[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.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 <common/lttngerr.h>
#include <common/common.h>
#include <common/defaults.h>

#include "trace-kernel.h"

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

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

	DBG("Trying to find channel %s", name);

	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;
}

/*
 * Find the event name for the given channel.
 */
struct ltt_kernel_event *trace_kernel_get_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;
}

/*
 * Allocate and initialize a kernel session data structure.
 *
 * Return pointer to structure or NULL.
 */
struct ltt_kernel_session *trace_kernel_create_session(char *path)
{
	int ret;
	struct ltt_kernel_session *lks;

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

	/* Set session path */
	ret = asprintf(&lks->trace_path, "%s/kernel", path);
	if (ret < 0) {
		perror("asprintf kernel traces path");
		goto error;
	}

	return lks;

error:
	return NULL;
}

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

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

	lkc->channel = zmalloc(sizeof(struct lttng_channel));
	if (lkc->channel == NULL) {
		perror("lttng_channel zmalloc");
		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;
}

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

	lke = zmalloc(sizeof(struct ltt_kernel_event));
	attr = zmalloc(sizeof(struct lttng_kernel_event));
	if (lke == NULL || attr == NULL) {
		perror("kernel event zmalloc");
		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;
	case LTTNG_EVENT_SYSCALL:
		attr->instrumentation = LTTNG_KERNEL_SYSCALL;
		break;
	case LTTNG_EVENT_ALL:
		attr->instrumentation = LTTNG_KERNEL_ALL;
		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;
}

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

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

/*
 * 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_kernel_create_stream(void)
{
	struct ltt_kernel_stream *lks;

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

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

	return lks;

error:
	return NULL;
}

/*
 * Cleanup kernel stream structure.
 */
void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
{
	DBG("[trace] Closing stream fd %d", stream->fd);
	/* Close kernel fd */
	close(stream->fd);
	/* Remove from stream list */
	cds_list_del(&stream->list);

	free(stream->pathname);
	free(stream);
}

/*
 * Cleanup kernel event structure.
 */
void trace_kernel_destroy_event(struct ltt_kernel_event *event)
{
	DBG("[trace] Closing event fd %d", event->fd);
	/* Close kernel fd */
	close(event->fd);

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

	free(event->event);
	free(event->ctx);
	free(event);
}

/*
 * Cleanup kernel channel structure.
 */
void trace_kernel_destroy_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);

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

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

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

	free(channel->pathname);
	free(channel->channel);
	free(channel->ctx);
	free(channel);
}

/*
 * Cleanup kernel metadata structure.
 */
void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
{
	DBG("[trace] Closing metadata fd %d", metadata->fd);
	/* Close kernel fd */
	close(metadata->fd);

	free(metadata->conf);
	free(metadata->pathname);
	free(metadata);
}

/*
 * Cleanup kernel session structure
 */
void trace_kernel_destroy_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_kernel_destroy_metadata(session->metadata);
	}

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

	free(session->trace_path);
	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	24
10a8a223	25	#include <common/lttngerr.h>
990570ed DG	26	#include <common/common.h>
990570ed DG	27	#include <common/defaults.h>
1e307fab	28
62499ad6	29	#include "trace-kernel.h"
54012638	30
19e70852	31	/*
050349bb	32	* Find the channel name for the given kernel session.
19e70852	33	*/
62499ad6	34	struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
19e70852 DG	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
54d01ffb DG	44	DBG("Trying to find channel %s", name);
54d01ffb DG	45
19e70852 DG	46	cds_list_for_each_entry(chan, &session->channel_list.head, list) {
	47	if (strcmp(name, chan->channel->name) == 0) {
	48	DBG("Found channel by name %s", name);
	49	return chan;
	50	}
	51	}
	52
	53	error:
	54	return NULL;
	55	}
	56
	57	/*
050349bb	58	* Find the event name for the given channel.
19e70852	59	*/
62499ad6	60	struct ltt_kernel_event *trace_kernel_get_event_by_name(
19e70852 DG	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	82	/*
050349bb	83	* Allocate and initialize a kernel session data structure.
54012638	84	*
050349bb	85	* Return pointer to structure or NULL.
54012638	86	*/
f9815039	87	struct ltt_kernel_session trace_kernel_create_session(char path)
54012638	88	{
f9815039	89	int ret;
54012638 DG	90	struct ltt_kernel_session *lks;
	91
	92	/* Allocate a new ltt kernel session */
ba7f0ae5	93	lks = zmalloc(sizeof(struct ltt_kernel_session));
54012638	94	if (lks == NULL) {
ba7f0ae5	95	perror("create kernel session zmalloc");
54012638 DG	96	goto error;
	97	}
	98
	99	/* Init data structure */
	100	lks->fd = 0;
	101	lks->metadata_stream_fd = 0;
	102	lks->channel_count = 0;
	103	lks->stream_count_global = 0;
	104	lks->metadata = NULL;
d9800920	105	lks->consumer_fd = 0;
54012638 DG	106	CDS_INIT_LIST_HEAD(&lks->channel_list.head);
54012638 DG	107
f9815039 DG	108	/* Set session path */
	109	ret = asprintf(&lks->trace_path, "%s/kernel", path);
	110	if (ret < 0) {
	111	perror("asprintf kernel traces path");
	112	goto error;
	113	}
	114
54012638 DG	115	return lks;
	116
	117	error:
	118	return NULL;
	119	}
	120
	121	/*
050349bb	122	* Allocate and initialize a kernel channel data structure.
54012638	123	*
050349bb	124	* Return pointer to structure or NULL.
54012638	125	*/
62499ad6	126	struct ltt_kernel_channel trace_kernel_create_channel(struct lttng_channel chan, char *path)
54012638 DG	127	{
	128	int ret;
	129	struct ltt_kernel_channel *lkc;
54012638	130
ba7f0ae5	131	lkc = zmalloc(sizeof(struct ltt_kernel_channel));
f3ed775e	132	if (lkc == NULL) {
ba7f0ae5	133	perror("ltt_kernel_channel zmalloc");
54012638 DG	134	goto error;
	135	}
	136
ba7f0ae5	137	lkc->channel = zmalloc(sizeof(struct lttng_channel));
f3ed775e	138	if (lkc->channel == NULL) {
ba7f0ae5	139	perror("lttng_channel zmalloc");
f3ed775e DG	140	goto error;
	141	}
	142	memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
54012638 DG	143
	144	lkc->fd = 0;
	145	lkc->stream_count = 0;
cbbbb275	146	lkc->event_count = 0;
d36b8583	147	lkc->enabled = 1;
e75cda3a	148	lkc->ctx = NULL;
54012638 DG	149	/* Init linked list */
	150	CDS_INIT_LIST_HEAD(&lkc->events_list.head);
	151	CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
	152	/* Set default trace output path */
b082db07	153	ret = asprintf(&lkc->pathname, "%s", path);
54012638 DG	154	if (ret < 0) {
	155	perror("asprintf kernel create channel");
	156	goto error;
	157	}
	158
	159	return lkc;
	160
	161	error:
	162	return NULL;
	163	}
	164
	165	/*
050349bb	166	* Allocate and initialize a kernel event. Set name and event type.
54012638	167	*
050349bb	168	* Return pointer to structure or NULL.
54012638	169	*/
62499ad6	170	struct ltt_kernel_event trace_kernel_create_event(struct lttng_event ev)
54012638 DG	171	{
	172	struct ltt_kernel_event *lke;
	173	struct lttng_kernel_event *attr;
	174
ba7f0ae5 DG	175	lke = zmalloc(sizeof(struct ltt_kernel_event));
ba7f0ae5 DG	176	attr = zmalloc(sizeof(struct lttng_kernel_event));
54012638	177	if (lke == NULL \|\| attr == NULL) {
ba7f0ae5	178	perror("kernel event zmalloc");
54012638 DG	179	goto error;
	180	}
	181
f3ed775e	182	switch (ev->type) {
7d29a247	183	case LTTNG_EVENT_PROBE:
e6ddca71	184	attr->instrumentation = LTTNG_KERNEL_KPROBE;
7d29a247 DG	185	attr->u.kprobe.addr = ev->attr.probe.addr;
7d29a247 DG	186	attr->u.kprobe.offset = ev->attr.probe.offset;
f3ed775e	187	strncpy(attr->u.kprobe.symbol_name,
7d29a247	188	ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN);
99497cd0	189	attr->u.kprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
f3ed775e DG	190	break;
f3ed775e DG	191	case LTTNG_EVENT_FUNCTION:
8f0d098b MD	192	attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
	193	attr->u.kretprobe.addr = ev->attr.probe.addr;
	194	attr->u.kretprobe.offset = ev->attr.probe.offset;
	195	attr->u.kretprobe.offset = ev->attr.probe.offset;
	196	strncpy(attr->u.kretprobe.symbol_name,
	197	ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN);
99497cd0	198	attr->u.kretprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
8f0d098b MD	199	break;
8f0d098b MD	200	case LTTNG_EVENT_FUNCTION_ENTRY:
f3ed775e DG	201	attr->instrumentation = LTTNG_KERNEL_FUNCTION;
	202	strncpy(attr->u.ftrace.symbol_name,
	203	ev->attr.ftrace.symbol_name, LTTNG_SYM_NAME_LEN);
99497cd0	204	attr->u.ftrace.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0';
f3ed775e	205	break;
e6ddca71 DG	206	case LTTNG_EVENT_TRACEPOINT:
e6ddca71 DG	207	attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
f3ed775e	208	break;
a54bd42d MD	209	case LTTNG_EVENT_SYSCALL:
a54bd42d MD	210	attr->instrumentation = LTTNG_KERNEL_SYSCALL;
0133c199	211	break;
7a3d1328 MD	212	case LTTNG_EVENT_ALL:
	213	attr->instrumentation = LTTNG_KERNEL_ALL;
	214	break;
f3ed775e DG	215	default:
	216	ERR("Unknown kernel instrumentation type (%d)", ev->type);
	217	goto error;
	218	}
	219
	220	/* Copy event name */
	221	strncpy(attr->name, ev->name, LTTNG_SYM_NAME_LEN);
99497cd0	222	attr->name[LTTNG_SYM_NAME_LEN - 1] = '\0';
f3ed775e	223
54012638 DG	224	/* Setting up a kernel event */
	225	lke->fd = 0;
	226	lke->event = attr;
d36b8583	227	lke->enabled = 1;
e75cda3a	228	lke->ctx = NULL;
54012638 DG	229
	230	return lke;
	231
	232	error:
	233	return NULL;
	234	}
	235
	236	/*
050349bb	237	* Allocate and initialize a kernel metadata.
54012638	238	*
050349bb	239	* Return pointer to structure or NULL.
54012638	240	*/
62499ad6	241	struct ltt_kernel_metadata trace_kernel_create_metadata(char path)
54012638 DG	242	{
	243	int ret;
	244	struct ltt_kernel_metadata *lkm;
f3ed775e	245	struct lttng_channel *chan;
54012638	246
ba7f0ae5 DG	247	lkm = zmalloc(sizeof(struct ltt_kernel_metadata));
ba7f0ae5 DG	248	chan = zmalloc(sizeof(struct lttng_channel));
f3ed775e	249	if (lkm == NULL \|\| chan == NULL) {
ba7f0ae5	250	perror("kernel metadata zmalloc");
54012638 DG	251	goto error;
	252	}
	253
	254	/* Set default attributes */
f3ed775e	255	chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
b389abbe MD	256	chan->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
b389abbe MD	257	chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
f3ed775e DG	258	chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
f3ed775e DG	259	chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
7d452e12	260	chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
54012638 DG	261
	262	/* Init metadata */
	263	lkm->fd = 0;
f3ed775e	264	lkm->conf = chan;
54012638	265	/* Set default metadata path */
58a97671	266	ret = asprintf(&lkm->pathname, "%s/metadata", path);
54012638 DG	267	if (ret < 0) {
	268	perror("asprintf kernel metadata");
	269	goto error;
	270	}
	271
	272	return lkm;
	273
	274	error:
	275	return NULL;
	276	}
	277
	278	/*
050349bb DG	279	* Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
050349bb DG	280	* default.
54012638	281	*
050349bb	282	* Return pointer to structure or NULL.
54012638	283	*/
62499ad6	284	struct ltt_kernel_stream *trace_kernel_create_stream(void)
54012638 DG	285	{
	286	struct ltt_kernel_stream *lks;
	287
ba7f0ae5	288	lks = zmalloc(sizeof(struct ltt_kernel_stream));
54012638	289	if (lks == NULL) {
ba7f0ae5	290	perror("kernel stream zmalloc");
54012638 DG	291	goto error;
	292	}
	293
	294	/* Init stream */
	295	lks->fd = 0;
	296	lks->pathname = NULL;
	297	lks->state = 0;
	298
	299	return lks;
	300
	301	error:
	302	return NULL;
	303	}
c363b55d	304
050349bb DG	305	/*
	306	* Cleanup kernel stream structure.
	307	*/
62499ad6	308	void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
c363b55d	309	{
33a2b854	310	DBG("[trace] Closing stream fd %d", stream->fd);
c363b55d DG	311	/* Close kernel fd */
c363b55d DG	312	close(stream->fd);
c363b55d DG	313	/* Remove from stream list */
c363b55d DG	314	cds_list_del(&stream->list);
f9815039 DG	315
f9815039 DG	316	free(stream->pathname);
c363b55d DG	317	free(stream);
	318	}
	319
050349bb DG	320	/*
	321	* Cleanup kernel event structure.
	322	*/
62499ad6	323	void trace_kernel_destroy_event(struct ltt_kernel_event *event)
c363b55d	324	{
33a2b854	325	DBG("[trace] Closing event fd %d", event->fd);
c363b55d DG	326	/* Close kernel fd */
c363b55d DG	327	close(event->fd);
c363b55d DG	328
	329	/* Remove from event list */
	330	cds_list_del(&event->list);
f9815039 DG	331
	332	free(event->event);
	333	free(event->ctx);
c363b55d DG	334	free(event);
	335	}
	336
050349bb DG	337	/*
	338	* Cleanup kernel channel structure.
	339	*/
62499ad6	340	void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
c363b55d	341	{
af9737e9 DG	342	struct ltt_kernel_stream stream, stmp;
af9737e9 DG	343	struct ltt_kernel_event event, etmp;
c363b55d	344
33a2b854	345	DBG("[trace] Closing channel fd %d", channel->fd);
c363b55d DG	346	/* Close kernel fd */
c363b55d DG	347	close(channel->fd);
c363b55d DG	348
c363b55d DG	349	/* For each stream in the channel list */
af9737e9	350	cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
62499ad6	351	trace_kernel_destroy_stream(stream);
c363b55d DG	352	}
	353
	354	/* For each event in the channel list */
af9737e9	355	cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
62499ad6	356	trace_kernel_destroy_event(event);
c363b55d DG	357	}
	358
	359	/* Remove from channel list */
	360	cds_list_del(&channel->list);
f9815039 DG	361
	362	free(channel->pathname);
	363	free(channel->channel);
	364	free(channel->ctx);
c363b55d DG	365	free(channel);
	366	}
	367
050349bb DG	368	/*
	369	* Cleanup kernel metadata structure.
	370	*/
62499ad6	371	void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
c363b55d	372	{
33a2b854	373	DBG("[trace] Closing metadata fd %d", metadata->fd);
c363b55d DG	374	/* Close kernel fd */
c363b55d DG	375	close(metadata->fd);
c363b55d	376
f9815039 DG	377	free(metadata->conf);
f9815039 DG	378	free(metadata->pathname);
c363b55d DG	379	free(metadata);
	380	}
	381
050349bb	382	/*
62499ad6	383	* Cleanup kernel session structure
050349bb	384	*/
62499ad6	385	void trace_kernel_destroy_session(struct ltt_kernel_session *session)
c363b55d	386	{
af9737e9	387	struct ltt_kernel_channel channel, ctmp;
c363b55d	388
33a2b854	389	DBG("[trace] Closing session fd %d", session->fd);
c363b55d DG	390	/* Close kernel fds */
c363b55d DG	391	close(session->fd);
f9815039	392
70dc1c34 DG	393	if (session->metadata_stream_fd != 0) {
	394	DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
	395	close(session->metadata_stream_fd);
	396	}
c363b55d	397
d36b8583	398	if (session->metadata != NULL) {
62499ad6	399	trace_kernel_destroy_metadata(session->metadata);
d36b8583	400	}
c363b55d	401
af9737e9	402	cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
62499ad6	403	trace_kernel_destroy_channel(channel);
c363b55d DG	404	}
c363b55d DG	405
f9815039	406	free(session->trace_path);
c363b55d DG	407	free(session);
c363b55d DG	408	}