Commit | Line | Data |
---|---|---|
d3e2ba59 JD |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
5a693d30 | 4 | * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
d3e2ba59 JD |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License, version 2 only, | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
20 | #define _GNU_SOURCE | |
6c1c0768 | 21 | #define _LGPL_SOURCE |
d3e2ba59 JD |
22 | #include <getopt.h> |
23 | #include <grp.h> | |
24 | #include <limits.h> | |
25 | #include <pthread.h> | |
26 | #include <signal.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
30 | #include <sys/mman.h> | |
31 | #include <sys/mount.h> | |
32 | #include <sys/resource.h> | |
33 | #include <sys/socket.h> | |
34 | #include <sys/stat.h> | |
35 | #include <sys/types.h> | |
36 | #include <sys/wait.h> | |
37 | #include <inttypes.h> | |
38 | #include <urcu/futex.h> | |
39 | #include <urcu/uatomic.h> | |
5a693d30 | 40 | #include <urcu/rculist.h> |
d3e2ba59 JD |
41 | #include <unistd.h> |
42 | #include <fcntl.h> | |
43 | #include <config.h> | |
44 | ||
45 | #include <lttng/lttng.h> | |
46 | #include <common/common.h> | |
47 | #include <common/compat/poll.h> | |
48 | #include <common/compat/socket.h> | |
f263b7fd | 49 | #include <common/compat/endian.h> |
d3e2ba59 JD |
50 | #include <common/defaults.h> |
51 | #include <common/futex.h> | |
2f8f53af | 52 | #include <common/index/index.h> |
d3e2ba59 JD |
53 | #include <common/sessiond-comm/sessiond-comm.h> |
54 | #include <common/sessiond-comm/inet.h> | |
55 | #include <common/sessiond-comm/relayd.h> | |
56 | #include <common/uri.h> | |
57 | #include <common/utils.h> | |
58 | ||
59 | #include "cmd.h" | |
60 | #include "live.h" | |
61 | #include "lttng-relayd.h" | |
d3e2ba59 | 62 | #include "utils.h" |
eea7556c | 63 | #include "health-relayd.h" |
9b5e0863 | 64 | #include "testpoint.h" |
2f8f53af | 65 | #include "viewer-stream.h" |
2a174661 DG |
66 | #include "stream.h" |
67 | #include "session.h" | |
68 | #include "ctf-trace.h" | |
58eb9381 | 69 | #include "connection.h" |
5a693d30 MD |
70 | #include "viewer-session.h" |
71 | ||
72 | #define SESSION_BUF_DEFAULT_COUNT 16 | |
d3e2ba59 JD |
73 | |
74 | static struct lttng_uri *live_uri; | |
75 | ||
d3e2ba59 JD |
76 | /* |
77 | * This pipe is used to inform the worker thread that a command is queued and | |
78 | * ready to be processed. | |
79 | */ | |
58eb9381 | 80 | static int live_conn_pipe[2] = { -1, -1 }; |
d3e2ba59 JD |
81 | |
82 | /* Shared between threads */ | |
83 | static int live_dispatch_thread_exit; | |
84 | ||
85 | static pthread_t live_listener_thread; | |
86 | static pthread_t live_dispatcher_thread; | |
87 | static pthread_t live_worker_thread; | |
88 | ||
89 | /* | |
90 | * Relay command queue. | |
91 | * | |
92 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
93 | * queue. | |
94 | */ | |
58eb9381 | 95 | static struct relay_conn_queue viewer_conn_queue; |
d3e2ba59 JD |
96 | |
97 | static uint64_t last_relay_viewer_session_id; | |
5a693d30 MD |
98 | static pthread_mutex_t last_relay_viewer_session_id_lock = |
99 | PTHREAD_MUTEX_INITIALIZER; | |
d3e2ba59 JD |
100 | |
101 | /* | |
102 | * Cleanup the daemon | |
103 | */ | |
104 | static | |
178a0557 | 105 | void cleanup_relayd_live(void) |
d3e2ba59 JD |
106 | { |
107 | DBG("Cleaning up"); | |
108 | ||
d3e2ba59 JD |
109 | free(live_uri); |
110 | } | |
111 | ||
2f8f53af DG |
112 | /* |
113 | * Receive a request buffer using a given socket, destination allocated buffer | |
114 | * of length size. | |
115 | * | |
116 | * Return the size of the received message or else a negative value on error | |
117 | * with errno being set by recvmsg() syscall. | |
118 | */ | |
119 | static | |
120 | ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size) | |
121 | { | |
122 | ssize_t ret; | |
123 | ||
2f8f53af DG |
124 | ret = sock->ops->recvmsg(sock, buf, size, 0); |
125 | if (ret < 0 || ret != size) { | |
126 | if (ret == 0) { | |
127 | /* Orderly shutdown. Not necessary to print an error. */ | |
128 | DBG("Socket %d did an orderly shutdown", sock->fd); | |
129 | } else { | |
130 | ERR("Relay failed to receive request."); | |
131 | } | |
132 | ret = -1; | |
133 | } | |
134 | ||
135 | return ret; | |
136 | } | |
137 | ||
138 | /* | |
139 | * Send a response buffer using a given socket, source allocated buffer of | |
140 | * length size. | |
141 | * | |
142 | * Return the size of the sent message or else a negative value on error with | |
143 | * errno being set by sendmsg() syscall. | |
144 | */ | |
145 | static | |
146 | ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size) | |
147 | { | |
148 | ssize_t ret; | |
149 | ||
2f8f53af DG |
150 | ret = sock->ops->sendmsg(sock, buf, size, 0); |
151 | if (ret < 0) { | |
152 | ERR("Relayd failed to send response."); | |
153 | } | |
154 | ||
155 | return ret; | |
156 | } | |
157 | ||
158 | /* | |
f04a971b JD |
159 | * Atomically check if new streams got added in one of the sessions attached |
160 | * and reset the flag to 0. | |
2f8f53af DG |
161 | * |
162 | * Returns 1 if new streams got added, 0 if nothing changed, a negative value | |
163 | * on error. | |
164 | */ | |
165 | static | |
f04a971b | 166 | int check_new_streams(struct relay_connection *conn) |
2f8f53af | 167 | { |
2f8f53af | 168 | struct relay_session *session; |
f04a971b JD |
169 | unsigned long current_val; |
170 | int ret = 0; | |
2f8f53af | 171 | |
f04a971b JD |
172 | if (!conn->viewer_session) { |
173 | goto end; | |
174 | } | |
5a693d30 MD |
175 | rcu_read_lock(); |
176 | cds_list_for_each_entry_rcu(session, | |
177 | &conn->viewer_session->session_list, | |
178 | viewer_session_node) { | |
179 | if (!session_get(session)) { | |
180 | continue; | |
181 | } | |
f04a971b JD |
182 | current_val = uatomic_cmpxchg(&session->new_streams, 1, 0); |
183 | ret = current_val; | |
5a693d30 | 184 | session_put(session); |
f04a971b JD |
185 | if (ret == 1) { |
186 | goto end; | |
187 | } | |
2f8f53af | 188 | } |
f04a971b | 189 | end: |
5a693d30 | 190 | rcu_read_unlock(); |
2f8f53af DG |
191 | return ret; |
192 | } | |
193 | ||
194 | /* | |
195 | * Send viewer streams to the given socket. The ignore_sent_flag indicates if | |
196 | * this function should ignore the sent flag or not. | |
197 | * | |
198 | * Return 0 on success or else a negative value. | |
199 | */ | |
200 | static | |
201 | ssize_t send_viewer_streams(struct lttcomm_sock *sock, | |
202 | struct relay_session *session, unsigned int ignore_sent_flag) | |
203 | { | |
204 | ssize_t ret; | |
205 | struct lttng_viewer_stream send_stream; | |
206 | struct lttng_ht_iter iter; | |
207 | struct relay_viewer_stream *vstream; | |
208 | ||
2f8f53af DG |
209 | rcu_read_lock(); |
210 | ||
211 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream, | |
212 | stream_n.node) { | |
2a174661 DG |
213 | struct ctf_trace *ctf_trace; |
214 | ||
2f8f53af DG |
215 | health_code_update(); |
216 | ||
5a693d30 MD |
217 | if (!viewer_stream_get(vstream)) { |
218 | continue; | |
219 | } | |
220 | ||
221 | pthread_mutex_lock(&vstream->stream->lock); | |
2f8f53af | 222 | /* Ignore if not the same session. */ |
5a693d30 | 223 | if (vstream->stream->trace->session->id != session->id || |
2f8f53af | 224 | (!ignore_sent_flag && vstream->sent_flag)) { |
5a693d30 MD |
225 | pthread_mutex_unlock(&vstream->stream->lock); |
226 | viewer_stream_put(vstream); | |
2f8f53af DG |
227 | continue; |
228 | } | |
229 | ||
5a693d30 MD |
230 | ctf_trace = vstream->stream->trace; |
231 | send_stream.id = htobe64(vstream->stream->stream_handle); | |
2a174661 | 232 | send_stream.ctf_trace_id = htobe64(ctf_trace->id); |
5a693d30 MD |
233 | send_stream.metadata_flag = htobe32( |
234 | vstream->stream->is_metadata); | |
2f8f53af DG |
235 | strncpy(send_stream.path_name, vstream->path_name, |
236 | sizeof(send_stream.path_name)); | |
237 | strncpy(send_stream.channel_name, vstream->channel_name, | |
238 | sizeof(send_stream.channel_name)); | |
239 | ||
5a693d30 MD |
240 | DBG("Sending stream %" PRIu64 " to viewer", |
241 | vstream->stream->stream_handle); | |
242 | vstream->sent_flag = 1; | |
243 | pthread_mutex_unlock(&vstream->stream->lock); | |
244 | ||
2f8f53af | 245 | ret = send_response(sock, &send_stream, sizeof(send_stream)); |
5a693d30 | 246 | viewer_stream_put(vstream); |
2f8f53af DG |
247 | if (ret < 0) { |
248 | goto end_unlock; | |
249 | } | |
2f8f53af DG |
250 | } |
251 | ||
252 | ret = 0; | |
253 | ||
254 | end_unlock: | |
255 | rcu_read_unlock(); | |
256 | return ret; | |
257 | } | |
258 | ||
259 | /* | |
260 | * Create every viewer stream possible for the given session with the seek | |
261 | * type. Three counters *can* be return which are in order the total amount of | |
262 | * viewer stream of the session, the number of unsent stream and the number of | |
263 | * stream created. Those counters can be NULL and thus will be ignored. | |
264 | * | |
265 | * Return 0 on success or else a negative value. | |
266 | */ | |
267 | static | |
268 | int make_viewer_streams(struct relay_session *session, | |
269 | enum lttng_viewer_seek seek_t, uint32_t *nb_total, uint32_t *nb_unsent, | |
47d9f81a | 270 | uint32_t *nb_created, bool *closed) |
2f8f53af DG |
271 | { |
272 | int ret; | |
2f8f53af | 273 | struct lttng_ht_iter iter; |
2a174661 | 274 | struct ctf_trace *ctf_trace; |
2f8f53af DG |
275 | |
276 | assert(session); | |
277 | ||
278 | /* | |
5a693d30 MD |
279 | * Hold the session lock to ensure that we see either none or |
280 | * all initial streams for a session, but no intermediate state. | |
2f8f53af | 281 | */ |
5a693d30 | 282 | pthread_mutex_lock(&session->lock); |
2f8f53af | 283 | |
47d9f81a MD |
284 | if (session->connection_closed) { |
285 | *closed = true; | |
286 | } | |
287 | ||
2f8f53af | 288 | /* |
5a693d30 MD |
289 | * Create viewer streams for relay streams that are ready to be |
290 | * used for a the given session id only. | |
2f8f53af | 291 | */ |
2a174661 DG |
292 | rcu_read_lock(); |
293 | cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace, | |
294 | node.node) { | |
295 | struct relay_stream *stream; | |
2f8f53af DG |
296 | |
297 | health_code_update(); | |
298 | ||
5a693d30 | 299 | if (!ctf_trace_get(ctf_trace)) { |
2f8f53af DG |
300 | continue; |
301 | } | |
302 | ||
5a693d30 | 303 | cds_list_for_each_entry_rcu(stream, &ctf_trace->stream_list, stream_node) { |
2a174661 DG |
304 | struct relay_viewer_stream *vstream; |
305 | ||
5a693d30 | 306 | if (!stream_get(stream)) { |
2a174661 DG |
307 | continue; |
308 | } | |
5a693d30 MD |
309 | /* |
310 | * stream published is protected by the session | |
311 | * lock. | |
312 | */ | |
313 | if (!stream->published) { | |
314 | goto next; | |
315 | } | |
316 | vstream = viewer_stream_get_by_id(stream->stream_handle); | |
2f8f53af | 317 | if (!vstream) { |
5a693d30 | 318 | vstream = viewer_stream_create(stream, seek_t); |
2a174661 DG |
319 | if (!vstream) { |
320 | ret = -1; | |
5a693d30 MD |
321 | ctf_trace_put(ctf_trace); |
322 | stream_put(stream); | |
2a174661 DG |
323 | goto error_unlock; |
324 | } | |
2a174661 DG |
325 | |
326 | if (nb_created) { | |
327 | /* Update number of created stream counter. */ | |
328 | (*nb_created)++; | |
329 | } | |
8cd956bc MD |
330 | /* |
331 | * Ensure a self-reference is preserved even | |
332 | * after we have put our local reference. | |
333 | */ | |
334 | viewer_stream_get(vstream); | |
5a693d30 MD |
335 | } else { |
336 | if (!vstream->sent_flag && nb_unsent) { | |
337 | /* Update number of unsent stream counter. */ | |
338 | (*nb_unsent)++; | |
339 | } | |
2f8f53af | 340 | } |
2a174661 DG |
341 | /* Update number of total stream counter. */ |
342 | if (nb_total) { | |
8cd956bc MD |
343 | if (stream->is_metadata) { |
344 | if (!stream->closed || | |
345 | stream->metadata_received > vstream->metadata_sent) { | |
346 | (*nb_total)++; | |
347 | } | |
348 | } else { | |
349 | if (!stream->closed || | |
350 | !(((int64_t) (stream->prev_seq - stream->last_net_seq_num)) >= 0)) { | |
351 | ||
352 | (*nb_total)++; | |
353 | } | |
354 | } | |
2f8f53af | 355 | } |
8cd956bc MD |
356 | /* Put local reference. */ |
357 | viewer_stream_put(vstream); | |
5a693d30 MD |
358 | next: |
359 | stream_put(stream); | |
2f8f53af | 360 | } |
5a693d30 | 361 | ctf_trace_put(ctf_trace); |
2f8f53af DG |
362 | } |
363 | ||
364 | ret = 0; | |
365 | ||
366 | error_unlock: | |
2a174661 | 367 | rcu_read_unlock(); |
5a693d30 | 368 | pthread_mutex_unlock(&session->lock); |
2f8f53af DG |
369 | return ret; |
370 | } | |
371 | ||
b4aacfdc | 372 | int relayd_live_stop(void) |
d3e2ba59 | 373 | { |
b4aacfdc | 374 | /* Stop dispatch thread */ |
d3e2ba59 | 375 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); |
58eb9381 | 376 | futex_nto1_wake(&viewer_conn_queue.futex); |
b4aacfdc | 377 | return 0; |
d3e2ba59 JD |
378 | } |
379 | ||
d3e2ba59 JD |
380 | /* |
381 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
382 | */ | |
383 | static | |
384 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
385 | { | |
386 | int ret; | |
387 | ||
388 | if (events == NULL || size == 0) { | |
389 | ret = -1; | |
390 | goto error; | |
391 | } | |
392 | ||
393 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
394 | if (ret < 0) { | |
395 | goto error; | |
396 | } | |
397 | ||
398 | /* Add quit pipe */ | |
bcf4a440 | 399 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
d3e2ba59 JD |
400 | if (ret < 0) { |
401 | goto error; | |
402 | } | |
403 | ||
404 | return 0; | |
405 | ||
406 | error: | |
407 | return ret; | |
408 | } | |
409 | ||
410 | /* | |
411 | * Check if the thread quit pipe was triggered. | |
412 | * | |
413 | * Return 1 if it was triggered else 0; | |
414 | */ | |
415 | static | |
bcf4a440 | 416 | int check_thread_quit_pipe(int fd, uint32_t events) |
d3e2ba59 | 417 | { |
bcf4a440 | 418 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
d3e2ba59 JD |
419 | return 1; |
420 | } | |
421 | ||
422 | return 0; | |
423 | } | |
424 | ||
425 | /* | |
426 | * Create and init socket from uri. | |
427 | */ | |
428 | static | |
429 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
430 | { | |
431 | int ret; | |
432 | struct lttcomm_sock *sock = NULL; | |
433 | ||
434 | sock = lttcomm_alloc_sock_from_uri(uri); | |
435 | if (sock == NULL) { | |
436 | ERR("Allocating socket"); | |
437 | goto error; | |
438 | } | |
439 | ||
440 | ret = lttcomm_create_sock(sock); | |
441 | if (ret < 0) { | |
442 | goto error; | |
443 | } | |
444 | DBG("Listening on sock %d for live", sock->fd); | |
445 | ||
446 | ret = sock->ops->bind(sock); | |
447 | if (ret < 0) { | |
448 | goto error; | |
449 | } | |
450 | ||
451 | ret = sock->ops->listen(sock, -1); | |
452 | if (ret < 0) { | |
453 | goto error; | |
454 | ||
455 | } | |
456 | ||
457 | return sock; | |
458 | ||
459 | error: | |
460 | if (sock) { | |
461 | lttcomm_destroy_sock(sock); | |
462 | } | |
463 | return NULL; | |
464 | } | |
465 | ||
466 | /* | |
467 | * This thread manages the listening for new connections on the network | |
468 | */ | |
469 | static | |
470 | void *thread_listener(void *data) | |
471 | { | |
472 | int i, ret, pollfd, err = -1; | |
d3e2ba59 JD |
473 | uint32_t revents, nb_fd; |
474 | struct lttng_poll_event events; | |
475 | struct lttcomm_sock *live_control_sock; | |
476 | ||
477 | DBG("[thread] Relay live listener started"); | |
478 | ||
eea7556c MD |
479 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
480 | ||
481 | health_code_update(); | |
482 | ||
d3e2ba59 JD |
483 | live_control_sock = init_socket(live_uri); |
484 | if (!live_control_sock) { | |
485 | goto error_sock_control; | |
486 | } | |
487 | ||
fb4d42ab | 488 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
d3e2ba59 JD |
489 | ret = create_thread_poll_set(&events, 2); |
490 | if (ret < 0) { | |
491 | goto error_create_poll; | |
492 | } | |
493 | ||
494 | /* Add the control socket */ | |
495 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
496 | if (ret < 0) { | |
497 | goto error_poll_add; | |
498 | } | |
499 | ||
3fd27398 MD |
500 | lttng_relay_notify_ready(); |
501 | ||
9b5e0863 MD |
502 | if (testpoint(relayd_thread_live_listener)) { |
503 | goto error_testpoint; | |
504 | } | |
505 | ||
d3e2ba59 | 506 | while (1) { |
eea7556c MD |
507 | health_code_update(); |
508 | ||
d3e2ba59 JD |
509 | DBG("Listener accepting live viewers connections"); |
510 | ||
511 | restart: | |
eea7556c | 512 | health_poll_entry(); |
d3e2ba59 | 513 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 514 | health_poll_exit(); |
d3e2ba59 JD |
515 | if (ret < 0) { |
516 | /* | |
517 | * Restart interrupted system call. | |
518 | */ | |
519 | if (errno == EINTR) { | |
520 | goto restart; | |
521 | } | |
522 | goto error; | |
523 | } | |
524 | nb_fd = ret; | |
525 | ||
526 | DBG("Relay new viewer connection received"); | |
527 | for (i = 0; i < nb_fd; i++) { | |
eea7556c MD |
528 | health_code_update(); |
529 | ||
d3e2ba59 JD |
530 | /* Fetch once the poll data */ |
531 | revents = LTTNG_POLL_GETEV(&events, i); | |
532 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
533 | ||
fd20dac9 MD |
534 | if (!revents) { |
535 | /* No activity for this FD (poll implementation). */ | |
536 | continue; | |
537 | } | |
538 | ||
d3e2ba59 | 539 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 540 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
541 | if (ret) { |
542 | err = 0; | |
543 | goto exit; | |
544 | } | |
545 | ||
546 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
547 | ERR("socket poll error"); | |
548 | goto error; | |
549 | } else if (revents & LPOLLIN) { | |
550 | /* | |
5a693d30 MD |
551 | * A new connection is requested, therefore a |
552 | * viewer connection is allocated in this | |
553 | * thread, enqueued to a global queue and | |
554 | * dequeued (and freed) in the worker thread. | |
d3e2ba59 | 555 | */ |
58eb9381 DG |
556 | int val = 1; |
557 | struct relay_connection *new_conn; | |
d3e2ba59 JD |
558 | struct lttcomm_sock *newsock; |
559 | ||
d3e2ba59 JD |
560 | newsock = live_control_sock->ops->accept(live_control_sock); |
561 | if (!newsock) { | |
562 | PERROR("accepting control sock"); | |
d3e2ba59 JD |
563 | goto error; |
564 | } | |
565 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
58eb9381 | 566 | |
d3e2ba59 | 567 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
58eb9381 | 568 | sizeof(val)); |
d3e2ba59 JD |
569 | if (ret < 0) { |
570 | PERROR("setsockopt inet"); | |
571 | lttcomm_destroy_sock(newsock); | |
d3e2ba59 JD |
572 | goto error; |
573 | } | |
5a693d30 MD |
574 | new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN); |
575 | if (!new_conn) { | |
576 | lttcomm_destroy_sock(newsock); | |
577 | goto error; | |
578 | } | |
579 | /* Ownership assumed by the connection. */ | |
580 | newsock = NULL; | |
d3e2ba59 | 581 | |
58eb9381 | 582 | /* Enqueue request for the dispatcher thread. */ |
8bdee6e2 SM |
583 | cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail, |
584 | &new_conn->qnode); | |
d3e2ba59 JD |
585 | |
586 | /* | |
5a693d30 MD |
587 | * Wake the dispatch queue futex. |
588 | * Implicit memory barrier with the | |
589 | * exchange in cds_wfcq_enqueue. | |
d3e2ba59 | 590 | */ |
58eb9381 | 591 | futex_nto1_wake(&viewer_conn_queue.futex); |
d3e2ba59 JD |
592 | } |
593 | } | |
594 | } | |
595 | ||
596 | exit: | |
597 | error: | |
598 | error_poll_add: | |
9b5e0863 | 599 | error_testpoint: |
d3e2ba59 JD |
600 | lttng_poll_clean(&events); |
601 | error_create_poll: | |
602 | if (live_control_sock->fd >= 0) { | |
603 | ret = live_control_sock->ops->close(live_control_sock); | |
604 | if (ret) { | |
605 | PERROR("close"); | |
606 | } | |
607 | } | |
608 | lttcomm_destroy_sock(live_control_sock); | |
609 | error_sock_control: | |
610 | if (err) { | |
eea7556c | 611 | health_error(); |
d3e2ba59 JD |
612 | DBG("Live viewer listener thread exited with error"); |
613 | } | |
eea7556c | 614 | health_unregister(health_relayd); |
d3e2ba59 | 615 | DBG("Live viewer listener thread cleanup complete"); |
b4aacfdc MD |
616 | if (lttng_relay_stop_threads()) { |
617 | ERR("Error stopping threads"); | |
178a0557 | 618 | } |
d3e2ba59 JD |
619 | return NULL; |
620 | } | |
621 | ||
622 | /* | |
623 | * This thread manages the dispatching of the requests to worker threads | |
624 | */ | |
625 | static | |
626 | void *thread_dispatcher(void *data) | |
627 | { | |
6cd525e8 MD |
628 | int err = -1; |
629 | ssize_t ret; | |
8bdee6e2 | 630 | struct cds_wfcq_node *node; |
58eb9381 | 631 | struct relay_connection *conn = NULL; |
d3e2ba59 JD |
632 | |
633 | DBG("[thread] Live viewer relay dispatcher started"); | |
634 | ||
eea7556c MD |
635 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
636 | ||
9b5e0863 MD |
637 | if (testpoint(relayd_thread_live_dispatcher)) { |
638 | goto error_testpoint; | |
639 | } | |
640 | ||
eea7556c MD |
641 | health_code_update(); |
642 | ||
d3e2ba59 | 643 | while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
eea7556c MD |
644 | health_code_update(); |
645 | ||
d3e2ba59 | 646 | /* Atomically prepare the queue futex */ |
58eb9381 | 647 | futex_nto1_prepare(&viewer_conn_queue.futex); |
d3e2ba59 JD |
648 | |
649 | do { | |
eea7556c MD |
650 | health_code_update(); |
651 | ||
d3e2ba59 | 652 | /* Dequeue commands */ |
8bdee6e2 SM |
653 | node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head, |
654 | &viewer_conn_queue.tail); | |
d3e2ba59 JD |
655 | if (node == NULL) { |
656 | DBG("Woken up but nothing in the live-viewer " | |
657 | "relay command queue"); | |
658 | /* Continue thread execution */ | |
659 | break; | |
660 | } | |
58eb9381 | 661 | conn = caa_container_of(node, struct relay_connection, qnode); |
d3e2ba59 | 662 | DBG("Dispatching viewer request waiting on sock %d", |
58eb9381 | 663 | conn->sock->fd); |
d3e2ba59 JD |
664 | |
665 | /* | |
5a693d30 MD |
666 | * Inform worker thread of the new request. This |
667 | * call is blocking so we can be assured that | |
668 | * the data will be read at some point in time | |
669 | * or wait to the end of the world :) | |
d3e2ba59 | 670 | */ |
58eb9381 DG |
671 | ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn)); |
672 | if (ret < 0) { | |
673 | PERROR("write conn pipe"); | |
5a693d30 | 674 | connection_put(conn); |
d3e2ba59 JD |
675 | goto error; |
676 | } | |
677 | } while (node != NULL); | |
678 | ||
679 | /* Futex wait on queue. Blocking call on futex() */ | |
eea7556c | 680 | health_poll_entry(); |
58eb9381 | 681 | futex_nto1_wait(&viewer_conn_queue.futex); |
eea7556c | 682 | health_poll_exit(); |
d3e2ba59 JD |
683 | } |
684 | ||
eea7556c MD |
685 | /* Normal exit, no error */ |
686 | err = 0; | |
687 | ||
d3e2ba59 | 688 | error: |
9b5e0863 | 689 | error_testpoint: |
eea7556c MD |
690 | if (err) { |
691 | health_error(); | |
692 | ERR("Health error occurred in %s", __func__); | |
693 | } | |
694 | health_unregister(health_relayd); | |
d3e2ba59 | 695 | DBG("Live viewer dispatch thread dying"); |
b4aacfdc MD |
696 | if (lttng_relay_stop_threads()) { |
697 | ERR("Error stopping threads"); | |
178a0557 | 698 | } |
d3e2ba59 JD |
699 | return NULL; |
700 | } | |
701 | ||
702 | /* | |
703 | * Establish connection with the viewer and check the versions. | |
704 | * | |
705 | * Return 0 on success or else negative value. | |
706 | */ | |
707 | static | |
58eb9381 | 708 | int viewer_connect(struct relay_connection *conn) |
d3e2ba59 JD |
709 | { |
710 | int ret; | |
711 | struct lttng_viewer_connect reply, msg; | |
712 | ||
58eb9381 | 713 | conn->version_check_done = 1; |
d3e2ba59 | 714 | |
eea7556c MD |
715 | health_code_update(); |
716 | ||
2f8f53af DG |
717 | DBG("Viewer is establishing a connection to the relayd."); |
718 | ||
58eb9381 | 719 | ret = recv_request(conn->sock, &msg, sizeof(msg)); |
2f8f53af | 720 | if (ret < 0) { |
d3e2ba59 JD |
721 | goto end; |
722 | } | |
723 | ||
eea7556c MD |
724 | health_code_update(); |
725 | ||
f46b2ce6 | 726 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 JD |
727 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
728 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
729 | ||
730 | /* Major versions must be the same */ | |
731 | if (reply.major != be32toh(msg.major)) { | |
2f8f53af DG |
732 | DBG("Incompatible major versions ([relayd] %u vs [client] %u)", |
733 | reply.major, be32toh(msg.major)); | |
72180669 | 734 | ret = -1; |
d3e2ba59 JD |
735 | goto end; |
736 | } | |
737 | ||
58eb9381 | 738 | conn->major = reply.major; |
d3e2ba59 JD |
739 | /* We adapt to the lowest compatible version */ |
740 | if (reply.minor <= be32toh(msg.minor)) { | |
58eb9381 | 741 | conn->minor = reply.minor; |
d3e2ba59 | 742 | } else { |
58eb9381 | 743 | conn->minor = be32toh(msg.minor); |
d3e2ba59 JD |
744 | } |
745 | ||
c4e361a4 | 746 | if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) { |
58eb9381 | 747 | conn->type = RELAY_VIEWER_COMMAND; |
c4e361a4 | 748 | } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) { |
58eb9381 | 749 | conn->type = RELAY_VIEWER_NOTIFICATION; |
d3e2ba59 JD |
750 | } else { |
751 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
752 | ret = -1; | |
753 | goto end; | |
754 | } | |
755 | ||
756 | reply.major = htobe32(reply.major); | |
757 | reply.minor = htobe32(reply.minor); | |
58eb9381 | 758 | if (conn->type == RELAY_VIEWER_COMMAND) { |
93b4787b | 759 | /* |
5a693d30 MD |
760 | * Increment outside of htobe64 macro, because the argument can |
761 | * be used more than once within the macro, and thus the | |
762 | * operation may be undefined. | |
93b4787b | 763 | */ |
5a693d30 | 764 | pthread_mutex_lock(&last_relay_viewer_session_id_lock); |
93b4787b | 765 | last_relay_viewer_session_id++; |
5a693d30 | 766 | pthread_mutex_unlock(&last_relay_viewer_session_id_lock); |
93b4787b | 767 | reply.viewer_session_id = htobe64(last_relay_viewer_session_id); |
d3e2ba59 | 768 | } |
eea7556c MD |
769 | |
770 | health_code_update(); | |
771 | ||
58eb9381 | 772 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 773 | if (ret < 0) { |
2f8f53af | 774 | goto end; |
d3e2ba59 JD |
775 | } |
776 | ||
eea7556c MD |
777 | health_code_update(); |
778 | ||
58eb9381 | 779 | DBG("Version check done using protocol %u.%u", conn->major, conn->minor); |
d3e2ba59 JD |
780 | ret = 0; |
781 | ||
782 | end: | |
783 | return ret; | |
784 | } | |
785 | ||
786 | /* | |
787 | * Send the viewer the list of current sessions. | |
5a693d30 MD |
788 | * We need to create a copy of the hash table content because otherwise |
789 | * we cannot assume the number of entries stays the same between getting | |
790 | * the number of HT elements and iteration over the HT. | |
d3e2ba59 JD |
791 | * |
792 | * Return 0 on success or else a negative value. | |
793 | */ | |
794 | static | |
58eb9381 | 795 | int viewer_list_sessions(struct relay_connection *conn) |
d3e2ba59 JD |
796 | { |
797 | int ret; | |
798 | struct lttng_viewer_list_sessions session_list; | |
d3e2ba59 | 799 | struct lttng_ht_iter iter; |
d3e2ba59 | 800 | struct relay_session *session; |
5a693d30 MD |
801 | struct lttng_viewer_session *send_session_buf = NULL; |
802 | uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT; | |
803 | uint32_t count = 0; | |
d3e2ba59 JD |
804 | |
805 | DBG("List sessions received"); | |
806 | ||
5a693d30 MD |
807 | send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf)); |
808 | if (!send_session_buf) { | |
809 | return -1; | |
d3e2ba59 JD |
810 | } |
811 | ||
5a693d30 MD |
812 | rcu_read_lock(); |
813 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session, | |
2f8f53af | 814 | session_n.node) { |
5a693d30 | 815 | struct lttng_viewer_session *send_session; |
d3e2ba59 | 816 | |
eea7556c MD |
817 | health_code_update(); |
818 | ||
5a693d30 MD |
819 | if (count >= buf_count) { |
820 | struct lttng_viewer_session *newbuf; | |
821 | uint32_t new_buf_count = buf_count << 1; | |
eea7556c | 822 | |
5a693d30 MD |
823 | newbuf = realloc(send_session_buf, |
824 | new_buf_count * sizeof(*send_session_buf)); | |
825 | if (!newbuf) { | |
826 | ret = -1; | |
827 | rcu_read_unlock(); | |
828 | goto end_free; | |
829 | } | |
830 | send_session_buf = newbuf; | |
831 | buf_count = new_buf_count; | |
6763619c | 832 | } |
5a693d30 MD |
833 | send_session = &send_session_buf[count]; |
834 | strncpy(send_session->session_name, session->session_name, | |
835 | sizeof(send_session->session_name)); | |
836 | strncpy(send_session->hostname, session->hostname, | |
837 | sizeof(send_session->hostname)); | |
838 | send_session->id = htobe64(session->id); | |
839 | send_session->live_timer = htobe32(session->live_timer); | |
840 | if (session->viewer_attached) { | |
841 | send_session->clients = htobe32(1); | |
842 | } else { | |
843 | send_session->clients = htobe32(0); | |
d227d5bd | 844 | } |
5a693d30 MD |
845 | send_session->streams = htobe32(session->stream_count); |
846 | count++; | |
847 | } | |
848 | rcu_read_unlock(); | |
d227d5bd | 849 | |
5a693d30 | 850 | session_list.sessions_count = htobe32(count); |
d227d5bd | 851 | |
5a693d30 | 852 | health_code_update(); |
d227d5bd | 853 | |
5a693d30 MD |
854 | ret = send_response(conn->sock, &session_list, sizeof(session_list)); |
855 | if (ret < 0) { | |
856 | goto end_free; | |
d227d5bd | 857 | } |
d227d5bd | 858 | |
5a693d30 | 859 | health_code_update(); |
d227d5bd | 860 | |
5a693d30 MD |
861 | ret = send_response(conn->sock, send_session_buf, |
862 | count * sizeof(*send_session_buf)); | |
863 | if (ret < 0) { | |
864 | goto end_free; | |
d227d5bd | 865 | } |
5a693d30 | 866 | health_code_update(); |
d227d5bd | 867 | |
5a693d30 MD |
868 | ret = 0; |
869 | end_free: | |
870 | free(send_session_buf); | |
871 | return ret; | |
d227d5bd JD |
872 | } |
873 | ||
80e8027a | 874 | /* |
5a693d30 | 875 | * Send the viewer the list of current streams. |
80e8027a JD |
876 | */ |
877 | static | |
58eb9381 | 878 | int viewer_get_new_streams(struct relay_connection *conn) |
80e8027a JD |
879 | { |
880 | int ret, send_streams = 0; | |
5a693d30 | 881 | uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0; |
80e8027a JD |
882 | struct lttng_viewer_new_streams_request request; |
883 | struct lttng_viewer_new_streams_response response; | |
80e8027a | 884 | struct relay_session *session; |
6763619c | 885 | uint64_t session_id; |
47d9f81a | 886 | bool closed = false; |
80e8027a | 887 | |
58eb9381 | 888 | assert(conn); |
80e8027a JD |
889 | |
890 | DBG("Get new streams received"); | |
891 | ||
80e8027a JD |
892 | health_code_update(); |
893 | ||
2f8f53af | 894 | /* Receive the request from the connected client. */ |
58eb9381 | 895 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 896 | if (ret < 0) { |
80e8027a JD |
897 | goto error; |
898 | } | |
6763619c | 899 | session_id = be64toh(request.session_id); |
80e8027a JD |
900 | |
901 | health_code_update(); | |
902 | ||
53efb85a MD |
903 | memset(&response, 0, sizeof(response)); |
904 | ||
5a693d30 | 905 | session = session_get_by_id(session_id); |
2f8f53af | 906 | if (!session) { |
6763619c | 907 | DBG("Relay session %" PRIu64 " not found", session_id); |
c4e361a4 | 908 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
909 | goto send_reply; |
910 | } | |
911 | ||
5a693d30 | 912 | if (!viewer_session_is_attached(conn->viewer_session, session)) { |
80e8027a | 913 | send_streams = 0; |
c4e361a4 | 914 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR); |
80e8027a JD |
915 | goto send_reply; |
916 | } | |
917 | ||
6763619c JD |
918 | send_streams = 1; |
919 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK); | |
920 | ||
5a693d30 | 921 | ret = make_viewer_streams(session, LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent, |
47d9f81a | 922 | &nb_created, &closed); |
2f8f53af | 923 | if (ret < 0) { |
5a693d30 | 924 | goto end_put_session; |
2f8f53af DG |
925 | } |
926 | /* Only send back the newly created streams with the unsent ones. */ | |
927 | nb_streams = nb_created + nb_unsent; | |
80e8027a JD |
928 | response.streams_count = htobe32(nb_streams); |
929 | ||
4479f682 | 930 | /* |
8cd956bc MD |
931 | * If the session is closed, HUP when there are no more streams |
932 | * with data. | |
4479f682 | 933 | */ |
47d9f81a | 934 | if (closed && nb_total == 0) { |
4479f682 | 935 | send_streams = 0; |
47d9f81a | 936 | response.streams_count = 0; |
4479f682 JD |
937 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); |
938 | goto send_reply; | |
939 | } | |
940 | ||
80e8027a JD |
941 | send_reply: |
942 | health_code_update(); | |
58eb9381 | 943 | ret = send_response(conn->sock, &response, sizeof(response)); |
80e8027a | 944 | if (ret < 0) { |
5a693d30 | 945 | goto end_put_session; |
80e8027a JD |
946 | } |
947 | health_code_update(); | |
948 | ||
949 | /* | |
5a693d30 MD |
950 | * Unknown or empty session, just return gracefully, the viewer |
951 | * knows what is happening. | |
80e8027a JD |
952 | */ |
953 | if (!send_streams || !nb_streams) { | |
954 | ret = 0; | |
5a693d30 | 955 | goto end_put_session; |
80e8027a JD |
956 | } |
957 | ||
2f8f53af | 958 | /* |
5a693d30 MD |
959 | * Send stream and *DON'T* ignore the sent flag so every viewer |
960 | * streams that were not sent from that point will be sent to | |
961 | * the viewer. | |
2f8f53af | 962 | */ |
58eb9381 | 963 | ret = send_viewer_streams(conn->sock, session, 0); |
2f8f53af | 964 | if (ret < 0) { |
5a693d30 | 965 | goto end_put_session; |
80e8027a JD |
966 | } |
967 | ||
5a693d30 MD |
968 | end_put_session: |
969 | if (session) { | |
970 | session_put(session); | |
971 | } | |
80e8027a JD |
972 | error: |
973 | return ret; | |
974 | } | |
975 | ||
d3e2ba59 JD |
976 | /* |
977 | * Send the viewer the list of current sessions. | |
978 | */ | |
979 | static | |
58eb9381 | 980 | int viewer_attach_session(struct relay_connection *conn) |
d3e2ba59 | 981 | { |
2f8f53af DG |
982 | int send_streams = 0; |
983 | ssize_t ret; | |
80e8027a | 984 | uint32_t nb_streams = 0; |
2f8f53af | 985 | enum lttng_viewer_seek seek_type; |
d3e2ba59 JD |
986 | struct lttng_viewer_attach_session_request request; |
987 | struct lttng_viewer_attach_session_response response; | |
5a693d30 | 988 | struct relay_session *session = NULL; |
47d9f81a | 989 | bool closed = false; |
d3e2ba59 | 990 | |
58eb9381 | 991 | assert(conn); |
d3e2ba59 | 992 | |
eea7556c MD |
993 | health_code_update(); |
994 | ||
2f8f53af | 995 | /* Receive the request from the connected client. */ |
58eb9381 | 996 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 997 | if (ret < 0) { |
d3e2ba59 JD |
998 | goto error; |
999 | } | |
1000 | ||
eea7556c MD |
1001 | health_code_update(); |
1002 | ||
53efb85a MD |
1003 | memset(&response, 0, sizeof(response)); |
1004 | ||
c3b7390b JD |
1005 | if (!conn->viewer_session) { |
1006 | DBG("Client trying to attach before creating a live viewer session"); | |
1007 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION); | |
1008 | goto send_reply; | |
1009 | } | |
1010 | ||
5a693d30 | 1011 | session = session_get_by_id(be64toh(request.session_id)); |
2f8f53af | 1012 | if (!session) { |
d3e2ba59 JD |
1013 | DBG("Relay session %" PRIu64 " not found", |
1014 | be64toh(request.session_id)); | |
c4e361a4 | 1015 | response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK); |
d3e2ba59 JD |
1016 | goto send_reply; |
1017 | } | |
5a693d30 MD |
1018 | DBG("Attach session ID %" PRIu64 " received", |
1019 | be64toh(request.session_id)); | |
d3e2ba59 | 1020 | |
5a693d30 | 1021 | if (session->live_timer == 0) { |
d3e2ba59 | 1022 | DBG("Not live session"); |
c4e361a4 | 1023 | response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE); |
d3e2ba59 | 1024 | goto send_reply; |
5a693d30 MD |
1025 | } |
1026 | ||
1027 | send_streams = 1; | |
1028 | ret = viewer_session_attach(conn->viewer_session, session); | |
1029 | if (ret) { | |
1030 | DBG("Already a viewer attached"); | |
1031 | response.status = htobe32(LTTNG_VIEWER_ATTACH_ALREADY); | |
1032 | goto send_reply; | |
d3e2ba59 JD |
1033 | } |
1034 | ||
1035 | switch (be32toh(request.seek)) { | |
c4e361a4 JD |
1036 | case LTTNG_VIEWER_SEEK_BEGINNING: |
1037 | case LTTNG_VIEWER_SEEK_LAST: | |
5a693d30 | 1038 | response.status = htobe32(LTTNG_VIEWER_ATTACH_OK); |
2f8f53af | 1039 | seek_type = be32toh(request.seek); |
d3e2ba59 JD |
1040 | break; |
1041 | default: | |
1042 | ERR("Wrong seek parameter"); | |
c4e361a4 | 1043 | response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR); |
d3e2ba59 JD |
1044 | send_streams = 0; |
1045 | goto send_reply; | |
1046 | } | |
1047 | ||
47d9f81a MD |
1048 | ret = make_viewer_streams(session, seek_type, &nb_streams, NULL, |
1049 | NULL, &closed); | |
2f8f53af | 1050 | if (ret < 0) { |
5a693d30 | 1051 | goto end_put_session; |
d3e2ba59 | 1052 | } |
2f8f53af | 1053 | response.streams_count = htobe32(nb_streams); |
d3e2ba59 | 1054 | |
47d9f81a MD |
1055 | /* |
1056 | * If the session is closed when the viewer is attaching, it | |
1057 | * means some of the streams may have been concurrently removed, | |
1058 | * so we don't allow the viewer to attach, even if there are | |
1059 | * streams available. | |
1060 | */ | |
1061 | if (closed) { | |
1062 | send_streams = 0; | |
1063 | response.streams_count = 0; | |
1064 | response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP); | |
1065 | goto send_reply; | |
1066 | } | |
1067 | ||
d3e2ba59 | 1068 | send_reply: |
eea7556c | 1069 | health_code_update(); |
58eb9381 | 1070 | ret = send_response(conn->sock, &response, sizeof(response)); |
d3e2ba59 | 1071 | if (ret < 0) { |
5a693d30 | 1072 | goto end_put_session; |
d3e2ba59 | 1073 | } |
eea7556c | 1074 | health_code_update(); |
d3e2ba59 JD |
1075 | |
1076 | /* | |
5a693d30 MD |
1077 | * Unknown or empty session, just return gracefully, the viewer |
1078 | * knows what is happening. | |
d3e2ba59 | 1079 | */ |
157df586 | 1080 | if (!send_streams || !nb_streams) { |
d3e2ba59 | 1081 | ret = 0; |
5a693d30 | 1082 | goto end_put_session; |
d3e2ba59 JD |
1083 | } |
1084 | ||
2f8f53af | 1085 | /* Send stream and ignore the sent flag. */ |
58eb9381 | 1086 | ret = send_viewer_streams(conn->sock, session, 1); |
2f8f53af | 1087 | if (ret < 0) { |
5a693d30 | 1088 | goto end_put_session; |
d3e2ba59 | 1089 | } |
d3e2ba59 | 1090 | |
5a693d30 MD |
1091 | end_put_session: |
1092 | if (session) { | |
1093 | session_put(session); | |
1094 | } | |
4a9daf17 JD |
1095 | error: |
1096 | return ret; | |
1097 | } | |
1098 | ||
878c34cf DG |
1099 | /* |
1100 | * Open the index file if needed for the given vstream. | |
1101 | * | |
5a693d30 MD |
1102 | * If an index file is successfully opened, the vstream index_fd set with |
1103 | * it. | |
878c34cf DG |
1104 | * |
1105 | * Return 0 on success, a negative value on error (-ENOENT if not ready yet). | |
5a693d30 MD |
1106 | * |
1107 | * Called with rstream lock held. | |
878c34cf DG |
1108 | */ |
1109 | static int try_open_index(struct relay_viewer_stream *vstream, | |
1110 | struct relay_stream *rstream) | |
1111 | { | |
1112 | int ret = 0; | |
1113 | ||
5a693d30 | 1114 | if (vstream->index_fd) { |
878c34cf DG |
1115 | goto end; |
1116 | } | |
1117 | ||
1118 | /* | |
5a693d30 | 1119 | * First time, we open the index file and at least one index is ready. |
878c34cf | 1120 | */ |
5a693d30 | 1121 | if (rstream->total_index_received == 0) { |
878c34cf DG |
1122 | ret = -ENOENT; |
1123 | goto end; | |
1124 | } | |
1125 | ret = index_open(vstream->path_name, vstream->channel_name, | |
5a693d30 MD |
1126 | vstream->stream->tracefile_count, |
1127 | vstream->current_tracefile_id); | |
878c34cf | 1128 | if (ret >= 0) { |
5a693d30 MD |
1129 | vstream->index_fd = stream_fd_create(ret); |
1130 | if (!vstream->index_fd) { | |
1131 | if (close(ret)) { | |
1132 | PERROR("close"); | |
1133 | } | |
1134 | ret = -1; | |
1135 | } else { | |
1136 | ret = 0; | |
1137 | } | |
878c34cf DG |
1138 | goto end; |
1139 | } | |
1140 | ||
1141 | end: | |
1142 | return ret; | |
1143 | } | |
1144 | ||
1145 | /* | |
5a693d30 MD |
1146 | * Check the status of the index for the given stream. This function |
1147 | * updates the index structure if needed and can put (close) the vstream | |
1148 | * in the HUP situation. | |
1149 | * | |
1150 | * Return 0 means that we can proceed with the index. A value of 1 means | |
1151 | * that the index has been updated and is ready to be sent to the | |
1152 | * client. A negative value indicates an error that can't be handled. | |
878c34cf | 1153 | * |
5a693d30 | 1154 | * Called with rstream lock held. |
878c34cf DG |
1155 | */ |
1156 | static int check_index_status(struct relay_viewer_stream *vstream, | |
1157 | struct relay_stream *rstream, struct ctf_trace *trace, | |
1158 | struct lttng_viewer_index *index) | |
1159 | { | |
1160 | int ret; | |
1161 | ||
5a693d30 MD |
1162 | if (trace->session->connection_closed |
1163 | && rstream->total_index_received | |
1164 | == vstream->last_sent_index) { | |
1165 | /* Last index sent and session connection is closed. */ | |
1166 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1167 | goto hup; | |
1168 | } else if (rstream->beacon_ts_end != -1ULL && | |
1169 | rstream->total_index_received | |
1170 | == vstream->last_sent_index) { | |
1171 | /* | |
1172 | * We've received a synchronization beacon and the last index | |
1173 | * available has been sent, the index for now is inactive. | |
1174 | * | |
1175 | * In this case, we have received a beacon which allows us to | |
1176 | * inform the client of a time interval during which we can | |
1177 | * guarantee that there are no events to read (and never will | |
1178 | * be). | |
1179 | */ | |
1180 | index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE); | |
1181 | index->timestamp_end = htobe64(rstream->beacon_ts_end); | |
1182 | index->stream_id = htobe64(rstream->ctf_stream_id); | |
1183 | goto index_ready; | |
1184 | } else if (rstream->total_index_received <= vstream->last_sent_index) { | |
1185 | /* | |
1186 | * This actually checks the case where recv == last_sent. | |
1187 | * In this case, we have not received a beacon. Therefore, we | |
1188 | * can only ask the client to retry later. | |
1189 | */ | |
1190 | index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY); | |
1191 | goto index_ready; | |
1192 | } else if (!viewer_stream_is_tracefile_seq_readable(vstream, | |
1193 | vstream->current_tracefile_seq)) { | |
1194 | /* | |
1195 | * The producer has overwritten our current file. We | |
1196 | * need to rotate. | |
1197 | */ | |
1198 | DBG("Viewer stream %" PRIu64 " rotation due to overwrite", | |
1199 | vstream->stream->stream_handle); | |
1200 | ret = viewer_stream_rotate(vstream); | |
1201 | if (ret < 0) { | |
1202 | goto end; | |
1203 | } else if (ret == 1) { | |
1204 | /* EOF across entire stream. */ | |
1205 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); | |
1206 | goto hup; | |
1207 | } | |
1208 | assert(viewer_stream_is_tracefile_seq_readable(vstream, | |
1209 | vstream->current_tracefile_seq)); | |
1210 | /* ret == 0 means successful so we continue. */ | |
1211 | ret = 0; | |
1212 | } else { | |
1213 | ssize_t read_ret; | |
1214 | char tmp[1]; | |
1215 | ||
1216 | /* | |
1217 | * Use EOF on current index file to find out when we | |
1218 | * need to rotate. | |
1219 | */ | |
1220 | read_ret = lttng_read(vstream->index_fd->fd, tmp, 1); | |
1221 | if (read_ret == 1) { | |
1222 | off_t seek_ret; | |
1223 | ||
1224 | /* There is still data to read. Rewind position. */ | |
1225 | seek_ret = lseek(vstream->index_fd->fd, -1, SEEK_CUR); | |
1226 | if (seek_ret < 0) { | |
1227 | ret = -1; | |
1228 | goto end; | |
1229 | } | |
1230 | ret = 0; | |
1231 | } else if (read_ret == 0) { | |
1232 | /* EOF. We need to rotate. */ | |
1233 | DBG("Viewer stream %" PRIu64 " rotation due to EOF", | |
1234 | vstream->stream->stream_handle); | |
1235 | ret = viewer_stream_rotate(vstream); | |
878c34cf | 1236 | if (ret < 0) { |
5a693d30 | 1237 | goto end; |
878c34cf | 1238 | } else if (ret == 1) { |
5a693d30 | 1239 | /* EOF across entire stream. */ |
878c34cf DG |
1240 | index->status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
1241 | goto hup; | |
1242 | } | |
5a693d30 MD |
1243 | assert(viewer_stream_is_tracefile_seq_readable(vstream, |
1244 | vstream->current_tracefile_seq)); | |
878c34cf | 1245 | /* ret == 0 means successful so we continue. */ |
5a693d30 MD |
1246 | ret = 0; |
1247 | } else { | |
1248 | /* Error reading index. */ | |
1249 | ret = -1; | |
878c34cf | 1250 | } |
878c34cf | 1251 | } |
5a693d30 | 1252 | end: |
878c34cf DG |
1253 | return ret; |
1254 | ||
1255 | hup: | |
5a693d30 | 1256 | viewer_stream_put(vstream); |
878c34cf DG |
1257 | index_ready: |
1258 | return 1; | |
1259 | } | |
1260 | ||
d3e2ba59 JD |
1261 | /* |
1262 | * Send the next index for a stream. | |
1263 | * | |
1264 | * Return 0 on success or else a negative value. | |
1265 | */ | |
1266 | static | |
58eb9381 | 1267 | int viewer_get_next_index(struct relay_connection *conn) |
d3e2ba59 JD |
1268 | { |
1269 | int ret; | |
878c34cf | 1270 | ssize_t read_ret; |
d3e2ba59 JD |
1271 | struct lttng_viewer_get_next_index request_index; |
1272 | struct lttng_viewer_index viewer_index; | |
50adc264 | 1273 | struct ctf_packet_index packet_index; |
5a693d30 MD |
1274 | struct relay_viewer_stream *vstream = NULL; |
1275 | struct relay_stream *rstream = NULL; | |
1276 | struct ctf_trace *ctf_trace = NULL; | |
1277 | struct relay_viewer_stream *metadata_viewer_stream = NULL; | |
d3e2ba59 | 1278 | |
58eb9381 | 1279 | assert(conn); |
d3e2ba59 JD |
1280 | |
1281 | DBG("Viewer get next index"); | |
1282 | ||
5a693d30 | 1283 | memset(&viewer_index, 0, sizeof(viewer_index)); |
eea7556c | 1284 | health_code_update(); |
2f8f53af | 1285 | |
58eb9381 | 1286 | ret = recv_request(conn->sock, &request_index, sizeof(request_index)); |
2f8f53af | 1287 | if (ret < 0) { |
d3e2ba59 JD |
1288 | goto end; |
1289 | } | |
eea7556c | 1290 | health_code_update(); |
d3e2ba59 | 1291 | |
5a693d30 | 1292 | vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id)); |
6763619c | 1293 | if (!vstream) { |
72dffa35 MD |
1294 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1295 | goto send_reply; | |
2a174661 DG |
1296 | } |
1297 | ||
5a693d30 MD |
1298 | /* Use back. ref. Protected by refcounts. */ |
1299 | rstream = vstream->stream; | |
1300 | ctf_trace = rstream->trace; | |
d3e2ba59 | 1301 | |
5a693d30 MD |
1302 | /* metadata_viewer_stream may be NULL. */ |
1303 | metadata_viewer_stream = | |
1304 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
2a174661 | 1305 | |
5a693d30 | 1306 | pthread_mutex_lock(&rstream->lock); |
d3e2ba59 JD |
1307 | |
1308 | /* | |
1309 | * The viewer should not ask for index on metadata stream. | |
1310 | */ | |
5a693d30 | 1311 | if (rstream->is_metadata) { |
c4e361a4 | 1312 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP); |
d3e2ba59 JD |
1313 | goto send_reply; |
1314 | } | |
1315 | ||
878c34cf DG |
1316 | /* Try to open an index if one is needed for that stream. */ |
1317 | ret = try_open_index(vstream, rstream); | |
1318 | if (ret < 0) { | |
0e6830aa | 1319 | if (ret == -ENOENT) { |
d3e2ba59 | 1320 | /* |
5a693d30 MD |
1321 | * The index is created only when the first data |
1322 | * packet arrives, it might not be ready at the | |
1323 | * beginning of the session | |
d3e2ba59 | 1324 | */ |
c4e361a4 | 1325 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY); |
878c34cf DG |
1326 | } else { |
1327 | /* Unhandled error. */ | |
c4e361a4 | 1328 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
d3e2ba59 | 1329 | } |
878c34cf | 1330 | goto send_reply; |
d3e2ba59 JD |
1331 | } |
1332 | ||
878c34cf | 1333 | ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index); |
878c34cf | 1334 | if (ret < 0) { |
5a693d30 | 1335 | goto error_put; |
878c34cf DG |
1336 | } else if (ret == 1) { |
1337 | /* | |
5a693d30 MD |
1338 | * We have no index to send and check_index_status has populated |
1339 | * viewer_index's status. | |
878c34cf | 1340 | */ |
d3e2ba59 JD |
1341 | goto send_reply; |
1342 | } | |
5a693d30 | 1343 | /* At this point, ret is 0 thus we will be able to read the index. */ |
878c34cf | 1344 | assert(!ret); |
d3e2ba59 | 1345 | |
5a693d30 MD |
1346 | /* |
1347 | * vstream->stream_fd may be NULL if it has been closed by | |
1348 | * tracefile rotation, or if we are at the beginning of the | |
1349 | * stream. We open the data stream file here to protect against | |
1350 | * overwrite caused by tracefile rotation (in association with | |
1351 | * unlink performed before overwrite). | |
1352 | */ | |
1353 | if (!vstream->stream_fd) { | |
1354 | char fullpath[PATH_MAX]; | |
1355 | ||
1356 | if (vstream->stream->tracefile_count > 0) { | |
1357 | ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64, | |
1358 | vstream->path_name, | |
1359 | vstream->channel_name, | |
1360 | vstream->current_tracefile_id); | |
1361 | } else { | |
1362 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", | |
1363 | vstream->path_name, | |
1364 | vstream->channel_name); | |
1365 | } | |
1366 | if (ret < 0) { | |
1367 | goto error_put; | |
1368 | } | |
1369 | ret = open(fullpath, O_RDONLY); | |
1370 | if (ret < 0) { | |
1371 | PERROR("Relay opening trace file"); | |
1372 | goto error_put; | |
1373 | } | |
1374 | vstream->stream_fd = stream_fd_create(ret); | |
1375 | if (!vstream->stream_fd) { | |
1376 | if (close(ret)) { | |
1377 | PERROR("close"); | |
1378 | } | |
1379 | goto error_put; | |
1380 | } | |
d3e2ba59 JD |
1381 | } |
1382 | ||
f04a971b | 1383 | ret = check_new_streams(conn); |
4a9daf17 | 1384 | if (ret < 0) { |
5a693d30 MD |
1385 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); |
1386 | goto send_reply; | |
4a9daf17 JD |
1387 | } else if (ret == 1) { |
1388 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; | |
1389 | } | |
1390 | ||
5a693d30 | 1391 | read_ret = lttng_read(vstream->index_fd->fd, &packet_index, |
6cd525e8 | 1392 | sizeof(packet_index)); |
5a693d30 MD |
1393 | if (read_ret < sizeof(packet_index)) { |
1394 | ERR("Relay reading index file %d returned %zd", | |
1395 | vstream->index_fd->fd, read_ret); | |
1396 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR); | |
6b6b9a5a | 1397 | goto send_reply; |
d3e2ba59 | 1398 | } else { |
c4e361a4 | 1399 | viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK); |
d3e2ba59 JD |
1400 | vstream->last_sent_index++; |
1401 | } | |
1402 | ||
1403 | /* | |
1404 | * Indexes are stored in big endian, no need to switch before sending. | |
1405 | */ | |
5a693d30 MD |
1406 | DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64, |
1407 | rstream->stream_handle, | |
1408 | be64toh(packet_index.offset)); | |
d3e2ba59 JD |
1409 | viewer_index.offset = packet_index.offset; |
1410 | viewer_index.packet_size = packet_index.packet_size; | |
1411 | viewer_index.content_size = packet_index.content_size; | |
1412 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1413 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1414 | viewer_index.events_discarded = packet_index.events_discarded; | |
1415 | viewer_index.stream_id = packet_index.stream_id; | |
1416 | ||
1417 | send_reply: | |
72dffa35 MD |
1418 | if (rstream) { |
1419 | pthread_mutex_unlock(&rstream->lock); | |
1420 | } | |
5a693d30 MD |
1421 | |
1422 | if (metadata_viewer_stream) { | |
1423 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); | |
1424 | DBG("get next index metadata check: recv %" PRIu64 | |
1425 | " sent %" PRIu64, | |
1426 | metadata_viewer_stream->stream->metadata_received, | |
1427 | metadata_viewer_stream->metadata_sent); | |
1428 | if (!metadata_viewer_stream->stream->metadata_received || | |
1429 | metadata_viewer_stream->stream->metadata_received > | |
1430 | metadata_viewer_stream->metadata_sent) { | |
1431 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1432 | } | |
1433 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); | |
1434 | } | |
1435 | ||
d3e2ba59 | 1436 | viewer_index.flags = htobe32(viewer_index.flags); |
eea7556c | 1437 | health_code_update(); |
2f8f53af | 1438 | |
58eb9381 | 1439 | ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index)); |
d3e2ba59 | 1440 | if (ret < 0) { |
5a693d30 | 1441 | goto end; |
d3e2ba59 | 1442 | } |
eea7556c | 1443 | health_code_update(); |
d3e2ba59 | 1444 | |
2f8f53af | 1445 | DBG("Index %" PRIu64 " for stream %" PRIu64 " sent", |
5a693d30 MD |
1446 | vstream->last_sent_index, |
1447 | vstream->stream->stream_handle); | |
d3e2ba59 | 1448 | end: |
5a693d30 MD |
1449 | if (metadata_viewer_stream) { |
1450 | viewer_stream_put(metadata_viewer_stream); | |
1451 | } | |
1452 | if (vstream) { | |
1453 | viewer_stream_put(vstream); | |
1454 | } | |
1455 | return ret; | |
1456 | ||
1457 | error_put: | |
1458 | pthread_mutex_unlock(&rstream->lock); | |
1459 | if (metadata_viewer_stream) { | |
1460 | viewer_stream_put(metadata_viewer_stream); | |
1461 | } | |
1462 | viewer_stream_put(vstream); | |
d3e2ba59 JD |
1463 | return ret; |
1464 | } | |
1465 | ||
1466 | /* | |
1467 | * Send the next index for a stream | |
1468 | * | |
1469 | * Return 0 on success or else a negative value. | |
1470 | */ | |
1471 | static | |
58eb9381 | 1472 | int viewer_get_packet(struct relay_connection *conn) |
d3e2ba59 JD |
1473 | { |
1474 | int ret, send_data = 0; | |
1475 | char *data = NULL; | |
1476 | uint32_t len = 0; | |
1477 | ssize_t read_len; | |
1478 | struct lttng_viewer_get_packet get_packet_info; | |
1479 | struct lttng_viewer_trace_packet reply; | |
5a693d30 | 1480 | struct relay_viewer_stream *vstream = NULL; |
2a174661 | 1481 | struct ctf_trace *ctf_trace; |
5a693d30 | 1482 | struct relay_viewer_stream *metadata_viewer_stream = NULL; |
d3e2ba59 JD |
1483 | |
1484 | DBG2("Relay get data packet"); | |
1485 | ||
eea7556c | 1486 | health_code_update(); |
2f8f53af | 1487 | |
5a693d30 MD |
1488 | ret = recv_request(conn->sock, &get_packet_info, |
1489 | sizeof(get_packet_info)); | |
2f8f53af | 1490 | if (ret < 0) { |
d3e2ba59 JD |
1491 | goto end; |
1492 | } | |
eea7556c | 1493 | health_code_update(); |
d3e2ba59 | 1494 | |
0233a6a5 DG |
1495 | /* From this point on, the error label can be reached. */ |
1496 | memset(&reply, 0, sizeof(reply)); | |
1497 | ||
5a693d30 MD |
1498 | vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id)); |
1499 | if (!vstream) { | |
78e607b7 MD |
1500 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
1501 | goto send_reply_nolock; | |
d3e2ba59 | 1502 | } |
2a174661 | 1503 | |
5a693d30 | 1504 | ctf_trace = vstream->stream->trace; |
6763619c | 1505 | |
5a693d30 MD |
1506 | /* metadata_viewer_stream may be NULL. */ |
1507 | metadata_viewer_stream = | |
1508 | ctf_trace_get_viewer_metadata_stream(ctf_trace); | |
d3e2ba59 | 1509 | |
5a693d30 MD |
1510 | if (metadata_viewer_stream) { |
1511 | bool get_packet_err = false; | |
d3e2ba59 | 1512 | |
5a693d30 MD |
1513 | pthread_mutex_lock(&metadata_viewer_stream->stream->lock); |
1514 | DBG("get packet metadata check: recv %" PRIu64 " sent %" PRIu64, | |
1515 | metadata_viewer_stream->stream->metadata_received, | |
1516 | metadata_viewer_stream->metadata_sent); | |
1517 | if (!metadata_viewer_stream->stream->metadata_received || | |
1518 | metadata_viewer_stream->stream->metadata_received > | |
1519 | metadata_viewer_stream->metadata_sent) { | |
1520 | /* | |
1521 | * We prevent the client from reading a data stream as | |
1522 | * long as there is metadata left to consume. This | |
1523 | * ensures that the client won't receive data of which | |
1524 | * it can't make sense. | |
1525 | */ | |
1526 | get_packet_err = true; | |
d3e2ba59 | 1527 | } |
5a693d30 MD |
1528 | pthread_mutex_unlock(&metadata_viewer_stream->stream->lock); |
1529 | viewer_stream_put(metadata_viewer_stream); | |
1530 | if (get_packet_err) { | |
1531 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); | |
1532 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1533 | goto send_reply_nolock; | |
d3e2ba59 | 1534 | } |
d3e2ba59 JD |
1535 | } |
1536 | ||
5a693d30 MD |
1537 | pthread_mutex_lock(&vstream->stream->lock); |
1538 | /* | |
1539 | * The vstream->stream_fd used here has been opened by | |
1540 | * get_next_index. It is opened there because this is what | |
1541 | * allows us to grab a reference to the file with stream lock | |
1542 | * held, thus protecting us against overwrite caused by | |
1543 | * tracefile rotation. Since tracefile rotation unlinks the old | |
1544 | * data file, we are ensured that we won't have our data | |
1545 | * overwritten under us. | |
1546 | */ | |
f04a971b | 1547 | ret = check_new_streams(conn); |
4a9daf17 | 1548 | if (ret < 0) { |
5a693d30 | 1549 | goto end_free; |
4a9daf17 | 1550 | } else if (ret == 1) { |
c4e361a4 | 1551 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
4a9daf17 JD |
1552 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM; |
1553 | goto send_reply; | |
1554 | } | |
1555 | ||
d3e2ba59 JD |
1556 | len = be32toh(get_packet_info.len); |
1557 | data = zmalloc(len); | |
1558 | if (!data) { | |
1559 | PERROR("relay data zmalloc"); | |
1560 | goto error; | |
1561 | } | |
1562 | ||
5a693d30 MD |
1563 | ret = lseek(vstream->stream_fd->fd, be64toh(get_packet_info.offset), |
1564 | SEEK_SET); | |
d3e2ba59 | 1565 | if (ret < 0) { |
5a693d30 MD |
1566 | PERROR("lseek fd %d to offset %" PRIu64, vstream->stream_fd->fd, |
1567 | be64toh(get_packet_info.offset)); | |
1568 | goto error; | |
d3e2ba59 | 1569 | } |
5a693d30 | 1570 | read_len = lttng_read(vstream->stream_fd->fd, data, len); |
6cd525e8 | 1571 | if (read_len < len) { |
5a693d30 MD |
1572 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, |
1573 | vstream->stream_fd->fd, | |
1574 | be64toh(get_packet_info.offset)); | |
1575 | goto error; | |
d3e2ba59 | 1576 | } |
c4e361a4 | 1577 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK); |
d3e2ba59 JD |
1578 | reply.len = htobe32(len); |
1579 | send_data = 1; | |
1580 | goto send_reply; | |
1581 | ||
1582 | error: | |
c4e361a4 | 1583 | reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR); |
d3e2ba59 JD |
1584 | |
1585 | send_reply: | |
5a693d30 MD |
1586 | if (vstream) { |
1587 | pthread_mutex_unlock(&vstream->stream->lock); | |
1588 | } | |
1589 | send_reply_nolock: | |
d3e2ba59 | 1590 | reply.flags = htobe32(reply.flags); |
eea7556c MD |
1591 | |
1592 | health_code_update(); | |
2f8f53af | 1593 | |
58eb9381 | 1594 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1595 | if (ret < 0) { |
5a693d30 | 1596 | goto end_free; |
d3e2ba59 | 1597 | } |
eea7556c | 1598 | health_code_update(); |
d3e2ba59 JD |
1599 | |
1600 | if (send_data) { | |
eea7556c | 1601 | health_code_update(); |
58eb9381 | 1602 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1603 | if (ret < 0) { |
5a693d30 | 1604 | goto end_free; |
d3e2ba59 | 1605 | } |
eea7556c | 1606 | health_code_update(); |
d3e2ba59 JD |
1607 | } |
1608 | ||
1609 | DBG("Sent %u bytes for stream %" PRIu64, len, | |
1610 | be64toh(get_packet_info.stream_id)); | |
1611 | ||
5a693d30 | 1612 | end_free: |
d3e2ba59 | 1613 | free(data); |
d3e2ba59 | 1614 | end: |
5a693d30 MD |
1615 | if (vstream) { |
1616 | viewer_stream_put(vstream); | |
1617 | } | |
d3e2ba59 JD |
1618 | return ret; |
1619 | } | |
1620 | ||
1621 | /* | |
1622 | * Send the session's metadata | |
1623 | * | |
1624 | * Return 0 on success else a negative value. | |
1625 | */ | |
1626 | static | |
58eb9381 | 1627 | int viewer_get_metadata(struct relay_connection *conn) |
d3e2ba59 JD |
1628 | { |
1629 | int ret = 0; | |
1630 | ssize_t read_len; | |
1631 | uint64_t len = 0; | |
1632 | char *data = NULL; | |
1633 | struct lttng_viewer_get_metadata request; | |
1634 | struct lttng_viewer_metadata_packet reply; | |
5a693d30 | 1635 | struct relay_viewer_stream *vstream = NULL; |
d3e2ba59 | 1636 | |
58eb9381 | 1637 | assert(conn); |
d3e2ba59 JD |
1638 | |
1639 | DBG("Relay get metadata"); | |
1640 | ||
eea7556c | 1641 | health_code_update(); |
2f8f53af | 1642 | |
58eb9381 | 1643 | ret = recv_request(conn->sock, &request, sizeof(request)); |
2f8f53af | 1644 | if (ret < 0) { |
d3e2ba59 JD |
1645 | goto end; |
1646 | } | |
eea7556c | 1647 | health_code_update(); |
d3e2ba59 | 1648 | |
53efb85a MD |
1649 | memset(&reply, 0, sizeof(reply)); |
1650 | ||
5a693d30 MD |
1651 | vstream = viewer_stream_get_by_id(be64toh(request.stream_id)); |
1652 | if (!vstream) { | |
16d6d62d MD |
1653 | /* |
1654 | * The metadata stream can be closed by a CLOSE command | |
1655 | * just before we attach. It can also be closed by | |
1656 | * per-pid tracing during tracing. Therefore, it is | |
1657 | * possible that we cannot find this viewer stream. | |
1658 | * Reply back to the client with an error if we cannot | |
1659 | * find it. | |
1660 | */ | |
1661 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); | |
5a693d30 | 1662 | goto send_reply; |
d3e2ba59 | 1663 | } |
5a693d30 MD |
1664 | pthread_mutex_lock(&vstream->stream->lock); |
1665 | if (!vstream->stream->is_metadata) { | |
1666 | ERR("Invalid metadata stream"); | |
6763619c JD |
1667 | goto error; |
1668 | } | |
1669 | ||
5a693d30 | 1670 | assert(vstream->metadata_sent <= vstream->stream->metadata_received); |
2a174661 | 1671 | |
5a693d30 | 1672 | len = vstream->stream->metadata_received - vstream->metadata_sent; |
d3e2ba59 | 1673 | if (len == 0) { |
c4e361a4 | 1674 | reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA); |
d3e2ba59 JD |
1675 | goto send_reply; |
1676 | } | |
1677 | ||
1678 | /* first time, we open the metadata file */ | |
5a693d30 | 1679 | if (!vstream->stream_fd) { |
d3e2ba59 JD |
1680 | char fullpath[PATH_MAX]; |
1681 | ||
5a693d30 MD |
1682 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", vstream->path_name, |
1683 | vstream->channel_name); | |
d3e2ba59 JD |
1684 | if (ret < 0) { |
1685 | goto error; | |
1686 | } | |
1687 | ret = open(fullpath, O_RDONLY); | |
1688 | if (ret < 0) { | |
1689 | PERROR("Relay opening metadata file"); | |
1690 | goto error; | |
1691 | } | |
5a693d30 MD |
1692 | vstream->stream_fd = stream_fd_create(ret); |
1693 | if (!vstream->stream_fd) { | |
1694 | if (close(ret)) { | |
1695 | PERROR("close"); | |
1696 | } | |
1697 | goto error; | |
1698 | } | |
d3e2ba59 JD |
1699 | } |
1700 | ||
1701 | reply.len = htobe64(len); | |
1702 | data = zmalloc(len); | |
1703 | if (!data) { | |
1704 | PERROR("viewer metadata zmalloc"); | |
1705 | goto error; | |
1706 | } | |
1707 | ||
5a693d30 | 1708 | read_len = lttng_read(vstream->stream_fd->fd, data, len); |
6cd525e8 | 1709 | if (read_len < len) { |
d3e2ba59 JD |
1710 | PERROR("Relay reading metadata file"); |
1711 | goto error; | |
1712 | } | |
5a693d30 MD |
1713 | vstream->metadata_sent += read_len; |
1714 | if (vstream->metadata_sent == vstream->stream->metadata_received | |
1715 | && vstream->stream->closed) { | |
1716 | /* Release ownership for the viewer metadata stream. */ | |
1717 | viewer_stream_put(vstream); | |
1718 | } | |
1719 | ||
c4e361a4 | 1720 | reply.status = htobe32(LTTNG_VIEWER_METADATA_OK); |
5a693d30 | 1721 | |
d3e2ba59 JD |
1722 | goto send_reply; |
1723 | ||
1724 | error: | |
c4e361a4 | 1725 | reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR); |
d3e2ba59 JD |
1726 | |
1727 | send_reply: | |
eea7556c | 1728 | health_code_update(); |
5a693d30 MD |
1729 | if (vstream) { |
1730 | pthread_mutex_unlock(&vstream->stream->lock); | |
1731 | } | |
58eb9381 | 1732 | ret = send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 | 1733 | if (ret < 0) { |
5a693d30 | 1734 | goto end_free; |
d3e2ba59 | 1735 | } |
eea7556c | 1736 | health_code_update(); |
d3e2ba59 JD |
1737 | |
1738 | if (len > 0) { | |
58eb9381 | 1739 | ret = send_response(conn->sock, data, len); |
d3e2ba59 | 1740 | if (ret < 0) { |
5a693d30 | 1741 | goto end_free; |
d3e2ba59 JD |
1742 | } |
1743 | } | |
1744 | ||
1745 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
1746 | be64toh(request.stream_id)); | |
1747 | ||
1748 | DBG("Metadata sent"); | |
1749 | ||
5a693d30 | 1750 | end_free: |
d3e2ba59 | 1751 | free(data); |
d3e2ba59 | 1752 | end: |
5a693d30 MD |
1753 | if (vstream) { |
1754 | viewer_stream_put(vstream); | |
1755 | } | |
d3e2ba59 JD |
1756 | return ret; |
1757 | } | |
1758 | ||
c3b7390b JD |
1759 | /* |
1760 | * Create a viewer session. | |
1761 | * | |
1762 | * Return 0 on success or else a negative value. | |
1763 | */ | |
1764 | static | |
1765 | int viewer_create_session(struct relay_connection *conn) | |
1766 | { | |
1767 | int ret; | |
1768 | struct lttng_viewer_create_session_response resp; | |
1769 | ||
1770 | DBG("Viewer create session received"); | |
1771 | ||
53efb85a | 1772 | memset(&resp, 0, sizeof(resp)); |
c3b7390b | 1773 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK); |
5a693d30 | 1774 | conn->viewer_session = viewer_session_create(); |
c3b7390b JD |
1775 | if (!conn->viewer_session) { |
1776 | ERR("Allocation viewer session"); | |
1777 | resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR); | |
1778 | goto send_reply; | |
1779 | } | |
c3b7390b JD |
1780 | |
1781 | send_reply: | |
1782 | health_code_update(); | |
1783 | ret = send_response(conn->sock, &resp, sizeof(resp)); | |
1784 | if (ret < 0) { | |
1785 | goto end; | |
1786 | } | |
1787 | health_code_update(); | |
1788 | ret = 0; | |
1789 | ||
1790 | end: | |
1791 | return ret; | |
1792 | } | |
1793 | ||
1794 | ||
d3e2ba59 JD |
1795 | /* |
1796 | * live_relay_unknown_command: send -1 if received unknown command | |
1797 | */ | |
1798 | static | |
58eb9381 | 1799 | void live_relay_unknown_command(struct relay_connection *conn) |
d3e2ba59 JD |
1800 | { |
1801 | struct lttcomm_relayd_generic_reply reply; | |
d3e2ba59 | 1802 | |
53efb85a | 1803 | memset(&reply, 0, sizeof(reply)); |
d3e2ba59 | 1804 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
58eb9381 | 1805 | (void) send_response(conn->sock, &reply, sizeof(reply)); |
d3e2ba59 JD |
1806 | } |
1807 | ||
1808 | /* | |
1809 | * Process the commands received on the control socket | |
1810 | */ | |
1811 | static | |
1812 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
58eb9381 | 1813 | struct relay_connection *conn) |
d3e2ba59 JD |
1814 | { |
1815 | int ret = 0; | |
2f8f53af DG |
1816 | uint32_t msg_value; |
1817 | ||
2f8f53af DG |
1818 | msg_value = be32toh(recv_hdr->cmd); |
1819 | ||
1820 | /* | |
1821 | * Make sure we've done the version check before any command other then a | |
1822 | * new client connection. | |
1823 | */ | |
c4e361a4 | 1824 | if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) { |
58eb9381 | 1825 | ERR("Viewer conn value %" PRIu32 " before version check", msg_value); |
2f8f53af DG |
1826 | ret = -1; |
1827 | goto end; | |
1828 | } | |
d3e2ba59 | 1829 | |
2f8f53af | 1830 | switch (msg_value) { |
c4e361a4 | 1831 | case LTTNG_VIEWER_CONNECT: |
58eb9381 | 1832 | ret = viewer_connect(conn); |
d3e2ba59 | 1833 | break; |
c4e361a4 | 1834 | case LTTNG_VIEWER_LIST_SESSIONS: |
58eb9381 | 1835 | ret = viewer_list_sessions(conn); |
d3e2ba59 | 1836 | break; |
c4e361a4 | 1837 | case LTTNG_VIEWER_ATTACH_SESSION: |
58eb9381 | 1838 | ret = viewer_attach_session(conn); |
d3e2ba59 | 1839 | break; |
c4e361a4 | 1840 | case LTTNG_VIEWER_GET_NEXT_INDEX: |
58eb9381 | 1841 | ret = viewer_get_next_index(conn); |
d3e2ba59 | 1842 | break; |
c4e361a4 | 1843 | case LTTNG_VIEWER_GET_PACKET: |
58eb9381 | 1844 | ret = viewer_get_packet(conn); |
d3e2ba59 | 1845 | break; |
c4e361a4 | 1846 | case LTTNG_VIEWER_GET_METADATA: |
58eb9381 | 1847 | ret = viewer_get_metadata(conn); |
d3e2ba59 | 1848 | break; |
c4e361a4 | 1849 | case LTTNG_VIEWER_GET_NEW_STREAMS: |
58eb9381 | 1850 | ret = viewer_get_new_streams(conn); |
80e8027a | 1851 | break; |
c3b7390b JD |
1852 | case LTTNG_VIEWER_CREATE_SESSION: |
1853 | ret = viewer_create_session(conn); | |
1854 | break; | |
d3e2ba59 | 1855 | default: |
5a693d30 MD |
1856 | ERR("Received unknown viewer command (%u)", |
1857 | be32toh(recv_hdr->cmd)); | |
58eb9381 | 1858 | live_relay_unknown_command(conn); |
d3e2ba59 JD |
1859 | ret = -1; |
1860 | goto end; | |
1861 | } | |
1862 | ||
1863 | end: | |
1864 | return ret; | |
1865 | } | |
1866 | ||
1867 | static | |
58eb9381 | 1868 | void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd) |
d3e2ba59 JD |
1869 | { |
1870 | int ret; | |
1871 | ||
58eb9381 | 1872 | (void) lttng_poll_del(events, pollfd); |
d3e2ba59 JD |
1873 | |
1874 | ret = close(pollfd); | |
1875 | if (ret < 0) { | |
1876 | ERR("Closing pollfd %d", pollfd); | |
1877 | } | |
1878 | } | |
1879 | ||
d3e2ba59 JD |
1880 | /* |
1881 | * This thread does the actual work | |
1882 | */ | |
1883 | static | |
1884 | void *thread_worker(void *data) | |
1885 | { | |
1886 | int ret, err = -1; | |
1887 | uint32_t nb_fd; | |
d3e2ba59 | 1888 | struct lttng_poll_event events; |
5a693d30 | 1889 | struct lttng_ht *viewer_connections_ht; |
d3e2ba59 JD |
1890 | struct lttng_ht_iter iter; |
1891 | struct lttng_viewer_cmd recv_hdr; | |
302d8906 | 1892 | struct relay_connection *destroy_conn; |
d3e2ba59 JD |
1893 | |
1894 | DBG("[thread] Live viewer relay worker started"); | |
1895 | ||
1896 | rcu_register_thread(); | |
1897 | ||
eea7556c MD |
1898 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
1899 | ||
9b5e0863 MD |
1900 | if (testpoint(relayd_thread_live_worker)) { |
1901 | goto error_testpoint; | |
1902 | } | |
1903 | ||
d3e2ba59 | 1904 | /* table of connections indexed on socket */ |
5a693d30 MD |
1905 | viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1906 | if (!viewer_connections_ht) { | |
1907 | goto viewer_connections_ht_error; | |
d3e2ba59 JD |
1908 | } |
1909 | ||
1910 | ret = create_thread_poll_set(&events, 2); | |
1911 | if (ret < 0) { | |
1912 | goto error_poll_create; | |
1913 | } | |
1914 | ||
58eb9381 | 1915 | ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP); |
d3e2ba59 JD |
1916 | if (ret < 0) { |
1917 | goto error; | |
1918 | } | |
1919 | ||
1920 | restart: | |
1921 | while (1) { | |
1922 | int i; | |
1923 | ||
eea7556c MD |
1924 | health_code_update(); |
1925 | ||
d3e2ba59 JD |
1926 | /* Infinite blocking call, waiting for transmission */ |
1927 | DBG3("Relayd live viewer worker thread polling..."); | |
eea7556c | 1928 | health_poll_entry(); |
d3e2ba59 | 1929 | ret = lttng_poll_wait(&events, -1); |
eea7556c | 1930 | health_poll_exit(); |
d3e2ba59 JD |
1931 | if (ret < 0) { |
1932 | /* | |
1933 | * Restart interrupted system call. | |
1934 | */ | |
1935 | if (errno == EINTR) { | |
1936 | goto restart; | |
1937 | } | |
1938 | goto error; | |
1939 | } | |
1940 | ||
1941 | nb_fd = ret; | |
1942 | ||
1943 | /* | |
1944 | * Process control. The control connection is prioritised so we don't | |
1945 | * starve it with high throughput tracing data on the data | |
1946 | * connection. | |
1947 | */ | |
1948 | for (i = 0; i < nb_fd; i++) { | |
1949 | /* Fetch once the poll data */ | |
1950 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1951 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1952 | ||
eea7556c MD |
1953 | health_code_update(); |
1954 | ||
fd20dac9 MD |
1955 | if (!revents) { |
1956 | /* No activity for this FD (poll implementation). */ | |
1957 | continue; | |
1958 | } | |
1959 | ||
d3e2ba59 | 1960 | /* Thread quit pipe has been closed. Killing thread. */ |
bcf4a440 | 1961 | ret = check_thread_quit_pipe(pollfd, revents); |
d3e2ba59 JD |
1962 | if (ret) { |
1963 | err = 0; | |
1964 | goto exit; | |
1965 | } | |
1966 | ||
5a693d30 | 1967 | /* Inspect the relay conn pipe for new connection. */ |
58eb9381 | 1968 | if (pollfd == live_conn_pipe[0]) { |
d3e2ba59 JD |
1969 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
1970 | ERR("Relay live pipe error"); | |
1971 | goto error; | |
1972 | } else if (revents & LPOLLIN) { | |
302d8906 JG |
1973 | struct relay_connection *conn; |
1974 | ||
5a693d30 MD |
1975 | ret = lttng_read(live_conn_pipe[0], |
1976 | &conn, sizeof(conn)); | |
d3e2ba59 JD |
1977 | if (ret < 0) { |
1978 | goto error; | |
1979 | } | |
58eb9381 DG |
1980 | lttng_poll_add(&events, conn->sock->fd, |
1981 | LPOLLIN | LPOLLRDHUP); | |
5a693d30 MD |
1982 | connection_ht_add(viewer_connections_ht, conn); |
1983 | DBG("Connection socket %d added to poll", conn->sock->fd); | |
d3e2ba59 | 1984 | } |
58eb9381 | 1985 | } else { |
5a693d30 | 1986 | /* Connection activity. */ |
302d8906 JG |
1987 | struct relay_connection *conn; |
1988 | ||
5a693d30 MD |
1989 | conn = connection_get_by_sock(viewer_connections_ht, pollfd); |
1990 | if (!conn) { | |
1991 | continue; | |
1992 | } | |
58eb9381 DG |
1993 | |
1994 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1995 | cleanup_connection_pollfd(&events, pollfd); | |
5a693d30 MD |
1996 | /* Put "create" ownership reference. */ |
1997 | connection_put(conn); | |
d3e2ba59 | 1998 | } else if (revents & LPOLLIN) { |
58eb9381 DG |
1999 | ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr, |
2000 | sizeof(recv_hdr), 0); | |
d3e2ba59 | 2001 | if (ret <= 0) { |
5a693d30 | 2002 | /* Connection closed. */ |
58eb9381 | 2003 | cleanup_connection_pollfd(&events, pollfd); |
5a693d30 MD |
2004 | /* Put "create" ownership reference. */ |
2005 | connection_put(conn); | |
58eb9381 | 2006 | DBG("Viewer control conn closed with %d", pollfd); |
d3e2ba59 | 2007 | } else { |
58eb9381 | 2008 | ret = process_control(&recv_hdr, conn); |
d3e2ba59 JD |
2009 | if (ret < 0) { |
2010 | /* Clear the session on error. */ | |
58eb9381 | 2011 | cleanup_connection_pollfd(&events, pollfd); |
5a693d30 MD |
2012 | /* Put "create" ownership reference. */ |
2013 | connection_put(conn); | |
d3e2ba59 JD |
2014 | DBG("Viewer connection closed with %d", pollfd); |
2015 | } | |
2016 | } | |
2017 | } | |
5a693d30 MD |
2018 | /* Put local "get_by_sock" reference. */ |
2019 | connection_put(conn); | |
d3e2ba59 JD |
2020 | } |
2021 | } | |
2022 | } | |
2023 | ||
2024 | exit: | |
2025 | error: | |
2026 | lttng_poll_clean(&events); | |
2027 | ||
58eb9381 | 2028 | /* Cleanup reamaining connection object. */ |
d3e2ba59 | 2029 | rcu_read_lock(); |
5a693d30 | 2030 | cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter, |
302d8906 | 2031 | destroy_conn, |
58eb9381 | 2032 | sock_n.node) { |
eea7556c | 2033 | health_code_update(); |
5a693d30 | 2034 | connection_put(destroy_conn); |
d3e2ba59 JD |
2035 | } |
2036 | rcu_read_unlock(); | |
2037 | error_poll_create: | |
5a693d30 MD |
2038 | lttng_ht_destroy(viewer_connections_ht); |
2039 | viewer_connections_ht_error: | |
58eb9381 DG |
2040 | /* Close relay conn pipes */ |
2041 | utils_close_pipe(live_conn_pipe); | |
d3e2ba59 JD |
2042 | if (err) { |
2043 | DBG("Viewer worker thread exited with error"); | |
2044 | } | |
2045 | DBG("Viewer worker thread cleanup complete"); | |
9b5e0863 | 2046 | error_testpoint: |
eea7556c MD |
2047 | if (err) { |
2048 | health_error(); | |
2049 | ERR("Health error occurred in %s", __func__); | |
2050 | } | |
2051 | health_unregister(health_relayd); | |
b4aacfdc MD |
2052 | if (lttng_relay_stop_threads()) { |
2053 | ERR("Error stopping threads"); | |
178a0557 | 2054 | } |
d3e2ba59 JD |
2055 | rcu_unregister_thread(); |
2056 | return NULL; | |
2057 | } | |
2058 | ||
2059 | /* | |
2060 | * Create the relay command pipe to wake thread_manage_apps. | |
2061 | * Closed in cleanup(). | |
2062 | */ | |
58eb9381 | 2063 | static int create_conn_pipe(void) |
d3e2ba59 | 2064 | { |
178a0557 MD |
2065 | return utils_create_pipe_cloexec(live_conn_pipe); |
2066 | } | |
d3e2ba59 | 2067 | |
178a0557 | 2068 | int relayd_live_join(void) |
d3e2ba59 | 2069 | { |
178a0557 | 2070 | int ret, retval = 0; |
d3e2ba59 JD |
2071 | void *status; |
2072 | ||
d3e2ba59 | 2073 | ret = pthread_join(live_listener_thread, &status); |
178a0557 MD |
2074 | if (ret) { |
2075 | errno = ret; | |
d3e2ba59 | 2076 | PERROR("pthread_join live listener"); |
178a0557 | 2077 | retval = -1; |
d3e2ba59 JD |
2078 | } |
2079 | ||
2080 | ret = pthread_join(live_worker_thread, &status); | |
178a0557 MD |
2081 | if (ret) { |
2082 | errno = ret; | |
d3e2ba59 | 2083 | PERROR("pthread_join live worker"); |
178a0557 | 2084 | retval = -1; |
d3e2ba59 JD |
2085 | } |
2086 | ||
2087 | ret = pthread_join(live_dispatcher_thread, &status); | |
178a0557 MD |
2088 | if (ret) { |
2089 | errno = ret; | |
d3e2ba59 | 2090 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2091 | retval = -1; |
d3e2ba59 JD |
2092 | } |
2093 | ||
178a0557 | 2094 | cleanup_relayd_live(); |
d3e2ba59 | 2095 | |
178a0557 | 2096 | return retval; |
d3e2ba59 JD |
2097 | } |
2098 | ||
2099 | /* | |
2100 | * main | |
2101 | */ | |
5a693d30 | 2102 | int relayd_live_create(struct lttng_uri *uri) |
d3e2ba59 | 2103 | { |
178a0557 | 2104 | int ret = 0, retval = 0; |
d3e2ba59 JD |
2105 | void *status; |
2106 | int is_root; | |
2107 | ||
178a0557 MD |
2108 | if (!uri) { |
2109 | retval = -1; | |
2110 | goto exit_init_data; | |
2111 | } | |
d3e2ba59 JD |
2112 | live_uri = uri; |
2113 | ||
d3e2ba59 JD |
2114 | /* Check if daemon is UID = 0 */ |
2115 | is_root = !getuid(); | |
2116 | ||
2117 | if (!is_root) { | |
2118 | if (live_uri->port < 1024) { | |
2119 | ERR("Need to be root to use ports < 1024"); | |
178a0557 MD |
2120 | retval = -1; |
2121 | goto exit_init_data; | |
d3e2ba59 JD |
2122 | } |
2123 | } | |
2124 | ||
2125 | /* Setup the thread apps communication pipe. */ | |
178a0557 MD |
2126 | if (create_conn_pipe()) { |
2127 | retval = -1; | |
2128 | goto exit_init_data; | |
d3e2ba59 JD |
2129 | } |
2130 | ||
2131 | /* Init relay command queue. */ | |
8bdee6e2 | 2132 | cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail); |
d3e2ba59 JD |
2133 | |
2134 | /* Set up max poll set size */ | |
25b397f9 MD |
2135 | if (lttng_poll_set_max_size()) { |
2136 | retval = -1; | |
2137 | goto exit_init_data; | |
2138 | } | |
d3e2ba59 JD |
2139 | |
2140 | /* Setup the dispatcher thread */ | |
2141 | ret = pthread_create(&live_dispatcher_thread, NULL, | |
2142 | thread_dispatcher, (void *) NULL); | |
178a0557 MD |
2143 | if (ret) { |
2144 | errno = ret; | |
d3e2ba59 | 2145 | PERROR("pthread_create viewer dispatcher"); |
178a0557 MD |
2146 | retval = -1; |
2147 | goto exit_dispatcher_thread; | |
d3e2ba59 JD |
2148 | } |
2149 | ||
2150 | /* Setup the worker thread */ | |
2151 | ret = pthread_create(&live_worker_thread, NULL, | |
5a693d30 | 2152 | thread_worker, NULL); |
178a0557 MD |
2153 | if (ret) { |
2154 | errno = ret; | |
d3e2ba59 | 2155 | PERROR("pthread_create viewer worker"); |
178a0557 MD |
2156 | retval = -1; |
2157 | goto exit_worker_thread; | |
d3e2ba59 JD |
2158 | } |
2159 | ||
2160 | /* Setup the listener thread */ | |
2161 | ret = pthread_create(&live_listener_thread, NULL, | |
2162 | thread_listener, (void *) NULL); | |
178a0557 MD |
2163 | if (ret) { |
2164 | errno = ret; | |
d3e2ba59 | 2165 | PERROR("pthread_create viewer listener"); |
178a0557 MD |
2166 | retval = -1; |
2167 | goto exit_listener_thread; | |
d3e2ba59 JD |
2168 | } |
2169 | ||
178a0557 MD |
2170 | /* |
2171 | * All OK, started all threads. | |
2172 | */ | |
2173 | return retval; | |
2174 | ||
9911d21b JG |
2175 | /* |
2176 | * Join on the live_listener_thread should anything be added after | |
2177 | * the live_listener thread's creation. | |
2178 | */ | |
d3e2ba59 | 2179 | |
178a0557 | 2180 | exit_listener_thread: |
d3e2ba59 | 2181 | |
d3e2ba59 | 2182 | ret = pthread_join(live_worker_thread, &status); |
178a0557 MD |
2183 | if (ret) { |
2184 | errno = ret; | |
d3e2ba59 | 2185 | PERROR("pthread_join live worker"); |
178a0557 | 2186 | retval = -1; |
d3e2ba59 | 2187 | } |
178a0557 | 2188 | exit_worker_thread: |
d3e2ba59 | 2189 | |
d3e2ba59 | 2190 | ret = pthread_join(live_dispatcher_thread, &status); |
178a0557 MD |
2191 | if (ret) { |
2192 | errno = ret; | |
d3e2ba59 | 2193 | PERROR("pthread_join live dispatcher"); |
178a0557 | 2194 | retval = -1; |
d3e2ba59 | 2195 | } |
178a0557 | 2196 | exit_dispatcher_thread: |
d3e2ba59 | 2197 | |
178a0557 MD |
2198 | exit_init_data: |
2199 | cleanup_relayd_live(); | |
d3e2ba59 | 2200 | |
178a0557 | 2201 | return retval; |
d3e2ba59 | 2202 | } |