[lttng-tools.git] / src / bin / lttng-sessiond / kernel-consumer.cpp

/*
 * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 */

#define _LGPL_SOURCE
#include "consumer.hpp"
#include "health-sessiond.hpp"
#include "kernel-consumer.hpp"
#include "lttng-sessiond.hpp"
#include "notification-thread-commands.hpp"
#include "session.hpp"

#include <common/common.hpp>
#include <common/compat/string.hpp>
#include <common/defaults.hpp>

#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>

static char *create_channel_path(struct consumer_output *consumer, size_t *consumer_path_offset)
{
	int ret;
	char tmp_path[PATH_MAX];
	char *pathname = nullptr;

	LTTNG_ASSERT(consumer);

	/* Get the right path name destination */
	if (consumer->type == CONSUMER_DST_LOCAL ||
	    (consumer->type == CONSUMER_DST_NET && consumer->relay_major_version == 2 &&
	     consumer->relay_minor_version >= 11)) {
		pathname = strdup(consumer->domain_subdir);
		if (!pathname) {
			PERROR("Failed to copy domain subdirectory string %s",
			       consumer->domain_subdir);
			goto error;
		}
		*consumer_path_offset = strlen(consumer->domain_subdir);
		DBG3("Kernel local consumer trace path relative to current trace chunk: \"%s\"",
		     pathname);
	} else {
		/* Network output, relayd < 2.11. */
		ret = snprintf(tmp_path,
			       sizeof(tmp_path),
			       "%s%s",
			       consumer->dst.net.base_dir,
			       consumer->domain_subdir);
		if (ret < 0) {
			PERROR("snprintf kernel metadata path");
			goto error;
		} else if (ret >= sizeof(tmp_path)) {
			ERR("Kernel channel path exceeds the maximal allowed length of of %zu bytes (%i bytes required) with path \"%s%s\"",
			    sizeof(tmp_path),
			    ret,
			    consumer->dst.net.base_dir,
			    consumer->domain_subdir);
			goto error;
		}
		pathname = lttng_strndup(tmp_path, sizeof(tmp_path));
		if (!pathname) {
			PERROR("lttng_strndup");
			goto error;
		}
		*consumer_path_offset = 0;
		DBG3("Kernel network consumer subdir path: %s", pathname);
	}

	return pathname;

error:
	free(pathname);
	return nullptr;
}

/*
 * Sending a single channel to the consumer with command ADD_CHANNEL.
 */
static int kernel_consumer_add_channel(struct consumer_socket *sock,
				       struct ltt_kernel_channel *channel,
				       struct ltt_kernel_session *ksession,
				       unsigned int monitor)
{
	int ret;
	char *pathname = nullptr;
	struct lttcomm_consumer_msg lkm;
	struct consumer_output *consumer;
	enum lttng_error_code status;
	struct ltt_session *session = nullptr;
	struct lttng_channel_extended *channel_attr_extended;
	bool is_local_trace;
	size_t consumer_path_offset = 0;

	/* Safety net */
	LTTNG_ASSERT(channel);
	LTTNG_ASSERT(ksession);
	LTTNG_ASSERT(ksession->consumer);

	consumer = ksession->consumer;
	channel_attr_extended =
		(struct lttng_channel_extended *) channel->channel->attr.extended.ptr;

	DBG("Kernel consumer adding channel %s to kernel consumer", channel->channel->name);
	is_local_trace = consumer->net_seq_index == -1ULL;

	pathname = create_channel_path(consumer, &consumer_path_offset);
	if (!pathname) {
		ret = -1;
		goto error;
	}

	if (is_local_trace && ksession->current_trace_chunk) {
		enum lttng_trace_chunk_status chunk_status;
		char *pathname_index;

		ret = asprintf(&pathname_index, "%s/" DEFAULT_INDEX_DIR, pathname);
		if (ret < 0) {
			ERR("Failed to format channel index directory");
			ret = -1;
			goto error;
		}

		/*
		 * Create the index subdirectory which will take care
		 * of implicitly creating the channel's path.
		 */
		chunk_status = lttng_trace_chunk_create_subdirectory(ksession->current_trace_chunk,
								     pathname_index);
		free(pathname_index);
		if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
			ret = -1;
			goto error;
		}
	}

	/* Prep channel message structure */
	consumer_init_add_channel_comm_msg(&lkm,
					   channel->key,
					   ksession->id,
					   &pathname[consumer_path_offset],
					   consumer->net_seq_index,
					   channel->channel->name,
					   channel->stream_count,
					   channel->channel->attr.output,
					   CONSUMER_CHANNEL_TYPE_DATA,
					   channel->channel->attr.tracefile_size,
					   channel->channel->attr.tracefile_count,
					   monitor,
					   channel->channel->attr.live_timer_interval,
					   ksession->is_live_session,
					   channel_attr_extended->monitor_timer_interval,
					   ksession->current_trace_chunk);

	health_code_update();

	ret = consumer_send_channel(sock, &lkm);
	if (ret < 0) {
		goto error;
	}

	health_code_update();
	rcu_read_lock();
	session = session_find_by_id(ksession->id);
	LTTNG_ASSERT(session);
	ASSERT_LOCKED(session->lock);
	ASSERT_SESSION_LIST_LOCKED();

	status = notification_thread_command_add_channel(the_notification_thread_handle,
							 session->id,
							 channel->channel->name,
							 channel->key,
							 LTTNG_DOMAIN_KERNEL,
							 channel->channel->attr.subbuf_size *
								 channel->channel->attr.num_subbuf);
	rcu_read_unlock();
	if (status != LTTNG_OK) {
		ret = -1;
		goto error;
	}

	channel->published_to_notification_thread = true;

error:
	if (session) {
		session_put(session);
	}
	free(pathname);
	return ret;
}

/*
 * Sending metadata to the consumer with command ADD_CHANNEL and ADD_STREAM.
 *
 * The consumer socket lock must be held by the caller.
 */
int kernel_consumer_add_metadata(struct consumer_socket *sock,
				 struct ltt_kernel_session *ksession,
				 unsigned int monitor)
{
	int ret;
	struct lttcomm_consumer_msg lkm;
	struct consumer_output *consumer;

	rcu_read_lock();

	/* Safety net */
	LTTNG_ASSERT(ksession);
	LTTNG_ASSERT(ksession->consumer);
	LTTNG_ASSERT(sock);

	DBG("Sending metadata %d to kernel consumer", ksession->metadata_stream_fd);

	/* Get consumer output pointer */
	consumer = ksession->consumer;

	/* Prep channel message structure */
	consumer_init_add_channel_comm_msg(&lkm,
					   ksession->metadata->key,
					   ksession->id,
					   "",
					   consumer->net_seq_index,
					   ksession->metadata->conf->name,
					   1,
					   ksession->metadata->conf->attr.output,
					   CONSUMER_CHANNEL_TYPE_METADATA,
					   ksession->metadata->conf->attr.tracefile_size,
					   ksession->metadata->conf->attr.tracefile_count,
					   monitor,
					   ksession->metadata->conf->attr.live_timer_interval,
					   ksession->is_live_session,
					   0,
					   ksession->current_trace_chunk);

	health_code_update();

	ret = consumer_send_channel(sock, &lkm);
	if (ret < 0) {
		goto error;
	}

	health_code_update();

	/* Prep stream message structure */
	consumer_init_add_stream_comm_msg(&lkm,
					  ksession->metadata->key,
					  ksession->metadata_stream_fd,
					  0 /* CPU: 0 for metadata. */);

	health_code_update();

	/* Send stream and file descriptor */
	ret = consumer_send_stream(sock, consumer, &lkm, &ksession->metadata_stream_fd, 1);
	if (ret < 0) {
		goto error;
	}

	health_code_update();

error:
	rcu_read_unlock();
	return ret;
}

/*
 * Sending a single stream to the consumer with command ADD_STREAM.
 */
static int kernel_consumer_add_stream(struct consumer_socket *sock,
				      struct ltt_kernel_channel *channel,
				      struct ltt_kernel_stream *stream,
				      struct ltt_kernel_session *session)
{
	int ret;
	struct lttcomm_consumer_msg lkm;
	struct consumer_output *consumer;

	LTTNG_ASSERT(channel);
	LTTNG_ASSERT(stream);
	LTTNG_ASSERT(session);
	LTTNG_ASSERT(session->consumer);
	LTTNG_ASSERT(sock);

	DBG("Sending stream %d of channel %s to kernel consumer",
	    stream->fd,
	    channel->channel->name);

	/* Get consumer output pointer */
	consumer = session->consumer;

	/* Prep stream consumer message */
	consumer_init_add_stream_comm_msg(&lkm, channel->key, stream->fd, stream->cpu);

	health_code_update();

	/* Send stream and file descriptor */
	ret = consumer_send_stream(sock, consumer, &lkm, &stream->fd, 1);
	if (ret < 0) {
		goto error;
	}

	health_code_update();

error:
	return ret;
}

/*
 * Sending the notification that all streams were sent with STREAMS_SENT.
 */
int kernel_consumer_streams_sent(struct consumer_socket *sock,
				 struct ltt_kernel_session *session,
				 uint64_t channel_key)
{
	int ret;
	struct lttcomm_consumer_msg lkm;
	struct consumer_output *consumer;

	LTTNG_ASSERT(sock);
	LTTNG_ASSERT(session);

	DBG("Sending streams_sent");
	/* Get consumer output pointer */
	consumer = session->consumer;

	/* Prep stream consumer message */
	consumer_init_streams_sent_comm_msg(
		&lkm, LTTNG_CONSUMER_STREAMS_SENT, channel_key, consumer->net_seq_index);

	health_code_update();

	/* Send stream and file descriptor */
	ret = consumer_send_msg(sock, &lkm);
	if (ret < 0) {
		goto error;
	}

error:
	return ret;
}

/*
 * Send all stream fds of kernel channel to the consumer.
 *
 * The consumer socket lock must be held by the caller.
 */
int kernel_consumer_send_channel_streams(struct consumer_socket *sock,
					 struct ltt_kernel_channel *channel,
					 struct ltt_kernel_session *ksession,
					 unsigned int monitor)
{
	int ret = LTTNG_OK;
	struct ltt_kernel_stream *stream;

	/* Safety net */
	LTTNG_ASSERT(channel);
	LTTNG_ASSERT(ksession);
	LTTNG_ASSERT(ksession->consumer);
	LTTNG_ASSERT(sock);

	rcu_read_lock();

	/* Bail out if consumer is disabled */
	if (!ksession->consumer->enabled) {
		ret = LTTNG_OK;
		goto error;
	}

	DBG("Sending streams of channel %s to kernel consumer", channel->channel->name);

	if (!channel->sent_to_consumer) {
		ret = kernel_consumer_add_channel(sock, channel, ksession, monitor);
		if (ret < 0) {
			goto error;
		}
		channel->sent_to_consumer = true;
	}

	/* Send streams */
	cds_list_for_each_entry (stream, &channel->stream_list.head, list) {
		if (!stream->fd || stream->sent_to_consumer) {
			continue;
		}

		/* Add stream on the kernel consumer side. */
		ret = kernel_consumer_add_stream(sock, channel, stream, ksession);
		if (ret < 0) {
			goto error;
		}
		stream->sent_to_consumer = true;
	}

error:
	rcu_read_unlock();
	return ret;
}

/*
 * Send all stream fds of the kernel session to the consumer.
 *
 * The consumer socket lock must be held by the caller.
 */
int kernel_consumer_send_session(struct consumer_socket *sock, struct ltt_kernel_session *session)
{
	int ret, monitor = 0;
	struct ltt_kernel_channel *chan;

	/* Safety net */
	LTTNG_ASSERT(session);
	LTTNG_ASSERT(session->consumer);
	LTTNG_ASSERT(sock);

	/* Bail out if consumer is disabled */
	if (!session->consumer->enabled) {
		ret = LTTNG_OK;
		goto error;
	}

	/* Don't monitor the streams on the consumer if in flight recorder. */
	if (session->output_traces) {
		monitor = 1;
	}

	DBG("Sending session stream to kernel consumer");

	if (session->metadata_stream_fd >= 0 && session->metadata) {
		ret = kernel_consumer_add_metadata(sock, session, monitor);
		if (ret < 0) {
			goto error;
		}
	}

	/* Send channel and streams of it */
	cds_list_for_each_entry (chan, &session->channel_list.head, list) {
		ret = kernel_consumer_send_channel_streams(sock, chan, session, monitor);
		if (ret < 0) {
			goto error;
		}
		if (monitor) {
			/*
			 * Inform the relay that all the streams for the
			 * channel were sent.
			 */
			ret = kernel_consumer_streams_sent(sock, session, chan->key);
			if (ret < 0) {
				goto error;
			}
		}
	}

	DBG("Kernel consumer FDs of metadata and channel streams sent");

	session->consumer_fds_sent = 1;
	return 0;

error:
	return ret;
}

int kernel_consumer_destroy_channel(struct consumer_socket *socket,
				    struct ltt_kernel_channel *channel)
{
	int ret;
	struct lttcomm_consumer_msg msg;

	LTTNG_ASSERT(channel);
	LTTNG_ASSERT(socket);

	DBG("Sending kernel consumer destroy channel key %" PRIu64, channel->key);

	memset(&msg, 0, sizeof(msg));
	msg.cmd_type = LTTNG_CONSUMER_DESTROY_CHANNEL;
	msg.u.destroy_channel.key = channel->key;

	pthread_mutex_lock(socket->lock);
	health_code_update();

	ret = consumer_send_msg(socket, &msg);
	if (ret < 0) {
		goto error;
	}

error:
	health_code_update();
	pthread_mutex_unlock(socket->lock);
	return ret;
}

int kernel_consumer_destroy_metadata(struct consumer_socket *socket,
				     struct ltt_kernel_metadata *metadata)
{
	int ret;
	struct lttcomm_consumer_msg msg;

	LTTNG_ASSERT(metadata);
	LTTNG_ASSERT(socket);

	DBG("Sending kernel consumer destroy channel key %" PRIu64, metadata->key);

	memset(&msg, 0, sizeof(msg));
	msg.cmd_type = LTTNG_CONSUMER_DESTROY_CHANNEL;
	msg.u.destroy_channel.key = metadata->key;

	pthread_mutex_lock(socket->lock);
	health_code_update();

	ret = consumer_send_msg(socket, &msg);
	if (ret < 0) {
		goto error;
	}

error:
	health_code_update();
	pthread_mutex_unlock(socket->lock);
	return ret;
}
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
	3	*
	4	* SPDX-License-Identifier: GPL-2.0-only
	5	*
	6	*/
	7
	8	#define _LGPL_SOURCE
	9	#include "consumer.hpp"
	10	#include "health-sessiond.hpp"
	11	#include "kernel-consumer.hpp"
	12	#include "lttng-sessiond.hpp"
	13	#include "notification-thread-commands.hpp"
	14	#include "session.hpp"
	15
	16	#include <common/common.hpp>
	17	#include <common/compat/string.hpp>
	18	#include <common/defaults.hpp>
	19
	20	#include <inttypes.h>
	21	#include <stdio.h>
	22	#include <stdlib.h>
	23	#include <sys/stat.h>
	24	#include <unistd.h>
	25
	26	static char create_channel_path(struct consumer_output consumer, size_t *consumer_path_offset)
	27	{
	28	int ret;
	29	char tmp_path[PATH_MAX];
	30	char *pathname = nullptr;
	31
	32	LTTNG_ASSERT(consumer);
	33
	34	/* Get the right path name destination */
	35	if (consumer->type == CONSUMER_DST_LOCAL \|\|
	36	(consumer->type == CONSUMER_DST_NET && consumer->relay_major_version == 2 &&
	37	consumer->relay_minor_version >= 11)) {
	38	pathname = strdup(consumer->domain_subdir);
	39	if (!pathname) {
	40	PERROR("Failed to copy domain subdirectory string %s",
	41	consumer->domain_subdir);
	42	goto error;
	43	}
	44	*consumer_path_offset = strlen(consumer->domain_subdir);
	45	DBG3("Kernel local consumer trace path relative to current trace chunk: \"%s\"",
	46	pathname);
	47	} else {
	48	/* Network output, relayd < 2.11. */
	49	ret = snprintf(tmp_path,
	50	sizeof(tmp_path),
	51	"%s%s",
	52	consumer->dst.net.base_dir,
	53	consumer->domain_subdir);
	54	if (ret < 0) {
	55	PERROR("snprintf kernel metadata path");
	56	goto error;
	57	} else if (ret >= sizeof(tmp_path)) {
	58	ERR("Kernel channel path exceeds the maximal allowed length of of %zu bytes (%i bytes required) with path \"%s%s\"",
	59	sizeof(tmp_path),
	60	ret,
	61	consumer->dst.net.base_dir,
	62	consumer->domain_subdir);
	63	goto error;
	64	}
	65	pathname = lttng_strndup(tmp_path, sizeof(tmp_path));
	66	if (!pathname) {
	67	PERROR("lttng_strndup");
	68	goto error;
	69	}
	70	*consumer_path_offset = 0;
	71	DBG3("Kernel network consumer subdir path: %s", pathname);
	72	}
	73
	74	return pathname;
	75
	76	error:
	77	free(pathname);
	78	return nullptr;
	79	}
	80
	81	/*
	82	* Sending a single channel to the consumer with command ADD_CHANNEL.
	83	*/
	84	static int kernel_consumer_add_channel(struct consumer_socket *sock,
	85	struct ltt_kernel_channel *channel,
	86	struct ltt_kernel_session *ksession,
	87	unsigned int monitor)
	88	{
	89	int ret;
	90	char *pathname = nullptr;
	91	struct lttcomm_consumer_msg lkm;
	92	struct consumer_output *consumer;
	93	enum lttng_error_code status;
	94	struct ltt_session *session = nullptr;
	95	struct lttng_channel_extended *channel_attr_extended;
	96	bool is_local_trace;
	97	size_t consumer_path_offset = 0;
	98
	99	/* Safety net */
	100	LTTNG_ASSERT(channel);
	101	LTTNG_ASSERT(ksession);
	102	LTTNG_ASSERT(ksession->consumer);
	103
	104	consumer = ksession->consumer;
	105	channel_attr_extended =
	106	(struct lttng_channel_extended *) channel->channel->attr.extended.ptr;
	107
	108	DBG("Kernel consumer adding channel %s to kernel consumer", channel->channel->name);
	109	is_local_trace = consumer->net_seq_index == -1ULL;
	110
	111	pathname = create_channel_path(consumer, &consumer_path_offset);
	112	if (!pathname) {
	113	ret = -1;
	114	goto error;
	115	}
	116
	117	if (is_local_trace && ksession->current_trace_chunk) {
	118	enum lttng_trace_chunk_status chunk_status;
	119	char *pathname_index;
	120
	121	ret = asprintf(&pathname_index, "%s/" DEFAULT_INDEX_DIR, pathname);
	122	if (ret < 0) {
	123	ERR("Failed to format channel index directory");
	124	ret = -1;
	125	goto error;
	126	}
	127
	128	/*
	129	* Create the index subdirectory which will take care
	130	* of implicitly creating the channel's path.
	131	*/
	132	chunk_status = lttng_trace_chunk_create_subdirectory(ksession->current_trace_chunk,
	133	pathname_index);
	134	free(pathname_index);
	135	if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
	136	ret = -1;
	137	goto error;
	138	}
	139	}
	140
	141	/* Prep channel message structure */
	142	consumer_init_add_channel_comm_msg(&lkm,
	143	channel->key,
	144	ksession->id,
	145	&pathname[consumer_path_offset],
	146	consumer->net_seq_index,
	147	channel->channel->name,
	148	channel->stream_count,
	149	channel->channel->attr.output,
	150	CONSUMER_CHANNEL_TYPE_DATA,
	151	channel->channel->attr.tracefile_size,
	152	channel->channel->attr.tracefile_count,
	153	monitor,
	154	channel->channel->attr.live_timer_interval,
	155	ksession->is_live_session,
	156	channel_attr_extended->monitor_timer_interval,
	157	ksession->current_trace_chunk);
	158
	159	health_code_update();
	160
	161	ret = consumer_send_channel(sock, &lkm);
	162	if (ret < 0) {
	163	goto error;
	164	}
	165
	166	health_code_update();
	167	rcu_read_lock();
	168	session = session_find_by_id(ksession->id);
	169	LTTNG_ASSERT(session);
	170	ASSERT_LOCKED(session->lock);
	171	ASSERT_SESSION_LIST_LOCKED();
	172
	173	status = notification_thread_command_add_channel(the_notification_thread_handle,
	174	session->id,
	175	channel->channel->name,
	176	channel->key,
	177	LTTNG_DOMAIN_KERNEL,
	178	channel->channel->attr.subbuf_size *
	179	channel->channel->attr.num_subbuf);
	180	rcu_read_unlock();
	181	if (status != LTTNG_OK) {
	182	ret = -1;
	183	goto error;
	184	}
	185
	186	channel->published_to_notification_thread = true;
	187
	188	error:
	189	if (session) {
	190	session_put(session);
	191	}
	192	free(pathname);
	193	return ret;
	194	}
	195
	196	/*
	197	* Sending metadata to the consumer with command ADD_CHANNEL and ADD_STREAM.
	198	*
	199	* The consumer socket lock must be held by the caller.
	200	*/
	201	int kernel_consumer_add_metadata(struct consumer_socket *sock,
	202	struct ltt_kernel_session *ksession,
	203	unsigned int monitor)
	204	{
	205	int ret;
	206	struct lttcomm_consumer_msg lkm;
	207	struct consumer_output *consumer;
	208
	209	rcu_read_lock();
	210
	211	/* Safety net */
	212	LTTNG_ASSERT(ksession);
	213	LTTNG_ASSERT(ksession->consumer);
	214	LTTNG_ASSERT(sock);
	215
	216	DBG("Sending metadata %d to kernel consumer", ksession->metadata_stream_fd);
	217
	218	/* Get consumer output pointer */
	219	consumer = ksession->consumer;
	220
	221	/* Prep channel message structure */
	222	consumer_init_add_channel_comm_msg(&lkm,
	223	ksession->metadata->key,
	224	ksession->id,
	225	"",
	226	consumer->net_seq_index,
	227	ksession->metadata->conf->name,
	228	1,
	229	ksession->metadata->conf->attr.output,
	230	CONSUMER_CHANNEL_TYPE_METADATA,
	231	ksession->metadata->conf->attr.tracefile_size,
	232	ksession->metadata->conf->attr.tracefile_count,
	233	monitor,
	234	ksession->metadata->conf->attr.live_timer_interval,
	235	ksession->is_live_session,
	236	0,
	237	ksession->current_trace_chunk);
	238
	239	health_code_update();
	240
	241	ret = consumer_send_channel(sock, &lkm);
	242	if (ret < 0) {
	243	goto error;
	244	}
	245
	246	health_code_update();
	247
	248	/* Prep stream message structure */
	249	consumer_init_add_stream_comm_msg(&lkm,
	250	ksession->metadata->key,
	251	ksession->metadata_stream_fd,
	252	0 /* CPU: 0 for metadata. */);
	253
	254	health_code_update();
	255
	256	/* Send stream and file descriptor */
	257	ret = consumer_send_stream(sock, consumer, &lkm, &ksession->metadata_stream_fd, 1);
	258	if (ret < 0) {
	259	goto error;
	260	}
	261
	262	health_code_update();
	263
	264	error:
	265	rcu_read_unlock();
	266	return ret;
	267	}
	268
	269	/*
	270	* Sending a single stream to the consumer with command ADD_STREAM.
	271	*/
	272	static int kernel_consumer_add_stream(struct consumer_socket *sock,
	273	struct ltt_kernel_channel *channel,
	274	struct ltt_kernel_stream *stream,
	275	struct ltt_kernel_session *session)
	276	{
	277	int ret;
	278	struct lttcomm_consumer_msg lkm;
	279	struct consumer_output *consumer;
	280
	281	LTTNG_ASSERT(channel);
	282	LTTNG_ASSERT(stream);
	283	LTTNG_ASSERT(session);
	284	LTTNG_ASSERT(session->consumer);
	285	LTTNG_ASSERT(sock);
	286
	287	DBG("Sending stream %d of channel %s to kernel consumer",
	288	stream->fd,
	289	channel->channel->name);
	290
	291	/* Get consumer output pointer */
	292	consumer = session->consumer;
	293
	294	/* Prep stream consumer message */
	295	consumer_init_add_stream_comm_msg(&lkm, channel->key, stream->fd, stream->cpu);
	296
	297	health_code_update();
	298
	299	/* Send stream and file descriptor */
	300	ret = consumer_send_stream(sock, consumer, &lkm, &stream->fd, 1);
	301	if (ret < 0) {
	302	goto error;
	303	}
	304
	305	health_code_update();
	306
	307	error:
	308	return ret;
	309	}
	310
	311	/*
	312	* Sending the notification that all streams were sent with STREAMS_SENT.
	313	*/
	314	int kernel_consumer_streams_sent(struct consumer_socket *sock,
	315	struct ltt_kernel_session *session,
	316	uint64_t channel_key)
	317	{
	318	int ret;
	319	struct lttcomm_consumer_msg lkm;
	320	struct consumer_output *consumer;
	321
	322	LTTNG_ASSERT(sock);
	323	LTTNG_ASSERT(session);
	324
	325	DBG("Sending streams_sent");
	326	/* Get consumer output pointer */
	327	consumer = session->consumer;
	328
	329	/* Prep stream consumer message */
	330	consumer_init_streams_sent_comm_msg(
	331	&lkm, LTTNG_CONSUMER_STREAMS_SENT, channel_key, consumer->net_seq_index);
	332
	333	health_code_update();
	334
	335	/* Send stream and file descriptor */
	336	ret = consumer_send_msg(sock, &lkm);
	337	if (ret < 0) {
	338	goto error;
	339	}
	340
	341	error:
	342	return ret;
	343	}
	344
	345	/*
	346	* Send all stream fds of kernel channel to the consumer.
	347	*
	348	* The consumer socket lock must be held by the caller.
	349	*/
	350	int kernel_consumer_send_channel_streams(struct consumer_socket *sock,
	351	struct ltt_kernel_channel *channel,
	352	struct ltt_kernel_session *ksession,
	353	unsigned int monitor)
	354	{
	355	int ret = LTTNG_OK;
	356	struct ltt_kernel_stream *stream;
	357
	358	/* Safety net */
	359	LTTNG_ASSERT(channel);
	360	LTTNG_ASSERT(ksession);
	361	LTTNG_ASSERT(ksession->consumer);
	362	LTTNG_ASSERT(sock);
	363
	364	rcu_read_lock();
	365
	366	/* Bail out if consumer is disabled */
	367	if (!ksession->consumer->enabled) {
	368	ret = LTTNG_OK;
	369	goto error;
	370	}
	371
	372	DBG("Sending streams of channel %s to kernel consumer", channel->channel->name);
	373
	374	if (!channel->sent_to_consumer) {
	375	ret = kernel_consumer_add_channel(sock, channel, ksession, monitor);
	376	if (ret < 0) {
	377	goto error;
	378	}
	379	channel->sent_to_consumer = true;
	380	}
	381
	382	/* Send streams */
	383	cds_list_for_each_entry (stream, &channel->stream_list.head, list) {
	384	if (!stream->fd \|\| stream->sent_to_consumer) {
	385	continue;
	386	}
	387
	388	/* Add stream on the kernel consumer side. */
	389	ret = kernel_consumer_add_stream(sock, channel, stream, ksession);
	390	if (ret < 0) {
	391	goto error;
	392	}
	393	stream->sent_to_consumer = true;
	394	}
	395
	396	error:
	397	rcu_read_unlock();
	398	return ret;
	399	}
	400
	401	/*
	402	* Send all stream fds of the kernel session to the consumer.
	403	*
	404	* The consumer socket lock must be held by the caller.
	405	*/
	406	int kernel_consumer_send_session(struct consumer_socket sock, struct ltt_kernel_session session)
	407	{
	408	int ret, monitor = 0;
	409	struct ltt_kernel_channel *chan;
	410
	411	/* Safety net */
	412	LTTNG_ASSERT(session);
	413	LTTNG_ASSERT(session->consumer);
	414	LTTNG_ASSERT(sock);
	415
	416	/* Bail out if consumer is disabled */
	417	if (!session->consumer->enabled) {
	418	ret = LTTNG_OK;
	419	goto error;
	420	}
	421
	422	/* Don't monitor the streams on the consumer if in flight recorder. */
	423	if (session->output_traces) {
	424	monitor = 1;
	425	}
	426
	427	DBG("Sending session stream to kernel consumer");
	428
	429	if (session->metadata_stream_fd >= 0 && session->metadata) {
	430	ret = kernel_consumer_add_metadata(sock, session, monitor);
	431	if (ret < 0) {
	432	goto error;
	433	}
	434	}
	435
	436	/* Send channel and streams of it */
	437	cds_list_for_each_entry (chan, &session->channel_list.head, list) {
	438	ret = kernel_consumer_send_channel_streams(sock, chan, session, monitor);
	439	if (ret < 0) {
	440	goto error;
	441	}
	442	if (monitor) {
	443	/*
	444	* Inform the relay that all the streams for the
	445	* channel were sent.
	446	*/
	447	ret = kernel_consumer_streams_sent(sock, session, chan->key);
	448	if (ret < 0) {
	449	goto error;
	450	}
	451	}
	452	}
	453
	454	DBG("Kernel consumer FDs of metadata and channel streams sent");
	455
	456	session->consumer_fds_sent = 1;
	457	return 0;
	458
	459	error:
	460	return ret;
	461	}
	462
	463	int kernel_consumer_destroy_channel(struct consumer_socket *socket,
	464	struct ltt_kernel_channel *channel)
	465	{
	466	int ret;
	467	struct lttcomm_consumer_msg msg;
	468
	469	LTTNG_ASSERT(channel);
	470	LTTNG_ASSERT(socket);
	471
	472	DBG("Sending kernel consumer destroy channel key %" PRIu64, channel->key);
	473
	474	memset(&msg, 0, sizeof(msg));
	475	msg.cmd_type = LTTNG_CONSUMER_DESTROY_CHANNEL;
	476	msg.u.destroy_channel.key = channel->key;
	477
	478	pthread_mutex_lock(socket->lock);
	479	health_code_update();
	480
	481	ret = consumer_send_msg(socket, &msg);
	482	if (ret < 0) {
	483	goto error;
	484	}
	485
	486	error:
	487	health_code_update();
	488	pthread_mutex_unlock(socket->lock);
	489	return ret;
	490	}
	491
	492	int kernel_consumer_destroy_metadata(struct consumer_socket *socket,
	493	struct ltt_kernel_metadata *metadata)
	494	{
	495	int ret;
	496	struct lttcomm_consumer_msg msg;
	497
	498	LTTNG_ASSERT(metadata);
	499	LTTNG_ASSERT(socket);
	500
	501	DBG("Sending kernel consumer destroy channel key %" PRIu64, metadata->key);
	502
	503	memset(&msg, 0, sizeof(msg));
	504	msg.cmd_type = LTTNG_CONSUMER_DESTROY_CHANNEL;
	505	msg.u.destroy_channel.key = metadata->key;
	506
	507	pthread_mutex_lock(socket->lock);
	508	health_code_update();
	509
	510	ret = consumer_send_msg(socket, &msg);
	511	if (ret < 0) {
	512	goto error;
	513	}
	514
	515	error:
	516	health_code_update();
	517	pthread_mutex_unlock(socket->lock);
	518	return ret;
	519	}