[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;
	lks->consumer_fd = 0;
	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_METADATA_SUBBUF_SIZE;
	chan->attr.num_subbuf = DEFAULT_METADATA_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;
d9800920	106	lks->consumer_fd = 0;
54012638 DG	107	CDS_INIT_LIST_HEAD(&lks->channel_list.head);
	108
	109	return lks;
	110
	111	error:
	112	return NULL;
	113	}
	114
	115	/*
	116	* trace_create_kernel_channel
	117	*
	118	* Allocate and initialize a kernel channel data structure.
	119	*
	120	* Return pointer to structure or NULL.
	121	*/
b082db07	122	struct ltt_kernel_channel trace_create_kernel_channel(struct lttng_channel chan, char *path)
54012638 DG	123	{
	124	int ret;
	125	struct ltt_kernel_channel *lkc;
54012638 DG	126
54012638 DG	127	lkc = malloc(sizeof(struct ltt_kernel_channel));
f3ed775e DG	128	if (lkc == NULL) {
f3ed775e DG	129	perror("ltt_kernel_channel malloc");
54012638 DG	130	goto error;
	131	}
	132
f3ed775e DG	133	lkc->channel = malloc(sizeof(struct lttng_channel));
	134	if (lkc->channel == NULL) {
	135	perror("lttng_channel malloc");
	136	goto error;
	137	}
	138	memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
54012638 DG	139
	140	lkc->fd = 0;
	141	lkc->stream_count = 0;
cbbbb275	142	lkc->event_count = 0;
d36b8583	143	lkc->enabled = 1;
e75cda3a	144	lkc->ctx = NULL;
54012638 DG	145	/* Init linked list */
	146	CDS_INIT_LIST_HEAD(&lkc->events_list.head);
	147	CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
	148	/* Set default trace output path */
b082db07	149	ret = asprintf(&lkc->pathname, "%s", path);
54012638 DG	150	if (ret < 0) {
	151	perror("asprintf kernel create channel");
	152	goto error;
	153	}
	154
	155	return lkc;
	156
	157	error:
	158	return NULL;
	159	}
	160
	161	/*
	162	* trace_create_kernel_event
	163	*
	164	* Allocate and initialize a kernel event. Set name and event type.
	165	*
	166	* Return pointer to structure or NULL.
	167	*/
f3ed775e	168	struct ltt_kernel_event trace_create_kernel_event(struct lttng_event ev)
54012638 DG	169	{
	170	struct ltt_kernel_event *lke;
	171	struct lttng_kernel_event *attr;
	172
	173	lke = malloc(sizeof(struct ltt_kernel_event));
	174	attr = malloc(sizeof(struct lttng_kernel_event));
	175	if (lke == NULL \|\| attr == NULL) {
	176	perror("kernel event malloc");
	177	goto error;
	178	}
	179
f3ed775e	180	switch (ev->type) {
7d29a247	181	case LTTNG_EVENT_PROBE:
e6ddca71	182	attr->instrumentation = LTTNG_KERNEL_KPROBE;
7d29a247 DG	183	attr->u.kprobe.addr = ev->attr.probe.addr;
7d29a247 DG	184	attr->u.kprobe.offset = ev->attr.probe.offset;
f3ed775e	185	strncpy(attr->u.kprobe.symbol_name,
7d29a247	186	ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN);
99497cd0	187	attr->u.kprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
f3ed775e DG	188	break;
f3ed775e DG	189	case LTTNG_EVENT_FUNCTION:
8f0d098b MD	190	attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
	191	attr->u.kretprobe.addr = ev->attr.probe.addr;
	192	attr->u.kretprobe.offset = ev->attr.probe.offset;
	193	attr->u.kretprobe.offset = ev->attr.probe.offset;
	194	strncpy(attr->u.kretprobe.symbol_name,
	195	ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN);
99497cd0	196	attr->u.kretprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
8f0d098b MD	197	break;
8f0d098b MD	198	case LTTNG_EVENT_FUNCTION_ENTRY:
f3ed775e DG	199	attr->instrumentation = LTTNG_KERNEL_FUNCTION;
	200	strncpy(attr->u.ftrace.symbol_name,
	201	ev->attr.ftrace.symbol_name, LTTNG_SYM_NAME_LEN);
99497cd0	202	attr->u.ftrace.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
f3ed775e	203	break;
e6ddca71 DG	204	case LTTNG_EVENT_TRACEPOINT:
e6ddca71 DG	205	attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
f3ed775e DG	206	break;
	207	default:
	208	ERR("Unknown kernel instrumentation type (%d)", ev->type);
	209	goto error;
	210	}
	211
	212	/* Copy event name */
	213	strncpy(attr->name, ev->name, LTTNG_SYM_NAME_LEN);
99497cd0	214	attr->name[LTTNG_SYM_NAME_LEN - 1] = '\0';
f3ed775e	215
54012638 DG	216	/* Setting up a kernel event */
	217	lke->fd = 0;
	218	lke->event = attr;
d36b8583	219	lke->enabled = 1;
e75cda3a	220	lke->ctx = NULL;
54012638 DG	221
	222	return lke;
	223
	224	error:
	225	return NULL;
	226	}
	227
	228	/*
	229	* trace_create_kernel_metadata
	230	*
	231	* Allocate and initialize a kernel metadata.
	232	*
	233	* Return pointer to structure or NULL.
	234	*/
58a97671	235	struct ltt_kernel_metadata trace_create_kernel_metadata(char path)
54012638 DG	236	{
	237	int ret;
	238	struct ltt_kernel_metadata *lkm;
f3ed775e	239	struct lttng_channel *chan;
54012638 DG	240
54012638 DG	241	lkm = malloc(sizeof(struct ltt_kernel_metadata));
f3ed775e DG	242	chan = malloc(sizeof(struct lttng_channel));
f3ed775e DG	243	if (lkm == NULL \|\| chan == NULL) {
54012638 DG	244	perror("kernel metadata malloc");
	245	goto error;
	246	}
	247
	248	/* Set default attributes */
f3ed775e	249	chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
b389abbe MD	250	chan->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
b389abbe MD	251	chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
f3ed775e DG	252	chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
f3ed775e DG	253	chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
7d452e12	254	chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
54012638 DG	255
	256	/* Init metadata */
	257	lkm->fd = 0;
f3ed775e	258	lkm->conf = chan;
54012638	259	/* Set default metadata path */
58a97671	260	ret = asprintf(&lkm->pathname, "%s/metadata", path);
54012638 DG	261	if (ret < 0) {
	262	perror("asprintf kernel metadata");
	263	goto error;
	264	}
	265
	266	return lkm;
	267
	268	error:
	269	return NULL;
	270	}
	271
	272	/*
	273	* trace_create_kernel_stream
	274	*
	275	* Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
	276	* default.
	277	*
	278	* Return pointer to structure or NULL.
	279	*/
	280	struct ltt_kernel_stream *trace_create_kernel_stream(void)
	281	{
	282	struct ltt_kernel_stream *lks;
	283
	284	lks = malloc(sizeof(struct ltt_kernel_stream));
	285	if (lks == NULL) {
	286	perror("kernel stream malloc");
	287	goto error;
	288	}
	289
	290	/* Init stream */
	291	lks->fd = 0;
	292	lks->pathname = NULL;
	293	lks->state = 0;
	294
	295	return lks;
	296
	297	error:
	298	return NULL;
	299	}
c363b55d DG	300
	301	void trace_destroy_kernel_stream(struct ltt_kernel_stream *stream)
	302	{
33a2b854	303	DBG("[trace] Closing stream fd %d", stream->fd);
c363b55d DG	304	/* Close kernel fd */
	305	close(stream->fd);
	306	free(stream->pathname);
	307
	308	/* Remove from stream list */
	309	cds_list_del(&stream->list);
	310	free(stream);
	311	}
	312
	313	void trace_destroy_kernel_event(struct ltt_kernel_event *event)
	314	{
33a2b854	315	DBG("[trace] Closing event fd %d", event->fd);
c363b55d DG	316	/* Close kernel fd */
	317	close(event->fd);
	318	/* Free attributes */
	319	free(event->event);
	320
	321	/* Remove from event list */
	322	cds_list_del(&event->list);
	323	free(event);
	324	}
	325
	326	void trace_destroy_kernel_channel(struct ltt_kernel_channel *channel)
	327	{
af9737e9 DG	328	struct ltt_kernel_stream stream, stmp;
af9737e9 DG	329	struct ltt_kernel_event event, etmp;
c363b55d	330
33a2b854	331	DBG("[trace] Closing channel fd %d", channel->fd);
c363b55d DG	332	/* Close kernel fd */
	333	close(channel->fd);
	334	free(channel->pathname);
	335	/* Free attributes structure */
	336	free(channel->channel);
	337
	338	/* For each stream in the channel list */
af9737e9	339	cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
c363b55d DG	340	trace_destroy_kernel_stream(stream);
	341	}
	342
	343	/* For each event in the channel list */
af9737e9	344	cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
c363b55d DG	345	trace_destroy_kernel_event(event);
	346	}
	347
	348	/* Remove from channel list */
	349	cds_list_del(&channel->list);
	350	free(channel);
	351	}
	352
	353	void trace_destroy_kernel_metadata(struct ltt_kernel_metadata *metadata)
	354	{
33a2b854	355	DBG("[trace] Closing metadata fd %d", metadata->fd);
c363b55d DG	356	/* Close kernel fd */
	357	close(metadata->fd);
	358	/* Free attributes */
	359	free(metadata->conf);
	360
	361	free(metadata);
	362	}
	363
	364	void trace_destroy_kernel_session(struct ltt_kernel_session *session)
	365	{
af9737e9	366	struct ltt_kernel_channel channel, ctmp;
c363b55d	367
33a2b854	368	DBG("[trace] Closing session fd %d", session->fd);
c363b55d DG	369	/* Close kernel fds */
c363b55d DG	370	close(session->fd);
70dc1c34 DG	371	if (session->metadata_stream_fd != 0) {
	372	DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
	373	close(session->metadata_stream_fd);
	374	}
c363b55d	375
d36b8583 DG	376	if (session->metadata != NULL) {
	377	trace_destroy_kernel_metadata(session->metadata);
	378	}
c363b55d	379
af9737e9	380	cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
c363b55d DG	381	trace_destroy_kernel_channel(channel);
	382	}
	383
	384	free(session);
	385	}