[lttng-tools.git] / ltt-sessiond / trace.c

/*
 * Copyright (C)  2011 - David Goulet <david.goulet@polymtl.ca>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; only version 2
 * of the License.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <urcu/list.h>

#include "lttngerr.h"
#include "trace.h"

/*
 *  get_kernel_channel_by_name
 *
 *  Find the channel name for the given kernel session.
 */
struct ltt_kernel_channel *get_kernel_channel_by_name(
		char *name, struct ltt_kernel_session *session)
{
	struct ltt_kernel_channel *chan;

	if (session == NULL) {
		ERR("Undefine session");
		goto error;
	}

	cds_list_for_each_entry(chan, &session->channel_list.head, list) {
		if (strcmp(name, chan->channel->name) == 0) {
			DBG("Found channel by name %s", name);
			return chan;
		}
	}

error:
	return NULL;
}

/*
 *  get_kernel_event_by_name
 *
 *  Find the event name for the given channel.
 */
struct ltt_kernel_event *get_kernel_event_by_name(
		char *name, struct ltt_kernel_channel *channel)
{
	struct ltt_kernel_event *ev;

	if (channel == NULL) {
		ERR("Undefine channel");
		goto error;
	}

	cds_list_for_each_entry(ev, &channel->events_list.head, list) {
		if (strcmp(name, ev->event->name) == 0) {
			DBG("Found event by name %s for channel %s", name,
					channel->channel->name);
			return ev;
		}
	}

error:
	return NULL;
}

/*
 *  trace_create_kernel_session
 *
 *  Allocate and initialize a kernel session data structure.
 *
 *  Return pointer to structure or NULL.
 */
struct ltt_kernel_session *trace_create_kernel_session(void)
{
	struct ltt_kernel_session *lks;

	/* Allocate a new ltt kernel session */
	lks = malloc(sizeof(struct ltt_kernel_session));
	if (lks == NULL) {
		perror("create kernel session malloc");
		goto error;
	}

	/* Init data structure */
	lks->fd = 0;
	lks->metadata_stream_fd = 0;
	lks->channel_count = 0;
	lks->stream_count_global = 0;
	lks->metadata = NULL;
	CDS_INIT_LIST_HEAD(&lks->channel_list.head);

	return lks;

error:
	return NULL;
}

/*
 *  trace_create_kernel_channel
 *
 *  Allocate and initialize a kernel channel data structure.
 *
 *  Return pointer to structure or NULL.
 */
struct ltt_kernel_channel *trace_create_kernel_channel(struct lttng_channel *chan, char *path)
{
	int ret;
	struct ltt_kernel_channel *lkc;

	lkc = malloc(sizeof(struct ltt_kernel_channel));
	if (lkc == NULL) {
		perror("ltt_kernel_channel malloc");
		goto error;
	}

	lkc->channel = malloc(sizeof(struct lttng_channel));
	if (lkc->channel == NULL) {
		perror("lttng_channel malloc");
		goto error;
	}
	memcpy(lkc->channel, chan, sizeof(struct lttng_channel));

	lkc->fd = 0;
	lkc->stream_count = 0;
	lkc->event_count = 0;
	lkc->enabled = 1;
	lkc->ctx = NULL;
	/* Init linked list */
	CDS_INIT_LIST_HEAD(&lkc->events_list.head);
	CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
	/* Set default trace output path */
	ret = asprintf(&lkc->pathname, "%s", path);
	if (ret < 0) {
		perror("asprintf kernel create channel");
		goto error;
	}

	return lkc;

error:
	return NULL;
}

/*
 *  trace_create_kernel_event
 *
 *  Allocate and initialize a kernel event. Set name and event type.
 *
 *  Return pointer to structure or NULL.
 */
struct ltt_kernel_event *trace_create_kernel_event(struct lttng_event *ev)
{
	struct ltt_kernel_event *lke;
	struct lttng_kernel_event *attr;

	lke = malloc(sizeof(struct ltt_kernel_event));
	attr = malloc(sizeof(struct lttng_kernel_event));
	if (lke == NULL || attr == NULL) {
		perror("kernel event malloc");
		goto error;
	}

	switch (ev->type) {
	case LTTNG_EVENT_PROBE:
		attr->instrumentation = LTTNG_KERNEL_KPROBE;
		attr->u.kprobe.addr = ev->attr.probe.addr;
		attr->u.kprobe.offset = ev->attr.probe.offset;
		strncpy(attr->u.kprobe.symbol_name,
				ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN);
		attr->u.kprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
		break;
	case LTTNG_EVENT_FUNCTION:
		attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
		attr->u.kretprobe.addr = ev->attr.probe.addr;
		attr->u.kretprobe.offset = ev->attr.probe.offset;
		attr->u.kretprobe.offset = ev->attr.probe.offset;
		strncpy(attr->u.kretprobe.symbol_name,
				ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN);
		attr->u.kretprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
		break;
	case LTTNG_EVENT_FUNCTION_ENTRY:
		attr->instrumentation = LTTNG_KERNEL_FUNCTION;
		strncpy(attr->u.ftrace.symbol_name,
				ev->attr.ftrace.symbol_name, LTTNG_SYM_NAME_LEN);
		attr->u.ftrace.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
		break;
	case LTTNG_EVENT_TRACEPOINT:
		attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
		break;
	default:
		ERR("Unknown kernel instrumentation type (%d)", ev->type);
		goto error;
	}

	/* Copy event name */
	strncpy(attr->name, ev->name, LTTNG_SYM_NAME_LEN);
	attr->name[LTTNG_SYM_NAME_LEN - 1] = '\0';

	/* Setting up a kernel event */
	lke->fd = 0;
	lke->event = attr;
	lke->enabled = 1;
	lke->ctx = NULL;

	return lke;

error:
	return NULL;
}

/*
 *  trace_create_kernel_metadata
 *
 *  Allocate and initialize a kernel metadata.
 *
 *  Return pointer to structure or NULL.
 */
struct ltt_kernel_metadata *trace_create_kernel_metadata(char *path)
{
	int ret;
	struct ltt_kernel_metadata *lkm;
	struct lttng_channel *chan;

	lkm = malloc(sizeof(struct ltt_kernel_metadata));
	chan = malloc(sizeof(struct lttng_channel));
	if (lkm == NULL || chan == NULL) {
		perror("kernel metadata malloc");
		goto error;
	}

	/* Set default attributes */
	chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
	chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
	chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
	chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
	chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
	chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;

	/* Init metadata */
	lkm->fd = 0;
	lkm->conf = chan;
	/* Set default metadata path */
	ret = asprintf(&lkm->pathname, "%s/metadata", path);
	if (ret < 0) {
		perror("asprintf kernel metadata");
		goto error;
	}

	return lkm;

error:
	return NULL;
}

/*
 *  trace_create_kernel_stream
 *
 *  Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
 *  default.
 *
 *  Return pointer to structure or NULL.
 */
struct ltt_kernel_stream *trace_create_kernel_stream(void)
{
	struct ltt_kernel_stream *lks;

	lks = malloc(sizeof(struct ltt_kernel_stream));
	if (lks == NULL) {
		perror("kernel stream malloc");
		goto error;
	}

	/* Init stream */
	lks->fd = 0;
	lks->pathname = NULL;
	lks->state = 0;

	return lks;

error:
	return NULL;
}

void trace_destroy_kernel_stream(struct ltt_kernel_stream *stream)
{
	DBG("[trace] Closing stream fd %d", stream->fd);
	/* Close kernel fd */
	close(stream->fd);
	free(stream->pathname);

	/* Remove from stream list */
	cds_list_del(&stream->list);
	free(stream);
}

void trace_destroy_kernel_event(struct ltt_kernel_event *event)
{
	DBG("[trace] Closing event fd %d", event->fd);
	/* Close kernel fd */
	close(event->fd);
	/* Free attributes */
	free(event->event);

	/* Remove from event list */
	cds_list_del(&event->list);
	free(event);
}

void trace_destroy_kernel_channel(struct ltt_kernel_channel *channel)
{
	struct ltt_kernel_stream *stream, *stmp;
	struct ltt_kernel_event *event, *etmp;

	DBG("[trace] Closing channel fd %d", channel->fd);
	/* Close kernel fd */
	close(channel->fd);
	free(channel->pathname);
	/* Free attributes structure */
	free(channel->channel);

	/* For each stream in the channel list */
	cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
		trace_destroy_kernel_stream(stream);
	}

	/* For each event in the channel list */
	cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
		trace_destroy_kernel_event(event);
	}

	/* Remove from channel list */
	cds_list_del(&channel->list);
	free(channel);
}

void trace_destroy_kernel_metadata(struct ltt_kernel_metadata *metadata)
{
	DBG("[trace] Closing metadata fd %d", metadata->fd);
	/* Close kernel fd */
	close(metadata->fd);
	/* Free attributes */
	free(metadata->conf);

	free(metadata);
}

void trace_destroy_kernel_session(struct ltt_kernel_session *session)
{
	struct ltt_kernel_channel *channel, *ctmp;

	DBG("[trace] Closing session fd %d", session->fd);
	/* Close kernel fds */
	close(session->fd);
	if (session->metadata_stream_fd != 0) {
		DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
		close(session->metadata_stream_fd);
	}

	if (session->metadata != NULL) {
		trace_destroy_kernel_metadata(session->metadata);
	}

	cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
		trace_destroy_kernel_channel(channel);
	}

	free(session);
}
Commit	Line	Data
54012638 DG	1	/*
	2	* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
82a3637f DG	6	* as published by the Free Software Foundation; only version 2
82a3637f DG	7	* of the License.
54012638 DG	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	17	*/
	18
	19	#define _GNU_SOURCE
	20	#include <stdio.h>
	21	#include <stdlib.h>
	22	#include <string.h>
c363b55d	23	#include <unistd.h>
54012638 DG	24	#include <urcu/list.h>
54012638 DG	25
33a2b854	26	#include "lttngerr.h"
54012638 DG	27	#include "trace.h"
54012638 DG	28
19e70852 DG	29	/*
	30	* get_kernel_channel_by_name
	31	*
	32	* Find the channel name for the given kernel session.
	33	*/
	34	struct ltt_kernel_channel *get_kernel_channel_by_name(
	35	char name, struct ltt_kernel_session session)
	36	{
	37	struct ltt_kernel_channel *chan;
	38
	39	if (session == NULL) {
	40	ERR("Undefine session");
	41	goto error;
	42	}
	43
	44	cds_list_for_each_entry(chan, &session->channel_list.head, list) {
	45	if (strcmp(name, chan->channel->name) == 0) {
	46	DBG("Found channel by name %s", name);
	47	return chan;
	48	}
	49	}
	50
	51	error:
	52	return NULL;
	53	}
	54
	55	/*
	56	* get_kernel_event_by_name
	57	*
	58	* Find the event name for the given channel.
	59	*/
	60	struct ltt_kernel_event *get_kernel_event_by_name(
	61	char name, struct ltt_kernel_channel channel)
	62	{
	63	struct ltt_kernel_event *ev;
	64
	65	if (channel == NULL) {
	66	ERR("Undefine channel");
	67	goto error;
	68	}
	69
	70	cds_list_for_each_entry(ev, &channel->events_list.head, list) {
	71	if (strcmp(name, ev->event->name) == 0) {
	72	DBG("Found event by name %s for channel %s", name,
	73	channel->channel->name);
	74	return ev;
	75	}
	76	}
	77
	78	error:
	79	return NULL;
	80	}
	81
54012638 DG	82	/*
	83	* trace_create_kernel_session
	84	*
	85	* Allocate and initialize a kernel session data structure.
	86	*
	87	* Return pointer to structure or NULL.
	88	*/
	89	struct ltt_kernel_session *trace_create_kernel_session(void)
	90	{
	91	struct ltt_kernel_session *lks;
	92
	93	/* Allocate a new ltt kernel session */
	94	lks = malloc(sizeof(struct ltt_kernel_session));
	95	if (lks == NULL) {
	96	perror("create kernel session malloc");
	97	goto error;
	98	}
	99
	100	/* Init data structure */
	101	lks->fd = 0;
	102	lks->metadata_stream_fd = 0;
	103	lks->channel_count = 0;
	104	lks->stream_count_global = 0;
	105	lks->metadata = NULL;
	106	CDS_INIT_LIST_HEAD(&lks->channel_list.head);
	107
	108	return lks;
	109
	110	error:
	111	return NULL;
	112	}
	113
	114	/*
	115	* trace_create_kernel_channel
	116	*
	117	* Allocate and initialize a kernel channel data structure.
	118	*
	119	* Return pointer to structure or NULL.
	120	*/
b082db07	121	struct ltt_kernel_channel trace_create_kernel_channel(struct lttng_channel chan, char *path)
54012638 DG	122	{
	123	int ret;
	124	struct ltt_kernel_channel *lkc;
54012638 DG	125
54012638 DG	126	lkc = malloc(sizeof(struct ltt_kernel_channel));
f3ed775e DG	127	if (lkc == NULL) {
f3ed775e DG	128	perror("ltt_kernel_channel malloc");
54012638 DG	129	goto error;
	130	}
	131
f3ed775e DG	132	lkc->channel = malloc(sizeof(struct lttng_channel));
	133	if (lkc->channel == NULL) {
	134	perror("lttng_channel malloc");
	135	goto error;
	136	}
	137	memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
54012638 DG	138
	139	lkc->fd = 0;
	140	lkc->stream_count = 0;
cbbbb275	141	lkc->event_count = 0;
d36b8583	142	lkc->enabled = 1;
e75cda3a	143	lkc->ctx = NULL;
54012638 DG	144	/* Init linked list */
	145	CDS_INIT_LIST_HEAD(&lkc->events_list.head);
	146	CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
	147	/* Set default trace output path */
b082db07	148	ret = asprintf(&lkc->pathname, "%s", path);
54012638 DG	149	if (ret < 0) {
	150	perror("asprintf kernel create channel");
	151	goto error;
	152	}
	153
	154	return lkc;
	155
	156	error:
	157	return NULL;
	158	}
	159
	160	/*
	161	* trace_create_kernel_event
	162	*
	163	* Allocate and initialize a kernel event. Set name and event type.
	164	*
	165	* Return pointer to structure or NULL.
	166	*/
f3ed775e	167	struct ltt_kernel_event trace_create_kernel_event(struct lttng_event ev)
54012638 DG	168	{
	169	struct ltt_kernel_event *lke;
	170	struct lttng_kernel_event *attr;
	171
	172	lke = malloc(sizeof(struct ltt_kernel_event));
	173	attr = malloc(sizeof(struct lttng_kernel_event));
	174	if (lke == NULL \|\| attr == NULL) {
	175	perror("kernel event malloc");
	176	goto error;
	177	}
	178
f3ed775e	179	switch (ev->type) {
7d29a247	180	case LTTNG_EVENT_PROBE:
e6ddca71	181	attr->instrumentation = LTTNG_KERNEL_KPROBE;
7d29a247 DG	182	attr->u.kprobe.addr = ev->attr.probe.addr;
7d29a247 DG	183	attr->u.kprobe.offset = ev->attr.probe.offset;
f3ed775e	184	strncpy(attr->u.kprobe.symbol_name,
7d29a247	185	ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN);
99497cd0	186	attr->u.kprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
f3ed775e DG	187	break;
f3ed775e DG	188	case LTTNG_EVENT_FUNCTION:
8f0d098b MD	189	attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
	190	attr->u.kretprobe.addr = ev->attr.probe.addr;
	191	attr->u.kretprobe.offset = ev->attr.probe.offset;
	192	attr->u.kretprobe.offset = ev->attr.probe.offset;
	193	strncpy(attr->u.kretprobe.symbol_name,
	194	ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN);
99497cd0	195	attr->u.kretprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
8f0d098b MD	196	break;
8f0d098b MD	197	case LTTNG_EVENT_FUNCTION_ENTRY:
f3ed775e DG	198	attr->instrumentation = LTTNG_KERNEL_FUNCTION;
	199	strncpy(attr->u.ftrace.symbol_name,
	200	ev->attr.ftrace.symbol_name, LTTNG_SYM_NAME_LEN);
99497cd0	201	attr->u.ftrace.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
f3ed775e	202	break;
e6ddca71 DG	203	case LTTNG_EVENT_TRACEPOINT:
e6ddca71 DG	204	attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
f3ed775e DG	205	break;
	206	default:
	207	ERR("Unknown kernel instrumentation type (%d)", ev->type);
	208	goto error;
	209	}
	210
	211	/* Copy event name */
	212	strncpy(attr->name, ev->name, LTTNG_SYM_NAME_LEN);
99497cd0	213	attr->name[LTTNG_SYM_NAME_LEN - 1] = '\0';
f3ed775e	214
54012638 DG	215	/* Setting up a kernel event */
	216	lke->fd = 0;
	217	lke->event = attr;
d36b8583	218	lke->enabled = 1;
e75cda3a	219	lke->ctx = NULL;
54012638 DG	220
	221	return lke;
	222
	223	error:
	224	return NULL;
	225	}
	226
	227	/*
	228	* trace_create_kernel_metadata
	229	*
	230	* Allocate and initialize a kernel metadata.
	231	*
	232	* Return pointer to structure or NULL.
	233	*/
58a97671	234	struct ltt_kernel_metadata trace_create_kernel_metadata(char path)
54012638 DG	235	{
	236	int ret;
	237	struct ltt_kernel_metadata *lkm;
f3ed775e	238	struct lttng_channel *chan;
54012638 DG	239
54012638 DG	240	lkm = malloc(sizeof(struct ltt_kernel_metadata));
f3ed775e DG	241	chan = malloc(sizeof(struct lttng_channel));
f3ed775e DG	242	if (lkm == NULL \|\| chan == NULL) {
54012638 DG	243	perror("kernel metadata malloc");
	244	goto error;
	245	}
	246
	247	/* Set default attributes */
f3ed775e DG	248	chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
	249	chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
	250	chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
	251	chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
	252	chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
7d452e12	253	chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
54012638 DG	254
	255	/* Init metadata */
	256	lkm->fd = 0;
f3ed775e	257	lkm->conf = chan;
54012638	258	/* Set default metadata path */
58a97671	259	ret = asprintf(&lkm->pathname, "%s/metadata", path);
54012638 DG	260	if (ret < 0) {
	261	perror("asprintf kernel metadata");
	262	goto error;
	263	}
	264
	265	return lkm;
	266
	267	error:
	268	return NULL;
	269	}
	270
	271	/*
	272	* trace_create_kernel_stream
	273	*
	274	* Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
	275	* default.
	276	*
	277	* Return pointer to structure or NULL.
	278	*/
	279	struct ltt_kernel_stream *trace_create_kernel_stream(void)
	280	{
	281	struct ltt_kernel_stream *lks;
	282
	283	lks = malloc(sizeof(struct ltt_kernel_stream));
	284	if (lks == NULL) {
	285	perror("kernel stream malloc");
	286	goto error;
	287	}
	288
	289	/* Init stream */
	290	lks->fd = 0;
	291	lks->pathname = NULL;
	292	lks->state = 0;
	293
	294	return lks;
	295
	296	error:
	297	return NULL;
	298	}
c363b55d DG	299
	300	void trace_destroy_kernel_stream(struct ltt_kernel_stream *stream)
	301	{
33a2b854	302	DBG("[trace] Closing stream fd %d", stream->fd);
c363b55d DG	303	/* Close kernel fd */
	304	close(stream->fd);
	305	free(stream->pathname);
	306
	307	/* Remove from stream list */
	308	cds_list_del(&stream->list);
	309	free(stream);
	310	}
	311
	312	void trace_destroy_kernel_event(struct ltt_kernel_event *event)
	313	{
33a2b854	314	DBG("[trace] Closing event fd %d", event->fd);
c363b55d DG	315	/* Close kernel fd */
	316	close(event->fd);
	317	/* Free attributes */
	318	free(event->event);
	319
	320	/* Remove from event list */
	321	cds_list_del(&event->list);
	322	free(event);
	323	}
	324
	325	void trace_destroy_kernel_channel(struct ltt_kernel_channel *channel)
	326	{
af9737e9 DG	327	struct ltt_kernel_stream stream, stmp;
af9737e9 DG	328	struct ltt_kernel_event event, etmp;
c363b55d	329
33a2b854	330	DBG("[trace] Closing channel fd %d", channel->fd);
c363b55d DG	331	/* Close kernel fd */
	332	close(channel->fd);
	333	free(channel->pathname);
	334	/* Free attributes structure */
	335	free(channel->channel);
	336
	337	/* For each stream in the channel list */
af9737e9	338	cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
c363b55d DG	339	trace_destroy_kernel_stream(stream);
	340	}
	341
	342	/* For each event in the channel list */
af9737e9	343	cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
c363b55d DG	344	trace_destroy_kernel_event(event);
	345	}
	346
	347	/* Remove from channel list */
	348	cds_list_del(&channel->list);
	349	free(channel);
	350	}
	351
	352	void trace_destroy_kernel_metadata(struct ltt_kernel_metadata *metadata)
	353	{
33a2b854	354	DBG("[trace] Closing metadata fd %d", metadata->fd);
c363b55d DG	355	/* Close kernel fd */
	356	close(metadata->fd);
	357	/* Free attributes */
	358	free(metadata->conf);
	359
	360	free(metadata);
	361	}
	362
	363	void trace_destroy_kernel_session(struct ltt_kernel_session *session)
	364	{
af9737e9	365	struct ltt_kernel_channel channel, ctmp;
c363b55d	366
33a2b854	367	DBG("[trace] Closing session fd %d", session->fd);
c363b55d DG	368	/* Close kernel fds */
c363b55d DG	369	close(session->fd);
70dc1c34 DG	370	if (session->metadata_stream_fd != 0) {
	371	DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
	372	close(session->metadata_stream_fd);
	373	}
c363b55d	374
d36b8583 DG	375	if (session->metadata != NULL) {
	376	trace_destroy_kernel_metadata(session->metadata);
	377	}
c363b55d	378
af9737e9	379	cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
c363b55d DG	380	trace_destroy_kernel_channel(channel);
	381	}
	382
	383	free(session);
	384	}