[lttng-tools.git] / lttng-sessiond / trace-ust.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 <lttngerr.h>
#include <lttng-share.h>

#include "hashtable.h"
#include "trace-ust.h"

/*
 * Find the channel in the hashtable.
 */
struct ltt_ust_channel *trace_ust_find_channel_by_name(struct cds_lfht *ht,
		char *name)
{
	struct cds_lfht_node *node;
	struct cds_lfht_iter iter;

	rcu_read_lock();
	node = hashtable_lookup(ht, (void *) name, strlen(name), &iter);
	if (node == NULL) {
		rcu_read_unlock();
		goto error;
	}
	rcu_read_unlock();

	DBG2("Trace UST channel %s found by name", name);

	return caa_container_of(node, struct ltt_ust_channel, node);

error:
	DBG2("Trace UST channel %s not found by name", name);
	return NULL;
}

/*
 * Find the event in the hashtable.
 */
struct ltt_ust_event *trace_ust_find_event_by_name(struct cds_lfht *ht,
		char *name)
{
	struct cds_lfht_node *node;
	struct cds_lfht_iter iter;

	rcu_read_lock();
	node = hashtable_lookup(ht, (void *) name, strlen(name), &iter);
	if (node == NULL) {
		rcu_read_unlock();
		goto error;
	}
	rcu_read_unlock();

	DBG2("Found UST event by name %s", name);

	return caa_container_of(node, struct ltt_ust_event, node);

error:
	return NULL;
}

/*
 * Allocate and initialize a ust session data structure.
 *
 * Return pointer to structure or NULL.
 */
struct ltt_ust_session *trace_ust_create_session(char *path, unsigned int uid,
		struct lttng_domain *domain)
{
	int ret;
	struct ltt_ust_session *lus;

	/* Allocate a new ltt ust session */
	lus = malloc(sizeof(struct ltt_ust_session));
	if (lus == NULL) {
		perror("create ust session malloc");
		goto error;
	}

	/* Init data structure */
	lus->consumer_fds_sent = 0;
	lus->uid = uid;

	/* Alloc UST domain hash tables */
	lus->domain_pid = hashtable_new(0);
	lus->domain_exec = hashtable_new_str(0);

	/* Alloc UST global domain channels' HT */
	lus->domain_global.channels = hashtable_new_str(0);

	/* Set session path */
	ret = snprintf(lus->pathname, PATH_MAX, "%s/ust", path);
	if (ret < 0) {
		PERROR("snprintf kernel traces path");
		goto error;
	}

	DBG2("UST trace session create successful");

	return lus;

error:
	return NULL;
}

/*
 * Allocate and initialize a ust channel data structure.
 *
 * Return pointer to structure or NULL.
 */
struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan,
		char *path)
{
	int ret;
	struct ltt_ust_channel *luc;

	luc = malloc(sizeof(struct ltt_ust_channel));
	if (luc == NULL) {
		perror("ltt_ust_channel malloc");
		goto error;
	}

	/* Copy UST channel attributes */
	luc->attr.overwrite = chan->attr.overwrite;
	luc->attr.subbuf_size = chan->attr.subbuf_size;
	luc->attr.num_subbuf = chan->attr.num_subbuf;
	luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
	luc->attr.read_timer_interval = chan->attr.read_timer_interval;
	luc->attr.output = chan->attr.output;

	/* Translate to UST output enum */
	switch (luc->attr.output) {
	default:
		luc->attr.output = LTTNG_UST_MMAP;
		break;
	}

	/* Copy channel name */
	strncpy(luc->name, chan->name, sizeof(&luc->name));
	luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';

	/* Init node */
	hashtable_node_init(&luc->node, (void *) luc->name, strlen(luc->name));
	/* Alloc hash tables */
	luc->events = hashtable_new_str(0);
	luc->ctx = hashtable_new_str(0);

	/* Set trace output path */
	ret = snprintf(luc->pathname, PATH_MAX, "%s", path);
	if (ret < 0) {
		perror("asprintf ust create channel");
		goto error;
	}

	DBG2("Trace UST channel %s created", luc->name);

	return luc;

error:
	return NULL;
}

/*
 * Allocate and initialize a ust event. Set name and event type.
 *
 * Return pointer to structure or NULL.
 */
struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev)
{
	struct ltt_ust_event *lue;

	lue = malloc(sizeof(struct ltt_ust_event));
	if (lue == NULL) {
		PERROR("ust event malloc");
		goto error;
	}

	switch (ev->type) {
	case LTTNG_EVENT_PROBE:
		lue->attr.instrumentation = LTTNG_UST_PROBE;
		break;
	case LTTNG_EVENT_FUNCTION:
		lue->attr.instrumentation = LTTNG_UST_FUNCTION;
		break;
	case LTTNG_EVENT_FUNCTION_ENTRY:
		lue->attr.instrumentation = LTTNG_UST_FUNCTION;
		break;
	case LTTNG_EVENT_TRACEPOINT:
		lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
		break;
	default:
		ERR("Unknown ust instrumentation type (%d)", ev->type);
		goto error;
	}

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

	/* Init node */
	hashtable_node_init(&lue->node, (void *) lue->attr.name,
			strlen(lue->attr.name));
	/* Alloc context hash tables */
	lue->ctx = hashtable_new_str(5);

	return lue;

error:
	return NULL;
}

/*
 * Allocate and initialize a ust metadata.
 *
 * Return pointer to structure or NULL.
 */
struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
{
	int ret;
	struct ltt_ust_metadata *lum;

	lum = malloc(sizeof(struct ltt_ust_metadata));
	if (lum == NULL) {
		perror("ust metadata malloc");
		goto error;
	}

	/* Set default attributes */
	lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
	lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
	lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
	lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
	lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
	lum->attr.output = DEFAULT_UST_CHANNEL_OUTPUT;

	lum->handle = -1;
	/* Set metadata trace path */
	ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path);
	if (ret < 0) {
		perror("asprintf ust metadata");
		goto error;
	}

	return lum;

error:
	return NULL;
}

/*
 * RCU safe free context structure.
 */
static void destroy_context_rcu(struct rcu_head *head)
{
	struct cds_lfht_node *node =
		caa_container_of(head, struct cds_lfht_node, head);
	struct ltt_ust_context *ctx =
		caa_container_of(node, struct ltt_ust_context, node);

	free(ctx);
}

/*
 * Cleanup UST context hash table.
 */
static void destroy_context(struct cds_lfht *ht)
{
	int ret;
	struct cds_lfht_node *node;
	struct cds_lfht_iter iter;

	hashtable_get_first(ht, &iter);
	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
		ret = hashtable_del(ht, &iter);
		if (!ret) {
			call_rcu(&node->head, destroy_context_rcu);
		}
		hashtable_get_next(ht, &iter);
	}
}

/*
 * Cleanup ust event structure.
 */
void trace_ust_destroy_event(struct ltt_ust_event *event)
{
	DBG2("Trace destroy UST event %s", event->attr.name);
	destroy_context(event->ctx);
	free(event);
}

/*
 * URCU intermediate call to complete destroy event.
 */
static void destroy_event_rcu(struct rcu_head *head)
{
	struct cds_lfht_node *node =
		caa_container_of(head, struct cds_lfht_node, head);
	struct ltt_ust_event *event =
		caa_container_of(node, struct ltt_ust_event, node);

	trace_ust_destroy_event(event);
}

/*
 * Cleanup ust channel structure.
 */
void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
{
	int ret;
	struct cds_lfht_node *node;
	struct cds_lfht_iter iter;

	DBG2("Trace destroy UST channel %s", channel->name);

	rcu_read_lock();

	hashtable_get_first(channel->events, &iter);
	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
		ret = hashtable_del(channel->events, &iter);
		if (!ret) {
			call_rcu(&node->head, destroy_event_rcu);
		}
		hashtable_get_next(channel->events, &iter);
	}

	free(channel->events);
	destroy_context(channel->ctx);
	free(channel);

	rcu_read_unlock();
}

/*
 * URCU intermediate call to complete destroy channel.
 */
static void destroy_channel_rcu(struct rcu_head *head)
{
	struct cds_lfht_node *node =
		caa_container_of(head, struct cds_lfht_node, head);
	struct ltt_ust_channel *channel =
		caa_container_of(node, struct ltt_ust_channel, node);

	trace_ust_destroy_channel(channel);
}

/*
 * Cleanup ust metadata structure.
 */
void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
{
	DBG2("Trace UST destroy metadata %d", metadata->handle);

	free(metadata);
}

/*
 * Iterate over a hash table containing channels and cleanup safely.
 */
static void destroy_channels(struct cds_lfht *channels)
{
	int ret;
	struct cds_lfht_node *node;
	struct cds_lfht_iter iter;

	hashtable_get_first(channels, &iter);
	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
		ret = hashtable_del(channels, &iter);
		if (!ret) {
			call_rcu(&node->head, destroy_channel_rcu);
		}
		hashtable_get_next(channels, &iter);
	}
}

/*
 * Cleanup UST pid domain.
 */
static void destroy_domain_pid(struct cds_lfht *ht)
{
	int ret;
	struct cds_lfht_node *node;
	struct cds_lfht_iter iter;
	struct ltt_ust_domain_pid *d;

	hashtable_get_first(ht, &iter);
	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
		ret = hashtable_del(ht , &iter);
		if (!ret) {
			d = caa_container_of(node, struct ltt_ust_domain_pid, node);
			destroy_channels(d->channels);
		}
		hashtable_get_next(ht, &iter);
	}
}

/*
 * Cleanup UST exec name domain.
 */
static void destroy_domain_exec(struct cds_lfht *ht)
{
	int ret;
	struct cds_lfht_node *node;
	struct cds_lfht_iter iter;
	struct ltt_ust_domain_exec *d;

	hashtable_get_first(ht, &iter);
	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
		ret = hashtable_del(ht , &iter);
		if (!ret) {
			d = caa_container_of(node, struct ltt_ust_domain_exec, node);
			destroy_channels(d->channels);
		}
		hashtable_get_next(ht, &iter);
	}
}

/*
 * Cleanup UST global domain.
 */
static void destroy_domain_global(struct ltt_ust_domain_global *dom)
{
	destroy_channels(dom->channels);
}

/*
 * Cleanup ust session structure
 */
void trace_ust_destroy_session(struct ltt_ust_session *session)
{
	/* Extra safety */
	if (session == NULL) {
		return;
	}

	rcu_read_lock();

	DBG2("Trace UST destroy session %d", session->uid);

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

	/* Cleaning up UST domain */
	destroy_domain_global(&session->domain_global);
	destroy_domain_pid(session->domain_pid);
	destroy_domain_exec(session->domain_exec);

	free(session);

	rcu_read_unlock();
}
Commit	Line	Data
97ee3a89 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 modify it
	5	* under the terms of the GNU General Public License as published by the Free
	6	* Software Foundation; only version 2 of the License.
	7	*
	8	* This program is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	15	* Place - Suite 330, Boston, MA 02111-1307, USA.
	16	*/
	17
	18	#define _GNU_SOURCE
	19	#include <stdio.h>
	20	#include <stdlib.h>
	21	#include <string.h>
	22	#include <unistd.h>
	23
	24	#include <lttngerr.h>
	25	#include <lttng-share.h>
	26
f6a9efaa	27	#include "hashtable.h"
97ee3a89 DG	28	#include "trace-ust.h"
97ee3a89 DG	29
0177d773	30	/*
f6a9efaa	31	* Find the channel in the hashtable.
0177d773	32	*/
f6a9efaa DG	33	struct ltt_ust_channel trace_ust_find_channel_by_name(struct cds_lfht ht,
f6a9efaa DG	34	char *name)
0177d773	35	{
f6a9efaa DG	36	struct cds_lfht_node *node;
f6a9efaa DG	37	struct cds_lfht_iter iter;
0177d773	38
f6a9efaa DG	39	rcu_read_lock();
	40	node = hashtable_lookup(ht, (void *) name, strlen(name), &iter);
	41	if (node == NULL) {
	42	rcu_read_unlock();
44d3bd01 DG	43	goto error;
44d3bd01 DG	44	}
f6a9efaa	45	rcu_read_unlock();
44d3bd01	46
f6a9efaa	47	DBG2("Trace UST channel %s found by name", name);
0177d773	48
f6a9efaa	49	return caa_container_of(node, struct ltt_ust_channel, node);
97ee3a89 DG	50
97ee3a89 DG	51	error:
f6a9efaa	52	DBG2("Trace UST channel %s not found by name", name);
97ee3a89 DG	53	return NULL;
	54	}
	55
	56	/*
f6a9efaa	57	* Find the event in the hashtable.
97ee3a89	58	*/
f6a9efaa DG	59	struct ltt_ust_event trace_ust_find_event_by_name(struct cds_lfht ht,
f6a9efaa DG	60	char *name)
97ee3a89	61	{
f6a9efaa DG	62	struct cds_lfht_node *node;
f6a9efaa DG	63	struct cds_lfht_iter iter;
97ee3a89	64
f6a9efaa DG	65	rcu_read_lock();
	66	node = hashtable_lookup(ht, (void *) name, strlen(name), &iter);
	67	if (node == NULL) {
	68	rcu_read_unlock();
97ee3a89 DG	69	goto error;
97ee3a89 DG	70	}
f6a9efaa	71	rcu_read_unlock();
97ee3a89	72
f6a9efaa DG	73	DBG2("Found UST event by name %s", name);
	74
	75	return caa_container_of(node, struct ltt_ust_event, node);
97ee3a89 DG	76
	77	error:
	78	return NULL;
	79	}
	80
	81	/*
	82	* Allocate and initialize a ust session data structure.
	83	*
	84	* Return pointer to structure or NULL.
	85	*/
48842b30	86	struct ltt_ust_session trace_ust_create_session(char path, unsigned int uid,
44d3bd01	87	struct lttng_domain *domain)
97ee3a89	88	{
0177d773	89	int ret;
97ee3a89 DG	90	struct ltt_ust_session *lus;
	91
	92	/* Allocate a new ltt ust session */
	93	lus = malloc(sizeof(struct ltt_ust_session));
	94	if (lus == NULL) {
	95	perror("create ust session malloc");
	96	goto error;
	97	}
	98
	99	/* Init data structure */
3bd1e081	100	lus->consumer_fds_sent = 0;
48842b30	101	lus->uid = uid;
97ee3a89	102
f6a9efaa DG	103	/* Alloc UST domain hash tables */
	104	lus->domain_pid = hashtable_new(0);
	105	lus->domain_exec = hashtable_new_str(0);
	106
	107	/* Alloc UST global domain channels' HT */
	108	lus->domain_global.channels = hashtable_new_str(0);
44d3bd01	109
0177d773	110	/* Set session path */
48842b30	111	ret = snprintf(lus->pathname, PATH_MAX, "%s/ust", path);
0177d773	112	if (ret < 0) {
44d3bd01	113	PERROR("snprintf kernel traces path");
0177d773 DG	114	goto error;
	115	}
	116
44d3bd01 DG	117	DBG2("UST trace session create successful");
44d3bd01 DG	118
97ee3a89 DG	119	return lus;
	120
	121	error:
	122	return NULL;
	123	}
	124
	125	/*
	126	* Allocate and initialize a ust channel data structure.
	127	*
	128	* Return pointer to structure or NULL.
	129	*/
44d3bd01 DG	130	struct ltt_ust_channel trace_ust_create_channel(struct lttng_channel chan,
44d3bd01 DG	131	char *path)
97ee3a89 DG	132	{
	133	int ret;
	134	struct ltt_ust_channel *luc;
	135
	136	luc = malloc(sizeof(struct ltt_ust_channel));
	137	if (luc == NULL) {
	138	perror("ltt_ust_channel malloc");
	139	goto error;
	140	}
	141
44d3bd01	142	/* Copy UST channel attributes */
48842b30 DG	143	luc->attr.overwrite = chan->attr.overwrite;
	144	luc->attr.subbuf_size = chan->attr.subbuf_size;
	145	luc->attr.num_subbuf = chan->attr.num_subbuf;
	146	luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
	147	luc->attr.read_timer_interval = chan->attr.read_timer_interval;
	148	luc->attr.output = chan->attr.output;
44d3bd01 DG	149
	150	/* Translate to UST output enum */
	151	switch (luc->attr.output) {
	152	default:
	153	luc->attr.output = LTTNG_UST_MMAP;
	154	break;
97ee3a89	155	}
97ee3a89	156
97ee3a89	157	/* Copy channel name */
44d3bd01	158	strncpy(luc->name, chan->name, sizeof(&luc->name));
97ee3a89 DG	159	luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89 DG	160
f6a9efaa DG	161	/* Init node */
	162	hashtable_node_init(&luc->node, (void *) luc->name, strlen(luc->name));
	163	/* Alloc hash tables */
	164	luc->events = hashtable_new_str(0);
	165	luc->ctx = hashtable_new_str(0);
	166
97ee3a89	167	/* Set trace output path */
48842b30	168	ret = snprintf(luc->pathname, PATH_MAX, "%s", path);
97ee3a89 DG	169	if (ret < 0) {
	170	perror("asprintf ust create channel");
	171	goto error;
	172	}
	173
f6a9efaa DG	174	DBG2("Trace UST channel %s created", luc->name);
f6a9efaa DG	175
97ee3a89 DG	176	return luc;
	177
	178	error:
	179	return NULL;
	180	}
	181
	182	/*
	183	* Allocate and initialize a ust event. Set name and event type.
	184	*
	185	* Return pointer to structure or NULL.
	186	*/
	187	struct ltt_ust_event trace_ust_create_event(struct lttng_event ev)
	188	{
	189	struct ltt_ust_event *lue;
97ee3a89 DG	190
97ee3a89 DG	191	lue = malloc(sizeof(struct ltt_ust_event));
44d3bd01 DG	192	if (lue == NULL) {
44d3bd01 DG	193	PERROR("ust event malloc");
97ee3a89 DG	194	goto error;
	195	}
	196
	197	switch (ev->type) {
	198	case LTTNG_EVENT_PROBE:
44d3bd01	199	lue->attr.instrumentation = LTTNG_UST_PROBE;
97ee3a89 DG	200	break;
97ee3a89 DG	201	case LTTNG_EVENT_FUNCTION:
44d3bd01	202	lue->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89 DG	203	break;
97ee3a89 DG	204	case LTTNG_EVENT_FUNCTION_ENTRY:
44d3bd01	205	lue->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89 DG	206	break;
97ee3a89 DG	207	case LTTNG_EVENT_TRACEPOINT:
44d3bd01	208	lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
97ee3a89 DG	209	break;
	210	default:
	211	ERR("Unknown ust instrumentation type (%d)", ev->type);
	212	goto error;
	213	}
	214
	215	/* Copy event name */
44d3bd01 DG	216	strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
44d3bd01 DG	217	lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89	218
f6a9efaa DG	219	/* Init node */
	220	hashtable_node_init(&lue->node, (void *) lue->attr.name,
	221	strlen(lue->attr.name));
	222	/* Alloc context hash tables */
	223	lue->ctx = hashtable_new_str(5);
97ee3a89 DG	224
	225	return lue;
	226
	227	error:
	228	return NULL;
	229	}
	230
	231	/*
	232	* Allocate and initialize a ust metadata.
	233	*
	234	* Return pointer to structure or NULL.
	235	*/
	236	struct ltt_ust_metadata trace_ust_create_metadata(char path)
	237	{
	238	int ret;
	239	struct ltt_ust_metadata *lum;
97ee3a89 DG	240
97ee3a89 DG	241	lum = malloc(sizeof(struct ltt_ust_metadata));
44d3bd01	242	if (lum == NULL) {
97ee3a89 DG	243	perror("ust metadata malloc");
	244	goto error;
	245	}
	246
	247	/* Set default attributes */
44d3bd01 DG	248	lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
	249	lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
	250	lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
	251	lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
	252	lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
	253	lum->attr.output = DEFAULT_UST_CHANNEL_OUTPUT;
	254
97ee3a89 DG	255	lum->handle = -1;
97ee3a89 DG	256	/* Set metadata trace path */
f6a9efaa	257	ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path);
97ee3a89 DG	258	if (ret < 0) {
	259	perror("asprintf ust metadata");
	260	goto error;
	261	}
	262
	263	return lum;
	264
	265	error:
	266	return NULL;
	267	}
	268
f6a9efaa DG	269	/*
	270	* RCU safe free context structure.
	271	*/
	272	static void destroy_context_rcu(struct rcu_head *head)
	273	{
	274	struct cds_lfht_node *node =
	275	caa_container_of(head, struct cds_lfht_node, head);
	276	struct ltt_ust_context *ctx =
	277	caa_container_of(node, struct ltt_ust_context, node);
	278
	279	free(ctx);
	280	}
	281
	282	/*
	283	* Cleanup UST context hash table.
	284	*/
	285	static void destroy_context(struct cds_lfht *ht)
	286	{
	287	int ret;
	288	struct cds_lfht_node *node;
	289	struct cds_lfht_iter iter;
	290
	291	hashtable_get_first(ht, &iter);
	292	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
	293	ret = hashtable_del(ht, &iter);
	294	if (!ret) {
	295	call_rcu(&node->head, destroy_context_rcu);
	296	}
	297	hashtable_get_next(ht, &iter);
	298	}
	299	}
	300
97ee3a89 DG	301	/*
	302	* Cleanup ust event structure.
	303	*/
	304	void trace_ust_destroy_event(struct ltt_ust_event *event)
	305	{
f6a9efaa DG	306	DBG2("Trace destroy UST event %s", event->attr.name);
f6a9efaa DG	307	destroy_context(event->ctx);
97ee3a89 DG	308	free(event);
	309	}
	310
f6a9efaa DG	311	/*
	312	* URCU intermediate call to complete destroy event.
	313	*/
	314	static void destroy_event_rcu(struct rcu_head *head)
	315	{
	316	struct cds_lfht_node *node =
	317	caa_container_of(head, struct cds_lfht_node, head);
	318	struct ltt_ust_event *event =
	319	caa_container_of(node, struct ltt_ust_event, node);
	320
	321	trace_ust_destroy_event(event);
	322	}
	323
97ee3a89 DG	324	/*
	325	* Cleanup ust channel structure.
	326	*/
	327	void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
	328	{
f6a9efaa DG	329	int ret;
	330	struct cds_lfht_node *node;
	331	struct cds_lfht_iter iter;
97ee3a89	332
f6a9efaa	333	DBG2("Trace destroy UST channel %s", channel->name);
97ee3a89	334
f6a9efaa DG	335	rcu_read_lock();
	336
	337	hashtable_get_first(channel->events, &iter);
	338	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
	339	ret = hashtable_del(channel->events, &iter);
	340	if (!ret) {
	341	call_rcu(&node->head, destroy_event_rcu);
	342	}
	343	hashtable_get_next(channel->events, &iter);
97ee3a89 DG	344	}
97ee3a89 DG	345
f6a9efaa DG	346	free(channel->events);
f6a9efaa DG	347	destroy_context(channel->ctx);
97ee3a89	348	free(channel);
f6a9efaa DG	349
	350	rcu_read_unlock();
	351	}
	352
	353	/*
	354	* URCU intermediate call to complete destroy channel.
	355	*/
	356	static void destroy_channel_rcu(struct rcu_head *head)
	357	{
	358	struct cds_lfht_node *node =
	359	caa_container_of(head, struct cds_lfht_node, head);
	360	struct ltt_ust_channel *channel =
	361	caa_container_of(node, struct ltt_ust_channel, node);
	362
	363	trace_ust_destroy_channel(channel);
97ee3a89 DG	364	}
	365
	366	/*
	367	* Cleanup ust metadata structure.
	368	*/
	369	void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
	370	{
f6a9efaa	371	DBG2("Trace UST destroy metadata %d", metadata->handle);
97ee3a89	372
97ee3a89 DG	373	free(metadata);
	374	}
	375
	376	/*
f6a9efaa	377	* Iterate over a hash table containing channels and cleanup safely.
97ee3a89	378	*/
f6a9efaa DG	379	static void destroy_channels(struct cds_lfht *channels)
	380	{
	381	int ret;
	382	struct cds_lfht_node *node;
	383	struct cds_lfht_iter iter;
	384
	385	hashtable_get_first(channels, &iter);
	386	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
	387	ret = hashtable_del(channels, &iter);
	388	if (!ret) {
	389	call_rcu(&node->head, destroy_channel_rcu);
	390	}
	391	hashtable_get_next(channels, &iter);
	392	}
	393	}
	394
	395	/*
	396	* Cleanup UST pid domain.
	397	*/
	398	static void destroy_domain_pid(struct cds_lfht *ht)
	399	{
	400	int ret;
	401	struct cds_lfht_node *node;
	402	struct cds_lfht_iter iter;
	403	struct ltt_ust_domain_pid *d;
	404
	405	hashtable_get_first(ht, &iter);
	406	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
	407	ret = hashtable_del(ht , &iter);
	408	if (!ret) {
	409	d = caa_container_of(node, struct ltt_ust_domain_pid, node);
	410	destroy_channels(d->channels);
	411	}
	412	hashtable_get_next(ht, &iter);
	413	}
	414	}
	415
	416	/*
	417	* Cleanup UST exec name domain.
	418	*/
	419	static void destroy_domain_exec(struct cds_lfht *ht)
97ee3a89	420	{
f6a9efaa DG	421	int ret;
	422	struct cds_lfht_node *node;
	423	struct cds_lfht_iter iter;
	424	struct ltt_ust_domain_exec *d;
	425
	426	hashtable_get_first(ht, &iter);
	427	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
	428	ret = hashtable_del(ht , &iter);
	429	if (!ret) {
	430	d = caa_container_of(node, struct ltt_ust_domain_exec, node);
	431	destroy_channels(d->channels);
	432	}
	433	hashtable_get_next(ht, &iter);
	434	}
	435	}
97ee3a89	436
f6a9efaa DG	437	/*
	438	* Cleanup UST global domain.
	439	*/
	440	static void destroy_domain_global(struct ltt_ust_domain_global *dom)
	441	{
	442	destroy_channels(dom->channels);
	443	}
97ee3a89	444
f6a9efaa DG	445	/*
	446	* Cleanup ust session structure
	447	*/
	448	void trace_ust_destroy_session(struct ltt_ust_session *session)
	449	{
97ee3a89 DG	450	/* Extra safety */
	451	if (session == NULL) {
	452	return;
	453	}
	454
f6a9efaa DG	455	rcu_read_lock();
f6a9efaa DG	456
48842b30	457	DBG2("Trace UST destroy session %d", session->uid);
f6a9efaa	458
48842b30 DG	459	//if (session->metadata != NULL) {
	460	// trace_ust_destroy_metadata(session->metadata);
	461	//}
97ee3a89	462
f6a9efaa DG	463	/* Cleaning up UST domain */
	464	destroy_domain_global(&session->domain_global);
	465	destroy_domain_pid(session->domain_pid);
	466	destroy_domain_exec(session->domain_exec);
44d3bd01	467
97ee3a89	468	free(session);
f6a9efaa DG	469
f6a9efaa DG	470	rcu_read_unlock();
97ee3a89	471	}