[lttng-tools.git] / src / bin / lttng-relayd / viewer-stream.c

/*
 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
 *                      David Goulet <dgoulet@efficios.com>
 *               2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License, version 2 only, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#define _GNU_SOURCE
#define _LGPL_SOURCE
#include <common/common.h>
#include <common/index/index.h>
#include <common/compat/string.h>

#include "lttng-relayd.h"
#include "viewer-stream.h"

static void viewer_stream_destroy(struct relay_viewer_stream *vstream)
{
	free(vstream->path_name);
	free(vstream->channel_name);
	free(vstream);
}

static void viewer_stream_destroy_rcu(struct rcu_head *head)
{
	struct relay_viewer_stream *vstream =
		caa_container_of(head, struct relay_viewer_stream, rcu_node);

	viewer_stream_destroy(vstream);
}

struct relay_viewer_stream *viewer_stream_create(struct relay_stream *stream,
		enum lttng_viewer_seek seek_t)
{
	struct relay_viewer_stream *vstream;

	vstream = zmalloc(sizeof(*vstream));
	if (!vstream) {
		PERROR("relay viewer stream zmalloc");
		goto error;
	}

	vstream->path_name = lttng_strndup(stream->path_name, LTTNG_VIEWER_PATH_MAX);
	if (vstream->path_name == NULL) {
		PERROR("relay viewer path_name alloc");
		goto error;
	}
	vstream->channel_name = lttng_strndup(stream->channel_name,
			LTTNG_VIEWER_NAME_MAX);
	if (vstream->channel_name == NULL) {
		PERROR("relay viewer channel_name alloc");
		goto error;
	}

	if (!stream_get(stream)) {
		ERR("Cannot get stream");
		goto error;
	}
	vstream->stream = stream;

	pthread_mutex_lock(&stream->lock);

	if (stream->is_metadata && stream->trace->viewer_metadata_stream) {
		ERR("Cannot attach viewer metadata stream to trace (busy).");
		goto error_unlock;
	}

	switch (seek_t) {
	case LTTNG_VIEWER_SEEK_BEGINNING:
	{
		uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa);

		if (seq_tail == -1ULL) {
			/*
			 * Tail may not be initialized yet. Nonetheless, we know
			 * we want to send the first index once it becomes
			 * available.
			 */
			seq_tail = 0;
		}
		vstream->current_tracefile_id =
			tracefile_array_get_file_index_tail(stream->tfa);
		vstream->index_sent_seqcount = seq_tail;
		break;
	}
	case LTTNG_VIEWER_SEEK_LAST:
		vstream->current_tracefile_id =
			tracefile_array_get_file_index_head(stream->tfa);
		/*
		 * We seek at the very end of each stream, awaiting for
		 * a future packet to eventually come in.
		 *
		 * We don't need to check the head position for -1ULL since the
		 * increment will set it to 0.
		 */
		vstream->index_sent_seqcount =
				tracefile_array_get_seq_head(stream->tfa) + 1;
		break;
	default:
		goto error_unlock;
	}

	/*
	 * If we never received an index for the current stream, delay
	 * the opening of the index, otherwise open it right now.
	 */
	if (stream->index_received_seqcount == 0) {
		vstream->index_fd = NULL;
	} else {
		int read_fd;

		read_fd = index_open(vstream->path_name, vstream->channel_name,
				stream->tracefile_count,
				vstream->current_tracefile_id);
		if (read_fd < 0) {
			goto error_unlock;
		}
		vstream->index_fd = stream_fd_create(read_fd);
		if (!vstream->index_fd) {
			if (close(read_fd)) {
				PERROR("close");
			}
			goto error_unlock;
		}
	}

	if (seek_t == LTTNG_VIEWER_SEEK_LAST && vstream->index_fd) {
		off_t lseek_ret;

		lseek_ret = lseek(vstream->index_fd->fd, 0, SEEK_END);
		if (lseek_ret < 0) {
			goto error_unlock;
		}
	}
	if (stream->is_metadata) {
		rcu_assign_pointer(stream->trace->viewer_metadata_stream,
				vstream);
	}
	pthread_mutex_unlock(&stream->lock);

	/* Globally visible after the add unique. */
	lttng_ht_node_init_u64(&vstream->stream_n, stream->stream_handle);
	lttng_ht_add_unique_u64(viewer_streams_ht, &vstream->stream_n);

	pthread_mutex_init(&vstream->reflock, NULL);
	urcu_ref_init(&vstream->ref);

	return vstream;

error_unlock:
	pthread_mutex_unlock(&stream->lock);
error:
	if (vstream) {
		viewer_stream_destroy(vstream);
	}
	return NULL;
}

static void viewer_stream_unpublish(struct relay_viewer_stream *vstream)
{
	int ret;
	struct lttng_ht_iter iter;

	iter.iter.node = &vstream->stream_n.node;
	ret = lttng_ht_del(viewer_streams_ht, &iter);
	assert(!ret);
}

static void viewer_stream_release(struct urcu_ref *ref)
{
	struct relay_viewer_stream *vstream = caa_container_of(ref,
			struct relay_viewer_stream, ref);

	if (vstream->stream->is_metadata) {
		rcu_assign_pointer(vstream->stream->trace->viewer_metadata_stream, NULL);
	}

	viewer_stream_unpublish(vstream);

	if (vstream->stream_fd) {
		stream_fd_put(vstream->stream_fd);
		vstream->stream_fd = NULL;
	}
	if (vstream->index_fd) {
		stream_fd_put(vstream->index_fd);
		vstream->index_fd = NULL;
	}
	if (vstream->stream) {
		stream_put(vstream->stream);
		vstream->stream = NULL;
	}
	call_rcu(&vstream->rcu_node, viewer_stream_destroy_rcu);
}

/* Must be called with RCU read-side lock held. */
bool viewer_stream_get(struct relay_viewer_stream *vstream)
{
	bool has_ref = false;

	pthread_mutex_lock(&vstream->reflock);
	if (vstream->ref.refcount != 0) {
		has_ref = true;
		urcu_ref_get(&vstream->ref);
	}
	pthread_mutex_unlock(&vstream->reflock);

	return has_ref;
}

/*
 * Get viewer stream by id.
 *
 * Return viewer stream if found else NULL.
 */
struct relay_viewer_stream *viewer_stream_get_by_id(uint64_t id)
{
	struct lttng_ht_node_u64 *node;
	struct lttng_ht_iter iter;
	struct relay_viewer_stream *vstream = NULL;

	rcu_read_lock();
	lttng_ht_lookup(viewer_streams_ht, &id, &iter);
	node = lttng_ht_iter_get_node_u64(&iter);
	if (!node) {
		DBG("Relay viewer stream %" PRIu64 " not found", id);
		goto end;
	}
	vstream = caa_container_of(node, struct relay_viewer_stream, stream_n);
	if (!viewer_stream_get(vstream)) {
		vstream = NULL;
	}
end:
	rcu_read_unlock();
	return vstream;
}

void viewer_stream_put(struct relay_viewer_stream *vstream)
{
	rcu_read_lock();
	pthread_mutex_lock(&vstream->reflock);
	urcu_ref_put(&vstream->ref, viewer_stream_release);
	pthread_mutex_unlock(&vstream->reflock);
	rcu_read_unlock();
}

/*
 * Rotate a stream to the next tracefile.
 *
 * Must be called with the rstream lock held.
 * Returns 0 on success, 1 on EOF, a negative value on error.
 */
int viewer_stream_rotate(struct relay_viewer_stream *vstream)
{
	int ret;
	struct relay_stream *stream = vstream->stream;
	uint64_t new_id;

	/* Detect the last tracefile to open. */
	if (stream->index_received_seqcount
			== vstream->index_sent_seqcount
			&& stream->trace->session->connection_closed) {
		ret = 1;
		goto end;
	}

	if (stream->tracefile_count == 0) {
		/* Ignore rotation, there is none to do. */
		ret = 0;
		goto end;
	}

	/*
	 * Try to move to the next file.
	 */
	new_id = (vstream->current_tracefile_id + 1)
			% stream->tracefile_count;
	if (tracefile_array_seq_in_file(stream->tfa, new_id,
			vstream->index_sent_seqcount)) {
		vstream->current_tracefile_id = new_id;
	} else {
		uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa);

		/*
		 * This can only be reached on overwrite, which implies there
		 * has been data written at some point, which will have set the
		 * tail.
		 */
		assert(seq_tail != -1ULL);
		/*
		 * We need to resync because we lag behind tail.
		 */
		vstream->current_tracefile_id =
			tracefile_array_get_file_index_tail(stream->tfa);
		vstream->index_sent_seqcount = seq_tail;
	}

	if (vstream->index_fd) {
		stream_fd_put(vstream->index_fd);
		vstream->index_fd = NULL;
	}
	if (vstream->stream_fd) {
		stream_fd_put(vstream->stream_fd);
		vstream->stream_fd = NULL;
	}

	ret = index_open(vstream->path_name, vstream->channel_name,
			stream->tracefile_count,
			vstream->current_tracefile_id);
	if (ret < 0) {
		goto end;
	}
	vstream->index_fd = stream_fd_create(ret);
	if (vstream->index_fd) {
		ret = 0;
	} else {
		if (close(ret)) {
			PERROR("close");
		}
		ret = -1;
	}
end:
	return ret;
}

void print_viewer_streams(void)
{
	struct lttng_ht_iter iter;
	struct relay_viewer_stream *vstream;

	rcu_read_lock();
	cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream,
			stream_n.node) {
		if (!viewer_stream_get(vstream)) {
			continue;
		}
		DBG("vstream %p refcount %ld stream %" PRIu64 " trace %" PRIu64
			" session %" PRIu64,
			vstream,
			vstream->ref.refcount,
			vstream->stream->stream_handle,
			vstream->stream->trace->id,
			vstream->stream->trace->session->id);
		viewer_stream_put(vstream);
	}
	rcu_read_unlock();
}
Commit	Line	Data
2f8f53af DG	1	/*
	2	* Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
	3	* David Goulet <dgoulet@efficios.com>
7591bab1	4	* 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
2f8f53af DG	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License, version 2 only, as
	8	* published by the Free Software Foundation.
	9	*
	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.
	14	*
	15	* You should have received a copy of the GNU General Public License along with
	16	* this program; if not, write to the Free Software Foundation, Inc., 51
	17	* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	18	*/
	19
	20	#define _GNU_SOURCE
6c1c0768	21	#define _LGPL_SOURCE
2f8f53af DG	22	#include <common/common.h>
2f8f53af DG	23	#include <common/index/index.h>
f5436bfc	24	#include <common/compat/string.h>
2f8f53af DG	25
	26	#include "lttng-relayd.h"
	27	#include "viewer-stream.h"
	28
7591bab1	29	static void viewer_stream_destroy(struct relay_viewer_stream *vstream)
2f8f53af	30	{
7591bab1 MD	31	free(vstream->path_name);
	32	free(vstream->channel_name);
	33	free(vstream);
2f8f53af DG	34	}
2f8f53af DG	35
7591bab1	36	static void viewer_stream_destroy_rcu(struct rcu_head *head)
2f8f53af	37	{
7591bab1	38	struct relay_viewer_stream *vstream =
2f8f53af DG	39	caa_container_of(head, struct relay_viewer_stream, rcu_node);
2f8f53af DG	40
7591bab1	41	viewer_stream_destroy(vstream);
2f8f53af DG	42	}
	43
	44	struct relay_viewer_stream viewer_stream_create(struct relay_stream stream,
7591bab1	45	enum lttng_viewer_seek seek_t)
2f8f53af DG	46	{
	47	struct relay_viewer_stream *vstream;
	48
2f8f53af DG	49	vstream = zmalloc(sizeof(*vstream));
	50	if (!vstream) {
	51	PERROR("relay viewer stream zmalloc");
	52	goto error;
	53	}
	54
f5436bfc	55	vstream->path_name = lttng_strndup(stream->path_name, LTTNG_VIEWER_PATH_MAX);
b272577e MD	56	if (vstream->path_name == NULL) {
	57	PERROR("relay viewer path_name alloc");
	58	goto error;
	59	}
f5436bfc	60	vstream->channel_name = lttng_strndup(stream->channel_name,
2f8f53af	61	LTTNG_VIEWER_NAME_MAX);
b272577e MD	62	if (vstream->channel_name == NULL) {
	63	PERROR("relay viewer channel_name alloc");
	64	goto error;
	65	}
2f8f53af	66
a44ca2ca MD	67	if (!stream_get(stream)) {
	68	ERR("Cannot get stream");
	69	goto error;
	70	}
	71	vstream->stream = stream;
	72
	73	pthread_mutex_lock(&stream->lock);
	74
	75	if (stream->is_metadata && stream->trace->viewer_metadata_stream) {
	76	ERR("Cannot attach viewer metadata stream to trace (busy).");
	77	goto error_unlock;
	78	}
	79
2f8f53af	80	switch (seek_t) {
c4e361a4	81	case LTTNG_VIEWER_SEEK_BEGINNING:
a44ca2ca MD	82	{
	83	uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa);
	84
	85	if (seq_tail == -1ULL) {
	86	/*
	87	* Tail may not be initialized yet. Nonetheless, we know
	88	* we want to send the first index once it becomes
	89	* available.
	90	*/
	91	seq_tail = 0;
	92	}
	93	vstream->current_tracefile_id =
	94	tracefile_array_get_file_index_tail(stream->tfa);
	95	vstream->index_sent_seqcount = seq_tail;
2f8f53af	96	break;
a44ca2ca	97	}
c4e361a4	98	case LTTNG_VIEWER_SEEK_LAST:
a44ca2ca MD	99	vstream->current_tracefile_id =
	100	tracefile_array_get_file_index_head(stream->tfa);
	101	/*
	102	* We seek at the very end of each stream, awaiting for
	103	* a future packet to eventually come in.
	104	*
	105	* We don't need to check the head position for -1ULL since the
	106	* increment will set it to 0.
	107	*/
	108	vstream->index_sent_seqcount =
	109	tracefile_array_get_seq_head(stream->tfa) + 1;
2f8f53af DG	110	break;
2f8f53af DG	111	default:
a44ca2ca	112	goto error_unlock;
2f8f53af	113	}
2f8f53af	114
2f8f53af	115	/*
a44ca2ca MD	116	* If we never received an index for the current stream, delay
a44ca2ca MD	117	* the opening of the index, otherwise open it right now.
2f8f53af	118	*/
a44ca2ca	119	if (stream->index_received_seqcount == 0) {
7591bab1	120	vstream->index_fd = NULL;
2f8f53af DG	121	} else {
	122	int read_fd;
	123
	124	read_fd = index_open(vstream->path_name, vstream->channel_name,
7591bab1 MD	125	stream->tracefile_count,
7591bab1 MD	126	vstream->current_tracefile_id);
2f8f53af	127	if (read_fd < 0) {
7591bab1 MD	128	goto error_unlock;
	129	}
	130	vstream->index_fd = stream_fd_create(read_fd);
	131	if (!vstream->index_fd) {
	132	if (close(read_fd)) {
	133	PERROR("close");
	134	}
	135	goto error_unlock;
2f8f53af	136	}
2f8f53af DG	137	}
2f8f53af DG	138
7591bab1	139	if (seek_t == LTTNG_VIEWER_SEEK_LAST && vstream->index_fd) {
2f8f53af DG	140	off_t lseek_ret;
2f8f53af DG	141
7591bab1	142	lseek_ret = lseek(vstream->index_fd->fd, 0, SEEK_END);
2f8f53af	143	if (lseek_ret < 0) {
7591bab1	144	goto error_unlock;
2f8f53af	145	}
7591bab1	146	}
7591bab1 MD	147	if (stream->is_metadata) {
	148	rcu_assign_pointer(stream->trace->viewer_metadata_stream,
	149	vstream);
2f8f53af	150	}
a44ca2ca	151	pthread_mutex_unlock(&stream->lock);
2f8f53af	152
7591bab1 MD	153	/* Globally visible after the add unique. */
	154	lttng_ht_node_init_u64(&vstream->stream_n, stream->stream_handle);
	155	lttng_ht_add_unique_u64(viewer_streams_ht, &vstream->stream_n);
	156
	157	pthread_mutex_init(&vstream->reflock, NULL);
	158	urcu_ref_init(&vstream->ref);
	159
2f8f53af DG	160	return vstream;
2f8f53af DG	161
7591bab1 MD	162	error_unlock:
7591bab1 MD	163	pthread_mutex_unlock(&stream->lock);
2f8f53af DG	164	error:
2f8f53af DG	165	if (vstream) {
7591bab1	166	viewer_stream_destroy(vstream);
2f8f53af DG	167	}
	168	return NULL;
	169	}
	170
7591bab1	171	static void viewer_stream_unpublish(struct relay_viewer_stream *vstream)
2f8f53af DG	172	{
	173	int ret;
	174	struct lttng_ht_iter iter;
	175
7591bab1	176	iter.iter.node = &vstream->stream_n.node;
2f8f53af DG	177	ret = lttng_ht_del(viewer_streams_ht, &iter);
	178	assert(!ret);
	179	}
	180
7591bab1	181	static void viewer_stream_release(struct urcu_ref *ref)
2f8f53af	182	{
7591bab1 MD	183	struct relay_viewer_stream *vstream = caa_container_of(ref,
7591bab1 MD	184	struct relay_viewer_stream, ref);
2a174661	185
7591bab1 MD	186	if (vstream->stream->is_metadata) {
7591bab1 MD	187	rcu_assign_pointer(vstream->stream->trace->viewer_metadata_stream, NULL);
2a174661	188	}
2f8f53af	189
7591bab1 MD	190	viewer_stream_unpublish(vstream);
	191
	192	if (vstream->stream_fd) {
	193	stream_fd_put(vstream->stream_fd);
	194	vstream->stream_fd = NULL;
2f8f53af	195	}
7591bab1 MD	196	if (vstream->index_fd) {
	197	stream_fd_put(vstream->index_fd);
	198	vstream->index_fd = NULL;
	199	}
	200	if (vstream->stream) {
	201	stream_put(vstream->stream);
	202	vstream->stream = NULL;
	203	}
	204	call_rcu(&vstream->rcu_node, viewer_stream_destroy_rcu);
	205	}
	206
	207	/* Must be called with RCU read-side lock held. */
	208	bool viewer_stream_get(struct relay_viewer_stream *vstream)
	209	{
	210	bool has_ref = false;
	211
	212	pthread_mutex_lock(&vstream->reflock);
	213	if (vstream->ref.refcount != 0) {
	214	has_ref = true;
	215	urcu_ref_get(&vstream->ref);
2f8f53af	216	}
7591bab1	217	pthread_mutex_unlock(&vstream->reflock);
2f8f53af	218
7591bab1	219	return has_ref;
2f8f53af DG	220	}
	221
	222	/*
7591bab1	223	* Get viewer stream by id.
2f8f53af	224	*
7591bab1	225	* Return viewer stream if found else NULL.
2f8f53af	226	*/
7591bab1	227	struct relay_viewer_stream *viewer_stream_get_by_id(uint64_t id)
2f8f53af DG	228	{
	229	struct lttng_ht_node_u64 *node;
	230	struct lttng_ht_iter iter;
7591bab1	231	struct relay_viewer_stream *vstream = NULL;
2f8f53af	232
7591bab1	233	rcu_read_lock();
2f8f53af DG	234	lttng_ht_lookup(viewer_streams_ht, &id, &iter);
	235	node = lttng_ht_iter_get_node_u64(&iter);
	236	if (!node) {
	237	DBG("Relay viewer stream %" PRIu64 " not found", id);
	238	goto end;
	239	}
7591bab1 MD	240	vstream = caa_container_of(node, struct relay_viewer_stream, stream_n);
	241	if (!viewer_stream_get(vstream)) {
	242	vstream = NULL;
	243	}
2f8f53af	244	end:
7591bab1 MD	245	rcu_read_unlock();
	246	return vstream;
	247	}
	248
	249	void viewer_stream_put(struct relay_viewer_stream *vstream)
	250	{
	251	rcu_read_lock();
	252	pthread_mutex_lock(&vstream->reflock);
	253	urcu_ref_put(&vstream->ref, viewer_stream_release);
	254	pthread_mutex_unlock(&vstream->reflock);
	255	rcu_read_unlock();
	256	}
	257
2f8f53af DG	258	/*
	259	* Rotate a stream to the next tracefile.
	260	*
7591bab1	261	* Must be called with the rstream lock held.
2f8f53af DG	262	* Returns 0 on success, 1 on EOF, a negative value on error.
2f8f53af DG	263	*/
7591bab1	264	int viewer_stream_rotate(struct relay_viewer_stream *vstream)
2f8f53af DG	265	{
2f8f53af DG	266	int ret;
7591bab1	267	struct relay_stream *stream = vstream->stream;
a44ca2ca	268	uint64_t new_id;
2f8f53af	269
7591bab1	270	/* Detect the last tracefile to open. */
a44ca2ca MD	271	if (stream->index_received_seqcount
a44ca2ca MD	272	== vstream->index_sent_seqcount
7591bab1 MD	273	&& stream->trace->session->connection_closed) {
7591bab1 MD	274	ret = 1;
2a174661 DG	275	goto end;
2a174661 DG	276	}
2f8f53af	277
7591bab1 MD	278	if (stream->tracefile_count == 0) {
	279	/* Ignore rotation, there is none to do. */
	280	ret = 0;
2f8f53af DG	281	goto end;
	282	}
	283
a44ca2ca MD	284	/*
	285	* Try to move to the next file.
	286	*/
	287	new_id = (vstream->current_tracefile_id + 1)
	288	% stream->tracefile_count;
	289	if (tracefile_array_seq_in_file(stream->tfa, new_id,
	290	vstream->index_sent_seqcount)) {
	291	vstream->current_tracefile_id = new_id;
2f8f53af	292	} else {
a44ca2ca MD	293	uint64_t seq_tail = tracefile_array_get_seq_tail(stream->tfa);
	294
	295	/*
	296	* This can only be reached on overwrite, which implies there
	297	* has been data written at some point, which will have set the
	298	* tail.
	299	*/
	300	assert(seq_tail != -1ULL);
	301	/*
	302	* We need to resync because we lag behind tail.
	303	*/
7591bab1	304	vstream->current_tracefile_id =
a44ca2ca MD	305	tracefile_array_get_file_index_tail(stream->tfa);
a44ca2ca MD	306	vstream->index_sent_seqcount = seq_tail;
2f8f53af	307	}
2f8f53af	308
7591bab1 MD	309	if (vstream->index_fd) {
	310	stream_fd_put(vstream->index_fd);
	311	vstream->index_fd = NULL;
2f8f53af	312	}
7591bab1 MD	313	if (vstream->stream_fd) {
	314	stream_fd_put(vstream->stream_fd);
	315	vstream->stream_fd = NULL;
2f8f53af	316	}
2f8f53af	317
2f8f53af	318	ret = index_open(vstream->path_name, vstream->channel_name,
7591bab1 MD	319	stream->tracefile_count,
7591bab1 MD	320	vstream->current_tracefile_id);
2f8f53af	321	if (ret < 0) {
7591bab1 MD	322	goto end;
	323	}
	324	vstream->index_fd = stream_fd_create(ret);
	325	if (vstream->index_fd) {
	326	ret = 0;
	327	} else {
	328	if (close(ret)) {
	329	PERROR("close");
	330	}
	331	ret = -1;
2f8f53af	332	}
2f8f53af	333	end:
2f8f53af DG	334	return ret;
2f8f53af DG	335	}
7591bab1 MD	336
	337	void print_viewer_streams(void)
	338	{
	339	struct lttng_ht_iter iter;
	340	struct relay_viewer_stream *vstream;
	341
	342	rcu_read_lock();
	343	cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream,
	344	stream_n.node) {
	345	if (!viewer_stream_get(vstream)) {
	346	continue;
	347	}
	348	DBG("vstream %p refcount %ld stream %" PRIu64 " trace %" PRIu64
	349	" session %" PRIu64,
	350	vstream,
	351	vstream->ref.refcount,
	352	vstream->stream->stream_handle,
	353	vstream->stream->trace->id,
	354	vstream->stream->trace->session->id);
	355	viewer_stream_put(vstream);
	356	}
	357	rcu_read_unlock();
	358	}