD |
1312 | goto send_reply; |
1313 | } | |
1314 | ||
878c34cf DG |
1315 | /* Try to open an index if one is needed for that stream. */ |
1316 | ret = try_open_index(vstream, rstream); | |
1317 | if (ret < 0) { | |
0e6830aa | 1318 | if (ret == -ENOENT) { |
d3e2ba59 | 1319 | /* |
9a78c92e MD |
1320 | * The index is created only when the first data |
1321 | * packet arrives, it might not be ready at the | |
1322 | * beginning of the session | |
d3e2ba59 | 1323 | */ |
c4e361a4 | 1324 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); |
878c34cf DG |
1325 | } else { |
1326 | /* Unhandled error. */ | |
c4e361a4 | 1327 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
d3e2ba59 | 1328 | } |
878c34cf | 1329 | goto send_reply; |
d3e2ba59 JD |
1330 | } |
1331 | ||
878c34cf | 1332 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
878c34cf | 1333 | if (ret < 0) { |
9a78c92e | 1334 | goto error_put; |
878c34cf DG |
1335 | } else if (ret == 1) { |
1336 | /* | |
9a78c92e MD |
1337 | * We have no index to send and check_index_status has populated |
1338 | * viewer_index's status. | |
878c34cf | 1339 | */ |
d3e2ba59 JD |
1340 | goto send_reply; |
1341 | } | |
9a78c92e | 1342 | /* At this point, ret is 0 thus we will be able to read the index. */ |
878c34cf | 1343 | assert(!ret); |
d3e2ba59 | 1344 | |
9a78c92e MD |
1345 | /* |
1346 | * vstream->stream_fd may be NULL if it has been closed by | |
1347 | * tracefile rotation, or if we are at the beginning of the | |
1348 | * stream. We open the data stream file here to protect against | |
1349 | * overwrite caused by tracefile rotation (in association with | |
1350 | * unlink performed before overwrite). | |
1351 | */ | |
1352 | if (!vstream->stream_fd) { | |
1353 | char fullpath[PATH_MAX]; | |
1354 | ||
1355 | if (vstream->stream->tracefile_count > 0) { | |
1356 | ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64, | |
1357 | vstream->path_name, | |
1358 | vstream->channel_name, | |
1359 | vstream->current_tracefile_id); | |
1360 | } else { | |
1361 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", | |
1362 | vstream->path_name, | |
1363 | vstream->channel_name); | |
1364 | } | |
1365 | if (ret < 0) { | |
1366 | goto error_put; | |
1367 | } | |
1368 | ret = open(fullpath, O_RDONLY); | |
1369 | if (ret < 0) { | |
1370 | PERROR("Relay opening trace file"); | |
1371 | goto error_put; | |
1372 | } | |
1373 | vstream->stream_fd = stream_fd_create(ret); | |
1374 | if (!vstream->stream_fd) { | |
1375 | if (close(ret)) { | |
1376 | PERROR("close"); | |
1377 | } | |
1378 | goto error_put; | |
1379 | } | |
d3e2ba59 JD |
1380 | } |
1381 | ||
f04a971b | 1382 | ret = check_new_streams(conn); |
4a9daf17 | 1383 | if (ret < 0) { |
9a78c92e MD |
1384 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1385 | goto send_reply; | |
4a9daf17 JD |
1386 | } else if (ret == 1) { |
1387 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1388 | } | |
1389 | ||
9a78c92e | 1390 | read_ret = lttng_read(vstream->index_fd->fd, &packet_index, |
6cd525e8 | 1391 | sizeof(packet_index)); |
9a78c92e MD |
1392 | if (read_ret < sizeof(packet_index)) { |
1393 | ERR("Relay reading index file %d returned %zd", | |
1394 | vstream->index_fd->fd, read_ret); | |
1395 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); | |
6b6b9a5a | 1396 | goto send_reply; |
d3e2ba59 | 1397 | } else { |
c4e361a4 | 1398 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
d3e2ba59 JD |
1399 | vstream->last_sent_index++; |
1400 | } | |
1401 | ||
1402 | /* | |
1403 | * Indexes are stored in big endian, no need to switch before sending. | |
1404 | */ | |
9a78c92e MD |
1405 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
1406 | rstream->stream_handle, | |
1407 | be64toh(packet_index.offset)); | |
d3e2ba59 JD |
1408 | viewer_index.offset = packet_index.offset; |
1409 | viewer_index.packet_size = packet_index.packet_size; | |
1410 | viewer_index.content_size = packet_index.content_size; | |
1411 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1412 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1413 | viewer_index.events_discarded = packet_index.events_discarded; | |
1414 | viewer_index.stream_id = packet_index.stream_id; | |
1415 | ||
1416 | send_reply: | |
387137a7 MD |
1417 | if (rstream) { |
1418 | pthread_mutex_unlock(&rstream->lock); | |
1419 | } | |
9a78c92e MD |
1420 | |
1421 | if (metadata_viewer_stream) { | |
1422 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
1423 | DBG("get next index metadata check: recv %" PRIu64 | |
1424 | " sent %" PRIu64, | |
1425 | metadata_viewer_stream->stream->metadata_received, | |
1426 | metadata_viewer_stream->metadata_sent); | |
1427 | if (!metadata_viewer_stream->stream->metadata_received || | |
1428 | metadata_viewer_stream->stream->metadata_received > | |
1429 | metadata_viewer_stream->metadata_sent) { | |
1430 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1431 | } | |
1432 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
1433 | } | |
1434 | ||
d3e2ba59 | 1435 | viewer_index.flags = htobe32(viewer_index.flags); |
eea7556c | 1436 | health_code_update(); |
2f8f53af | 1437 | |
58eb9381 | 1438 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1439 | if (ret < 0) { |
9a78c92e | 1440 | goto end; |
d3e2ba59 | 1441 | } |
eea7556c | 1442 | health_code_update(); |
d3e2ba59 | 1443 | |
2f8f53af | 1444 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", |
9a78c92e MD |
1445 | vstream->last_sent_index, |
1446 | vstream->stream->stream_handle); | |
d3e2ba59 | 1447 | end: |
9a78c92e MD |
1448 | if (metadata_viewer_stream) { |
1449 | viewer_stream_put(metadata_viewer_stream); | |
1450 | } | |
1451 | if (vstream) { | |
1452 | viewer_stream_put(vstream); | |
1453 | } | |
1454 | return ret; | |
1455 | ||
1456 | error_put: | |
1457 | pthread_mutex_unlock(&rstream->lock); | |
1458 | if (metadata_viewer_stream) { | |
1459 | viewer_stream_put(metadata_viewer_stream); | |
1460 | } | |
1461 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
1462 | return ret; |
1463 | } | |
1464 | ||
1465 | /* | |
1466 | * Send the next index for a stream | |
1467 | * | |
1468 | * Return 0 on success or else a negative value. | |
1469 | */ | |
1470 | static | |
58eb9381 | 1471 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 JD |
1472 | { |
1473 | int ret, send_data = 0; | |
1474 | char *data = NULL; | |
1475 | uint32_t len = 0; | |
1476 | ssize_t read_len; | |
1477 | struct lttng_viewer_get_packet get_packet_info; | |
1478 | struct lttng_viewer_trace_packet reply; | |
9a78c92e | 1479 | struct relay_viewer_stream *vstream = NULL; |
2a174661 | 1480 | struct ctf_trace *ctf_trace; |
9a78c92e | 1481 | struct relay_viewer_stream *metadata_viewer_stream = NULL; |
d3e2ba59 JD |
1482 | |
1483 | DBG2("Relay get data packet"); | |
1484 | ||
eea7556c | 1485 | health_code_update(); |
2f8f53af | 1486 | |
9a78c92e MD |
1487 | ret = recv_request(conn->sock, &get_packet_info, |
1488 | sizeof(get_packet_info)); | |
2f8f53af | 1489 | if (ret < 0) { |
d3e2ba59 JD |
1490 | goto end; |
1491 | } | |
eea7556c | 1492 | health_code_update(); |
d3e2ba59 | 1493 | |
0233a6a5 DG |
1494 | /* From this point on, the error label can be reached. */ |
1495 | memset(&reply, 0, sizeof(reply)); | |
1496 | ||
9a78c92e MD |
1497 | vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id)); |
1498 | if (!vstream) { | |
4da923bd MD |
1499 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
1500 | goto send_reply_nolock; | |
d3e2ba59 | 1501 | } |
2a174661 | 1502 | |
9a78c92e | 1503 | ctf_trace = vstream->stream->trace; |
6763619c | 1504 | |
9a78c92e MD |
1505 | /* metadata_viewer_stream may be NULL. */ |
1506 | metadata_viewer_stream = | |
1507 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
d3e2ba59 | 1508 | |
9a78c92e MD |
1509 | if (metadata_viewer_stream) { |
1510 | bool get_packet_err = false; | |
d3e2ba59 | 1511 | |
9a78c92e MD |
1512 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); |
1513 | DBG("get packet metadata check: recv %" PRIu64 " sent %" PRIu64, | |
1514 | metadata_viewer_stream->stream->metadata_received, | |
1515 | metadata_viewer_stream->metadata_sent); | |
1516 | if (!metadata_viewer_stream->stream->metadata_received || | |
1517 | metadata_viewer_stream->stream->metadata_received > | |
1518 | metadata_viewer_stream->metadata_sent) { | |
1519 | /* | |
1520 | * We prevent the client from reading a data stream as | |
1521 | * long as there is metadata left to consume. This | |
1522 | * ensures that the client won't receive data of which | |
1523 | * it can't make sense. | |
1524 | */ | |
1525 | get_packet_err = true; | |
d3e2ba59 | 1526 | } |
9a78c92e MD |
1527 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); |
1528 | viewer_stream_put(metadata_viewer_stream); | |
1529 | if (get_packet_err) { | |
1530 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); | |
1531 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1532 | goto send_reply_nolock; | |
d3e2ba59 | 1533 | } |
d3e2ba59 JD |
1534 | } |
1535 | ||
9a78c92e | 1536 | pthread_mutex_lock(&vstream->stream->lock); |
4a9daf17 | 1537 | |
d3e2ba59 JD |
1538 | len = be32toh(get_packet_info.len); |
1539 | data = zmalloc(len); | |
1540 | if (!data) { | |
1541 | PERROR("relay data zmalloc"); | |
1542 | goto error; | |
1543 | } | |
1544 | ||
9a78c92e MD |
1545 | ret = lseek(vstream->stream_fd->fd, be64toh(get_packet_info.offset), |
1546 | SEEK_SET); | |
d3e2ba59 | 1547 | if (ret < 0) { |
9a78c92e MD |
1548 | PERROR("lseek fd %d to offset %" PRIu64, vstream->stream_fd->fd, |
1549 | be64toh(get_packet_info.offset)); | |
1550 | goto error; | |
d3e2ba59 | 1551 | } |
9a78c92e | 1552 | read_len = lttng_read(vstream->stream_fd->fd, data, len); |
6cd525e8 | 1553 | if (read_len < len) { |
9a78c92e MD |
1554 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, |
1555 | vstream->stream_fd->fd, | |
1556 | be64toh(get_packet_info.offset)); | |
1557 | goto error; | |
d3e2ba59 | 1558 | } |
c4e361a4 | 1559 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
d3e2ba59 JD |
1560 | reply.len = htobe32(len); |
1561 | send_data = 1; | |
1562 | goto send_reply; | |
1563 | ||
1564 | error: | |
c4e361a4 | 1565 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1566 | |
1567 | send_reply: | |
9a78c92e MD |
1568 | if (vstream) { |
1569 | pthread_mutex_unlock(&vstream->stream->lock); | |
1570 | } | |
1571 | send_reply_nolock: | |
d3e2ba59 | 1572 | reply.flags = htobe32(reply.flags); |
eea7556c MD |
1573 | |
1574 | health_code_update(); | |
2f8f53af | 1575 | |
58eb9381 | 1576 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1577 | if (ret < 0) { |
9a78c92e | 1578 | goto end_free; |
d3e2ba59 | 1579 | } |
eea7556c | 1580 | health_code_update(); |
d3e2ba59 JD |
1581 | |
1582 | if (send_data) { | |
eea7556c | 1583 | health_code_update(); |
58eb9381 | 1584 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1585 | if (ret < 0) { |
9a78c92e | 1586 | goto end_free; |
d3e2ba59 | 1587 | } |
eea7556c | 1588 | health_code_update(); |
d3e2ba59 JD |
1589 | } |
1590 | ||
1591 | DBG("Sent %u bytes for stream %" PRIu64, len, | |
1592 | be64toh(get_packet_info.stream_id)); | |
1593 | ||
9a78c92e | 1594 | end_free: |
d3e2ba59 | 1595 | free(data); |
d3e2ba59 | 1596 | end: |
9a78c92e MD |
1597 | if (vstream) { |
1598 | viewer_stream_put(vstream); | |
1599 | } | |
d3e2ba59 JD |
1600 | return ret; |
1601 | } | |
1602 | ||
1603 | /* | |
1604 | * Send the session's metadata | |
1605 | * | |
1606 | * Return 0 on success else a negative value. | |
1607 | */ | |
1608 | static | |
58eb9381 | 1609 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1610 | { |
1611 | int ret = 0; | |
1612 | ssize_t read_len; | |
1613 | uint64_t len = 0; | |
1614 | char *data = NULL; | |
1615 | struct lttng_viewer_get_metadata request; | |
1616 | struct lttng_viewer_metadata_packet reply; | |
9a78c92e | 1617 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 | 1618 | |
58eb9381 | 1619 | assert(conn); |
d3e2ba59 JD |
1620 | |
1621 | DBG("Relay get metadata"); | |
1622 | ||
eea7556c | 1623 | health_code_update(); |
2f8f53af | 1624 | |
58eb9381 | 1625 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1626 | if (ret < 0) { |
d3e2ba59 JD |
1627 | goto end; |
1628 | } | |
eea7556c | 1629 | health_code_update(); |
d3e2ba59 | 1630 | |
53efb85a MD |
1631 | memset(&reply, 0, sizeof(reply)); |
1632 | ||
9a78c92e MD |
1633 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
1634 | if (!vstream) { | |
3271c155 MD |
1635 | /* |
1636 | * The metadata stream can be closed by a CLOSE command | |
1637 | * just before we attach. It can also be closed by | |
1638 | * per-pid tracing during tracing. Therefore, it is | |
1639 | * possible that we cannot find this viewer stream. | |
1640 | * Reply back to the client with an error if we cannot | |
1641 | * find it. | |
1642 | */ | |
1643 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); | |
9a78c92e | 1644 | goto send_reply; |
d3e2ba59 | 1645 | } |
9a78c92e MD |
1646 | pthread_mutex_lock(&vstream->stream->lock); |
1647 | if (!vstream->stream->is_metadata) { | |
1648 | ERR("Invalid metadata stream"); | |
6763619c JD |
1649 | goto error; |
1650 | } | |
1651 | ||
9a78c92e | 1652 | assert(vstream->metadata_sent <= vstream->stream->metadata_received); |
2a174661 | 1653 | |
9a78c92e | 1654 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
d3e2ba59 | 1655 | if (len == 0) { |
c4e361a4 | 1656 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
d3e2ba59 JD |
1657 | goto send_reply; |
1658 | } | |
1659 | ||
1660 | /* first time, we open the metadata file */ | |
9a78c92e | 1661 | if (!vstream->stream_fd) { |
d3e2ba59 JD |
1662 | char fullpath[PATH_MAX]; |
1663 | ||
9a78c92e MD |
1664 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", vstream->path_name, |
1665 | vstream->channel_name); | |
d3e2ba59 JD |
1666 | if (ret < 0) { |
1667 | goto error; | |
1668 | } | |
1669 | ret = open(fullpath, O_RDONLY); | |
1670 | if (ret < 0) { | |
1671 | PERROR("Relay opening metadata file"); | |
1672 | goto error; | |
1673 | } | |
9a78c92e MD |
1674 | vstream->stream_fd = stream_fd_create(ret); |
1675 | if (!vstream->stream_fd) { | |
1676 | if (close(ret)) { | |
1677 | PERROR("close"); | |
1678 | } | |
1679 | goto error; | |
1680 | } | |
d3e2ba59 JD |
1681 | } |
1682 | ||
1683 | reply.len = htobe64(len); | |
1684 | data = zmalloc(len); | |
1685 | if (!data) { | |
1686 | PERROR("viewer metadata zmalloc"); | |
1687 | goto error; | |
1688 | } | |
1689 | ||
9a78c92e | 1690 | read_len = lttng_read(vstream->stream_fd->fd, data, len); |
6cd525e8 | 1691 | if (read_len < len) { |
d3e2ba59 JD |
1692 | PERROR("Relay reading metadata file"); |
1693 | goto error; | |
1694 | } | |
9a78c92e MD |
1695 | vstream->metadata_sent += read_len; |
1696 | if (vstream->metadata_sent == vstream->stream->metadata_received | |
1697 | && vstream->stream->closed) { | |
1698 | /* Release ownership for the viewer metadata stream. */ | |
1699 | viewer_stream_put(vstream); | |
1700 | } | |
1701 | ||
c4e361a4 | 1702 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
9a78c92e | 1703 | |
d3e2ba59 JD |
1704 | goto send_reply; |
1705 | ||
1706 | error: | |
c4e361a4 | 1707 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
1708 | |
1709 | send_reply: | |
eea7556c | 1710 | health_code_update(); |
9a78c92e MD |
1711 | if (vstream) { |
1712 | pthread_mutex_unlock(&vstream->stream->lock); | |
1713 | } | |
58eb9381 | 1714 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1715 | if (ret < 0) { |
9a78c92e | 1716 | goto end_free; |
d3e2ba59 | 1717 | } |
eea7556c | 1718 | health_code_update(); |
d3e2ba59 JD |
1719 | |
1720 | if (len > 0) { | |
58eb9381 | 1721 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1722 | if (ret < 0) { |
9a78c92e | 1723 | goto end_free; |
d3e2ba59 JD |
1724 | } |
1725 | } | |
1726 | ||
1727 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
1728 | be64toh(request.stream_id)); | |
1729 | ||
1730 | DBG("Metadata sent"); | |
1731 | ||
9a78c92e | 1732 | end_free: |
d3e2ba59 | 1733 | free(data); |
d3e2ba59 | 1734 | end: |
9a78c92e MD |
1735 | if (vstream) { |
1736 | viewer_stream_put(vstream); | |
1737 | } | |
d3e2ba59 JD |
1738 | return ret; |
1739 | } | |
1740 | ||
c3b7390b JD |
1741 | /* |
1742 | * Create a viewer session. | |
1743 | * | |
1744 | * Return 0 on success or else a negative value. | |
1745 | */ | |
1746 | static | |
1747 | int viewer_create_session(struct relay_connection *conn) | |
1748 | { | |
1749 | int ret; | |
1750 | struct lttng_viewer_create_session_response resp; | |
1751 | ||
1752 | DBG("Viewer create session received"); | |
1753 | ||
53efb85a | 1754 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 1755 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
9a78c92e | 1756 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
1757 | if (!conn->viewer_session) { |
1758 | ERR("Allocation viewer session"); | |
1759 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
1760 | goto send_reply; | |
1761 | } | |
c3b7390b JD |
1762 | |
1763 | send_reply: | |
1764 | health_code_update(); | |
1765 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
1766 | if (ret < 0) { | |
1767 | goto end; | |
1768 | } | |
1769 | health_code_update(); | |
1770 | ret = 0; | |
1771 | ||
1772 | end: | |
1773 | return ret; | |
1774 | } | |
1775 | ||
1776 | ||
d3e2ba59 JD |
1777 | /* |
1778 | * live_relay_unknown_command: send -1 if received unknown command | |
1779 | */ | |
1780 | static | |
58eb9381 | 1781 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
1782 | { |
1783 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 1784 | |
53efb85a | 1785 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 1786 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 1787 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
1788 | } |
1789 | ||
1790 | /* | |
1791 | * Process the commands received on the control socket | |
1792 | */ | |
1793 | static | |
1794 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 1795 | struct relay_connection *conn) |
d3e2ba59 JD |
1796 | { |
1797 | int ret = 0; | |
2f8f53af DG |
1798 | uint32_t msg_value; |
1799 | ||
2f8f53af DG |
1800 | msg_value = be32toh(recv_hdr->cmd); |
1801 | ||
1802 | /* | |
1803 | * Make sure we've done the version check before any command other then a | |
1804 | * new client connection. | |
1805 | */ | |
c4e361a4 | 1806 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 1807 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
1808 | ret = -1; |
1809 | goto end; | |
1810 | } | |
d3e2ba59 | 1811 | |
2f8f53af | 1812 | switch (msg_value) { |
c4e361a4 | 1813 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 1814 | ret = viewer_connect(conn); |
d3e2ba59 | 1815 | break; |
c4e361a4 | 1816 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 1817 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 1818 | break; |
c4e361a4 | 1819 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 1820 | ret = viewer_attach_session(conn); |
d3e2ba59 | 1821 | break; |
c4e361a4 | 1822 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 1823 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 1824 | break; |
c4e361a4 | 1825 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 1826 | ret = viewer_get_packet(conn); |
d3e2ba59 | 1827 | break; |
c4e361a4 | 1828 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 1829 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 1830 | break; |
c4e361a4 | 1831 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 1832 | ret = viewer_get_new_streams(conn); |
80e8027a | 1833 | break; |
c3b7390b JD |
1834 | case LTTNG_VIEWER_CREATE_SESSION: |
1835 | ret = viewer_create_session(conn); | |
1836 | break; | |
d3e2ba59 | 1837 | default: |
9a78c92e MD |
1838 | ERR("Received unknown viewer command (%u)", |
1839 | be32toh(recv_hdr->cmd)); | |
58eb9381 | 1840 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
1841 | ret = -1; |
1842 | goto end; | |
1843 | } | |
1844 | ||
1845 | end: | |
1846 | return ret; | |
1847 | } | |
1848 | ||
1849 | static | |
58eb9381 | 1850 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
1851 | { |
1852 | int ret; | |
1853 | ||
58eb9381 | 1854 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 JD |
1855 | |
1856 | ret = close(pollfd); | |
1857 | if (ret < 0) { | |
1858 | ERR("Closing pollfd %d", pollfd); | |
1859 | } | |
1860 | } | |
1861 | ||
d3e2ba59 JD |
1862 | /* |
1863 | * This thread does the actual work | |
1864 | */ | |
1865 | static | |
1866 | void *thread_worker(void *data) | |
1867 | { | |
1868 | int ret, err = -1; | |
1869 | uint32_t nb_fd; | |
d3e2ba59 | 1870 | struct lttng_poll_event events; |
9a78c92e | 1871 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 JD |
1872 | struct lttng_ht_iter iter; |
1873 | struct lttng_viewer_cmd recv_hdr; | |
f89048c1 | 1874 | struct relay_connection *destroy_conn; |
d3e2ba59 JD |
1875 | |
1876 | DBG("[thread] Live viewer relay worker started"); | |
1877 | ||
1878 | rcu_register_thread(); | |
1879 | ||
eea7556c MD |
1880 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
1881 | ||
9b5e0863 MD |
1882 | if (testpoint(relayd_thread_live_worker)) { |
1883 | goto error_testpoint; | |
1884 | } | |
1885 | ||
d3e2ba59 | 1886 | /* table of connections indexed on socket */ |
9a78c92e MD |
1887 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1888 | if (!viewer_connections_ht) { | |
1889 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
1890 | } |
1891 | ||
1892 | ret = create_thread_poll_set(&events, 2); | |
1893 | if (ret < 0) { | |
1894 | goto error_poll_create; | |
1895 | } | |
1896 | ||
58eb9381 | 1897 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
1898 | if (ret < 0) { |
1899 | goto error; | |
1900 | } | |
1901 | ||
1902 | restart: | |
1903 | while (1) { | |
1904 | int i; | |
1905 | ||
eea7556c MD |
1906 | health_code_update(); |
1907 | ||
d3e2ba59 JD |
1908 | /* Infinite blocking call, waiting for transmission */ |
1909 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 1910 | health_poll_entry(); |
d3e2ba59 | 1911 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 1912 | health_poll_exit(); |
d3e2ba59 JD |
1913 | if (ret < 0) { |
1914 | /* | |
1915 | * Restart interrupted system call. | |
1916 | */ | |
1917 | if (errno == EINTR) { | |
1918 | goto restart; | |
1919 | } | |
1920 | goto error; | |
1921 | } | |
1922 | ||
1923 | nb_fd = ret; | |
1924 | ||
1925 | /* | |
1926 | * Process control. The control connection is prioritised so we don't | |
1927 | * starve it with high throughput tracing data on the data | |
1928 | * connection. | |
1929 | */ | |
1930 | for (i = 0; i < nb_fd; i++) { | |
1931 | /* Fetch once the poll data */ | |
1932 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1933 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1934 | ||
eea7556c MD |
1935 | health_code_update(); |
1936 | ||
e0077699 MD |
1937 | if (!revents) { |
1938 | /* No activity for this FD (poll implementation). */ | |
1939 | continue; | |
1940 | } | |
1941 | ||
d3e2ba59 | 1942 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 1943 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
1944 | if (ret) { |
1945 | err = 0; | |
1946 | goto exit; | |
1947 | } | |
1948 | ||
9a78c92e | 1949 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 1950 | if (pollfd == live_conn_pipe[0]) { |
d3e2ba59 JD |
1951 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1952 | ERR("Relay live pipe error"); | |
1953 | goto error; | |
1954 | } else if (revents & LPOLLIN) { | |
f89048c1 JG |
1955 | struct relay_connection *conn; |
1956 | ||
9a78c92e MD |
1957 | ret = lttng_read(live_conn_pipe[0], |
1958 | &conn, sizeof(conn)); | |
d3e2ba59 JD |
1959 | if (ret < 0) { |
1960 | goto error; | |
1961 | } | |
58eb9381 DG |
1962 | lttng_poll_add(&events, conn->sock->fd, |
1963 | LPOLLIN | LPOLLRDHUP); | |
9a78c92e MD |
1964 | connection_ht_add(viewer_connections_ht, conn); |
1965 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
d3e2ba59 | 1966 | } |
58eb9381 | 1967 | } else { |
9a78c92e | 1968 | /* Connection activity. */ |
f89048c1 JG |
1969 | struct relay_connection *conn; |
1970 | ||
9a78c92e MD |
1971 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
1972 | if (!conn) { | |
1973 | continue; | |
1974 | } | |
58eb9381 DG |
1975 | |
1976 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1977 | cleanup_connection_pollfd(&events, pollfd); | |
9a78c92e MD |
1978 | /* Put "create" ownership reference. */ |
1979 | connection_put(conn); | |
d3e2ba59 | 1980 | } else if (revents & LPOLLIN) { |
58eb9381 DG |
1981 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
1982 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 1983 | if (ret <= 0) { |
9a78c92e | 1984 | /* Connection closed. */ |
58eb9381 | 1985 | cleanup_connection_pollfd(&events, pollfd); |
9a78c92e MD |
1986 | /* Put "create" ownership reference. */ |
1987 | connection_put(conn); | |
58eb9381 | 1988 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 1989 | } else { |
58eb9381 | 1990 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
1991 | if (ret < 0) { |
1992 | /* Clear the session on error. */ | |
58eb9381 | 1993 | cleanup_connection_pollfd(&events, pollfd); |
9a78c92e MD |
1994 | /* Put "create" ownership reference. */ |
1995 | connection_put(conn); | |
d3e2ba59 JD |
1996 | DBG("Viewer connection closed with %d", pollfd); |
1997 | } | |
1998 | } | |
1999 | } | |
9a78c92e MD |
2000 | /* Put local "get_by_sock" reference. */ |
2001 | connection_put(conn); | |
d3e2ba59 JD |
2002 | } |
2003 | } | |
2004 | } | |
2005 | ||
2006 | exit: | |
2007 | error: | |
2008 | lttng_poll_clean(&events); | |
2009 | ||
58eb9381 | 2010 | /* Cleanup reamaining connection object. */ |
d3e2ba59 | 2011 | rcu_read_lock(); |
9a78c92e | 2012 | cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter, |
f89048c1 | 2013 | destroy_conn, |
58eb9381 | 2014 | sock_n.node) { |
eea7556c | 2015 | health_code_update(); |
9a78c92e | 2016 | connection_put(destroy_conn); |
d3e2ba59 JD |
2017 | } |
2018 | rcu_read_unlock(); | |
2019 | error_poll_create: | |
9a78c92e MD |
2020 | lttng_ht_destroy(viewer_connections_ht); |
2021 | viewer_connections_ht_error: | |
58eb9381 DG |
2022 | /* Close relay conn pipes */ |
2023 | utils_close_pipe(live_conn_pipe); | |
d3e2ba59 JD |
2024 | if (err) { |
2025 | DBG("Viewer worker thread exited with error"); | |
2026 | } | |
2027 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2028 | error_testpoint: |
eea7556c MD |
2029 | if (err) { |
2030 | health_error(); | |
2031 | ERR("Health error occurred in %s", __func__); | |
2032 | } | |
2033 | health_unregister(health_relayd); | |
770f96f4 MD |
2034 | if (lttng_relay_stop_threads()) { |
2035 | ERR("Error stopping threads"); | |
77c54fed | 2036 | } |
d3e2ba59 JD |
2037 | rcu_unregister_thread(); |
2038 | return NULL; | |
2039 | } | |
2040 | ||
2041 | /* | |
2042 | * Create the relay command pipe to wake thread_manage_apps. | |
2043 | * Closed in cleanup(). | |
2044 | */ | |
58eb9381 | 2045 | static int create_conn_pipe(void) |
d3e2ba59 | 2046 | { |
77c54fed MD |
2047 | return utils_create_pipe_cloexec(live_conn_pipe); |
2048 | } | |
d3e2ba59 | 2049 | |
77c54fed | 2050 | int relayd_live_join(void) |
d3e2ba59 | 2051 | { |
77c54fed | 2052 | int ret, retval = 0; |
d3e2ba59 JD |
2053 | void *status; |
2054 | ||
d3e2ba59 | 2055 | ret = pthread_join(live_listener_thread, &status); |
77c54fed MD |
2056 | if (ret) { |
2057 | errno = ret; | |
d3e2ba59 | 2058 | PERROR("pthread_join live listener"); |
77c54fed | 2059 | retval = -1; |
d3e2ba59 JD |
2060 | } |
2061 | ||
2062 | ret = pthread_join(live_worker_thread, &status); | |
77c54fed MD |
2063 | if (ret) { |
2064 | errno = ret; | |
d3e2ba59 | 2065 | PERROR("pthread_join live worker"); |
77c54fed | 2066 | retval = -1; |
d3e2ba59 JD |
2067 | } |
2068 | ||
2069 | ret = pthread_join(live_dispatcher_thread, &status); | |
77c54fed MD |
2070 | if (ret) { |
2071 | errno = ret; | |
d3e2ba59 | 2072 | PERROR("pthread_join live dispatcher"); |
77c54fed | 2073 | retval = -1; |
d3e2ba59 JD |
2074 | } |
2075 | ||
77c54fed | 2076 | cleanup_relayd_live(); |
d3e2ba59 | 2077 | |
77c54fed | 2078 | return retval; |
d3e2ba59 JD |
2079 | } |
2080 | ||
2081 | /* | |
2082 | * main | |
2083 | */ | |
9a78c92e | 2084 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2085 | { |
77c54fed | 2086 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2087 | void *status; |
2088 | int is_root; | |
2089 | ||
77c54fed MD |
2090 | if (!uri) { |
2091 | retval = -1; | |
2092 | goto exit_init_data; | |
2093 | } | |
d3e2ba59 JD |
2094 | live_uri = uri; |
2095 | ||
d3e2ba59 JD |
2096 | /* Check if daemon is UID = 0 */ |
2097 | is_root = !getuid(); | |
2098 | ||
2099 | if (!is_root) { | |
2100 | if (live_uri->port < 1024) { | |
2101 | ERR("Need to be root to use ports < 1024"); | |
77c54fed MD |
2102 | retval = -1; |
2103 | goto exit_init_data; | |
d3e2ba59 JD |
2104 | } |
2105 | } | |
2106 | ||
2107 | /* Setup the thread apps communication pipe. */ | |
77c54fed MD |
2108 | if (create_conn_pipe()) { |
2109 | retval = -1; | |
2110 | goto exit_init_data; | |
d3e2ba59 JD |
2111 | } |
2112 | ||
2113 | /* Init relay command queue. */ | |
8bdee6e2 | 2114 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2115 | |
2116 | /* Set up max poll set size */ | |
2117 | lttng_poll_set_max_size(); | |
2118 | ||
2119 | /* Setup the dispatcher thread */ | |
2120 | ret = pthread_create(&live_dispatcher_thread, NULL, | |
2121 | thread_dispatcher, (void *) NULL); | |
77c54fed MD |
2122 | if (ret) { |
2123 | errno = ret; | |
d3e2ba59 | 2124 | PERROR("pthread_create viewer dispatcher"); |
77c54fed 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, | |
9a78c92e | 2131 | thread_worker, NULL); |
77c54fed MD |
2132 | if (ret) { |
2133 | errno = ret; | |
d3e2ba59 | 2134 | PERROR("pthread_create viewer worker"); |
77c54fed 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); | |
77c54fed MD |
2142 | if (ret) { |
2143 | errno = ret; | |
d3e2ba59 | 2144 | PERROR("pthread_create viewer listener"); |
77c54fed MD |
2145 | retval = -1; |
2146 | goto exit_listener_thread; | |
d3e2ba59 JD |
2147 | } |
2148 | ||
77c54fed MD |
2149 | /* |
2150 | * All OK, started all threads. | |
2151 | */ | |
2152 | return retval; | |
2153 | ||
bafd3fc0 JG |
2154 | /* |
2155 | * Join on the live_listener_thread should anything be added after | |
2156 | * the live_listener thread's creation. | |
2157 | */ | |
d3e2ba59 | 2158 | |
77c54fed | 2159 | exit_listener_thread: |
d3e2ba59 | 2160 | |
d3e2ba59 | 2161 | ret = pthread_join(live_worker_thread, &status); |
77c54fed MD |
2162 | if (ret) { |
2163 | errno = ret; | |
d3e2ba59 | 2164 | PERROR("pthread_join live worker"); |
77c54fed | 2165 | retval = -1; |
d3e2ba59 | 2166 | } |
77c54fed | 2167 | exit_worker_thread: |
d3e2ba59 | 2168 | |
d3e2ba59 | 2169 | ret = pthread_join(live_dispatcher_thread, &status); |
77c54fed MD |
2170 | if (ret) { |
2171 | errno = ret; | |
d3e2ba59 | 2172 | PERROR("pthread_join live dispatcher"); |
77c54fed | 2173 | retval = -1; |
d3e2ba59 | 2174 | } |
77c54fed | 2175 | exit_dispatcher_thread: |
d3e2ba59 | 2176 | |
77c54fed MD |
2177 | exit_init_data: |
2178 | cleanup_relayd_live(); | |
d3e2ba59 | 2179 | |
77c54fed | 2180 | return retval; |
d3e2ba59 | 2181 | } |