Fix: Handle the unary bitwise negation operator (~) in the XML printer
[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 *
d14d33bf
AM
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 *
d14d33bf
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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>
fb3a43a9
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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
50/* timeout parameter, to control the polling thread grace period. */
51int consumer_poll_timeout = -1;
52
53/*
54 * Flag to inform the polling thread to quit when all fd hung up. Updated by
55 * the consumer_thread_receive_fds when it notices that all fds has hung up.
56 * Also updated by the signal handler (consumer_should_exit()). Read by the
57 * polling threads.
58 */
a98dae5f 59volatile int consumer_quit;
3bd1e081 60
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61/*
62 * The following two hash tables are visible by all threads which are separated
63 * in different source files.
64 *
65 * Global hash table containing respectively metadata and data streams. The
66 * stream element in this ht should only be updated by the metadata poll thread
67 * for the metadata and the data poll thread for the data.
68 */
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69struct lttng_ht *metadata_ht;
70struct lttng_ht *data_ht;
43c34bc3 71
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72/*
73 * Find a stream. The consumer_data.lock must be locked during this
74 * call.
75 */
8389e4f8
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76static struct lttng_consumer_stream *consumer_find_stream(int key,
77 struct lttng_ht *ht)
3bd1e081 78{
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79 struct lttng_ht_iter iter;
80 struct lttng_ht_node_ulong *node;
81 struct lttng_consumer_stream *stream = NULL;
3bd1e081 82
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83 assert(ht);
84
7ad0a0cb 85 /* Negative keys are lookup failures */
7a57cf92 86 if (key < 0) {
7ad0a0cb 87 return NULL;
7a57cf92 88 }
e4421fec 89
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90 rcu_read_lock();
91
8389e4f8 92 lttng_ht_lookup(ht, (void *)((unsigned long) key), &iter);
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93 node = lttng_ht_iter_get_node_ulong(&iter);
94 if (node != NULL) {
95 stream = caa_container_of(node, struct lttng_consumer_stream, node);
3bd1e081 96 }
e4421fec 97
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98 rcu_read_unlock();
99
e4421fec 100 return stream;
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101}
102
c869f647 103void consumer_steal_stream_key(int key, struct lttng_ht *ht)
7ad0a0cb
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104{
105 struct lttng_consumer_stream *stream;
106
04253271 107 rcu_read_lock();
8389e4f8 108 stream = consumer_find_stream(key, ht);
04253271 109 if (stream) {
7ad0a0cb 110 stream->key = -1;
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111 /*
112 * We don't want the lookup to match, but we still need
113 * to iterate on this stream when iterating over the hash table. Just
114 * change the node key.
115 */
116 stream->node.key = -1;
117 }
118 rcu_read_unlock();
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119}
120
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121static struct lttng_consumer_channel *consumer_find_channel(int key)
122{
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123 struct lttng_ht_iter iter;
124 struct lttng_ht_node_ulong *node;
125 struct lttng_consumer_channel *channel = NULL;
3bd1e081 126
7ad0a0cb 127 /* Negative keys are lookup failures */
7a57cf92 128 if (key < 0) {
7ad0a0cb 129 return NULL;
7a57cf92 130 }
e4421fec 131
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132 rcu_read_lock();
133
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134 lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key),
135 &iter);
136 node = lttng_ht_iter_get_node_ulong(&iter);
137 if (node != NULL) {
138 channel = caa_container_of(node, struct lttng_consumer_channel, node);
3bd1e081 139 }
e4421fec 140
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141 rcu_read_unlock();
142
e4421fec 143 return channel;
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144}
145
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146static void consumer_steal_channel_key(int key)
147{
148 struct lttng_consumer_channel *channel;
149
04253271 150 rcu_read_lock();
7ad0a0cb 151 channel = consumer_find_channel(key);
04253271 152 if (channel) {
7ad0a0cb 153 channel->key = -1;
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MD
154 /*
155 * We don't want the lookup to match, but we still need
156 * to iterate on this channel when iterating over the hash table. Just
157 * change the node key.
158 */
159 channel->node.key = -1;
160 }
161 rcu_read_unlock();
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162}
163
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164static
165void consumer_free_stream(struct rcu_head *head)
166{
167 struct lttng_ht_node_ulong *node =
168 caa_container_of(head, struct lttng_ht_node_ulong, head);
169 struct lttng_consumer_stream *stream =
170 caa_container_of(node, struct lttng_consumer_stream, node);
171
172 free(stream);
173}
174
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175/*
176 * RCU protected relayd socket pair free.
177 */
178static void consumer_rcu_free_relayd(struct rcu_head *head)
179{
180 struct lttng_ht_node_ulong *node =
181 caa_container_of(head, struct lttng_ht_node_ulong, head);
182 struct consumer_relayd_sock_pair *relayd =
183 caa_container_of(node, struct consumer_relayd_sock_pair, node);
184
185 free(relayd);
186}
187
188/*
189 * Destroy and free relayd socket pair object.
190 *
191 * This function MUST be called with the consumer_data lock acquired.
192 */
d09e1200 193static void destroy_relayd(struct consumer_relayd_sock_pair *relayd)
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194{
195 int ret;
196 struct lttng_ht_iter iter;
197
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198 if (relayd == NULL) {
199 return;
200 }
201
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202 DBG("Consumer destroy and close relayd socket pair");
203
204 iter.iter.node = &relayd->node.node;
205 ret = lttng_ht_del(consumer_data.relayd_ht, &iter);
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206 if (ret != 0) {
207 /* We assume the relayd was already destroyed */
208 return;
209 }
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210
211 /* Close all sockets */
212 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
213 (void) relayd_close(&relayd->control_sock);
214 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
215 (void) relayd_close(&relayd->data_sock);
216
217 /* RCU free() call */
218 call_rcu(&relayd->node.head, consumer_rcu_free_relayd);
219}
220
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221/*
222 * Flag a relayd socket pair for destruction. Destroy it if the refcount
223 * reaches zero.
224 *
225 * RCU read side lock MUST be aquired before calling this function.
226 */
227void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd)
228{
229 assert(relayd);
230
231 /* Set destroy flag for this object */
232 uatomic_set(&relayd->destroy_flag, 1);
233
234 /* Destroy the relayd if refcount is 0 */
235 if (uatomic_read(&relayd->refcount) == 0) {
d09e1200 236 destroy_relayd(relayd);
a6ba4fe1
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237 }
238}
239
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240/*
241 * Remove a stream from the global list protected by a mutex. This
242 * function is also responsible for freeing its data structures.
243 */
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244void consumer_del_stream(struct lttng_consumer_stream *stream,
245 struct lttng_ht *ht)
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246{
247 int ret;
e4421fec 248 struct lttng_ht_iter iter;
3bd1e081 249 struct lttng_consumer_channel *free_chan = NULL;
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250 struct consumer_relayd_sock_pair *relayd;
251
252 assert(stream);
3bd1e081 253
e316aad5
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254 if (ht == NULL) {
255 /* Means the stream was allocated but not successfully added */
256 goto free_stream;
257 }
258
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259 pthread_mutex_lock(&consumer_data.lock);
260
261 switch (consumer_data.type) {
262 case LTTNG_CONSUMER_KERNEL:
263 if (stream->mmap_base != NULL) {
264 ret = munmap(stream->mmap_base, stream->mmap_len);
265 if (ret != 0) {
7a57cf92 266 PERROR("munmap");
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267 }
268 }
269 break;
7753dea8
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270 case LTTNG_CONSUMER32_UST:
271 case LTTNG_CONSUMER64_UST:
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272 lttng_ustconsumer_del_stream(stream);
273 break;
274 default:
275 ERR("Unknown consumer_data type");
276 assert(0);
277 goto end;
278 }
279
6065ceec 280 rcu_read_lock();
04253271 281 iter.iter.node = &stream->node.node;
e316aad5 282 ret = lttng_ht_del(ht, &iter);
04253271 283 assert(!ret);
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284
285 /* Remove node session id from the consumer_data stream ht */
286 iter.iter.node = &stream->node_session_id.node;
287 ret = lttng_ht_del(consumer_data.stream_list_ht, &iter);
288 assert(!ret);
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289 rcu_read_unlock();
290
50f8ae69 291 assert(consumer_data.stream_count > 0);
3bd1e081 292 consumer_data.stream_count--;
50f8ae69 293
3bd1e081 294 if (stream->out_fd >= 0) {
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295 ret = close(stream->out_fd);
296 if (ret) {
297 PERROR("close");
298 }
3bd1e081 299 }
b5c5fc29 300 if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) {
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MD
301 ret = close(stream->wait_fd);
302 if (ret) {
303 PERROR("close");
304 }
3bd1e081 305 }
2c1dd183 306 if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) {
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307 ret = close(stream->shm_fd);
308 if (ret) {
309 PERROR("close");
310 }
3bd1e081 311 }
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312
313 /* Check and cleanup relayd */
b0b335c8 314 rcu_read_lock();
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315 relayd = consumer_find_relayd(stream->net_seq_idx);
316 if (relayd != NULL) {
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MD
317 uatomic_dec(&relayd->refcount);
318 assert(uatomic_read(&relayd->refcount) >= 0);
173af62f 319
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320 /* Closing streams requires to lock the control socket. */
321 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
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322 ret = relayd_send_close_stream(&relayd->control_sock,
323 stream->relayd_stream_id,
324 stream->next_net_seq_num - 1);
3f8e211f 325 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
173af62f 326 if (ret < 0) {
a4b92340
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327 DBG("Unable to close stream on the relayd. Continuing");
328 /*
329 * Continue here. There is nothing we can do for the relayd.
330 * Chances are that the relayd has closed the socket so we just
331 * continue cleaning up.
332 */
173af62f
DG
333 }
334
335 /* Both conditions are met, we destroy the relayd. */
336 if (uatomic_read(&relayd->refcount) == 0 &&
337 uatomic_read(&relayd->destroy_flag)) {
d09e1200 338 destroy_relayd(relayd);
00e2e675 339 }
00e2e675 340 }
b0b335c8 341 rcu_read_unlock();
00e2e675 342
c30aaa51
MD
343 uatomic_dec(&stream->chan->refcount);
344 if (!uatomic_read(&stream->chan->refcount)
345 && !uatomic_read(&stream->chan->nb_init_streams)) {
3bd1e081 346 free_chan = stream->chan;
00e2e675
DG
347 }
348
3bd1e081
MD
349end:
350 consumer_data.need_update = 1;
351 pthread_mutex_unlock(&consumer_data.lock);
352
c30aaa51 353 if (free_chan) {
3bd1e081 354 consumer_del_channel(free_chan);
c30aaa51 355 }
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356
357free_stream:
358 call_rcu(&stream->node.head, consumer_free_stream);
3bd1e081
MD
359}
360
361struct lttng_consumer_stream *consumer_allocate_stream(
362 int channel_key, int stream_key,
363 int shm_fd, int wait_fd,
364 enum lttng_consumer_stream_state state,
365 uint64_t mmap_len,
366 enum lttng_event_output output,
6df2e2c9
MD
367 const char *path_name,
368 uid_t uid,
00e2e675
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369 gid_t gid,
370 int net_index,
c80048c6 371 int metadata_flag,
53632229 372 uint64_t session_id,
c80048c6 373 int *alloc_ret)
3bd1e081
MD
374{
375 struct lttng_consumer_stream *stream;
3bd1e081 376
effcf122 377 stream = zmalloc(sizeof(*stream));
3bd1e081 378 if (stream == NULL) {
7a57cf92 379 PERROR("malloc struct lttng_consumer_stream");
c80048c6 380 *alloc_ret = -ENOMEM;
7a57cf92 381 goto end;
3bd1e081 382 }
7a57cf92
DG
383
384 /*
385 * Get stream's channel reference. Needed when adding the stream to the
386 * global hash table.
387 */
3bd1e081
MD
388 stream->chan = consumer_find_channel(channel_key);
389 if (!stream->chan) {
c80048c6 390 *alloc_ret = -ENOENT;
7a57cf92 391 ERR("Unable to find channel for stream %d", stream_key);
c80048c6 392 goto error;
3bd1e081 393 }
e316aad5 394
3bd1e081
MD
395 stream->key = stream_key;
396 stream->shm_fd = shm_fd;
397 stream->wait_fd = wait_fd;
398 stream->out_fd = -1;
399 stream->out_fd_offset = 0;
400 stream->state = state;
401 stream->mmap_len = mmap_len;
402 stream->mmap_base = NULL;
403 stream->output = output;
6df2e2c9
MD
404 stream->uid = uid;
405 stream->gid = gid;
00e2e675
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406 stream->net_seq_idx = net_index;
407 stream->metadata_flag = metadata_flag;
53632229 408 stream->session_id = session_id;
00e2e675
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409 strncpy(stream->path_name, path_name, sizeof(stream->path_name));
410 stream->path_name[sizeof(stream->path_name) - 1] = '\0';
53632229 411 pthread_mutex_init(&stream->lock, NULL);
58b1f425
DG
412
413 /*
414 * Index differently the metadata node because the thread is using an
415 * internal hash table to match streams in the metadata_ht to the epoll set
416 * file descriptor.
417 */
418 if (metadata_flag) {
419 lttng_ht_node_init_ulong(&stream->node, stream->wait_fd);
420 } else {
421 lttng_ht_node_init_ulong(&stream->node, stream->key);
422 }
c30aaa51 423
53632229
DG
424 /* Init session id node with the stream session id */
425 lttng_ht_node_init_ulong(&stream->node_session_id, stream->session_id);
426
c869f647
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427 /*
428 * The cpu number is needed before using any ustctl_* actions. Ignored for
429 * the kernel so the value does not matter.
430 */
431 pthread_mutex_lock(&consumer_data.lock);
432 stream->cpu = stream->chan->cpucount++;
433 pthread_mutex_unlock(&consumer_data.lock);
434
c30aaa51 435 DBG3("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu,"
53632229
DG
436 " out_fd %d, net_seq_idx %d, session_id %" PRIu64,
437 stream->path_name, stream->key, stream->shm_fd, stream->wait_fd,
c30aaa51 438 (unsigned long long) stream->mmap_len, stream->out_fd,
53632229 439 stream->net_seq_idx, stream->session_id);
3bd1e081 440 return stream;
c80048c6
MD
441
442error:
443 free(stream);
7a57cf92 444end:
c80048c6 445 return NULL;
3bd1e081
MD
446}
447
448/*
449 * Add a stream to the global list protected by a mutex.
450 */
43c34bc3
DG
451static int consumer_add_stream(struct lttng_consumer_stream *stream,
452 struct lttng_ht *ht)
3bd1e081
MD
453{
454 int ret = 0;
00e2e675 455 struct consumer_relayd_sock_pair *relayd;
3bd1e081 456
e316aad5 457 assert(stream);
43c34bc3 458 assert(ht);
c77fc10a 459
e316aad5
DG
460 DBG3("Adding consumer stream %d", stream->key);
461
462 pthread_mutex_lock(&consumer_data.lock);
b0b335c8 463 rcu_read_lock();
e316aad5 464
43c34bc3
DG
465 /* Steal stream identifier to avoid having streams with the same key */
466 consumer_steal_stream_key(stream->key, ht);
467
468 lttng_ht_add_unique_ulong(ht, &stream->node);
00e2e675 469
ca22feea
DG
470 /*
471 * Add stream to the stream_list_ht of the consumer data. No need to steal
472 * the key since the HT does not use it and we allow to add redundant keys
473 * into this table.
474 */
475 lttng_ht_add_ulong(consumer_data.stream_list_ht, &stream->node_session_id);
476
00e2e675
DG
477 /* Check and cleanup relayd */
478 relayd = consumer_find_relayd(stream->net_seq_idx);
479 if (relayd != NULL) {
b0b335c8 480 uatomic_inc(&relayd->refcount);
00e2e675
DG
481 }
482
e316aad5
DG
483 /* Update channel refcount once added without error(s). */
484 uatomic_inc(&stream->chan->refcount);
485
486 /*
487 * When nb_init_streams reaches 0, we don't need to trigger any action in
488 * terms of destroying the associated channel, because the action that
489 * causes the count to become 0 also causes a stream to be added. The
490 * channel deletion will thus be triggered by the following removal of this
491 * stream.
492 */
493 if (uatomic_read(&stream->chan->nb_init_streams) > 0) {
494 uatomic_dec(&stream->chan->nb_init_streams);
495 }
496
497 /* Update consumer data once the node is inserted. */
3bd1e081
MD
498 consumer_data.stream_count++;
499 consumer_data.need_update = 1;
500
e316aad5 501 rcu_read_unlock();
3bd1e081 502 pthread_mutex_unlock(&consumer_data.lock);
702b1ea4 503
3bd1e081
MD
504 return ret;
505}
506
00e2e675 507/*
3f8e211f
DG
508 * Add relayd socket to global consumer data hashtable. RCU read side lock MUST
509 * be acquired before calling this.
00e2e675 510 */
d09e1200 511static int add_relayd(struct consumer_relayd_sock_pair *relayd)
00e2e675
DG
512{
513 int ret = 0;
514 struct lttng_ht_node_ulong *node;
515 struct lttng_ht_iter iter;
516
517 if (relayd == NULL) {
518 ret = -1;
519 goto end;
520 }
521
00e2e675
DG
522 lttng_ht_lookup(consumer_data.relayd_ht,
523 (void *)((unsigned long) relayd->net_seq_idx), &iter);
524 node = lttng_ht_iter_get_node_ulong(&iter);
525 if (node != NULL) {
00e2e675
DG
526 /* Relayd already exist. Ignore the insertion */
527 goto end;
528 }
529 lttng_ht_add_unique_ulong(consumer_data.relayd_ht, &relayd->node);
530
00e2e675
DG
531end:
532 return ret;
533}
534
535/*
536 * Allocate and return a consumer relayd socket.
537 */
538struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair(
539 int net_seq_idx)
540{
541 struct consumer_relayd_sock_pair *obj = NULL;
542
543 /* Negative net sequence index is a failure */
544 if (net_seq_idx < 0) {
545 goto error;
546 }
547
548 obj = zmalloc(sizeof(struct consumer_relayd_sock_pair));
549 if (obj == NULL) {
550 PERROR("zmalloc relayd sock");
551 goto error;
552 }
553
554 obj->net_seq_idx = net_seq_idx;
555 obj->refcount = 0;
173af62f 556 obj->destroy_flag = 0;
00e2e675
DG
557 lttng_ht_node_init_ulong(&obj->node, obj->net_seq_idx);
558 pthread_mutex_init(&obj->ctrl_sock_mutex, NULL);
559
560error:
561 return obj;
562}
563
564/*
565 * Find a relayd socket pair in the global consumer data.
566 *
567 * Return the object if found else NULL.
b0b335c8
MD
568 * RCU read-side lock must be held across this call and while using the
569 * returned object.
00e2e675
DG
570 */
571struct consumer_relayd_sock_pair *consumer_find_relayd(int key)
572{
573 struct lttng_ht_iter iter;
574 struct lttng_ht_node_ulong *node;
575 struct consumer_relayd_sock_pair *relayd = NULL;
576
577 /* Negative keys are lookup failures */
578 if (key < 0) {
579 goto error;
580 }
581
00e2e675
DG
582 lttng_ht_lookup(consumer_data.relayd_ht, (void *)((unsigned long) key),
583 &iter);
584 node = lttng_ht_iter_get_node_ulong(&iter);
585 if (node != NULL) {
586 relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node);
587 }
588
00e2e675
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589error:
590 return relayd;
591}
592
593/*
594 * Handle stream for relayd transmission if the stream applies for network
595 * streaming where the net sequence index is set.
596 *
597 * Return destination file descriptor or negative value on error.
598 */
6197aea7 599static int write_relayd_stream_header(struct lttng_consumer_stream *stream,
1d4dfdef
DG
600 size_t data_size, unsigned long padding,
601 struct consumer_relayd_sock_pair *relayd)
00e2e675
DG
602{
603 int outfd = -1, ret;
00e2e675
DG
604 struct lttcomm_relayd_data_hdr data_hdr;
605
606 /* Safety net */
607 assert(stream);
6197aea7 608 assert(relayd);
00e2e675
DG
609
610 /* Reset data header */
611 memset(&data_hdr, 0, sizeof(data_hdr));
612
00e2e675
DG
613 if (stream->metadata_flag) {
614 /* Caller MUST acquire the relayd control socket lock */
615 ret = relayd_send_metadata(&relayd->control_sock, data_size);
616 if (ret < 0) {
617 goto error;
618 }
619
620 /* Metadata are always sent on the control socket. */
621 outfd = relayd->control_sock.fd;
622 } else {
623 /* Set header with stream information */
624 data_hdr.stream_id = htobe64(stream->relayd_stream_id);
625 data_hdr.data_size = htobe32(data_size);
1d4dfdef 626 data_hdr.padding_size = htobe32(padding);
173af62f 627 data_hdr.net_seq_num = htobe64(stream->next_net_seq_num++);
00e2e675
DG
628 /* Other fields are zeroed previously */
629
630 ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr,
631 sizeof(data_hdr));
632 if (ret < 0) {
633 goto error;
634 }
635
636 /* Set to go on data socket */
637 outfd = relayd->data_sock.fd;
638 }
639
640error:
641 return outfd;
642}
643
702b1ea4
MD
644static
645void consumer_free_channel(struct rcu_head *head)
646{
647 struct lttng_ht_node_ulong *node =
648 caa_container_of(head, struct lttng_ht_node_ulong, head);
649 struct lttng_consumer_channel *channel =
650 caa_container_of(node, struct lttng_consumer_channel, node);
651
652 free(channel);
653}
654
3bd1e081
MD
655/*
656 * Remove a channel from the global list protected by a mutex. This
657 * function is also responsible for freeing its data structures.
658 */
659void consumer_del_channel(struct lttng_consumer_channel *channel)
660{
661 int ret;
e4421fec 662 struct lttng_ht_iter iter;
3bd1e081
MD
663
664 pthread_mutex_lock(&consumer_data.lock);
665
666 switch (consumer_data.type) {
667 case LTTNG_CONSUMER_KERNEL:
668 break;
7753dea8
MD
669 case LTTNG_CONSUMER32_UST:
670 case LTTNG_CONSUMER64_UST:
3bd1e081
MD
671 lttng_ustconsumer_del_channel(channel);
672 break;
673 default:
674 ERR("Unknown consumer_data type");
675 assert(0);
676 goto end;
677 }
678
6065ceec 679 rcu_read_lock();
04253271
MD
680 iter.iter.node = &channel->node.node;
681 ret = lttng_ht_del(consumer_data.channel_ht, &iter);
682 assert(!ret);
6065ceec
DG
683 rcu_read_unlock();
684
3bd1e081
MD
685 if (channel->mmap_base != NULL) {
686 ret = munmap(channel->mmap_base, channel->mmap_len);
687 if (ret != 0) {
7a57cf92 688 PERROR("munmap");
3bd1e081
MD
689 }
690 }
b5c5fc29 691 if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) {
4c462e79
MD
692 ret = close(channel->wait_fd);
693 if (ret) {
694 PERROR("close");
695 }
3bd1e081 696 }
2c1dd183 697 if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) {
4c462e79
MD
698 ret = close(channel->shm_fd);
699 if (ret) {
700 PERROR("close");
701 }
3bd1e081 702 }
702b1ea4
MD
703
704 call_rcu(&channel->node.head, consumer_free_channel);
3bd1e081
MD
705end:
706 pthread_mutex_unlock(&consumer_data.lock);
707}
708
709struct lttng_consumer_channel *consumer_allocate_channel(
710 int channel_key,
711 int shm_fd, int wait_fd,
712 uint64_t mmap_len,
c30aaa51
MD
713 uint64_t max_sb_size,
714 unsigned int nb_init_streams)
3bd1e081
MD
715{
716 struct lttng_consumer_channel *channel;
717 int ret;
718
276b26d1 719 channel = zmalloc(sizeof(*channel));
3bd1e081 720 if (channel == NULL) {
7a57cf92 721 PERROR("malloc struct lttng_consumer_channel");
3bd1e081
MD
722 goto end;
723 }
724 channel->key = channel_key;
725 channel->shm_fd = shm_fd;
726 channel->wait_fd = wait_fd;
727 channel->mmap_len = mmap_len;
728 channel->max_sb_size = max_sb_size;
729 channel->refcount = 0;
c30aaa51 730 channel->nb_init_streams = nb_init_streams;
e4421fec 731 lttng_ht_node_init_ulong(&channel->node, channel->key);
3bd1e081
MD
732
733 switch (consumer_data.type) {
734 case LTTNG_CONSUMER_KERNEL:
735 channel->mmap_base = NULL;
736 channel->mmap_len = 0;
737 break;
7753dea8
MD
738 case LTTNG_CONSUMER32_UST:
739 case LTTNG_CONSUMER64_UST:
3bd1e081
MD
740 ret = lttng_ustconsumer_allocate_channel(channel);
741 if (ret) {
742 free(channel);
743 return NULL;
744 }
745 break;
746 default:
747 ERR("Unknown consumer_data type");
748 assert(0);
749 goto end;
750 }
751 DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)",
00e2e675 752 channel->key, channel->shm_fd, channel->wait_fd,
3bd1e081
MD
753 (unsigned long long) channel->mmap_len,
754 (unsigned long long) channel->max_sb_size);
755end:
756 return channel;
757}
758
759/*
760 * Add a channel to the global list protected by a mutex.
761 */
762int consumer_add_channel(struct lttng_consumer_channel *channel)
763{
c77fc10a
DG
764 struct lttng_ht_node_ulong *node;
765 struct lttng_ht_iter iter;
766
3bd1e081 767 pthread_mutex_lock(&consumer_data.lock);
7ad0a0cb
MD
768 /* Steal channel identifier, for UST */
769 consumer_steal_channel_key(channel->key);
6065ceec 770 rcu_read_lock();
c77fc10a
DG
771
772 lttng_ht_lookup(consumer_data.channel_ht,
773 (void *)((unsigned long) channel->key), &iter);
774 node = lttng_ht_iter_get_node_ulong(&iter);
775 if (node != NULL) {
776 /* Channel already exist. Ignore the insertion */
777 goto end;
778 }
779
04253271 780 lttng_ht_add_unique_ulong(consumer_data.channel_ht, &channel->node);
c77fc10a
DG
781
782end:
6065ceec 783 rcu_read_unlock();
3bd1e081 784 pthread_mutex_unlock(&consumer_data.lock);
702b1ea4 785
7ad0a0cb 786 return 0;
3bd1e081
MD
787}
788
789/*
790 * Allocate the pollfd structure and the local view of the out fds to avoid
791 * doing a lookup in the linked list and concurrency issues when writing is
792 * needed. Called with consumer_data.lock held.
793 *
794 * Returns the number of fds in the structures.
795 */
43c34bc3 796static int consumer_update_poll_array(
3bd1e081 797 struct lttng_consumer_local_data *ctx, struct pollfd **pollfd,
43c34bc3 798 struct lttng_consumer_stream **local_stream, struct lttng_ht *ht)
3bd1e081 799{
3bd1e081 800 int i = 0;
e4421fec
DG
801 struct lttng_ht_iter iter;
802 struct lttng_consumer_stream *stream;
3bd1e081
MD
803
804 DBG("Updating poll fd array");
481d6c57 805 rcu_read_lock();
43c34bc3 806 cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) {
e4421fec 807 if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM) {
3bd1e081
MD
808 continue;
809 }
e4421fec
DG
810 DBG("Active FD %d", stream->wait_fd);
811 (*pollfd)[i].fd = stream->wait_fd;
3bd1e081 812 (*pollfd)[i].events = POLLIN | POLLPRI;
e4421fec 813 local_stream[i] = stream;
3bd1e081
MD
814 i++;
815 }
481d6c57 816 rcu_read_unlock();
3bd1e081
MD
817
818 /*
50f8ae69 819 * Insert the consumer_data_pipe at the end of the array and don't
3bd1e081
MD
820 * increment i so nb_fd is the number of real FD.
821 */
50f8ae69 822 (*pollfd)[i].fd = ctx->consumer_data_pipe[0];
509bb1cf 823 (*pollfd)[i].events = POLLIN | POLLPRI;
3bd1e081
MD
824 return i;
825}
826
827/*
828 * Poll on the should_quit pipe and the command socket return -1 on error and
829 * should exit, 0 if data is available on the command socket
830 */
831int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll)
832{
833 int num_rdy;
834
88f2b785 835restart:
3bd1e081
MD
836 num_rdy = poll(consumer_sockpoll, 2, -1);
837 if (num_rdy == -1) {
88f2b785
MD
838 /*
839 * Restart interrupted system call.
840 */
841 if (errno == EINTR) {
842 goto restart;
843 }
7a57cf92 844 PERROR("Poll error");
3bd1e081
MD
845 goto exit;
846 }
509bb1cf 847 if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) {
3bd1e081
MD
848 DBG("consumer_should_quit wake up");
849 goto exit;
850 }
851 return 0;
852
853exit:
854 return -1;
855}
856
857/*
858 * Set the error socket.
859 */
860void lttng_consumer_set_error_sock(
861 struct lttng_consumer_local_data *ctx, int sock)
862{
863 ctx->consumer_error_socket = sock;
864}
865
866/*
867 * Set the command socket path.
868 */
3bd1e081
MD
869void lttng_consumer_set_command_sock_path(
870 struct lttng_consumer_local_data *ctx, char *sock)
871{
872 ctx->consumer_command_sock_path = sock;
873}
874
875/*
876 * Send return code to the session daemon.
877 * If the socket is not defined, we return 0, it is not a fatal error
878 */
879int lttng_consumer_send_error(
880 struct lttng_consumer_local_data *ctx, int cmd)
881{
882 if (ctx->consumer_error_socket > 0) {
883 return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd,
884 sizeof(enum lttcomm_sessiond_command));
885 }
886
887 return 0;
888}
889
890/*
891 * Close all the tracefiles and stream fds, should be called when all instances
892 * are destroyed.
893 */
894void lttng_consumer_cleanup(void)
895{
e4421fec 896 struct lttng_ht_iter iter;
6065ceec
DG
897 struct lttng_ht_node_ulong *node;
898
899 rcu_read_lock();
3bd1e081 900
6065ceec
DG
901 cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node,
902 node) {
702b1ea4
MD
903 struct lttng_consumer_channel *channel =
904 caa_container_of(node, struct lttng_consumer_channel, node);
905 consumer_del_channel(channel);
3bd1e081 906 }
6065ceec
DG
907
908 rcu_read_unlock();
d6ce1df2 909
d6ce1df2 910 lttng_ht_destroy(consumer_data.channel_ht);
3bd1e081
MD
911}
912
913/*
914 * Called from signal handler.
915 */
916void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx)
917{
918 int ret;
919 consumer_quit = 1;
6f94560a
MD
920 do {
921 ret = write(ctx->consumer_should_quit[1], "4", 1);
922 } while (ret < 0 && errno == EINTR);
3bd1e081 923 if (ret < 0) {
7a57cf92 924 PERROR("write consumer quit");
3bd1e081 925 }
ab1027f4
DG
926
927 DBG("Consumer flag that it should quit");
3bd1e081
MD
928}
929
00e2e675
DG
930void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream,
931 off_t orig_offset)
3bd1e081
MD
932{
933 int outfd = stream->out_fd;
934
935 /*
936 * This does a blocking write-and-wait on any page that belongs to the
937 * subbuffer prior to the one we just wrote.
938 * Don't care about error values, as these are just hints and ways to
939 * limit the amount of page cache used.
940 */
941 if (orig_offset < stream->chan->max_sb_size) {
942 return;
943 }
b9182dd9 944 lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size,
3bd1e081
MD
945 stream->chan->max_sb_size,
946 SYNC_FILE_RANGE_WAIT_BEFORE
947 | SYNC_FILE_RANGE_WRITE
948 | SYNC_FILE_RANGE_WAIT_AFTER);
949 /*
950 * Give hints to the kernel about how we access the file:
951 * POSIX_FADV_DONTNEED : we won't re-access data in a near future after
952 * we write it.
953 *
954 * We need to call fadvise again after the file grows because the
955 * kernel does not seem to apply fadvise to non-existing parts of the
956 * file.
957 *
958 * Call fadvise _after_ having waited for the page writeback to
959 * complete because the dirty page writeback semantic is not well
960 * defined. So it can be expected to lead to lower throughput in
961 * streaming.
962 */
963 posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size,
964 stream->chan->max_sb_size, POSIX_FADV_DONTNEED);
965}
966
967/*
968 * Initialise the necessary environnement :
969 * - create a new context
970 * - create the poll_pipe
971 * - create the should_quit pipe (for signal handler)
972 * - create the thread pipe (for splice)
973 *
974 * Takes a function pointer as argument, this function is called when data is
975 * available on a buffer. This function is responsible to do the
976 * kernctl_get_next_subbuf, read the data with mmap or splice depending on the
977 * buffer configuration and then kernctl_put_next_subbuf at the end.
978 *
979 * Returns a pointer to the new context or NULL on error.
980 */
981struct lttng_consumer_local_data *lttng_consumer_create(
982 enum lttng_consumer_type type,
4078b776 983 ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream,
d41f73b7 984 struct lttng_consumer_local_data *ctx),
3bd1e081
MD
985 int (*recv_channel)(struct lttng_consumer_channel *channel),
986 int (*recv_stream)(struct lttng_consumer_stream *stream),
987 int (*update_stream)(int stream_key, uint32_t state))
988{
989 int ret, i;
990 struct lttng_consumer_local_data *ctx;
991
992 assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN ||
993 consumer_data.type == type);
994 consumer_data.type = type;
995
effcf122 996 ctx = zmalloc(sizeof(struct lttng_consumer_local_data));
3bd1e081 997 if (ctx == NULL) {
7a57cf92 998 PERROR("allocating context");
3bd1e081
MD
999 goto error;
1000 }
1001
1002 ctx->consumer_error_socket = -1;
1003 /* assign the callbacks */
1004 ctx->on_buffer_ready = buffer_ready;
1005 ctx->on_recv_channel = recv_channel;
1006 ctx->on_recv_stream = recv_stream;
1007 ctx->on_update_stream = update_stream;
1008
50f8ae69 1009 ret = pipe(ctx->consumer_data_pipe);
3bd1e081 1010 if (ret < 0) {
7a57cf92 1011 PERROR("Error creating poll pipe");
3bd1e081
MD
1012 goto error_poll_pipe;
1013 }
1014
04fdd819 1015 /* set read end of the pipe to non-blocking */
50f8ae69 1016 ret = fcntl(ctx->consumer_data_pipe[0], F_SETFL, O_NONBLOCK);
04fdd819 1017 if (ret < 0) {
7a57cf92 1018 PERROR("fcntl O_NONBLOCK");
04fdd819
MD
1019 goto error_poll_fcntl;
1020 }
1021
1022 /* set write end of the pipe to non-blocking */
50f8ae69 1023 ret = fcntl(ctx->consumer_data_pipe[1], F_SETFL, O_NONBLOCK);
04fdd819 1024 if (ret < 0) {
7a57cf92 1025 PERROR("fcntl O_NONBLOCK");
04fdd819
MD
1026 goto error_poll_fcntl;
1027 }
1028
3bd1e081
MD
1029 ret = pipe(ctx->consumer_should_quit);
1030 if (ret < 0) {
7a57cf92 1031 PERROR("Error creating recv pipe");
3bd1e081
MD
1032 goto error_quit_pipe;
1033 }
1034
1035 ret = pipe(ctx->consumer_thread_pipe);
1036 if (ret < 0) {
7a57cf92 1037 PERROR("Error creating thread pipe");
3bd1e081
MD
1038 goto error_thread_pipe;
1039 }
1040
fb3a43a9
DG
1041 ret = utils_create_pipe(ctx->consumer_metadata_pipe);
1042 if (ret < 0) {
1043 goto error_metadata_pipe;
1044 }
3bd1e081 1045
fb3a43a9
DG
1046 ret = utils_create_pipe(ctx->consumer_splice_metadata_pipe);
1047 if (ret < 0) {
1048 goto error_splice_pipe;
1049 }
1050
1051 return ctx;
3bd1e081 1052
fb3a43a9
DG
1053error_splice_pipe:
1054 utils_close_pipe(ctx->consumer_metadata_pipe);
1055error_metadata_pipe:
1056 utils_close_pipe(ctx->consumer_thread_pipe);
3bd1e081
MD
1057error_thread_pipe:
1058 for (i = 0; i < 2; i++) {
1059 int err;
1060
1061 err = close(ctx->consumer_should_quit[i]);
4c462e79
MD
1062 if (err) {
1063 PERROR("close");
1064 }
3bd1e081 1065 }
04fdd819 1066error_poll_fcntl:
3bd1e081
MD
1067error_quit_pipe:
1068 for (i = 0; i < 2; i++) {
1069 int err;
1070
50f8ae69 1071 err = close(ctx->consumer_data_pipe[i]);
4c462e79
MD
1072 if (err) {
1073 PERROR("close");
1074 }
3bd1e081
MD
1075 }
1076error_poll_pipe:
1077 free(ctx);
1078error:
1079 return NULL;
1080}
1081
1082/*
1083 * Close all fds associated with the instance and free the context.
1084 */
1085void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx)
1086{
4c462e79
MD
1087 int ret;
1088
ab1027f4
DG
1089 DBG("Consumer destroying it. Closing everything.");
1090
4c462e79
MD
1091 ret = close(ctx->consumer_error_socket);
1092 if (ret) {
1093 PERROR("close");
1094 }
1095 ret = close(ctx->consumer_thread_pipe[0]);
1096 if (ret) {
1097 PERROR("close");
1098 }
1099 ret = close(ctx->consumer_thread_pipe[1]);
1100 if (ret) {
1101 PERROR("close");
1102 }
50f8ae69 1103 ret = close(ctx->consumer_data_pipe[0]);
4c462e79
MD
1104 if (ret) {
1105 PERROR("close");
1106 }
50f8ae69 1107 ret = close(ctx->consumer_data_pipe[1]);
4c462e79
MD
1108 if (ret) {
1109 PERROR("close");
1110 }
1111 ret = close(ctx->consumer_should_quit[0]);
1112 if (ret) {
1113 PERROR("close");
1114 }
1115 ret = close(ctx->consumer_should_quit[1]);
1116 if (ret) {
1117 PERROR("close");
1118 }
fb3a43a9
DG
1119 utils_close_pipe(ctx->consumer_splice_metadata_pipe);
1120
3bd1e081
MD
1121 unlink(ctx->consumer_command_sock_path);
1122 free(ctx);
1123}
1124
6197aea7
DG
1125/*
1126 * Write the metadata stream id on the specified file descriptor.
1127 */
1128static int write_relayd_metadata_id(int fd,
1129 struct lttng_consumer_stream *stream,
1d4dfdef
DG
1130 struct consumer_relayd_sock_pair *relayd,
1131 unsigned long padding)
6197aea7
DG
1132{
1133 int ret;
1d4dfdef 1134 struct lttcomm_relayd_metadata_payload hdr;
6197aea7 1135
1d4dfdef
DG
1136 hdr.stream_id = htobe64(stream->relayd_stream_id);
1137 hdr.padding_size = htobe32(padding);
6197aea7 1138 do {
1d4dfdef 1139 ret = write(fd, (void *) &hdr, sizeof(hdr));
6197aea7
DG
1140 } while (ret < 0 && errno == EINTR);
1141 if (ret < 0) {
1142 PERROR("write metadata stream id");
1143 goto end;
1144 }
1d4dfdef
DG
1145 DBG("Metadata stream id %" PRIu64 " with padding %lu written before data",
1146 stream->relayd_stream_id, padding);
6197aea7
DG
1147
1148end:
1149 return ret;
1150}
1151
3bd1e081 1152/*
09e26845
DG
1153 * Mmap the ring buffer, read it and write the data to the tracefile. This is a
1154 * core function for writing trace buffers to either the local filesystem or
1155 * the network.
1156 *
1157 * Careful review MUST be put if any changes occur!
3bd1e081
MD
1158 *
1159 * Returns the number of bytes written
1160 */
4078b776 1161ssize_t lttng_consumer_on_read_subbuffer_mmap(
3bd1e081 1162 struct lttng_consumer_local_data *ctx,
1d4dfdef
DG
1163 struct lttng_consumer_stream *stream, unsigned long len,
1164 unsigned long padding)
3bd1e081 1165{
f02e1e8a
DG
1166 unsigned long mmap_offset;
1167 ssize_t ret = 0, written = 0;
1168 off_t orig_offset = stream->out_fd_offset;
1169 /* Default is on the disk */
1170 int outfd = stream->out_fd;
f02e1e8a
DG
1171 struct consumer_relayd_sock_pair *relayd = NULL;
1172
1173 /* RCU lock for the relayd pointer */
1174 rcu_read_lock();
1175
c8f59ee5
DG
1176 pthread_mutex_lock(&stream->lock);
1177
f02e1e8a
DG
1178 /* Flag that the current stream if set for network streaming. */
1179 if (stream->net_seq_idx != -1) {
1180 relayd = consumer_find_relayd(stream->net_seq_idx);
1181 if (relayd == NULL) {
1182 goto end;
1183 }
1184 }
1185
1186 /* get the offset inside the fd to mmap */
3bd1e081
MD
1187 switch (consumer_data.type) {
1188 case LTTNG_CONSUMER_KERNEL:
f02e1e8a
DG
1189 ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset);
1190 break;
7753dea8
MD
1191 case LTTNG_CONSUMER32_UST:
1192 case LTTNG_CONSUMER64_UST:
f02e1e8a
DG
1193 ret = lttng_ustctl_get_mmap_read_offset(stream->chan->handle,
1194 stream->buf, &mmap_offset);
1195 break;
3bd1e081
MD
1196 default:
1197 ERR("Unknown consumer_data type");
1198 assert(0);
1199 }
f02e1e8a
DG
1200 if (ret != 0) {
1201 errno = -ret;
1202 PERROR("tracer ctl get_mmap_read_offset");
1203 written = ret;
1204 goto end;
1205 }
b9182dd9 1206
f02e1e8a
DG
1207 /* Handle stream on the relayd if the output is on the network */
1208 if (relayd) {
1209 unsigned long netlen = len;
1210
1211 /*
1212 * Lock the control socket for the complete duration of the function
1213 * since from this point on we will use the socket.
1214 */
1215 if (stream->metadata_flag) {
1216 /* Metadata requires the control socket. */
1217 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
1d4dfdef 1218 netlen += sizeof(struct lttcomm_relayd_metadata_payload);
f02e1e8a
DG
1219 }
1220
1d4dfdef 1221 ret = write_relayd_stream_header(stream, netlen, padding, relayd);
f02e1e8a
DG
1222 if (ret >= 0) {
1223 /* Use the returned socket. */
1224 outfd = ret;
1225
1226 /* Write metadata stream id before payload */
1227 if (stream->metadata_flag) {
1d4dfdef 1228 ret = write_relayd_metadata_id(outfd, stream, relayd, padding);
f02e1e8a 1229 if (ret < 0) {
f02e1e8a
DG
1230 written = ret;
1231 goto end;
1232 }
f02e1e8a
DG
1233 }
1234 }
1235 /* Else, use the default set before which is the filesystem. */
1d4dfdef
DG
1236 } else {
1237 /* No streaming, we have to set the len with the full padding */
1238 len += padding;
f02e1e8a
DG
1239 }
1240
1241 while (len > 0) {
1242 do {
1243 ret = write(outfd, stream->mmap_base + mmap_offset, len);
1244 } while (ret < 0 && errno == EINTR);
1d4dfdef 1245 DBG("Consumer mmap write() ret %zd (len %lu)", ret, len);
f02e1e8a
DG
1246 if (ret < 0) {
1247 PERROR("Error in file write");
1248 if (written == 0) {
1249 written = ret;
1250 }
1251 goto end;
1252 } else if (ret > len) {
77c7c900 1253 PERROR("Error in file write (ret %zd > len %lu)", ret, len);
f02e1e8a
DG
1254 written += ret;
1255 goto end;
1256 } else {
1257 len -= ret;
1258 mmap_offset += ret;
1259 }
f02e1e8a
DG
1260
1261 /* This call is useless on a socket so better save a syscall. */
1262 if (!relayd) {
1263 /* This won't block, but will start writeout asynchronously */
1264 lttng_sync_file_range(outfd, stream->out_fd_offset, ret,
1265 SYNC_FILE_RANGE_WRITE);
1266 stream->out_fd_offset += ret;
1267 }
1268 written += ret;
1269 }
1270 lttng_consumer_sync_trace_file(stream, orig_offset);
1271
1272end:
1273 /* Unlock only if ctrl socket used */
1274 if (relayd && stream->metadata_flag) {
1275 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
1276 }
6f6eda74 1277 pthread_mutex_unlock(&stream->lock);
f02e1e8a
DG
1278
1279 rcu_read_unlock();
1280 return written;
3bd1e081
MD
1281}
1282
1283/*
1284 * Splice the data from the ring buffer to the tracefile.
1285 *
1286 * Returns the number of bytes spliced.
1287 */
4078b776 1288ssize_t lttng_consumer_on_read_subbuffer_splice(
3bd1e081 1289 struct lttng_consumer_local_data *ctx,
1d4dfdef
DG
1290 struct lttng_consumer_stream *stream, unsigned long len,
1291 unsigned long padding)
3bd1e081 1292{
f02e1e8a
DG
1293 ssize_t ret = 0, written = 0, ret_splice = 0;
1294 loff_t offset = 0;
1295 off_t orig_offset = stream->out_fd_offset;
1296 int fd = stream->wait_fd;
1297 /* Default is on the disk */
1298 int outfd = stream->out_fd;
f02e1e8a 1299 struct consumer_relayd_sock_pair *relayd = NULL;
fb3a43a9 1300 int *splice_pipe;
f02e1e8a 1301
3bd1e081
MD
1302 switch (consumer_data.type) {
1303 case LTTNG_CONSUMER_KERNEL:
f02e1e8a 1304 break;
7753dea8
MD
1305 case LTTNG_CONSUMER32_UST:
1306 case LTTNG_CONSUMER64_UST:
f02e1e8a 1307 /* Not supported for user space tracing */
3bd1e081
MD
1308 return -ENOSYS;
1309 default:
1310 ERR("Unknown consumer_data type");
1311 assert(0);
3bd1e081
MD
1312 }
1313
f02e1e8a
DG
1314 /* RCU lock for the relayd pointer */
1315 rcu_read_lock();
1316
c8f59ee5
DG
1317 pthread_mutex_lock(&stream->lock);
1318
f02e1e8a
DG
1319 /* Flag that the current stream if set for network streaming. */
1320 if (stream->net_seq_idx != -1) {
1321 relayd = consumer_find_relayd(stream->net_seq_idx);
1322 if (relayd == NULL) {
1323 goto end;
1324 }
1325 }
1326
fb3a43a9
DG
1327 /*
1328 * Choose right pipe for splice. Metadata and trace data are handled by
1329 * different threads hence the use of two pipes in order not to race or
1330 * corrupt the written data.
1331 */
1332 if (stream->metadata_flag) {
1333 splice_pipe = ctx->consumer_splice_metadata_pipe;
1334 } else {
1335 splice_pipe = ctx->consumer_thread_pipe;
1336 }
1337
f02e1e8a 1338 /* Write metadata stream id before payload */
1d4dfdef
DG
1339 if (relayd) {
1340 int total_len = len;
f02e1e8a 1341
1d4dfdef
DG
1342 if (stream->metadata_flag) {
1343 /*
1344 * Lock the control socket for the complete duration of the function
1345 * since from this point on we will use the socket.
1346 */
1347 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
1348
1349 ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd,
1350 padding);
1351 if (ret < 0) {
1352 written = ret;
1353 goto end;
1354 }
1355
1356 total_len += sizeof(struct lttcomm_relayd_metadata_payload);
1357 }
1358
1359 ret = write_relayd_stream_header(stream, total_len, padding, relayd);
1360 if (ret >= 0) {
1361 /* Use the returned socket. */
1362 outfd = ret;
1363 } else {
1364 ERR("Remote relayd disconnected. Stopping");
f02e1e8a
DG
1365 goto end;
1366 }
1d4dfdef
DG
1367 } else {
1368 /* No streaming, we have to set the len with the full padding */
1369 len += padding;
f02e1e8a
DG
1370 }
1371
1372 while (len > 0) {
1d4dfdef
DG
1373 DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)",
1374 (unsigned long)offset, len, fd, splice_pipe[1]);
fb3a43a9 1375 ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len,
f02e1e8a
DG
1376 SPLICE_F_MOVE | SPLICE_F_MORE);
1377 DBG("splice chan to pipe, ret %zd", ret_splice);
1378 if (ret_splice < 0) {
1379 PERROR("Error in relay splice");
1380 if (written == 0) {
1381 written = ret_splice;
1382 }
1383 ret = errno;
1384 goto splice_error;
1385 }
1386
1387 /* Handle stream on the relayd if the output is on the network */
1388 if (relayd) {
1389 if (stream->metadata_flag) {
1d4dfdef
DG
1390 size_t metadata_payload_size =
1391 sizeof(struct lttcomm_relayd_metadata_payload);
1392
f02e1e8a 1393 /* Update counter to fit the spliced data */
1d4dfdef
DG
1394 ret_splice += metadata_payload_size;
1395 len += metadata_payload_size;
f02e1e8a
DG
1396 /*
1397 * We do this so the return value can match the len passed as
1398 * argument to this function.
1399 */
1d4dfdef 1400 written -= metadata_payload_size;
f02e1e8a
DG
1401 }
1402 }
1403
1404 /* Splice data out */
fb3a43a9 1405 ret_splice = splice(splice_pipe[0], NULL, outfd, NULL,
f02e1e8a 1406 ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE);
1d4dfdef 1407 DBG("Consumer splice pipe to file, ret %zd", ret_splice);
f02e1e8a
DG
1408 if (ret_splice < 0) {
1409 PERROR("Error in file splice");
1410 if (written == 0) {
1411 written = ret_splice;
1412 }
1413 ret = errno;
1414 goto splice_error;
1415 } else if (ret_splice > len) {
1416 errno = EINVAL;
1417 PERROR("Wrote more data than requested %zd (len: %lu)",
1418 ret_splice, len);
1419 written += ret_splice;
1420 ret = errno;
1421 goto splice_error;
1422 }
1423 len -= ret_splice;
1424
1425 /* This call is useless on a socket so better save a syscall. */
1426 if (!relayd) {
1427 /* This won't block, but will start writeout asynchronously */
1428 lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice,
1429 SYNC_FILE_RANGE_WRITE);
1430 stream->out_fd_offset += ret_splice;
1431 }
1432 written += ret_splice;
1433 }
1434 lttng_consumer_sync_trace_file(stream, orig_offset);
1435
1436 ret = ret_splice;
1437
1438 goto end;
1439
1440splice_error:
1441 /* send the appropriate error description to sessiond */
1442 switch (ret) {
1443 case EBADF:
f73fabfd 1444 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EBADF);
f02e1e8a
DG
1445 break;
1446 case EINVAL:
f73fabfd 1447 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL);
f02e1e8a
DG
1448 break;
1449 case ENOMEM:
f73fabfd 1450 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM);
f02e1e8a
DG
1451 break;
1452 case ESPIPE:
f73fabfd 1453 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE);
f02e1e8a
DG
1454 break;
1455 }
1456
1457end:
1458 if (relayd && stream->metadata_flag) {
1459 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
1460 }
6f6eda74 1461 pthread_mutex_unlock(&stream->lock);
f02e1e8a
DG
1462
1463 rcu_read_unlock();
1464 return written;
3bd1e081
MD
1465}
1466
1467/*
1468 * Take a snapshot for a specific fd
1469 *
1470 * Returns 0 on success, < 0 on error
1471 */
1472int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx,
1473 struct lttng_consumer_stream *stream)
1474{
1475 switch (consumer_data.type) {
1476 case LTTNG_CONSUMER_KERNEL:
1477 return lttng_kconsumer_take_snapshot(ctx, stream);
7753dea8
MD
1478 case LTTNG_CONSUMER32_UST:
1479 case LTTNG_CONSUMER64_UST:
3bd1e081
MD
1480 return lttng_ustconsumer_take_snapshot(ctx, stream);
1481 default:
1482 ERR("Unknown consumer_data type");
1483 assert(0);
1484 return -ENOSYS;
1485 }
1486
1487}
1488
1489/*
1490 * Get the produced position
1491 *
1492 * Returns 0 on success, < 0 on error
1493 */
1494int lttng_consumer_get_produced_snapshot(
1495 struct lttng_consumer_local_data *ctx,
1496 struct lttng_consumer_stream *stream,
1497 unsigned long *pos)
1498{
1499 switch (consumer_data.type) {
1500 case LTTNG_CONSUMER_KERNEL:
1501 return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos);
7753dea8
MD
1502 case LTTNG_CONSUMER32_UST:
1503 case LTTNG_CONSUMER64_UST:
3bd1e081
MD
1504 return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos);
1505 default:
1506 ERR("Unknown consumer_data type");
1507 assert(0);
1508 return -ENOSYS;
1509 }
1510}
1511
1512int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx,
1513 int sock, struct pollfd *consumer_sockpoll)
1514{
1515 switch (consumer_data.type) {
1516 case LTTNG_CONSUMER_KERNEL:
1517 return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll);
7753dea8
MD
1518 case LTTNG_CONSUMER32_UST:
1519 case LTTNG_CONSUMER64_UST:
3bd1e081
MD
1520 return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll);
1521 default:
1522 ERR("Unknown consumer_data type");
1523 assert(0);
1524 return -ENOSYS;
1525 }
1526}
1527
43c34bc3
DG
1528/*
1529 * Iterate over all streams of the hashtable and free them properly.
1530 *
1531 * WARNING: *MUST* be used with data stream only.
1532 */
1533static void destroy_data_stream_ht(struct lttng_ht *ht)
1534{
1535 int ret;
1536 struct lttng_ht_iter iter;
1537 struct lttng_consumer_stream *stream;
1538
1539 if (ht == NULL) {
1540 return;
1541 }
1542
1543 rcu_read_lock();
1544 cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) {
1545 ret = lttng_ht_del(ht, &iter);
1546 assert(!ret);
1547
1548 call_rcu(&stream->node.head, consumer_free_stream);
1549 }
1550 rcu_read_unlock();
1551
1552 lttng_ht_destroy(ht);
1553}
1554
fb3a43a9 1555/*
f724d81e 1556 * Iterate over all streams of the hashtable and free them properly.
e316aad5
DG
1557 *
1558 * XXX: Should not be only for metadata stream or else use an other name.
fb3a43a9
DG
1559 */
1560static void destroy_stream_ht(struct lttng_ht *ht)
1561{
1562 int ret;
1563 struct lttng_ht_iter iter;
1564 struct lttng_consumer_stream *stream;
1565
1566 if (ht == NULL) {
1567 return;
1568 }
1569
d09e1200 1570 rcu_read_lock();
58b1f425 1571 cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) {
fb3a43a9
DG
1572 ret = lttng_ht_del(ht, &iter);
1573 assert(!ret);
1574
58b1f425 1575 call_rcu(&stream->node.head, consumer_free_stream);
fb3a43a9 1576 }
d09e1200 1577 rcu_read_unlock();
fb3a43a9
DG
1578
1579 lttng_ht_destroy(ht);
1580}
1581
1582/*
1583 * Clean up a metadata stream and free its memory.
1584 */
e316aad5
DG
1585void consumer_del_metadata_stream(struct lttng_consumer_stream *stream,
1586 struct lttng_ht *ht)
fb3a43a9
DG
1587{
1588 int ret;
e316aad5
DG
1589 struct lttng_ht_iter iter;
1590 struct lttng_consumer_channel *free_chan = NULL;
fb3a43a9
DG
1591 struct consumer_relayd_sock_pair *relayd;
1592
1593 assert(stream);
1594 /*
1595 * This call should NEVER receive regular stream. It must always be
1596 * metadata stream and this is crucial for data structure synchronization.
1597 */
1598 assert(stream->metadata_flag);
1599
e316aad5
DG
1600 DBG3("Consumer delete metadata stream %d", stream->wait_fd);
1601
1602 if (ht == NULL) {
1603 /* Means the stream was allocated but not successfully added */
1604 goto free_stream;
1605 }
1606
fb3a43a9
DG
1607 pthread_mutex_lock(&consumer_data.lock);
1608 switch (consumer_data.type) {
1609 case LTTNG_CONSUMER_KERNEL:
1610 if (stream->mmap_base != NULL) {
1611 ret = munmap(stream->mmap_base, stream->mmap_len);
1612 if (ret != 0) {
1613 PERROR("munmap metadata stream");
1614 }
1615 }
1616 break;
1617 case LTTNG_CONSUMER32_UST:
1618 case LTTNG_CONSUMER64_UST:
1619 lttng_ustconsumer_del_stream(stream);
1620 break;
1621 default:
1622 ERR("Unknown consumer_data type");
1623 assert(0);
e316aad5 1624 goto end;
fb3a43a9 1625 }
fb3a43a9 1626
c869f647 1627 rcu_read_lock();
58b1f425 1628 iter.iter.node = &stream->node.node;
c869f647
DG
1629 ret = lttng_ht_del(ht, &iter);
1630 assert(!ret);
ca22feea
DG
1631
1632 /* Remove node session id from the consumer_data stream ht */
1633 iter.iter.node = &stream->node_session_id.node;
1634 ret = lttng_ht_del(consumer_data.stream_list_ht, &iter);
1635 assert(!ret);
c869f647
DG
1636 rcu_read_unlock();
1637
fb3a43a9
DG
1638 if (stream->out_fd >= 0) {
1639 ret = close(stream->out_fd);
1640 if (ret) {
1641 PERROR("close");
1642 }
1643 }
1644
1645 if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) {
1646 ret = close(stream->wait_fd);
1647 if (ret) {
1648 PERROR("close");
1649 }
1650 }
1651
1652 if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) {
1653 ret = close(stream->shm_fd);
1654 if (ret) {
1655 PERROR("close");
1656 }
1657 }
1658
1659 /* Check and cleanup relayd */
1660 rcu_read_lock();
1661 relayd = consumer_find_relayd(stream->net_seq_idx);
1662 if (relayd != NULL) {
1663 uatomic_dec(&relayd->refcount);
1664 assert(uatomic_read(&relayd->refcount) >= 0);
1665
1666 /* Closing streams requires to lock the control socket. */
1667 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
1668 ret = relayd_send_close_stream(&relayd->control_sock,
1669 stream->relayd_stream_id, stream->next_net_seq_num - 1);
1670 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
1671 if (ret < 0) {
1672 DBG("Unable to close stream on the relayd. Continuing");
1673 /*
1674 * Continue here. There is nothing we can do for the relayd.
1675 * Chances are that the relayd has closed the socket so we just
1676 * continue cleaning up.
1677 */
1678 }
1679
1680 /* Both conditions are met, we destroy the relayd. */
1681 if (uatomic_read(&relayd->refcount) == 0 &&
1682 uatomic_read(&relayd->destroy_flag)) {
d09e1200 1683 destroy_relayd(relayd);
fb3a43a9
DG
1684 }
1685 }
1686 rcu_read_unlock();
1687
1688 /* Atomically decrement channel refcount since other threads can use it. */
1689 uatomic_dec(&stream->chan->refcount);
c30aaa51
MD
1690 if (!uatomic_read(&stream->chan->refcount)
1691 && !uatomic_read(&stream->chan->nb_init_streams)) {
1692 /* Go for channel deletion! */
e316aad5 1693 free_chan = stream->chan;
fb3a43a9
DG
1694 }
1695
e316aad5
DG
1696end:
1697 pthread_mutex_unlock(&consumer_data.lock);
1698
1699 if (free_chan) {
1700 consumer_del_channel(free_chan);
1701 }
1702
1703free_stream:
58b1f425 1704 call_rcu(&stream->node.head, consumer_free_stream);
fb3a43a9
DG
1705}
1706
1707/*
1708 * Action done with the metadata stream when adding it to the consumer internal
1709 * data structures to handle it.
1710 */
e316aad5
DG
1711static int consumer_add_metadata_stream(struct lttng_consumer_stream *stream,
1712 struct lttng_ht *ht)
fb3a43a9 1713{
e316aad5 1714 int ret = 0;
fb3a43a9
DG
1715 struct consumer_relayd_sock_pair *relayd;
1716
e316aad5
DG
1717 assert(stream);
1718 assert(ht);
1719
1720 DBG3("Adding metadata stream %d to hash table", stream->wait_fd);
1721
1722 pthread_mutex_lock(&consumer_data.lock);
1723
e316aad5
DG
1724 /*
1725 * From here, refcounts are updated so be _careful_ when returning an error
1726 * after this point.
1727 */
1728
fb3a43a9 1729 rcu_read_lock();
e316aad5 1730 /* Find relayd and, if one is found, increment refcount. */
fb3a43a9
DG
1731 relayd = consumer_find_relayd(stream->net_seq_idx);
1732 if (relayd != NULL) {
1733 uatomic_inc(&relayd->refcount);
1734 }
e316aad5
DG
1735
1736 /* Update channel refcount once added without error(s). */
1737 uatomic_inc(&stream->chan->refcount);
1738
1739 /*
1740 * When nb_init_streams reaches 0, we don't need to trigger any action in
1741 * terms of destroying the associated channel, because the action that
1742 * causes the count to become 0 also causes a stream to be added. The
1743 * channel deletion will thus be triggered by the following removal of this
1744 * stream.
1745 */
1746 if (uatomic_read(&stream->chan->nb_init_streams) > 0) {
1747 uatomic_dec(&stream->chan->nb_init_streams);
1748 }
1749
43c34bc3
DG
1750 /* Steal stream identifier to avoid having streams with the same key */
1751 consumer_steal_stream_key(stream->key, ht);
1752
58b1f425 1753 lttng_ht_add_unique_ulong(ht, &stream->node);
ca22feea
DG
1754
1755 /*
1756 * Add stream to the stream_list_ht of the consumer data. No need to steal
1757 * the key since the HT does not use it and we allow to add redundant keys
1758 * into this table.
1759 */
1760 lttng_ht_add_ulong(consumer_data.stream_list_ht, &stream->node_session_id);
1761
fb3a43a9 1762 rcu_read_unlock();
e316aad5 1763
e316aad5
DG
1764 pthread_mutex_unlock(&consumer_data.lock);
1765 return ret;
fb3a43a9
DG
1766}
1767
1768/*
1769 * Thread polls on metadata file descriptor and write them on disk or on the
1770 * network.
1771 */
7d980def 1772void *consumer_thread_metadata_poll(void *data)
fb3a43a9
DG
1773{
1774 int ret, i, pollfd;
1775 uint32_t revents, nb_fd;
e316aad5 1776 struct lttng_consumer_stream *stream = NULL;
fb3a43a9
DG
1777 struct lttng_ht_iter iter;
1778 struct lttng_ht_node_ulong *node;
fb3a43a9
DG
1779 struct lttng_poll_event events;
1780 struct lttng_consumer_local_data *ctx = data;
1781 ssize_t len;
1782
1783 rcu_register_thread();
1784
1785 DBG("Thread metadata poll started");
1786
fb3a43a9
DG
1787 /* Size is set to 1 for the consumer_metadata pipe */
1788 ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
1789 if (ret < 0) {
1790 ERR("Poll set creation failed");
1791 goto end;
1792 }
1793
1794 ret = lttng_poll_add(&events, ctx->consumer_metadata_pipe[0], LPOLLIN);
1795 if (ret < 0) {
1796 goto end;
1797 }
1798
1799 /* Main loop */
1800 DBG("Metadata main loop started");
1801
1802 while (1) {
1803 lttng_poll_reset(&events);
1804
1805 nb_fd = LTTNG_POLL_GETNB(&events);
1806
1807 /* Only the metadata pipe is set */
1808 if (nb_fd == 0 && consumer_quit == 1) {
1809 goto end;
1810 }
1811
1812restart:
1813 DBG("Metadata poll wait with %d fd(s)", nb_fd);
1814 ret = lttng_poll_wait(&events, -1);
1815 DBG("Metadata event catched in thread");
1816 if (ret < 0) {
1817 if (errno == EINTR) {
e316aad5 1818 ERR("Poll EINTR catched");
fb3a43a9
DG
1819 goto restart;
1820 }
1821 goto error;
1822 }
1823
e316aad5 1824 /* From here, the event is a metadata wait fd */
fb3a43a9
DG
1825 for (i = 0; i < nb_fd; i++) {
1826 revents = LTTNG_POLL_GETEV(&events, i);
1827 pollfd = LTTNG_POLL_GETFD(&events, i);
1828
e316aad5
DG
1829 /* Just don't waste time if no returned events for the fd */
1830 if (!revents) {
1831 continue;
1832 }
1833
fb3a43a9 1834 if (pollfd == ctx->consumer_metadata_pipe[0]) {
4adabd61 1835 if (revents & (LPOLLERR | LPOLLHUP )) {
fb3a43a9
DG
1836 DBG("Metadata thread pipe hung up");
1837 /*
1838 * Remove the pipe from the poll set and continue the loop
1839 * since their might be data to consume.
1840 */
1841 lttng_poll_del(&events, ctx->consumer_metadata_pipe[0]);
1842 close(ctx->consumer_metadata_pipe[0]);
1843 continue;
1844 } else if (revents & LPOLLIN) {
fb3a43a9 1845 do {
633d0084
DG
1846 /* Get the stream pointer received */
1847 ret = read(pollfd, &stream, sizeof(stream));
fb3a43a9 1848 } while (ret < 0 && errno == EINTR);
633d0084
DG
1849 if (ret < 0 ||
1850 ret < sizeof(struct lttng_consumer_stream *)) {
fb3a43a9 1851 PERROR("read metadata stream");
fb3a43a9
DG
1852 /*
1853 * Let's continue here and hope we can still work
1854 * without stopping the consumer. XXX: Should we?
1855 */
1856 continue;
1857 }
1858
1859 DBG("Adding metadata stream %d to poll set",
1860 stream->wait_fd);
1861
e316aad5
DG
1862 ret = consumer_add_metadata_stream(stream, metadata_ht);
1863 if (ret) {
1864 ERR("Unable to add metadata stream");
1865 /* Stream was not setup properly. Continuing. */
1866 consumer_del_metadata_stream(stream, NULL);
1867 continue;
1868 }
fb3a43a9
DG
1869
1870 /* Add metadata stream to the global poll events list */
1871 lttng_poll_add(&events, stream->wait_fd,
1872 LPOLLIN | LPOLLPRI);
fb3a43a9
DG
1873 }
1874
e316aad5 1875 /* Handle other stream */
fb3a43a9
DG
1876 continue;
1877 }
1878
d09e1200 1879 rcu_read_lock();
fb3a43a9
DG
1880 lttng_ht_lookup(metadata_ht, (void *)((unsigned long) pollfd),
1881 &iter);
1882 node = lttng_ht_iter_get_node_ulong(&iter);
e316aad5 1883 assert(node);
fb3a43a9
DG
1884
1885 stream = caa_container_of(node, struct lttng_consumer_stream,
58b1f425 1886 node);
fb3a43a9 1887
e316aad5 1888 /* Check for error event */
4adabd61 1889 if (revents & (LPOLLERR | LPOLLHUP)) {
e316aad5 1890 DBG("Metadata fd %d is hup|err.", pollfd);
fb3a43a9
DG
1891 if (!stream->hangup_flush_done
1892 && (consumer_data.type == LTTNG_CONSUMER32_UST
1893 || consumer_data.type == LTTNG_CONSUMER64_UST)) {
1894 DBG("Attempting to flush and consume the UST buffers");
1895 lttng_ustconsumer_on_stream_hangup(stream);
1896
1897 /* We just flushed the stream now read it. */
4bb94b75
DG
1898 do {
1899 len = ctx->on_buffer_ready(stream, ctx);
1900 /*
1901 * We don't check the return value here since if we get
1902 * a negative len, it means an error occured thus we
1903 * simply remove it from the poll set and free the
1904 * stream.
1905 */
1906 } while (len > 0);
fb3a43a9
DG
1907 }
1908
fb3a43a9 1909 lttng_poll_del(&events, stream->wait_fd);
e316aad5
DG
1910 /*
1911 * This call update the channel states, closes file descriptors
1912 * and securely free the stream.
1913 */
1914 consumer_del_metadata_stream(stream, metadata_ht);
1915 } else if (revents & (LPOLLIN | LPOLLPRI)) {
1916 /* Get the data out of the metadata file descriptor */
1917 DBG("Metadata available on fd %d", pollfd);
1918 assert(stream->wait_fd == pollfd);
1919
1920 len = ctx->on_buffer_ready(stream, ctx);
1921 /* It's ok to have an unavailable sub-buffer */
b64403e3 1922 if (len < 0 && len != -EAGAIN && len != -ENODATA) {
ab1027f4
DG
1923 /* Clean up stream from consumer and free it. */
1924 lttng_poll_del(&events, stream->wait_fd);
1925 consumer_del_metadata_stream(stream, metadata_ht);
e316aad5
DG
1926 } else if (len > 0) {
1927 stream->data_read = 1;
1928 }
fb3a43a9 1929 }
e316aad5
DG
1930
1931 /* Release RCU lock for the stream looked up */
d09e1200 1932 rcu_read_unlock();
fb3a43a9
DG
1933 }
1934 }
1935
1936error:
1937end:
1938 DBG("Metadata poll thread exiting");
1939 lttng_poll_clean(&events);
1940
1941 if (metadata_ht) {
1942 destroy_stream_ht(metadata_ht);
1943 }
1944
1945 rcu_unregister_thread();
1946 return NULL;
1947}
1948
3bd1e081 1949/*
e4421fec 1950 * This thread polls the fds in the set to consume the data and write
3bd1e081
MD
1951 * it to tracefile if necessary.
1952 */
7d980def 1953void *consumer_thread_data_poll(void *data)
3bd1e081
MD
1954{
1955 int num_rdy, num_hup, high_prio, ret, i;
1956 struct pollfd *pollfd = NULL;
1957 /* local view of the streams */
c869f647 1958 struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL;
3bd1e081
MD
1959 /* local view of consumer_data.fds_count */
1960 int nb_fd = 0;
3bd1e081 1961 struct lttng_consumer_local_data *ctx = data;
00e2e675 1962 ssize_t len;
3bd1e081 1963
e7b994a3
DG
1964 rcu_register_thread();
1965
43c34bc3
DG
1966 data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1967 if (data_ht == NULL) {
1968 goto end;
1969 }
1970
effcf122 1971 local_stream = zmalloc(sizeof(struct lttng_consumer_stream));
3bd1e081
MD
1972
1973 while (1) {
1974 high_prio = 0;
1975 num_hup = 0;
1976
1977 /*
e4421fec 1978 * the fds set has been updated, we need to update our
3bd1e081
MD
1979 * local array as well
1980 */
1981 pthread_mutex_lock(&consumer_data.lock);
1982 if (consumer_data.need_update) {
1983 if (pollfd != NULL) {
1984 free(pollfd);
1985 pollfd = NULL;
1986 }
1987 if (local_stream != NULL) {
1988 free(local_stream);
1989 local_stream = NULL;
1990 }
1991
50f8ae69 1992 /* allocate for all fds + 1 for the consumer_data_pipe */
effcf122 1993 pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd));
3bd1e081 1994 if (pollfd == NULL) {
7a57cf92 1995 PERROR("pollfd malloc");
3bd1e081
MD
1996 pthread_mutex_unlock(&consumer_data.lock);
1997 goto end;
1998 }
1999
50f8ae69 2000 /* allocate for all fds + 1 for the consumer_data_pipe */
effcf122 2001 local_stream = zmalloc((consumer_data.stream_count + 1) *
3bd1e081
MD
2002 sizeof(struct lttng_consumer_stream));
2003 if (local_stream == NULL) {
7a57cf92 2004 PERROR("local_stream malloc");
3bd1e081
MD
2005 pthread_mutex_unlock(&consumer_data.lock);
2006 goto end;
2007 }
43c34bc3
DG
2008 ret = consumer_update_poll_array(ctx, &pollfd, local_stream,
2009 data_ht);
3bd1e081
MD
2010 if (ret < 0) {
2011 ERR("Error in allocating pollfd or local_outfds");
f73fabfd 2012 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR);
3bd1e081
MD
2013 pthread_mutex_unlock(&consumer_data.lock);
2014 goto end;
2015 }
2016 nb_fd = ret;
2017 consumer_data.need_update = 0;
2018 }
2019 pthread_mutex_unlock(&consumer_data.lock);
2020
4078b776
MD
2021 /* No FDs and consumer_quit, consumer_cleanup the thread */
2022 if (nb_fd == 0 && consumer_quit == 1) {
2023 goto end;
2024 }
3bd1e081 2025 /* poll on the array of fds */
88f2b785 2026 restart:
3bd1e081
MD
2027 DBG("polling on %d fd", nb_fd + 1);
2028 num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout);
2029 DBG("poll num_rdy : %d", num_rdy);
2030 if (num_rdy == -1) {
88f2b785
MD
2031 /*
2032 * Restart interrupted system call.
2033 */
2034 if (errno == EINTR) {
2035 goto restart;
2036 }
7a57cf92 2037 PERROR("Poll error");
f73fabfd 2038 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR);
3bd1e081
MD
2039 goto end;
2040 } else if (num_rdy == 0) {
2041 DBG("Polling thread timed out");
2042 goto end;
2043 }
2044
3bd1e081 2045 /*
50f8ae69 2046 * If the consumer_data_pipe triggered poll go directly to the
00e2e675
DG
2047 * beginning of the loop to update the array. We want to prioritize
2048 * array update over low-priority reads.
3bd1e081 2049 */
509bb1cf 2050 if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) {
04fdd819 2051 size_t pipe_readlen;
04fdd819 2052
50f8ae69 2053 DBG("consumer_data_pipe wake up");
04fdd819
MD
2054 /* Consume 1 byte of pipe data */
2055 do {
50f8ae69 2056 pipe_readlen = read(ctx->consumer_data_pipe[0], &new_stream,
c869f647 2057 sizeof(new_stream));
04fdd819 2058 } while (pipe_readlen == -1 && errno == EINTR);
c869f647
DG
2059
2060 /*
2061 * If the stream is NULL, just ignore it. It's also possible that
2062 * the sessiond poll thread changed the consumer_quit state and is
2063 * waking us up to test it.
2064 */
2065 if (new_stream == NULL) {
2066 continue;
2067 }
2068
43c34bc3 2069 ret = consumer_add_stream(new_stream, data_ht);
c869f647
DG
2070 if (ret) {
2071 ERR("Consumer add stream %d failed. Continuing",
2072 new_stream->key);
2073 /*
2074 * At this point, if the add_stream fails, it is not in the
2075 * hash table thus passing the NULL value here.
2076 */
2077 consumer_del_stream(new_stream, NULL);
2078 }
2079
2080 /* Continue to update the local streams and handle prio ones */
3bd1e081
MD
2081 continue;
2082 }
2083
2084 /* Take care of high priority channels first. */
2085 for (i = 0; i < nb_fd; i++) {
fb3a43a9 2086 if (pollfd[i].revents & POLLPRI) {
d41f73b7
MD
2087 DBG("Urgent read on fd %d", pollfd[i].fd);
2088 high_prio = 1;
4078b776 2089 len = ctx->on_buffer_ready(local_stream[i], ctx);
d41f73b7 2090 /* it's ok to have an unavailable sub-buffer */
b64403e3 2091 if (len < 0 && len != -EAGAIN && len != -ENODATA) {
ab1027f4
DG
2092 /* Clean the stream and free it. */
2093 consumer_del_stream(local_stream[i], data_ht);
4078b776
MD
2094 } else if (len > 0) {
2095 local_stream[i]->data_read = 1;
d41f73b7 2096 }
3bd1e081
MD
2097 }
2098 }
2099
4078b776
MD
2100 /*
2101 * If we read high prio channel in this loop, try again
2102 * for more high prio data.
2103 */
2104 if (high_prio) {
3bd1e081
MD
2105 continue;
2106 }
2107
2108 /* Take care of low priority channels. */
4078b776
MD
2109 for (i = 0; i < nb_fd; i++) {
2110 if ((pollfd[i].revents & POLLIN) ||
2111 local_stream[i]->hangup_flush_done) {
4078b776
MD
2112 DBG("Normal read on fd %d", pollfd[i].fd);
2113 len = ctx->on_buffer_ready(local_stream[i], ctx);
2114 /* it's ok to have an unavailable sub-buffer */
b64403e3 2115 if (len < 0 && len != -EAGAIN && len != -ENODATA) {
ab1027f4
DG
2116 /* Clean the stream and free it. */
2117 consumer_del_stream(local_stream[i], data_ht);
4078b776
MD
2118 } else if (len > 0) {
2119 local_stream[i]->data_read = 1;
2120 }
2121 }
2122 }
2123
2124 /* Handle hangup and errors */
2125 for (i = 0; i < nb_fd; i++) {
2126 if (!local_stream[i]->hangup_flush_done
2127 && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL))
2128 && (consumer_data.type == LTTNG_CONSUMER32_UST
2129 || consumer_data.type == LTTNG_CONSUMER64_UST)) {
2130 DBG("fd %d is hup|err|nval. Attempting flush and read.",
2131 pollfd[i].fd);
2132 lttng_ustconsumer_on_stream_hangup(local_stream[i]);
2133 /* Attempt read again, for the data we just flushed. */
2134 local_stream[i]->data_read = 1;
2135 }
2136 /*
2137 * If the poll flag is HUP/ERR/NVAL and we have
2138 * read no data in this pass, we can remove the
2139 * stream from its hash table.
2140 */
2141 if ((pollfd[i].revents & POLLHUP)) {
2142 DBG("Polling fd %d tells it has hung up.", pollfd[i].fd);
2143 if (!local_stream[i]->data_read) {
43c34bc3 2144 consumer_del_stream(local_stream[i], data_ht);
4078b776
MD
2145 num_hup++;
2146 }
2147 } else if (pollfd[i].revents & POLLERR) {
2148 ERR("Error returned in polling fd %d.", pollfd[i].fd);
2149 if (!local_stream[i]->data_read) {
43c34bc3 2150 consumer_del_stream(local_stream[i], data_ht);
4078b776
MD
2151 num_hup++;
2152 }
2153 } else if (pollfd[i].revents & POLLNVAL) {
2154 ERR("Polling fd %d tells fd is not open.", pollfd[i].fd);
2155 if (!local_stream[i]->data_read) {
43c34bc3 2156 consumer_del_stream(local_stream[i], data_ht);
4078b776 2157 num_hup++;
3bd1e081
MD
2158 }
2159 }
4078b776 2160 local_stream[i]->data_read = 0;
3bd1e081
MD
2161 }
2162 }
2163end:
2164 DBG("polling thread exiting");
2165 if (pollfd != NULL) {
2166 free(pollfd);
2167 pollfd = NULL;
2168 }
2169 if (local_stream != NULL) {
2170 free(local_stream);
2171 local_stream = NULL;
2172 }
fb3a43a9
DG
2173
2174 /*
2175 * Close the write side of the pipe so epoll_wait() in
7d980def
DG
2176 * consumer_thread_metadata_poll can catch it. The thread is monitoring the
2177 * read side of the pipe. If we close them both, epoll_wait strangely does
2178 * not return and could create a endless wait period if the pipe is the
2179 * only tracked fd in the poll set. The thread will take care of closing
2180 * the read side.
fb3a43a9
DG
2181 */
2182 close(ctx->consumer_metadata_pipe[1]);
fb3a43a9 2183
43c34bc3
DG
2184 if (data_ht) {
2185 destroy_data_stream_ht(data_ht);
2186 }
2187
e7b994a3 2188 rcu_unregister_thread();
3bd1e081
MD
2189 return NULL;
2190}
2191
2192/*
2193 * This thread listens on the consumerd socket and receives the file
2194 * descriptors from the session daemon.
2195 */
7d980def 2196void *consumer_thread_sessiond_poll(void *data)
3bd1e081
MD
2197{
2198 int sock, client_socket, ret;
2199 /*
2200 * structure to poll for incoming data on communication socket avoids
2201 * making blocking sockets.
2202 */
2203 struct pollfd consumer_sockpoll[2];
2204 struct lttng_consumer_local_data *ctx = data;
2205
e7b994a3
DG
2206 rcu_register_thread();
2207
3bd1e081
MD
2208 DBG("Creating command socket %s", ctx->consumer_command_sock_path);
2209 unlink(ctx->consumer_command_sock_path);
2210 client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path);
2211 if (client_socket < 0) {
2212 ERR("Cannot create command socket");
2213 goto end;
2214 }
2215
2216 ret = lttcomm_listen_unix_sock(client_socket);
2217 if (ret < 0) {
2218 goto end;
2219 }
2220
32258573 2221 DBG("Sending ready command to lttng-sessiond");
f73fabfd 2222 ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY);
3bd1e081
MD
2223 /* return < 0 on error, but == 0 is not fatal */
2224 if (ret < 0) {
32258573 2225 ERR("Error sending ready command to lttng-sessiond");
3bd1e081
MD
2226 goto end;
2227 }
2228
2229 ret = fcntl(client_socket, F_SETFL, O_NONBLOCK);
2230 if (ret < 0) {
7a57cf92 2231 PERROR("fcntl O_NONBLOCK");
3bd1e081
MD
2232 goto end;
2233 }
2234
2235 /* prepare the FDs to poll : to client socket and the should_quit pipe */
2236 consumer_sockpoll[0].fd = ctx->consumer_should_quit[0];
2237 consumer_sockpoll[0].events = POLLIN | POLLPRI;
2238 consumer_sockpoll[1].fd = client_socket;
2239 consumer_sockpoll[1].events = POLLIN | POLLPRI;
2240
2241 if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
2242 goto end;
2243 }
2244 DBG("Connection on client_socket");
2245
2246 /* Blocking call, waiting for transmission */
2247 sock = lttcomm_accept_unix_sock(client_socket);
2248 if (sock <= 0) {
2249 WARN("On accept");
2250 goto end;
2251 }
2252 ret = fcntl(sock, F_SETFL, O_NONBLOCK);
2253 if (ret < 0) {
7a57cf92 2254 PERROR("fcntl O_NONBLOCK");
3bd1e081
MD
2255 goto end;
2256 }
2257
2258 /* update the polling structure to poll on the established socket */
2259 consumer_sockpoll[1].fd = sock;
2260 consumer_sockpoll[1].events = POLLIN | POLLPRI;
2261
2262 while (1) {
2263 if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
2264 goto end;
2265 }
2266 DBG("Incoming command on sock");
2267 ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll);
2268 if (ret == -ENOENT) {
2269 DBG("Received STOP command");
2270 goto end;
2271 }
4cbc1a04
DG
2272 if (ret <= 0) {
2273 /*
2274 * This could simply be a session daemon quitting. Don't output
2275 * ERR() here.
2276 */
2277 DBG("Communication interrupted on command socket");
3bd1e081
MD
2278 goto end;
2279 }
2280 if (consumer_quit) {
2281 DBG("consumer_thread_receive_fds received quit from signal");
2282 goto end;
2283 }
2284 DBG("received fds on sock");
2285 }
2286end:
2287 DBG("consumer_thread_receive_fds exiting");
2288
2289 /*
2290 * when all fds have hung up, the polling thread
2291 * can exit cleanly
2292 */
2293 consumer_quit = 1;
2294
2295 /*
2296 * 2s of grace period, if no polling events occur during
2297 * this period, the polling thread will exit even if there
2298 * are still open FDs (should not happen, but safety mechanism).
2299 */
2300 consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT;
2301
04fdd819 2302 /*
c869f647
DG
2303 * Notify the data poll thread to poll back again and test the
2304 * consumer_quit state to quit gracefully.
04fdd819
MD
2305 */
2306 do {
c869f647
DG
2307 struct lttng_consumer_stream *null_stream = NULL;
2308
50f8ae69 2309 ret = write(ctx->consumer_data_pipe[1], &null_stream,
c869f647 2310 sizeof(null_stream));
6f94560a 2311 } while (ret < 0 && errno == EINTR);
c869f647 2312
e7b994a3 2313 rcu_unregister_thread();
3bd1e081
MD
2314 return NULL;
2315}
d41f73b7 2316
4078b776 2317ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
d41f73b7
MD
2318 struct lttng_consumer_local_data *ctx)
2319{
2320 switch (consumer_data.type) {
2321 case LTTNG_CONSUMER_KERNEL:
2322 return lttng_kconsumer_read_subbuffer(stream, ctx);
7753dea8
MD
2323 case LTTNG_CONSUMER32_UST:
2324 case LTTNG_CONSUMER64_UST:
d41f73b7
MD
2325 return lttng_ustconsumer_read_subbuffer(stream, ctx);
2326 default:
2327 ERR("Unknown consumer_data type");
2328 assert(0);
2329 return -ENOSYS;
2330 }
2331}
2332
2333int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream)
2334{
2335 switch (consumer_data.type) {
2336 case LTTNG_CONSUMER_KERNEL:
2337 return lttng_kconsumer_on_recv_stream(stream);
7753dea8
MD
2338 case LTTNG_CONSUMER32_UST:
2339 case LTTNG_CONSUMER64_UST:
d41f73b7
MD
2340 return lttng_ustconsumer_on_recv_stream(stream);
2341 default:
2342 ERR("Unknown consumer_data type");
2343 assert(0);
2344 return -ENOSYS;
2345 }
2346}
e4421fec
DG
2347
2348/*
2349 * Allocate and set consumer data hash tables.
2350 */
2351void lttng_consumer_init(void)
2352{
e4421fec 2353 consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
00e2e675 2354 consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
53632229 2355 consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
43c34bc3
DG
2356
2357 metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
2358 assert(metadata_ht);
2359 data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
2360 assert(data_ht);
e4421fec 2361}
7735ef9e
DG
2362
2363/*
2364 * Process the ADD_RELAYD command receive by a consumer.
2365 *
2366 * This will create a relayd socket pair and add it to the relayd hash table.
2367 * The caller MUST acquire a RCU read side lock before calling it.
2368 */
2369int consumer_add_relayd_socket(int net_seq_idx, int sock_type,
2370 struct lttng_consumer_local_data *ctx, int sock,
2371 struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock)
2372{
2373 int fd, ret = -1;
2374 struct consumer_relayd_sock_pair *relayd;
2375
2376 DBG("Consumer adding relayd socket (idx: %d)", net_seq_idx);
2377
2378 /* Get relayd reference if exists. */
2379 relayd = consumer_find_relayd(net_seq_idx);
2380 if (relayd == NULL) {
2381 /* Not found. Allocate one. */
2382 relayd = consumer_allocate_relayd_sock_pair(net_seq_idx);
2383 if (relayd == NULL) {
f73fabfd 2384 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
7735ef9e
DG
2385 goto error;
2386 }
2387 }
2388
2389 /* Poll on consumer socket. */
2390 if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
2391 ret = -EINTR;
2392 goto error;
2393 }
2394
2395 /* Get relayd socket from session daemon */
2396 ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1);
2397 if (ret != sizeof(fd)) {
f73fabfd 2398 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD);
7735ef9e
DG
2399 ret = -1;
2400 goto error;
2401 }
2402
2403 /* Copy socket information and received FD */
2404 switch (sock_type) {
2405 case LTTNG_STREAM_CONTROL:
2406 /* Copy received lttcomm socket */
2407 lttcomm_copy_sock(&relayd->control_sock, relayd_sock);
2408 ret = lttcomm_create_sock(&relayd->control_sock);
2409 if (ret < 0) {
2410 goto error;
2411 }
2412
2413 /* Close the created socket fd which is useless */
2414 close(relayd->control_sock.fd);
2415
2416 /* Assign new file descriptor */
2417 relayd->control_sock.fd = fd;
2418 break;
2419 case LTTNG_STREAM_DATA:
2420 /* Copy received lttcomm socket */
2421 lttcomm_copy_sock(&relayd->data_sock, relayd_sock);
2422 ret = lttcomm_create_sock(&relayd->data_sock);
2423 if (ret < 0) {
2424 goto error;
2425 }
2426
2427 /* Close the created socket fd which is useless */
2428 close(relayd->data_sock.fd);
2429
2430 /* Assign new file descriptor */
2431 relayd->data_sock.fd = fd;
2432 break;
2433 default:
2434 ERR("Unknown relayd socket type (%d)", sock_type);
2435 goto error;
2436 }
2437
2438 DBG("Consumer %s socket created successfully with net idx %d (fd: %d)",
2439 sock_type == LTTNG_STREAM_CONTROL ? "control" : "data",
2440 relayd->net_seq_idx, fd);
2441
2442 /*
2443 * Add relayd socket pair to consumer data hashtable. If object already
2444 * exists or on error, the function gracefully returns.
2445 */
d09e1200 2446 add_relayd(relayd);
7735ef9e
DG
2447
2448 /* All good! */
2449 ret = 0;
2450
2451error:
2452 return ret;
2453}
ca22feea
DG
2454
2455/*
2456 * Check if for a given session id there is still data needed to be extract
2457 * from the buffers.
2458 *
2459 * Return 1 if data is in fact available to be read or else 0.
2460 */
2461int consumer_data_available(uint64_t id)
2462{
2463 int ret;
2464 struct lttng_ht_iter iter;
2465 struct lttng_ht *ht;
2466 struct lttng_consumer_stream *stream;
c8f59ee5 2467 struct consumer_relayd_sock_pair *relayd;
ca22feea
DG
2468 int (*data_available)(struct lttng_consumer_stream *);
2469
2470 DBG("Consumer data available command on session id %" PRIu64, id);
2471
6f6eda74 2472 rcu_read_lock();
ca22feea
DG
2473 pthread_mutex_lock(&consumer_data.lock);
2474
2475 switch (consumer_data.type) {
2476 case LTTNG_CONSUMER_KERNEL:
2477 data_available = lttng_kconsumer_data_available;
2478 break;
2479 case LTTNG_CONSUMER32_UST:
2480 case LTTNG_CONSUMER64_UST:
2481 data_available = lttng_ustconsumer_data_available;
2482 break;
2483 default:
2484 ERR("Unknown consumer data type");
2485 assert(0);
2486 }
2487
2488 /* Ease our life a bit */
2489 ht = consumer_data.stream_list_ht;
2490
c8f59ee5
DG
2491 cds_lfht_for_each_entry_duplicate(ht->ht,
2492 ht->hash_fct((void *)((unsigned long) id), 0x42UL),
ca22feea
DG
2493 ht->match_fct, (void *)((unsigned long) id),
2494 &iter.iter, stream, node_session_id.node) {
2495 /* Check the stream for data. */
2496 ret = data_available(stream);
2497 if (ret == 0) {
2498 goto data_not_available;
2499 }
ca22feea 2500
c8f59ee5
DG
2501 if (stream->net_seq_idx != -1) {
2502 relayd = consumer_find_relayd(stream->net_seq_idx);
2503 assert(relayd);
2504
2505 pthread_mutex_lock(&stream->lock);
2506 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
2507 if (stream->metadata_flag) {
2508 ret = relayd_quiescent_control(&relayd->control_sock);
2509 } else {
2510 ret = relayd_data_available(&relayd->control_sock,
2511 stream->relayd_stream_id, stream->next_net_seq_num);
2512 }
2513 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
2514 pthread_mutex_unlock(&stream->lock);
2515 if (ret == 0) {
2516 goto data_not_available;
2517 }
2518 }
2519 }
ca22feea
DG
2520
2521 /*
2522 * Finding _no_ node in the hash table means that the stream(s) have been
2523 * removed thus data is guaranteed to be available for analysis from the
2524 * trace files. This is *only* true for local consumer and not network
2525 * streaming.
2526 */
2527
2528 /* Data is available to be read by a viewer. */
2529 pthread_mutex_unlock(&consumer_data.lock);
c8f59ee5 2530 rcu_read_unlock();
ca22feea
DG
2531 return 1;
2532
2533data_not_available:
2534 /* Data is still being extracted from buffers. */
2535 pthread_mutex_unlock(&consumer_data.lock);
c8f59ee5 2536 rcu_read_unlock();
ca22feea
DG
2537 return 0;
2538}
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