Clean-up: move global sessiond symbols out of main.o
[lttng-tools.git] / src / bin / lttng-sessiond / kernel-consumer.c
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _LGPL_SOURCE
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <sys/stat.h>
22 #include <unistd.h>
23 #include <inttypes.h>
24
25 #include <common/common.h>
26 #include <common/defaults.h>
27 #include <common/compat/string.h>
28
29 #include "consumer.h"
30 #include "health-sessiond.h"
31 #include "kernel-consumer.h"
32 #include "notification-thread-commands.h"
33 #include "session.h"
34 #include "lttng-sessiond.h"
35
36 static char *create_channel_path(struct consumer_output *consumer,
37 uid_t uid, gid_t gid)
38 {
39 int ret;
40 char tmp_path[PATH_MAX];
41 char *pathname = NULL;
42
43 assert(consumer);
44
45 /* Get the right path name destination */
46 if (consumer->type == CONSUMER_DST_LOCAL) {
47 /* Set application path to the destination path */
48 ret = snprintf(tmp_path, sizeof(tmp_path), "%s%s%s",
49 consumer->dst.session_root_path,
50 consumer->chunk_path,
51 consumer->subdir);
52 if (ret < 0) {
53 PERROR("snprintf kernel channel path");
54 goto error;
55 } else if (ret >= sizeof(tmp_path)) {
56 ERR("Kernel channel path exceeds the maximal allowed length of of %zu bytes (%i bytes required) with path \"%s%s%s\"",
57 sizeof(tmp_path), ret,
58 consumer->dst.session_root_path,
59 consumer->chunk_path,
60 consumer->subdir);
61 goto error;
62 }
63 pathname = lttng_strndup(tmp_path, sizeof(tmp_path));
64 if (!pathname) {
65 PERROR("lttng_strndup");
66 goto error;
67 }
68
69 /* Create directory */
70 ret = run_as_mkdir_recursive(pathname, S_IRWXU | S_IRWXG, uid, gid);
71 if (ret < 0) {
72 if (errno != EEXIST) {
73 ERR("Trace directory creation error");
74 goto error;
75 }
76 }
77 DBG3("Kernel local consumer tracefile path: %s", pathname);
78 } else {
79 ret = snprintf(tmp_path, sizeof(tmp_path), "%s%s",
80 consumer->dst.net.base_dir,
81 consumer->subdir);
82 if (ret < 0) {
83 PERROR("snprintf kernel metadata path");
84 goto error;
85 } else if (ret >= sizeof(tmp_path)) {
86 ERR("Kernel channel path exceeds the maximal allowed length of of %zu bytes (%i bytes required) with path \"%s%s\"",
87 sizeof(tmp_path), ret,
88 consumer->dst.net.base_dir,
89 consumer->subdir);
90 goto error;
91 }
92 pathname = lttng_strndup(tmp_path, sizeof(tmp_path));
93 if (!pathname) {
94 PERROR("lttng_strndup");
95 goto error;
96 }
97 DBG3("Kernel network consumer subdir path: %s", pathname);
98 }
99
100 return pathname;
101
102 error:
103 free(pathname);
104 return NULL;
105 }
106
107 /*
108 * Sending a single channel to the consumer with command ADD_CHANNEL.
109 */
110 int kernel_consumer_add_channel(struct consumer_socket *sock,
111 struct ltt_kernel_channel *channel,
112 struct ltt_kernel_session *ksession,
113 unsigned int monitor)
114 {
115 int ret;
116 char *pathname;
117 struct lttcomm_consumer_msg lkm;
118 struct consumer_output *consumer;
119 enum lttng_error_code status;
120 struct ltt_session *session;
121 struct lttng_channel_extended *channel_attr_extended;
122
123 /* Safety net */
124 assert(channel);
125 assert(ksession);
126 assert(ksession->consumer);
127
128 consumer = ksession->consumer;
129 channel_attr_extended = (struct lttng_channel_extended *)
130 channel->channel->attr.extended.ptr;
131
132 DBG("Kernel consumer adding channel %s to kernel consumer",
133 channel->channel->name);
134
135 if (monitor) {
136 pathname = create_channel_path(consumer, ksession->uid,
137 ksession->gid);
138 } else {
139 /* Empty path. */
140 pathname = strdup("");
141 }
142 if (!pathname) {
143 ret = -1;
144 goto error;
145 }
146
147 /* Prep channel message structure */
148 consumer_init_add_channel_comm_msg(&lkm,
149 channel->key,
150 ksession->id,
151 pathname,
152 ksession->uid,
153 ksession->gid,
154 consumer->net_seq_index,
155 channel->channel->name,
156 channel->stream_count,
157 channel->channel->attr.output,
158 CONSUMER_CHANNEL_TYPE_DATA,
159 channel->channel->attr.tracefile_size,
160 channel->channel->attr.tracefile_count,
161 monitor,
162 channel->channel->attr.live_timer_interval,
163 channel_attr_extended->monitor_timer_interval);
164
165 health_code_update();
166
167 ret = consumer_send_channel(sock, &lkm);
168 if (ret < 0) {
169 goto error;
170 }
171
172 health_code_update();
173 rcu_read_lock();
174 session = session_find_by_id(ksession->id);
175 assert(session);
176 assert(pthread_mutex_trylock(&session->lock));
177 assert(session_trylock_list());
178
179 status = notification_thread_command_add_channel(
180 notification_thread_handle, session->name,
181 ksession->uid, ksession->gid,
182 channel->channel->name, channel->key,
183 LTTNG_DOMAIN_KERNEL,
184 channel->channel->attr.subbuf_size * channel->channel->attr.num_subbuf);
185 rcu_read_unlock();
186 if (status != LTTNG_OK) {
187 ret = -1;
188 goto error;
189 }
190
191 channel->published_to_notification_thread = true;
192
193 error:
194 free(pathname);
195 return ret;
196 }
197
198 /*
199 * Sending metadata to the consumer with command ADD_CHANNEL and ADD_STREAM.
200 *
201 * The consumer socket lock must be held by the caller.
202 */
203 int kernel_consumer_add_metadata(struct consumer_socket *sock,
204 struct ltt_kernel_session *ksession, unsigned int monitor)
205 {
206 int ret;
207 char *pathname;
208 struct lttcomm_consumer_msg lkm;
209 struct consumer_output *consumer;
210 struct ltt_session *session;
211
212 rcu_read_lock();
213
214 /* Safety net */
215 assert(ksession);
216 assert(ksession->consumer);
217 assert(sock);
218
219 DBG("Sending metadata %d to kernel consumer",
220 ksession->metadata_stream_fd);
221
222 /* Get consumer output pointer */
223 consumer = ksession->consumer;
224
225 if (monitor) {
226 pathname = create_channel_path(consumer,
227 ksession->uid, ksession->gid);
228 } else {
229 /* Empty path. */
230 pathname = strdup("");
231 }
232 if (!pathname) {
233 ret = -1;
234 goto error;
235 }
236
237 session = session_find_by_id(ksession->id);
238 assert(session);
239 assert(pthread_mutex_trylock(&session->lock));
240 assert(session_trylock_list());
241
242 /* Prep channel message structure */
243 consumer_init_add_channel_comm_msg(&lkm,
244 ksession->metadata->key,
245 ksession->id,
246 pathname,
247 ksession->uid,
248 ksession->gid,
249 consumer->net_seq_index,
250 DEFAULT_METADATA_NAME,
251 1,
252 DEFAULT_KERNEL_CHANNEL_OUTPUT,
253 CONSUMER_CHANNEL_TYPE_METADATA,
254 0, 0,
255 monitor, 0, 0);
256
257 health_code_update();
258
259 ret = consumer_send_channel(sock, &lkm);
260 if (ret < 0) {
261 goto error;
262 }
263
264 health_code_update();
265
266 /* Prep stream message structure */
267 consumer_init_add_stream_comm_msg(&lkm,
268 ksession->metadata->key,
269 ksession->metadata_stream_fd,
270 0 /* CPU: 0 for metadata. */,
271 session->current_archive_id);
272
273 health_code_update();
274
275 /* Send stream and file descriptor */
276 ret = consumer_send_stream(sock, consumer, &lkm,
277 &ksession->metadata_stream_fd, 1);
278 if (ret < 0) {
279 goto error;
280 }
281
282 health_code_update();
283
284 error:
285 rcu_read_unlock();
286 free(pathname);
287 return ret;
288 }
289
290 /*
291 * Sending a single stream to the consumer with command ADD_STREAM.
292 */
293 static
294 int kernel_consumer_add_stream(struct consumer_socket *sock,
295 struct ltt_kernel_channel *channel,
296 struct ltt_kernel_stream *stream,
297 struct ltt_kernel_session *session, unsigned int monitor,
298 uint64_t trace_archive_id)
299 {
300 int ret;
301 struct lttcomm_consumer_msg lkm;
302 struct consumer_output *consumer;
303
304 assert(channel);
305 assert(stream);
306 assert(session);
307 assert(session->consumer);
308 assert(sock);
309
310 DBG("Sending stream %d of channel %s to kernel consumer",
311 stream->fd, channel->channel->name);
312
313 /* Get consumer output pointer */
314 consumer = session->consumer;
315
316 /* Prep stream consumer message */
317 consumer_init_add_stream_comm_msg(&lkm,
318 channel->key,
319 stream->fd,
320 stream->cpu,
321 trace_archive_id);
322
323 health_code_update();
324
325 /* Send stream and file descriptor */
326 ret = consumer_send_stream(sock, consumer, &lkm, &stream->fd, 1);
327 if (ret < 0) {
328 goto error;
329 }
330
331 health_code_update();
332
333 error:
334 return ret;
335 }
336
337 /*
338 * Sending the notification that all streams were sent with STREAMS_SENT.
339 */
340 int kernel_consumer_streams_sent(struct consumer_socket *sock,
341 struct ltt_kernel_session *session, uint64_t channel_key)
342 {
343 int ret;
344 struct lttcomm_consumer_msg lkm;
345 struct consumer_output *consumer;
346
347 assert(sock);
348 assert(session);
349
350 DBG("Sending streams_sent");
351 /* Get consumer output pointer */
352 consumer = session->consumer;
353
354 /* Prep stream consumer message */
355 consumer_init_streams_sent_comm_msg(&lkm,
356 LTTNG_CONSUMER_STREAMS_SENT,
357 channel_key, consumer->net_seq_index);
358
359 health_code_update();
360
361 /* Send stream and file descriptor */
362 ret = consumer_send_msg(sock, &lkm);
363 if (ret < 0) {
364 goto error;
365 }
366
367 error:
368 return ret;
369 }
370
371 /*
372 * Send all stream fds of kernel channel to the consumer.
373 *
374 * The consumer socket lock must be held by the caller.
375 */
376 int kernel_consumer_send_channel_streams(struct consumer_socket *sock,
377 struct ltt_kernel_channel *channel, struct ltt_kernel_session *ksession,
378 unsigned int monitor)
379 {
380 int ret = LTTNG_OK;
381 struct ltt_kernel_stream *stream;
382 struct ltt_session *session;
383
384 /* Safety net */
385 assert(channel);
386 assert(ksession);
387 assert(ksession->consumer);
388 assert(sock);
389
390 rcu_read_lock();
391
392 session = session_find_by_id(ksession->id);
393 assert(session);
394 assert(pthread_mutex_trylock(&session->lock));
395 assert(session_trylock_list());
396
397 /* Bail out if consumer is disabled */
398 if (!ksession->consumer->enabled) {
399 ret = LTTNG_OK;
400 goto error;
401 }
402
403 DBG("Sending streams of channel %s to kernel consumer",
404 channel->channel->name);
405
406 if (!channel->sent_to_consumer) {
407 ret = kernel_consumer_add_channel(sock, channel, ksession, monitor);
408 if (ret < 0) {
409 goto error;
410 }
411 channel->sent_to_consumer = true;
412 }
413
414 /* Send streams */
415 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
416 if (!stream->fd || stream->sent_to_consumer) {
417 continue;
418 }
419
420 /* Add stream on the kernel consumer side. */
421 ret = kernel_consumer_add_stream(sock, channel, stream,
422 ksession, monitor, session->current_archive_id);
423 if (ret < 0) {
424 goto error;
425 }
426 stream->sent_to_consumer = true;
427 }
428
429 error:
430 rcu_read_unlock();
431 return ret;
432 }
433
434 /*
435 * Send all stream fds of the kernel session to the consumer.
436 *
437 * The consumer socket lock must be held by the caller.
438 */
439 int kernel_consumer_send_session(struct consumer_socket *sock,
440 struct ltt_kernel_session *session)
441 {
442 int ret, monitor = 0;
443 struct ltt_kernel_channel *chan;
444
445 /* Safety net */
446 assert(session);
447 assert(session->consumer);
448 assert(sock);
449
450 /* Bail out if consumer is disabled */
451 if (!session->consumer->enabled) {
452 ret = LTTNG_OK;
453 goto error;
454 }
455
456 /* Don't monitor the streams on the consumer if in flight recorder. */
457 if (session->output_traces) {
458 monitor = 1;
459 }
460
461 DBG("Sending session stream to kernel consumer");
462
463 if (session->metadata_stream_fd >= 0 && session->metadata) {
464 ret = kernel_consumer_add_metadata(sock, session, monitor);
465 if (ret < 0) {
466 goto error;
467 }
468 }
469
470 /* Send channel and streams of it */
471 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
472 ret = kernel_consumer_send_channel_streams(sock, chan, session,
473 monitor);
474 if (ret < 0) {
475 goto error;
476 }
477 if (monitor) {
478 /*
479 * Inform the relay that all the streams for the
480 * channel were sent.
481 */
482 ret = kernel_consumer_streams_sent(sock, session, chan->key);
483 if (ret < 0) {
484 goto error;
485 }
486 }
487 }
488
489 DBG("Kernel consumer FDs of metadata and channel streams sent");
490
491 session->consumer_fds_sent = 1;
492 return 0;
493
494 error:
495 return ret;
496 }
497
498 int kernel_consumer_destroy_channel(struct consumer_socket *socket,
499 struct ltt_kernel_channel *channel)
500 {
501 int ret;
502 struct lttcomm_consumer_msg msg;
503
504 assert(channel);
505 assert(socket);
506
507 DBG("Sending kernel consumer destroy channel key %" PRIu64, channel->key);
508
509 memset(&msg, 0, sizeof(msg));
510 msg.cmd_type = LTTNG_CONSUMER_DESTROY_CHANNEL;
511 msg.u.destroy_channel.key = channel->key;
512
513 pthread_mutex_lock(socket->lock);
514 health_code_update();
515
516 ret = consumer_send_msg(socket, &msg);
517 if (ret < 0) {
518 goto error;
519 }
520
521 error:
522 health_code_update();
523 pthread_mutex_unlock(socket->lock);
524 return ret;
525 }
526
527 int kernel_consumer_destroy_metadata(struct consumer_socket *socket,
528 struct ltt_kernel_metadata *metadata)
529 {
530 int ret;
531 struct lttcomm_consumer_msg msg;
532
533 assert(metadata);
534 assert(socket);
535
536 DBG("Sending kernel consumer destroy channel key %" PRIu64, metadata->key);
537
538 memset(&msg, 0, sizeof(msg));
539 msg.cmd_type = LTTNG_CONSUMER_DESTROY_CHANNEL;
540 msg.u.destroy_channel.key = metadata->key;
541
542 pthread_mutex_lock(socket->lock);
543 health_code_update();
544
545 ret = consumer_send_msg(socket, &msg);
546 if (ret < 0) {
547 goto error;
548 }
549
550 error:
551 health_code_update();
552 pthread_mutex_unlock(socket->lock);
553 return ret;
554 }
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