consumerd: remove unused function consumer_del_data_stream
[lttng-tools.git] / src / common / consumer / consumer.c
CommitLineData
3bd1e081
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1/*
2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
00e2e675 4 * 2012 - David Goulet <dgoulet@efficios.com>
3bd1e081 5 *
d14d33bf
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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 *
d14d33bf
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10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
3bd1e081 14 *
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15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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18 */
19
6c1c0768 20#define _LGPL_SOURCE
3bd1e081 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
51a9e1c7 33#include <bin/lttng-consumerd/health-consumerd.h>
990570ed 34#include <common/common.h>
fb3a43a9 35#include <common/utils.h>
d2956687 36#include <common/time.h>
fb3a43a9 37#include <common/compat/poll.h>
f263b7fd 38#include <common/compat/endian.h>
309167d2 39#include <common/index/index.h>
10a8a223 40#include <common/kernel-ctl/kernel-ctl.h>
00e2e675 41#include <common/sessiond-comm/relayd.h>
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42#include <common/sessiond-comm/sessiond-comm.h>
43#include <common/kernel-consumer/kernel-consumer.h>
00e2e675 44#include <common/relayd/relayd.h>
10a8a223 45#include <common/ust-consumer/ust-consumer.h>
c8fea79c
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46#include <common/consumer/consumer-timer.h>
47#include <common/consumer/consumer.h>
48#include <common/consumer/consumer-stream.h>
49#include <common/consumer/consumer-testpoint.h>
50#include <common/align.h>
5feafd41 51#include <common/consumer/consumer-metadata-cache.h>
d2956687
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52#include <common/trace-chunk.h>
53#include <common/trace-chunk-registry.h>
54#include <common/string-utils/format.h>
c35f9726 55#include <common/dynamic-array.h>
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56
57struct lttng_consumer_global_data consumer_data = {
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58 .stream_count = 0,
59 .need_update = 1,
60 .type = LTTNG_CONSUMER_UNKNOWN,
61};
62
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63enum consumer_channel_action {
64 CONSUMER_CHANNEL_ADD,
a0cbdd2e 65 CONSUMER_CHANNEL_DEL,
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66 CONSUMER_CHANNEL_QUIT,
67};
68
69struct consumer_channel_msg {
70 enum consumer_channel_action action;
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71 struct lttng_consumer_channel *chan; /* add */
72 uint64_t key; /* del */
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73};
74
80957876 75/* Flag used to temporarily pause data consumption from testpoints. */
cf0bcb51
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76int data_consumption_paused;
77
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78/*
79 * Flag to inform the polling thread to quit when all fd hung up. Updated by
80 * the consumer_thread_receive_fds when it notices that all fds has hung up.
81 * Also updated by the signal handler (consumer_should_exit()). Read by the
82 * polling threads.
83 */
10211f5c 84int consumer_quit;
3bd1e081 85
43c34bc3 86/*
43c34bc3
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87 * Global hash table containing respectively metadata and data streams. The
88 * stream element in this ht should only be updated by the metadata poll thread
89 * for the metadata and the data poll thread for the data.
90 */
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91static struct lttng_ht *metadata_ht;
92static struct lttng_ht *data_ht;
43c34bc3 93
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94/*
95 * Notify a thread lttng pipe to poll back again. This usually means that some
96 * global state has changed so we just send back the thread in a poll wait
97 * call.
98 */
99static void notify_thread_lttng_pipe(struct lttng_pipe *pipe)
100{
101 struct lttng_consumer_stream *null_stream = NULL;
102
103 assert(pipe);
104
105 (void) lttng_pipe_write(pipe, &null_stream, sizeof(null_stream));
106}
107
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108static void notify_health_quit_pipe(int *pipe)
109{
6cd525e8 110 ssize_t ret;
5c635c72 111
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112 ret = lttng_write(pipe[1], "4", 1);
113 if (ret < 1) {
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114 PERROR("write consumer health quit");
115 }
116}
117
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118static void notify_channel_pipe(struct lttng_consumer_local_data *ctx,
119 struct lttng_consumer_channel *chan,
a0cbdd2e 120 uint64_t key,
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121 enum consumer_channel_action action)
122{
123 struct consumer_channel_msg msg;
6cd525e8 124 ssize_t ret;
d8ef542d 125
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126 memset(&msg, 0, sizeof(msg));
127
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128 msg.action = action;
129 msg.chan = chan;
f21dae48 130 msg.key = key;
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131 ret = lttng_write(ctx->consumer_channel_pipe[1], &msg, sizeof(msg));
132 if (ret < sizeof(msg)) {
133 PERROR("notify_channel_pipe write error");
134 }
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135}
136
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137void notify_thread_del_channel(struct lttng_consumer_local_data *ctx,
138 uint64_t key)
139{
140 notify_channel_pipe(ctx, NULL, key, CONSUMER_CHANNEL_DEL);
141}
142
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143static int read_channel_pipe(struct lttng_consumer_local_data *ctx,
144 struct lttng_consumer_channel **chan,
a0cbdd2e 145 uint64_t *key,
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146 enum consumer_channel_action *action)
147{
148 struct consumer_channel_msg msg;
6cd525e8 149 ssize_t ret;
d8ef542d 150
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151 ret = lttng_read(ctx->consumer_channel_pipe[0], &msg, sizeof(msg));
152 if (ret < sizeof(msg)) {
153 ret = -1;
154 goto error;
d8ef542d 155 }
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156 *action = msg.action;
157 *chan = msg.chan;
158 *key = msg.key;
159error:
160 return (int) ret;
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161}
162
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163/*
164 * Cleanup the stream list of a channel. Those streams are not yet globally
165 * visible
166 */
167static void clean_channel_stream_list(struct lttng_consumer_channel *channel)
168{
169 struct lttng_consumer_stream *stream, *stmp;
170
171 assert(channel);
172
173 /* Delete streams that might have been left in the stream list. */
174 cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head,
175 send_node) {
176 cds_list_del(&stream->send_node);
177 /*
178 * Once a stream is added to this list, the buffers were created so we
179 * have a guarantee that this call will succeed. Setting the monitor
180 * mode to 0 so we don't lock nor try to delete the stream from the
181 * global hash table.
182 */
183 stream->monitor = 0;
184 consumer_stream_destroy(stream, NULL);
185 }
186}
187
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188/*
189 * Find a stream. The consumer_data.lock must be locked during this
190 * call.
191 */
d88aee68 192static struct lttng_consumer_stream *find_stream(uint64_t key,
8389e4f8 193 struct lttng_ht *ht)
3bd1e081 194{
e4421fec 195 struct lttng_ht_iter iter;
d88aee68 196 struct lttng_ht_node_u64 *node;
e4421fec 197 struct lttng_consumer_stream *stream = NULL;
3bd1e081 198
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199 assert(ht);
200
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201 /* -1ULL keys are lookup failures */
202 if (key == (uint64_t) -1ULL) {
7ad0a0cb 203 return NULL;
7a57cf92 204 }
e4421fec 205
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206 rcu_read_lock();
207
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208 lttng_ht_lookup(ht, &key, &iter);
209 node = lttng_ht_iter_get_node_u64(&iter);
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210 if (node != NULL) {
211 stream = caa_container_of(node, struct lttng_consumer_stream, node);
3bd1e081 212 }
e4421fec 213
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214 rcu_read_unlock();
215
e4421fec 216 return stream;
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217}
218
da009f2c 219static void steal_stream_key(uint64_t key, struct lttng_ht *ht)
7ad0a0cb
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220{
221 struct lttng_consumer_stream *stream;
222
04253271 223 rcu_read_lock();
ffe60014 224 stream = find_stream(key, ht);
04253271 225 if (stream) {
da009f2c 226 stream->key = (uint64_t) -1ULL;
04253271
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227 /*
228 * We don't want the lookup to match, but we still need
229 * to iterate on this stream when iterating over the hash table. Just
230 * change the node key.
231 */
da009f2c 232 stream->node.key = (uint64_t) -1ULL;
04253271
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233 }
234 rcu_read_unlock();
7ad0a0cb
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235}
236
d56db448
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237/*
238 * Return a channel object for the given key.
239 *
240 * RCU read side lock MUST be acquired before calling this function and
241 * protects the channel ptr.
242 */
d88aee68 243struct lttng_consumer_channel *consumer_find_channel(uint64_t key)
3bd1e081 244{
e4421fec 245 struct lttng_ht_iter iter;
d88aee68 246 struct lttng_ht_node_u64 *node;
e4421fec 247 struct lttng_consumer_channel *channel = NULL;
3bd1e081 248
d88aee68
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249 /* -1ULL keys are lookup failures */
250 if (key == (uint64_t) -1ULL) {
7ad0a0cb 251 return NULL;
7a57cf92 252 }
e4421fec 253
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254 lttng_ht_lookup(consumer_data.channel_ht, &key, &iter);
255 node = lttng_ht_iter_get_node_u64(&iter);
e4421fec
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256 if (node != NULL) {
257 channel = caa_container_of(node, struct lttng_consumer_channel, node);
3bd1e081 258 }
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259
260 return channel;
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261}
262
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263/*
264 * There is a possibility that the consumer does not have enough time between
265 * the close of the channel on the session daemon and the cleanup in here thus
266 * once we have a channel add with an existing key, we know for sure that this
267 * channel will eventually get cleaned up by all streams being closed.
268 *
269 * This function just nullifies the already existing channel key.
270 */
271static void steal_channel_key(uint64_t key)
272{
273 struct lttng_consumer_channel *channel;
274
275 rcu_read_lock();
276 channel = consumer_find_channel(key);
277 if (channel) {
278 channel->key = (uint64_t) -1ULL;
279 /*
280 * We don't want the lookup to match, but we still need to iterate on
281 * this channel when iterating over the hash table. Just change the
282 * node key.
283 */
284 channel->node.key = (uint64_t) -1ULL;
285 }
286 rcu_read_unlock();
287}
288
ffe60014 289static void free_channel_rcu(struct rcu_head *head)
702b1ea4 290{
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291 struct lttng_ht_node_u64 *node =
292 caa_container_of(head, struct lttng_ht_node_u64, head);
ffe60014
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293 struct lttng_consumer_channel *channel =
294 caa_container_of(node, struct lttng_consumer_channel, node);
702b1ea4 295
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296 switch (consumer_data.type) {
297 case LTTNG_CONSUMER_KERNEL:
298 break;
299 case LTTNG_CONSUMER32_UST:
300 case LTTNG_CONSUMER64_UST:
301 lttng_ustconsumer_free_channel(channel);
302 break;
303 default:
304 ERR("Unknown consumer_data type");
305 abort();
306 }
ffe60014 307 free(channel);
702b1ea4
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308}
309
00e2e675
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310/*
311 * RCU protected relayd socket pair free.
312 */
ffe60014 313static void free_relayd_rcu(struct rcu_head *head)
00e2e675 314{
d88aee68
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315 struct lttng_ht_node_u64 *node =
316 caa_container_of(head, struct lttng_ht_node_u64, head);
00e2e675
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317 struct consumer_relayd_sock_pair *relayd =
318 caa_container_of(node, struct consumer_relayd_sock_pair, node);
319
8994307f
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320 /*
321 * Close all sockets. This is done in the call RCU since we don't want the
322 * socket fds to be reassigned thus potentially creating bad state of the
323 * relayd object.
324 *
325 * We do not have to lock the control socket mutex here since at this stage
326 * there is no one referencing to this relayd object.
327 */
328 (void) relayd_close(&relayd->control_sock);
329 (void) relayd_close(&relayd->data_sock);
330
3a84e2f3 331 pthread_mutex_destroy(&relayd->ctrl_sock_mutex);
00e2e675
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332 free(relayd);
333}
334
335/*
336 * Destroy and free relayd socket pair object.
00e2e675 337 */
51230d70 338void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd)
00e2e675
DG
339{
340 int ret;
341 struct lttng_ht_iter iter;
342
173af62f
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343 if (relayd == NULL) {
344 return;
345 }
346
00e2e675
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347 DBG("Consumer destroy and close relayd socket pair");
348
349 iter.iter.node = &relayd->node.node;
350 ret = lttng_ht_del(consumer_data.relayd_ht, &iter);
173af62f 351 if (ret != 0) {
8994307f 352 /* We assume the relayd is being or is destroyed */
173af62f
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353 return;
354 }
00e2e675 355
00e2e675 356 /* RCU free() call */
ffe60014
DG
357 call_rcu(&relayd->node.head, free_relayd_rcu);
358}
359
360/*
361 * Remove a channel from the global list protected by a mutex. This function is
362 * also responsible for freeing its data structures.
363 */
364void consumer_del_channel(struct lttng_consumer_channel *channel)
365{
ffe60014
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366 struct lttng_ht_iter iter;
367
d88aee68 368 DBG("Consumer delete channel key %" PRIu64, channel->key);
ffe60014
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369
370 pthread_mutex_lock(&consumer_data.lock);
a9838785 371 pthread_mutex_lock(&channel->lock);
ffe60014 372
212d67a2
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373 /* Destroy streams that might have been left in the stream list. */
374 clean_channel_stream_list(channel);
51e762e5 375
d3e2ba59
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376 if (channel->live_timer_enabled == 1) {
377 consumer_timer_live_stop(channel);
378 }
e9404c27
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379 if (channel->monitor_timer_enabled == 1) {
380 consumer_timer_monitor_stop(channel);
381 }
d3e2ba59 382
ffe60014
DG
383 switch (consumer_data.type) {
384 case LTTNG_CONSUMER_KERNEL:
385 break;
386 case LTTNG_CONSUMER32_UST:
387 case LTTNG_CONSUMER64_UST:
388 lttng_ustconsumer_del_channel(channel);
389 break;
390 default:
391 ERR("Unknown consumer_data type");
392 assert(0);
393 goto end;
394 }
395
d2956687
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396 lttng_trace_chunk_put(channel->trace_chunk);
397 channel->trace_chunk = NULL;
5c3892a6 398
d2956687
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399 if (channel->is_published) {
400 int ret;
401
402 rcu_read_lock();
403 iter.iter.node = &channel->node.node;
404 ret = lttng_ht_del(consumer_data.channel_ht, &iter);
405 assert(!ret);
ffe60014 406
d2956687
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407 iter.iter.node = &channel->channels_by_session_id_ht_node.node;
408 ret = lttng_ht_del(consumer_data.channels_by_session_id_ht,
409 &iter);
410 assert(!ret);
411 rcu_read_unlock();
412 }
413
b6921a17
JG
414 channel->is_deleted = true;
415 call_rcu(&channel->node.head, free_channel_rcu);
ffe60014 416end:
a9838785 417 pthread_mutex_unlock(&channel->lock);
ffe60014 418 pthread_mutex_unlock(&consumer_data.lock);
00e2e675
DG
419}
420
228b5bf7
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421/*
422 * Iterate over the relayd hash table and destroy each element. Finally,
423 * destroy the whole hash table.
424 */
425static void cleanup_relayd_ht(void)
426{
427 struct lttng_ht_iter iter;
428 struct consumer_relayd_sock_pair *relayd;
429
430 rcu_read_lock();
431
432 cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd,
433 node.node) {
51230d70 434 consumer_destroy_relayd(relayd);
228b5bf7
DG
435 }
436
228b5bf7 437 rcu_read_unlock();
36b588ed
MD
438
439 lttng_ht_destroy(consumer_data.relayd_ht);
228b5bf7
DG
440}
441
8994307f
DG
442/*
443 * Update the end point status of all streams having the given network sequence
444 * index (relayd index).
445 *
446 * It's atomically set without having the stream mutex locked which is fine
447 * because we handle the write/read race with a pipe wakeup for each thread.
448 */
da009f2c 449static void update_endpoint_status_by_netidx(uint64_t net_seq_idx,
8994307f
DG
450 enum consumer_endpoint_status status)
451{
452 struct lttng_ht_iter iter;
453 struct lttng_consumer_stream *stream;
454
da009f2c 455 DBG("Consumer set delete flag on stream by idx %" PRIu64, net_seq_idx);
8994307f
DG
456
457 rcu_read_lock();
458
459 /* Let's begin with metadata */
460 cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) {
461 if (stream->net_seq_idx == net_seq_idx) {
462 uatomic_set(&stream->endpoint_status, status);
463 DBG("Delete flag set to metadata stream %d", stream->wait_fd);
464 }
465 }
466
467 /* Follow up by the data streams */
468 cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) {
469 if (stream->net_seq_idx == net_seq_idx) {
470 uatomic_set(&stream->endpoint_status, status);
471 DBG("Delete flag set to data stream %d", stream->wait_fd);
472 }
473 }
474 rcu_read_unlock();
475}
476
477/*
478 * Cleanup a relayd object by flagging every associated streams for deletion,
479 * destroying the object meaning removing it from the relayd hash table,
480 * closing the sockets and freeing the memory in a RCU call.
481 *
482 * If a local data context is available, notify the threads that the streams'
483 * state have changed.
484 */
9276e5c8 485void lttng_consumer_cleanup_relayd(struct consumer_relayd_sock_pair *relayd)
8994307f 486{
da009f2c 487 uint64_t netidx;
8994307f
DG
488
489 assert(relayd);
490
9276e5c8 491 DBG("Cleaning up relayd object ID %"PRIu64, relayd->net_seq_idx);
9617607b 492
8994307f
DG
493 /* Save the net sequence index before destroying the object */
494 netidx = relayd->net_seq_idx;
495
496 /*
497 * Delete the relayd from the relayd hash table, close the sockets and free
498 * the object in a RCU call.
499 */
51230d70 500 consumer_destroy_relayd(relayd);
8994307f
DG
501
502 /* Set inactive endpoint to all streams */
503 update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE);
504
505 /*
506 * With a local data context, notify the threads that the streams' state
507 * have changed. The write() action on the pipe acts as an "implicit"
508 * memory barrier ordering the updates of the end point status from the
509 * read of this status which happens AFTER receiving this notify.
510 */
9276e5c8
JR
511 notify_thread_lttng_pipe(relayd->ctx->consumer_data_pipe);
512 notify_thread_lttng_pipe(relayd->ctx->consumer_metadata_pipe);
8994307f
DG
513}
514
a6ba4fe1
DG
515/*
516 * Flag a relayd socket pair for destruction. Destroy it if the refcount
517 * reaches zero.
518 *
519 * RCU read side lock MUST be aquired before calling this function.
520 */
521void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd)
522{
523 assert(relayd);
524
525 /* Set destroy flag for this object */
526 uatomic_set(&relayd->destroy_flag, 1);
527
528 /* Destroy the relayd if refcount is 0 */
529 if (uatomic_read(&relayd->refcount) == 0) {
51230d70 530 consumer_destroy_relayd(relayd);
a6ba4fe1
DG
531 }
532}
533
3bd1e081 534/*
1d1a276c
DG
535 * Completly destroy stream from every visiable data structure and the given
536 * hash table if one.
537 *
538 * One this call returns, the stream object is not longer usable nor visible.
3bd1e081 539 */
e316aad5
DG
540void consumer_del_stream(struct lttng_consumer_stream *stream,
541 struct lttng_ht *ht)
3bd1e081 542{
1d1a276c 543 consumer_stream_destroy(stream, ht);
3bd1e081
MD
544}
545
5ab66908
MD
546/*
547 * XXX naming of del vs destroy is all mixed up.
548 */
549void consumer_del_stream_for_data(struct lttng_consumer_stream *stream)
550{
551 consumer_stream_destroy(stream, data_ht);
552}
553
554void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream)
555{
556 consumer_stream_destroy(stream, metadata_ht);
557}
558
d9a2e16e
JD
559void consumer_stream_update_channel_attributes(
560 struct lttng_consumer_stream *stream,
561 struct lttng_consumer_channel *channel)
562{
563 stream->channel_read_only_attributes.tracefile_size =
564 channel->tracefile_size;
d9a2e16e
JD
565}
566
d88aee68
DG
567struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key,
568 uint64_t stream_key,
ffe60014 569 const char *channel_name,
57a269f2 570 uint64_t relayd_id,
53632229 571 uint64_t session_id,
d2956687 572 struct lttng_trace_chunk *trace_chunk,
ffe60014
DG
573 int cpu,
574 int *alloc_ret,
4891ece8 575 enum consumer_channel_type type,
d2956687 576 unsigned int monitor)
3bd1e081 577{
ffe60014 578 int ret;
3bd1e081 579 struct lttng_consumer_stream *stream;
3bd1e081 580
effcf122 581 stream = zmalloc(sizeof(*stream));
3bd1e081 582 if (stream == NULL) {
7a57cf92 583 PERROR("malloc struct lttng_consumer_stream");
ffe60014 584 ret = -ENOMEM;
7a57cf92 585 goto end;
3bd1e081 586 }
7a57cf92 587
d2956687
JG
588 if (trace_chunk && !lttng_trace_chunk_get(trace_chunk)) {
589 ERR("Failed to acquire trace chunk reference during the creation of a stream");
590 ret = -1;
591 goto error;
592 }
d56db448 593
d2956687 594 rcu_read_lock();
3bd1e081 595 stream->key = stream_key;
d2956687 596 stream->trace_chunk = trace_chunk;
3bd1e081
MD
597 stream->out_fd = -1;
598 stream->out_fd_offset = 0;
e5d1a9b3 599 stream->output_written = 0;
ffe60014 600 stream->net_seq_idx = relayd_id;
53632229 601 stream->session_id = session_id;
4891ece8 602 stream->monitor = monitor;
774d490c 603 stream->endpoint_status = CONSUMER_ENDPOINT_ACTIVE;
f8f3885c 604 stream->index_file = NULL;
fb83fe64 605 stream->last_sequence_number = -1ULL;
53632229 606 pthread_mutex_init(&stream->lock, NULL);
c585821b 607 pthread_mutex_init(&stream->metadata_timer_lock, NULL);
58b1f425 608
ffe60014
DG
609 /* If channel is the metadata, flag this stream as metadata. */
610 if (type == CONSUMER_CHANNEL_TYPE_METADATA) {
611 stream->metadata_flag = 1;
612 /* Metadata is flat out. */
613 strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name));
94d49140
JD
614 /* Live rendez-vous point. */
615 pthread_cond_init(&stream->metadata_rdv, NULL);
616 pthread_mutex_init(&stream->metadata_rdv_lock, NULL);
58b1f425 617 } else {
ffe60014
DG
618 /* Format stream name to <channel_name>_<cpu_number> */
619 ret = snprintf(stream->name, sizeof(stream->name), "%s_%d",
620 channel_name, cpu);
621 if (ret < 0) {
622 PERROR("snprintf stream name");
623 goto error;
624 }
58b1f425 625 }
c30aaa51 626
ffe60014 627 /* Key is always the wait_fd for streams. */
d88aee68 628 lttng_ht_node_init_u64(&stream->node, stream->key);
ffe60014 629
d8ef542d
MD
630 /* Init node per channel id key */
631 lttng_ht_node_init_u64(&stream->node_channel_id, channel_key);
632
53632229 633 /* Init session id node with the stream session id */
d88aee68 634 lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id);
53632229 635
07b86b52
JD
636 DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64
637 " relayd_id %" PRIu64 ", session_id %" PRIu64,
638 stream->name, stream->key, channel_key,
639 stream->net_seq_idx, stream->session_id);
d56db448
DG
640
641 rcu_read_unlock();
3bd1e081 642 return stream;
c80048c6
MD
643
644error:
d56db448 645 rcu_read_unlock();
d2956687 646 lttng_trace_chunk_put(stream->trace_chunk);
c80048c6 647 free(stream);
7a57cf92 648end:
ffe60014
DG
649 if (alloc_ret) {
650 *alloc_ret = ret;
651 }
c80048c6 652 return NULL;
3bd1e081
MD
653}
654
655/*
656 * Add a stream to the global list protected by a mutex.
657 */
66d583dc 658void consumer_add_data_stream(struct lttng_consumer_stream *stream)
3bd1e081 659{
5ab66908 660 struct lttng_ht *ht = data_ht;
3bd1e081 661
e316aad5 662 assert(stream);
43c34bc3 663 assert(ht);
c77fc10a 664
d88aee68 665 DBG3("Adding consumer stream %" PRIu64, stream->key);
e316aad5
DG
666
667 pthread_mutex_lock(&consumer_data.lock);
a9838785 668 pthread_mutex_lock(&stream->chan->lock);
ec6ea7d0 669 pthread_mutex_lock(&stream->chan->timer_lock);
2e818a6a 670 pthread_mutex_lock(&stream->lock);
b0b335c8 671 rcu_read_lock();
e316aad5 672
43c34bc3 673 /* Steal stream identifier to avoid having streams with the same key */
ffe60014 674 steal_stream_key(stream->key, ht);
43c34bc3 675
d88aee68 676 lttng_ht_add_unique_u64(ht, &stream->node);
00e2e675 677
d8ef542d
MD
678 lttng_ht_add_u64(consumer_data.stream_per_chan_id_ht,
679 &stream->node_channel_id);
680
ca22feea
DG
681 /*
682 * Add stream to the stream_list_ht of the consumer data. No need to steal
683 * the key since the HT does not use it and we allow to add redundant keys
684 * into this table.
685 */
d88aee68 686 lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id);
ca22feea 687
e316aad5 688 /*
ffe60014
DG
689 * When nb_init_stream_left reaches 0, we don't need to trigger any action
690 * in terms of destroying the associated channel, because the action that
e316aad5
DG
691 * causes the count to become 0 also causes a stream to be added. The
692 * channel deletion will thus be triggered by the following removal of this
693 * stream.
694 */
ffe60014 695 if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) {
f2ad556d
MD
696 /* Increment refcount before decrementing nb_init_stream_left */
697 cmm_smp_wmb();
ffe60014 698 uatomic_dec(&stream->chan->nb_init_stream_left);
e316aad5
DG
699 }
700
701 /* Update consumer data once the node is inserted. */
3bd1e081
MD
702 consumer_data.stream_count++;
703 consumer_data.need_update = 1;
704
e316aad5 705 rcu_read_unlock();
2e818a6a 706 pthread_mutex_unlock(&stream->lock);
ec6ea7d0 707 pthread_mutex_unlock(&stream->chan->timer_lock);
a9838785 708 pthread_mutex_unlock(&stream->chan->lock);
3bd1e081 709 pthread_mutex_unlock(&consumer_data.lock);
3bd1e081
MD
710}
711
00e2e675 712/*
3f8e211f
DG
713 * Add relayd socket to global consumer data hashtable. RCU read side lock MUST
714 * be acquired before calling this.
00e2e675 715 */
d09e1200 716static int add_relayd(struct consumer_relayd_sock_pair *relayd)
00e2e675
DG
717{
718 int ret = 0;
d88aee68 719 struct lttng_ht_node_u64 *node;
00e2e675
DG
720 struct lttng_ht_iter iter;
721
ffe60014 722 assert(relayd);
00e2e675 723
00e2e675 724 lttng_ht_lookup(consumer_data.relayd_ht,
d88aee68
DG
725 &relayd->net_seq_idx, &iter);
726 node = lttng_ht_iter_get_node_u64(&iter);
00e2e675 727 if (node != NULL) {
00e2e675
DG
728 goto end;
729 }
d88aee68 730 lttng_ht_add_unique_u64(consumer_data.relayd_ht, &relayd->node);
00e2e675 731
00e2e675
DG
732end:
733 return ret;
734}
735
736/*
737 * Allocate and return a consumer relayd socket.
738 */
027a694f 739static struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair(
da009f2c 740 uint64_t net_seq_idx)
00e2e675
DG
741{
742 struct consumer_relayd_sock_pair *obj = NULL;
743
da009f2c
MD
744 /* net sequence index of -1 is a failure */
745 if (net_seq_idx == (uint64_t) -1ULL) {
00e2e675
DG
746 goto error;
747 }
748
749 obj = zmalloc(sizeof(struct consumer_relayd_sock_pair));
750 if (obj == NULL) {
751 PERROR("zmalloc relayd sock");
752 goto error;
753 }
754
755 obj->net_seq_idx = net_seq_idx;
756 obj->refcount = 0;
173af62f 757 obj->destroy_flag = 0;
f96e4545
MD
758 obj->control_sock.sock.fd = -1;
759 obj->data_sock.sock.fd = -1;
d88aee68 760 lttng_ht_node_init_u64(&obj->node, obj->net_seq_idx);
00e2e675
DG
761 pthread_mutex_init(&obj->ctrl_sock_mutex, NULL);
762
763error:
764 return obj;
765}
766
767/*
768 * Find a relayd socket pair in the global consumer data.
769 *
770 * Return the object if found else NULL.
b0b335c8
MD
771 * RCU read-side lock must be held across this call and while using the
772 * returned object.
00e2e675 773 */
d88aee68 774struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key)
00e2e675
DG
775{
776 struct lttng_ht_iter iter;
d88aee68 777 struct lttng_ht_node_u64 *node;
00e2e675
DG
778 struct consumer_relayd_sock_pair *relayd = NULL;
779
780 /* Negative keys are lookup failures */
d88aee68 781 if (key == (uint64_t) -1ULL) {
00e2e675
DG
782 goto error;
783 }
784
d88aee68 785 lttng_ht_lookup(consumer_data.relayd_ht, &key,
00e2e675 786 &iter);
d88aee68 787 node = lttng_ht_iter_get_node_u64(&iter);
00e2e675
DG
788 if (node != NULL) {
789 relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node);
790 }
791
00e2e675
DG
792error:
793 return relayd;
794}
795
10a50311
JD
796/*
797 * Find a relayd and send the stream
798 *
799 * Returns 0 on success, < 0 on error
800 */
801int consumer_send_relayd_stream(struct lttng_consumer_stream *stream,
802 char *path)
803{
804 int ret = 0;
805 struct consumer_relayd_sock_pair *relayd;
806
807 assert(stream);
808 assert(stream->net_seq_idx != -1ULL);
809 assert(path);
810
811 /* The stream is not metadata. Get relayd reference if exists. */
812 rcu_read_lock();
813 relayd = consumer_find_relayd(stream->net_seq_idx);
814 if (relayd != NULL) {
815 /* Add stream on the relayd */
816 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
817 ret = relayd_add_stream(&relayd->control_sock, stream->name,
818 path, &stream->relayd_stream_id,
d2956687
JG
819 stream->chan->tracefile_size,
820 stream->chan->tracefile_count,
821 stream->trace_chunk);
10a50311
JD
822 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
823 if (ret < 0) {
9276e5c8
JR
824 ERR("Relayd add stream failed. Cleaning up relayd %" PRIu64".", relayd->net_seq_idx);
825 lttng_consumer_cleanup_relayd(relayd);
10a50311
JD
826 goto end;
827 }
1c20f0e2 828
10a50311 829 uatomic_inc(&relayd->refcount);
d01178b6 830 stream->sent_to_relayd = 1;
10a50311
JD
831 } else {
832 ERR("Stream %" PRIu64 " relayd ID %" PRIu64 " unknown. Can't send it.",
833 stream->key, stream->net_seq_idx);
834 ret = -1;
835 goto end;
836 }
837
838 DBG("Stream %s with key %" PRIu64 " sent to relayd id %" PRIu64,
839 stream->name, stream->key, stream->net_seq_idx);
840
841end:
842 rcu_read_unlock();
843 return ret;
844}
845
a4baae1b
JD
846/*
847 * Find a relayd and send the streams sent message
848 *
849 * Returns 0 on success, < 0 on error
850 */
851int consumer_send_relayd_streams_sent(uint64_t net_seq_idx)
852{
853 int ret = 0;
854 struct consumer_relayd_sock_pair *relayd;
855
856 assert(net_seq_idx != -1ULL);
857
858 /* The stream is not metadata. Get relayd reference if exists. */
859 rcu_read_lock();
860 relayd = consumer_find_relayd(net_seq_idx);
861 if (relayd != NULL) {
862 /* Add stream on the relayd */
863 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
864 ret = relayd_streams_sent(&relayd->control_sock);
865 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
866 if (ret < 0) {
9276e5c8
JR
867 ERR("Relayd streams sent failed. Cleaning up relayd %" PRIu64".", relayd->net_seq_idx);
868 lttng_consumer_cleanup_relayd(relayd);
a4baae1b
JD
869 goto end;
870 }
871 } else {
872 ERR("Relayd ID %" PRIu64 " unknown. Can't send streams_sent.",
873 net_seq_idx);
874 ret = -1;
875 goto end;
876 }
877
878 ret = 0;
879 DBG("All streams sent relayd id %" PRIu64, net_seq_idx);
880
881end:
882 rcu_read_unlock();
883 return ret;
884}
885
10a50311
JD
886/*
887 * Find a relayd and close the stream
888 */
889void close_relayd_stream(struct lttng_consumer_stream *stream)
890{
891 struct consumer_relayd_sock_pair *relayd;
892
893 /* The stream is not metadata. Get relayd reference if exists. */
894 rcu_read_lock();
895 relayd = consumer_find_relayd(stream->net_seq_idx);
896 if (relayd) {
897 consumer_stream_relayd_close(stream, relayd);
898 }
899 rcu_read_unlock();
900}
901
00e2e675
DG
902/*
903 * Handle stream for relayd transmission if the stream applies for network
904 * streaming where the net sequence index is set.
905 *
906 * Return destination file descriptor or negative value on error.
907 */
6197aea7 908static int write_relayd_stream_header(struct lttng_consumer_stream *stream,
1d4dfdef
DG
909 size_t data_size, unsigned long padding,
910 struct consumer_relayd_sock_pair *relayd)
00e2e675
DG
911{
912 int outfd = -1, ret;
00e2e675
DG
913 struct lttcomm_relayd_data_hdr data_hdr;
914
915 /* Safety net */
916 assert(stream);
6197aea7 917 assert(relayd);
00e2e675
DG
918
919 /* Reset data header */
920 memset(&data_hdr, 0, sizeof(data_hdr));
921
00e2e675
DG
922 if (stream->metadata_flag) {
923 /* Caller MUST acquire the relayd control socket lock */
924 ret = relayd_send_metadata(&relayd->control_sock, data_size);
925 if (ret < 0) {
926 goto error;
927 }
928
929 /* Metadata are always sent on the control socket. */
6151a90f 930 outfd = relayd->control_sock.sock.fd;
00e2e675
DG
931 } else {
932 /* Set header with stream information */
933 data_hdr.stream_id = htobe64(stream->relayd_stream_id);
934 data_hdr.data_size = htobe32(data_size);
1d4dfdef 935 data_hdr.padding_size = htobe32(padding);
c35f9726 936
39df6d9f
DG
937 /*
938 * Note that net_seq_num below is assigned with the *current* value of
939 * next_net_seq_num and only after that the next_net_seq_num will be
940 * increment. This is why when issuing a command on the relayd using
941 * this next value, 1 should always be substracted in order to compare
942 * the last seen sequence number on the relayd side to the last sent.
943 */
3604f373 944 data_hdr.net_seq_num = htobe64(stream->next_net_seq_num);
00e2e675
DG
945 /* Other fields are zeroed previously */
946
947 ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr,
948 sizeof(data_hdr));
949 if (ret < 0) {
950 goto error;
951 }
952
3604f373
DG
953 ++stream->next_net_seq_num;
954
00e2e675 955 /* Set to go on data socket */
6151a90f 956 outfd = relayd->data_sock.sock.fd;
00e2e675
DG
957 }
958
959error:
960 return outfd;
961}
962
d2956687
JG
963/*
964 * Trigger a dump of the metadata content. Following/during the succesful
965 * completion of this call, the metadata poll thread will start receiving
966 * metadata packets to consume.
967 *
968 * The caller must hold the channel and stream locks.
969 */
970static
971int consumer_metadata_stream_dump(struct lttng_consumer_stream *stream)
972{
973 int ret;
974
975 ASSERT_LOCKED(stream->chan->lock);
976 ASSERT_LOCKED(stream->lock);
977 assert(stream->metadata_flag);
978 assert(stream->chan->trace_chunk);
979
980 switch (consumer_data.type) {
981 case LTTNG_CONSUMER_KERNEL:
982 /*
983 * Reset the position of what has been read from the
984 * metadata cache to 0 so we can dump it again.
985 */
986 ret = kernctl_metadata_cache_dump(stream->wait_fd);
987 break;
988 case LTTNG_CONSUMER32_UST:
989 case LTTNG_CONSUMER64_UST:
990 /*
991 * Reset the position pushed from the metadata cache so it
992 * will write from the beginning on the next push.
993 */
994 stream->ust_metadata_pushed = 0;
995 ret = consumer_metadata_wakeup_pipe(stream->chan);
996 break;
997 default:
998 ERR("Unknown consumer_data type");
999 abort();
1000 }
1001 if (ret < 0) {
1002 ERR("Failed to dump the metadata cache");
1003 }
1004 return ret;
1005}
1006
1007static
1008int lttng_consumer_channel_set_trace_chunk(
1009 struct lttng_consumer_channel *channel,
1010 struct lttng_trace_chunk *new_trace_chunk)
1011{
d2956687 1012 pthread_mutex_lock(&channel->lock);
b6921a17
JG
1013 if (channel->is_deleted) {
1014 /*
1015 * The channel has been logically deleted and should no longer
1016 * be used. It has released its reference to its current trace
1017 * chunk and should not acquire a new one.
1018 *
1019 * Return success as there is nothing for the caller to do.
1020 */
1021 goto end;
1022 }
d2956687
JG
1023
1024 /*
1025 * The acquisition of the reference cannot fail (barring
1026 * a severe internal error) since a reference to the published
1027 * chunk is already held by the caller.
1028 */
1029 if (new_trace_chunk) {
1030 const bool acquired_reference = lttng_trace_chunk_get(
1031 new_trace_chunk);
1032
1033 assert(acquired_reference);
1034 }
1035
1036 lttng_trace_chunk_put(channel->trace_chunk);
1037 channel->trace_chunk = new_trace_chunk;
d2956687
JG
1038end:
1039 pthread_mutex_unlock(&channel->lock);
ce1aa6fe 1040 return 0;
d2956687
JG
1041}
1042
3bd1e081 1043/*
ffe60014
DG
1044 * Allocate and return a new lttng_consumer_channel object using the given key
1045 * to initialize the hash table node.
1046 *
1047 * On error, return NULL.
3bd1e081 1048 */
886224ff 1049struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key,
ffe60014 1050 uint64_t session_id,
d2956687 1051 const uint64_t *chunk_id,
ffe60014
DG
1052 const char *pathname,
1053 const char *name,
57a269f2 1054 uint64_t relayd_id,
1624d5b7
JD
1055 enum lttng_event_output output,
1056 uint64_t tracefile_size,
2bba9e53 1057 uint64_t tracefile_count,
1950109e 1058 uint64_t session_id_per_pid,
ecc48a90 1059 unsigned int monitor,
d7ba1388 1060 unsigned int live_timer_interval,
3d071855 1061 const char *root_shm_path,
d7ba1388 1062 const char *shm_path)
3bd1e081 1063{
d2956687
JG
1064 struct lttng_consumer_channel *channel = NULL;
1065 struct lttng_trace_chunk *trace_chunk = NULL;
1066
1067 if (chunk_id) {
1068 trace_chunk = lttng_trace_chunk_registry_find_chunk(
1069 consumer_data.chunk_registry, session_id,
1070 *chunk_id);
1071 if (!trace_chunk) {
1072 ERR("Failed to find trace chunk reference during creation of channel");
1073 goto end;
1074 }
1075 }
3bd1e081 1076
276b26d1 1077 channel = zmalloc(sizeof(*channel));
3bd1e081 1078 if (channel == NULL) {
7a57cf92 1079 PERROR("malloc struct lttng_consumer_channel");
3bd1e081
MD
1080 goto end;
1081 }
ffe60014
DG
1082
1083 channel->key = key;
3bd1e081 1084 channel->refcount = 0;
ffe60014 1085 channel->session_id = session_id;
1950109e 1086 channel->session_id_per_pid = session_id_per_pid;
ffe60014 1087 channel->relayd_id = relayd_id;
1624d5b7
JD
1088 channel->tracefile_size = tracefile_size;
1089 channel->tracefile_count = tracefile_count;
2bba9e53 1090 channel->monitor = monitor;
ecc48a90 1091 channel->live_timer_interval = live_timer_interval;
a9838785 1092 pthread_mutex_init(&channel->lock, NULL);
ec6ea7d0 1093 pthread_mutex_init(&channel->timer_lock, NULL);
ffe60014 1094
0c759fc9
DG
1095 switch (output) {
1096 case LTTNG_EVENT_SPLICE:
1097 channel->output = CONSUMER_CHANNEL_SPLICE;
1098 break;
1099 case LTTNG_EVENT_MMAP:
1100 channel->output = CONSUMER_CHANNEL_MMAP;
1101 break;
1102 default:
1103 assert(0);
1104 free(channel);
1105 channel = NULL;
1106 goto end;
1107 }
1108
07b86b52
JD
1109 /*
1110 * In monitor mode, the streams associated with the channel will be put in
1111 * a special list ONLY owned by this channel. So, the refcount is set to 1
1112 * here meaning that the channel itself has streams that are referenced.
1113 *
1114 * On a channel deletion, once the channel is no longer visible, the
1115 * refcount is decremented and checked for a zero value to delete it. With
1116 * streams in no monitor mode, it will now be safe to destroy the channel.
1117 */
1118 if (!channel->monitor) {
1119 channel->refcount = 1;
1120 }
1121
ffe60014
DG
1122 strncpy(channel->pathname, pathname, sizeof(channel->pathname));
1123 channel->pathname[sizeof(channel->pathname) - 1] = '\0';
1124
1125 strncpy(channel->name, name, sizeof(channel->name));
1126 channel->name[sizeof(channel->name) - 1] = '\0';
1127
3d071855
MD
1128 if (root_shm_path) {
1129 strncpy(channel->root_shm_path, root_shm_path, sizeof(channel->root_shm_path));
1130 channel->root_shm_path[sizeof(channel->root_shm_path) - 1] = '\0';
1131 }
d7ba1388
MD
1132 if (shm_path) {
1133 strncpy(channel->shm_path, shm_path, sizeof(channel->shm_path));
1134 channel->shm_path[sizeof(channel->shm_path) - 1] = '\0';
1135 }
1136
d88aee68 1137 lttng_ht_node_init_u64(&channel->node, channel->key);
5c3892a6
JG
1138 lttng_ht_node_init_u64(&channel->channels_by_session_id_ht_node,
1139 channel->session_id);
d8ef542d
MD
1140
1141 channel->wait_fd = -1;
ffe60014
DG
1142 CDS_INIT_LIST_HEAD(&channel->streams.head);
1143
d2956687
JG
1144 if (trace_chunk) {
1145 int ret = lttng_consumer_channel_set_trace_chunk(channel,
1146 trace_chunk);
1147 if (ret) {
1148 goto error;
1149 }
1150 }
1151
62a7b8ed 1152 DBG("Allocated channel (key %" PRIu64 ")", channel->key);
3bd1e081 1153
3bd1e081 1154end:
d2956687 1155 lttng_trace_chunk_put(trace_chunk);
3bd1e081 1156 return channel;
d2956687
JG
1157error:
1158 consumer_del_channel(channel);
1159 channel = NULL;
1160 goto end;
3bd1e081
MD
1161}
1162
1163/*
1164 * Add a channel to the global list protected by a mutex.
821fffb2 1165 *
b5a6470f 1166 * Always return 0 indicating success.
3bd1e081 1167 */
d8ef542d
MD
1168int consumer_add_channel(struct lttng_consumer_channel *channel,
1169 struct lttng_consumer_local_data *ctx)
3bd1e081 1170{
3bd1e081 1171 pthread_mutex_lock(&consumer_data.lock);
a9838785 1172 pthread_mutex_lock(&channel->lock);
ec6ea7d0 1173 pthread_mutex_lock(&channel->timer_lock);
c77fc10a 1174
b5a6470f
DG
1175 /*
1176 * This gives us a guarantee that the channel we are about to add to the
1177 * channel hash table will be unique. See this function comment on the why
1178 * we need to steel the channel key at this stage.
1179 */
1180 steal_channel_key(channel->key);
c77fc10a 1181
b5a6470f 1182 rcu_read_lock();
d88aee68 1183 lttng_ht_add_unique_u64(consumer_data.channel_ht, &channel->node);
5c3892a6
JG
1184 lttng_ht_add_u64(consumer_data.channels_by_session_id_ht,
1185 &channel->channels_by_session_id_ht_node);
6065ceec 1186 rcu_read_unlock();
d2956687 1187 channel->is_published = true;
b5a6470f 1188
ec6ea7d0 1189 pthread_mutex_unlock(&channel->timer_lock);
a9838785 1190 pthread_mutex_unlock(&channel->lock);
3bd1e081 1191 pthread_mutex_unlock(&consumer_data.lock);
702b1ea4 1192
b5a6470f 1193 if (channel->wait_fd != -1 && channel->type == CONSUMER_CHANNEL_TYPE_DATA) {
a0cbdd2e 1194 notify_channel_pipe(ctx, channel, -1, CONSUMER_CHANNEL_ADD);
d8ef542d 1195 }
b5a6470f
DG
1196
1197 return 0;
3bd1e081
MD
1198}
1199
1200/*
1201 * Allocate the pollfd structure and the local view of the out fds to avoid
1202 * doing a lookup in the linked list and concurrency issues when writing is
1203 * needed. Called with consumer_data.lock held.
1204 *
1205 * Returns the number of fds in the structures.
1206 */
ffe60014
DG
1207static int update_poll_array(struct lttng_consumer_local_data *ctx,
1208 struct pollfd **pollfd, struct lttng_consumer_stream **local_stream,
9a2fcf78 1209 struct lttng_ht *ht, int *nb_inactive_fd)
3bd1e081 1210{
3bd1e081 1211 int i = 0;
e4421fec
DG
1212 struct lttng_ht_iter iter;
1213 struct lttng_consumer_stream *stream;
3bd1e081 1214
ffe60014
DG
1215 assert(ctx);
1216 assert(ht);
1217 assert(pollfd);
1218 assert(local_stream);
1219
3bd1e081 1220 DBG("Updating poll fd array");
9a2fcf78 1221 *nb_inactive_fd = 0;
481d6c57 1222 rcu_read_lock();
43c34bc3 1223 cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) {
8994307f
DG
1224 /*
1225 * Only active streams with an active end point can be added to the
1226 * poll set and local stream storage of the thread.
1227 *
1228 * There is a potential race here for endpoint_status to be updated
1229 * just after the check. However, this is OK since the stream(s) will
1230 * be deleted once the thread is notified that the end point state has
1231 * changed where this function will be called back again.
9a2fcf78
JD
1232 *
1233 * We track the number of inactive FDs because they still need to be
1234 * closed by the polling thread after a wakeup on the data_pipe or
1235 * metadata_pipe.
8994307f 1236 */
d2956687 1237 if (stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) {
9a2fcf78 1238 (*nb_inactive_fd)++;
3bd1e081
MD
1239 continue;
1240 }
7972aab2
DG
1241 /*
1242 * This clobbers way too much the debug output. Uncomment that if you
1243 * need it for debugging purposes.
7972aab2 1244 */
e4421fec 1245 (*pollfd)[i].fd = stream->wait_fd;
3bd1e081 1246 (*pollfd)[i].events = POLLIN | POLLPRI;
e4421fec 1247 local_stream[i] = stream;
3bd1e081
MD
1248 i++;
1249 }
481d6c57 1250 rcu_read_unlock();
3bd1e081
MD
1251
1252 /*
50f8ae69 1253 * Insert the consumer_data_pipe at the end of the array and don't
3bd1e081
MD
1254 * increment i so nb_fd is the number of real FD.
1255 */
acdb9057 1256 (*pollfd)[i].fd = lttng_pipe_get_readfd(ctx->consumer_data_pipe);
509bb1cf 1257 (*pollfd)[i].events = POLLIN | POLLPRI;
02b3d176
DG
1258
1259 (*pollfd)[i + 1].fd = lttng_pipe_get_readfd(ctx->consumer_wakeup_pipe);
1260 (*pollfd)[i + 1].events = POLLIN | POLLPRI;
3bd1e081
MD
1261 return i;
1262}
1263
1264/*
84382d49
MD
1265 * Poll on the should_quit pipe and the command socket return -1 on
1266 * error, 1 if should exit, 0 if data is available on the command socket
3bd1e081
MD
1267 */
1268int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll)
1269{
1270 int num_rdy;
1271
88f2b785 1272restart:
3bd1e081
MD
1273 num_rdy = poll(consumer_sockpoll, 2, -1);
1274 if (num_rdy == -1) {
88f2b785
MD
1275 /*
1276 * Restart interrupted system call.
1277 */
1278 if (errno == EINTR) {
1279 goto restart;
1280 }
7a57cf92 1281 PERROR("Poll error");
84382d49 1282 return -1;
3bd1e081 1283 }
509bb1cf 1284 if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) {
3bd1e081 1285 DBG("consumer_should_quit wake up");
84382d49 1286 return 1;
3bd1e081
MD
1287 }
1288 return 0;
3bd1e081
MD
1289}
1290
1291/*
1292 * Set the error socket.
1293 */
ffe60014
DG
1294void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx,
1295 int sock)
3bd1e081
MD
1296{
1297 ctx->consumer_error_socket = sock;
1298}
1299
1300/*
1301 * Set the command socket path.
1302 */
3bd1e081
MD
1303void lttng_consumer_set_command_sock_path(
1304 struct lttng_consumer_local_data *ctx, char *sock)
1305{
1306 ctx->consumer_command_sock_path = sock;
1307}
1308
1309/*
1310 * Send return code to the session daemon.
1311 * If the socket is not defined, we return 0, it is not a fatal error
1312 */
ffe60014 1313int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd)
3bd1e081
MD
1314{
1315 if (ctx->consumer_error_socket > 0) {
1316 return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd,
1317 sizeof(enum lttcomm_sessiond_command));
1318 }
1319
1320 return 0;
1321}
1322
1323/*
228b5bf7
DG
1324 * Close all the tracefiles and stream fds and MUST be called when all
1325 * instances are destroyed i.e. when all threads were joined and are ended.
3bd1e081
MD
1326 */
1327void lttng_consumer_cleanup(void)
1328{
e4421fec 1329 struct lttng_ht_iter iter;
ffe60014 1330 struct lttng_consumer_channel *channel;
e10aec8f 1331 unsigned int trace_chunks_left;
6065ceec
DG
1332
1333 rcu_read_lock();
3bd1e081 1334
ffe60014
DG
1335 cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, channel,
1336 node.node) {
702b1ea4 1337 consumer_del_channel(channel);
3bd1e081 1338 }
6065ceec
DG
1339
1340 rcu_read_unlock();
d6ce1df2 1341
d6ce1df2 1342 lttng_ht_destroy(consumer_data.channel_ht);
5c3892a6 1343 lttng_ht_destroy(consumer_data.channels_by_session_id_ht);
228b5bf7
DG
1344
1345 cleanup_relayd_ht();
1346
d8ef542d
MD
1347 lttng_ht_destroy(consumer_data.stream_per_chan_id_ht);
1348
228b5bf7
DG
1349 /*
1350 * This HT contains streams that are freed by either the metadata thread or
1351 * the data thread so we do *nothing* on the hash table and simply destroy
1352 * it.
1353 */
1354 lttng_ht_destroy(consumer_data.stream_list_ht);
28cc88f3 1355
e10aec8f
MD
1356 /*
1357 * Trace chunks in the registry may still exist if the session
1358 * daemon has encountered an internal error and could not
1359 * tear down its sessions and/or trace chunks properly.
1360 *
1361 * Release the session daemon's implicit reference to any remaining
1362 * trace chunk and print an error if any trace chunk was found. Note
1363 * that there are _no_ legitimate cases for trace chunks to be left,
1364 * it is a leak. However, it can happen following a crash of the
1365 * session daemon and not emptying the registry would cause an assertion
1366 * to hit.
1367 */
1368 trace_chunks_left = lttng_trace_chunk_registry_put_each_chunk(
1369 consumer_data.chunk_registry);
1370 if (trace_chunks_left) {
1371 ERR("%u trace chunks are leaked by lttng-consumerd. "
1372 "This can be caused by an internal error of the session daemon.",
1373 trace_chunks_left);
1374 }
1375 /* Run all callbacks freeing each chunk. */
1376 rcu_barrier();
28cc88f3 1377 lttng_trace_chunk_registry_destroy(consumer_data.chunk_registry);
3bd1e081
MD
1378}
1379
1380/*
1381 * Called from signal handler.
1382 */
1383void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx)
1384{
6cd525e8
MD
1385 ssize_t ret;
1386
10211f5c 1387 CMM_STORE_SHARED(consumer_quit, 1);
6cd525e8
MD
1388 ret = lttng_write(ctx->consumer_should_quit[1], "4", 1);
1389 if (ret < 1) {
7a57cf92 1390 PERROR("write consumer quit");
3bd1e081 1391 }
ab1027f4
DG
1392
1393 DBG("Consumer flag that it should quit");
3bd1e081
MD
1394}
1395
5199ffc4
JG
1396
1397/*
1398 * Flush pending writes to trace output disk file.
1399 */
1400static
00e2e675
DG
1401void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream,
1402 off_t orig_offset)
3bd1e081 1403{
c7a78aab 1404 int ret;
3bd1e081
MD
1405 int outfd = stream->out_fd;
1406
1407 /*
1408 * This does a blocking write-and-wait on any page that belongs to the
1409 * subbuffer prior to the one we just wrote.
1410 * Don't care about error values, as these are just hints and ways to
1411 * limit the amount of page cache used.
1412 */
ffe60014 1413 if (orig_offset < stream->max_sb_size) {
3bd1e081
MD
1414 return;
1415 }
ffe60014
DG
1416 lttng_sync_file_range(outfd, orig_offset - stream->max_sb_size,
1417 stream->max_sb_size,
3bd1e081
MD
1418 SYNC_FILE_RANGE_WAIT_BEFORE
1419 | SYNC_FILE_RANGE_WRITE
1420 | SYNC_FILE_RANGE_WAIT_AFTER);
1421 /*
1422 * Give hints to the kernel about how we access the file:
1423 * POSIX_FADV_DONTNEED : we won't re-access data in a near future after
1424 * we write it.
1425 *
1426 * We need to call fadvise again after the file grows because the
1427 * kernel does not seem to apply fadvise to non-existing parts of the
1428 * file.
1429 *
1430 * Call fadvise _after_ having waited for the page writeback to
1431 * complete because the dirty page writeback semantic is not well
1432 * defined. So it can be expected to lead to lower throughput in
1433 * streaming.
1434 */
c7a78aab 1435 ret = posix_fadvise(outfd, orig_offset - stream->max_sb_size,
ffe60014 1436 stream->max_sb_size, POSIX_FADV_DONTNEED);
a0d0e127 1437 if (ret && ret != -ENOSYS) {
a74a5f4a
JG
1438 errno = ret;
1439 PERROR("posix_fadvise on fd %i", outfd);
c7a78aab 1440 }
3bd1e081
MD
1441}
1442
1443/*
1444 * Initialise the necessary environnement :
1445 * - create a new context
1446 * - create the poll_pipe
1447 * - create the should_quit pipe (for signal handler)
1448 * - create the thread pipe (for splice)
1449 *
1450 * Takes a function pointer as argument, this function is called when data is
1451 * available on a buffer. This function is responsible to do the
1452 * kernctl_get_next_subbuf, read the data with mmap or splice depending on the
1453 * buffer configuration and then kernctl_put_next_subbuf at the end.
1454 *
1455 * Returns a pointer to the new context or NULL on error.
1456 */
1457struct lttng_consumer_local_data *lttng_consumer_create(
1458 enum lttng_consumer_type type,
4078b776 1459 ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream,
d41f73b7 1460 struct lttng_consumer_local_data *ctx),
3bd1e081
MD
1461 int (*recv_channel)(struct lttng_consumer_channel *channel),
1462 int (*recv_stream)(struct lttng_consumer_stream *stream),
30319bcb 1463 int (*update_stream)(uint64_t stream_key, uint32_t state))
3bd1e081 1464{
d8ef542d 1465 int ret;
3bd1e081
MD
1466 struct lttng_consumer_local_data *ctx;
1467
1468 assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN ||
1469 consumer_data.type == type);
1470 consumer_data.type = type;
1471
effcf122 1472 ctx = zmalloc(sizeof(struct lttng_consumer_local_data));
3bd1e081 1473 if (ctx == NULL) {
7a57cf92 1474 PERROR("allocating context");
3bd1e081
MD
1475 goto error;
1476 }
1477
1478 ctx->consumer_error_socket = -1;
331744e3 1479 ctx->consumer_metadata_socket = -1;
75d83e50 1480 pthread_mutex_init(&ctx->metadata_socket_lock, NULL);
3bd1e081
MD
1481 /* assign the callbacks */
1482 ctx->on_buffer_ready = buffer_ready;
1483 ctx->on_recv_channel = recv_channel;
1484 ctx->on_recv_stream = recv_stream;
1485 ctx->on_update_stream = update_stream;
1486
acdb9057
DG
1487 ctx->consumer_data_pipe = lttng_pipe_open(0);
1488 if (!ctx->consumer_data_pipe) {
3bd1e081
MD
1489 goto error_poll_pipe;
1490 }
1491
02b3d176
DG
1492 ctx->consumer_wakeup_pipe = lttng_pipe_open(0);
1493 if (!ctx->consumer_wakeup_pipe) {
1494 goto error_wakeup_pipe;
1495 }
1496
3bd1e081
MD
1497 ret = pipe(ctx->consumer_should_quit);
1498 if (ret < 0) {
7a57cf92 1499 PERROR("Error creating recv pipe");
3bd1e081
MD
1500 goto error_quit_pipe;
1501 }
1502
d8ef542d
MD
1503 ret = pipe(ctx->consumer_channel_pipe);
1504 if (ret < 0) {
1505 PERROR("Error creating channel pipe");
1506 goto error_channel_pipe;
1507 }
1508
13886d2d
DG
1509 ctx->consumer_metadata_pipe = lttng_pipe_open(0);
1510 if (!ctx->consumer_metadata_pipe) {
fb3a43a9
DG
1511 goto error_metadata_pipe;
1512 }
3bd1e081 1513
e9404c27
JG
1514 ctx->channel_monitor_pipe = -1;
1515
fb3a43a9 1516 return ctx;
3bd1e081 1517
fb3a43a9 1518error_metadata_pipe:
d8ef542d
MD
1519 utils_close_pipe(ctx->consumer_channel_pipe);
1520error_channel_pipe:
d8ef542d 1521 utils_close_pipe(ctx->consumer_should_quit);
3bd1e081 1522error_quit_pipe:
02b3d176
DG
1523 lttng_pipe_destroy(ctx->consumer_wakeup_pipe);
1524error_wakeup_pipe:
acdb9057 1525 lttng_pipe_destroy(ctx->consumer_data_pipe);
3bd1e081
MD
1526error_poll_pipe:
1527 free(ctx);
1528error:
1529 return NULL;
1530}
1531
282dadbc
MD
1532/*
1533 * Iterate over all streams of the hashtable and free them properly.
1534 */
1535static void destroy_data_stream_ht(struct lttng_ht *ht)
1536{
1537 struct lttng_ht_iter iter;
1538 struct lttng_consumer_stream *stream;
1539
1540 if (ht == NULL) {
1541 return;
1542 }
1543
1544 rcu_read_lock();
1545 cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) {
1546 /*
1547 * Ignore return value since we are currently cleaning up so any error
1548 * can't be handled.
1549 */
1550 (void) consumer_del_stream(stream, ht);
1551 }
1552 rcu_read_unlock();
1553
1554 lttng_ht_destroy(ht);
1555}
1556
1557/*
1558 * Iterate over all streams of the metadata hashtable and free them
1559 * properly.
1560 */
1561static void destroy_metadata_stream_ht(struct lttng_ht *ht)
1562{
1563 struct lttng_ht_iter iter;
1564 struct lttng_consumer_stream *stream;
1565
1566 if (ht == NULL) {
1567 return;
1568 }
1569
1570 rcu_read_lock();
1571 cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) {
1572 /*
1573 * Ignore return value since we are currently cleaning up so any error
1574 * can't be handled.
1575 */
1576 (void) consumer_del_metadata_stream(stream, ht);
1577 }
1578 rcu_read_unlock();
1579
1580 lttng_ht_destroy(ht);
1581}
1582
3bd1e081
MD
1583/*
1584 * Close all fds associated with the instance and free the context.
1585 */
1586void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx)
1587{
4c462e79
MD
1588 int ret;
1589
ab1027f4
DG
1590 DBG("Consumer destroying it. Closing everything.");
1591
4f2e75b9
DG
1592 if (!ctx) {
1593 return;
1594 }
1595
282dadbc
MD
1596 destroy_data_stream_ht(data_ht);
1597 destroy_metadata_stream_ht(metadata_ht);
1598
4c462e79
MD
1599 ret = close(ctx->consumer_error_socket);
1600 if (ret) {
1601 PERROR("close");
1602 }
331744e3
JD
1603 ret = close(ctx->consumer_metadata_socket);
1604 if (ret) {
1605 PERROR("close");
1606 }
d8ef542d 1607 utils_close_pipe(ctx->consumer_channel_pipe);
acdb9057 1608 lttng_pipe_destroy(ctx->consumer_data_pipe);
13886d2d 1609 lttng_pipe_destroy(ctx->consumer_metadata_pipe);
02b3d176 1610 lttng_pipe_destroy(ctx->consumer_wakeup_pipe);
d8ef542d 1611 utils_close_pipe(ctx->consumer_should_quit);
fb3a43a9 1612
3bd1e081
MD
1613 unlink(ctx->consumer_command_sock_path);
1614 free(ctx);
1615}
1616
6197aea7
DG
1617/*
1618 * Write the metadata stream id on the specified file descriptor.
1619 */
1620static int write_relayd_metadata_id(int fd,
1621 struct lttng_consumer_stream *stream,
239f61af 1622 unsigned long padding)
6197aea7 1623{
6cd525e8 1624 ssize_t ret;
1d4dfdef 1625 struct lttcomm_relayd_metadata_payload hdr;
6197aea7 1626
1d4dfdef
DG
1627 hdr.stream_id = htobe64(stream->relayd_stream_id);
1628 hdr.padding_size = htobe32(padding);
6cd525e8
MD
1629 ret = lttng_write(fd, (void *) &hdr, sizeof(hdr));
1630 if (ret < sizeof(hdr)) {
d7b75ec8 1631 /*
6f04ed72 1632 * This error means that the fd's end is closed so ignore the PERROR
d7b75ec8
DG
1633 * not to clubber the error output since this can happen in a normal
1634 * code path.
1635 */
1636 if (errno != EPIPE) {
1637 PERROR("write metadata stream id");
1638 }
1639 DBG3("Consumer failed to write relayd metadata id (errno: %d)", errno);
534d2592
DG
1640 /*
1641 * Set ret to a negative value because if ret != sizeof(hdr), we don't
1642 * handle writting the missing part so report that as an error and
1643 * don't lie to the caller.
1644 */
1645 ret = -1;
6197aea7
DG
1646 goto end;
1647 }
1d4dfdef
DG
1648 DBG("Metadata stream id %" PRIu64 " with padding %lu written before data",
1649 stream->relayd_stream_id, padding);
6197aea7
DG
1650
1651end:
6cd525e8 1652 return (int) ret;
6197aea7
DG
1653}
1654
3bd1e081 1655/*
09e26845
DG
1656 * Mmap the ring buffer, read it and write the data to the tracefile. This is a
1657 * core function for writing trace buffers to either the local filesystem or
1658 * the network.
1659 *
d2956687 1660 * It must be called with the stream and the channel lock held.
79d4ffb7 1661 *
09e26845 1662 * Careful review MUST be put if any changes occur!
3bd1e081
MD
1663 *
1664 * Returns the number of bytes written
1665 */
4078b776 1666ssize_t lttng_consumer_on_read_subbuffer_mmap(
3bd1e081 1667 struct lttng_consumer_local_data *ctx,
1d4dfdef 1668 struct lttng_consumer_stream *stream, unsigned long len,
309167d2 1669 unsigned long padding,
50adc264 1670 struct ctf_packet_index *index)
3bd1e081 1671{
f02e1e8a 1672 unsigned long mmap_offset;
ffe60014 1673 void *mmap_base;
994ab360 1674 ssize_t ret = 0;
f02e1e8a
DG
1675 off_t orig_offset = stream->out_fd_offset;
1676 /* Default is on the disk */
1677 int outfd = stream->out_fd;
f02e1e8a 1678 struct consumer_relayd_sock_pair *relayd = NULL;
8994307f 1679 unsigned int relayd_hang_up = 0;
f02e1e8a
DG
1680
1681 /* RCU lock for the relayd pointer */
1682 rcu_read_lock();
7fd975c5 1683 assert(stream->net_seq_idx != (uint64_t) -1ULL ||
948411cd 1684 stream->trace_chunk);
d2956687 1685
f02e1e8a 1686 /* Flag that the current stream if set for network streaming. */
da009f2c 1687 if (stream->net_seq_idx != (uint64_t) -1ULL) {
f02e1e8a
DG
1688 relayd = consumer_find_relayd(stream->net_seq_idx);
1689 if (relayd == NULL) {
56591bac 1690 ret = -EPIPE;
f02e1e8a
DG
1691 goto end;
1692 }
1693 }
1694
1695 /* get the offset inside the fd to mmap */
3bd1e081
MD
1696 switch (consumer_data.type) {
1697 case LTTNG_CONSUMER_KERNEL:
ffe60014 1698 mmap_base = stream->mmap_base;
f02e1e8a 1699 ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset);
994ab360 1700 if (ret < 0) {
56591bac 1701 PERROR("tracer ctl get_mmap_read_offset");
56591bac
MD
1702 goto end;
1703 }
f02e1e8a 1704 break;
7753dea8
MD
1705 case LTTNG_CONSUMER32_UST:
1706 case LTTNG_CONSUMER64_UST:
ffe60014
DG
1707 mmap_base = lttng_ustctl_get_mmap_base(stream);
1708 if (!mmap_base) {
1709 ERR("read mmap get mmap base for stream %s", stream->name);
994ab360 1710 ret = -EPERM;
ffe60014
DG
1711 goto end;
1712 }
1713 ret = lttng_ustctl_get_mmap_read_offset(stream, &mmap_offset);
56591bac
MD
1714 if (ret != 0) {
1715 PERROR("tracer ctl get_mmap_read_offset");
994ab360 1716 ret = -EINVAL;
56591bac
MD
1717 goto end;
1718 }
f02e1e8a 1719 break;
3bd1e081
MD
1720 default:
1721 ERR("Unknown consumer_data type");
1722 assert(0);
1723 }
b9182dd9 1724
f02e1e8a
DG
1725 /* Handle stream on the relayd if the output is on the network */
1726 if (relayd) {
1727 unsigned long netlen = len;
1728
1729 /*
1730 * Lock the control socket for the complete duration of the function
1731 * since from this point on we will use the socket.
1732 */
1733 if (stream->metadata_flag) {
1734 /* Metadata requires the control socket. */
1735 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
93ec662e
JD
1736 if (stream->reset_metadata_flag) {
1737 ret = relayd_reset_metadata(&relayd->control_sock,
1738 stream->relayd_stream_id,
1739 stream->metadata_version);
1740 if (ret < 0) {
1741 relayd_hang_up = 1;
1742 goto write_error;
1743 }
1744 stream->reset_metadata_flag = 0;
1745 }
1d4dfdef 1746 netlen += sizeof(struct lttcomm_relayd_metadata_payload);
f02e1e8a
DG
1747 }
1748
1d4dfdef 1749 ret = write_relayd_stream_header(stream, netlen, padding, relayd);
994ab360
DG
1750 if (ret < 0) {
1751 relayd_hang_up = 1;
1752 goto write_error;
1753 }
1754 /* Use the returned socket. */
1755 outfd = ret;
f02e1e8a 1756
994ab360
DG
1757 /* Write metadata stream id before payload */
1758 if (stream->metadata_flag) {
239f61af 1759 ret = write_relayd_metadata_id(outfd, stream, padding);
994ab360 1760 if (ret < 0) {
8994307f
DG
1761 relayd_hang_up = 1;
1762 goto write_error;
1763 }
f02e1e8a 1764 }
1d4dfdef
DG
1765 } else {
1766 /* No streaming, we have to set the len with the full padding */
1767 len += padding;
1624d5b7 1768
93ec662e
JD
1769 if (stream->metadata_flag && stream->reset_metadata_flag) {
1770 ret = utils_truncate_stream_file(stream->out_fd, 0);
1771 if (ret < 0) {
1772 ERR("Reset metadata file");
1773 goto end;
1774 }
1775 stream->reset_metadata_flag = 0;
1776 }
1777
1624d5b7
JD
1778 /*
1779 * Check if we need to change the tracefile before writing the packet.
1780 */
1781 if (stream->chan->tracefile_size > 0 &&
1782 (stream->tracefile_size_current + len) >
1783 stream->chan->tracefile_size) {
d2956687
JG
1784 ret = consumer_stream_rotate_output_files(stream);
1785 if (ret) {
1624d5b7
JD
1786 goto end;
1787 }
309167d2 1788 outfd = stream->out_fd;
a1ae300f 1789 orig_offset = 0;
1624d5b7
JD
1790 }
1791 stream->tracefile_size_current += len;
309167d2
JD
1792 if (index) {
1793 index->offset = htobe64(stream->out_fd_offset);
1794 }
f02e1e8a
DG
1795 }
1796
d02b8372
DG
1797 /*
1798 * This call guarantee that len or less is returned. It's impossible to
1799 * receive a ret value that is bigger than len.
1800 */
1801 ret = lttng_write(outfd, mmap_base + mmap_offset, len);
1802 DBG("Consumer mmap write() ret %zd (len %lu)", ret, len);
1803 if (ret < 0 || ((size_t) ret != len)) {
1804 /*
1805 * Report error to caller if nothing was written else at least send the
1806 * amount written.
1807 */
1808 if (ret < 0) {
994ab360 1809 ret = -errno;
f02e1e8a 1810 }
994ab360 1811 relayd_hang_up = 1;
f02e1e8a 1812
d02b8372 1813 /* Socket operation failed. We consider the relayd dead */
fcf0f774 1814 if (errno == EPIPE) {
d02b8372
DG
1815 /*
1816 * This is possible if the fd is closed on the other side
1817 * (outfd) or any write problem. It can be verbose a bit for a
1818 * normal execution if for instance the relayd is stopped
1819 * abruptly. This can happen so set this to a DBG statement.
1820 */
1821 DBG("Consumer mmap write detected relayd hang up");
994ab360
DG
1822 } else {
1823 /* Unhandled error, print it and stop function right now. */
1824 PERROR("Error in write mmap (ret %zd != len %lu)", ret, len);
f02e1e8a 1825 }
994ab360 1826 goto write_error;
d02b8372
DG
1827 }
1828 stream->output_written += ret;
d02b8372
DG
1829
1830 /* This call is useless on a socket so better save a syscall. */
1831 if (!relayd) {
1832 /* This won't block, but will start writeout asynchronously */
1833 lttng_sync_file_range(outfd, stream->out_fd_offset, len,
1834 SYNC_FILE_RANGE_WRITE);
1835 stream->out_fd_offset += len;
f5dbe415 1836 lttng_consumer_sync_trace_file(stream, orig_offset);
f02e1e8a 1837 }
f02e1e8a 1838
8994307f
DG
1839write_error:
1840 /*
1841 * This is a special case that the relayd has closed its socket. Let's
1842 * cleanup the relayd object and all associated streams.
1843 */
1844 if (relayd && relayd_hang_up) {
9276e5c8
JR
1845 ERR("Relayd hangup. Cleaning up relayd %" PRIu64".", relayd->net_seq_idx);
1846 lttng_consumer_cleanup_relayd(relayd);
8994307f
DG
1847 }
1848
f02e1e8a
DG
1849end:
1850 /* Unlock only if ctrl socket used */
1851 if (relayd && stream->metadata_flag) {
1852 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
1853 }
1854
1855 rcu_read_unlock();
994ab360 1856 return ret;
3bd1e081
MD
1857}
1858
1859/*
1860 * Splice the data from the ring buffer to the tracefile.
1861 *
79d4ffb7
DG
1862 * It must be called with the stream lock held.
1863 *
3bd1e081
MD
1864 * Returns the number of bytes spliced.
1865 */
4078b776 1866ssize_t lttng_consumer_on_read_subbuffer_splice(
3bd1e081 1867 struct lttng_consumer_local_data *ctx,
1d4dfdef 1868 struct lttng_consumer_stream *stream, unsigned long len,
309167d2 1869 unsigned long padding,
50adc264 1870 struct ctf_packet_index *index)
3bd1e081 1871{
f02e1e8a
DG
1872 ssize_t ret = 0, written = 0, ret_splice = 0;
1873 loff_t offset = 0;
1874 off_t orig_offset = stream->out_fd_offset;
1875 int fd = stream->wait_fd;
1876 /* Default is on the disk */
1877 int outfd = stream->out_fd;
f02e1e8a 1878 struct consumer_relayd_sock_pair *relayd = NULL;
fb3a43a9 1879 int *splice_pipe;
8994307f 1880 unsigned int relayd_hang_up = 0;
f02e1e8a 1881
3bd1e081
MD
1882 switch (consumer_data.type) {
1883 case LTTNG_CONSUMER_KERNEL:
f02e1e8a 1884 break;
7753dea8
MD
1885 case LTTNG_CONSUMER32_UST:
1886 case LTTNG_CONSUMER64_UST:
f02e1e8a 1887 /* Not supported for user space tracing */
3bd1e081
MD
1888 return -ENOSYS;
1889 default:
1890 ERR("Unknown consumer_data type");
1891 assert(0);
3bd1e081
MD
1892 }
1893
f02e1e8a
DG
1894 /* RCU lock for the relayd pointer */
1895 rcu_read_lock();
1896
1897 /* Flag that the current stream if set for network streaming. */
da009f2c 1898 if (stream->net_seq_idx != (uint64_t) -1ULL) {
f02e1e8a
DG
1899 relayd = consumer_find_relayd(stream->net_seq_idx);
1900 if (relayd == NULL) {
ad0b0d23 1901 written = -ret;
f02e1e8a
DG
1902 goto end;
1903 }
1904 }
a2361a61 1905 splice_pipe = stream->splice_pipe;
fb3a43a9 1906
f02e1e8a 1907 /* Write metadata stream id before payload */
1d4dfdef 1908 if (relayd) {
ad0b0d23 1909 unsigned long total_len = len;
f02e1e8a 1910
1d4dfdef
DG
1911 if (stream->metadata_flag) {
1912 /*
1913 * Lock the control socket for the complete duration of the function
1914 * since from this point on we will use the socket.
1915 */
1916 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
1917
93ec662e
JD
1918 if (stream->reset_metadata_flag) {
1919 ret = relayd_reset_metadata(&relayd->control_sock,
1920 stream->relayd_stream_id,
1921 stream->metadata_version);
1922 if (ret < 0) {
1923 relayd_hang_up = 1;
1924 goto write_error;
1925 }
1926 stream->reset_metadata_flag = 0;
1927 }
239f61af 1928 ret = write_relayd_metadata_id(splice_pipe[1], stream,
1d4dfdef
DG
1929 padding);
1930 if (ret < 0) {
1931 written = ret;
ad0b0d23
DG
1932 relayd_hang_up = 1;
1933 goto write_error;
1d4dfdef
DG
1934 }
1935
1936 total_len += sizeof(struct lttcomm_relayd_metadata_payload);
1937 }
1938
1939 ret = write_relayd_stream_header(stream, total_len, padding, relayd);
ad0b0d23
DG
1940 if (ret < 0) {
1941 written = ret;
1942 relayd_hang_up = 1;
1943 goto write_error;
f02e1e8a 1944 }
ad0b0d23
DG
1945 /* Use the returned socket. */
1946 outfd = ret;
1d4dfdef
DG
1947 } else {
1948 /* No streaming, we have to set the len with the full padding */
1949 len += padding;
1624d5b7 1950
93ec662e
JD
1951 if (stream->metadata_flag && stream->reset_metadata_flag) {
1952 ret = utils_truncate_stream_file(stream->out_fd, 0);
1953 if (ret < 0) {
1954 ERR("Reset metadata file");
1955 goto end;
1956 }
1957 stream->reset_metadata_flag = 0;
1958 }
1624d5b7
JD
1959 /*
1960 * Check if we need to change the tracefile before writing the packet.
1961 */
1962 if (stream->chan->tracefile_size > 0 &&
1963 (stream->tracefile_size_current + len) >
1964 stream->chan->tracefile_size) {
d2956687 1965 ret = consumer_stream_rotate_output_files(stream);
1624d5b7 1966 if (ret < 0) {
ad0b0d23 1967 written = ret;
1624d5b7
JD
1968 goto end;
1969 }
309167d2 1970 outfd = stream->out_fd;
a1ae300f 1971 orig_offset = 0;
1624d5b7
JD
1972 }
1973 stream->tracefile_size_current += len;
309167d2 1974 index->offset = htobe64(stream->out_fd_offset);
f02e1e8a
DG
1975 }
1976
1977 while (len > 0) {
1d4dfdef
DG
1978 DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)",
1979 (unsigned long)offset, len, fd, splice_pipe[1]);
fb3a43a9 1980 ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len,
f02e1e8a
DG
1981 SPLICE_F_MOVE | SPLICE_F_MORE);
1982 DBG("splice chan to pipe, ret %zd", ret_splice);
1983 if (ret_splice < 0) {
d02b8372 1984 ret = errno;
ad0b0d23 1985 written = -ret;
d02b8372 1986 PERROR("Error in relay splice");
f02e1e8a
DG
1987 goto splice_error;
1988 }
1989
1990 /* Handle stream on the relayd if the output is on the network */
ad0b0d23
DG
1991 if (relayd && stream->metadata_flag) {
1992 size_t metadata_payload_size =
1993 sizeof(struct lttcomm_relayd_metadata_payload);
1994
1995 /* Update counter to fit the spliced data */
1996 ret_splice += metadata_payload_size;
1997 len += metadata_payload_size;
1998 /*
1999 * We do this so the return value can match the len passed as
2000 * argument to this function.
2001 */
2002 written -= metadata_payload_size;
f02e1e8a
DG
2003 }
2004
2005 /* Splice data out */
fb3a43a9 2006 ret_splice = splice(splice_pipe[0], NULL, outfd, NULL,
f02e1e8a 2007 ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE);
a2361a61
JD
2008 DBG("Consumer splice pipe to file (out_fd: %d), ret %zd",
2009 outfd, ret_splice);
f02e1e8a 2010 if (ret_splice < 0) {
d02b8372 2011 ret = errno;
ad0b0d23
DG
2012 written = -ret;
2013 relayd_hang_up = 1;
2014 goto write_error;
f02e1e8a 2015 } else if (ret_splice > len) {
d02b8372
DG
2016 /*
2017 * We don't expect this code path to be executed but you never know
2018 * so this is an extra protection agains a buggy splice().
2019 */
f02e1e8a 2020 ret = errno;
ad0b0d23 2021 written += ret_splice;
d02b8372
DG
2022 PERROR("Wrote more data than requested %zd (len: %lu)", ret_splice,
2023 len);
f02e1e8a 2024 goto splice_error;
d02b8372
DG
2025 } else {
2026 /* All good, update current len and continue. */
2027 len -= ret_splice;
f02e1e8a 2028 }
f02e1e8a
DG
2029
2030 /* This call is useless on a socket so better save a syscall. */
2031 if (!relayd) {
2032 /* This won't block, but will start writeout asynchronously */
2033 lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice,
2034 SYNC_FILE_RANGE_WRITE);
2035 stream->out_fd_offset += ret_splice;
2036 }
e5d1a9b3 2037 stream->output_written += ret_splice;
f02e1e8a
DG
2038 written += ret_splice;
2039 }
f5dbe415
JG
2040 if (!relayd) {
2041 lttng_consumer_sync_trace_file(stream, orig_offset);
2042 }
f02e1e8a
DG
2043 goto end;
2044
8994307f
DG
2045write_error:
2046 /*
2047 * This is a special case that the relayd has closed its socket. Let's
2048 * cleanup the relayd object and all associated streams.
2049 */
2050 if (relayd && relayd_hang_up) {
9276e5c8
JR
2051 ERR("Relayd hangup. Cleaning up relayd %" PRIu64".", relayd->net_seq_idx);
2052 lttng_consumer_cleanup_relayd(relayd);
8994307f
DG
2053 /* Skip splice error so the consumer does not fail */
2054 goto end;
2055 }
2056
f02e1e8a
DG
2057splice_error:
2058 /* send the appropriate error description to sessiond */
2059 switch (ret) {
f02e1e8a 2060 case EINVAL:
f73fabfd 2061 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL);
f02e1e8a
DG
2062 break;
2063 case ENOMEM:
f73fabfd 2064 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM);
f02e1e8a
DG
2065 break;
2066 case ESPIPE:
f73fabfd 2067 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE);
f02e1e8a
DG
2068 break;
2069 }
2070
2071end:
2072 if (relayd && stream->metadata_flag) {
2073 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
2074 }
2075
2076 rcu_read_unlock();
2077 return written;
3bd1e081
MD
2078}
2079
15055ce5
JD
2080/*
2081 * Sample the snapshot positions for a specific fd
2082 *
2083 * Returns 0 on success, < 0 on error
2084 */
2085int lttng_consumer_sample_snapshot_positions(struct lttng_consumer_stream *stream)
2086{
2087 switch (consumer_data.type) {
2088 case LTTNG_CONSUMER_KERNEL:
2089 return lttng_kconsumer_sample_snapshot_positions(stream);
2090 case LTTNG_CONSUMER32_UST:
2091 case LTTNG_CONSUMER64_UST:
2092 return lttng_ustconsumer_sample_snapshot_positions(stream);
2093 default:
2094 ERR("Unknown consumer_data type");
2095 assert(0);
2096 return -ENOSYS;
2097 }
2098}
3bd1e081
MD
2099/*
2100 * Take a snapshot for a specific fd
2101 *
2102 * Returns 0 on success, < 0 on error
2103 */
ffe60014 2104int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream)
3bd1e081
MD
2105{
2106 switch (consumer_data.type) {
2107 case LTTNG_CONSUMER_KERNEL:
ffe60014 2108 return lttng_kconsumer_take_snapshot(stream);
7753dea8
MD
2109 case LTTNG_CONSUMER32_UST:
2110 case LTTNG_CONSUMER64_UST:
ffe60014 2111 return lttng_ustconsumer_take_snapshot(stream);
3bd1e081
MD
2112 default:
2113 ERR("Unknown consumer_data type");
2114 assert(0);
2115 return -ENOSYS;
2116 }
3bd1e081
MD
2117}
2118
2119/*
2120 * Get the produced position
2121 *
2122 * Returns 0 on success, < 0 on error
2123 */
ffe60014 2124int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream,
3bd1e081
MD
2125 unsigned long *pos)
2126{
2127 switch (consumer_data.type) {
2128 case LTTNG_CONSUMER_KERNEL:
ffe60014 2129 return lttng_kconsumer_get_produced_snapshot(stream, pos);
7753dea8
MD
2130 case LTTNG_CONSUMER32_UST:
2131 case LTTNG_CONSUMER64_UST:
ffe60014 2132 return lttng_ustconsumer_get_produced_snapshot(stream, pos);
3bd1e081
MD
2133 default:
2134 ERR("Unknown consumer_data type");
2135 assert(0);
2136 return -ENOSYS;
2137 }
2138}
2139
15055ce5
JD
2140/*
2141 * Get the consumed position (free-running counter position in bytes).
2142 *
2143 * Returns 0 on success, < 0 on error
2144 */
2145int lttng_consumer_get_consumed_snapshot(struct lttng_consumer_stream *stream,
2146 unsigned long *pos)
2147{
2148 switch (consumer_data.type) {
2149 case LTTNG_CONSUMER_KERNEL:
2150 return lttng_kconsumer_get_consumed_snapshot(stream, pos);
2151 case LTTNG_CONSUMER32_UST:
2152 case LTTNG_CONSUMER64_UST:
2153 return lttng_ustconsumer_get_consumed_snapshot(stream, pos);
2154 default:
2155 ERR("Unknown consumer_data type");
2156 assert(0);
2157 return -ENOSYS;
2158 }
2159}
2160
3bd1e081
MD
2161int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx,
2162 int sock, struct pollfd *consumer_sockpoll)
2163{
2164 switch (consumer_data.type) {
2165 case LTTNG_CONSUMER_KERNEL:
2166 return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll);
7753dea8
MD
2167 case LTTNG_CONSUMER32_UST:
2168 case LTTNG_CONSUMER64_UST:
3bd1e081
MD
2169 return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll);
2170 default:
2171 ERR("Unknown consumer_data type");
2172 assert(0);
2173 return -ENOSYS;
2174 }
2175}
2176
6d574024 2177void lttng_consumer_close_all_metadata(void)
d88aee68
DG
2178{
2179 switch (consumer_data.type) {
2180 case LTTNG_CONSUMER_KERNEL:
2181 /*
2182 * The Kernel consumer has a different metadata scheme so we don't
2183 * close anything because the stream will be closed by the session
2184 * daemon.
2185 */
2186 break;
2187 case LTTNG_CONSUMER32_UST:
2188 case LTTNG_CONSUMER64_UST:
2189 /*
2190 * Close all metadata streams. The metadata hash table is passed and
2191 * this call iterates over it by closing all wakeup fd. This is safe
2192 * because at this point we are sure that the metadata producer is
2193 * either dead or blocked.
2194 */
6d574024 2195 lttng_ustconsumer_close_all_metadata(metadata_ht);
d88aee68
DG
2196 break;
2197 default:
2198 ERR("Unknown consumer_data type");
2199 assert(0);
2200 }
2201}
2202
fb3a43a9
DG
2203/*
2204 * Clean up a metadata stream and free its memory.
2205 */
e316aad5
DG
2206void consumer_del_metadata_stream(struct lttng_consumer_stream *stream,
2207 struct lttng_ht *ht)
fb3a43a9 2208{
a6ef8ee6
JG
2209 struct lttng_consumer_channel *channel = NULL;
2210 bool free_channel = false;
fb3a43a9
DG
2211
2212 assert(stream);
2213 /*
2214 * This call should NEVER receive regular stream. It must always be
2215 * metadata stream and this is crucial for data structure synchronization.
2216 */
2217 assert(stream->metadata_flag);
2218
e316aad5
DG
2219 DBG3("Consumer delete metadata stream %d", stream->wait_fd);
2220
74251bb8 2221 pthread_mutex_lock(&consumer_data.lock);
a6ef8ee6
JG
2222 /*
2223 * Note that this assumes that a stream's channel is never changed and
2224 * that the stream's lock doesn't need to be taken to sample its
2225 * channel.
2226 */
2227 channel = stream->chan;
2228 pthread_mutex_lock(&channel->lock);
3dad2c0f 2229 pthread_mutex_lock(&stream->lock);
a6ef8ee6 2230 if (channel->metadata_cache) {
081424af 2231 /* Only applicable to userspace consumers. */
a6ef8ee6 2232 pthread_mutex_lock(&channel->metadata_cache->lock);
081424af 2233 }
8994307f 2234
6d574024
DG
2235 /* Remove any reference to that stream. */
2236 consumer_stream_delete(stream, ht);
ca22feea 2237
6d574024
DG
2238 /* Close down everything including the relayd if one. */
2239 consumer_stream_close(stream);
2240 /* Destroy tracer buffers of the stream. */
2241 consumer_stream_destroy_buffers(stream);
fb3a43a9
DG
2242
2243 /* Atomically decrement channel refcount since other threads can use it. */
a6ef8ee6
JG
2244 if (!uatomic_sub_return(&channel->refcount, 1)
2245 && !uatomic_read(&channel->nb_init_stream_left)) {
c30aaa51 2246 /* Go for channel deletion! */
a6ef8ee6 2247 free_channel = true;
fb3a43a9 2248 }
a6ef8ee6 2249 stream->chan = NULL;
fb3a43a9 2250
73811ecc
DG
2251 /*
2252 * Nullify the stream reference so it is not used after deletion. The
6d574024
DG
2253 * channel lock MUST be acquired before being able to check for a NULL
2254 * pointer value.
73811ecc 2255 */
a6ef8ee6 2256 channel->metadata_stream = NULL;
73811ecc 2257
a6ef8ee6
JG
2258 if (channel->metadata_cache) {
2259 pthread_mutex_unlock(&channel->metadata_cache->lock);
081424af 2260 }
3dad2c0f 2261 pthread_mutex_unlock(&stream->lock);
a6ef8ee6 2262 pthread_mutex_unlock(&channel->lock);
74251bb8 2263 pthread_mutex_unlock(&consumer_data.lock);
e316aad5 2264
a6ef8ee6
JG
2265 if (free_channel) {
2266 consumer_del_channel(channel);
e316aad5
DG
2267 }
2268
d2956687
JG
2269 lttng_trace_chunk_put(stream->trace_chunk);
2270 stream->trace_chunk = NULL;
6d574024 2271 consumer_stream_free(stream);
fb3a43a9
DG
2272}
2273
2274/*
2275 * Action done with the metadata stream when adding it to the consumer internal
2276 * data structures to handle it.
2277 */
66d583dc 2278void consumer_add_metadata_stream(struct lttng_consumer_stream *stream)
fb3a43a9 2279{
5ab66908 2280 struct lttng_ht *ht = metadata_ht;
76082088 2281 struct lttng_ht_iter iter;
d88aee68 2282 struct lttng_ht_node_u64 *node;
fb3a43a9 2283
e316aad5
DG
2284 assert(stream);
2285 assert(ht);
2286
d88aee68 2287 DBG3("Adding metadata stream %" PRIu64 " to hash table", stream->key);
e316aad5
DG
2288
2289 pthread_mutex_lock(&consumer_data.lock);
a9838785 2290 pthread_mutex_lock(&stream->chan->lock);
ec6ea7d0 2291 pthread_mutex_lock(&stream->chan->timer_lock);
2e818a6a 2292 pthread_mutex_lock(&stream->lock);
e316aad5 2293
e316aad5
DG
2294 /*
2295 * From here, refcounts are updated so be _careful_ when returning an error
2296 * after this point.
2297 */
2298
fb3a43a9 2299 rcu_read_lock();
76082088
DG
2300
2301 /*
2302 * Lookup the stream just to make sure it does not exist in our internal
2303 * state. This should NEVER happen.
2304 */
d88aee68
DG
2305 lttng_ht_lookup(ht, &stream->key, &iter);
2306 node = lttng_ht_iter_get_node_u64(&iter);
76082088
DG
2307 assert(!node);
2308
e316aad5 2309 /*
ffe60014
DG
2310 * When nb_init_stream_left reaches 0, we don't need to trigger any action
2311 * in terms of destroying the associated channel, because the action that
e316aad5
DG
2312 * causes the count to become 0 also causes a stream to be added. The
2313 * channel deletion will thus be triggered by the following removal of this
2314 * stream.
2315 */
ffe60014 2316 if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) {
f2ad556d
MD
2317 /* Increment refcount before decrementing nb_init_stream_left */
2318 cmm_smp_wmb();
ffe60014 2319 uatomic_dec(&stream->chan->nb_init_stream_left);
e316aad5
DG
2320 }
2321
d88aee68 2322 lttng_ht_add_unique_u64(ht, &stream->node);
ca22feea 2323
446156b4 2324 lttng_ht_add_u64(consumer_data.stream_per_chan_id_ht,
d8ef542d
MD
2325 &stream->node_channel_id);
2326
ca22feea
DG
2327 /*
2328 * Add stream to the stream_list_ht of the consumer data. No need to steal
2329 * the key since the HT does not use it and we allow to add redundant keys
2330 * into this table.
2331 */
d88aee68 2332 lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id);
ca22feea 2333
fb3a43a9 2334 rcu_read_unlock();
e316aad5 2335
2e818a6a 2336 pthread_mutex_unlock(&stream->lock);
a9838785 2337 pthread_mutex_unlock(&stream->chan->lock);
ec6ea7d0 2338 pthread_mutex_unlock(&stream->chan->timer_lock);
e316aad5 2339 pthread_mutex_unlock(&consumer_data.lock);
fb3a43a9
DG
2340}
2341
8994307f
DG
2342/*
2343 * Delete data stream that are flagged for deletion (endpoint_status).
2344 */
2345static void validate_endpoint_status_data_stream(void)
2346{
2347 struct lttng_ht_iter iter;
2348 struct lttng_consumer_stream *stream;
2349
2350 DBG("Consumer delete flagged data stream");
2351
2352 rcu_read_lock();
2353 cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) {
2354 /* Validate delete flag of the stream */
79d4ffb7 2355 if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) {
8994307f
DG
2356 continue;
2357 }
2358 /* Delete it right now */
2359 consumer_del_stream(stream, data_ht);
2360 }
2361 rcu_read_unlock();
2362}
2363
2364/*
2365 * Delete metadata stream that are flagged for deletion (endpoint_status).
2366 */
2367static void validate_endpoint_status_metadata_stream(
2368 struct lttng_poll_event *pollset)
2369{
2370 struct lttng_ht_iter iter;
2371 struct lttng_consumer_stream *stream;
2372
2373 DBG("Consumer delete flagged metadata stream");
2374
2375 assert(pollset);
2376
2377 rcu_read_lock();
2378 cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) {
2379 /* Validate delete flag of the stream */
79d4ffb7 2380 if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) {
8994307f
DG
2381 continue;
2382 }
2383 /*
2384 * Remove from pollset so the metadata thread can continue without
2385 * blocking on a deleted stream.
2386 */
2387 lttng_poll_del(pollset, stream->wait_fd);
2388
2389 /* Delete it right now */
2390 consumer_del_metadata_stream(stream, metadata_ht);
2391 }
2392 rcu_read_unlock();
2393}
2394
fb3a43a9
DG
2395/*
2396 * Thread polls on metadata file descriptor and write them on disk or on the
2397 * network.
2398 */
7d980def 2399void *consumer_thread_metadata_poll(void *data)
fb3a43a9 2400{
1fc79fb4 2401 int ret, i, pollfd, err = -1;
fb3a43a9 2402 uint32_t revents, nb_fd;
e316aad5 2403 struct lttng_consumer_stream *stream = NULL;
fb3a43a9 2404 struct lttng_ht_iter iter;
d88aee68 2405 struct lttng_ht_node_u64 *node;
fb3a43a9
DG
2406 struct lttng_poll_event events;
2407 struct lttng_consumer_local_data *ctx = data;
2408 ssize_t len;
2409
2410 rcu_register_thread();
2411
1fc79fb4
MD
2412 health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA);
2413
2d57de81
MD
2414 if (testpoint(consumerd_thread_metadata)) {
2415 goto error_testpoint;
2416 }
2417
9ce5646a
MD
2418 health_code_update();
2419
fb3a43a9
DG
2420 DBG("Thread metadata poll started");
2421
fb3a43a9
DG
2422 /* Size is set to 1 for the consumer_metadata pipe */
2423 ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
2424 if (ret < 0) {
2425 ERR("Poll set creation failed");
d8ef542d 2426 goto end_poll;
fb3a43a9
DG
2427 }
2428
13886d2d
DG
2429 ret = lttng_poll_add(&events,
2430 lttng_pipe_get_readfd(ctx->consumer_metadata_pipe), LPOLLIN);
fb3a43a9
DG
2431 if (ret < 0) {
2432 goto end;
2433 }
2434
2435 /* Main loop */
2436 DBG("Metadata main loop started");
2437
2438 while (1) {
fb3a43a9 2439restart:
7fa2082e 2440 health_code_update();
9ce5646a 2441 health_poll_entry();
7fa2082e 2442 DBG("Metadata poll wait");
fb3a43a9 2443 ret = lttng_poll_wait(&events, -1);
7fa2082e
MD
2444 DBG("Metadata poll return from wait with %d fd(s)",
2445 LTTNG_POLL_GETNB(&events));
9ce5646a 2446 health_poll_exit();
40063ead 2447 DBG("Metadata event caught in thread");
fb3a43a9
DG
2448 if (ret < 0) {
2449 if (errno == EINTR) {
40063ead 2450 ERR("Poll EINTR caught");
fb3a43a9
DG
2451 goto restart;
2452 }
d9607cd7
MD
2453 if (LTTNG_POLL_GETNB(&events) == 0) {
2454 err = 0; /* All is OK */
2455 }
2456 goto end;
fb3a43a9
DG
2457 }
2458
0d9c5d77
DG
2459 nb_fd = ret;
2460
e316aad5 2461 /* From here, the event is a metadata wait fd */
fb3a43a9 2462 for (i = 0; i < nb_fd; i++) {
9ce5646a
MD
2463 health_code_update();
2464
fb3a43a9
DG
2465 revents = LTTNG_POLL_GETEV(&events, i);
2466 pollfd = LTTNG_POLL_GETFD(&events, i);
2467
13886d2d 2468 if (pollfd == lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)) {
03e43155 2469 if (revents & LPOLLIN) {
13886d2d
DG
2470 ssize_t pipe_len;
2471
2472 pipe_len = lttng_pipe_read(ctx->consumer_metadata_pipe,
2473 &stream, sizeof(stream));
6cd525e8 2474 if (pipe_len < sizeof(stream)) {
03e43155
MD
2475 if (pipe_len < 0) {
2476 PERROR("read metadata stream");
2477 }
fb3a43a9 2478 /*
03e43155
MD
2479 * Remove the pipe from the poll set and continue the loop
2480 * since their might be data to consume.
fb3a43a9 2481 */
03e43155
MD
2482 lttng_poll_del(&events,
2483 lttng_pipe_get_readfd(ctx->consumer_metadata_pipe));
2484 lttng_pipe_read_close(ctx->consumer_metadata_pipe);
fb3a43a9
DG
2485 continue;
2486 }
2487
8994307f
DG
2488 /* A NULL stream means that the state has changed. */
2489 if (stream == NULL) {
2490 /* Check for deleted streams. */
2491 validate_endpoint_status_metadata_stream(&events);
3714380f 2492 goto restart;
8994307f
DG
2493 }
2494
fb3a43a9
DG
2495 DBG("Adding metadata stream %d to poll set",
2496 stream->wait_fd);
2497
fb3a43a9
DG
2498 /* Add metadata stream to the global poll events list */
2499 lttng_poll_add(&events, stream->wait_fd,
6d574024 2500 LPOLLIN | LPOLLPRI | LPOLLHUP);
03e43155
MD
2501 } else if (revents & (LPOLLERR | LPOLLHUP)) {
2502 DBG("Metadata thread pipe hung up");
2503 /*
2504 * Remove the pipe from the poll set and continue the loop
2505 * since their might be data to consume.
2506 */
2507 lttng_poll_del(&events,
2508 lttng_pipe_get_readfd(ctx->consumer_metadata_pipe));
2509 lttng_pipe_read_close(ctx->consumer_metadata_pipe);
2510 continue;
2511 } else {
2512 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2513 goto end;
fb3a43a9
DG
2514 }
2515
e316aad5 2516 /* Handle other stream */
fb3a43a9
DG
2517 continue;
2518 }
2519
d09e1200 2520 rcu_read_lock();
d88aee68
DG
2521 {
2522 uint64_t tmp_id = (uint64_t) pollfd;
2523
2524 lttng_ht_lookup(metadata_ht, &tmp_id, &iter);
2525 }
2526 node = lttng_ht_iter_get_node_u64(&iter);
e316aad5 2527 assert(node);
fb3a43a9
DG
2528
2529 stream = caa_container_of(node, struct lttng_consumer_stream,
58b1f425 2530 node);
fb3a43a9 2531
03e43155
MD
2532 if (revents & (LPOLLIN | LPOLLPRI)) {
2533 /* Get the data out of the metadata file descriptor */
2534 DBG("Metadata available on fd %d", pollfd);
2535 assert(stream->wait_fd == pollfd);
2536
2537 do {
2538 health_code_update();
2539
2540 len = ctx->on_buffer_ready(stream, ctx);
2541 /*
2542 * We don't check the return value here since if we get
83f4233d 2543 * a negative len, it means an error occurred thus we
03e43155
MD
2544 * simply remove it from the poll set and free the
2545 * stream.
2546 */
2547 } while (len > 0);
2548
2549 /* It's ok to have an unavailable sub-buffer */
2550 if (len < 0 && len != -EAGAIN && len != -ENODATA) {
2551 /* Clean up stream from consumer and free it. */
2552 lttng_poll_del(&events, stream->wait_fd);
2553 consumer_del_metadata_stream(stream, metadata_ht);
2554 }
2555 } else if (revents & (LPOLLERR | LPOLLHUP)) {
e316aad5 2556 DBG("Metadata fd %d is hup|err.", pollfd);
fb3a43a9
DG
2557 if (!stream->hangup_flush_done
2558 && (consumer_data.type == LTTNG_CONSUMER32_UST
2559 || consumer_data.type == LTTNG_CONSUMER64_UST)) {
2560 DBG("Attempting to flush and consume the UST buffers");
2561 lttng_ustconsumer_on_stream_hangup(stream);
2562
2563 /* We just flushed the stream now read it. */
4bb94b75 2564 do {
9ce5646a
MD
2565 health_code_update();
2566
4bb94b75
DG
2567 len = ctx->on_buffer_ready(stream, ctx);
2568 /*
2569 * We don't check the return value here since if we get
83f4233d 2570 * a negative len, it means an error occurred thus we
4bb94b75
DG
2571 * simply remove it from the poll set and free the
2572 * stream.
2573 */
2574 } while (len > 0);
fb3a43a9
DG
2575 }
2576
fb3a43a9 2577 lttng_poll_del(&events, stream->wait_fd);
e316aad5
DG
2578 /*
2579 * This call update the channel states, closes file descriptors
2580 * and securely free the stream.
2581 */
2582 consumer_del_metadata_stream(stream, metadata_ht);
03e43155
MD
2583 } else {
2584 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
6f2f1a70 2585 rcu_read_unlock();
03e43155 2586 goto end;
fb3a43a9 2587 }
e316aad5 2588 /* Release RCU lock for the stream looked up */
d09e1200 2589 rcu_read_unlock();
fb3a43a9
DG
2590 }
2591 }
2592
1fc79fb4
MD
2593 /* All is OK */
2594 err = 0;
fb3a43a9
DG
2595end:
2596 DBG("Metadata poll thread exiting");
fb3a43a9 2597
d8ef542d
MD
2598 lttng_poll_clean(&events);
2599end_poll:
2d57de81 2600error_testpoint:
1fc79fb4
MD
2601 if (err) {
2602 health_error();
2603 ERR("Health error occurred in %s", __func__);
2604 }
2605 health_unregister(health_consumerd);
fb3a43a9
DG
2606 rcu_unregister_thread();
2607 return NULL;
2608}
2609
3bd1e081 2610/*
e4421fec 2611 * This thread polls the fds in the set to consume the data and write
3bd1e081
MD
2612 * it to tracefile if necessary.
2613 */
7d980def 2614void *consumer_thread_data_poll(void *data)
3bd1e081 2615{
1fc79fb4 2616 int num_rdy, num_hup, high_prio, ret, i, err = -1;
3bd1e081
MD
2617 struct pollfd *pollfd = NULL;
2618 /* local view of the streams */
c869f647 2619 struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL;
3bd1e081 2620 /* local view of consumer_data.fds_count */
8bdcc002
JG
2621 int nb_fd = 0;
2622 /* 2 for the consumer_data_pipe and wake up pipe */
2623 const int nb_pipes_fd = 2;
9a2fcf78
JD
2624 /* Number of FDs with CONSUMER_ENDPOINT_INACTIVE but still open. */
2625 int nb_inactive_fd = 0;
3bd1e081 2626 struct lttng_consumer_local_data *ctx = data;
00e2e675 2627 ssize_t len;
3bd1e081 2628
e7b994a3
DG
2629 rcu_register_thread();
2630
1fc79fb4
MD
2631 health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_DATA);
2632
2d57de81
MD
2633 if (testpoint(consumerd_thread_data)) {
2634 goto error_testpoint;
2635 }
2636
9ce5646a
MD
2637 health_code_update();
2638
4df6c8cb
MD
2639 local_stream = zmalloc(sizeof(struct lttng_consumer_stream *));
2640 if (local_stream == NULL) {
2641 PERROR("local_stream malloc");
2642 goto end;
2643 }
3bd1e081
MD
2644
2645 while (1) {
9ce5646a
MD
2646 health_code_update();
2647
3bd1e081
MD
2648 high_prio = 0;
2649 num_hup = 0;
2650
2651 /*
e4421fec 2652 * the fds set has been updated, we need to update our
3bd1e081
MD
2653 * local array as well
2654 */
2655 pthread_mutex_lock(&consumer_data.lock);
2656 if (consumer_data.need_update) {
0e428499
DG
2657 free(pollfd);
2658 pollfd = NULL;
2659
2660 free(local_stream);
2661 local_stream = NULL;
3bd1e081 2662
8bdcc002 2663 /* Allocate for all fds */
261de637 2664 pollfd = zmalloc((consumer_data.stream_count + nb_pipes_fd) * sizeof(struct pollfd));
3bd1e081 2665 if (pollfd == NULL) {
7a57cf92 2666 PERROR("pollfd malloc");
3bd1e081
MD
2667 pthread_mutex_unlock(&consumer_data.lock);
2668 goto end;
2669 }
2670
261de637 2671 local_stream = zmalloc((consumer_data.stream_count + nb_pipes_fd) *
747f8642 2672 sizeof(struct lttng_consumer_stream *));
3bd1e081 2673 if (local_stream == NULL) {
7a57cf92 2674 PERROR("local_stream malloc");
3bd1e081
MD
2675 pthread_mutex_unlock(&consumer_data.lock);
2676 goto end;
2677 }
ffe60014 2678 ret = update_poll_array(ctx, &pollfd, local_stream,
9a2fcf78 2679 data_ht, &nb_inactive_fd);
3bd1e081
MD
2680 if (ret < 0) {
2681 ERR("Error in allocating pollfd or local_outfds");
f73fabfd 2682 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR);
3bd1e081
MD
2683 pthread_mutex_unlock(&consumer_data.lock);
2684 goto end;
2685 }
2686 nb_fd = ret;
2687 consumer_data.need_update = 0;
2688 }
2689 pthread_mutex_unlock(&consumer_data.lock);
2690
4078b776 2691 /* No FDs and consumer_quit, consumer_cleanup the thread */
9a2fcf78
JD
2692 if (nb_fd == 0 && nb_inactive_fd == 0 &&
2693 CMM_LOAD_SHARED(consumer_quit) == 1) {
1fc79fb4 2694 err = 0; /* All is OK */
4078b776
MD
2695 goto end;
2696 }
3bd1e081 2697 /* poll on the array of fds */
88f2b785 2698 restart:
261de637 2699 DBG("polling on %d fd", nb_fd + nb_pipes_fd);
cf0bcb51
JG
2700 if (testpoint(consumerd_thread_data_poll)) {
2701 goto end;
2702 }
9ce5646a 2703 health_poll_entry();
261de637 2704 num_rdy = poll(pollfd, nb_fd + nb_pipes_fd, -1);
9ce5646a 2705 health_poll_exit();
3bd1e081
MD
2706 DBG("poll num_rdy : %d", num_rdy);
2707 if (num_rdy == -1) {
88f2b785
MD
2708 /*
2709 * Restart interrupted system call.
2710 */
2711 if (errno == EINTR) {
2712 goto restart;
2713 }
7a57cf92 2714 PERROR("Poll error");
f73fabfd 2715 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR);
3bd1e081
MD
2716 goto end;
2717 } else if (num_rdy == 0) {
2718 DBG("Polling thread timed out");
2719 goto end;
2720 }
2721
80957876
JG
2722 if (caa_unlikely(data_consumption_paused)) {
2723 DBG("Data consumption paused, sleeping...");
2724 sleep(1);
2725 goto restart;
2726 }
2727
3bd1e081 2728 /*
50f8ae69 2729 * If the consumer_data_pipe triggered poll go directly to the
00e2e675
DG
2730 * beginning of the loop to update the array. We want to prioritize
2731 * array update over low-priority reads.
3bd1e081 2732 */
509bb1cf 2733 if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) {
ab30f567 2734 ssize_t pipe_readlen;
04fdd819 2735
50f8ae69 2736 DBG("consumer_data_pipe wake up");
acdb9057
DG
2737 pipe_readlen = lttng_pipe_read(ctx->consumer_data_pipe,
2738 &new_stream, sizeof(new_stream));
6cd525e8
MD
2739 if (pipe_readlen < sizeof(new_stream)) {
2740 PERROR("Consumer data pipe");
23f5f35d
DG
2741 /* Continue so we can at least handle the current stream(s). */
2742 continue;
2743 }
c869f647
DG
2744
2745 /*
2746 * If the stream is NULL, just ignore it. It's also possible that
2747 * the sessiond poll thread changed the consumer_quit state and is
2748 * waking us up to test it.
2749 */
2750 if (new_stream == NULL) {
8994307f 2751 validate_endpoint_status_data_stream();
c869f647
DG
2752 continue;
2753 }
2754
c869f647 2755 /* Continue to update the local streams and handle prio ones */
3bd1e081
MD
2756 continue;
2757 }
2758
02b3d176
DG
2759 /* Handle wakeup pipe. */
2760 if (pollfd[nb_fd + 1].revents & (POLLIN | POLLPRI)) {
2761 char dummy;
2762 ssize_t pipe_readlen;
2763
2764 pipe_readlen = lttng_pipe_read(ctx->consumer_wakeup_pipe, &dummy,
2765 sizeof(dummy));
2766 if (pipe_readlen < 0) {
2767 PERROR("Consumer data wakeup pipe");
2768 }
2769 /* We've been awakened to handle stream(s). */
2770 ctx->has_wakeup = 0;
2771 }
2772
3bd1e081
MD
2773 /* Take care of high priority channels first. */
2774 for (i = 0; i < nb_fd; i++) {
9ce5646a
MD
2775 health_code_update();
2776
9617607b
DG
2777 if (local_stream[i] == NULL) {
2778 continue;
2779 }
fb3a43a9 2780 if (pollfd[i].revents & POLLPRI) {
d41f73b7
MD
2781 DBG("Urgent read on fd %d", pollfd[i].fd);
2782 high_prio = 1;
4078b776 2783 len = ctx->on_buffer_ready(local_stream[i], ctx);
d41f73b7 2784 /* it's ok to have an unavailable sub-buffer */
b64403e3 2785 if (len < 0 && len != -EAGAIN && len != -ENODATA) {
ab1027f4
DG
2786 /* Clean the stream and free it. */
2787 consumer_del_stream(local_stream[i], data_ht);
9617607b 2788 local_stream[i] = NULL;
4078b776
MD
2789 } else if (len > 0) {
2790 local_stream[i]->data_read = 1;
d41f73b7 2791 }
3bd1e081
MD
2792 }
2793 }
2794
4078b776
MD
2795 /*
2796 * If we read high prio channel in this loop, try again
2797 * for more high prio data.
2798 */
2799 if (high_prio) {
3bd1e081
MD
2800 continue;
2801 }
2802
2803 /* Take care of low priority channels. */
4078b776 2804 for (i = 0; i < nb_fd; i++) {
9ce5646a
MD
2805 health_code_update();
2806
9617607b
DG
2807 if (local_stream[i] == NULL) {
2808 continue;
2809 }
4078b776 2810 if ((pollfd[i].revents & POLLIN) ||
02b3d176
DG
2811 local_stream[i]->hangup_flush_done ||
2812 local_stream[i]->has_data) {
4078b776
MD
2813 DBG("Normal read on fd %d", pollfd[i].fd);
2814 len = ctx->on_buffer_ready(local_stream[i], ctx);
2815 /* it's ok to have an unavailable sub-buffer */
b64403e3 2816 if (len < 0 && len != -EAGAIN && len != -ENODATA) {
ab1027f4
DG
2817 /* Clean the stream and free it. */
2818 consumer_del_stream(local_stream[i], data_ht);
9617607b 2819 local_stream[i] = NULL;
4078b776
MD
2820 } else if (len > 0) {
2821 local_stream[i]->data_read = 1;
2822 }
2823 }
2824 }
2825
2826 /* Handle hangup and errors */
2827 for (i = 0; i < nb_fd; i++) {
9ce5646a
MD
2828 health_code_update();
2829
9617607b
DG
2830 if (local_stream[i] == NULL) {
2831 continue;
2832 }
4078b776
MD
2833 if (!local_stream[i]->hangup_flush_done
2834 && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL))
2835 && (consumer_data.type == LTTNG_CONSUMER32_UST
2836 || consumer_data.type == LTTNG_CONSUMER64_UST)) {
2837 DBG("fd %d is hup|err|nval. Attempting flush and read.",
9617607b 2838 pollfd[i].fd);
4078b776
MD
2839 lttng_ustconsumer_on_stream_hangup(local_stream[i]);
2840 /* Attempt read again, for the data we just flushed. */
2841 local_stream[i]->data_read = 1;
2842 }
2843 /*
2844 * If the poll flag is HUP/ERR/NVAL and we have
2845 * read no data in this pass, we can remove the
2846 * stream from its hash table.
2847 */
2848 if ((pollfd[i].revents & POLLHUP)) {
2849 DBG("Polling fd %d tells it has hung up.", pollfd[i].fd);
2850 if (!local_stream[i]->data_read) {
43c34bc3 2851 consumer_del_stream(local_stream[i], data_ht);
9617607b 2852 local_stream[i] = NULL;
4078b776
MD
2853 num_hup++;
2854 }
2855 } else if (pollfd[i].revents & POLLERR) {
2856 ERR("Error returned in polling fd %d.", pollfd[i].fd);
2857 if (!local_stream[i]->data_read) {
43c34bc3 2858 consumer_del_stream(local_stream[i], data_ht);
9617607b 2859 local_stream[i] = NULL;
4078b776
MD
2860 num_hup++;
2861 }
2862 } else if (pollfd[i].revents & POLLNVAL) {
2863 ERR("Polling fd %d tells fd is not open.", pollfd[i].fd);
2864 if (!local_stream[i]->data_read) {
43c34bc3 2865 consumer_del_stream(local_stream[i], data_ht);
9617607b 2866 local_stream[i] = NULL;
4078b776 2867 num_hup++;
3bd1e081
MD
2868 }
2869 }
9617607b
DG
2870 if (local_stream[i] != NULL) {
2871 local_stream[i]->data_read = 0;
2872 }
3bd1e081
MD
2873 }
2874 }
1fc79fb4
MD
2875 /* All is OK */
2876 err = 0;
3bd1e081
MD
2877end:
2878 DBG("polling thread exiting");
0e428499
DG
2879 free(pollfd);
2880 free(local_stream);
fb3a43a9
DG
2881
2882 /*
2883 * Close the write side of the pipe so epoll_wait() in
7d980def
DG
2884 * consumer_thread_metadata_poll can catch it. The thread is monitoring the
2885 * read side of the pipe. If we close them both, epoll_wait strangely does
2886 * not return and could create a endless wait period if the pipe is the
2887 * only tracked fd in the poll set. The thread will take care of closing
2888 * the read side.
fb3a43a9 2889 */
13886d2d 2890 (void) lttng_pipe_write_close(ctx->consumer_metadata_pipe);
fb3a43a9 2891
2d57de81 2892error_testpoint:
1fc79fb4
MD
2893 if (err) {
2894 health_error();
2895 ERR("Health error occurred in %s", __func__);
2896 }
2897 health_unregister(health_consumerd);
2898
e7b994a3 2899 rcu_unregister_thread();
3bd1e081
MD
2900 return NULL;
2901}
2902
d8ef542d
MD
2903/*
2904 * Close wake-up end of each stream belonging to the channel. This will
2905 * allow the poll() on the stream read-side to detect when the
2906 * write-side (application) finally closes them.
2907 */
2908static
2909void consumer_close_channel_streams(struct lttng_consumer_channel *channel)
2910{
2911 struct lttng_ht *ht;
2912 struct lttng_consumer_stream *stream;
2913 struct lttng_ht_iter iter;
2914
2915 ht = consumer_data.stream_per_chan_id_ht;
2916
2917 rcu_read_lock();
2918 cds_lfht_for_each_entry_duplicate(ht->ht,
2919 ht->hash_fct(&channel->key, lttng_ht_seed),
2920 ht->match_fct, &channel->key,
2921 &iter.iter, stream, node_channel_id.node) {
f2ad556d
MD
2922 /*
2923 * Protect against teardown with mutex.
2924 */
2925 pthread_mutex_lock(&stream->lock);
2926 if (cds_lfht_is_node_deleted(&stream->node.node)) {
2927 goto next;
2928 }
d8ef542d
MD
2929 switch (consumer_data.type) {
2930 case LTTNG_CONSUMER_KERNEL:
2931 break;
2932 case LTTNG_CONSUMER32_UST:
2933 case LTTNG_CONSUMER64_UST:
b4a650f3
DG
2934 if (stream->metadata_flag) {
2935 /* Safe and protected by the stream lock. */
2936 lttng_ustconsumer_close_metadata(stream->chan);
2937 } else {
2938 /*
2939 * Note: a mutex is taken internally within
2940 * liblttng-ust-ctl to protect timer wakeup_fd
2941 * use from concurrent close.
2942 */
2943 lttng_ustconsumer_close_stream_wakeup(stream);
2944 }
d8ef542d
MD
2945 break;
2946 default:
2947 ERR("Unknown consumer_data type");
2948 assert(0);
2949 }
f2ad556d
MD
2950 next:
2951 pthread_mutex_unlock(&stream->lock);
d8ef542d
MD
2952 }
2953 rcu_read_unlock();
2954}
2955
2956static void destroy_channel_ht(struct lttng_ht *ht)
2957{
2958 struct lttng_ht_iter iter;
2959 struct lttng_consumer_channel *channel;
2960 int ret;
2961
2962 if (ht == NULL) {
2963 return;
2964 }
2965
2966 rcu_read_lock();
2967 cds_lfht_for_each_entry(ht->ht, &iter.iter, channel, wait_fd_node.node) {
2968 ret = lttng_ht_del(ht, &iter);
2969 assert(ret != 0);
2970 }
2971 rcu_read_unlock();
2972
2973 lttng_ht_destroy(ht);
2974}
2975
2976/*
2977 * This thread polls the channel fds to detect when they are being
2978 * closed. It closes all related streams if the channel is detected as
2979 * closed. It is currently only used as a shim layer for UST because the
2980 * consumerd needs to keep the per-stream wakeup end of pipes open for
2981 * periodical flush.
2982 */
2983void *consumer_thread_channel_poll(void *data)
2984{
1fc79fb4 2985 int ret, i, pollfd, err = -1;
d8ef542d
MD
2986 uint32_t revents, nb_fd;
2987 struct lttng_consumer_channel *chan = NULL;
2988 struct lttng_ht_iter iter;
2989 struct lttng_ht_node_u64 *node;
2990 struct lttng_poll_event events;
2991 struct lttng_consumer_local_data *ctx = data;
2992 struct lttng_ht *channel_ht;
2993
2994 rcu_register_thread();
2995
1fc79fb4
MD
2996 health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_CHANNEL);
2997
2d57de81
MD
2998 if (testpoint(consumerd_thread_channel)) {
2999 goto error_testpoint;
3000 }
3001
9ce5646a
MD
3002 health_code_update();
3003
d8ef542d
MD
3004 channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
3005 if (!channel_ht) {
3006 /* ENOMEM at this point. Better to bail out. */
3007 goto end_ht;
3008 }
3009
3010 DBG("Thread channel poll started");
3011
3012 /* Size is set to 1 for the consumer_channel pipe */
3013 ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
3014 if (ret < 0) {
3015 ERR("Poll set creation failed");
3016 goto end_poll;
3017 }
3018
3019 ret = lttng_poll_add(&events, ctx->consumer_channel_pipe[0], LPOLLIN);
3020 if (ret < 0) {
3021 goto end;
3022 }
3023
3024 /* Main loop */
3025 DBG("Channel main loop started");
3026
3027 while (1) {
d8ef542d 3028restart:
7fa2082e
MD
3029 health_code_update();
3030 DBG("Channel poll wait");
9ce5646a 3031 health_poll_entry();
d8ef542d 3032 ret = lttng_poll_wait(&events, -1);
7fa2082e
MD
3033 DBG("Channel poll return from wait with %d fd(s)",
3034 LTTNG_POLL_GETNB(&events));
9ce5646a 3035 health_poll_exit();
40063ead 3036 DBG("Channel event caught in thread");
d8ef542d
MD
3037 if (ret < 0) {
3038 if (errno == EINTR) {
40063ead 3039 ERR("Poll EINTR caught");
d8ef542d
MD
3040 goto restart;
3041 }
d9607cd7
MD
3042 if (LTTNG_POLL_GETNB(&events) == 0) {
3043 err = 0; /* All is OK */
3044 }
d8ef542d
MD
3045 goto end;
3046 }
3047
3048 nb_fd = ret;
3049
3050 /* From here, the event is a channel wait fd */
3051 for (i = 0; i < nb_fd; i++) {
9ce5646a
MD
3052 health_code_update();
3053
d8ef542d
MD
3054 revents = LTTNG_POLL_GETEV(&events, i);
3055 pollfd = LTTNG_POLL_GETFD(&events, i);
3056
d8ef542d 3057 if (pollfd == ctx->consumer_channel_pipe[0]) {
03e43155 3058 if (revents & LPOLLIN) {
d8ef542d 3059 enum consumer_channel_action action;
a0cbdd2e 3060 uint64_t key;
d8ef542d 3061
a0cbdd2e 3062 ret = read_channel_pipe(ctx, &chan, &key, &action);
d8ef542d 3063 if (ret <= 0) {
03e43155
MD
3064 if (ret < 0) {
3065 ERR("Error reading channel pipe");
3066 }
3067 lttng_poll_del(&events, ctx->consumer_channel_pipe[0]);
d8ef542d
MD
3068 continue;
3069 }
3070
3071 switch (action) {
3072 case CONSUMER_CHANNEL_ADD:
3073 DBG("Adding channel %d to poll set",
3074 chan->wait_fd);
3075
3076 lttng_ht_node_init_u64(&chan->wait_fd_node,
3077 chan->wait_fd);
c7260a81 3078 rcu_read_lock();
d8ef542d
MD
3079 lttng_ht_add_unique_u64(channel_ht,
3080 &chan->wait_fd_node);
c7260a81 3081 rcu_read_unlock();
d8ef542d
MD
3082 /* Add channel to the global poll events list */
3083 lttng_poll_add(&events, chan->wait_fd,
03e43155 3084 LPOLLERR | LPOLLHUP);
d8ef542d 3085 break;
a0cbdd2e
MD
3086 case CONSUMER_CHANNEL_DEL:
3087 {
b4a650f3
DG
3088 /*
3089 * This command should never be called if the channel
3090 * has streams monitored by either the data or metadata
3091 * thread. The consumer only notify this thread with a
3092 * channel del. command if it receives a destroy
3093 * channel command from the session daemon that send it
3094 * if a command prior to the GET_CHANNEL failed.
3095 */
3096
c7260a81 3097 rcu_read_lock();
a0cbdd2e
MD
3098 chan = consumer_find_channel(key);
3099 if (!chan) {
c7260a81 3100 rcu_read_unlock();
a0cbdd2e
MD
3101 ERR("UST consumer get channel key %" PRIu64 " not found for del channel", key);
3102 break;
3103 }
3104 lttng_poll_del(&events, chan->wait_fd);
f623cc0b 3105 iter.iter.node = &chan->wait_fd_node.node;
a0cbdd2e
MD
3106 ret = lttng_ht_del(channel_ht, &iter);
3107 assert(ret == 0);
a0cbdd2e 3108
f2a444f1
DG
3109 switch (consumer_data.type) {
3110 case LTTNG_CONSUMER_KERNEL:
3111 break;
3112 case LTTNG_CONSUMER32_UST:
3113 case LTTNG_CONSUMER64_UST:
212d67a2
DG
3114 health_code_update();
3115 /* Destroy streams that might have been left in the stream list. */
3116 clean_channel_stream_list(chan);
f2a444f1
DG
3117 break;
3118 default:
3119 ERR("Unknown consumer_data type");
3120 assert(0);
3121 }
3122
a0cbdd2e
MD
3123 /*
3124 * Release our own refcount. Force channel deletion even if
3125 * streams were not initialized.
3126 */
3127 if (!uatomic_sub_return(&chan->refcount, 1)) {
3128 consumer_del_channel(chan);
3129 }
c7260a81 3130 rcu_read_unlock();
a0cbdd2e
MD
3131 goto restart;
3132 }
d8ef542d
MD
3133 case CONSUMER_CHANNEL_QUIT:
3134 /*
3135 * Remove the pipe from the poll set and continue the loop
3136 * since their might be data to consume.
3137 */
3138 lttng_poll_del(&events, ctx->consumer_channel_pipe[0]);
3139 continue;
3140 default:
3141 ERR("Unknown action");
3142 break;
3143 }
03e43155
MD
3144 } else if (revents & (LPOLLERR | LPOLLHUP)) {
3145 DBG("Channel thread pipe hung up");
3146 /*
3147 * Remove the pipe from the poll set and continue the loop
3148 * since their might be data to consume.
3149 */
3150 lttng_poll_del(&events, ctx->consumer_channel_pipe[0]);
3151 continue;
3152 } else {
3153 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
3154 goto end;
d8ef542d
MD
3155 }
3156
3157 /* Handle other stream */
3158 continue;
3159 }
3160
3161 rcu_read_lock();
3162 {
3163 uint64_t tmp_id = (uint64_t) pollfd;
3164
3165 lttng_ht_lookup(channel_ht, &tmp_id, &iter);
3166 }
3167 node = lttng_ht_iter_get_node_u64(&iter);
3168 assert(node);
3169
3170 chan = caa_container_of(node, struct lttng_consumer_channel,
3171 wait_fd_node);
3172
3173 /* Check for error event */
3174 if (revents & (LPOLLERR | LPOLLHUP)) {
3175 DBG("Channel fd %d is hup|err.", pollfd);
3176
3177 lttng_poll_del(&events, chan->wait_fd);
3178 ret = lttng_ht_del(channel_ht, &iter);
3179 assert(ret == 0);
b4a650f3
DG
3180
3181 /*
3182 * This will close the wait fd for each stream associated to
3183 * this channel AND monitored by the data/metadata thread thus
3184 * will be clean by the right thread.
3185 */
d8ef542d 3186 consumer_close_channel_streams(chan);
f2ad556d
MD
3187
3188 /* Release our own refcount */
3189 if (!uatomic_sub_return(&chan->refcount, 1)
3190 && !uatomic_read(&chan->nb_init_stream_left)) {
3191 consumer_del_channel(chan);
3192 }
03e43155
MD
3193 } else {
3194 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
3195 rcu_read_unlock();
3196 goto end;
d8ef542d
MD
3197 }
3198
3199 /* Release RCU lock for the channel looked up */
3200 rcu_read_unlock();
3201 }
3202 }
3203
1fc79fb4
MD
3204 /* All is OK */
3205 err = 0;
d8ef542d
MD
3206end:
3207 lttng_poll_clean(&events);
3208end_poll:
3209 destroy_channel_ht(channel_ht);
3210end_ht:
2d57de81 3211error_testpoint:
d8ef542d 3212 DBG("Channel poll thread exiting");
1fc79fb4
MD
3213 if (err) {
3214 health_error();
3215 ERR("Health error occurred in %s", __func__);
3216 }
3217 health_unregister(health_consumerd);
d8ef542d
MD
3218 rcu_unregister_thread();
3219 return NULL;
3220}
3221
331744e3
JD
3222static int set_metadata_socket(struct lttng_consumer_local_data *ctx,
3223 struct pollfd *sockpoll, int client_socket)
3224{
3225 int ret;
3226
3227 assert(ctx);
3228 assert(sockpoll);
3229