Fix: channel and stream leak in consumerd
[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>
331744e3 31#include <signal.h>
3bd1e081 32
990570ed 33#include <common/common.h>
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34#include <common/utils.h>
35#include <common/compat/poll.h>
10a8a223 36#include <common/kernel-ctl/kernel-ctl.h>
00e2e675 37#include <common/sessiond-comm/relayd.h>
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38#include <common/sessiond-comm/sessiond-comm.h>
39#include <common/kernel-consumer/kernel-consumer.h>
00e2e675 40#include <common/relayd/relayd.h>
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41#include <common/ust-consumer/ust-consumer.h>
42
43#include "consumer.h"
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44
45struct lttng_consumer_global_data consumer_data = {
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46 .stream_count = 0,
47 .need_update = 1,
48 .type = LTTNG_CONSUMER_UNKNOWN,
49};
50
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51enum consumer_channel_action {
52 CONSUMER_CHANNEL_ADD,
a0cbdd2e 53 CONSUMER_CHANNEL_DEL,
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54 CONSUMER_CHANNEL_QUIT,
55};
56
57struct consumer_channel_msg {
58 enum consumer_channel_action action;
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59 struct lttng_consumer_channel *chan; /* add */
60 uint64_t key; /* del */
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61};
62
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63/*
64 * Flag to inform the polling thread to quit when all fd hung up. Updated by
65 * the consumer_thread_receive_fds when it notices that all fds has hung up.
66 * Also updated by the signal handler (consumer_should_exit()). Read by the
67 * polling threads.
68 */
a98dae5f 69volatile int consumer_quit;
3bd1e081 70
43c34bc3 71/*
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72 * Global hash table containing respectively metadata and data streams. The
73 * stream element in this ht should only be updated by the metadata poll thread
74 * for the metadata and the data poll thread for the data.
75 */
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76static struct lttng_ht *metadata_ht;
77static struct lttng_ht *data_ht;
43c34bc3 78
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79/*
80 * Notify a thread lttng pipe to poll back again. This usually means that some
81 * global state has changed so we just send back the thread in a poll wait
82 * call.
83 */
84static void notify_thread_lttng_pipe(struct lttng_pipe *pipe)
85{
86 struct lttng_consumer_stream *null_stream = NULL;
87
88 assert(pipe);
89
90 (void) lttng_pipe_write(pipe, &null_stream, sizeof(null_stream));
91}
92
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93static void notify_channel_pipe(struct lttng_consumer_local_data *ctx,
94 struct lttng_consumer_channel *chan,
a0cbdd2e 95 uint64_t key,
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96 enum consumer_channel_action action)
97{
98 struct consumer_channel_msg msg;
99 int ret;
100
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101 memset(&msg, 0, sizeof(msg));
102
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103 msg.action = action;
104 msg.chan = chan;
f21dae48 105 msg.key = key;
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106 do {
107 ret = write(ctx->consumer_channel_pipe[1], &msg, sizeof(msg));
108 } while (ret < 0 && errno == EINTR);
109}
110
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111void notify_thread_del_channel(struct lttng_consumer_local_data *ctx,
112 uint64_t key)
113{
114 notify_channel_pipe(ctx, NULL, key, CONSUMER_CHANNEL_DEL);
115}
116
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117static int read_channel_pipe(struct lttng_consumer_local_data *ctx,
118 struct lttng_consumer_channel **chan,
a0cbdd2e 119 uint64_t *key,
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120 enum consumer_channel_action *action)
121{
122 struct consumer_channel_msg msg;
123 int ret;
124
125 do {
126 ret = read(ctx->consumer_channel_pipe[0], &msg, sizeof(msg));
127 } while (ret < 0 && errno == EINTR);
128 if (ret > 0) {
129 *action = msg.action;
130 *chan = msg.chan;
a0cbdd2e 131 *key = msg.key;
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132 }
133 return ret;
134}
135
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136/*
137 * Find a stream. The consumer_data.lock must be locked during this
138 * call.
139 */
d88aee68 140static struct lttng_consumer_stream *find_stream(uint64_t key,
8389e4f8 141 struct lttng_ht *ht)
3bd1e081 142{
e4421fec 143 struct lttng_ht_iter iter;
d88aee68 144 struct lttng_ht_node_u64 *node;
e4421fec 145 struct lttng_consumer_stream *stream = NULL;
3bd1e081 146
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147 assert(ht);
148
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149 /* -1ULL keys are lookup failures */
150 if (key == (uint64_t) -1ULL) {
7ad0a0cb 151 return NULL;
7a57cf92 152 }
e4421fec 153
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154 rcu_read_lock();
155
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156 lttng_ht_lookup(ht, &key, &iter);
157 node = lttng_ht_iter_get_node_u64(&iter);
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158 if (node != NULL) {
159 stream = caa_container_of(node, struct lttng_consumer_stream, node);
3bd1e081 160 }
e4421fec 161
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162 rcu_read_unlock();
163
e4421fec 164 return stream;
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165}
166
ffe60014 167static void steal_stream_key(int key, struct lttng_ht *ht)
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168{
169 struct lttng_consumer_stream *stream;
170
04253271 171 rcu_read_lock();
ffe60014 172 stream = find_stream(key, ht);
04253271 173 if (stream) {
d88aee68 174 stream->key = -1ULL;
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175 /*
176 * We don't want the lookup to match, but we still need
177 * to iterate on this stream when iterating over the hash table. Just
178 * change the node key.
179 */
d88aee68 180 stream->node.key = -1ULL;
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181 }
182 rcu_read_unlock();
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183}
184
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185/*
186 * Return a channel object for the given key.
187 *
188 * RCU read side lock MUST be acquired before calling this function and
189 * protects the channel ptr.
190 */
d88aee68 191struct lttng_consumer_channel *consumer_find_channel(uint64_t key)
3bd1e081 192{
e4421fec 193 struct lttng_ht_iter iter;
d88aee68 194 struct lttng_ht_node_u64 *node;
e4421fec 195 struct lttng_consumer_channel *channel = NULL;
3bd1e081 196
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197 /* -1ULL keys are lookup failures */
198 if (key == (uint64_t) -1ULL) {
7ad0a0cb 199 return NULL;
7a57cf92 200 }
e4421fec 201
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202 lttng_ht_lookup(consumer_data.channel_ht, &key, &iter);
203 node = lttng_ht_iter_get_node_u64(&iter);
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204 if (node != NULL) {
205 channel = caa_container_of(node, struct lttng_consumer_channel, node);
3bd1e081 206 }
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207
208 return channel;
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209}
210
ffe60014 211static void free_stream_rcu(struct rcu_head *head)
7ad0a0cb 212{
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213 struct lttng_ht_node_u64 *node =
214 caa_container_of(head, struct lttng_ht_node_u64, head);
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215 struct lttng_consumer_stream *stream =
216 caa_container_of(node, struct lttng_consumer_stream, node);
7ad0a0cb 217
ffe60014 218 free(stream);
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219}
220
ffe60014 221static void free_channel_rcu(struct rcu_head *head)
702b1ea4 222{
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223 struct lttng_ht_node_u64 *node =
224 caa_container_of(head, struct lttng_ht_node_u64, head);
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225 struct lttng_consumer_channel *channel =
226 caa_container_of(node, struct lttng_consumer_channel, node);
702b1ea4 227
ffe60014 228 free(channel);
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229}
230
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231/*
232 * RCU protected relayd socket pair free.
233 */
ffe60014 234static void free_relayd_rcu(struct rcu_head *head)
00e2e675 235{
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236 struct lttng_ht_node_u64 *node =
237 caa_container_of(head, struct lttng_ht_node_u64, head);
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238 struct consumer_relayd_sock_pair *relayd =
239 caa_container_of(node, struct consumer_relayd_sock_pair, node);
240
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241 /*
242 * Close all sockets. This is done in the call RCU since we don't want the
243 * socket fds to be reassigned thus potentially creating bad state of the
244 * relayd object.
245 *
246 * We do not have to lock the control socket mutex here since at this stage
247 * there is no one referencing to this relayd object.
248 */
249 (void) relayd_close(&relayd->control_sock);
250 (void) relayd_close(&relayd->data_sock);
251
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252 free(relayd);
253}
254
255/*
256 * Destroy and free relayd socket pair object.
257 *
258 * This function MUST be called with the consumer_data lock acquired.
259 */
d09e1200 260static void destroy_relayd(struct consumer_relayd_sock_pair *relayd)
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261{
262 int ret;
263 struct lttng_ht_iter iter;
264
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265 if (relayd == NULL) {
266 return;
267 }
268
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269 DBG("Consumer destroy and close relayd socket pair");
270
271 iter.iter.node = &relayd->node.node;
272 ret = lttng_ht_del(consumer_data.relayd_ht, &iter);
173af62f 273 if (ret != 0) {
8994307f 274 /* We assume the relayd is being or is destroyed */
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275 return;
276 }
00e2e675 277
00e2e675 278 /* RCU free() call */
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279 call_rcu(&relayd->node.head, free_relayd_rcu);
280}
281
282/*
283 * Remove a channel from the global list protected by a mutex. This function is
284 * also responsible for freeing its data structures.
285 */
286void consumer_del_channel(struct lttng_consumer_channel *channel)
287{
288 int ret;
289 struct lttng_ht_iter iter;
f2a444f1 290 struct lttng_consumer_stream *stream, *stmp;
ffe60014 291
d88aee68 292 DBG("Consumer delete channel key %" PRIu64, channel->key);
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293
294 pthread_mutex_lock(&consumer_data.lock);
295
296 switch (consumer_data.type) {
297 case LTTNG_CONSUMER_KERNEL:
298 break;
299 case LTTNG_CONSUMER32_UST:
300 case LTTNG_CONSUMER64_UST:
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301 /* Delete streams that might have been left in the stream list. */
302 cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head,
303 send_node) {
304 cds_list_del(&stream->send_node);
305 lttng_ustconsumer_del_stream(stream);
306 free(stream);
307 }
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308 lttng_ustconsumer_del_channel(channel);
309 break;
310 default:
311 ERR("Unknown consumer_data type");
312 assert(0);
313 goto end;
314 }
315
316 rcu_read_lock();
317 iter.iter.node = &channel->node.node;
318 ret = lttng_ht_del(consumer_data.channel_ht, &iter);
319 assert(!ret);
320 rcu_read_unlock();
321
322 call_rcu(&channel->node.head, free_channel_rcu);
323end:
324 pthread_mutex_unlock(&consumer_data.lock);
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325}
326
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327/*
328 * Iterate over the relayd hash table and destroy each element. Finally,
329 * destroy the whole hash table.
330 */
331static void cleanup_relayd_ht(void)
332{
333 struct lttng_ht_iter iter;
334 struct consumer_relayd_sock_pair *relayd;
335
336 rcu_read_lock();
337
338 cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd,
339 node.node) {
340 destroy_relayd(relayd);
341 }
342
228b5bf7 343 rcu_read_unlock();
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344
345 lttng_ht_destroy(consumer_data.relayd_ht);
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346}
347
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348/*
349 * Update the end point status of all streams having the given network sequence
350 * index (relayd index).
351 *
352 * It's atomically set without having the stream mutex locked which is fine
353 * because we handle the write/read race with a pipe wakeup for each thread.
354 */
355static void update_endpoint_status_by_netidx(int net_seq_idx,
356 enum consumer_endpoint_status status)
357{
358 struct lttng_ht_iter iter;
359 struct lttng_consumer_stream *stream;
360
361 DBG("Consumer set delete flag on stream by idx %d", net_seq_idx);
362
363 rcu_read_lock();
364
365 /* Let's begin with metadata */
366 cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) {
367 if (stream->net_seq_idx == net_seq_idx) {
368 uatomic_set(&stream->endpoint_status, status);
369 DBG("Delete flag set to metadata stream %d", stream->wait_fd);
370 }
371 }
372
373 /* Follow up by the data streams */
374 cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) {
375 if (stream->net_seq_idx == net_seq_idx) {
376 uatomic_set(&stream->endpoint_status, status);
377 DBG("Delete flag set to data stream %d", stream->wait_fd);
378 }
379 }
380 rcu_read_unlock();
381}
382
383/*
384 * Cleanup a relayd object by flagging every associated streams for deletion,
385 * destroying the object meaning removing it from the relayd hash table,
386 * closing the sockets and freeing the memory in a RCU call.
387 *
388 * If a local data context is available, notify the threads that the streams'
389 * state have changed.
390 */
391static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd,
392 struct lttng_consumer_local_data *ctx)
393{
394 int netidx;
395
396 assert(relayd);
397
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398 DBG("Cleaning up relayd sockets");
399
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400 /* Save the net sequence index before destroying the object */
401 netidx = relayd->net_seq_idx;
402
403 /*
404 * Delete the relayd from the relayd hash table, close the sockets and free
405 * the object in a RCU call.
406 */
407 destroy_relayd(relayd);
408
409 /* Set inactive endpoint to all streams */
410 update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE);
411
412 /*
413 * With a local data context, notify the threads that the streams' state
414 * have changed. The write() action on the pipe acts as an "implicit"
415 * memory barrier ordering the updates of the end point status from the
416 * read of this status which happens AFTER receiving this notify.
417 */
418 if (ctx) {
acdb9057 419 notify_thread_lttng_pipe(ctx->consumer_data_pipe);
13886d2d 420 notify_thread_lttng_pipe(ctx->consumer_metadata_pipe);
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421 }
422}
423
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424/*
425 * Flag a relayd socket pair for destruction. Destroy it if the refcount
426 * reaches zero.
427 *
428 * RCU read side lock MUST be aquired before calling this function.
429 */
430void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd)
431{
432 assert(relayd);
433
434 /* Set destroy flag for this object */
435 uatomic_set(&relayd->destroy_flag, 1);
436
437 /* Destroy the relayd if refcount is 0 */
438 if (uatomic_read(&relayd->refcount) == 0) {
d09e1200 439 destroy_relayd(relayd);
a6ba4fe1
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440 }
441}
442
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443/*
444 * Remove a stream from the global list protected by a mutex. This
445 * function is also responsible for freeing its data structures.
446 */
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447void consumer_del_stream(struct lttng_consumer_stream *stream,
448 struct lttng_ht *ht)
3bd1e081
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449{
450 int ret;
e4421fec 451 struct lttng_ht_iter iter;
3bd1e081 452 struct lttng_consumer_channel *free_chan = NULL;
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453 struct consumer_relayd_sock_pair *relayd;
454
455 assert(stream);
3bd1e081 456
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457 DBG("Consumer del stream %d", stream->wait_fd);
458
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459 if (ht == NULL) {
460 /* Means the stream was allocated but not successfully added */
ffe60014 461 goto free_stream_rcu;
e316aad5
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462 }
463
3bd1e081 464 pthread_mutex_lock(&consumer_data.lock);
74251bb8 465 pthread_mutex_lock(&stream->lock);
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466
467 switch (consumer_data.type) {
468 case LTTNG_CONSUMER_KERNEL:
469 if (stream->mmap_base != NULL) {
470 ret = munmap(stream->mmap_base, stream->mmap_len);
471 if (ret != 0) {
7a57cf92 472 PERROR("munmap");
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473 }
474 }
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475
476 if (stream->wait_fd >= 0) {
477 ret = close(stream->wait_fd);
478 if (ret) {
479 PERROR("close");
480 }
481 }
3bd1e081 482 break;
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483 case LTTNG_CONSUMER32_UST:
484 case LTTNG_CONSUMER64_UST:
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485 lttng_ustconsumer_del_stream(stream);
486 break;
487 default:
488 ERR("Unknown consumer_data type");
489 assert(0);
490 goto end;
491 }
492
6065ceec 493 rcu_read_lock();
04253271 494 iter.iter.node = &stream->node.node;
e316aad5 495 ret = lttng_ht_del(ht, &iter);
04253271 496 assert(!ret);
ca22feea 497
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498 iter.iter.node = &stream->node_channel_id.node;
499 ret = lttng_ht_del(consumer_data.stream_per_chan_id_ht, &iter);
500 assert(!ret);
501
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502 iter.iter.node = &stream->node_session_id.node;
503 ret = lttng_ht_del(consumer_data.stream_list_ht, &iter);
504 assert(!ret);
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505 rcu_read_unlock();
506
50f8ae69 507 assert(consumer_data.stream_count > 0);
3bd1e081 508 consumer_data.stream_count--;
50f8ae69 509
3bd1e081 510 if (stream->out_fd >= 0) {
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511 ret = close(stream->out_fd);
512 if (ret) {
513 PERROR("close");
514 }
3bd1e081 515 }
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516
517 /* Check and cleanup relayd */
b0b335c8 518 rcu_read_lock();
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519 relayd = consumer_find_relayd(stream->net_seq_idx);
520 if (relayd != NULL) {
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521 uatomic_dec(&relayd->refcount);
522 assert(uatomic_read(&relayd->refcount) >= 0);
173af62f 523
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524 /* Closing streams requires to lock the control socket. */
525 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
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526 ret = relayd_send_close_stream(&relayd->control_sock,
527 stream->relayd_stream_id,
528 stream->next_net_seq_num - 1);
3f8e211f 529 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
173af62f 530 if (ret < 0) {
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531 DBG("Unable to close stream on the relayd. Continuing");
532 /*
533 * Continue here. There is nothing we can do for the relayd.
534 * Chances are that the relayd has closed the socket so we just
535 * continue cleaning up.
536 */
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537 }
538
539 /* Both conditions are met, we destroy the relayd. */
540 if (uatomic_read(&relayd->refcount) == 0 &&
541 uatomic_read(&relayd->destroy_flag)) {
d09e1200 542 destroy_relayd(relayd);
00e2e675 543 }
00e2e675 544 }
b0b335c8 545 rcu_read_unlock();
00e2e675 546
f2ad556d 547 if (!uatomic_sub_return(&stream->chan->refcount, 1)
ffe60014 548 && !uatomic_read(&stream->chan->nb_init_stream_left)) {
3bd1e081 549 free_chan = stream->chan;
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550 }
551
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552end:
553 consumer_data.need_update = 1;
8994307f 554 pthread_mutex_unlock(&stream->lock);
74251bb8 555 pthread_mutex_unlock(&consumer_data.lock);
3bd1e081 556
c30aaa51 557 if (free_chan) {
3bd1e081 558 consumer_del_channel(free_chan);
c30aaa51 559 }
e316aad5 560
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561free_stream_rcu:
562 call_rcu(&stream->node.head, free_stream_rcu);
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563}
564
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565struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key,
566 uint64_t stream_key,
3bd1e081 567 enum lttng_consumer_stream_state state,
ffe60014 568 const char *channel_name,
6df2e2c9 569 uid_t uid,
00e2e675 570 gid_t gid,
ffe60014 571 int relayd_id,
53632229 572 uint64_t session_id,
ffe60014
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573 int cpu,
574 int *alloc_ret,
575 enum consumer_channel_type type)
3bd1e081 576{
ffe60014 577 int ret;
3bd1e081 578 struct lttng_consumer_stream *stream;
3bd1e081 579
effcf122 580 stream = zmalloc(sizeof(*stream));
3bd1e081 581 if (stream == NULL) {
7a57cf92 582 PERROR("malloc struct lttng_consumer_stream");
ffe60014 583 ret = -ENOMEM;
7a57cf92 584 goto end;
3bd1e081 585 }
7a57cf92 586
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587 rcu_read_lock();
588
3bd1e081 589 stream->key = stream_key;
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590 stream->out_fd = -1;
591 stream->out_fd_offset = 0;
592 stream->state = state;
6df2e2c9
MD
593 stream->uid = uid;
594 stream->gid = gid;
ffe60014 595 stream->net_seq_idx = relayd_id;
53632229 596 stream->session_id = session_id;
53632229 597 pthread_mutex_init(&stream->lock, NULL);
58b1f425 598
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599 /* If channel is the metadata, flag this stream as metadata. */
600 if (type == CONSUMER_CHANNEL_TYPE_METADATA) {
601 stream->metadata_flag = 1;
602 /* Metadata is flat out. */
603 strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name));
58b1f425 604 } else {
ffe60014
DG
605 /* Format stream name to <channel_name>_<cpu_number> */
606 ret = snprintf(stream->name, sizeof(stream->name), "%s_%d",
607 channel_name, cpu);
608 if (ret < 0) {
609 PERROR("snprintf stream name");
610 goto error;
611 }
58b1f425 612 }
c30aaa51 613
ffe60014 614 /* Key is always the wait_fd for streams. */
d88aee68 615 lttng_ht_node_init_u64(&stream->node, stream->key);
ffe60014 616
d8ef542d
MD
617 /* Init node per channel id key */
618 lttng_ht_node_init_u64(&stream->node_channel_id, channel_key);
619
53632229 620 /* Init session id node with the stream session id */
d88aee68 621 lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id);
53632229 622
d8ef542d
MD
623 DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64 " relayd_id %" PRIu64 ", session_id %" PRIu64,
624 stream->name, stream->key, channel_key, stream->net_seq_idx, stream->session_id);
d56db448
DG
625
626 rcu_read_unlock();
3bd1e081 627 return stream;
c80048c6
MD
628
629error:
d56db448 630 rcu_read_unlock();
c80048c6 631 free(stream);
7a57cf92 632end:
ffe60014
DG
633 if (alloc_ret) {
634 *alloc_ret = ret;
635 }
c80048c6 636 return NULL;
3bd1e081
MD
637}
638
639/*
640 * Add a stream to the global list protected by a mutex.
641 */
ffe60014 642static int add_stream(struct lttng_consumer_stream *stream,
43c34bc3 643 struct lttng_ht *ht)
3bd1e081
MD
644{
645 int ret = 0;
00e2e675 646 struct consumer_relayd_sock_pair *relayd;
3bd1e081 647
e316aad5 648 assert(stream);
43c34bc3 649 assert(ht);
c77fc10a 650
d88aee68 651 DBG3("Adding consumer stream %" PRIu64, stream->key);
e316aad5
DG
652
653 pthread_mutex_lock(&consumer_data.lock);
2e818a6a 654 pthread_mutex_lock(&stream->lock);
b0b335c8 655 rcu_read_lock();
e316aad5 656
43c34bc3 657 /* Steal stream identifier to avoid having streams with the same key */
ffe60014 658 steal_stream_key(stream->key, ht);
43c34bc3 659
d88aee68 660 lttng_ht_add_unique_u64(ht, &stream->node);
00e2e675 661
d8ef542d
MD
662 lttng_ht_add_u64(consumer_data.stream_per_chan_id_ht,
663 &stream->node_channel_id);
664
ca22feea
DG
665 /*
666 * Add stream to the stream_list_ht of the consumer data. No need to steal
667 * the key since the HT does not use it and we allow to add redundant keys
668 * into this table.
669 */
d88aee68 670 lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id);
ca22feea 671
00e2e675
DG
672 /* Check and cleanup relayd */
673 relayd = consumer_find_relayd(stream->net_seq_idx);
674 if (relayd != NULL) {
b0b335c8 675 uatomic_inc(&relayd->refcount);
00e2e675
DG
676 }
677
e316aad5 678 /*
ffe60014
DG
679 * When nb_init_stream_left reaches 0, we don't need to trigger any action
680 * in terms of destroying the associated channel, because the action that
e316aad5
DG
681 * causes the count to become 0 also causes a stream to be added. The
682 * channel deletion will thus be triggered by the following removal of this
683 * stream.
684 */
ffe60014 685 if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) {
f2ad556d
MD
686 /* Increment refcount before decrementing nb_init_stream_left */
687 cmm_smp_wmb();
ffe60014 688 uatomic_dec(&stream->chan->nb_init_stream_left);
e316aad5
DG
689 }
690
691 /* Update consumer data once the node is inserted. */
3bd1e081
MD
692 consumer_data.stream_count++;
693 consumer_data.need_update = 1;
694
e316aad5 695 rcu_read_unlock();
2e818a6a 696 pthread_mutex_unlock(&stream->lock);
3bd1e081 697 pthread_mutex_unlock(&consumer_data.lock);
702b1ea4 698
3bd1e081
MD
699 return ret;
700}
701
00e2e675 702/*
3f8e211f
DG
703 * Add relayd socket to global consumer data hashtable. RCU read side lock MUST
704 * be acquired before calling this.
00e2e675 705 */
d09e1200 706static int add_relayd(struct consumer_relayd_sock_pair *relayd)
00e2e675
DG
707{
708 int ret = 0;
d88aee68 709 struct lttng_ht_node_u64 *node;
00e2e675
DG
710 struct lttng_ht_iter iter;
711
ffe60014 712 assert(relayd);
00e2e675 713
00e2e675 714 lttng_ht_lookup(consumer_data.relayd_ht,
d88aee68
DG
715 &relayd->net_seq_idx, &iter);
716 node = lttng_ht_iter_get_node_u64(&iter);
00e2e675 717 if (node != NULL) {
00e2e675
DG
718 goto end;
719 }
d88aee68 720 lttng_ht_add_unique_u64(consumer_data.relayd_ht, &relayd->node);
00e2e675 721
00e2e675
DG
722end:
723 return ret;
724}
725
726/*
727 * Allocate and return a consumer relayd socket.
728 */
729struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair(
730 int net_seq_idx)
731{
732 struct consumer_relayd_sock_pair *obj = NULL;
733
734 /* Negative net sequence index is a failure */
735 if (net_seq_idx < 0) {
736 goto error;
737 }
738
739 obj = zmalloc(sizeof(struct consumer_relayd_sock_pair));
740 if (obj == NULL) {
741 PERROR("zmalloc relayd sock");
742 goto error;
743 }
744
745 obj->net_seq_idx = net_seq_idx;
746 obj->refcount = 0;
173af62f 747 obj->destroy_flag = 0;
f96e4545
MD
748 obj->control_sock.sock.fd = -1;
749 obj->data_sock.sock.fd = -1;
d88aee68 750 lttng_ht_node_init_u64(&obj->node, obj->net_seq_idx);
00e2e675
DG
751 pthread_mutex_init(&obj->ctrl_sock_mutex, NULL);
752
753error:
754 return obj;
755}
756
757/*
758 * Find a relayd socket pair in the global consumer data.
759 *
760 * Return the object if found else NULL.
b0b335c8
MD
761 * RCU read-side lock must be held across this call and while using the
762 * returned object.
00e2e675 763 */
d88aee68 764struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key)
00e2e675
DG
765{
766 struct lttng_ht_iter iter;
d88aee68 767 struct lttng_ht_node_u64 *node;
00e2e675
DG
768 struct consumer_relayd_sock_pair *relayd = NULL;
769
770 /* Negative keys are lookup failures */
d88aee68 771 if (key == (uint64_t) -1ULL) {
00e2e675
DG
772 goto error;
773 }
774
d88aee68 775 lttng_ht_lookup(consumer_data.relayd_ht, &key,
00e2e675 776 &iter);
d88aee68 777 node = lttng_ht_iter_get_node_u64(&iter);
00e2e675
DG
778 if (node != NULL) {
779 relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node);
780 }
781
00e2e675
DG
782error:
783 return relayd;
784}
785
786/*
787 * Handle stream for relayd transmission if the stream applies for network
788 * streaming where the net sequence index is set.
789 *
790 * Return destination file descriptor or negative value on error.
791 */
6197aea7 792static int write_relayd_stream_header(struct lttng_consumer_stream *stream,
1d4dfdef
DG
793 size_t data_size, unsigned long padding,
794 struct consumer_relayd_sock_pair *relayd)
00e2e675
DG
795{
796 int outfd = -1, ret;
00e2e675
DG
797 struct lttcomm_relayd_data_hdr data_hdr;
798
799 /* Safety net */
800 assert(stream);
6197aea7 801 assert(relayd);
00e2e675
DG
802
803 /* Reset data header */
804 memset(&data_hdr, 0, sizeof(data_hdr));
805
00e2e675
DG
806 if (stream->metadata_flag) {
807 /* Caller MUST acquire the relayd control socket lock */
808 ret = relayd_send_metadata(&relayd->control_sock, data_size);
809 if (ret < 0) {
810 goto error;
811 }
812
813 /* Metadata are always sent on the control socket. */
6151a90f 814 outfd = relayd->control_sock.sock.fd;
00e2e675
DG
815 } else {
816 /* Set header with stream information */
817 data_hdr.stream_id = htobe64(stream->relayd_stream_id);
818 data_hdr.data_size = htobe32(data_size);
1d4dfdef 819 data_hdr.padding_size = htobe32(padding);
39df6d9f
DG
820 /*
821 * Note that net_seq_num below is assigned with the *current* value of
822 * next_net_seq_num and only after that the next_net_seq_num will be
823 * increment. This is why when issuing a command on the relayd using
824 * this next value, 1 should always be substracted in order to compare
825 * the last seen sequence number on the relayd side to the last sent.
826 */
3604f373 827 data_hdr.net_seq_num = htobe64(stream->next_net_seq_num);
00e2e675
DG
828 /* Other fields are zeroed previously */
829
830 ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr,
831 sizeof(data_hdr));
832 if (ret < 0) {
833 goto error;
834 }
835
3604f373
DG
836 ++stream->next_net_seq_num;
837
00e2e675 838 /* Set to go on data socket */
6151a90f 839 outfd = relayd->data_sock.sock.fd;
00e2e675
DG
840 }
841
842error:
843 return outfd;
844}
845
3bd1e081 846/*
ffe60014
DG
847 * Allocate and return a new lttng_consumer_channel object using the given key
848 * to initialize the hash table node.
849 *
850 * On error, return NULL.
3bd1e081 851 */
886224ff 852struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key,
ffe60014
DG
853 uint64_t session_id,
854 const char *pathname,
855 const char *name,
856 uid_t uid,
857 gid_t gid,
858 int relayd_id,
1624d5b7
JD
859 enum lttng_event_output output,
860 uint64_t tracefile_size,
861 uint64_t tracefile_count)
3bd1e081
MD
862{
863 struct lttng_consumer_channel *channel;
3bd1e081 864
276b26d1 865 channel = zmalloc(sizeof(*channel));
3bd1e081 866 if (channel == NULL) {
7a57cf92 867 PERROR("malloc struct lttng_consumer_channel");
3bd1e081
MD
868 goto end;
869 }
ffe60014
DG
870
871 channel->key = key;
3bd1e081 872 channel->refcount = 0;
ffe60014
DG
873 channel->session_id = session_id;
874 channel->uid = uid;
875 channel->gid = gid;
876 channel->relayd_id = relayd_id;
877 channel->output = output;
1624d5b7
JD
878 channel->tracefile_size = tracefile_size;
879 channel->tracefile_count = tracefile_count;
ffe60014
DG
880
881 strncpy(channel->pathname, pathname, sizeof(channel->pathname));
882 channel->pathname[sizeof(channel->pathname) - 1] = '\0';
883
884 strncpy(channel->name, name, sizeof(channel->name));
885 channel->name[sizeof(channel->name) - 1] = '\0';
886
d88aee68 887 lttng_ht_node_init_u64(&channel->node, channel->key);
d8ef542d
MD
888
889 channel->wait_fd = -1;
890
ffe60014
DG
891 CDS_INIT_LIST_HEAD(&channel->streams.head);
892
d88aee68 893 DBG("Allocated channel (key %" PRIu64 ")", channel->key)
3bd1e081 894
3bd1e081
MD
895end:
896 return channel;
897}
898
899/*
900 * Add a channel to the global list protected by a mutex.
821fffb2
DG
901 *
902 * On success 0 is returned else a negative value.
3bd1e081 903 */
d8ef542d
MD
904int consumer_add_channel(struct lttng_consumer_channel *channel,
905 struct lttng_consumer_local_data *ctx)
3bd1e081 906{
ffe60014 907 int ret = 0;
d88aee68 908 struct lttng_ht_node_u64 *node;
c77fc10a
DG
909 struct lttng_ht_iter iter;
910
3bd1e081 911 pthread_mutex_lock(&consumer_data.lock);
6065ceec 912 rcu_read_lock();
c77fc10a 913
7972aab2 914 lttng_ht_lookup(consumer_data.channel_ht, &channel->key, &iter);
d88aee68 915 node = lttng_ht_iter_get_node_u64(&iter);
c77fc10a
DG
916 if (node != NULL) {
917 /* Channel already exist. Ignore the insertion */
d88aee68
DG
918 ERR("Consumer add channel key %" PRIu64 " already exists!",
919 channel->key);
821fffb2 920 ret = -EEXIST;
c77fc10a
DG
921 goto end;
922 }
923
d88aee68 924 lttng_ht_add_unique_u64(consumer_data.channel_ht, &channel->node);
c77fc10a
DG
925
926end:
6065ceec 927 rcu_read_unlock();
3bd1e081 928 pthread_mutex_unlock(&consumer_data.lock);
702b1ea4 929
d8ef542d
MD
930 if (!ret && channel->wait_fd != -1 &&
931 channel->metadata_stream == NULL) {
a0cbdd2e 932 notify_channel_pipe(ctx, channel, -1, CONSUMER_CHANNEL_ADD);
d8ef542d 933 }
ffe60014 934 return ret;
3bd1e081
MD
935}
936
937/*
938 * Allocate the pollfd structure and the local view of the out fds to avoid
939 * doing a lookup in the linked list and concurrency issues when writing is
940 * needed. Called with consumer_data.lock held.
941 *
942 * Returns the number of fds in the structures.
943 */
ffe60014
DG
944static int update_poll_array(struct lttng_consumer_local_data *ctx,
945 struct pollfd **pollfd, struct lttng_consumer_stream **local_stream,
946 struct lttng_ht *ht)
3bd1e081 947{
3bd1e081 948 int i = 0;
e4421fec
DG
949 struct lttng_ht_iter iter;
950 struct lttng_consumer_stream *stream;
3bd1e081 951
ffe60014
DG
952 assert(ctx);
953 assert(ht);
954 assert(pollfd);
955 assert(local_stream);
956
3bd1e081 957 DBG("Updating poll fd array");
481d6c57 958 rcu_read_lock();
43c34bc3 959 cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) {
8994307f
DG
960 /*
961 * Only active streams with an active end point can be added to the
962 * poll set and local stream storage of the thread.
963 *
964 * There is a potential race here for endpoint_status to be updated
965 * just after the check. However, this is OK since the stream(s) will
966 * be deleted once the thread is notified that the end point state has
967 * changed where this function will be called back again.
968 */
969 if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM ||
79d4ffb7 970 stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) {
3bd1e081
MD
971 continue;
972 }
7972aab2
DG
973 /*
974 * This clobbers way too much the debug output. Uncomment that if you
975 * need it for debugging purposes.
976 *
977 * DBG("Active FD %d", stream->wait_fd);
978 */
e4421fec 979 (*pollfd)[i].fd = stream->wait_fd;
3bd1e081 980 (*pollfd)[i].events = POLLIN | POLLPRI;
e4421fec 981 local_stream[i] = stream;
3bd1e081
MD
982 i++;
983 }
481d6c57 984 rcu_read_unlock();
3bd1e081
MD
985
986 /*
50f8ae69 987 * Insert the consumer_data_pipe at the end of the array and don't
3bd1e081
MD
988 * increment i so nb_fd is the number of real FD.
989 */
acdb9057 990 (*pollfd)[i].fd = lttng_pipe_get_readfd(ctx->consumer_data_pipe);
509bb1cf 991 (*pollfd)[i].events = POLLIN | POLLPRI;
3bd1e081
MD
992 return i;
993}
994
995/*
996 * Poll on the should_quit pipe and the command socket return -1 on error and
997 * should exit, 0 if data is available on the command socket
998 */
999int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll)
1000{
1001 int num_rdy;
1002
88f2b785 1003restart:
3bd1e081
MD
1004 num_rdy = poll(consumer_sockpoll, 2, -1);
1005 if (num_rdy == -1) {
88f2b785
MD
1006 /*
1007 * Restart interrupted system call.
1008 */
1009 if (errno == EINTR) {
1010 goto restart;
1011 }
7a57cf92 1012 PERROR("Poll error");
3bd1e081
MD
1013 goto exit;
1014 }
509bb1cf 1015 if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) {
3bd1e081
MD
1016 DBG("consumer_should_quit wake up");
1017 goto exit;
1018 }
1019 return 0;
1020
1021exit:
1022 return -1;
1023}
1024
1025/*
1026 * Set the error socket.
1027 */
ffe60014
DG
1028void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx,
1029 int sock)
3bd1e081
MD
1030{
1031 ctx->consumer_error_socket = sock;
1032}
1033
1034/*
1035 * Set the command socket path.
1036 */
3bd1e081
MD
1037void lttng_consumer_set_command_sock_path(
1038 struct lttng_consumer_local_data *ctx, char *sock)
1039{
1040 ctx->consumer_command_sock_path = sock;
1041}
1042
1043/*
1044 * Send return code to the session daemon.
1045 * If the socket is not defined, we return 0, it is not a fatal error
1046 */
ffe60014 1047int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd)
3bd1e081
MD
1048{
1049 if (ctx->consumer_error_socket > 0) {
1050 return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd,
1051 sizeof(enum lttcomm_sessiond_command));
1052 }
1053
1054 return 0;
1055}
1056
1057/*
228b5bf7
DG
1058 * Close all the tracefiles and stream fds and MUST be called when all
1059 * instances are destroyed i.e. when all threads were joined and are ended.
3bd1e081
MD
1060 */
1061void lttng_consumer_cleanup(void)
1062{
e4421fec 1063 struct lttng_ht_iter iter;
ffe60014 1064 struct lttng_consumer_channel *channel;
6065ceec
DG
1065
1066 rcu_read_lock();
3bd1e081 1067
ffe60014
DG
1068 cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, channel,
1069 node.node) {
702b1ea4 1070 consumer_del_channel(channel);
3bd1e081 1071 }
6065ceec
DG
1072
1073 rcu_read_unlock();
d6ce1df2 1074
d6ce1df2 1075 lttng_ht_destroy(consumer_data.channel_ht);
228b5bf7
DG
1076
1077 cleanup_relayd_ht();
1078
d8ef542d
MD
1079 lttng_ht_destroy(consumer_data.stream_per_chan_id_ht);
1080
228b5bf7
DG
1081 /*
1082 * This HT contains streams that are freed by either the metadata thread or
1083 * the data thread so we do *nothing* on the hash table and simply destroy
1084 * it.
1085 */
1086 lttng_ht_destroy(consumer_data.stream_list_ht);
3bd1e081
MD
1087}
1088
1089/*
1090 * Called from signal handler.
1091 */
1092void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx)
1093{
1094 int ret;
1095 consumer_quit = 1;
6f94560a
MD
1096 do {
1097 ret = write(ctx->consumer_should_quit[1], "4", 1);
1098 } while (ret < 0 && errno == EINTR);
4cec016f 1099 if (ret < 0 || ret != 1) {
7a57cf92 1100 PERROR("write consumer quit");
3bd1e081 1101 }
ab1027f4
DG
1102
1103 DBG("Consumer flag that it should quit");
3bd1e081
MD
1104}
1105
00e2e675
DG
1106void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream,
1107 off_t orig_offset)
3bd1e081
MD
1108{
1109 int outfd = stream->out_fd;
1110
1111 /*
1112 * This does a blocking write-and-wait on any page that belongs to the
1113 * subbuffer prior to the one we just wrote.
1114 * Don't care about error values, as these are just hints and ways to
1115 * limit the amount of page cache used.
1116 */
ffe60014 1117 if (orig_offset < stream->max_sb_size) {
3bd1e081
MD
1118 return;
1119 }
ffe60014
DG
1120 lttng_sync_file_range(outfd, orig_offset - stream->max_sb_size,
1121 stream->max_sb_size,
3bd1e081
MD
1122 SYNC_FILE_RANGE_WAIT_BEFORE
1123 | SYNC_FILE_RANGE_WRITE
1124 | SYNC_FILE_RANGE_WAIT_AFTER);
1125 /*
1126 * Give hints to the kernel about how we access the file:
1127 * POSIX_FADV_DONTNEED : we won't re-access data in a near future after
1128 * we write it.
1129 *
1130 * We need to call fadvise again after the file grows because the
1131 * kernel does not seem to apply fadvise to non-existing parts of the
1132 * file.
1133 *
1134 * Call fadvise _after_ having waited for the page writeback to
1135 * complete because the dirty page writeback semantic is not well
1136 * defined. So it can be expected to lead to lower throughput in
1137 * streaming.
1138 */
ffe60014
DG
1139 posix_fadvise(outfd, orig_offset - stream->max_sb_size,
1140 stream->max_sb_size, POSIX_FADV_DONTNEED);
3bd1e081
MD
1141}
1142
1143/*
1144 * Initialise the necessary environnement :
1145 * - create a new context
1146 * - create the poll_pipe
1147 * - create the should_quit pipe (for signal handler)
1148 * - create the thread pipe (for splice)
1149 *
1150 * Takes a function pointer as argument, this function is called when data is
1151 * available on a buffer. This function is responsible to do the
1152 * kernctl_get_next_subbuf, read the data with mmap or splice depending on the
1153 * buffer configuration and then kernctl_put_next_subbuf at the end.
1154 *
1155 * Returns a pointer to the new context or NULL on error.
1156 */
1157struct lttng_consumer_local_data *lttng_consumer_create(
1158 enum lttng_consumer_type type,
4078b776 1159 ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream,
d41f73b7 1160 struct lttng_consumer_local_data *ctx),
3bd1e081
MD
1161 int (*recv_channel)(struct lttng_consumer_channel *channel),
1162 int (*recv_stream)(struct lttng_consumer_stream *stream),
1163 int (*update_stream)(int stream_key, uint32_t state))
1164{
d8ef542d 1165 int ret;
3bd1e081
MD
1166 struct lttng_consumer_local_data *ctx;
1167
1168 assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN ||
1169 consumer_data.type == type);
1170 consumer_data.type = type;
1171
effcf122 1172 ctx = zmalloc(sizeof(struct lttng_consumer_local_data));
3bd1e081 1173 if (ctx == NULL) {
7a57cf92 1174 PERROR("allocating context");
3bd1e081
MD
1175 goto error;
1176 }
1177
1178 ctx->consumer_error_socket = -1;
331744e3 1179 ctx->consumer_metadata_socket = -1;
3bd1e081
MD
1180 /* assign the callbacks */
1181 ctx->on_buffer_ready = buffer_ready;
1182 ctx->on_recv_channel = recv_channel;
1183 ctx->on_recv_stream = recv_stream;
1184 ctx->on_update_stream = update_stream;
1185
acdb9057
DG
1186 ctx->consumer_data_pipe = lttng_pipe_open(0);
1187 if (!ctx->consumer_data_pipe) {
3bd1e081
MD
1188 goto error_poll_pipe;
1189 }
1190
1191 ret = pipe(ctx->consumer_should_quit);
1192 if (ret < 0) {
7a57cf92 1193 PERROR("Error creating recv pipe");
3bd1e081
MD
1194 goto error_quit_pipe;
1195 }
1196
1197 ret = pipe(ctx->consumer_thread_pipe);
1198 if (ret < 0) {
7a57cf92 1199 PERROR("Error creating thread pipe");
3bd1e081
MD
1200 goto error_thread_pipe;
1201 }
1202
d8ef542d
MD
1203 ret = pipe(ctx->consumer_channel_pipe);
1204 if (ret < 0) {
1205 PERROR("Error creating channel pipe");
1206 goto error_channel_pipe;
1207 }
1208
13886d2d
DG
1209 ctx->consumer_metadata_pipe = lttng_pipe_open(0);
1210 if (!ctx->consumer_metadata_pipe) {
fb3a43a9
DG
1211 goto error_metadata_pipe;
1212 }
3bd1e081 1213
fb3a43a9
DG
1214 ret = utils_create_pipe(ctx->consumer_splice_metadata_pipe);
1215 if (ret < 0) {
1216 goto error_splice_pipe;
1217 }
1218
1219 return ctx;
3bd1e081 1220
fb3a43a9 1221error_splice_pipe:
13886d2d 1222 lttng_pipe_destroy(ctx->consumer_metadata_pipe);
fb3a43a9 1223error_metadata_pipe:
d8ef542d
MD
1224 utils_close_pipe(ctx->consumer_channel_pipe);
1225error_channel_pipe:
fb3a43a9 1226 utils_close_pipe(ctx->consumer_thread_pipe);
3bd1e081 1227error_thread_pipe:
d8ef542d 1228 utils_close_pipe(ctx->consumer_should_quit);
3bd1e081 1229error_quit_pipe:
acdb9057 1230 lttng_pipe_destroy(ctx->consumer_data_pipe);
3bd1e081
MD
1231error_poll_pipe:
1232 free(ctx);
1233error:
1234 return NULL;
1235}
1236
1237/*
1238 * Close all fds associated with the instance and free the context.
1239 */
1240void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx)
1241{
4c462e79
MD
1242 int ret;
1243
ab1027f4
DG
1244 DBG("Consumer destroying it. Closing everything.");
1245
4c462e79
MD
1246 ret = close(ctx->consumer_error_socket);
1247 if (ret) {
1248 PERROR("close");
1249 }
331744e3
JD
1250 ret = close(ctx->consumer_metadata_socket);
1251 if (ret) {
1252 PERROR("close");
1253 }
d8ef542d
MD
1254 utils_close_pipe(ctx->consumer_thread_pipe);
1255 utils_close_pipe(ctx->consumer_channel_pipe);
acdb9057 1256 lttng_pipe_destroy(ctx->consumer_data_pipe);
13886d2d 1257 lttng_pipe_destroy(ctx->consumer_metadata_pipe);
d8ef542d 1258 utils_close_pipe(ctx->consumer_should_quit);
fb3a43a9
DG
1259 utils_close_pipe(ctx->consumer_splice_metadata_pipe);
1260
3bd1e081
MD
1261 unlink(ctx->consumer_command_sock_path);
1262 free(ctx);
1263}
1264
6197aea7
DG
1265/*
1266 * Write the metadata stream id on the specified file descriptor.
1267 */
1268static int write_relayd_metadata_id(int fd,
1269 struct lttng_consumer_stream *stream,
ffe60014 1270 struct consumer_relayd_sock_pair *relayd, unsigned long padding)
6197aea7
DG
1271{
1272 int ret;
1d4dfdef 1273 struct lttcomm_relayd_metadata_payload hdr;
6197aea7 1274
1d4dfdef
DG
1275 hdr.stream_id = htobe64(stream->relayd_stream_id);
1276 hdr.padding_size = htobe32(padding);
6197aea7 1277 do {
1d4dfdef 1278 ret = write(fd, (void *) &hdr, sizeof(hdr));
6197aea7 1279 } while (ret < 0 && errno == EINTR);
4cec016f 1280 if (ret < 0 || ret != sizeof(hdr)) {
d7b75ec8
DG
1281 /*
1282 * This error means that the fd's end is closed so ignore the perror
1283 * not to clubber the error output since this can happen in a normal
1284 * code path.
1285 */
1286 if (errno != EPIPE) {
1287 PERROR("write metadata stream id");
1288 }
1289 DBG3("Consumer failed to write relayd metadata id (errno: %d)", errno);
534d2592
DG
1290 /*
1291 * Set ret to a negative value because if ret != sizeof(hdr), we don't
1292 * handle writting the missing part so report that as an error and
1293 * don't lie to the caller.
1294 */
1295 ret = -1;
6197aea7
DG
1296 goto end;
1297 }
1d4dfdef
DG
1298 DBG("Metadata stream id %" PRIu64 " with padding %lu written before data",
1299 stream->relayd_stream_id, padding);
6197aea7
DG
1300
1301end:
1302 return ret;
1303}
1304
3bd1e081 1305/*
09e26845
DG
1306 * Mmap the ring buffer, read it and write the data to the tracefile. This is a
1307 * core function for writing trace buffers to either the local filesystem or
1308 * the network.
1309 *
79d4ffb7
DG
1310 * It must be called with the stream lock held.
1311 *
09e26845 1312 * Careful review MUST be put if any changes occur!
3bd1e081
MD
1313 *
1314 * Returns the number of bytes written
1315 */
4078b776 1316ssize_t lttng_consumer_on_read_subbuffer_mmap(
3bd1e081 1317 struct lttng_consumer_local_data *ctx,
1d4dfdef
DG
1318 struct lttng_consumer_stream *stream, unsigned long len,
1319 unsigned long padding)
3bd1e081 1320{
f02e1e8a 1321 unsigned long mmap_offset;
ffe60014 1322 void *mmap_base;
f02e1e8a
DG
1323 ssize_t ret = 0, written = 0;
1324 off_t orig_offset = stream->out_fd_offset;
1325 /* Default is on the disk */
1326 int outfd = stream->out_fd;
f02e1e8a 1327 struct consumer_relayd_sock_pair *relayd = NULL;
8994307f 1328 unsigned int relayd_hang_up = 0;
f02e1e8a
DG
1329
1330 /* RCU lock for the relayd pointer */
1331 rcu_read_lock();
1332
1333 /* Flag that the current stream if set for network streaming. */
1334 if (stream->net_seq_idx != -1) {
1335 relayd = consumer_find_relayd(stream->net_seq_idx);
1336 if (relayd == NULL) {
1337 goto end;
1338 }
1339 }
1340
1341 /* get the offset inside the fd to mmap */
3bd1e081
MD
1342 switch (consumer_data.type) {
1343 case LTTNG_CONSUMER_KERNEL:
ffe60014 1344 mmap_base = stream->mmap_base;
f02e1e8a
DG
1345 ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset);
1346 break;
7753dea8
MD
1347 case LTTNG_CONSUMER32_UST:
1348 case LTTNG_CONSUMER64_UST:
ffe60014
DG
1349 mmap_base = lttng_ustctl_get_mmap_base(stream);
1350 if (!mmap_base) {
1351 ERR("read mmap get mmap base for stream %s", stream->name);
1352 written = -1;
1353 goto end;
1354 }
1355 ret = lttng_ustctl_get_mmap_read_offset(stream, &mmap_offset);
331744e3 1356
f02e1e8a 1357 break;
3bd1e081
MD
1358 default:
1359 ERR("Unknown consumer_data type");
1360 assert(0);
1361 }
f02e1e8a
DG
1362 if (ret != 0) {
1363 errno = -ret;
1364 PERROR("tracer ctl get_mmap_read_offset");
1365 written = ret;
1366 goto end;
1367 }
b9182dd9 1368
f02e1e8a
DG
1369 /* Handle stream on the relayd if the output is on the network */
1370 if (relayd) {
1371 unsigned long netlen = len;
1372
1373 /*
1374 * Lock the control socket for the complete duration of the function
1375 * since from this point on we will use the socket.
1376 */
1377 if (stream->metadata_flag) {
1378 /* Metadata requires the control socket. */
1379 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
1d4dfdef 1380 netlen += sizeof(struct lttcomm_relayd_metadata_payload);
f02e1e8a
DG
1381 }
1382
1d4dfdef 1383 ret = write_relayd_stream_header(stream, netlen, padding, relayd);
f02e1e8a
DG
1384 if (ret >= 0) {
1385 /* Use the returned socket. */
1386 outfd = ret;
1387
1388 /* Write metadata stream id before payload */
1389 if (stream->metadata_flag) {
1d4dfdef 1390 ret = write_relayd_metadata_id(outfd, stream, relayd, padding);
f02e1e8a 1391 if (ret < 0) {
f02e1e8a 1392 written = ret;
8994307f
DG
1393 /* Socket operation failed. We consider the relayd dead */
1394 if (ret == -EPIPE || ret == -EINVAL) {
1395 relayd_hang_up = 1;
1396 goto write_error;
1397 }
f02e1e8a
DG
1398 goto end;
1399 }
f02e1e8a 1400 }
8994307f
DG
1401 } else {
1402 /* Socket operation failed. We consider the relayd dead */
1403 if (ret == -EPIPE || ret == -EINVAL) {
1404 relayd_hang_up = 1;
1405 goto write_error;
1406 }
1407 /* Else, use the default set before which is the filesystem. */
f02e1e8a 1408 }
1d4dfdef
DG
1409 } else {
1410 /* No streaming, we have to set the len with the full padding */
1411 len += padding;
1624d5b7
JD
1412
1413 /*
1414 * Check if we need to change the tracefile before writing the packet.
1415 */
1416 if (stream->chan->tracefile_size > 0 &&
1417 (stream->tracefile_size_current + len) >
1418 stream->chan->tracefile_size) {
fe4477ee
JD
1419 ret = utils_rotate_stream_file(stream->chan->pathname,
1420 stream->name, stream->chan->tracefile_size,
1421 stream->chan->tracefile_count, stream->uid, stream->gid,
1422 stream->out_fd, &(stream->tracefile_count_current));
1624d5b7
JD
1423 if (ret < 0) {
1424 ERR("Rotating output file");
1425 goto end;
1426 }
fe4477ee 1427 outfd = stream->out_fd = ret;
a6976990
DG
1428 /* Reset current size because we just perform a rotation. */
1429 stream->tracefile_size_current = 0;
1624d5b7
JD
1430 }
1431 stream->tracefile_size_current += len;
f02e1e8a
DG
1432 }
1433
1434 while (len > 0) {
1435 do {
ffe60014 1436 ret = write(outfd, mmap_base + mmap_offset, len);
f02e1e8a 1437 } while (ret < 0 && errno == EINTR);
1d4dfdef 1438 DBG("Consumer mmap write() ret %zd (len %lu)", ret, len);
f02e1e8a 1439 if (ret < 0) {
c5c45efa
DG
1440 /*
1441 * This is possible if the fd is closed on the other side (outfd)
1442 * or any write problem. It can be verbose a bit for a normal
1443 * execution if for instance the relayd is stopped abruptly. This
1444 * can happen so set this to a DBG statement.
1445 */
1446 DBG("Error in file write mmap");
f02e1e8a
DG
1447 if (written == 0) {
1448 written = ret;
1449 }
8994307f
DG
1450 /* Socket operation failed. We consider the relayd dead */
1451 if (errno == EPIPE || errno == EINVAL) {
1452 relayd_hang_up = 1;
1453 goto write_error;
1454 }
f02e1e8a
DG
1455 goto end;
1456 } else if (ret > len) {
77c7c900 1457 PERROR("Error in file write (ret %zd > len %lu)", ret, len);
f02e1e8a
DG
1458 written += ret;
1459 goto end;
1460 } else {
1461 len -= ret;
1462 mmap_offset += ret;
1463 }
f02e1e8a
DG
1464
1465 /* This call is useless on a socket so better save a syscall. */
1466 if (!relayd) {
1467 /* This won't block, but will start writeout asynchronously */
1468 lttng_sync_file_range(outfd, stream->out_fd_offset, ret,
1469 SYNC_FILE_RANGE_WRITE);
1470 stream->out_fd_offset += ret;
1471 }
1472 written += ret;
1473 }
1474 lttng_consumer_sync_trace_file(stream, orig_offset);
1475
8994307f
DG
1476write_error:
1477 /*
1478 * This is a special case that the relayd has closed its socket. Let's
1479 * cleanup the relayd object and all associated streams.
1480 */
1481 if (relayd && relayd_hang_up) {
1482 cleanup_relayd(relayd, ctx);
1483 }
1484
f02e1e8a
DG
1485end:
1486 /* Unlock only if ctrl socket used */
1487 if (relayd && stream->metadata_flag) {
1488 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
1489 }
1490
1491 rcu_read_unlock();
1492 return written;
3bd1e081
MD
1493}
1494
1495/*
1496 * Splice the data from the ring buffer to the tracefile.
1497 *
79d4ffb7
DG
1498 * It must be called with the stream lock held.
1499 *
3bd1e081
MD
1500 * Returns the number of bytes spliced.
1501 */
4078b776 1502ssize_t lttng_consumer_on_read_subbuffer_splice(
3bd1e081 1503 struct lttng_consumer_local_data *ctx,
1d4dfdef
DG
1504 struct lttng_consumer_stream *stream, unsigned long len,
1505 unsigned long padding)
3bd1e081 1506{
f02e1e8a
DG
1507 ssize_t ret = 0, written = 0, ret_splice = 0;
1508 loff_t offset = 0;
1509 off_t orig_offset = stream->out_fd_offset;
1510 int fd = stream->wait_fd;
1511 /* Default is on the disk */
1512 int outfd = stream->out_fd;
f02e1e8a 1513 struct consumer_relayd_sock_pair *relayd = NULL;
fb3a43a9 1514 int *splice_pipe;
8994307f 1515 unsigned int relayd_hang_up = 0;
f02e1e8a 1516
3bd1e081
MD
1517 switch (consumer_data.type) {
1518 case LTTNG_CONSUMER_KERNEL:
f02e1e8a 1519 break;
7753dea8
MD
1520 case LTTNG_CONSUMER32_UST:
1521 case LTTNG_CONSUMER64_UST:
f02e1e8a 1522 /* Not supported for user space tracing */
3bd1e081
MD
1523 return -ENOSYS;
1524 default:
1525 ERR("Unknown consumer_data type");
1526 assert(0);
3bd1e081
MD
1527 }
1528
f02e1e8a
DG
1529 /* RCU lock for the relayd pointer */
1530 rcu_read_lock();
1531
1532 /* Flag that the current stream if set for network streaming. */
1533 if (stream->net_seq_idx != -1) {
1534 relayd = consumer_find_relayd(stream->net_seq_idx);
1535 if (relayd == NULL) {
1536 goto end;
1537 }
1538 }
1539
fb3a43a9
DG
1540 /*
1541 * Choose right pipe for splice. Metadata and trace data are handled by
1542 * different threads hence the use of two pipes in order not to race or
1543 * corrupt the written data.
1544 */
1545 if (stream->metadata_flag) {
1546 splice_pipe = ctx->consumer_splice_metadata_pipe;
1547 } else {
1548 splice_pipe = ctx->consumer_thread_pipe;
1549 }
1550
f02e1e8a 1551 /* Write metadata stream id before payload */
1d4dfdef
DG
1552 if (relayd) {
1553 int total_len = len;
f02e1e8a 1554
1d4dfdef
DG
1555 if (stream->metadata_flag) {
1556 /*
1557 * Lock the control socket for the complete duration of the function
1558 * since from this point on we will use the socket.
1559 */
1560 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
1561
1562 ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd,
1563 padding);
1564 if (ret < 0) {
1565 written = ret;
8994307f
DG
1566 /* Socket operation failed. We consider the relayd dead */
1567 if (ret == -EBADF) {
1568 WARN("Remote relayd disconnected. Stopping");
1569 relayd_hang_up = 1;
1570 goto write_error;
1571 }
1d4dfdef
DG
1572 goto end;
1573 }
1574
1575 total_len += sizeof(struct lttcomm_relayd_metadata_payload);
1576 }
1577
1578 ret = write_relayd_stream_header(stream, total_len, padding, relayd);
1579 if (ret >= 0) {
1580 /* Use the returned socket. */
1581 outfd = ret;
1582 } else {
8994307f
DG
1583 /* Socket operation failed. We consider the relayd dead */
1584 if (ret == -EBADF) {
1585 WARN("Remote relayd disconnected. Stopping");
1586 relayd_hang_up = 1;
1587 goto write_error;
1588 }
f02e1e8a
DG
1589 goto end;
1590 }
1d4dfdef
DG
1591 } else {
1592 /* No streaming, we have to set the len with the full padding */
1593 len += padding;
1624d5b7
JD
1594
1595 /*
1596 * Check if we need to change the tracefile before writing the packet.
1597 */
1598 if (stream->chan->tracefile_size > 0 &&
1599 (stream->tracefile_size_current + len) >
1600 stream->chan->tracefile_size) {
fe4477ee
JD
1601 ret = utils_rotate_stream_file(stream->chan->pathname,
1602 stream->name, stream->chan->tracefile_size,
1603 stream->chan->tracefile_count, stream->uid, stream->gid,
1604 stream->out_fd, &(stream->tracefile_count_current));
1624d5b7
JD
1605 if (ret < 0) {
1606 ERR("Rotating output file");
1607 goto end;
1608 }
fe4477ee 1609 outfd = stream->out_fd = ret;
a6976990
DG
1610 /* Reset current size because we just perform a rotation. */
1611 stream->tracefile_size_current = 0;
1624d5b7
JD
1612 }
1613 stream->tracefile_size_current += len;
f02e1e8a
DG
1614 }
1615
1616 while (len > 0) {
1d4dfdef
DG
1617 DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)",
1618 (unsigned long)offset, len, fd, splice_pipe[1]);
fb3a43a9 1619 ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len,
f02e1e8a
DG
1620 SPLICE_F_MOVE | SPLICE_F_MORE);
1621 DBG("splice chan to pipe, ret %zd", ret_splice);
1622 if (ret_splice < 0) {
1623 PERROR("Error in relay splice");
1624 if (written == 0) {
1625 written = ret_splice;
1626 }
1627 ret = errno;
1628 goto splice_error;
1629 }
1630
1631 /* Handle stream on the relayd if the output is on the network */
1632 if (relayd) {
1633 if (stream->metadata_flag) {
1d4dfdef
DG
1634 size_t metadata_payload_size =
1635 sizeof(struct lttcomm_relayd_metadata_payload);
1636
f02e1e8a 1637 /* Update counter to fit the spliced data */
1d4dfdef
DG
1638 ret_splice += metadata_payload_size;
1639 len += metadata_payload_size;
f02e1e8a
DG
1640 /*
1641 * We do this so the return value can match the len passed as
1642 * argument to this function.
1643 */
1d4dfdef 1644 written -= metadata_payload_size;
f02e1e8a
DG
1645 }
1646 }
1647
1648 /* Splice data out */
fb3a43a9 1649 ret_splice = splice(splice_pipe[0], NULL, outfd, NULL,
f02e1e8a 1650 ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE);
1d4dfdef 1651 DBG("Consumer splice pipe to file, ret %zd", ret_splice);
f02e1e8a
DG
1652 if (ret_splice < 0) {
1653 PERROR("Error in file splice");
1654 if (written == 0) {
1655 written = ret_splice;
1656 }
8994307f 1657 /* Socket operation failed. We consider the relayd dead */
00c8752b 1658 if (errno == EBADF || errno == EPIPE) {
8994307f
DG
1659 WARN("Remote relayd disconnected. Stopping");
1660 relayd_hang_up = 1;
1661 goto write_error;
1662 }
f02e1e8a
DG
1663 ret = errno;
1664 goto splice_error;
1665 } else if (ret_splice > len) {
1666 errno = EINVAL;
1667 PERROR("Wrote more data than requested %zd (len: %lu)",
1668 ret_splice, len);
1669 written += ret_splice;
1670 ret = errno;
1671 goto splice_error;
1672 }
1673 len -= ret_splice;
1674
1675 /* This call is useless on a socket so better save a syscall. */
1676 if (!relayd) {
1677 /* This won't block, but will start writeout asynchronously */
1678 lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice,
1679 SYNC_FILE_RANGE_WRITE);
1680 stream->out_fd_offset += ret_splice;
1681 }
1682 written += ret_splice;
1683 }
1684 lttng_consumer_sync_trace_file(stream, orig_offset);
1685
1686 ret = ret_splice;
1687
1688 goto end;
1689
8994307f
DG
1690write_error:
1691 /*
1692 * This is a special case that the relayd has closed its socket. Let's
1693 * cleanup the relayd object and all associated streams.
1694 */
1695 if (relayd && relayd_hang_up) {
1696 cleanup_relayd(relayd, ctx);
1697 /* Skip splice error so the consumer does not fail */
1698 goto end;
1699 }
1700
f02e1e8a
DG
1701splice_error:
1702 /* send the appropriate error description to sessiond */
1703 switch (ret) {
f02e1e8a 1704 case EINVAL:
f73fabfd 1705 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL);
f02e1e8a
DG
1706 break;
1707 case ENOMEM:
f73fabfd 1708 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM);
f02e1e8a
DG
1709 break;
1710 case ESPIPE:
f73fabfd 1711 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE);
f02e1e8a
DG
1712 break;
1713 }
1714
1715end:
1716 if (relayd && stream->metadata_flag) {
1717 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
1718 }
1719
1720 rcu_read_unlock();
1721 return written;
3bd1e081
MD
1722}
1723
1724/*
1725 * Take a snapshot for a specific fd
1726 *
1727 * Returns 0 on success, < 0 on error
1728 */
ffe60014 1729int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream)
3bd1e081
MD
1730{
1731 switch (consumer_data.type) {
1732 case LTTNG_CONSUMER_KERNEL:
ffe60014 1733 return lttng_kconsumer_take_snapshot(stream);
7753dea8
MD
1734 case LTTNG_CONSUMER32_UST:
1735 case LTTNG_CONSUMER64_UST:
ffe60014 1736 return lttng_ustconsumer_take_snapshot(stream);
3bd1e081
MD
1737 default:
1738 ERR("Unknown consumer_data type");
1739 assert(0);
1740 return -ENOSYS;
1741 }
3bd1e081
MD
1742}
1743
1744/*
1745 * Get the produced position
1746 *
1747 * Returns 0 on success, < 0 on error
1748 */
ffe60014 1749int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream,
3bd1e081
MD
1750 unsigned long *pos)
1751{
1752 switch (consumer_data.type) {
1753 case LTTNG_CONSUMER_KERNEL:
ffe60014 1754 return lttng_kconsumer_get_produced_snapshot(stream, pos);
7753dea8
MD
1755 case LTTNG_CONSUMER32_UST:
1756 case LTTNG_CONSUMER64_UST:
ffe60014 1757 return lttng_ustconsumer_get_produced_snapshot(stream, pos);
3bd1e081
MD
1758 default:
1759 ERR("Unknown consumer_data type");
1760 assert(0);
1761 return -ENOSYS;
1762 }
1763}
1764
1765int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx,
1766 int sock, struct pollfd *consumer_sockpoll)
1767{
1768 switch (consumer_data.type) {
1769 case LTTNG_CONSUMER_KERNEL:
1770 return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll);
7753dea8
MD
1771 case LTTNG_CONSUMER32_UST:
1772 case LTTNG_CONSUMER64_UST:
3bd1e081
MD
1773 return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll);
1774 default:
1775 ERR("Unknown consumer_data type");
1776 assert(0);
1777 return -ENOSYS;
1778 }
1779}
1780
43c34bc3
DG
1781/*
1782 * Iterate over all streams of the hashtable and free them properly.
1783 *
1784 * WARNING: *MUST* be used with data stream only.
1785 */
1786static void destroy_data_stream_ht(struct lttng_ht *ht)
1787{
43c34bc3
DG
1788 struct lttng_ht_iter iter;
1789 struct lttng_consumer_stream *stream;
1790
1791 if (ht == NULL) {
1792 return;
1793 }
1794
1795 rcu_read_lock();
1796 cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) {
5c540210
DG
1797 /*
1798 * Ignore return value since we are currently cleaning up so any error
1799 * can't be handled.
1800 */
1801 (void) consumer_del_stream(stream, ht);
43c34bc3
DG
1802 }
1803 rcu_read_unlock();
1804
1805 lttng_ht_destroy(ht);
1806}
1807
fb3a43a9 1808/*
f724d81e 1809 * Iterate over all streams of the hashtable and free them properly.
e316aad5
DG
1810 *
1811 * XXX: Should not be only for metadata stream or else use an other name.
fb3a43a9
DG
1812 */
1813static void destroy_stream_ht(struct lttng_ht *ht)
1814{
fb3a43a9
DG
1815 struct lttng_ht_iter iter;
1816 struct lttng_consumer_stream *stream;
1817
1818 if (ht == NULL) {
1819 return;
1820 }
1821
d09e1200 1822 rcu_read_lock();
58b1f425 1823 cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) {
5c540210
DG
1824 /*
1825 * Ignore return value since we are currently cleaning up so any error
1826 * can't be handled.
1827 */
1828 (void) consumer_del_metadata_stream(stream, ht);
fb3a43a9 1829 }
d09e1200 1830 rcu_read_unlock();
fb3a43a9
DG
1831
1832 lttng_ht_destroy(ht);
1833}
1834
d88aee68
DG
1835void lttng_consumer_close_metadata(void)
1836{
1837 switch (consumer_data.type) {
1838 case LTTNG_CONSUMER_KERNEL:
1839 /*
1840 * The Kernel consumer has a different metadata scheme so we don't
1841 * close anything because the stream will be closed by the session
1842 * daemon.
1843 */
1844 break;
1845 case LTTNG_CONSUMER32_UST:
1846 case LTTNG_CONSUMER64_UST:
1847 /*
1848 * Close all metadata streams. The metadata hash table is passed and
1849 * this call iterates over it by closing all wakeup fd. This is safe
1850 * because at this point we are sure that the metadata producer is
1851 * either dead or blocked.
1852 */
1853 lttng_ustconsumer_close_metadata(metadata_ht);
1854 break;
1855 default:
1856 ERR("Unknown consumer_data type");
1857 assert(0);
1858 }
1859}
1860
fb3a43a9
DG
1861/*
1862 * Clean up a metadata stream and free its memory.
1863 */
e316aad5
DG
1864void consumer_del_metadata_stream(struct lttng_consumer_stream *stream,
1865 struct lttng_ht *ht)
fb3a43a9
DG
1866{
1867 int ret;
e316aad5
DG
1868 struct lttng_ht_iter iter;
1869 struct lttng_consumer_channel *free_chan = NULL;
fb3a43a9
DG
1870 struct consumer_relayd_sock_pair *relayd;
1871
1872 assert(stream);
1873 /*
1874 * This call should NEVER receive regular stream. It must always be
1875 * metadata stream and this is crucial for data structure synchronization.
1876 */
1877 assert(stream->metadata_flag);
1878
e316aad5
DG
1879 DBG3("Consumer delete metadata stream %d", stream->wait_fd);
1880
1881 if (ht == NULL) {
1882 /* Means the stream was allocated but not successfully added */
ffe60014 1883 goto free_stream_rcu;
e316aad5
DG
1884 }
1885
74251bb8 1886 pthread_mutex_lock(&consumer_data.lock);
8994307f
DG
1887 pthread_mutex_lock(&stream->lock);
1888
fb3a43a9
DG
1889 switch (consumer_data.type) {
1890 case LTTNG_CONSUMER_KERNEL:
1891 if (stream->mmap_base != NULL) {
1892 ret = munmap(stream->mmap_base, stream->mmap_len);
1893 if (ret != 0) {
1894 PERROR("munmap metadata stream");
1895 }
1896 }
4c95e622
JD
1897
1898 if (stream->wait_fd >= 0) {
1899 ret = close(stream->wait_fd);
1900 if (ret < 0) {
1901 PERROR("close kernel metadata wait_fd");
1902 }
1903 }
fb3a43a9
DG
1904 break;
1905 case LTTNG_CONSUMER32_UST:
1906 case LTTNG_CONSUMER64_UST:
1907 lttng_ustconsumer_del_stream(stream);
1908 break;
1909 default:
1910 ERR("Unknown consumer_data type");
1911 assert(0);
e316aad5 1912 goto end;
fb3a43a9 1913 }
fb3a43a9 1914
c869f647 1915 rcu_read_lock();
58b1f425 1916 iter.iter.node = &stream->node.node;
c869f647
DG
1917 ret = lttng_ht_del(ht, &iter);
1918 assert(!ret);
ca22feea 1919
d8ef542d
MD
1920 iter.iter.node = &stream->node_channel_id.node;
1921 ret = lttng_ht_del(consumer_data.stream_per_chan_id_ht, &iter);
1922 assert(!ret);
1923
ca22feea
DG
1924 iter.iter.node = &stream->node_session_id.node;
1925 ret = lttng_ht_del(consumer_data.stream_list_ht, &iter);
1926 assert(!ret);
c869f647
DG
1927 rcu_read_unlock();
1928
fb3a43a9
DG
1929 if (stream->out_fd >= 0) {
1930 ret = close(stream->out_fd);
1931 if (ret) {
1932 PERROR("close");
1933 }
1934 }
1935
fb3a43a9
DG
1936 /* Check and cleanup relayd */
1937 rcu_read_lock();
1938 relayd = consumer_find_relayd(stream->net_seq_idx);
1939 if (relayd != NULL) {
1940 uatomic_dec(&relayd->refcount);
1941 assert(uatomic_read(&relayd->refcount) >= 0);
1942
1943 /* Closing streams requires to lock the control socket. */
1944 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
1945 ret = relayd_send_close_stream(&relayd->control_sock,
1946 stream->relayd_stream_id, stream->next_net_seq_num - 1);
1947 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
1948 if (ret < 0) {
1949 DBG("Unable to close stream on the relayd. Continuing");
1950 /*
1951 * Continue here. There is nothing we can do for the relayd.
1952 * Chances are that the relayd has closed the socket so we just
1953 * continue cleaning up.
1954 */
1955 }
1956
1957 /* Both conditions are met, we destroy the relayd. */
1958 if (uatomic_read(&relayd->refcount) == 0 &&
1959 uatomic_read(&relayd->destroy_flag)) {
d09e1200 1960 destroy_relayd(relayd);
fb3a43a9
DG
1961 }
1962 }
1963 rcu_read_unlock();
1964
1965 /* Atomically decrement channel refcount since other threads can use it. */
f2ad556d 1966 if (!uatomic_sub_return(&stream->chan->refcount, 1)
ffe60014 1967 && !uatomic_read(&stream->chan->nb_init_stream_left)) {
c30aaa51 1968 /* Go for channel deletion! */
e316aad5 1969 free_chan = stream->chan;
fb3a43a9
DG
1970 }
1971
e316aad5 1972end:
73811ecc
DG
1973 /*
1974 * Nullify the stream reference so it is not used after deletion. The
1975 * consumer data lock MUST be acquired before being able to check for a
1976 * NULL pointer value.
1977 */
1978 stream->chan->metadata_stream = NULL;
1979
8994307f 1980 pthread_mutex_unlock(&stream->lock);
74251bb8 1981 pthread_mutex_unlock(&consumer_data.lock);
e316aad5
DG
1982
1983 if (free_chan) {
1984 consumer_del_channel(free_chan);
1985 }
1986
ffe60014
DG
1987free_stream_rcu:
1988 call_rcu(&stream->node.head, free_stream_rcu);
fb3a43a9
DG
1989}
1990
1991/*
1992 * Action done with the metadata stream when adding it to the consumer internal
1993 * data structures to handle it.
1994 */
ffe60014 1995static int add_metadata_stream(struct lttng_consumer_stream *stream,
e316aad5 1996 struct lttng_ht *ht)
fb3a43a9 1997{
e316aad5 1998 int ret = 0;
fb3a43a9 1999 struct consumer_relayd_sock_pair *relayd;
76082088 2000 struct lttng_ht_iter iter;
d88aee68 2001 struct lttng_ht_node_u64 *node;
fb3a43a9 2002
e316aad5
DG
2003 assert(stream);
2004 assert(ht);
2005
d88aee68 2006 DBG3("Adding metadata stream %" PRIu64 " to hash table", stream->key);
e316aad5
DG
2007
2008 pthread_mutex_lock(&consumer_data.lock);
2e818a6a 2009 pthread_mutex_lock(&stream->lock);
e316aad5 2010
e316aad5
DG
2011 /*
2012 * From here, refcounts are updated so be _careful_ when returning an error
2013 * after this point.
2014 */
2015
fb3a43a9 2016 rcu_read_lock();
76082088
DG
2017
2018 /*
2019 * Lookup the stream just to make sure it does not exist in our internal
2020 * state. This should NEVER happen.
2021 */
d88aee68
DG
2022 lttng_ht_lookup(ht, &stream->key, &iter);
2023 node = lttng_ht_iter_get_node_u64(&iter);
76082088
DG
2024 assert(!node);
2025
e316aad5 2026 /* Find relayd and, if one is found, increment refcount. */
fb3a43a9
DG
2027 relayd = consumer_find_relayd(stream->net_seq_idx);
2028 if (relayd != NULL) {
2029 uatomic_inc(&relayd->refcount);
2030 }
e316aad5 2031
e316aad5 2032 /*
ffe60014
DG
2033 * When nb_init_stream_left reaches 0, we don't need to trigger any action
2034 * in terms of destroying the associated channel, because the action that
e316aad5
DG
2035 * causes the count to become 0 also causes a stream to be added. The
2036 * channel deletion will thus be triggered by the following removal of this
2037 * stream.
2038 */
ffe60014 2039 if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) {
f2ad556d
MD
2040 /* Increment refcount before decrementing nb_init_stream_left */
2041 cmm_smp_wmb();
ffe60014 2042 uatomic_dec(&stream->chan->nb_init_stream_left);
e316aad5
DG
2043 }
2044
d88aee68 2045 lttng_ht_add_unique_u64(ht, &stream->node);
ca22feea 2046
d8ef542d
MD
2047 lttng_ht_add_unique_u64(consumer_data.stream_per_chan_id_ht,
2048 &stream->node_channel_id);
2049
ca22feea
DG
2050 /*
2051 * Add stream to the stream_list_ht of the consumer data. No need to steal
2052 * the key since the HT does not use it and we allow to add redundant keys
2053 * into this table.
2054 */
d88aee68 2055 lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id);
ca22feea 2056
fb3a43a9 2057 rcu_read_unlock();
e316aad5 2058
2e818a6a 2059 pthread_mutex_unlock(&stream->lock);
e316aad5
DG
2060 pthread_mutex_unlock(&consumer_data.lock);
2061 return ret;
fb3a43a9
DG
2062}
2063
8994307f
DG
2064/*
2065 * Delete data stream that are flagged for deletion (endpoint_status).
2066 */
2067static void validate_endpoint_status_data_stream(void)
2068{
2069 struct lttng_ht_iter iter;
2070 struct lttng_consumer_stream *stream;
2071
2072 DBG("Consumer delete flagged data stream");
2073
2074 rcu_read_lock();
2075 cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) {
2076 /* Validate delete flag of the stream */
79d4ffb7 2077 if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) {
8994307f
DG
2078 continue;
2079 }
2080 /* Delete it right now */
2081 consumer_del_stream(stream, data_ht);
2082 }
2083 rcu_read_unlock();
2084}
2085
2086/*
2087 * Delete metadata stream that are flagged for deletion (endpoint_status).
2088 */
2089static void validate_endpoint_status_metadata_stream(
2090 struct lttng_poll_event *pollset)
2091{
2092 struct lttng_ht_iter iter;
2093 struct lttng_consumer_stream *stream;
2094
2095 DBG("Consumer delete flagged metadata stream");
2096
2097 assert(pollset);
2098
2099 rcu_read_lock();
2100 cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) {
2101 /* Validate delete flag of the stream */
79d4ffb7 2102 if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) {
8994307f
DG
2103 continue;
2104 }
2105 /*
2106 * Remove from pollset so the metadata thread can continue without
2107 * blocking on a deleted stream.
2108 */
2109 lttng_poll_del(pollset, stream->wait_fd);
2110
2111 /* Delete it right now */
2112 consumer_del_metadata_stream(stream, metadata_ht);
2113 }
2114 rcu_read_unlock();
2115}
2116
fb3a43a9
DG
2117/*
2118 * Thread polls on metadata file descriptor and write them on disk or on the
2119 * network.
2120 */
7d980def 2121void *consumer_thread_metadata_poll(void *data)
fb3a43a9
DG
2122{
2123 int ret, i, pollfd;
2124 uint32_t revents, nb_fd;
e316aad5 2125 struct lttng_consumer_stream *stream = NULL;
fb3a43a9 2126 struct lttng_ht_iter iter;
d88aee68 2127 struct lttng_ht_node_u64 *node;
fb3a43a9
DG
2128 struct lttng_poll_event events;
2129 struct lttng_consumer_local_data *ctx = data;
2130 ssize_t len;
2131
2132 rcu_register_thread();
2133
d88aee68 2134 metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
04bb2b64
DG
2135 if (!metadata_ht) {
2136 /* ENOMEM at this point. Better to bail out. */
d8ef542d 2137 goto end_ht;
04bb2b64
DG
2138 }
2139
fb3a43a9
DG
2140 DBG("Thread metadata poll started");
2141
fb3a43a9
DG
2142 /* Size is set to 1 for the consumer_metadata pipe */
2143 ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
2144 if (ret < 0) {
2145 ERR("Poll set creation failed");
d8ef542d 2146 goto end_poll;
fb3a43a9
DG
2147 }
2148
13886d2d
DG
2149 ret = lttng_poll_add(&events,
2150 lttng_pipe_get_readfd(ctx->consumer_metadata_pipe), LPOLLIN);
fb3a43a9
DG
2151 if (ret < 0) {
2152 goto end;
2153 }
2154
2155 /* Main loop */
2156 DBG("Metadata main loop started");
2157
2158 while (1) {
fb3a43a9 2159 /* Only the metadata pipe is set */
d21b0d71 2160 if (LTTNG_POLL_GETNB(&events) == 0 && consumer_quit == 1) {
fb3a43a9
DG
2161 goto end;
2162 }
2163
2164restart:
d21b0d71 2165 DBG("Metadata poll wait with %d fd(s)", LTTNG_POLL_GETNB(&events));
fb3a43a9
DG
2166 ret = lttng_poll_wait(&events, -1);
2167 DBG("Metadata event catched in thread");
2168 if (ret < 0) {
2169 if (errno == EINTR) {
e316aad5 2170 ERR("Poll EINTR catched");
fb3a43a9
DG
2171 goto restart;
2172 }
2173 goto error;
2174 }
2175
0d9c5d77
DG
2176 nb_fd = ret;
2177
e316aad5 2178 /* From here, the event is a metadata wait fd */
fb3a43a9
DG
2179 for (i = 0; i < nb_fd; i++) {
2180 revents = LTTNG_POLL_GETEV(&events, i);
2181 pollfd = LTTNG_POLL_GETFD(&events, i);
2182
e316aad5
DG
2183 /* Just don't waste time if no returned events for the fd */
2184 if (!revents) {
2185 continue;
2186 }
2187
13886d2d 2188 if (pollfd == lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)) {
4adabd61 2189 if (revents & (LPOLLERR | LPOLLHUP )) {
fb3a43a9
DG
2190 DBG("Metadata thread pipe hung up");
2191 /*
2192 * Remove the pipe from the poll set and continue the loop
2193 * since their might be data to consume.
2194 */
13886d2d
DG
2195 lttng_poll_del(&events,
2196 lttng_pipe_get_readfd(ctx->consumer_metadata_pipe));
2197 lttng_pipe_read_close(ctx->consumer_metadata_pipe);
fb3a43a9
DG
2198 continue;
2199 } else if (revents & LPOLLIN) {
13886d2d
DG
2200 ssize_t pipe_len;
2201
2202 pipe_len = lttng_pipe_read(ctx->consumer_metadata_pipe,
2203 &stream, sizeof(stream));
2204 if (pipe_len < 0) {
2205 ERR("read metadata stream, ret: %ld", pipe_len);
fb3a43a9 2206 /*
13886d2d 2207 * Continue here to handle the rest of the streams.
fb3a43a9
DG
2208 */
2209 continue;
2210 }
2211
8994307f
DG
2212 /* A NULL stream means that the state has changed. */
2213 if (stream == NULL) {
2214 /* Check for deleted streams. */
2215 validate_endpoint_status_metadata_stream(&events);
3714380f 2216 goto restart;
8994307f
DG
2217 }
2218
fb3a43a9
DG
2219 DBG("Adding metadata stream %d to poll set",
2220 stream->wait_fd);
2221
ffe60014 2222 ret = add_metadata_stream(stream, metadata_ht);
e316aad5
DG
2223 if (ret) {
2224 ERR("Unable to add metadata stream");
2225 /* Stream was not setup properly. Continuing. */
2226 consumer_del_metadata_stream(stream, NULL);
2227 continue;
2228 }
fb3a43a9
DG
2229
2230 /* Add metadata stream to the global poll events list */
2231 lttng_poll_add(&events, stream->wait_fd,
2232 LPOLLIN | LPOLLPRI);
fb3a43a9
DG
2233 }
2234
e316aad5 2235 /* Handle other stream */
fb3a43a9
DG
2236 continue;
2237 }
2238
d09e1200 2239 rcu_read_lock();
d88aee68
DG
2240 {
2241 uint64_t tmp_id = (uint64_t) pollfd;
2242
2243 lttng_ht_lookup(metadata_ht, &tmp_id, &iter);
2244 }
2245 node = lttng_ht_iter_get_node_u64(&iter);
e316aad5 2246 assert(node);
fb3a43a9
DG
2247
2248 stream = caa_container_of(node, struct lttng_consumer_stream,
58b1f425 2249 node);
fb3a43a9 2250
e316aad5 2251 /* Check for error event */
4adabd61 2252 if (revents & (LPOLLERR | LPOLLHUP)) {
e316aad5 2253 DBG("Metadata fd %d is hup|err.", pollfd);
fb3a43a9
DG
2254 if (!stream->hangup_flush_done
2255 && (consumer_data.type == LTTNG_CONSUMER32_UST
2256 || consumer_data.type == LTTNG_CONSUMER64_UST)) {
2257 DBG("Attempting to flush and consume the UST buffers");
2258 lttng_ustconsumer_on_stream_hangup(stream);
2259
2260 /* We just flushed the stream now read it. */
4bb94b75
DG
2261 do {
2262 len = ctx->on_buffer_ready(stream, ctx);
2263 /*
2264 * We don't check the return value here since if we get
2265 * a negative len, it means an error occured thus we
2266 * simply remove it from the poll set and free the
2267 * stream.
2268 */
2269 } while (len > 0);
fb3a43a9
DG
2270 }
2271
fb3a43a9 2272 lttng_poll_del(&events, stream->wait_fd);
e316aad5
DG
2273 /*
2274 * This call update the channel states, closes file descriptors
2275 * and securely free the stream.
2276 */
2277 consumer_del_metadata_stream(stream, metadata_ht);
2278 } else if (revents & (LPOLLIN | LPOLLPRI)) {
2279 /* Get the data out of the metadata file descriptor */
2280 DBG("Metadata available on fd %d", pollfd);
2281 assert(stream->wait_fd == pollfd);
2282
2283 len = ctx->on_buffer_ready(stream, ctx);
2284 /* It's ok to have an unavailable sub-buffer */
b64403e3 2285 if (len < 0 && len != -EAGAIN && len != -ENODATA) {
ab1027f4
DG
2286 /* Clean up stream from consumer and free it. */
2287 lttng_poll_del(&events, stream->wait_fd);
2288 consumer_del_metadata_stream(stream, metadata_ht);
e316aad5
DG
2289 } else if (len > 0) {
2290 stream->data_read = 1;
2291 }
fb3a43a9 2292 }
e316aad5
DG
2293
2294 /* Release RCU lock for the stream looked up */
d09e1200 2295 rcu_read_unlock();
fb3a43a9
DG
2296 }
2297 }
2298
2299error:
2300end:
2301 DBG("Metadata poll thread exiting");
fb3a43a9 2302
d8ef542d
MD
2303 lttng_poll_clean(&events);
2304end_poll:
04bb2b64 2305 destroy_stream_ht(metadata_ht);
d8ef542d 2306end_ht:
fb3a43a9
DG
2307 rcu_unregister_thread();
2308 return NULL;
2309}
2310
3bd1e081 2311/*
e4421fec 2312 * This thread polls the fds in the set to consume the data and write
3bd1e081
MD
2313 * it to tracefile if necessary.
2314 */
7d980def 2315void *consumer_thread_data_poll(void *data)
3bd1e081
MD
2316{
2317 int num_rdy, num_hup, high_prio, ret, i;
2318 struct pollfd *pollfd = NULL;
2319 /* local view of the streams */
c869f647 2320 struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL;
3bd1e081
MD
2321 /* local view of consumer_data.fds_count */
2322 int nb_fd = 0;
3bd1e081 2323 struct lttng_consumer_local_data *ctx = data;
00e2e675 2324 ssize_t len;
3bd1e081 2325
e7b994a3
DG
2326 rcu_register_thread();
2327
d88aee68 2328 data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
43c34bc3 2329 if (data_ht == NULL) {
04bb2b64 2330 /* ENOMEM at this point. Better to bail out. */
43c34bc3
DG
2331 goto end;
2332 }
2333
effcf122 2334 local_stream = zmalloc(sizeof(struct lttng_consumer_stream));
3bd1e081
MD
2335
2336 while (1) {
2337 high_prio = 0;
2338 num_hup = 0;
2339
2340 /*
e4421fec 2341 * the fds set has been updated, we need to update our
3bd1e081
MD
2342 * local array as well
2343 */
2344 pthread_mutex_lock(&consumer_data.lock);
2345 if (consumer_data.need_update) {
0e428499
DG
2346 free(pollfd);
2347 pollfd = NULL;
2348
2349 free(local_stream);
2350 local_stream = NULL;
3bd1e081 2351
50f8ae69 2352 /* allocate for all fds + 1 for the consumer_data_pipe */
effcf122 2353 pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd));
3bd1e081 2354 if (pollfd == NULL) {
7a57cf92 2355 PERROR("pollfd malloc");
3bd1e081
MD
2356 pthread_mutex_unlock(&consumer_data.lock);
2357 goto end;
2358 }
2359
50f8ae69 2360 /* allocate for all fds + 1 for the consumer_data_pipe */
effcf122 2361 local_stream = zmalloc((consumer_data.stream_count + 1) *
747f8642 2362 sizeof(struct lttng_consumer_stream *));
3bd1e081 2363 if (local_stream == NULL) {
7a57cf92 2364 PERROR("local_stream malloc");
3bd1e081
MD
2365 pthread_mutex_unlock(&consumer_data.lock);
2366 goto end;
2367 }
ffe60014 2368 ret = update_poll_array(ctx, &pollfd, local_stream,
43c34bc3 2369 data_ht);
3bd1e081
MD
2370 if (ret < 0) {
2371 ERR("Error in allocating pollfd or local_outfds");
f73fabfd 2372 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR);
3bd1e081
MD
2373 pthread_mutex_unlock(&consumer_data.lock);
2374 goto end;
2375 }
2376 nb_fd = ret;
2377 consumer_data.need_update = 0;
2378 }
2379 pthread_mutex_unlock(&consumer_data.lock);
2380
4078b776
MD
2381 /* No FDs and consumer_quit, consumer_cleanup the thread */
2382 if (nb_fd == 0 && consumer_quit == 1) {
2383 goto end;
2384 }
3bd1e081 2385 /* poll on the array of fds */
88f2b785 2386 restart:
3bd1e081 2387 DBG("polling on %d fd", nb_fd + 1);
cb365c03 2388 num_rdy = poll(pollfd, nb_fd + 1, -1);
3bd1e081
MD
2389 DBG("poll num_rdy : %d", num_rdy);
2390 if (num_rdy == -1) {
88f2b785
MD
2391 /*
2392 * Restart interrupted system call.
2393 */
2394 if (errno == EINTR) {
2395 goto restart;
2396 }
7a57cf92 2397 PERROR("Poll error");
f73fabfd 2398 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR);
3bd1e081
MD
2399 goto end;
2400 } else if (num_rdy == 0) {
2401 DBG("Polling thread timed out");
2402 goto end;
2403 }
2404
3bd1e081 2405 /*
50f8ae69 2406 * If the consumer_data_pipe triggered poll go directly to the
00e2e675
DG
2407 * beginning of the loop to update the array. We want to prioritize
2408 * array update over low-priority reads.
3bd1e081 2409 */
509bb1cf 2410 if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) {
ab30f567 2411 ssize_t pipe_readlen;
04fdd819 2412
50f8ae69 2413 DBG("consumer_data_pipe wake up");
acdb9057
DG
2414 pipe_readlen = lttng_pipe_read(ctx->consumer_data_pipe,
2415 &new_stream, sizeof(new_stream));
23f5f35d 2416 if (pipe_readlen < 0) {
acdb9057 2417 ERR("Consumer data pipe ret %ld", pipe_readlen);
23f5f35d
DG
2418 /* Continue so we can at least handle the current stream(s). */
2419 continue;
2420 }
c869f647
DG
2421
2422 /*
2423 * If the stream is NULL, just ignore it. It's also possible that
2424 * the sessiond poll thread changed the consumer_quit state and is
2425 * waking us up to test it.
2426 */
2427 if (new_stream == NULL) {
8994307f 2428 validate_endpoint_status_data_stream();
c869f647
DG
2429 continue;
2430 }
2431
ffe60014 2432 ret = add_stream(new_stream, data_ht);
c869f647 2433 if (ret) {
d88aee68 2434 ERR("Consumer add stream %" PRIu64 " failed. Continuing",
c869f647
DG
2435 new_stream->key);
2436 /*
2437 * At this point, if the add_stream fails, it is not in the
2438 * hash table thus passing the NULL value here.
2439 */
2440 consumer_del_stream(new_stream, NULL);
2441 }
2442
2443 /* Continue to update the local streams and handle prio ones */
3bd1e081
MD
2444 continue;
2445 }
2446
2447 /* Take care of high priority channels first. */
2448 for (i = 0; i < nb_fd; i++) {
9617607b
DG
2449 if (local_stream[i] == NULL) {
2450 continue;
2451 }
fb3a43a9 2452 if (pollfd[i].revents & POLLPRI) {
d41f73b7
MD
2453 DBG("Urgent read on fd %d", pollfd[i].fd);
2454 high_prio = 1;
4078b776 2455 len = ctx->on_buffer_ready(local_stream[i], ctx);
d41f73b7 2456 /* it's ok to have an unavailable sub-buffer */
b64403e3 2457 if (len < 0 && len != -EAGAIN && len != -ENODATA) {
ab1027f4
DG
2458 /* Clean the stream and free it. */
2459 consumer_del_stream(local_stream[i], data_ht);
9617607b 2460 local_stream[i] = NULL;
4078b776
MD
2461 } else if (len > 0) {
2462 local_stream[i]->data_read = 1;
d41f73b7 2463 }
3bd1e081
MD
2464 }
2465 }
2466
4078b776
MD
2467 /*
2468 * If we read high prio channel in this loop, try again
2469 * for more high prio data.
2470 */
2471 if (high_prio) {
3bd1e081
MD
2472 continue;
2473 }
2474
2475 /* Take care of low priority channels. */
4078b776 2476 for (i = 0; i < nb_fd; i++) {
9617607b
DG
2477 if (local_stream[i] == NULL) {
2478 continue;
2479 }
4078b776
MD
2480 if ((pollfd[i].revents & POLLIN) ||
2481 local_stream[i]->hangup_flush_done) {
4078b776
MD
2482 DBG("Normal read on fd %d", pollfd[i].fd);
2483 len = ctx->on_buffer_ready(local_stream[i], ctx);
2484 /* it's ok to have an unavailable sub-buffer */
b64403e3 2485 if (len < 0 && len != -EAGAIN && len != -ENODATA) {
ab1027f4
DG
2486 /* Clean the stream and free it. */
2487 consumer_del_stream(local_stream[i], data_ht);
9617607b 2488 local_stream[i] = NULL;
4078b776
MD
2489 } else if (len > 0) {
2490 local_stream[i]->data_read = 1;
2491 }
2492 }
2493 }
2494
2495 /* Handle hangup and errors */
2496 for (i = 0; i < nb_fd; i++) {
9617607b
DG
2497 if (local_stream[i] == NULL) {
2498 continue;
2499 }
4078b776
MD
2500 if (!local_stream[i]->hangup_flush_done
2501 && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL))
2502 && (consumer_data.type == LTTNG_CONSUMER32_UST
2503 || consumer_data.type == LTTNG_CONSUMER64_UST)) {
2504 DBG("fd %d is hup|err|nval. Attempting flush and read.",
9617607b 2505 pollfd[i].fd);
4078b776
MD
2506 lttng_ustconsumer_on_stream_hangup(local_stream[i]);
2507 /* Attempt read again, for the data we just flushed. */
2508 local_stream[i]->data_read = 1;
2509 }
2510 /*
2511 * If the poll flag is HUP/ERR/NVAL and we have
2512 * read no data in this pass, we can remove the
2513 * stream from its hash table.
2514 */
2515 if ((pollfd[i].revents & POLLHUP)) {
2516 DBG("Polling fd %d tells it has hung up.", pollfd[i].fd);
2517 if (!local_stream[i]->data_read) {
43c34bc3 2518 consumer_del_stream(local_stream[i], data_ht);
9617607b 2519 local_stream[i] = NULL;
4078b776
MD
2520 num_hup++;
2521 }
2522 } else if (pollfd[i].revents & POLLERR) {
2523 ERR("Error returned in polling fd %d.", pollfd[i].fd);
2524 if (!local_stream[i]->data_read) {
43c34bc3 2525 consumer_del_stream(local_stream[i], data_ht);
9617607b 2526 local_stream[i] = NULL;
4078b776
MD
2527 num_hup++;
2528 }
2529 } else if (pollfd[i].revents & POLLNVAL) {
2530 ERR("Polling fd %d tells fd is not open.", pollfd[i].fd);
2531 if (!local_stream[i]->data_read) {
43c34bc3 2532 consumer_del_stream(local_stream[i], data_ht);
9617607b 2533 local_stream[i] = NULL;
4078b776 2534 num_hup++;
3bd1e081
MD
2535 }
2536 }
9617607b
DG
2537 if (local_stream[i] != NULL) {
2538 local_stream[i]->data_read = 0;
2539 }
3bd1e081
MD
2540 }
2541 }
2542end:
2543 DBG("polling thread exiting");
0e428499
DG
2544 free(pollfd);
2545 free(local_stream);
fb3a43a9
DG
2546
2547 /*
2548 * Close the write side of the pipe so epoll_wait() in
7d980def
DG
2549 * consumer_thread_metadata_poll can catch it. The thread is monitoring the
2550 * read side of the pipe. If we close them both, epoll_wait strangely does
2551 * not return and could create a endless wait period if the pipe is the
2552 * only tracked fd in the poll set. The thread will take care of closing
2553 * the read side.
fb3a43a9 2554 */
13886d2d 2555 (void) lttng_pipe_write_close(ctx->consumer_metadata_pipe);
fb3a43a9 2556
04bb2b64 2557 destroy_data_stream_ht(data_ht);
43c34bc3 2558
e7b994a3 2559 rcu_unregister_thread();
3bd1e081
MD
2560 return NULL;
2561}
2562
d8ef542d
MD
2563/*
2564 * Close wake-up end of each stream belonging to the channel. This will
2565 * allow the poll() on the stream read-side to detect when the
2566 * write-side (application) finally closes them.
2567 */
2568static
2569void consumer_close_channel_streams(struct lttng_consumer_channel *channel)
2570{
2571 struct lttng_ht *ht;
2572 struct lttng_consumer_stream *stream;
2573 struct lttng_ht_iter iter;
2574
2575 ht = consumer_data.stream_per_chan_id_ht;
2576
2577 rcu_read_lock();
2578 cds_lfht_for_each_entry_duplicate(ht->ht,
2579 ht->hash_fct(&channel->key, lttng_ht_seed),
2580 ht->match_fct, &channel->key,
2581 &iter.iter, stream, node_channel_id.node) {
f2ad556d
MD
2582 /*
2583 * Protect against teardown with mutex.
2584 */
2585 pthread_mutex_lock(&stream->lock);
2586 if (cds_lfht_is_node_deleted(&stream->node.node)) {
2587 goto next;
2588 }
d8ef542d
MD
2589 switch (consumer_data.type) {
2590 case LTTNG_CONSUMER_KERNEL:
2591 break;
2592 case LTTNG_CONSUMER32_UST:
2593 case LTTNG_CONSUMER64_UST:
2594 /*
2595 * Note: a mutex is taken internally within
2596 * liblttng-ust-ctl to protect timer wakeup_fd
2597 * use from concurrent close.
2598 */
2599 lttng_ustconsumer_close_stream_wakeup(stream);
2600 break;
2601 default:
2602 ERR("Unknown consumer_data type");
2603 assert(0);
2604 }
f2ad556d
MD
2605 next:
2606 pthread_mutex_unlock(&stream->lock);
d8ef542d
MD
2607 }
2608 rcu_read_unlock();
2609}
2610
2611static void destroy_channel_ht(struct lttng_ht *ht)
2612{
2613 struct lttng_ht_iter iter;
2614 struct lttng_consumer_channel *channel;
2615 int ret;
2616
2617 if (ht == NULL) {
2618 return;
2619 }
2620
2621 rcu_read_lock();
2622 cds_lfht_for_each_entry(ht->ht, &iter.iter, channel, wait_fd_node.node) {
2623 ret = lttng_ht_del(ht, &iter);
2624 assert(ret != 0);
2625 }
2626 rcu_read_unlock();
2627
2628 lttng_ht_destroy(ht);
2629}
2630
2631/*
2632 * This thread polls the channel fds to detect when they are being
2633 * closed. It closes all related streams if the channel is detected as
2634 * closed. It is currently only used as a shim layer for UST because the
2635 * consumerd needs to keep the per-stream wakeup end of pipes open for
2636 * periodical flush.
2637 */
2638void *consumer_thread_channel_poll(void *data)
2639{
2640 int ret, i, pollfd;
2641 uint32_t revents, nb_fd;
2642 struct lttng_consumer_channel *chan = NULL;
2643 struct lttng_ht_iter iter;
2644 struct lttng_ht_node_u64 *node;
2645 struct lttng_poll_event events;
2646 struct lttng_consumer_local_data *ctx = data;
2647 struct lttng_ht *channel_ht;
2648
2649 rcu_register_thread();
2650
2651 channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
2652 if (!channel_ht) {
2653 /* ENOMEM at this point. Better to bail out. */
2654 goto end_ht;
2655 }
2656
2657 DBG("Thread channel poll started");
2658
2659 /* Size is set to 1 for the consumer_channel pipe */
2660 ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
2661 if (ret < 0) {
2662 ERR("Poll set creation failed");
2663 goto end_poll;
2664 }
2665
2666 ret = lttng_poll_add(&events, ctx->consumer_channel_pipe[0], LPOLLIN);
2667 if (ret < 0) {
2668 goto end;
2669 }
2670
2671 /* Main loop */
2672 DBG("Channel main loop started");
2673
2674 while (1) {
2675 /* Only the channel pipe is set */
2676 if (LTTNG_POLL_GETNB(&events) == 0 && consumer_quit == 1) {
2677 goto end;
2678 }
2679
2680restart:
2681 DBG("Channel poll wait with %d fd(s)", LTTNG_POLL_GETNB(&events));
2682 ret = lttng_poll_wait(&events, -1);
2683 DBG("Channel event catched in thread");
2684 if (ret < 0) {
2685 if (errno == EINTR) {
2686 ERR("Poll EINTR catched");
2687 goto restart;
2688 }
2689 goto end;
2690 }
2691
2692 nb_fd = ret;
2693
2694 /* From here, the event is a channel wait fd */
2695 for (i = 0; i < nb_fd; i++) {
2696 revents = LTTNG_POLL_GETEV(&events, i);
2697 pollfd = LTTNG_POLL_GETFD(&events, i);
2698
2699 /* Just don't waste time if no returned events for the fd */
2700 if (!revents) {
2701 continue;
2702 }
2703 if (pollfd == ctx->consumer_channel_pipe[0]) {
2704 if (revents & (LPOLLERR | LPOLLHUP)) {
2705 DBG("Channel thread pipe hung up");
2706 /*
2707 * Remove the pipe from the poll set and continue the loop
2708 * since their might be data to consume.
2709 */
2710 lttng_poll_del(&events, ctx->consumer_channel_pipe[0]);
2711 continue;
2712 } else if (revents & LPOLLIN) {
2713 enum consumer_channel_action action;
a0cbdd2e 2714 uint64_t key;
d8ef542d 2715
a0cbdd2e 2716 ret = read_channel_pipe(ctx, &chan, &key, &action);
d8ef542d
MD
2717 if (ret <= 0) {
2718 ERR("Error reading channel pipe");
2719 continue;
2720 }
2721
2722 switch (action) {
2723 case CONSUMER_CHANNEL_ADD:
2724 DBG("Adding channel %d to poll set",
2725 chan->wait_fd);
2726
2727 lttng_ht_node_init_u64(&chan->wait_fd_node,
2728 chan->wait_fd);
c7260a81 2729 rcu_read_lock();
d8ef542d
MD
2730 lttng_ht_add_unique_u64(channel_ht,
2731 &chan->wait_fd_node);
c7260a81 2732 rcu_read_unlock();
d8ef542d
MD
2733 /* Add channel to the global poll events list */
2734 lttng_poll_add(&events, chan->wait_fd,
2735 LPOLLIN | LPOLLPRI);
2736 break;
a0cbdd2e
MD
2737 case CONSUMER_CHANNEL_DEL:
2738 {
f2a444f1
DG
2739 struct lttng_consumer_stream *stream, *stmp;
2740
c7260a81 2741 rcu_read_lock();
a0cbdd2e
MD
2742 chan = consumer_find_channel(key);
2743 if (!chan) {
c7260a81 2744 rcu_read_unlock();
a0cbdd2e
MD
2745 ERR("UST consumer get channel key %" PRIu64 " not found for del channel", key);
2746 break;
2747 }
2748 lttng_poll_del(&events, chan->wait_fd);
f623cc0b 2749 iter.iter.node = &chan->wait_fd_node.node;
a0cbdd2e
MD
2750 ret = lttng_ht_del(channel_ht, &iter);
2751 assert(ret == 0);
2752 consumer_close_channel_streams(chan);
2753
f2a444f1
DG
2754 switch (consumer_data.type) {
2755 case LTTNG_CONSUMER_KERNEL:
2756 break;
2757 case LTTNG_CONSUMER32_UST:
2758 case LTTNG_CONSUMER64_UST:
2759 /* Delete streams that might have been left in the stream list. */
2760 cds_list_for_each_entry_safe(stream, stmp, &chan->streams.head,
2761 send_node) {
2762 cds_list_del(&stream->send_node);
2763 lttng_ustconsumer_del_stream(stream);
2764 uatomic_sub(&stream->chan->refcount, 1);
2765 assert(&chan->refcount);
2766 free(stream);
2767 }
2768 break;
2769 default:
2770 ERR("Unknown consumer_data type");
2771 assert(0);
2772 }
2773
a0cbdd2e
MD
2774 /*
2775 * Release our own refcount. Force channel deletion even if
2776 * streams were not initialized.
2777 */
2778 if (!uatomic_sub_return(&chan->refcount, 1)) {
2779 consumer_del_channel(chan);
2780 }
c7260a81 2781 rcu_read_unlock();
a0cbdd2e
MD
2782 goto restart;
2783 }
d8ef542d
MD
2784 case CONSUMER_CHANNEL_QUIT:
2785 /*
2786 * Remove the pipe from the poll set and continue the loop
2787 * since their might be data to consume.
2788 */
2789 lttng_poll_del(&events, ctx->consumer_channel_pipe[0]);
2790 continue;
2791 default:
2792 ERR("Unknown action");
2793 break;
2794 }
2795 }
2796
2797 /* Handle other stream */
2798 continue;
2799 }
2800
2801 rcu_read_lock();
2802 {
2803 uint64_t tmp_id = (uint64_t) pollfd;
2804
2805 lttng_ht_lookup(channel_ht, &tmp_id, &iter);
2806 }
2807 node = lttng_ht_iter_get_node_u64(&iter);
2808 assert(node);
2809
2810 chan = caa_container_of(node, struct lttng_consumer_channel,
2811 wait_fd_node);
2812
2813 /* Check for error event */
2814 if (revents & (LPOLLERR | LPOLLHUP)) {
2815 DBG("Channel fd %d is hup|err.", pollfd);
2816
2817 lttng_poll_del(&events, chan->wait_fd);
2818 ret = lttng_ht_del(channel_ht, &iter);
2819 assert(ret == 0);
f2a444f1 2820 assert(cds_list_empty(&chan->streams.head));
d8ef542d 2821 consumer_close_channel_streams(chan);
f2ad556d
MD
2822
2823 /* Release our own refcount */
2824 if (!uatomic_sub_return(&chan->refcount, 1)
2825 && !uatomic_read(&chan->nb_init_stream_left)) {
2826 consumer_del_channel(chan);
2827 }
d8ef542d
MD
2828 }
2829
2830 /* Release RCU lock for the channel looked up */
2831 rcu_read_unlock();
2832 }
2833 }
2834
2835end:
2836 lttng_poll_clean(&events);
2837end_poll:
2838 destroy_channel_ht(channel_ht);
2839end_ht:
2840 DBG("Channel poll thread exiting");
2841 rcu_unregister_thread();
2842 return NULL;
2843}
2844
331744e3
JD
2845static int set_metadata_socket(struct lttng_consumer_local_data *ctx,
2846 struct pollfd *sockpoll, int client_socket)
2847{
2848 int ret;
2849
2850 assert(ctx);
2851 assert(sockpoll);
2852
2853 if (lttng_consumer_poll_socket(sockpoll) < 0) {
2854 ret = -1;
2855 goto error;
2856 }
2857 DBG("Metadata connection on client_socket");
2858
2859 /* Blocking call, waiting for transmission */
2860 ctx->consumer_metadata_socket = lttcomm_accept_unix_sock(client_socket);
2861 if (ctx->consumer_metadata_socket < 0) {
2862 WARN("On accept metadata");
2863 ret = -1;
2864 goto error;
2865 }
2866 ret = 0;
2867
2868error:
2869 return ret;
2870}
2871
3bd1e081
MD
2872/*
2873 * This thread listens on the consumerd socket and receives the file
2874 * descriptors from the session daemon.
2875 */
7d980def 2876void *consumer_thread_sessiond_poll(void *data)
3bd1e081 2877{
d96f09c6 2878 int sock = -1, client_socket, ret;
3bd1e081
MD
2879 /*
2880 * structure to poll for incoming data on communication socket avoids
2881 * making blocking sockets.
2882 */
2883 struct pollfd consumer_sockpoll[2];
2884 struct lttng_consumer_local_data *ctx = data;
2885
e7b994a3
DG
2886 rcu_register_thread();
2887
3bd1e081
MD
2888 DBG("Creating command socket %s", ctx->consumer_command_sock_path);
2889 unlink(ctx->consumer_command_sock_path);
2890 client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path);
2891 if (client_socket < 0) {
2892 ERR("Cannot create command socket");
2893 goto end;
2894 }
2895
2896 ret = lttcomm_listen_unix_sock(client_socket);
2897 if (ret < 0) {
2898 goto end;
2899 }
2900
32258573 2901 DBG("Sending ready command to lttng-sessiond");
f73fabfd 2902 ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY);
3bd1e081
MD
2903 /* return < 0 on error, but == 0 is not fatal */
2904 if (ret < 0) {
32258573 2905 ERR("Error sending ready command to lttng-sessiond");
3bd1e081
MD
2906 goto end;
2907 }
2908
3bd1e081
MD
2909 /* prepare the FDs to poll : to client socket and the should_quit pipe */
2910 consumer_sockpoll[0].fd = ctx->consumer_should_quit[0];
2911 consumer_sockpoll[0].events = POLLIN | POLLPRI;
2912 consumer_sockpoll[1].fd = client_socket;
2913 consumer_sockpoll[1].events = POLLIN | POLLPRI;
2914
2915 if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
2916 goto end;
2917 }
2918 DBG("Connection on client_socket");
2919
2920 /* Blocking call, waiting for transmission */
2921 sock = lttcomm_accept_unix_sock(client_socket);
534d2592 2922 if (sock < 0) {
3bd1e081
MD
2923 WARN("On accept");
2924 goto end;
2925 }
3bd1e081 2926
331744e3
JD
2927 /*
2928 * Setup metadata socket which is the second socket connection on the
2929 * command unix socket.
2930 */
2931 ret = set_metadata_socket(ctx, consumer_sockpoll, client_socket);
2932 if (ret < 0) {
2933 goto end;
2934 }
2935
d96f09c6
DG
2936 /* This socket is not useful anymore. */
2937 ret = close(client_socket);
2938 if (ret < 0) {
2939 PERROR("close client_socket");
2940 }
2941 client_socket = -1;
2942
3bd1e081
MD
2943 /* update the polling structure to poll on the established socket */
2944 consumer_sockpoll[1].fd = sock;
2945 consumer_sockpoll[1].events = POLLIN | POLLPRI;
2946
2947 while (1) {
2948 if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
2949 goto end;
2950 }
2951 DBG("Incoming command on sock");
2952 ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll);
2953 if (ret == -ENOENT) {
2954 DBG("Received STOP command");
2955 goto end;
2956 }
4cbc1a04
DG
2957 if (ret <= 0) {
2958 /*
2959 * This could simply be a session daemon quitting. Don't output
2960 * ERR() here.
2961 */
2962 DBG("Communication interrupted on command socket");
3bd1e081
MD
2963 goto end;
2964 }
2965 if (consumer_quit) {
2966 DBG("consumer_thread_receive_fds received quit from signal");
2967 goto end;
2968 }
ffe60014 2969 DBG("received command on sock");
3bd1e081
MD
2970 }
2971end:
ffe60014 2972 DBG("Consumer thread sessiond poll exiting");
3bd1e081 2973
d88aee68
DG
2974 /*
2975 * Close metadata streams since the producer is the session daemon which
2976 * just died.
2977 *
2978 * NOTE: for now, this only applies to the UST tracer.
2979 */
2980 lttng_consumer_close_metadata();
2981
3bd1e081
MD
2982 /*
2983 * when all fds have hung up, the polling thread
2984 * can exit cleanly
2985 */
2986 consumer_quit = 1;
2987
04fdd819 2988 /*
c869f647 2989 * Notify the data poll thread to poll back again and test the
8994307f 2990 * consumer_quit state that we just set so to quit gracefully.
04fdd819 2991 */
acdb9057 2992 notify_thread_lttng_pipe(ctx->consumer_data_pipe);
c869f647 2993
a0cbdd2e 2994 notify_channel_pipe(ctx, NULL, -1, CONSUMER_CHANNEL_QUIT);
d8ef542d 2995
d96f09c6
DG
2996 /* Cleaning up possibly open sockets. */
2997 if (sock >= 0) {
2998 ret = close(sock);
2999 if (ret < 0) {
3000 PERROR("close sock sessiond poll");
3001 }
3002 }
3003 if (client_socket >= 0) {
38476d24 3004 ret = close(client_socket);
d96f09c6
DG
3005 if (ret < 0) {
3006 PERROR("close client_socket sessiond poll");
3007 }
3008 }
3009
e7b994a3 3010 rcu_unregister_thread();
3bd1e081
MD
3011 return NULL;
3012}
d41f73b7 3013
4078b776 3014ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
d41f73b7
MD
3015 struct lttng_consumer_local_data *ctx)
3016{
74251bb8
DG
3017 ssize_t ret;
3018
3019 pthread_mutex_lock(&stream->lock);
3020
d41f73b7
MD
3021 switch (consumer_data.type) {
3022 case LTTNG_CONSUMER_KERNEL:
74251bb8
DG
3023 ret = lttng_kconsumer_read_subbuffer(stream, ctx);
3024 break;
7753dea8
MD
3025 case LTTNG_CONSUMER32_UST:
3026 case LTTNG_CONSUMER64_UST:
74251bb8
DG
3027 ret = lttng_ustconsumer_read_subbuffer(stream, ctx);
3028 break;
d41f73b7
MD
3029 default:
3030 ERR("Unknown consumer_data type");
3031 assert(0);
74251bb8
DG
3032 ret = -ENOSYS;
3033 break;
d41f73b7 3034 }
74251bb8
DG
3035
3036 pthread_mutex_unlock(&stream->lock);
3037 return ret;
d41f73b7
MD
3038}
3039
3040int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream)
3041{
3042 switch (consumer_data.type) {
3043 case LTTNG_CONSUMER_KERNEL:
3044 return lttng_kconsumer_on_recv_stream(stream);
7753dea8
MD
3045 case LTTNG_CONSUMER32_UST:
3046 case LTTNG_CONSUMER64_UST:
d41f73b7
MD
3047 return lttng_ustconsumer_on_recv_stream(stream);
3048 default:
3049 ERR("Unknown consumer_data type");
3050 assert(0);
3051 return -ENOSYS;
3052 }
3053}
e4421fec
DG
3054
3055/*
3056 * Allocate and set consumer data hash tables.
3057 */
3058void lttng_consumer_init(void)
3059{
d88aee68
DG
3060 consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
3061 consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
3062 consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
d8ef542d 3063 consumer_data.stream_per_chan_id_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
e4421fec 3064}
7735ef9e
DG
3065
3066/*
3067 * Process the ADD_RELAYD command receive by a consumer.
3068 *
3069 * This will create a relayd socket pair and add it to the relayd hash table.
3070 * The caller MUST acquire a RCU read side lock before calling it.
3071 */
3072int consumer_add_relayd_socket(int net_seq_idx, int sock_type,
3073 struct lttng_consumer_local_data *ctx, int sock,
6151a90f
JD
3074 struct pollfd *consumer_sockpoll,
3075 struct lttcomm_relayd_sock *relayd_sock, unsigned int sessiond_id)
7735ef9e 3076{
cd2b09ed 3077 int fd = -1, ret = -1, relayd_created = 0;
f50f23d9 3078 enum lttng_error_code ret_code = LTTNG_OK;
d4298c99 3079 struct consumer_relayd_sock_pair *relayd = NULL;
7735ef9e 3080
6151a90f
JD
3081 assert(ctx);
3082 assert(relayd_sock);
3083
7735ef9e
DG
3084 DBG("Consumer adding relayd socket (idx: %d)", net_seq_idx);
3085
f50f23d9
DG
3086 /* First send a status message before receiving the fds. */
3087 ret = consumer_send_status_msg(sock, ret_code);
3088 if (ret < 0) {
3089 /* Somehow, the session daemon is not responding anymore. */
3090 goto error;
3091 }
3092
7735ef9e
DG
3093 /* Get relayd reference if exists. */
3094 relayd = consumer_find_relayd(net_seq_idx);
3095 if (relayd == NULL) {
3096 /* Not found. Allocate one. */
3097 relayd = consumer_allocate_relayd_sock_pair(net_seq_idx);
3098 if (relayd == NULL) {
f73fabfd 3099 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
59e71485 3100 ret = -1;
7735ef9e
DG
3101 goto error;
3102 }
f7079f67 3103 relayd->sessiond_session_id = (uint64_t) sessiond_id;
cd2b09ed 3104 relayd_created = 1;
7735ef9e
DG
3105 }
3106
3107 /* Poll on consumer socket. */
3108 if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
3109 ret = -EINTR;
3110 goto error;
3111 }
3112
3113 /* Get relayd socket from session daemon */
3114 ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1);
3115 if (ret != sizeof(fd)) {
f73fabfd 3116 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD);
7735ef9e 3117 ret = -1;
4028eeb9 3118 fd = -1; /* Just in case it gets set with an invalid value. */
ffe60014 3119 goto error_close;
7735ef9e
DG
3120 }
3121
f50f23d9
DG
3122 /* We have the fds without error. Send status back. */
3123 ret = consumer_send_status_msg(sock, ret_code);
3124 if (ret < 0) {
3125 /* Somehow, the session daemon is not responding anymore. */
3126 goto error;
3127 }
3128
7735ef9e
DG
3129 /* Copy socket information and received FD */
3130 switch (sock_type) {
3131 case LTTNG_STREAM_CONTROL:
3132 /* Copy received lttcomm socket */
6151a90f
JD
3133 lttcomm_copy_sock(&relayd->control_sock.sock, &relayd_sock->sock);
3134 ret = lttcomm_create_sock(&relayd->control_sock.sock);
4028eeb9 3135 /* Immediately try to close the created socket if valid. */
6151a90f
JD
3136 if (relayd->control_sock.sock.fd >= 0) {
3137 if (close(relayd->control_sock.sock.fd)) {
4028eeb9
DG
3138 PERROR("close relayd control socket");
3139 }
7735ef9e 3140 }
4028eeb9 3141 /* Handle create_sock error. */
f66c074c 3142 if (ret < 0) {
4028eeb9 3143 goto error;
f66c074c 3144 }
7735ef9e
DG
3145
3146 /* Assign new file descriptor */
6151a90f
JD
3147 relayd->control_sock.sock.fd = fd;
3148 /* Assign version values. */
3149 relayd->control_sock.major = relayd_sock->major;
3150 relayd->control_sock.minor = relayd_sock->minor;
c5b6f4f0
DG
3151
3152 /*
59e71485
DG
3153 * Create a session on the relayd and store the returned id. Lock the
3154 * control socket mutex if the relayd was NOT created before.
c5b6f4f0 3155 */
59e71485
DG
3156 if (!relayd_created) {
3157 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
3158 }
c5b6f4f0 3159 ret = relayd_create_session(&relayd->control_sock,
f7079f67 3160 &relayd->relayd_session_id);
59e71485
DG
3161 if (!relayd_created) {
3162 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
3163 }
c5b6f4f0 3164 if (ret < 0) {
ffe60014
DG
3165 /*
3166 * Close all sockets of a relayd object. It will be freed if it was
3167 * created at the error code path or else it will be garbage
3168 * collect.
3169 */
3170 (void) relayd_close(&relayd->control_sock);
3171 (void) relayd_close(&relayd->data_sock);
c5b6f4f0
DG
3172 goto error;
3173 }
3174
7735ef9e
DG
3175 break;
3176 case LTTNG_STREAM_DATA:
3177 /* Copy received lttcomm socket */
6151a90f
JD
3178 lttcomm_copy_sock(&relayd->data_sock.sock, &relayd_sock->sock);
3179 ret = lttcomm_create_sock(&relayd->data_sock.sock);
4028eeb9 3180 /* Immediately try to close the created socket if valid. */
6151a90f
JD
3181 if (relayd->data_sock.sock.fd >= 0) {
3182 if (close(relayd->data_sock.sock.fd)) {
4028eeb9
DG
3183 PERROR("close relayd data socket");
3184 }
7735ef9e 3185 }
4028eeb9 3186 /* Handle create_sock error. */
f66c074c 3187 if (ret < 0) {
4028eeb9 3188 goto error;
f66c074c 3189 }
7735ef9e
DG
3190
3191 /* Assign new file descriptor */
6151a90f
JD
3192 relayd->data_sock.sock.fd = fd;
3193 /* Assign version values. */
3194 relayd->data_sock.major = relayd_sock->major;
3195 relayd->data_sock.minor = relayd_sock->minor;
7735ef9e
DG
3196 break;
3197 default:
3198 ERR("Unknown relayd socket type (%d)", sock_type);
59e71485 3199 ret = -1;
7735ef9e
DG
3200 goto error;
3201 }
3202
d88aee68 3203 DBG("Consumer %s socket created successfully with net idx %" PRIu64 " (fd: %d)",
7735ef9e
DG
3204 sock_type == LTTNG_STREAM_CONTROL ? "control" : "data",
3205 relayd->net_seq_idx, fd);
3206
3207 /*
3208 * Add relayd socket pair to consumer data hashtable. If object already
3209 * exists or on error, the function gracefully returns.
3210 */
d09e1200 3211 add_relayd(relayd);
7735ef9e
DG
3212
3213 /* All good! */
4028eeb9 3214 return 0;
7735ef9e
DG
3215
3216error:
4028eeb9
DG
3217 /* Close received socket if valid. */
3218 if (fd >= 0) {
3219 if (close(fd)) {
3220 PERROR("close received socket");
3221 }
3222 }
cd2b09ed 3223
ffe60014 3224error_close:
cd2b09ed 3225 if (relayd_created) {
cd2b09ed
DG
3226 free(relayd);
3227 }
3228
7735ef9e
DG
3229 return ret;
3230}
ca22feea 3231
4e9a4686
DG
3232/*
3233 * Try to lock the stream mutex.
3234 *
3235 * On success, 1 is returned else 0 indicating that the mutex is NOT lock.
3236 */
3237static int stream_try_lock(struct lttng_consumer_stream *stream)
3238{
3239 int ret;
3240
3241 assert(stream);
3242
3243 /*
3244 * Try to lock the stream mutex. On failure, we know that the stream is
3245 * being used else where hence there is data still being extracted.
3246 */
3247 ret = pthread_mutex_trylock(&stream->lock);
3248 if (ret) {
3249 /* For both EBUSY and EINVAL error, the mutex is NOT locked. */
3250 ret = 0;
3251 goto end;
3252 }
3253
3254 ret = 1;
3255
3256end:
3257 return ret;
3258}
3259
f7079f67
DG
3260/*
3261 * Search for a relayd associated to the session id and return the reference.
3262 *
3263 * A rcu read side lock MUST be acquire before calling this function and locked
3264 * until the relayd object is no longer necessary.
3265 */
3266static struct consumer_relayd_sock_pair *find_relayd_by_session_id(uint64_t id)
3267{
3268 struct lttng_ht_iter iter;
f7079f67 3269 struct consumer_relayd_sock_pair *relayd = NULL;
f7079f67
DG
3270
3271 /* Iterate over all relayd since they are indexed by net_seq_idx. */
3272 cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd,
3273 node.node) {
18261bd1
DG
3274 /*
3275 * Check by sessiond id which is unique here where the relayd session
3276 * id might not be when having multiple relayd.
3277 */
3278 if (relayd->sessiond_session_id == id) {
f7079f67 3279 /* Found the relayd. There can be only one per id. */
18261bd1 3280 goto found;
f7079f67
DG
3281 }
3282 }
3283
18261bd1
DG
3284 return NULL;
3285
3286found:
f7079f67
DG
3287 return relayd;
3288}
3289
ca22feea
DG
3290/*
3291 * Check if for a given session id there is still data needed to be extract
3292 * from the buffers.
3293 *
6d805429 3294 * Return 1 if data is pending or else 0 meaning ready to be read.
ca22feea 3295 */
6d805429 3296int consumer_data_pending(uint64_t id)
ca22feea
DG
3297{
3298 int ret;
3299 struct lttng_ht_iter iter;
3300 struct lttng_ht *ht;
3301 struct lttng_consumer_stream *stream;
f7079f67 3302 struct consumer_relayd_sock_pair *relayd = NULL;
6d805429 3303 int (*data_pending)(struct lttng_consumer_stream *);
ca22feea 3304
6d805429 3305 DBG("Consumer data pending command on session id %" PRIu64, id);
ca22feea 3306
6f6eda74 3307 rcu_read_lock();
ca22feea
DG
3308 pthread_mutex_lock(&consumer_data.lock);
3309
3310 switch (consumer_data.type) {
3311 case LTTNG_CONSUMER_KERNEL:
6d805429 3312 data_pending = lttng_kconsumer_data_pending;
ca22feea
DG
3313 break;
3314 case LTTNG_CONSUMER32_UST:
3315 case LTTNG_CONSUMER64_UST:
6d805429 3316 data_pending = lttng_ustconsumer_data_pending;
ca22feea
DG
3317 break;
3318 default:
3319 ERR("Unknown consumer data type");
3320 assert(0);
3321 }
3322
3323 /* Ease our life a bit */
3324 ht = consumer_data.stream_list_ht;
3325
f7079f67
DG
3326 relayd = find_relayd_by_session_id(id);
3327 if (relayd) {
3328 /* Send init command for data pending. */
3329 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
3330 ret = relayd_begin_data_pending(&relayd->control_sock,
3331 relayd->relayd_session_id);
3332 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
3333 if (ret < 0) {
3334 /* Communication error thus the relayd so no data pending. */
3335 goto data_not_pending;
3336 }
3337 }
3338
c8f59ee5 3339 cds_lfht_for_each_entry_duplicate(ht->ht,
d88aee68
DG
3340 ht->hash_fct(&id, lttng_ht_seed),
3341 ht->match_fct, &id,
ca22feea 3342 &iter.iter, stream, node_session_id.node) {
4e9a4686
DG
3343 /* If this call fails, the stream is being used hence data pending. */
3344 ret = stream_try_lock(stream);
3345 if (!ret) {
f7079f67 3346 goto data_pending;
ca22feea 3347 }
ca22feea 3348
4e9a4686
DG
3349 /*
3350 * A removed node from the hash table indicates that the stream has
3351 * been deleted thus having a guarantee that the buffers are closed
3352 * on the consumer side. However, data can still be transmitted
3353 * over the network so don't skip the relayd check.
3354 */
3355 ret = cds_lfht_is_node_deleted(&stream->node.node);
3356 if (!ret) {
3357 /* Check the stream if there is data in the buffers. */
6d805429
DG
3358 ret = data_pending(stream);
3359 if (ret == 1) {
4e9a4686 3360 pthread_mutex_unlock(&stream->lock);
f7079f67 3361 goto data_pending;
4e9a4686
DG
3362 }
3363 }
3364
3365 /* Relayd check */
f7079f67 3366 if (relayd) {
c8f59ee5
DG
3367 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
3368 if (stream->metadata_flag) {
ad7051c0
DG
3369 ret = relayd_quiescent_control(&relayd->control_sock,
3370 stream->relayd_stream_id);
c8f59ee5 3371 } else {
6d805429 3372 ret = relayd_data_pending(&relayd->control_sock,
39df6d9f
DG
3373 stream->relayd_stream_id,
3374 stream->next_net_seq_num - 1);
c8f59ee5
DG
3375 }
3376 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
6d805429 3377 if (ret == 1) {
4e9a4686 3378 pthread_mutex_unlock(&stream->lock);
f7079f67 3379 goto data_pending;
c8f59ee5
DG
3380 }
3381 }
4e9a4686 3382 pthread_mutex_unlock(&stream->lock);
c8f59ee5 3383 }
ca22feea 3384
f7079f67
DG
3385 if (relayd) {
3386 unsigned int is_data_inflight = 0;
3387
3388 /* Send init command for data pending. */
3389 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
3390 ret = relayd_end_data_pending(&relayd->control_sock,
3391 relayd->relayd_session_id, &is_data_inflight);
3392 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
bdd88757 3393 if (ret < 0) {
f7079f67
DG
3394 goto data_not_pending;
3395 }
bdd88757
DG
3396 if (is_data_inflight) {
3397 goto data_pending;
3398 }
f7079f67
DG
3399 }
3400
ca22feea 3401 /*
f7079f67
DG
3402 * Finding _no_ node in the hash table and no inflight data means that the
3403 * stream(s) have been removed thus data is guaranteed to be available for
3404 * analysis from the trace files.
ca22feea
DG
3405 */
3406
f7079f67 3407data_not_pending:
ca22feea
DG
3408 /* Data is available to be read by a viewer. */
3409 pthread_mutex_unlock(&consumer_data.lock);
c8f59ee5 3410 rcu_read_unlock();
6d805429 3411 return 0;
ca22feea 3412
f7079f67 3413data_pending:
ca22feea
DG
3414 /* Data is still being extracted from buffers. */
3415 pthread_mutex_unlock(&consumer_data.lock);
c8f59ee5 3416 rcu_read_unlock();
6d805429 3417 return 1;
ca22feea 3418}
f50f23d9
DG
3419
3420/*
3421 * Send a ret code status message to the sessiond daemon.
3422 *
3423 * Return the sendmsg() return value.
3424 */
3425int consumer_send_status_msg(int sock, int ret_code)
3426{
3427 struct lttcomm_consumer_status_msg msg;
3428
3429 msg.ret_code = ret_code;
3430
3431 return lttcomm_send_unix_sock(sock, &msg, sizeof(msg));
3432}
ffe60014
DG
3433
3434/*
3435 * Send a channel status message to the sessiond daemon.
3436 *
3437 * Return the sendmsg() return value.
3438 */
3439int consumer_send_status_channel(int sock,
3440 struct lttng_consumer_channel *channel)
3441{
3442 struct lttcomm_consumer_status_channel msg;
3443
3444 assert(sock >= 0);
3445
3446 if (!channel) {
3447 msg.ret_code = -LTTNG_ERR_UST_CHAN_FAIL;
3448 } else {
3449 msg.ret_code = LTTNG_OK;
3450 msg.key = channel->key;
3451 msg.stream_count = channel->streams.count;
3452 }
3453
3454 return lttcomm_send_unix_sock(sock, &msg, sizeof(msg));
3455}
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