Fix: memory leak in add relayd socket error path
[lttng-tools.git] / src / common / consumer.c
CommitLineData
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1/*
2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
00e2e675 4 * 2012 - David Goulet <dgoulet@efficios.com>
3bd1e081 5 *
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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.
3bd1e081 9 *
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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.
3bd1e081 14 *
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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.
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18 */
19
20#define _GNU_SOURCE
21#include <assert.h>
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22#include <poll.h>
23#include <pthread.h>
24#include <stdlib.h>
25#include <string.h>
26#include <sys/mman.h>
27#include <sys/socket.h>
28#include <sys/types.h>
29#include <unistd.h>
77c7c900 30#include <inttypes.h>
3bd1e081 31
990570ed 32#include <common/common.h>
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33#include <common/utils.h>
34#include <common/compat/poll.h>
10a8a223 35#include <common/kernel-ctl/kernel-ctl.h>
00e2e675 36#include <common/sessiond-comm/relayd.h>
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37#include <common/sessiond-comm/sessiond-comm.h>
38#include <common/kernel-consumer/kernel-consumer.h>
00e2e675 39#include <common/relayd/relayd.h>
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40#include <common/ust-consumer/ust-consumer.h>
41
42#include "consumer.h"
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43
44struct lttng_consumer_global_data consumer_data = {
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45 .stream_count = 0,
46 .need_update = 1,
47 .type = LTTNG_CONSUMER_UNKNOWN,
48};
49
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50/*
51 * Flag to inform the polling thread to quit when all fd hung up. Updated by
52 * the consumer_thread_receive_fds when it notices that all fds has hung up.
53 * Also updated by the signal handler (consumer_should_exit()). Read by the
54 * polling threads.
55 */
a98dae5f 56volatile int consumer_quit;
3bd1e081 57
43c34bc3 58/*
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59 * Global hash table containing respectively metadata and data streams. The
60 * stream element in this ht should only be updated by the metadata poll thread
61 * for the metadata and the data poll thread for the data.
62 */
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63static struct lttng_ht *metadata_ht;
64static struct lttng_ht *data_ht;
43c34bc3 65
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66/*
67 * This hash table contains the mapping between the session id of the sessiond
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68 * and the relayd session id. Element of the ht are indexed by sessiond session
69 * id.
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70 *
71 * Node can be added when a relayd communication is opened in the sessiond
72 * thread.
73 *
74 * Note that a session id of the session daemon is unique to a tracing session
75 * and not to a domain session. However, a domain session has one consumer
76 * which forces the 1-1 mapping between a consumer and a domain session (ex:
77 * UST). This means that we can't have duplicate in this ht.
78 */
79static struct lttng_ht *relayd_session_id_ht;
80
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81/*
82 * Notify a thread pipe to poll back again. This usually means that some global
83 * state has changed so we just send back the thread in a poll wait call.
84 */
85static void notify_thread_pipe(int wpipe)
86{
87 int ret;
88
89 do {
90 struct lttng_consumer_stream *null_stream = NULL;
91
92 ret = write(wpipe, &null_stream, sizeof(null_stream));
93 } while (ret < 0 && errno == EINTR);
94}
95
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96/*
97 * Find a stream. The consumer_data.lock must be locked during this
98 * call.
99 */
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100static struct lttng_consumer_stream *consumer_find_stream(int key,
101 struct lttng_ht *ht)
3bd1e081 102{
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103 struct lttng_ht_iter iter;
104 struct lttng_ht_node_ulong *node;
105 struct lttng_consumer_stream *stream = NULL;
3bd1e081 106
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107 assert(ht);
108
7ad0a0cb 109 /* Negative keys are lookup failures */
7a57cf92 110 if (key < 0) {
7ad0a0cb 111 return NULL;
7a57cf92 112 }
e4421fec 113
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114 rcu_read_lock();
115
8389e4f8 116 lttng_ht_lookup(ht, (void *)((unsigned long) key), &iter);
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117 node = lttng_ht_iter_get_node_ulong(&iter);
118 if (node != NULL) {
119 stream = caa_container_of(node, struct lttng_consumer_stream, node);
3bd1e081 120 }
e4421fec 121
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122 rcu_read_unlock();
123
e4421fec 124 return stream;
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125}
126
c869f647 127void consumer_steal_stream_key(int key, struct lttng_ht *ht)
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128{
129 struct lttng_consumer_stream *stream;
130
04253271 131 rcu_read_lock();
8389e4f8 132 stream = consumer_find_stream(key, ht);
04253271 133 if (stream) {
7ad0a0cb 134 stream->key = -1;
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135 /*
136 * We don't want the lookup to match, but we still need
137 * to iterate on this stream when iterating over the hash table. Just
138 * change the node key.
139 */
140 stream->node.key = -1;
141 }
142 rcu_read_unlock();
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143}
144
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145/*
146 * Return a channel object for the given key.
147 *
148 * RCU read side lock MUST be acquired before calling this function and
149 * protects the channel ptr.
150 */
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151static struct lttng_consumer_channel *consumer_find_channel(int key)
152{
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153 struct lttng_ht_iter iter;
154 struct lttng_ht_node_ulong *node;
155 struct lttng_consumer_channel *channel = NULL;
3bd1e081 156
7ad0a0cb 157 /* Negative keys are lookup failures */
7a57cf92 158 if (key < 0) {
7ad0a0cb 159 return NULL;
7a57cf92 160 }
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161
162 lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key),
163 &iter);
164 node = lttng_ht_iter_get_node_ulong(&iter);
165 if (node != NULL) {
166 channel = caa_container_of(node, struct lttng_consumer_channel, node);
3bd1e081 167 }
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168
169 return channel;
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170}
171
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172static void consumer_steal_channel_key(int key)
173{
174 struct lttng_consumer_channel *channel;
175
04253271 176 rcu_read_lock();
7ad0a0cb 177 channel = consumer_find_channel(key);
04253271 178 if (channel) {
7ad0a0cb 179 channel->key = -1;
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180 /*
181 * We don't want the lookup to match, but we still need
182 * to iterate on this channel when iterating over the hash table. Just
183 * change the node key.
184 */
185 channel->node.key = -1;
186 }
187 rcu_read_unlock();
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188}
189
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190static
191void consumer_free_stream(struct rcu_head *head)
192{
193 struct lttng_ht_node_ulong *node =
194 caa_container_of(head, struct lttng_ht_node_ulong, head);
195 struct lttng_consumer_stream *stream =
196 caa_container_of(node, struct lttng_consumer_stream, node);
197
198 free(stream);
199}
200
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201/*
202 * RCU protected relayd socket pair free.
203 */
204static void consumer_rcu_free_relayd(struct rcu_head *head)
205{
206 struct lttng_ht_node_ulong *node =
207 caa_container_of(head, struct lttng_ht_node_ulong, head);
208 struct consumer_relayd_sock_pair *relayd =
209 caa_container_of(node, struct consumer_relayd_sock_pair, node);
210
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211 /*
212 * Close all sockets. This is done in the call RCU since we don't want the
213 * socket fds to be reassigned thus potentially creating bad state of the
214 * relayd object.
215 *
216 * We do not have to lock the control socket mutex here since at this stage
217 * there is no one referencing to this relayd object.
218 */
219 (void) relayd_close(&relayd->control_sock);
220 (void) relayd_close(&relayd->data_sock);
221
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222 free(relayd);
223}
224
225/*
226 * Destroy and free relayd socket pair object.
227 *
228 * This function MUST be called with the consumer_data lock acquired.
229 */
d09e1200 230static void destroy_relayd(struct consumer_relayd_sock_pair *relayd)
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231{
232 int ret;
233 struct lttng_ht_iter iter;
46e6455f 234 struct lttng_ht_node_ulong *node;
00e2e675 235
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236 if (relayd == NULL) {
237 return;
238 }
239
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240 DBG("Consumer destroy and close relayd socket pair");
241
f7079f67 242 /* Loockup for a relayd node in the session id map hash table. */
46e6455f 243 lttng_ht_lookup(relayd_session_id_ht,
f7079f67 244 (void *)((unsigned long) relayd->sessiond_session_id), &iter);
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245 node = lttng_ht_iter_get_node_ulong(&iter);
246 if (node != NULL) {
247 /* We assume the relayd is being or is destroyed */
248 return;
249 }
250
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251 /*
252 * Try to delete it from the relayd session id ht. The return value is of
253 * no importance since either way we are going to try to delete the relayd
254 * from the global relayd_ht.
255 */
256 lttng_ht_del(relayd_session_id_ht, &iter);
46e6455f 257
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258 iter.iter.node = &relayd->node.node;
259 ret = lttng_ht_del(consumer_data.relayd_ht, &iter);
173af62f 260 if (ret != 0) {
8994307f 261 /* We assume the relayd is being or is destroyed */
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262 return;
263 }
00e2e675 264
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265 /* RCU free() call */
266 call_rcu(&relayd->node.head, consumer_rcu_free_relayd);
267}
268
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269/*
270 * Iterate over the relayd hash table and destroy each element. Finally,
271 * destroy the whole hash table.
272 */
273static void cleanup_relayd_ht(void)
274{
275 struct lttng_ht_iter iter;
276 struct consumer_relayd_sock_pair *relayd;
277
278 rcu_read_lock();
279
280 cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd,
281 node.node) {
282 destroy_relayd(relayd);
283 }
284
285 lttng_ht_destroy(consumer_data.relayd_ht);
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286 /* The destroy_relayd call makes sure that this ht is empty here. */
287 lttng_ht_destroy(relayd_session_id_ht);
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288
289 rcu_read_unlock();
290}
291
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292/*
293 * Update the end point status of all streams having the given network sequence
294 * index (relayd index).
295 *
296 * It's atomically set without having the stream mutex locked which is fine
297 * because we handle the write/read race with a pipe wakeup for each thread.
298 */
299static void update_endpoint_status_by_netidx(int net_seq_idx,
300 enum consumer_endpoint_status status)
301{
302 struct lttng_ht_iter iter;
303 struct lttng_consumer_stream *stream;
304
305 DBG("Consumer set delete flag on stream by idx %d", net_seq_idx);
306
307 rcu_read_lock();
308
309 /* Let's begin with metadata */
310 cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) {
311 if (stream->net_seq_idx == net_seq_idx) {
312 uatomic_set(&stream->endpoint_status, status);
313 DBG("Delete flag set to metadata stream %d", stream->wait_fd);
314 }
315 }
316
317 /* Follow up by the data streams */
318 cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) {
319 if (stream->net_seq_idx == net_seq_idx) {
320 uatomic_set(&stream->endpoint_status, status);
321 DBG("Delete flag set to data stream %d", stream->wait_fd);
322 }
323 }
324 rcu_read_unlock();
325}
326
327/*
328 * Cleanup a relayd object by flagging every associated streams for deletion,
329 * destroying the object meaning removing it from the relayd hash table,
330 * closing the sockets and freeing the memory in a RCU call.
331 *
332 * If a local data context is available, notify the threads that the streams'
333 * state have changed.
334 */
335static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd,
336 struct lttng_consumer_local_data *ctx)
337{
338 int netidx;
339
340 assert(relayd);
341
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342 DBG("Cleaning up relayd sockets");
343
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344 /* Save the net sequence index before destroying the object */
345 netidx = relayd->net_seq_idx;
346
347 /*
348 * Delete the relayd from the relayd hash table, close the sockets and free
349 * the object in a RCU call.
350 */
351 destroy_relayd(relayd);
352
353 /* Set inactive endpoint to all streams */
354 update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE);
355
356 /*
357 * With a local data context, notify the threads that the streams' state
358 * have changed. The write() action on the pipe acts as an "implicit"
359 * memory barrier ordering the updates of the end point status from the
360 * read of this status which happens AFTER receiving this notify.
361 */
362 if (ctx) {
363 notify_thread_pipe(ctx->consumer_data_pipe[1]);
364 notify_thread_pipe(ctx->consumer_metadata_pipe[1]);
365 }
366}
367
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368/*
369 * Flag a relayd socket pair for destruction. Destroy it if the refcount
370 * reaches zero.
371 *
372 * RCU read side lock MUST be aquired before calling this function.
373 */
374void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd)
375{
376 assert(relayd);
377
378 /* Set destroy flag for this object */
379 uatomic_set(&relayd->destroy_flag, 1);
380
381 /* Destroy the relayd if refcount is 0 */
382 if (uatomic_read(&relayd->refcount) == 0) {
d09e1200 383 destroy_relayd(relayd);
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384 }
385}
386
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387/*
388 * Remove a stream from the global list protected by a mutex. This
389 * function is also responsible for freeing its data structures.
390 */
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391void consumer_del_stream(struct lttng_consumer_stream *stream,
392 struct lttng_ht *ht)
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393{
394 int ret;
e4421fec 395 struct lttng_ht_iter iter;
3bd1e081 396 struct lttng_consumer_channel *free_chan = NULL;
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397 struct consumer_relayd_sock_pair *relayd;
398
399 assert(stream);
3bd1e081 400
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401 DBG("Consumer del stream %d", stream->wait_fd);
402
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403 if (ht == NULL) {
404 /* Means the stream was allocated but not successfully added */
405 goto free_stream;
406 }
407
3bd1e081 408 pthread_mutex_lock(&consumer_data.lock);
74251bb8 409 pthread_mutex_lock(&stream->lock);
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410
411 switch (consumer_data.type) {
412 case LTTNG_CONSUMER_KERNEL:
413 if (stream->mmap_base != NULL) {
414 ret = munmap(stream->mmap_base, stream->mmap_len);
415 if (ret != 0) {
7a57cf92 416 PERROR("munmap");
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417 }
418 }
419 break;
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420 case LTTNG_CONSUMER32_UST:
421 case LTTNG_CONSUMER64_UST:
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422 lttng_ustconsumer_del_stream(stream);
423 break;
424 default:
425 ERR("Unknown consumer_data type");
426 assert(0);
427 goto end;
428 }
429
6065ceec 430 rcu_read_lock();
04253271 431 iter.iter.node = &stream->node.node;
e316aad5 432 ret = lttng_ht_del(ht, &iter);
04253271 433 assert(!ret);
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434
435 /* Remove node session id from the consumer_data stream ht */
436 iter.iter.node = &stream->node_session_id.node;
437 ret = lttng_ht_del(consumer_data.stream_list_ht, &iter);
438 assert(!ret);
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439 rcu_read_unlock();
440
50f8ae69 441 assert(consumer_data.stream_count > 0);
3bd1e081 442 consumer_data.stream_count--;
50f8ae69 443
3bd1e081 444 if (stream->out_fd >= 0) {
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445 ret = close(stream->out_fd);
446 if (ret) {
447 PERROR("close");
448 }
3bd1e081 449 }
b5c5fc29 450 if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) {
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451 ret = close(stream->wait_fd);
452 if (ret) {
453 PERROR("close");
454 }
3bd1e081 455 }
2c1dd183 456 if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) {
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457 ret = close(stream->shm_fd);
458 if (ret) {
459 PERROR("close");
460 }
3bd1e081 461 }
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462
463 /* Check and cleanup relayd */
b0b335c8 464 rcu_read_lock();
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465 relayd = consumer_find_relayd(stream->net_seq_idx);
466 if (relayd != NULL) {
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467 uatomic_dec(&relayd->refcount);
468 assert(uatomic_read(&relayd->refcount) >= 0);
173af62f 469
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470 /* Closing streams requires to lock the control socket. */
471 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
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472 ret = relayd_send_close_stream(&relayd->control_sock,
473 stream->relayd_stream_id,
474 stream->next_net_seq_num - 1);
3f8e211f 475 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
173af62f 476 if (ret < 0) {
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477 DBG("Unable to close stream on the relayd. Continuing");
478 /*
479 * Continue here. There is nothing we can do for the relayd.
480 * Chances are that the relayd has closed the socket so we just
481 * continue cleaning up.
482 */
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483 }
484
485 /* Both conditions are met, we destroy the relayd. */
486 if (uatomic_read(&relayd->refcount) == 0 &&
487 uatomic_read(&relayd->destroy_flag)) {
d09e1200 488 destroy_relayd(relayd);
00e2e675 489 }
00e2e675 490 }
b0b335c8 491 rcu_read_unlock();
00e2e675 492
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493 uatomic_dec(&stream->chan->refcount);
494 if (!uatomic_read(&stream->chan->refcount)
495 && !uatomic_read(&stream->chan->nb_init_streams)) {
3bd1e081 496 free_chan = stream->chan;
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497 }
498
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499end:
500 consumer_data.need_update = 1;
8994307f 501 pthread_mutex_unlock(&stream->lock);
74251bb8 502 pthread_mutex_unlock(&consumer_data.lock);
3bd1e081 503
c30aaa51 504 if (free_chan) {
3bd1e081 505 consumer_del_channel(free_chan);
c30aaa51 506 }
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507
508free_stream:
509 call_rcu(&stream->node.head, consumer_free_stream);
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510}
511
512struct lttng_consumer_stream *consumer_allocate_stream(
513 int channel_key, int stream_key,
514 int shm_fd, int wait_fd,
515 enum lttng_consumer_stream_state state,
516 uint64_t mmap_len,
517 enum lttng_event_output output,
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518 const char *path_name,
519 uid_t uid,
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520 gid_t gid,
521 int net_index,
c80048c6 522 int metadata_flag,
53632229 523 uint64_t session_id,
c80048c6 524 int *alloc_ret)
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525{
526 struct lttng_consumer_stream *stream;
3bd1e081 527
effcf122 528 stream = zmalloc(sizeof(*stream));
3bd1e081 529 if (stream == NULL) {
7a57cf92 530 PERROR("malloc struct lttng_consumer_stream");
c80048c6 531 *alloc_ret = -ENOMEM;
7a57cf92 532 goto end;
3bd1e081 533 }
7a57cf92 534
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535 rcu_read_lock();
536
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537 /*
538 * Get stream's channel reference. Needed when adding the stream to the
539 * global hash table.
540 */
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541 stream->chan = consumer_find_channel(channel_key);
542 if (!stream->chan) {
c80048c6 543 *alloc_ret = -ENOENT;
7a57cf92 544 ERR("Unable to find channel for stream %d", stream_key);
c80048c6 545 goto error;
3bd1e081 546 }
e316aad5 547
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548 stream->key = stream_key;
549 stream->shm_fd = shm_fd;
550 stream->wait_fd = wait_fd;
551 stream->out_fd = -1;
552 stream->out_fd_offset = 0;
553 stream->state = state;
554 stream->mmap_len = mmap_len;
555 stream->mmap_base = NULL;
556 stream->output = output;
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557 stream->uid = uid;
558 stream->gid = gid;
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559 stream->net_seq_idx = net_index;
560 stream->metadata_flag = metadata_flag;
53632229 561 stream->session_id = session_id;
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562 strncpy(stream->path_name, path_name, sizeof(stream->path_name));
563 stream->path_name[sizeof(stream->path_name) - 1] = '\0';
53632229 564 pthread_mutex_init(&stream->lock, NULL);
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565
566 /*
567 * Index differently the metadata node because the thread is using an
568 * internal hash table to match streams in the metadata_ht to the epoll set
569 * file descriptor.
570 */
571 if (metadata_flag) {
572 lttng_ht_node_init_ulong(&stream->node, stream->wait_fd);
573 } else {
574 lttng_ht_node_init_ulong(&stream->node, stream->key);
575 }
c30aaa51 576
53632229
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577 /* Init session id node with the stream session id */
578 lttng_ht_node_init_ulong(&stream->node_session_id, stream->session_id);
579
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580 /*
581 * The cpu number is needed before using any ustctl_* actions. Ignored for
582 * the kernel so the value does not matter.
583 */
584 pthread_mutex_lock(&consumer_data.lock);
585 stream->cpu = stream->chan->cpucount++;
586 pthread_mutex_unlock(&consumer_data.lock);
587
c30aaa51 588 DBG3("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu,"
53632229
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589 " out_fd %d, net_seq_idx %d, session_id %" PRIu64,
590 stream->path_name, stream->key, stream->shm_fd, stream->wait_fd,
c30aaa51 591 (unsigned long long) stream->mmap_len, stream->out_fd,
53632229 592 stream->net_seq_idx, stream->session_id);
d56db448
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593
594 rcu_read_unlock();
3bd1e081 595 return stream;
c80048c6
MD
596
597error:
d56db448 598 rcu_read_unlock();
c80048c6 599 free(stream);
7a57cf92 600end:
c80048c6 601 return NULL;
3bd1e081
MD
602}
603
604/*
605 * Add a stream to the global list protected by a mutex.
606 */
43c34bc3
DG
607static int consumer_add_stream(struct lttng_consumer_stream *stream,
608 struct lttng_ht *ht)
3bd1e081
MD
609{
610 int ret = 0;
00e2e675 611 struct consumer_relayd_sock_pair *relayd;
3bd1e081 612
e316aad5 613 assert(stream);
43c34bc3 614 assert(ht);
c77fc10a 615
e316aad5
DG
616 DBG3("Adding consumer stream %d", stream->key);
617
618 pthread_mutex_lock(&consumer_data.lock);
2e818a6a 619 pthread_mutex_lock(&stream->lock);
b0b335c8 620 rcu_read_lock();
e316aad5 621
43c34bc3
DG
622 /* Steal stream identifier to avoid having streams with the same key */
623 consumer_steal_stream_key(stream->key, ht);
624
625 lttng_ht_add_unique_ulong(ht, &stream->node);
00e2e675 626
ca22feea
DG
627 /*
628 * Add stream to the stream_list_ht of the consumer data. No need to steal
629 * the key since the HT does not use it and we allow to add redundant keys
630 * into this table.
631 */
632 lttng_ht_add_ulong(consumer_data.stream_list_ht, &stream->node_session_id);
633
00e2e675
DG
634 /* Check and cleanup relayd */
635 relayd = consumer_find_relayd(stream->net_seq_idx);
636 if (relayd != NULL) {
b0b335c8 637 uatomic_inc(&relayd->refcount);
00e2e675
DG
638 }
639
e316aad5
DG
640 /* Update channel refcount once added without error(s). */
641 uatomic_inc(&stream->chan->refcount);
642
643 /*
644 * When nb_init_streams reaches 0, we don't need to trigger any action in
645 * terms of destroying the associated channel, because the action that
646 * causes the count to become 0 also causes a stream to be added. The
647 * channel deletion will thus be triggered by the following removal of this
648 * stream.
649 */
650 if (uatomic_read(&stream->chan->nb_init_streams) > 0) {
651 uatomic_dec(&stream->chan->nb_init_streams);
652 }
653
654 /* Update consumer data once the node is inserted. */
3bd1e081
MD
655 consumer_data.stream_count++;
656 consumer_data.need_update = 1;
657
e316aad5 658 rcu_read_unlock();
2e818a6a 659 pthread_mutex_unlock(&stream->lock);
3bd1e081 660 pthread_mutex_unlock(&consumer_data.lock);
702b1ea4 661
3bd1e081
MD
662 return ret;
663}
664
00e2e675 665/*
3f8e211f
DG
666 * Add relayd socket to global consumer data hashtable. RCU read side lock MUST
667 * be acquired before calling this.
00e2e675 668 */
d09e1200 669static int add_relayd(struct consumer_relayd_sock_pair *relayd)
00e2e675
DG
670{
671 int ret = 0;
672 struct lttng_ht_node_ulong *node;
673 struct lttng_ht_iter iter;
674
675 if (relayd == NULL) {
676 ret = -1;
677 goto end;
678 }
679
00e2e675
DG
680 lttng_ht_lookup(consumer_data.relayd_ht,
681 (void *)((unsigned long) relayd->net_seq_idx), &iter);
682 node = lttng_ht_iter_get_node_ulong(&iter);
683 if (node != NULL) {
00e2e675
DG
684 /* Relayd already exist. Ignore the insertion */
685 goto end;
686 }
687 lttng_ht_add_unique_ulong(consumer_data.relayd_ht, &relayd->node);
688
00e2e675
DG
689end:
690 return ret;
691}
692
693/*
694 * Allocate and return a consumer relayd socket.
695 */
696struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair(
697 int net_seq_idx)
698{
699 struct consumer_relayd_sock_pair *obj = NULL;
700
701 /* Negative net sequence index is a failure */
702 if (net_seq_idx < 0) {
703 goto error;
704 }
705
706 obj = zmalloc(sizeof(struct consumer_relayd_sock_pair));
707 if (obj == NULL) {
708 PERROR("zmalloc relayd sock");
709 goto error;
710 }
711
712 obj->net_seq_idx = net_seq_idx;
713 obj->refcount = 0;
173af62f 714 obj->destroy_flag = 0;
00e2e675
DG
715 lttng_ht_node_init_ulong(&obj->node, obj->net_seq_idx);
716 pthread_mutex_init(&obj->ctrl_sock_mutex, NULL);
717
718error:
719 return obj;
720}
721
722/*
723 * Find a relayd socket pair in the global consumer data.
724 *
725 * Return the object if found else NULL.
b0b335c8
MD
726 * RCU read-side lock must be held across this call and while using the
727 * returned object.
00e2e675
DG
728 */
729struct consumer_relayd_sock_pair *consumer_find_relayd(int key)
730{
731 struct lttng_ht_iter iter;
732 struct lttng_ht_node_ulong *node;
733 struct consumer_relayd_sock_pair *relayd = NULL;
734
735 /* Negative keys are lookup failures */
736 if (key < 0) {
737 goto error;
738 }
739
00e2e675
DG
740 lttng_ht_lookup(consumer_data.relayd_ht, (void *)((unsigned long) key),
741 &iter);
742 node = lttng_ht_iter_get_node_ulong(&iter);
743 if (node != NULL) {
744 relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node);
745 }
746
00e2e675
DG
747error:
748 return relayd;
749}
750
751/*
752 * Handle stream for relayd transmission if the stream applies for network
753 * streaming where the net sequence index is set.
754 *
755 * Return destination file descriptor or negative value on error.
756 */
6197aea7 757static int write_relayd_stream_header(struct lttng_consumer_stream *stream,
1d4dfdef
DG
758 size_t data_size, unsigned long padding,
759 struct consumer_relayd_sock_pair *relayd)
00e2e675
DG
760{
761 int outfd = -1, ret;
00e2e675
DG
762 struct lttcomm_relayd_data_hdr data_hdr;
763
764 /* Safety net */
765 assert(stream);
6197aea7 766 assert(relayd);
00e2e675
DG
767
768 /* Reset data header */
769 memset(&data_hdr, 0, sizeof(data_hdr));
770
00e2e675
DG
771 if (stream->metadata_flag) {
772 /* Caller MUST acquire the relayd control socket lock */
773 ret = relayd_send_metadata(&relayd->control_sock, data_size);
774 if (ret < 0) {
775 goto error;
776 }
777
778 /* Metadata are always sent on the control socket. */
779 outfd = relayd->control_sock.fd;
780 } else {
781 /* Set header with stream information */
782 data_hdr.stream_id = htobe64(stream->relayd_stream_id);
783 data_hdr.data_size = htobe32(data_size);
1d4dfdef 784 data_hdr.padding_size = htobe32(padding);
173af62f 785 data_hdr.net_seq_num = htobe64(stream->next_net_seq_num++);
00e2e675
DG
786 /* Other fields are zeroed previously */
787
788 ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr,
789 sizeof(data_hdr));
790 if (ret < 0) {
791 goto error;
792 }
793
794 /* Set to go on data socket */
795 outfd = relayd->data_sock.fd;
796 }
797
798error:
799 return outfd;
800}
801
702b1ea4
MD
802static
803void consumer_free_channel(struct rcu_head *head)
804{
805 struct lttng_ht_node_ulong *node =
806 caa_container_of(head, struct lttng_ht_node_ulong, head);
807 struct lttng_consumer_channel *channel =
808 caa_container_of(node, struct lttng_consumer_channel, node);
809
810 free(channel);
811}
812
3bd1e081
MD
813/*
814 * Remove a channel from the global list protected by a mutex. This
815 * function is also responsible for freeing its data structures.
816 */
817void consumer_del_channel(struct lttng_consumer_channel *channel)
818{
819 int ret;
e4421fec 820 struct lttng_ht_iter iter;
3bd1e081 821
5c540210
DG
822 DBG("Consumer delete channel key %d", channel->key);
823
3bd1e081
MD
824 pthread_mutex_lock(&consumer_data.lock);
825
826 switch (consumer_data.type) {
827 case LTTNG_CONSUMER_KERNEL:
828 break;
7753dea8
MD
829 case LTTNG_CONSUMER32_UST:
830 case LTTNG_CONSUMER64_UST:
3bd1e081
MD
831 lttng_ustconsumer_del_channel(channel);
832 break;
833 default:
834 ERR("Unknown consumer_data type");
835 assert(0);
836 goto end;
837 }
838
6065ceec 839 rcu_read_lock();
04253271
MD
840 iter.iter.node = &channel->node.node;
841 ret = lttng_ht_del(consumer_data.channel_ht, &iter);
842 assert(!ret);
6065ceec
DG
843 rcu_read_unlock();
844
3bd1e081
MD
845 if (channel->mmap_base != NULL) {
846 ret = munmap(channel->mmap_base, channel->mmap_len);
847 if (ret != 0) {
7a57cf92 848 PERROR("munmap");
3bd1e081
MD
849 }
850 }
b5c5fc29 851 if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) {
4c462e79
MD
852 ret = close(channel->wait_fd);
853 if (ret) {
854 PERROR("close");
855 }
3bd1e081 856 }
2c1dd183 857 if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) {
4c462e79
MD
858 ret = close(channel->shm_fd);
859 if (ret) {
860 PERROR("close");
861 }
3bd1e081 862 }
702b1ea4
MD
863
864 call_rcu(&channel->node.head, consumer_free_channel);
3bd1e081
MD
865end:
866 pthread_mutex_unlock(&consumer_data.lock);
867}
868
869struct lttng_consumer_channel *consumer_allocate_channel(
870 int channel_key,
871 int shm_fd, int wait_fd,
872 uint64_t mmap_len,
c30aaa51
MD
873 uint64_t max_sb_size,
874 unsigned int nb_init_streams)
3bd1e081
MD
875{
876 struct lttng_consumer_channel *channel;
877 int ret;
878
276b26d1 879 channel = zmalloc(sizeof(*channel));
3bd1e081 880 if (channel == NULL) {
7a57cf92 881 PERROR("malloc struct lttng_consumer_channel");
3bd1e081
MD
882 goto end;
883 }
884 channel->key = channel_key;
885 channel->shm_fd = shm_fd;
886 channel->wait_fd = wait_fd;
887 channel->mmap_len = mmap_len;
888 channel->max_sb_size = max_sb_size;
889 channel->refcount = 0;
c30aaa51 890 channel->nb_init_streams = nb_init_streams;
e4421fec 891 lttng_ht_node_init_ulong(&channel->node, channel->key);
3bd1e081
MD
892
893 switch (consumer_data.type) {
894 case LTTNG_CONSUMER_KERNEL:
895 channel->mmap_base = NULL;
896 channel->mmap_len = 0;
897 break;
7753dea8
MD
898 case LTTNG_CONSUMER32_UST:
899 case LTTNG_CONSUMER64_UST:
3bd1e081
MD
900 ret = lttng_ustconsumer_allocate_channel(channel);
901 if (ret) {
902 free(channel);
903 return NULL;
904 }
905 break;
906 default:
907 ERR("Unknown consumer_data type");
908 assert(0);
909 goto end;
910 }
911 DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)",
00e2e675 912 channel->key, channel->shm_fd, channel->wait_fd,
3bd1e081
MD
913 (unsigned long long) channel->mmap_len,
914 (unsigned long long) channel->max_sb_size);
915end:
916 return channel;
917}
918
919/*
920 * Add a channel to the global list protected by a mutex.
921 */
922int consumer_add_channel(struct lttng_consumer_channel *channel)
923{
c77fc10a
DG
924 struct lttng_ht_node_ulong *node;
925 struct lttng_ht_iter iter;
926
3bd1e081 927 pthread_mutex_lock(&consumer_data.lock);
7ad0a0cb
MD
928 /* Steal channel identifier, for UST */
929 consumer_steal_channel_key(channel->key);
6065ceec 930 rcu_read_lock();
c77fc10a
DG
931
932 lttng_ht_lookup(consumer_data.channel_ht,
933 (void *)((unsigned long) channel->key), &iter);
934 node = lttng_ht_iter_get_node_ulong(&iter);
935 if (node != NULL) {
936 /* Channel already exist. Ignore the insertion */
937 goto end;
938 }
939
04253271 940 lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node);
c77fc10a
DG
941
942end:
6065ceec 943 rcu_read_unlock();
3bd1e081 944 pthread_mutex_unlock(&consumer_data.lock);
702b1ea4 945
7ad0a0cb 946 return 0;
3bd1e081
MD
947}
948
949/*
950 * Allocate the pollfd structure and the local view of the out fds to avoid
951 * doing a lookup in the linked list and concurrency issues when writing is
952 * needed. Called with consumer_data.lock held.
953 *
954 * Returns the number of fds in the structures.
955 */
43c34bc3 956static int consumer_update_poll_array(
3bd1e081 957 struct lttng_consumer_local_data *ctx, struct pollfd **pollfd,
43c34bc3 958 struct lttng_consumer_stream **local_stream, struct lttng_ht *ht)
3bd1e081 959{
3bd1e081 960 int i = 0;
e4421fec
DG
961 struct lttng_ht_iter iter;
962 struct lttng_consumer_stream *stream;
3bd1e081
MD
963
964 DBG("Updating poll fd array");
481d6c57 965 rcu_read_lock();
43c34bc3 966 cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) {
8994307f
DG
967 /*
968 * Only active streams with an active end point can be added to the
969 * poll set and local stream storage of the thread.
970 *
971 * There is a potential race here for endpoint_status to be updated
972 * just after the check. However, this is OK since the stream(s) will
973 * be deleted once the thread is notified that the end point state has
974 * changed where this function will be called back again.
975 */
976 if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM ||
79d4ffb7 977 stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) {
3bd1e081
MD
978 continue;
979 }
e4421fec
DG
980 DBG("Active FD %d", stream->wait_fd);
981 (*pollfd)[i].fd = stream->wait_fd;
3bd1e081 982 (*pollfd)[i].events = POLLIN | POLLPRI;
e4421fec 983 local_stream[i] = stream;
3bd1e081
MD
984 i++;
985 }
481d6c57 986 rcu_read_unlock();
3bd1e081
MD
987
988 /*
50f8ae69 989 * Insert the consumer_data_pipe at the end of the array and don't
3bd1e081
MD
990 * increment i so nb_fd is the number of real FD.
991 */
50f8ae69 992 (*pollfd)[i].fd = ctx->consumer_data_pipe[0];
509bb1cf 993 (*pollfd)[i].events = POLLIN | POLLPRI;
3bd1e081
MD
994 return i;
995}
996
997/*
998 * Poll on the should_quit pipe and the command socket return -1 on error and
999 * should exit, 0 if data is available on the command socket
1000 */
1001int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll)
1002{
1003 int num_rdy;
1004
88f2b785 1005restart:
3bd1e081
MD
1006 num_rdy = poll(consumer_sockpoll, 2, -1);
1007 if (num_rdy == -1) {
88f2b785
MD
1008 /*
1009 * Restart interrupted system call.
1010 */
1011 if (errno == EINTR) {
1012 goto restart;
1013 }
7a57cf92 1014 PERROR("Poll error");
3bd1e081
MD
1015 goto exit;
1016 }
509bb1cf 1017 if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) {
3bd1e081
MD
1018 DBG("consumer_should_quit wake up");
1019 goto exit;
1020 }
1021 return 0;
1022
1023exit:
1024 return -1;
1025}
1026
1027/*
1028 * Set the error socket.
1029 */
1030void lttng_consumer_set_error_sock(
1031 struct lttng_consumer_local_data *ctx, int sock)
1032{
1033 ctx->consumer_error_socket = sock;
1034}
1035
1036/*
1037 * Set the command socket path.
1038 */
3bd1e081
MD
1039void lttng_consumer_set_command_sock_path(
1040 struct lttng_consumer_local_data *ctx, char *sock)
1041{
1042 ctx->consumer_command_sock_path = sock;
1043}
1044
1045/*
1046 * Send return code to the session daemon.
1047 * If the socket is not defined, we return 0, it is not a fatal error
1048 */
1049int lttng_consumer_send_error(
1050 struct lttng_consumer_local_data *ctx, int cmd)
1051{
1052 if (ctx->consumer_error_socket > 0) {
1053 return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd,
1054 sizeof(enum lttcomm_sessiond_command));
1055 }
1056
1057 return 0;
1058}
1059
1060/*
228b5bf7
DG
1061 * Close all the tracefiles and stream fds and MUST be called when all
1062 * instances are destroyed i.e. when all threads were joined and are ended.
3bd1e081
MD
1063 */
1064void lttng_consumer_cleanup(void)
1065{
e4421fec 1066 struct lttng_ht_iter iter;
6065ceec
DG
1067 struct lttng_ht_node_ulong *node;
1068
1069 rcu_read_lock();
3bd1e081 1070
6065ceec
DG
1071 cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node,
1072 node) {
702b1ea4
MD
1073 struct lttng_consumer_channel *channel =
1074 caa_container_of(node, struct lttng_consumer_channel, node);
1075 consumer_del_channel(channel);
3bd1e081 1076 }
6065ceec
DG
1077
1078 rcu_read_unlock();
d6ce1df2 1079
d6ce1df2 1080 lttng_ht_destroy(consumer_data.channel_ht);
228b5bf7
DG
1081
1082 cleanup_relayd_ht();
1083
1084 /*
1085 * This HT contains streams that are freed by either the metadata thread or
1086 * the data thread so we do *nothing* on the hash table and simply destroy
1087 * it.
1088 */
1089 lttng_ht_destroy(consumer_data.stream_list_ht);
3bd1e081
MD
1090}
1091
1092/*
1093 * Called from signal handler.
1094 */
1095void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx)
1096{
1097 int ret;
1098 consumer_quit = 1;
6f94560a
MD
1099 do {
1100 ret = write(ctx->consumer_should_quit[1], "4", 1);
1101 } while (ret < 0 && errno == EINTR);
3bd1e081 1102 if (ret < 0) {
7a57cf92 1103 PERROR("write consumer quit");
3bd1e081 1104 }
ab1027f4
DG
1105
1106 DBG("Consumer flag that it should quit");
3bd1e081
MD
1107}
1108
00e2e675
DG
1109void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream,
1110 off_t orig_offset)
3bd1e081
MD
1111{
1112 int outfd = stream->out_fd;
1113
1114 /*
1115 * This does a blocking write-and-wait on any page that belongs to the
1116 * subbuffer prior to the one we just wrote.
1117 * Don't care about error values, as these are just hints and ways to
1118 * limit the amount of page cache used.
1119 */
1120 if (orig_offset < stream->chan->max_sb_size) {
1121 return;
1122 }
b9182dd9 1123 lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size,
3bd1e081
MD
1124 stream->chan->max_sb_size,
1125 SYNC_FILE_RANGE_WAIT_BEFORE
1126 | SYNC_FILE_RANGE_WRITE
1127 | SYNC_FILE_RANGE_WAIT_AFTER);
1128 /*
1129 * Give hints to the kernel about how we access the file:
1130 * POSIX_FADV_DONTNEED : we won't re-access data in a near future after
1131 * we write it.
1132 *
1133 * We need to call fadvise again after the file grows because the
1134 * kernel does not seem to apply fadvise to non-existing parts of the
1135 * file.
1136 *
1137 * Call fadvise _after_ having waited for the page writeback to
1138 * complete because the dirty page writeback semantic is not well
1139 * defined. So it can be expected to lead to lower throughput in
1140 * streaming.
1141 */
1142 posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size,
1143 stream->chan->max_sb_size, POSIX_FADV_DONTNEED);
1144}
1145
1146/*
1147 * Initialise the necessary environnement :
1148 * - create a new context
1149 * - create the poll_pipe
1150 * - create the should_quit pipe (for signal handler)
1151 * - create the thread pipe (for splice)
1152 *
1153 * Takes a function pointer as argument, this function is called when data is
1154 * available on a buffer. This function is responsible to do the
1155 * kernctl_get_next_subbuf, read the data with mmap or splice depending on the
1156 * buffer configuration and then kernctl_put_next_subbuf at the end.
1157 *
1158 * Returns a pointer to the new context or NULL on error.
1159 */
1160struct lttng_consumer_local_data *lttng_consumer_create(
1161 enum lttng_consumer_type type,
4078b776 1162 ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream,
d41f73b7 1163 struct lttng_consumer_local_data *ctx),
3bd1e081
MD
1164 int (*recv_channel)(struct lttng_consumer_channel *channel),
1165 int (*recv_stream)(struct lttng_consumer_stream *stream),
1166 int (*update_stream)(int stream_key, uint32_t state))
1167{
1168 int ret, i;
1169 struct lttng_consumer_local_data *ctx;
1170
1171 assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN ||
1172 consumer_data.type == type);
1173 consumer_data.type = type;
1174
effcf122 1175 ctx = zmalloc(sizeof(struct lttng_consumer_local_data));
3bd1e081 1176 if (ctx == NULL) {
7a57cf92 1177 PERROR("allocating context");
3bd1e081
MD
1178 goto error;
1179 }
1180
1181 ctx->consumer_error_socket = -1;
1182 /* assign the callbacks */
1183 ctx->on_buffer_ready = buffer_ready;
1184 ctx->on_recv_channel = recv_channel;
1185 ctx->on_recv_stream = recv_stream;
1186 ctx->on_update_stream = update_stream;
1187
50f8ae69 1188 ret = pipe(ctx->consumer_data_pipe);
3bd1e081 1189 if (ret < 0) {
7a57cf92 1190 PERROR("Error creating poll pipe");
3bd1e081
MD
1191 goto error_poll_pipe;
1192 }
1193
04fdd819 1194 /* set read end of the pipe to non-blocking */
50f8ae69 1195 ret = fcntl(ctx->consumer_data_pipe[0], F_SETFL, O_NONBLOCK);
04fdd819 1196 if (ret < 0) {
7a57cf92 1197 PERROR("fcntl O_NONBLOCK");
04fdd819
MD
1198 goto error_poll_fcntl;
1199 }
1200
1201 /* set write end of the pipe to non-blocking */
50f8ae69 1202 ret = fcntl(ctx->consumer_data_pipe[1], F_SETFL, O_NONBLOCK);
04fdd819 1203 if (ret < 0) {
7a57cf92 1204 PERROR("fcntl O_NONBLOCK");
04fdd819
MD
1205 goto error_poll_fcntl;
1206 }
1207
3bd1e081
MD
1208 ret = pipe(ctx->consumer_should_quit);
1209 if (ret < 0) {
7a57cf92 1210 PERROR("Error creating recv pipe");
3bd1e081
MD
1211 goto error_quit_pipe;
1212 }
1213
1214 ret = pipe(ctx->consumer_thread_pipe);
1215 if (ret < 0) {
7a57cf92 1216 PERROR("Error creating thread pipe");
3bd1e081
MD
1217 goto error_thread_pipe;
1218 }
1219
fb3a43a9
DG
1220 ret = utils_create_pipe(ctx->consumer_metadata_pipe);
1221 if (ret < 0) {
1222 goto error_metadata_pipe;
1223 }
3bd1e081 1224
fb3a43a9
DG
1225 ret = utils_create_pipe(ctx->consumer_splice_metadata_pipe);
1226 if (ret < 0) {
1227 goto error_splice_pipe;
1228 }
1229
1230 return ctx;
3bd1e081 1231
fb3a43a9
DG
1232error_splice_pipe:
1233 utils_close_pipe(ctx->consumer_metadata_pipe);
1234error_metadata_pipe:
1235 utils_close_pipe(ctx->consumer_thread_pipe);
3bd1e081
MD
1236error_thread_pipe:
1237 for (i = 0; i < 2; i++) {
1238 int err;
1239
1240 err = close(ctx->consumer_should_quit[i]);
4c462e79
MD
1241 if (err) {
1242 PERROR("close");
1243 }
3bd1e081 1244 }
04fdd819 1245error_poll_fcntl:
3bd1e081
MD
1246error_quit_pipe:
1247 for (i = 0; i < 2; i++) {
1248 int err;
1249
50f8ae69 1250 err = close(ctx->consumer_data_pipe[i]);
4c462e79
MD
1251 if (err) {
1252 PERROR("close");
1253 }
3bd1e081
MD
1254 }
1255error_poll_pipe:
1256 free(ctx);
1257error:
1258 return NULL;
1259}
1260
1261/*
1262 * Close all fds associated with the instance and free the context.
1263 */
1264void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx)
1265{
4c462e79
MD
1266 int ret;
1267
ab1027f4
DG
1268 DBG("Consumer destroying it. Closing everything.");
1269
4c462e79
MD
1270 ret = close(ctx->consumer_error_socket);
1271 if (ret) {
1272 PERROR("close");
1273 }
1274 ret = close(ctx->consumer_thread_pipe[0]);
1275 if (ret) {
1276 PERROR("close");
1277 }
1278 ret = close(ctx->consumer_thread_pipe[1]);
1279 if (ret) {
1280 PERROR("close");
1281 }
50f8ae69 1282 ret = close(ctx->consumer_data_pipe[0]);
4c462e79
MD
1283 if (ret) {
1284 PERROR("close");
1285 }
50f8ae69 1286 ret = close(ctx->consumer_data_pipe[1]);
4c462e79
MD
1287 if (ret) {
1288 PERROR("close");
1289 }
1290 ret = close(ctx->consumer_should_quit[0]);
1291 if (ret) {
1292 PERROR("close");
1293 }
1294 ret = close(ctx->consumer_should_quit[1]);
1295 if (ret) {
1296 PERROR("close");
1297 }
fb3a43a9
DG
1298 utils_close_pipe(ctx->consumer_splice_metadata_pipe);
1299
3bd1e081
MD
1300 unlink(ctx->consumer_command_sock_path);
1301 free(ctx);
1302}
1303
6197aea7
DG
1304/*
1305 * Write the metadata stream id on the specified file descriptor.
1306 */
1307static int write_relayd_metadata_id(int fd,
1308 struct lttng_consumer_stream *stream,
1d4dfdef
DG
1309 struct consumer_relayd_sock_pair *relayd,
1310 unsigned long padding)
6197aea7
DG
1311{
1312 int ret;
1d4dfdef 1313 struct lttcomm_relayd_metadata_payload hdr;
6197aea7 1314
1d4dfdef
DG
1315 hdr.stream_id = htobe64(stream->relayd_stream_id);
1316 hdr.padding_size = htobe32(padding);
6197aea7 1317 do {
1d4dfdef 1318 ret = write(fd, (void *) &hdr, sizeof(hdr));
6197aea7
DG
1319 } while (ret < 0 && errno == EINTR);
1320 if (ret < 0) {
1321 PERROR("write metadata stream id");
1322 goto end;
1323 }
1d4dfdef
DG
1324 DBG("Metadata stream id %" PRIu64 " with padding %lu written before data",
1325 stream->relayd_stream_id, padding);
6197aea7
DG
1326
1327end:
1328 return ret;
1329}
1330
3bd1e081 1331/*
09e26845
DG
1332 * Mmap the ring buffer, read it and write the data to the tracefile. This is a
1333 * core function for writing trace buffers to either the local filesystem or
1334 * the network.
1335 *
79d4ffb7
DG
1336 * It must be called with the stream lock held.
1337 *
09e26845 1338 * Careful review MUST be put if any changes occur!
3bd1e081
MD
1339 *
1340 * Returns the number of bytes written
1341 */
4078b776 1342ssize_t lttng_consumer_on_read_subbuffer_mmap(
3bd1e081 1343 struct lttng_consumer_local_data *ctx,
1d4dfdef
DG
1344 struct lttng_consumer_stream *stream, unsigned long len,
1345 unsigned long padding)
3bd1e081 1346{
f02e1e8a
DG
1347 unsigned long mmap_offset;
1348 ssize_t ret = 0, written = 0;
1349 off_t orig_offset = stream->out_fd_offset;
1350 /* Default is on the disk */
1351 int outfd = stream->out_fd;
f02e1e8a 1352 struct consumer_relayd_sock_pair *relayd = NULL;
8994307f 1353 unsigned int relayd_hang_up = 0;
f02e1e8a
DG
1354
1355 /* RCU lock for the relayd pointer */
1356 rcu_read_lock();
1357
1358 /* Flag that the current stream if set for network streaming. */
1359 if (stream->net_seq_idx != -1) {
1360 relayd = consumer_find_relayd(stream->net_seq_idx);
1361 if (relayd == NULL) {
1362 goto end;
1363 }
1364 }
1365
1366 /* get the offset inside the fd to mmap */
3bd1e081
MD
1367 switch (consumer_data.type) {
1368 case LTTNG_CONSUMER_KERNEL:
f02e1e8a
DG
1369 ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset);
1370 break;
7753dea8
MD
1371 case LTTNG_CONSUMER32_UST:
1372 case LTTNG_CONSUMER64_UST:
f02e1e8a
DG
1373 ret = lttng_ustctl_get_mmap_read_offset(stream->chan->handle,
1374 stream->buf, &mmap_offset);
1375 break;
3bd1e081
MD
1376 default:
1377 ERR("Unknown consumer_data type");
1378 assert(0);
1379 }
f02e1e8a
DG
1380 if (ret != 0) {
1381 errno = -ret;
1382 PERROR("tracer ctl get_mmap_read_offset");
1383 written = ret;
1384 goto end;
1385 }
b9182dd9 1386
f02e1e8a
DG
1387 /* Handle stream on the relayd if the output is on the network */
1388 if (relayd) {
1389 unsigned long netlen = len;
1390
1391 /*
1392 * Lock the control socket for the complete duration of the function
1393 * since from this point on we will use the socket.
1394 */
1395 if (stream->metadata_flag) {
1396 /* Metadata requires the control socket. */
1397 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
1d4dfdef 1398 netlen += sizeof(struct lttcomm_relayd_metadata_payload);
f02e1e8a
DG
1399 }
1400
1d4dfdef 1401 ret = write_relayd_stream_header(stream, netlen, padding, relayd);
f02e1e8a
DG
1402 if (ret >= 0) {
1403 /* Use the returned socket. */
1404 outfd = ret;
1405
1406 /* Write metadata stream id before payload */
1407 if (stream->metadata_flag) {
1d4dfdef 1408 ret = write_relayd_metadata_id(outfd, stream, relayd, padding);
f02e1e8a 1409 if (ret < 0) {
f02e1e8a 1410 written = ret;
8994307f
DG
1411 /* Socket operation failed. We consider the relayd dead */
1412 if (ret == -EPIPE || ret == -EINVAL) {
1413 relayd_hang_up = 1;
1414 goto write_error;
1415 }
f02e1e8a
DG
1416 goto end;
1417 }
f02e1e8a 1418 }
8994307f
DG
1419 } else {
1420 /* Socket operation failed. We consider the relayd dead */
1421 if (ret == -EPIPE || ret == -EINVAL) {
1422 relayd_hang_up = 1;
1423 goto write_error;
1424 }
1425 /* Else, use the default set before which is the filesystem. */
f02e1e8a 1426 }
1d4dfdef
DG
1427 } else {
1428 /* No streaming, we have to set the len with the full padding */
1429 len += padding;
f02e1e8a
DG
1430 }
1431
1432 while (len > 0) {
1433 do {
1434 ret = write(outfd, stream->mmap_base + mmap_offset, len);
1435 } while (ret < 0 && errno == EINTR);
1d4dfdef 1436 DBG("Consumer mmap write() ret %zd (len %lu)", ret, len);
f02e1e8a
DG
1437 if (ret < 0) {
1438 PERROR("Error in file write");
1439 if (written == 0) {
1440 written = ret;
1441 }
8994307f
DG
1442 /* Socket operation failed. We consider the relayd dead */
1443 if (errno == EPIPE || errno == EINVAL) {
1444 relayd_hang_up = 1;
1445 goto write_error;
1446 }
f02e1e8a
DG
1447 goto end;
1448 } else if (ret > len) {
77c7c900 1449 PERROR("Error in file write (ret %zd > len %lu)", ret, len);
f02e1e8a
DG
1450 written += ret;
1451 goto end;
1452 } else {
1453 len -= ret;
1454 mmap_offset += ret;
1455 }
f02e1e8a
DG
1456
1457 /* This call is useless on a socket so better save a syscall. */
1458 if (!relayd) {
1459 /* This won't block, but will start writeout asynchronously */
1460 lttng_sync_file_range(outfd, stream->out_fd_offset, ret,
1461 SYNC_FILE_RANGE_WRITE);
1462 stream->out_fd_offset += ret;
1463 }
1464 written += ret;
1465 }
1466 lttng_consumer_sync_trace_file(stream, orig_offset);
1467
8994307f
DG
1468write_error:
1469 /*
1470 * This is a special case that the relayd has closed its socket. Let's
1471 * cleanup the relayd object and all associated streams.
1472 */
1473 if (relayd && relayd_hang_up) {
1474 cleanup_relayd(relayd, ctx);
1475 }
1476
f02e1e8a
DG
1477end:
1478 /* Unlock only if ctrl socket used */
1479 if (relayd && stream->metadata_flag) {
1480 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
1481 }
1482
1483 rcu_read_unlock();
1484 return written;
3bd1e081
MD
1485}
1486
1487/*
1488 * Splice the data from the ring buffer to the tracefile.
1489 *
79d4ffb7
DG
1490 * It must be called with the stream lock held.
1491 *
3bd1e081
MD
1492 * Returns the number of bytes spliced.
1493 */
4078b776 1494ssize_t lttng_consumer_on_read_subbuffer_splice(
3bd1e081 1495 struct lttng_consumer_local_data *ctx,
1d4dfdef
DG
1496 struct lttng_consumer_stream *stream, unsigned long len,
1497 unsigned long padding)
3bd1e081 1498{
f02e1e8a
DG
1499 ssize_t ret = 0, written = 0, ret_splice = 0;
1500 loff_t offset = 0;
1501 off_t orig_offset = stream->out_fd_offset;
1502 int fd = stream->wait_fd;
1503 /* Default is on the disk */
1504 int outfd = stream->out_fd;
f02e1e8a 1505 struct consumer_relayd_sock_pair *relayd = NULL;
fb3a43a9 1506 int *splice_pipe;
8994307f 1507 unsigned int relayd_hang_up = 0;
f02e1e8a 1508
3bd1e081
MD
1509 switch (consumer_data.type) {
1510 case LTTNG_CONSUMER_KERNEL:
f02e1e8a 1511 break;
7753dea8
MD
1512 case LTTNG_CONSUMER32_UST:
1513 case LTTNG_CONSUMER64_UST:
f02e1e8a 1514 /* Not supported for user space tracing */
3bd1e081
MD
1515 return -ENOSYS;
1516 default:
1517 ERR("Unknown consumer_data type");
1518 assert(0);
3bd1e081
MD
1519 }
1520
f02e1e8a
DG
1521 /* RCU lock for the relayd pointer */
1522 rcu_read_lock();
1523
1524 /* Flag that the current stream if set for network streaming. */
1525 if (stream->net_seq_idx != -1) {
1526 relayd = consumer_find_relayd(stream->net_seq_idx);
1527 if (relayd == NULL) {
1528 goto end;
1529 }
1530 }
1531
fb3a43a9
DG
1532 /*
1533 * Choose right pipe for splice. Metadata and trace data are handled by
1534 * different threads hence the use of two pipes in order not to race or
1535 * corrupt the written data.
1536 */
1537 if (stream->metadata_flag) {
1538 splice_pipe = ctx->consumer_splice_metadata_pipe;
1539 } else {
1540 splice_pipe = ctx->consumer_thread_pipe;
1541 }
1542
f02e1e8a 1543 /* Write metadata stream id before payload */
1d4dfdef
DG
1544 if (relayd) {
1545 int total_len = len;
f02e1e8a 1546
1d4dfdef
DG
1547 if (stream->metadata_flag) {
1548 /*
1549 * Lock the control socket for the complete duration of the function
1550 * since from this point on we will use the socket.
1551 */
1552 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
1553
1554 ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd,
1555 padding);
1556 if (ret < 0) {
1557 written = ret;
8994307f
DG
1558 /* Socket operation failed. We consider the relayd dead */
1559 if (ret == -EBADF) {
1560 WARN("Remote relayd disconnected. Stopping");
1561 relayd_hang_up = 1;
1562 goto write_error;
1563 }
1d4dfdef
DG
1564 goto end;
1565 }
1566
1567 total_len += sizeof(struct lttcomm_relayd_metadata_payload);
1568 }
1569
1570 ret = write_relayd_stream_header(stream, total_len, padding, relayd);
1571 if (ret >= 0) {
1572 /* Use the returned socket. */
1573 outfd = ret;
1574 } else {
8994307f
DG
1575 /* Socket operation failed. We consider the relayd dead */
1576 if (ret == -EBADF) {
1577 WARN("Remote relayd disconnected. Stopping");
1578 relayd_hang_up = 1;
1579 goto write_error;
1580 }
f02e1e8a
DG
1581 goto end;
1582 }
1d4dfdef
DG
1583 } else {
1584 /* No streaming, we have to set the len with the full padding */
1585 len += padding;
f02e1e8a
DG
1586 }
1587
1588 while (len > 0) {
1d4dfdef
DG
1589 DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)",
1590 (unsigned long)offset, len, fd, splice_pipe[1]);
fb3a43a9 1591 ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len,
f02e1e8a
DG
1592 SPLICE_F_MOVE | SPLICE_F_MORE);
1593 DBG("splice chan to pipe, ret %zd", ret_splice);
1594 if (ret_splice < 0) {
1595 PERROR("Error in relay splice");
1596 if (written == 0) {
1597 written = ret_splice;
1598 }
1599 ret = errno;
1600 goto splice_error;
1601 }
1602
1603 /* Handle stream on the relayd if the output is on the network */
1604 if (relayd) {
1605 if (stream->metadata_flag) {
1d4dfdef
DG
1606 size_t metadata_payload_size =
1607 sizeof(struct lttcomm_relayd_metadata_payload);
1608
f02e1e8a 1609 /* Update counter to fit the spliced data */
1d4dfdef
DG
1610 ret_splice += metadata_payload_size;
1611 len += metadata_payload_size;
f02e1e8a
DG
1612 /*
1613 * We do this so the return value can match the len passed as
1614 * argument to this function.
1615 */
1d4dfdef 1616 written -= metadata_payload_size;
f02e1e8a
DG
1617 }
1618 }
1619
1620 /* Splice data out */
fb3a43a9 1621 ret_splice = splice(splice_pipe[0], NULL, outfd, NULL,
f02e1e8a 1622 ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE);
1d4dfdef 1623 DBG("Consumer splice pipe to file, ret %zd", ret_splice);
f02e1e8a
DG
1624 if (ret_splice < 0) {
1625 PERROR("Error in file splice");
1626 if (written == 0) {
1627 written = ret_splice;
1628 }
8994307f 1629 /* Socket operation failed. We consider the relayd dead */
00c8752b 1630 if (errno == EBADF || errno == EPIPE) {
8994307f
DG
1631 WARN("Remote relayd disconnected. Stopping");
1632 relayd_hang_up = 1;
1633 goto write_error;
1634 }
f02e1e8a
DG
1635 ret = errno;
1636 goto splice_error;
1637 } else if (ret_splice > len) {
1638 errno = EINVAL;
1639 PERROR("Wrote more data than requested %zd (len: %lu)",
1640 ret_splice, len);
1641 written += ret_splice;
1642 ret = errno;
1643 goto splice_error;
1644 }
1645 len -= ret_splice;
1646
1647 /* This call is useless on a socket so better save a syscall. */
1648 if (!relayd) {
1649 /* This won't block, but will start writeout asynchronously */
1650 lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice,
1651 SYNC_FILE_RANGE_WRITE);
1652 stream->out_fd_offset += ret_splice;
1653 }
1654 written += ret_splice;
1655 }
1656 lttng_consumer_sync_trace_file(stream, orig_offset);
1657
1658 ret = ret_splice;
1659
1660 goto end;
1661
8994307f
DG
1662write_error:
1663 /*
1664 * This is a special case that the relayd has closed its socket. Let's
1665 * cleanup the relayd object and all associated streams.
1666 */
1667 if (relayd && relayd_hang_up) {
1668 cleanup_relayd(relayd, ctx);
1669 /* Skip splice error so the consumer does not fail */
1670 goto end;
1671 }
1672
f02e1e8a
DG
1673splice_error:
1674 /* send the appropriate error description to sessiond */
1675 switch (ret) {
f02e1e8a 1676 case EINVAL:
f73fabfd 1677 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL);
f02e1e8a
DG
1678 break;
1679 case ENOMEM:
f73fabfd 1680 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM);
f02e1e8a
DG
1681 break;
1682 case ESPIPE:
f73fabfd 1683 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE);
f02e1e8a
DG
1684 break;
1685 }
1686
1687end:
1688 if (relayd && stream->metadata_flag) {
1689 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
1690 }
1691
1692 rcu_read_unlock();
1693 return written;
3bd1e081
MD
1694}
1695
1696/*
1697 * Take a snapshot for a specific fd
1698 *
1699 * Returns 0 on success, < 0 on error
1700 */
1701int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx,
1702 struct lttng_consumer_stream *stream)
1703{
1704 switch (consumer_data.type) {
1705 case LTTNG_CONSUMER_KERNEL:
1706 return lttng_kconsumer_take_snapshot(ctx, stream);
7753dea8
MD
1707 case LTTNG_CONSUMER32_UST:
1708 case LTTNG_CONSUMER64_UST:
3bd1e081
MD
1709 return lttng_ustconsumer_take_snapshot(ctx, stream);
1710 default:
1711 ERR("Unknown consumer_data type");
1712 assert(0);
1713 return -ENOSYS;
1714 }
1715
1716}
1717
1718/*
1719 * Get the produced position
1720 *
1721 * Returns 0 on success, < 0 on error
1722 */
1723int lttng_consumer_get_produced_snapshot(
1724 struct lttng_consumer_local_data *ctx,
1725 struct lttng_consumer_stream *stream,
1726 unsigned long *pos)
1727{
1728 switch (consumer_data.type) {
1729 case LTTNG_CONSUMER_KERNEL:
1730 return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos);
7753dea8
MD
1731 case LTTNG_CONSUMER32_UST:
1732 case LTTNG_CONSUMER64_UST:
3bd1e081
MD
1733 return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos);
1734 default:
1735 ERR("Unknown consumer_data type");
1736 assert(0);
1737 return -ENOSYS;
1738 }
1739}
1740
1741int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx,
1742 int sock, struct pollfd *consumer_sockpoll)
1743{
1744 switch (consumer_data.type) {
1745 case LTTNG_CONSUMER_KERNEL:
1746 return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll);
7753dea8
MD
1747 case LTTNG_CONSUMER32_UST:
1748 case LTTNG_CONSUMER64_UST:
3bd1e081
MD
1749 return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll);
1750 default:
1751 ERR("Unknown consumer_data type");
1752 assert(0);
1753 return -ENOSYS;
1754 }
1755}
1756
43c34bc3
DG
1757/*
1758 * Iterate over all streams of the hashtable and free them properly.
1759 *
1760 * WARNING: *MUST* be used with data stream only.
1761 */
1762static void destroy_data_stream_ht(struct lttng_ht *ht)
1763{
43c34bc3
DG
1764 struct lttng_ht_iter iter;
1765 struct lttng_consumer_stream *stream;
1766
1767 if (ht == NULL) {
1768 return;
1769 }
1770
1771 rcu_read_lock();
1772 cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) {
5c540210
DG
1773 /*
1774 * Ignore return value since we are currently cleaning up so any error
1775 * can't be handled.
1776 */
1777 (void) consumer_del_stream(stream, ht);
43c34bc3
DG
1778 }
1779 rcu_read_unlock();
1780
1781 lttng_ht_destroy(ht);
1782}
1783
fb3a43a9 1784/*
f724d81e 1785 * Iterate over all streams of the hashtable and free them properly.
e316aad5
DG
1786 *
1787 * XXX: Should not be only for metadata stream or else use an other name.
fb3a43a9
DG
1788 */
1789static void destroy_stream_ht(struct lttng_ht *ht)
1790{
fb3a43a9
DG
1791 struct lttng_ht_iter iter;
1792 struct lttng_consumer_stream *stream;
1793
1794 if (ht == NULL) {
1795 return;
1796 }
1797
d09e1200 1798 rcu_read_lock();
58b1f425 1799 cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) {
5c540210
DG
1800 /*
1801 * Ignore return value since we are currently cleaning up so any error
1802 * can't be handled.
1803 */
1804 (void) consumer_del_metadata_stream(stream, ht);
fb3a43a9 1805 }
d09e1200 1806 rcu_read_unlock();
fb3a43a9
DG
1807
1808 lttng_ht_destroy(ht);
1809}
1810
1811/*
1812 * Clean up a metadata stream and free its memory.
1813 */
e316aad5
DG
1814void consumer_del_metadata_stream(struct lttng_consumer_stream *stream,
1815 struct lttng_ht *ht)
fb3a43a9
DG
1816{
1817 int ret;
e316aad5
DG
1818 struct lttng_ht_iter iter;
1819 struct lttng_consumer_channel *free_chan = NULL;
fb3a43a9
DG
1820 struct consumer_relayd_sock_pair *relayd;
1821
1822 assert(stream);
1823 /*
1824 * This call should NEVER receive regular stream. It must always be
1825 * metadata stream and this is crucial for data structure synchronization.
1826 */
1827 assert(stream->metadata_flag);
1828
e316aad5
DG
1829 DBG3("Consumer delete metadata stream %d", stream->wait_fd);
1830
1831 if (ht == NULL) {
1832 /* Means the stream was allocated but not successfully added */
1833 goto free_stream;
1834 }
1835
74251bb8 1836 pthread_mutex_lock(&consumer_data.lock);
8994307f
DG
1837 pthread_mutex_lock(&stream->lock);
1838
fb3a43a9
DG
1839 switch (consumer_data.type) {
1840 case LTTNG_CONSUMER_KERNEL:
1841 if (stream->mmap_base != NULL) {
1842 ret = munmap(stream->mmap_base, stream->mmap_len);
1843 if (ret != 0) {
1844 PERROR("munmap metadata stream");
1845 }
1846 }
1847 break;
1848 case LTTNG_CONSUMER32_UST:
1849 case LTTNG_CONSUMER64_UST:
1850 lttng_ustconsumer_del_stream(stream);
1851 break;
1852 default:
1853 ERR("Unknown consumer_data type");
1854 assert(0);
e316aad5 1855 goto end;
fb3a43a9 1856 }
fb3a43a9 1857
c869f647 1858 rcu_read_lock();
58b1f425 1859 iter.iter.node = &stream->node.node;
c869f647
DG
1860 ret = lttng_ht_del(ht, &iter);
1861 assert(!ret);
ca22feea
DG
1862
1863 /* Remove node session id from the consumer_data stream ht */
1864 iter.iter.node = &stream->node_session_id.node;
1865 ret = lttng_ht_del(consumer_data.stream_list_ht, &iter);
1866 assert(!ret);
c869f647
DG
1867 rcu_read_unlock();
1868
fb3a43a9
DG
1869 if (stream->out_fd >= 0) {
1870 ret = close(stream->out_fd);
1871 if (ret) {
1872 PERROR("close");
1873 }
1874 }
1875
1876 if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) {
1877 ret = close(stream->wait_fd);
1878 if (ret) {
1879 PERROR("close");
1880 }
1881 }
1882
1883 if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) {
1884 ret = close(stream->shm_fd);
1885 if (ret) {
1886 PERROR("close");
1887 }
1888 }
1889
1890 /* Check and cleanup relayd */
1891 rcu_read_lock();
1892 relayd = consumer_find_relayd(stream->net_seq_idx);
1893 if (relayd != NULL) {
1894 uatomic_dec(&relayd->refcount);
1895 assert(uatomic_read(&relayd->refcount) >= 0);
1896
1897 /* Closing streams requires to lock the control socket. */
1898 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
1899 ret = relayd_send_close_stream(&relayd->control_sock,
1900 stream->relayd_stream_id, stream->next_net_seq_num - 1);
1901 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
1902 if (ret < 0) {
1903 DBG("Unable to close stream on the relayd. Continuing");
1904 /*
1905 * Continue here. There is nothing we can do for the relayd.
1906 * Chances are that the relayd has closed the socket so we just
1907 * continue cleaning up.
1908 */
1909 }
1910
1911 /* Both conditions are met, we destroy the relayd. */
1912 if (uatomic_read(&relayd->refcount) == 0 &&
1913 uatomic_read(&relayd->destroy_flag)) {
d09e1200 1914 destroy_relayd(relayd);
fb3a43a9
DG
1915 }
1916 }
1917 rcu_read_unlock();
1918
1919 /* Atomically decrement channel refcount since other threads can use it. */
1920 uatomic_dec(&stream->chan->refcount);
c30aaa51
MD
1921 if (!uatomic_read(&stream->chan->refcount)
1922 && !uatomic_read(&stream->chan->nb_init_streams)) {
1923 /* Go for channel deletion! */
e316aad5 1924 free_chan = stream->chan;
fb3a43a9
DG
1925 }
1926
e316aad5 1927end:
8994307f 1928 pthread_mutex_unlock(&stream->lock);
74251bb8 1929 pthread_mutex_unlock(&consumer_data.lock);
e316aad5
DG
1930
1931 if (free_chan) {
1932 consumer_del_channel(free_chan);
1933 }
1934
1935free_stream:
58b1f425 1936 call_rcu(&stream->node.head, consumer_free_stream);
fb3a43a9
DG
1937}
1938
1939/*
1940 * Action done with the metadata stream when adding it to the consumer internal
1941 * data structures to handle it.
1942 */
e316aad5
DG
1943static int consumer_add_metadata_stream(struct lttng_consumer_stream *stream,
1944 struct lttng_ht *ht)
fb3a43a9 1945{
e316aad5 1946 int ret = 0;
fb3a43a9 1947 struct consumer_relayd_sock_pair *relayd;
76082088
DG
1948 struct lttng_ht_iter iter;
1949 struct lttng_ht_node_ulong *node;
fb3a43a9 1950
e316aad5
DG
1951 assert(stream);
1952 assert(ht);
1953
1954 DBG3("Adding metadata stream %d to hash table", stream->wait_fd);
1955
1956 pthread_mutex_lock(&consumer_data.lock);
2e818a6a 1957 pthread_mutex_lock(&stream->lock);
e316aad5 1958
e316aad5
DG
1959 /*
1960 * From here, refcounts are updated so be _careful_ when returning an error
1961 * after this point.
1962 */
1963
fb3a43a9 1964 rcu_read_lock();
76082088
DG
1965
1966 /*
1967 * Lookup the stream just to make sure it does not exist in our internal
1968 * state. This should NEVER happen.
1969 */
1970 lttng_ht_lookup(ht, (void *)((unsigned long) stream->wait_fd), &iter);
1971 node = lttng_ht_iter_get_node_ulong(&iter);
1972 assert(!node);
1973
e316aad5 1974 /* Find relayd and, if one is found, increment refcount. */
fb3a43a9
DG
1975 relayd = consumer_find_relayd(stream->net_seq_idx);
1976 if (relayd != NULL) {
1977 uatomic_inc(&relayd->refcount);
1978 }
e316aad5
DG
1979
1980 /* Update channel refcount once added without error(s). */
1981 uatomic_inc(&stream->chan->refcount);
1982
1983 /*
1984 * When nb_init_streams reaches 0, we don't need to trigger any action in
1985 * terms of destroying the associated channel, because the action that
1986 * causes the count to become 0 also causes a stream to be added. The
1987 * channel deletion will thus be triggered by the following removal of this
1988 * stream.
1989 */
1990 if (uatomic_read(&stream->chan->nb_init_streams) > 0) {
1991 uatomic_dec(&stream->chan->nb_init_streams);
1992 }
1993
58b1f425 1994 lttng_ht_add_unique_ulong(ht, &stream->node);
ca22feea
DG
1995
1996 /*
1997 * Add stream to the stream_list_ht of the consumer data. No need to steal
1998 * the key since the HT does not use it and we allow to add redundant keys
1999 * into this table.
2000 */
2001 lttng_ht_add_ulong(consumer_data.stream_list_ht, &stream->node_session_id);
2002
fb3a43a9 2003 rcu_read_unlock();
e316aad5 2004
2e818a6a 2005 pthread_mutex_unlock(&stream->lock);
e316aad5
DG
2006 pthread_mutex_unlock(&consumer_data.lock);
2007 return ret;
fb3a43a9
DG
2008}
2009
8994307f
DG
2010/*
2011 * Delete data stream that are flagged for deletion (endpoint_status).
2012 */
2013static void validate_endpoint_status_data_stream(void)
2014{
2015 struct lttng_ht_iter iter;
2016 struct lttng_consumer_stream *stream;
2017
2018 DBG("Consumer delete flagged data stream");
2019
2020 rcu_read_lock();
2021 cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) {
2022 /* Validate delete flag of the stream */
79d4ffb7 2023 if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) {
8994307f
DG
2024 continue;
2025 }
2026 /* Delete it right now */
2027 consumer_del_stream(stream, data_ht);
2028 }
2029 rcu_read_unlock();
2030}
2031
2032/*
2033 * Delete metadata stream that are flagged for deletion (endpoint_status).
2034 */
2035static void validate_endpoint_status_metadata_stream(
2036 struct lttng_poll_event *pollset)
2037{
2038 struct lttng_ht_iter iter;
2039 struct lttng_consumer_stream *stream;
2040
2041 DBG("Consumer delete flagged metadata stream");
2042
2043 assert(pollset);
2044
2045 rcu_read_lock();
2046 cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) {
2047 /* Validate delete flag of the stream */
79d4ffb7 2048 if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) {
8994307f
DG
2049 continue;
2050 }
2051 /*
2052 * Remove from pollset so the metadata thread can continue without
2053 * blocking on a deleted stream.
2054 */
2055 lttng_poll_del(pollset, stream->wait_fd);
2056
2057 /* Delete it right now */
2058 consumer_del_metadata_stream(stream, metadata_ht);
2059 }
2060 rcu_read_unlock();
2061}
2062
fb3a43a9
DG
2063/*
2064 * Thread polls on metadata file descriptor and write them on disk or on the
2065 * network.
2066 */
7d980def 2067void *consumer_thread_metadata_poll(void *data)
fb3a43a9
DG
2068{
2069 int ret, i, pollfd;
2070 uint32_t revents, nb_fd;
e316aad5 2071 struct lttng_consumer_stream *stream = NULL;
fb3a43a9
DG
2072 struct lttng_ht_iter iter;
2073 struct lttng_ht_node_ulong *node;
fb3a43a9
DG
2074 struct lttng_poll_event events;
2075 struct lttng_consumer_local_data *ctx = data;
2076 ssize_t len;
2077
2078 rcu_register_thread();
2079
04bb2b64
DG
2080 metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
2081 if (!metadata_ht) {
2082 /* ENOMEM at this point. Better to bail out. */
2083 goto error;
2084 }
2085
fb3a43a9
DG
2086 DBG("Thread metadata poll started");
2087
fb3a43a9
DG
2088 /* Size is set to 1 for the consumer_metadata pipe */
2089 ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
2090 if (ret < 0) {
2091 ERR("Poll set creation failed");
2092 goto end;
2093 }
2094
2095 ret = lttng_poll_add(&events, ctx->consumer_metadata_pipe[0], LPOLLIN);
2096 if (ret < 0) {
2097 goto end;
2098 }
2099
2100 /* Main loop */
2101 DBG("Metadata main loop started");
2102
2103 while (1) {
2104 lttng_poll_reset(&events);
2105
2106 nb_fd = LTTNG_POLL_GETNB(&events);
2107
2108 /* Only the metadata pipe is set */
2109 if (nb_fd == 0 && consumer_quit == 1) {
2110 goto end;
2111 }
2112
2113restart:
2114 DBG("Metadata poll wait with %d fd(s)", nb_fd);
2115 ret = lttng_poll_wait(&events, -1);
2116 DBG("Metadata event catched in thread");
2117 if (ret < 0) {
2118 if (errno == EINTR) {
e316aad5 2119 ERR("Poll EINTR catched");
fb3a43a9
DG
2120 goto restart;
2121 }
2122 goto error;
2123 }
2124
e316aad5 2125 /* From here, the event is a metadata wait fd */
fb3a43a9
DG
2126 for (i = 0; i < nb_fd; i++) {
2127 revents = LTTNG_POLL_GETEV(&events, i);
2128 pollfd = LTTNG_POLL_GETFD(&events, i);
2129
e316aad5
DG
2130 /* Just don't waste time if no returned events for the fd */
2131 if (!revents) {
2132 continue;
2133 }
2134
fb3a43a9 2135 if (pollfd == ctx->consumer_metadata_pipe[0]) {
4adabd61 2136 if (revents & (LPOLLERR | LPOLLHUP )) {
fb3a43a9
DG
2137 DBG("Metadata thread pipe hung up");
2138 /*
2139 * Remove the pipe from the poll set and continue the loop
2140 * since their might be data to consume.
2141 */
2142 lttng_poll_del(&events, ctx->consumer_metadata_pipe[0]);
f66c074c
DG
2143 ret = close(ctx->consumer_metadata_pipe[0]);
2144 if (ret < 0) {
2145 PERROR("close metadata pipe");
2146 }
fb3a43a9
DG
2147 continue;
2148 } else if (revents & LPOLLIN) {
fb3a43a9 2149 do {
633d0084
DG
2150 /* Get the stream pointer received */
2151 ret = read(pollfd, &stream, sizeof(stream));
fb3a43a9 2152 } while (ret < 0 && errno == EINTR);
633d0084
DG
2153 if (ret < 0 ||
2154 ret < sizeof(struct lttng_consumer_stream *)) {
fb3a43a9 2155 PERROR("read metadata stream");
fb3a43a9
DG
2156 /*
2157 * Let's continue here and hope we can still work
2158 * without stopping the consumer. XXX: Should we?
2159 */
2160 continue;
2161 }
2162
8994307f
DG
2163 /* A NULL stream means that the state has changed. */
2164 if (stream == NULL) {
2165 /* Check for deleted streams. */
2166 validate_endpoint_status_metadata_stream(&events);
2167 continue;
2168 }
2169
fb3a43a9
DG
2170 DBG("Adding metadata stream %d to poll set",
2171 stream->wait_fd);
2172
e316aad5
DG
2173 ret = consumer_add_metadata_stream(stream, metadata_ht);
2174 if (ret) {
2175 ERR("Unable to add metadata stream");
2176 /* Stream was not setup properly. Continuing. */
2177 consumer_del_metadata_stream(stream, NULL);
2178 continue;
2179 }
fb3a43a9
DG
2180
2181 /* Add metadata stream to the global poll events list */
2182 lttng_poll_add(&events, stream->wait_fd,
2183 LPOLLIN | LPOLLPRI);
fb3a43a9
DG
2184 }
2185
e316aad5 2186 /* Handle other stream */
fb3a43a9
DG
2187 continue;
2188 }
2189
d09e1200 2190 rcu_read_lock();
fb3a43a9
DG
2191 lttng_ht_lookup(metadata_ht, (void *)((unsigned long) pollfd),
2192 &iter);
2193 node = lttng_ht_iter_get_node_ulong(&iter);
e316aad5 2194 assert(node);
fb3a43a9
DG
2195
2196 stream = caa_container_of(node, struct lttng_consumer_stream,
58b1f425 2197 node);
fb3a43a9 2198
e316aad5 2199 /* Check for error event */
4adabd61 2200 if (revents & (LPOLLERR | LPOLLHUP)) {
e316aad5 2201 DBG("Metadata fd %d is hup|err.", pollfd);
fb3a43a9
DG
2202 if (!stream->hangup_flush_done
2203 && (consumer_data.type == LTTNG_CONSUMER32_UST
2204 || consumer_data.type == LTTNG_CONSUMER64_UST)) {
2205 DBG("Attempting to flush and consume the UST buffers");
2206 lttng_ustconsumer_on_stream_hangup(stream);
2207
2208 /* We just flushed the stream now read it. */
4bb94b75
DG
2209 do {
2210 len = ctx->on_buffer_ready(stream, ctx);
2211 /*
2212 * We don't check the return value here since if we get
2213 * a negative len, it means an error occured thus we
2214 * simply remove it from the poll set and free the
2215 * stream.
2216 */
2217 } while (len > 0);
fb3a43a9
DG
2218 }
2219
fb3a43a9 2220 lttng_poll_del(&events, stream->wait_fd);
e316aad5
DG
2221 /*
2222 * This call update the channel states, closes file descriptors
2223 * and securely free the stream.
2224 */
2225 consumer_del_metadata_stream(stream, metadata_ht);
2226 } else if (revents & (LPOLLIN | LPOLLPRI)) {
2227 /* Get the data out of the metadata file descriptor */
2228 DBG("Metadata available on fd %d", pollfd);
2229 assert(stream->wait_fd == pollfd);
2230
2231 len = ctx->on_buffer_ready(stream, ctx);
2232 /* It's ok to have an unavailable sub-buffer */
b64403e3 2233 if (len < 0 && len != -EAGAIN && len != -ENODATA) {
ab1027f4
DG
2234 /* Clean up stream from consumer and free it. */
2235 lttng_poll_del(&events, stream->wait_fd);
2236 consumer_del_metadata_stream(stream, metadata_ht);
e316aad5
DG
2237 } else if (len > 0) {
2238 stream->data_read = 1;
2239 }
fb3a43a9 2240 }
e316aad5
DG
2241
2242 /* Release RCU lock for the stream looked up */
d09e1200 2243 rcu_read_unlock();
fb3a43a9
DG
2244 }
2245 }
2246
2247error:
2248end:
2249 DBG("Metadata poll thread exiting");
2250 lttng_poll_clean(&events);
2251
04bb2b64 2252 destroy_stream_ht(metadata_ht);
fb3a43a9
DG
2253
2254 rcu_unregister_thread();
2255 return NULL;
2256}
2257
3bd1e081 2258/*
e4421fec 2259 * This thread polls the fds in the set to consume the data and write
3bd1e081
MD
2260 * it to tracefile if necessary.
2261 */
7d980def 2262void *consumer_thread_data_poll(void *data)
3bd1e081
MD
2263{
2264 int num_rdy, num_hup, high_prio, ret, i;
2265 struct pollfd *pollfd = NULL;
2266 /* local view of the streams */
c869f647 2267 struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL;
3bd1e081
MD
2268 /* local view of consumer_data.fds_count */
2269 int nb_fd = 0;
3bd1e081 2270 struct lttng_consumer_local_data *ctx = data;
00e2e675 2271 ssize_t len;
3bd1e081 2272
e7b994a3
DG
2273 rcu_register_thread();
2274
43c34bc3
DG
2275 data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
2276 if (data_ht == NULL) {
04bb2b64 2277 /* ENOMEM at this point. Better to bail out. */
43c34bc3
DG
2278 goto end;
2279 }
2280
effcf122 2281 local_stream = zmalloc(sizeof(struct lttng_consumer_stream));
3bd1e081
MD
2282
2283 while (1) {
2284 high_prio = 0;
2285 num_hup = 0;
2286
2287 /*
e4421fec 2288 * the fds set has been updated, we need to update our
3bd1e081
MD
2289 * local array as well
2290 */
2291 pthread_mutex_lock(&consumer_data.lock);
2292 if (consumer_data.need_update) {
2293 if (pollfd != NULL) {
2294 free(pollfd);
2295 pollfd = NULL;
2296 }
2297 if (local_stream != NULL) {
2298 free(local_stream);
2299 local_stream = NULL;
2300 }
2301
50f8ae69 2302 /* allocate for all fds + 1 for the consumer_data_pipe */
effcf122 2303 pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd));
3bd1e081 2304 if (pollfd == NULL) {
7a57cf92 2305 PERROR("pollfd malloc");
3bd1e081
MD
2306 pthread_mutex_unlock(&consumer_data.lock);
2307 goto end;
2308 }
2309
50f8ae69 2310 /* allocate for all fds + 1 for the consumer_data_pipe */
effcf122 2311 local_stream = zmalloc((consumer_data.stream_count + 1) *
3bd1e081
MD
2312 sizeof(struct lttng_consumer_stream));
2313 if (local_stream == NULL) {
7a57cf92 2314 PERROR("local_stream malloc");
3bd1e081
MD
2315 pthread_mutex_unlock(&consumer_data.lock);
2316 goto end;
2317 }
43c34bc3
DG
2318 ret = consumer_update_poll_array(ctx, &pollfd, local_stream,
2319 data_ht);
3bd1e081
MD
2320 if (ret < 0) {
2321 ERR("Error in allocating pollfd or local_outfds");
f73fabfd 2322 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR);
3bd1e081
MD
2323 pthread_mutex_unlock(&consumer_data.lock);
2324 goto end;
2325 }
2326 nb_fd = ret;
2327 consumer_data.need_update = 0;
2328 }
2329 pthread_mutex_unlock(&consumer_data.lock);
2330
4078b776
MD
2331 /* No FDs and consumer_quit, consumer_cleanup the thread */
2332 if (nb_fd == 0 && consumer_quit == 1) {
2333 goto end;
2334 }
3bd1e081 2335 /* poll on the array of fds */
88f2b785 2336 restart:
3bd1e081 2337 DBG("polling on %d fd", nb_fd + 1);
cb365c03 2338 num_rdy = poll(pollfd, nb_fd + 1, -1);
3bd1e081
MD
2339 DBG("poll num_rdy : %d", num_rdy);
2340 if (num_rdy == -1) {
88f2b785
MD
2341 /*
2342 * Restart interrupted system call.
2343 */
2344 if (errno == EINTR) {
2345 goto restart;
2346 }
7a57cf92 2347 PERROR("Poll error");
f73fabfd 2348 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR);
3bd1e081
MD
2349 goto end;
2350 } else if (num_rdy == 0) {
2351 DBG("Polling thread timed out");
2352 goto end;
2353 }
2354
3bd1e081 2355 /*
50f8ae69 2356 * If the consumer_data_pipe triggered poll go directly to the
00e2e675
DG
2357 * beginning of the loop to update the array. We want to prioritize
2358 * array update over low-priority reads.
3bd1e081 2359 */
509bb1cf 2360 if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) {
04fdd819 2361 size_t pipe_readlen;
04fdd819 2362
50f8ae69 2363 DBG("consumer_data_pipe wake up");
04fdd819
MD
2364 /* Consume 1 byte of pipe data */
2365 do {
50f8ae69 2366 pipe_readlen = read(ctx->consumer_data_pipe[0], &new_stream,
c869f647 2367 sizeof(new_stream));
04fdd819 2368 } while (pipe_readlen == -1 && errno == EINTR);
c869f647
DG
2369
2370 /*
2371 * If the stream is NULL, just ignore it. It's also possible that
2372 * the sessiond poll thread changed the consumer_quit state and is
2373 * waking us up to test it.
2374 */
2375 if (new_stream == NULL) {
8994307f 2376 validate_endpoint_status_data_stream();
c869f647
DG
2377 continue;
2378 }
2379
43c34bc3 2380 ret = consumer_add_stream(new_stream, data_ht);
c869f647
DG
2381 if (ret) {
2382 ERR("Consumer add stream %d failed. Continuing",
2383 new_stream->key);
2384 /*
2385 * At this point, if the add_stream fails, it is not in the
2386 * hash table thus passing the NULL value here.
2387 */
2388 consumer_del_stream(new_stream, NULL);
2389 }
2390
2391 /* Continue to update the local streams and handle prio ones */
3bd1e081
MD
2392 continue;
2393 }
2394
2395 /* Take care of high priority channels first. */
2396 for (i = 0; i < nb_fd; i++) {
9617607b
DG
2397 if (local_stream[i] == NULL) {
2398 continue;
2399 }
fb3a43a9 2400 if (pollfd[i].revents & POLLPRI) {
d41f73b7
MD
2401 DBG("Urgent read on fd %d", pollfd[i].fd);
2402 high_prio = 1;
4078b776 2403 len = ctx->on_buffer_ready(local_stream[i], ctx);
d41f73b7 2404 /* it's ok to have an unavailable sub-buffer */
b64403e3 2405 if (len < 0 && len != -EAGAIN && len != -ENODATA) {
ab1027f4
DG
2406 /* Clean the stream and free it. */
2407 consumer_del_stream(local_stream[i], data_ht);
9617607b 2408 local_stream[i] = NULL;
4078b776
MD
2409 } else if (len > 0) {
2410 local_stream[i]->data_read = 1;
d41f73b7 2411 }
3bd1e081
MD
2412 }
2413 }
2414
4078b776
MD
2415 /*
2416 * If we read high prio channel in this loop, try again
2417 * for more high prio data.
2418 */
2419 if (high_prio) {
3bd1e081
MD
2420 continue;
2421 }
2422
2423 /* Take care of low priority channels. */
4078b776 2424 for (i = 0; i < nb_fd; i++) {
9617607b
DG
2425 if (local_stream[i] == NULL) {
2426 continue;
2427 }
4078b776
MD
2428 if ((pollfd[i].revents & POLLIN) ||
2429 local_stream[i]->hangup_flush_done) {
4078b776
MD
2430 DBG("Normal read on fd %d", pollfd[i].fd);
2431 len = ctx->on_buffer_ready(local_stream[i], ctx);
2432 /* it's ok to have an unavailable sub-buffer */
b64403e3 2433 if (len < 0 && len != -EAGAIN && len != -ENODATA) {
ab1027f4
DG
2434 /* Clean the stream and free it. */
2435 consumer_del_stream(local_stream[i], data_ht);
9617607b 2436 local_stream[i] = NULL;
4078b776
MD
2437 } else if (len > 0) {
2438 local_stream[i]->data_read = 1;
2439 }
2440 }
2441 }
2442
2443 /* Handle hangup and errors */
2444 for (i = 0; i < nb_fd; i++) {
9617607b
DG
2445 if (local_stream[i] == NULL) {
2446 continue;
2447 }
4078b776
MD
2448 if (!local_stream[i]->hangup_flush_done
2449 && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL))
2450 && (consumer_data.type == LTTNG_CONSUMER32_UST
2451 || consumer_data.type == LTTNG_CONSUMER64_UST)) {
2452 DBG("fd %d is hup|err|nval. Attempting flush and read.",
9617607b 2453 pollfd[i].fd);
4078b776
MD
2454 lttng_ustconsumer_on_stream_hangup(local_stream[i]);
2455 /* Attempt read again, for the data we just flushed. */
2456 local_stream[i]->data_read = 1;
2457 }
2458 /*
2459 * If the poll flag is HUP/ERR/NVAL and we have
2460 * read no data in this pass, we can remove the
2461 * stream from its hash table.
2462 */
2463 if ((pollfd[i].revents & POLLHUP)) {
2464 DBG("Polling fd %d tells it has hung up.", pollfd[i].fd);
2465 if (!local_stream[i]->data_read) {
43c34bc3 2466 consumer_del_stream(local_stream[i], data_ht);
9617607b 2467 local_stream[i] = NULL;
4078b776
MD
2468 num_hup++;
2469 }
2470 } else if (pollfd[i].revents & POLLERR) {
2471 ERR("Error returned in polling fd %d.", pollfd[i].fd);
2472 if (!local_stream[i]->data_read) {
43c34bc3 2473 consumer_del_stream(local_stream[i], data_ht);
9617607b 2474 local_stream[i] = NULL;
4078b776
MD
2475 num_hup++;
2476 }
2477 } else if (pollfd[i].revents & POLLNVAL) {
2478 ERR("Polling fd %d tells fd is not open.", pollfd[i].fd);
2479 if (!local_stream[i]->data_read) {
43c34bc3 2480 consumer_del_stream(local_stream[i], data_ht);
9617607b 2481 local_stream[i] = NULL;
4078b776 2482 num_hup++;
3bd1e081
MD
2483 }
2484 }
9617607b
DG
2485 if (local_stream[i] != NULL) {
2486 local_stream[i]->data_read = 0;
2487 }
3bd1e081
MD
2488 }
2489 }
2490end:
2491 DBG("polling thread exiting");
2492 if (pollfd != NULL) {
2493 free(pollfd);
2494 pollfd = NULL;
2495 }
2496 if (local_stream != NULL) {
2497 free(local_stream);
2498 local_stream = NULL;
2499 }
fb3a43a9
DG
2500
2501 /*
2502 * Close the write side of the pipe so epoll_wait() in
7d980def
DG
2503 * consumer_thread_metadata_poll can catch it. The thread is monitoring the
2504 * read side of the pipe. If we close them both, epoll_wait strangely does
2505 * not return and could create a endless wait period if the pipe is the
2506 * only tracked fd in the poll set. The thread will take care of closing
2507 * the read side.
fb3a43a9 2508 */
f66c074c
DG
2509 ret = close(ctx->consumer_metadata_pipe[1]);
2510 if (ret < 0) {
2511 PERROR("close data pipe");
2512 }
fb3a43a9 2513
04bb2b64 2514 destroy_data_stream_ht(data_ht);
43c34bc3 2515
e7b994a3 2516 rcu_unregister_thread();
3bd1e081
MD
2517 return NULL;
2518}
2519
2520/*
2521 * This thread listens on the consumerd socket and receives the file
2522 * descriptors from the session daemon.
2523 */
7d980def 2524void *consumer_thread_sessiond_poll(void *data)
3bd1e081 2525{
d96f09c6 2526 int sock = -1, client_socket, ret;
3bd1e081
MD
2527 /*
2528 * structure to poll for incoming data on communication socket avoids
2529 * making blocking sockets.
2530 */
2531 struct pollfd consumer_sockpoll[2];
2532 struct lttng_consumer_local_data *ctx = data;
2533
e7b994a3
DG
2534 rcu_register_thread();
2535
3bd1e081
MD
2536 DBG("Creating command socket %s", ctx->consumer_command_sock_path);
2537 unlink(ctx->consumer_command_sock_path);
2538 client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path);
2539 if (client_socket < 0) {
2540 ERR("Cannot create command socket");
2541 goto end;
2542 }
2543
2544 ret = lttcomm_listen_unix_sock(client_socket);
2545 if (ret < 0) {
2546 goto end;
2547 }
2548
32258573 2549 DBG("Sending ready command to lttng-sessiond");
f73fabfd 2550 ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY);
3bd1e081
MD
2551 /* return < 0 on error, but == 0 is not fatal */
2552 if (ret < 0) {
32258573 2553 ERR("Error sending ready command to lttng-sessiond");
3bd1e081
MD
2554 goto end;
2555 }
2556
2557 ret = fcntl(client_socket, F_SETFL, O_NONBLOCK);
2558 if (ret < 0) {
7a57cf92 2559 PERROR("fcntl O_NONBLOCK");
3bd1e081
MD
2560 goto end;
2561 }
2562
2563 /* prepare the FDs to poll : to client socket and the should_quit pipe */
2564 consumer_sockpoll[0].fd = ctx->consumer_should_quit[0];
2565 consumer_sockpoll[0].events = POLLIN | POLLPRI;
2566 consumer_sockpoll[1].fd = client_socket;
2567 consumer_sockpoll[1].events = POLLIN | POLLPRI;
2568
2569 if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
2570 goto end;
2571 }
2572 DBG("Connection on client_socket");
2573
2574 /* Blocking call, waiting for transmission */
2575 sock = lttcomm_accept_unix_sock(client_socket);
2576 if (sock <= 0) {
2577 WARN("On accept");
2578 goto end;
2579 }
2580 ret = fcntl(sock, F_SETFL, O_NONBLOCK);
2581 if (ret < 0) {
7a57cf92 2582 PERROR("fcntl O_NONBLOCK");
3bd1e081
MD
2583 goto end;
2584 }
2585
d96f09c6
DG
2586 /* This socket is not useful anymore. */
2587 ret = close(client_socket);
2588 if (ret < 0) {
2589 PERROR("close client_socket");
2590 }
2591 client_socket = -1;
2592
3bd1e081
MD
2593 /* update the polling structure to poll on the established socket */
2594 consumer_sockpoll[1].fd = sock;
2595 consumer_sockpoll[1].events = POLLIN | POLLPRI;
2596
2597 while (1) {
2598 if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
2599 goto end;
2600 }
2601 DBG("Incoming command on sock");
2602 ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll);
2603 if (ret == -ENOENT) {
2604 DBG("Received STOP command");
2605 goto end;
2606 }
4cbc1a04
DG
2607 if (ret <= 0) {
2608 /*
2609 * This could simply be a session daemon quitting. Don't output
2610 * ERR() here.
2611 */
2612 DBG("Communication interrupted on command socket");
3bd1e081
MD
2613 goto end;
2614 }
2615 if (consumer_quit) {
2616 DBG("consumer_thread_receive_fds received quit from signal");
2617 goto end;
2618 }
2619 DBG("received fds on sock");
2620 }
2621end:
2622 DBG("consumer_thread_receive_fds exiting");
2623
2624 /*
2625 * when all fds have hung up, the polling thread
2626 * can exit cleanly
2627 */
2628 consumer_quit = 1;
2629
04fdd819 2630 /*
c869f647 2631 * Notify the data poll thread to poll back again and test the
8994307f 2632 * consumer_quit state that we just set so to quit gracefully.
04fdd819 2633 */
8994307f 2634 notify_thread_pipe(ctx->consumer_data_pipe[1]);
c869f647 2635
d96f09c6
DG
2636 /* Cleaning up possibly open sockets. */
2637 if (sock >= 0) {
2638 ret = close(sock);
2639 if (ret < 0) {
2640 PERROR("close sock sessiond poll");
2641 }
2642 }
2643 if (client_socket >= 0) {
2644 ret = close(sock);
2645 if (ret < 0) {
2646 PERROR("close client_socket sessiond poll");
2647 }
2648 }
2649
e7b994a3 2650 rcu_unregister_thread();
3bd1e081
MD
2651 return NULL;
2652}
d41f73b7 2653
4078b776 2654ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
d41f73b7
MD
2655 struct lttng_consumer_local_data *ctx)
2656{
74251bb8
DG
2657 ssize_t ret;
2658
2659 pthread_mutex_lock(&stream->lock);
2660
d41f73b7
MD
2661 switch (consumer_data.type) {
2662 case LTTNG_CONSUMER_KERNEL:
74251bb8
DG
2663 ret = lttng_kconsumer_read_subbuffer(stream, ctx);
2664 break;
7753dea8
MD
2665 case LTTNG_CONSUMER32_UST:
2666 case LTTNG_CONSUMER64_UST:
74251bb8
DG
2667 ret = lttng_ustconsumer_read_subbuffer(stream, ctx);
2668 break;
d41f73b7
MD
2669 default:
2670 ERR("Unknown consumer_data type");
2671 assert(0);
74251bb8
DG
2672 ret = -ENOSYS;
2673 break;
d41f73b7 2674 }
74251bb8
DG
2675
2676 pthread_mutex_unlock(&stream->lock);
2677 return ret;
d41f73b7
MD
2678}
2679
2680int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream)
2681{
2682 switch (consumer_data.type) {
2683 case LTTNG_CONSUMER_KERNEL:
2684 return lttng_kconsumer_on_recv_stream(stream);
7753dea8
MD
2685 case LTTNG_CONSUMER32_UST:
2686 case LTTNG_CONSUMER64_UST:
d41f73b7
MD
2687 return lttng_ustconsumer_on_recv_stream(stream);
2688 default:
2689 ERR("Unknown consumer_data type");
2690 assert(0);
2691 return -ENOSYS;
2692 }
2693}
e4421fec
DG
2694
2695/*
2696 * Allocate and set consumer data hash tables.
2697 */
2698void lttng_consumer_init(void)
2699{
e4421fec 2700 consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
00e2e675 2701 consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
53632229 2702 consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
46e6455f 2703 relayd_session_id_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
e4421fec 2704}
7735ef9e
DG
2705
2706/*
2707 * Process the ADD_RELAYD command receive by a consumer.
2708 *
2709 * This will create a relayd socket pair and add it to the relayd hash table.
2710 * The caller MUST acquire a RCU read side lock before calling it.
2711 */
2712int consumer_add_relayd_socket(int net_seq_idx, int sock_type,
2713 struct lttng_consumer_local_data *ctx, int sock,
46e6455f
DG
2714 struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock,
2715 unsigned int sessiond_id)
7735ef9e 2716{
cd2b09ed 2717 int fd = -1, ret = -1, relayd_created = 0;
f50f23d9 2718 enum lttng_error_code ret_code = LTTNG_OK;
7735ef9e 2719 struct consumer_relayd_sock_pair *relayd;
46e6455f 2720 struct consumer_relayd_session_id *relayd_id_node;
7735ef9e
DG
2721
2722 DBG("Consumer adding relayd socket (idx: %d)", net_seq_idx);
2723
f50f23d9
DG
2724 /* First send a status message before receiving the fds. */
2725 ret = consumer_send_status_msg(sock, ret_code);
2726 if (ret < 0) {
2727 /* Somehow, the session daemon is not responding anymore. */
2728 goto error;
2729 }
2730
7735ef9e
DG
2731 /* Get relayd reference if exists. */
2732 relayd = consumer_find_relayd(net_seq_idx);
2733 if (relayd == NULL) {
2734 /* Not found. Allocate one. */
2735 relayd = consumer_allocate_relayd_sock_pair(net_seq_idx);
2736 if (relayd == NULL) {
f73fabfd 2737 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
7735ef9e
DG
2738 goto error;
2739 }
f7079f67 2740 relayd->sessiond_session_id = (uint64_t) sessiond_id;
cd2b09ed 2741 relayd_created = 1;
7735ef9e
DG
2742 }
2743
2744 /* Poll on consumer socket. */
2745 if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
2746 ret = -EINTR;
2747 goto error;
2748 }
2749
2750 /* Get relayd socket from session daemon */
2751 ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1);
2752 if (ret != sizeof(fd)) {
f73fabfd 2753 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD);
7735ef9e 2754 ret = -1;
4028eeb9 2755 fd = -1; /* Just in case it gets set with an invalid value. */
7735ef9e
DG
2756 goto error;
2757 }
2758
f50f23d9
DG
2759 /* We have the fds without error. Send status back. */
2760 ret = consumer_send_status_msg(sock, ret_code);
2761 if (ret < 0) {
2762 /* Somehow, the session daemon is not responding anymore. */
2763 goto error;
2764 }
2765
7735ef9e
DG
2766 /* Copy socket information and received FD */
2767 switch (sock_type) {
2768 case LTTNG_STREAM_CONTROL:
2769 /* Copy received lttcomm socket */
2770 lttcomm_copy_sock(&relayd->control_sock, relayd_sock);
2771 ret = lttcomm_create_sock(&relayd->control_sock);
4028eeb9
DG
2772 /* Immediately try to close the created socket if valid. */
2773 if (relayd->control_sock.fd >= 0) {
2774 if (close(relayd->control_sock.fd)) {
2775 PERROR("close relayd control socket");
2776 }
7735ef9e 2777 }
4028eeb9 2778 /* Handle create_sock error. */
f66c074c 2779 if (ret < 0) {
4028eeb9 2780 goto error;
f66c074c 2781 }
7735ef9e
DG
2782
2783 /* Assign new file descriptor */
2784 relayd->control_sock.fd = fd;
c5b6f4f0
DG
2785
2786 /*
2787 * Create a session on the relayd and store the returned id. No need to
2788 * grab the socket lock since the relayd object is not yet visible.
2789 */
2790 ret = relayd_create_session(&relayd->control_sock,
f7079f67 2791 &relayd->relayd_session_id);
c5b6f4f0
DG
2792 if (ret < 0) {
2793 goto error;
2794 }
2795
46e6455f
DG
2796 /* Set up a relayd session id node. */
2797 relayd_id_node = zmalloc(sizeof(struct consumer_relayd_session_id));
2798 if (!relayd_id_node) {
2799 PERROR("zmalloc relayd id node");
2800 goto error;
2801 }
2802
f7079f67 2803 relayd_id_node->relayd_id = relayd->relayd_session_id;
46e6455f
DG
2804 relayd_id_node->sessiond_id = (uint64_t) sessiond_id;
2805
f7079f67 2806 /* Indexed by session id of the sessiond. */
46e6455f
DG
2807 lttng_ht_node_init_ulong(&relayd_id_node->node,
2808 relayd_id_node->sessiond_id);
2809 rcu_read_lock();
2810 lttng_ht_add_unique_ulong(relayd_session_id_ht, &relayd_id_node->node);
2811 rcu_read_unlock();
2812
7735ef9e
DG
2813 break;
2814 case LTTNG_STREAM_DATA:
2815 /* Copy received lttcomm socket */
2816 lttcomm_copy_sock(&relayd->data_sock, relayd_sock);
2817 ret = lttcomm_create_sock(&relayd->data_sock);
4028eeb9
DG
2818 /* Immediately try to close the created socket if valid. */
2819 if (relayd->data_sock.fd >= 0) {
2820 if (close(relayd->data_sock.fd)) {
2821 PERROR("close relayd data socket");
2822 }
7735ef9e 2823 }
4028eeb9 2824 /* Handle create_sock error. */
f66c074c 2825 if (ret < 0) {
4028eeb9 2826 goto error;
f66c074c 2827 }
7735ef9e
DG
2828
2829 /* Assign new file descriptor */
2830 relayd->data_sock.fd = fd;
2831 break;
2832 default:
2833 ERR("Unknown relayd socket type (%d)", sock_type);
2834 goto error;
2835 }
2836
2837 DBG("Consumer %s socket created successfully with net idx %d (fd: %d)",
2838 sock_type == LTTNG_STREAM_CONTROL ? "control" : "data",
2839 relayd->net_seq_idx, fd);
2840
2841 /*
2842 * Add relayd socket pair to consumer data hashtable. If object already
2843 * exists or on error, the function gracefully returns.
2844 */
d09e1200 2845 add_relayd(relayd);
7735ef9e
DG
2846
2847 /* All good! */
4028eeb9 2848 return 0;
7735ef9e
DG
2849
2850error:
4028eeb9
DG
2851 /* Close received socket if valid. */
2852 if (fd >= 0) {
2853 if (close(fd)) {
2854 PERROR("close received socket");
2855 }
2856 }
cd2b09ed
DG
2857
2858 if (relayd_created) {
2859 /* We just want to cleanup. Ignore ret value. */
2860 (void) relayd_close(&relayd->control_sock);
2861 (void) relayd_close(&relayd->data_sock);
2862 free(relayd);
2863 }
2864
7735ef9e
DG
2865 return ret;
2866}
ca22feea 2867
4e9a4686
DG
2868/*
2869 * Try to lock the stream mutex.
2870 *
2871 * On success, 1 is returned else 0 indicating that the mutex is NOT lock.
2872 */
2873static int stream_try_lock(struct lttng_consumer_stream *stream)
2874{
2875 int ret;
2876
2877 assert(stream);
2878
2879 /*
2880 * Try to lock the stream mutex. On failure, we know that the stream is
2881 * being used else where hence there is data still being extracted.
2882 */
2883 ret = pthread_mutex_trylock(&stream->lock);
2884 if (ret) {
2885 /* For both EBUSY and EINVAL error, the mutex is NOT locked. */
2886 ret = 0;
2887 goto end;
2888 }
2889
2890 ret = 1;
2891
2892end:
2893 return ret;
2894}
2895
f7079f67
DG
2896/*
2897 * Search for a relayd associated to the session id and return the reference.
2898 *
2899 * A rcu read side lock MUST be acquire before calling this function and locked
2900 * until the relayd object is no longer necessary.
2901 */
2902static struct consumer_relayd_sock_pair *find_relayd_by_session_id(uint64_t id)
2903{
2904 struct lttng_ht_iter iter;
2905 struct lttng_ht_node_ulong *node;
2906 struct consumer_relayd_sock_pair *relayd = NULL;
2907 struct consumer_relayd_session_id *session_id_map;
2908
2909 /* Get the session id map. */
2910 lttng_ht_lookup(relayd_session_id_ht, (void *)((unsigned long) id), &iter);
2911 node = lttng_ht_iter_get_node_ulong(&iter);
2912 if (node == NULL) {
2913 goto end;
2914 }
2915
2916 session_id_map = caa_container_of(node, struct consumer_relayd_session_id,
2917 node);
2918
2919 /* Iterate over all relayd since they are indexed by net_seq_idx. */
2920 cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd,
2921 node.node) {
2922 if (relayd->relayd_session_id == session_id_map->relayd_id) {
2923 /* Found the relayd. There can be only one per id. */
2924 break;
2925 }
2926 }
2927
2928end:
2929 return relayd;
2930}
2931
ca22feea
DG
2932/*
2933 * Check if for a given session id there is still data needed to be extract
2934 * from the buffers.
2935 *
6d805429 2936 * Return 1 if data is pending or else 0 meaning ready to be read.
ca22feea 2937 */
6d805429 2938int consumer_data_pending(uint64_t id)
ca22feea
DG
2939{
2940 int ret;
2941 struct lttng_ht_iter iter;
2942 struct lttng_ht *ht;
2943 struct lttng_consumer_stream *stream;
f7079f67 2944 struct consumer_relayd_sock_pair *relayd = NULL;
6d805429 2945 int (*data_pending)(struct lttng_consumer_stream *);
ca22feea 2946
6d805429 2947 DBG("Consumer data pending command on session id %" PRIu64, id);
ca22feea 2948
6f6eda74 2949 rcu_read_lock();
ca22feea
DG
2950 pthread_mutex_lock(&consumer_data.lock);
2951
2952 switch (consumer_data.type) {
2953 case LTTNG_CONSUMER_KERNEL:
6d805429 2954 data_pending = lttng_kconsumer_data_pending;
ca22feea
DG
2955 break;
2956 case LTTNG_CONSUMER32_UST:
2957 case LTTNG_CONSUMER64_UST:
6d805429 2958 data_pending = lttng_ustconsumer_data_pending;
ca22feea
DG
2959 break;
2960 default:
2961 ERR("Unknown consumer data type");
2962 assert(0);
2963 }
2964
2965 /* Ease our life a bit */
2966 ht = consumer_data.stream_list_ht;
2967
f7079f67
DG
2968 relayd = find_relayd_by_session_id(id);
2969 if (relayd) {
2970 /* Send init command for data pending. */
2971 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
2972 ret = relayd_begin_data_pending(&relayd->control_sock,
2973 relayd->relayd_session_id);
2974 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
2975 if (ret < 0) {
2976 /* Communication error thus the relayd so no data pending. */
2977 goto data_not_pending;
2978 }
2979 }
2980
c8f59ee5 2981 cds_lfht_for_each_entry_duplicate(ht->ht,
b6314938 2982 ht->hash_fct((void *)((unsigned long) id), lttng_ht_seed),
ca22feea
DG
2983 ht->match_fct, (void *)((unsigned long) id),
2984 &iter.iter, stream, node_session_id.node) {
4e9a4686
DG
2985 /* If this call fails, the stream is being used hence data pending. */
2986 ret = stream_try_lock(stream);
2987 if (!ret) {
f7079f67 2988 goto data_pending;
ca22feea 2989 }
ca22feea 2990
4e9a4686
DG
2991 /*
2992 * A removed node from the hash table indicates that the stream has
2993 * been deleted thus having a guarantee that the buffers are closed
2994 * on the consumer side. However, data can still be transmitted
2995 * over the network so don't skip the relayd check.
2996 */
2997 ret = cds_lfht_is_node_deleted(&stream->node.node);
2998 if (!ret) {
2999 /* Check the stream if there is data in the buffers. */
6d805429
DG
3000 ret = data_pending(stream);
3001 if (ret == 1) {
4e9a4686 3002 pthread_mutex_unlock(&stream->lock);
f7079f67 3003 goto data_pending;
4e9a4686
DG
3004 }
3005 }
3006
3007 /* Relayd check */
f7079f67 3008 if (relayd) {
c8f59ee5
DG
3009 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
3010 if (stream->metadata_flag) {
3011 ret = relayd_quiescent_control(&relayd->control_sock);
3012 } else {
6d805429 3013 ret = relayd_data_pending(&relayd->control_sock,
c8f59ee5
DG
3014 stream->relayd_stream_id, stream->next_net_seq_num);
3015 }
3016 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
6d805429 3017 if (ret == 1) {
4e9a4686 3018 pthread_mutex_unlock(&stream->lock);
f7079f67 3019 goto data_pending;
c8f59ee5
DG
3020 }
3021 }
4e9a4686 3022 pthread_mutex_unlock(&stream->lock);
c8f59ee5 3023 }
ca22feea 3024
f7079f67
DG
3025 if (relayd) {
3026 unsigned int is_data_inflight = 0;
3027
3028 /* Send init command for data pending. */
3029 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
3030 ret = relayd_end_data_pending(&relayd->control_sock,
3031 relayd->relayd_session_id, &is_data_inflight);
3032 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
3033 if (ret < 0 || !is_data_inflight) {
3034 /* On error or if NO data inflight, no data is pending. */
3035 goto data_not_pending;
3036 }
3037 }
3038
ca22feea 3039 /*
f7079f67
DG
3040 * Finding _no_ node in the hash table and no inflight data means that the
3041 * stream(s) have been removed thus data is guaranteed to be available for
3042 * analysis from the trace files.
ca22feea
DG
3043 */
3044
f7079f67 3045data_not_pending:
ca22feea
DG
3046 /* Data is available to be read by a viewer. */
3047 pthread_mutex_unlock(&consumer_data.lock);
c8f59ee5 3048 rcu_read_unlock();
6d805429 3049 return 0;
ca22feea 3050
f7079f67 3051data_pending:
ca22feea
DG
3052 /* Data is still being extracted from buffers. */
3053 pthread_mutex_unlock(&consumer_data.lock);
c8f59ee5 3054 rcu_read_unlock();
6d805429 3055 return 1;
ca22feea 3056}
f50f23d9
DG
3057
3058/*
3059 * Send a ret code status message to the sessiond daemon.
3060 *
3061 * Return the sendmsg() return value.
3062 */
3063int consumer_send_status_msg(int sock, int ret_code)
3064{
3065 struct lttcomm_consumer_status_msg msg;
3066
3067 msg.ret_code = ret_code;
3068
3069 return lttcomm_send_unix_sock(sock, &msg, sizeof(msg));
3070}
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