[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;
	lus->start_trace = 0;

	/* 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(0);

	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 = LTTNG_UST_MMAP;

	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) {
36dc12cc	95	PERROR("create ust session malloc");
97ee3a89 DG	96	goto error;
	97	}
	98
	99	/* Init data structure */
3bd1e081	100	lus->consumer_fds_sent = 0;
48842b30	101	lus->uid = uid;
36dc12cc	102	lus->start_trace = 0;
97ee3a89	103
f6a9efaa DG	104	/* Alloc UST domain hash tables */
	105	lus->domain_pid = hashtable_new(0);
	106	lus->domain_exec = hashtable_new_str(0);
	107
	108	/* Alloc UST global domain channels' HT */
	109	lus->domain_global.channels = hashtable_new_str(0);
44d3bd01	110
0177d773	111	/* Set session path */
48842b30	112	ret = snprintf(lus->pathname, PATH_MAX, "%s/ust", path);
0177d773	113	if (ret < 0) {
44d3bd01	114	PERROR("snprintf kernel traces path");
0177d773 DG	115	goto error;
	116	}
	117
44d3bd01 DG	118	DBG2("UST trace session create successful");
44d3bd01 DG	119
97ee3a89 DG	120	return lus;
	121
	122	error:
	123	return NULL;
	124	}
	125
	126	/*
	127	* Allocate and initialize a ust channel data structure.
	128	*
	129	* Return pointer to structure or NULL.
	130	*/
44d3bd01 DG	131	struct ltt_ust_channel trace_ust_create_channel(struct lttng_channel chan,
44d3bd01 DG	132	char *path)
97ee3a89 DG	133	{
	134	int ret;
	135	struct ltt_ust_channel *luc;
	136
	137	luc = malloc(sizeof(struct ltt_ust_channel));
	138	if (luc == NULL) {
	139	perror("ltt_ust_channel malloc");
	140	goto error;
	141	}
	142
44d3bd01	143	/* Copy UST channel attributes */
48842b30 DG	144	luc->attr.overwrite = chan->attr.overwrite;
	145	luc->attr.subbuf_size = chan->attr.subbuf_size;
	146	luc->attr.num_subbuf = chan->attr.num_subbuf;
	147	luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
	148	luc->attr.read_timer_interval = chan->attr.read_timer_interval;
	149	luc->attr.output = chan->attr.output;
44d3bd01 DG	150
	151	/* Translate to UST output enum */
	152	switch (luc->attr.output) {
	153	default:
	154	luc->attr.output = LTTNG_UST_MMAP;
	155	break;
97ee3a89	156	}
97ee3a89	157
97ee3a89	158	/* Copy channel name */
44d3bd01	159	strncpy(luc->name, chan->name, sizeof(&luc->name));
97ee3a89 DG	160	luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89 DG	161
f6a9efaa DG	162	/* Init node */
	163	hashtable_node_init(&luc->node, (void *) luc->name, strlen(luc->name));
	164	/* Alloc hash tables */
	165	luc->events = hashtable_new_str(0);
	166	luc->ctx = hashtable_new_str(0);
	167
97ee3a89	168	/* Set trace output path */
48842b30	169	ret = snprintf(luc->pathname, PATH_MAX, "%s", path);
97ee3a89 DG	170	if (ret < 0) {
	171	perror("asprintf ust create channel");
	172	goto error;
	173	}
	174
f6a9efaa DG	175	DBG2("Trace UST channel %s created", luc->name);
f6a9efaa DG	176
97ee3a89 DG	177	return luc;
	178
	179	error:
	180	return NULL;
	181	}
	182
	183	/*
	184	* Allocate and initialize a ust event. Set name and event type.
	185	*
	186	* Return pointer to structure or NULL.
	187	*/
	188	struct ltt_ust_event trace_ust_create_event(struct lttng_event ev)
	189	{
	190	struct ltt_ust_event *lue;
97ee3a89 DG	191
97ee3a89 DG	192	lue = malloc(sizeof(struct ltt_ust_event));
44d3bd01 DG	193	if (lue == NULL) {
44d3bd01 DG	194	PERROR("ust event malloc");
97ee3a89 DG	195	goto error;
	196	}
	197
	198	switch (ev->type) {
	199	case LTTNG_EVENT_PROBE:
44d3bd01	200	lue->attr.instrumentation = LTTNG_UST_PROBE;
97ee3a89 DG	201	break;
97ee3a89 DG	202	case LTTNG_EVENT_FUNCTION:
44d3bd01	203	lue->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89 DG	204	break;
97ee3a89 DG	205	case LTTNG_EVENT_FUNCTION_ENTRY:
44d3bd01	206	lue->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89 DG	207	break;
97ee3a89 DG	208	case LTTNG_EVENT_TRACEPOINT:
44d3bd01	209	lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
97ee3a89 DG	210	break;
	211	default:
	212	ERR("Unknown ust instrumentation type (%d)", ev->type);
	213	goto error;
	214	}
	215
	216	/* Copy event name */
44d3bd01 DG	217	strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
44d3bd01 DG	218	lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89	219
f6a9efaa DG	220	/* Init node */
	221	hashtable_node_init(&lue->node, (void *) lue->attr.name,
	222	strlen(lue->attr.name));
	223	/* Alloc context hash tables */
e03e3332	224	lue->ctx = hashtable_new_str(0);
97ee3a89 DG	225
	226	return lue;
	227
	228	error:
	229	return NULL;
	230	}
	231
	232	/*
	233	* Allocate and initialize a ust metadata.
	234	*
	235	* Return pointer to structure or NULL.
	236	*/
	237	struct ltt_ust_metadata trace_ust_create_metadata(char path)
	238	{
	239	int ret;
	240	struct ltt_ust_metadata *lum;
97ee3a89 DG	241
97ee3a89 DG	242	lum = malloc(sizeof(struct ltt_ust_metadata));
44d3bd01	243	if (lum == NULL) {
97ee3a89 DG	244	perror("ust metadata malloc");
	245	goto error;
	246	}
	247
	248	/* Set default attributes */
44d3bd01 DG	249	lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
	250	lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
	251	lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
	252	lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
	253	lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
d41f73b7	254	lum->attr.output = LTTNG_UST_MMAP;
44d3bd01	255
97ee3a89 DG	256	lum->handle = -1;
97ee3a89 DG	257	/* Set metadata trace path */
f6a9efaa	258	ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path);
97ee3a89 DG	259	if (ret < 0) {
	260	perror("asprintf ust metadata");
	261	goto error;
	262	}
	263
	264	return lum;
	265
	266	error:
	267	return NULL;
	268	}
	269
f6a9efaa DG	270	/*
	271	* RCU safe free context structure.
	272	*/
	273	static void destroy_context_rcu(struct rcu_head *head)
	274	{
	275	struct cds_lfht_node *node =
	276	caa_container_of(head, struct cds_lfht_node, head);
	277	struct ltt_ust_context *ctx =
	278	caa_container_of(node, struct ltt_ust_context, node);
	279
	280	free(ctx);
	281	}
	282
	283	/*
	284	* Cleanup UST context hash table.
	285	*/
	286	static void destroy_context(struct cds_lfht *ht)
	287	{
	288	int ret;
	289	struct cds_lfht_node *node;
	290	struct cds_lfht_iter iter;
	291
	292	hashtable_get_first(ht, &iter);
	293	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
	294	ret = hashtable_del(ht, &iter);
	295	if (!ret) {
	296	call_rcu(&node->head, destroy_context_rcu);
	297	}
	298	hashtable_get_next(ht, &iter);
	299	}
	300	}
	301
97ee3a89 DG	302	/*
	303	* Cleanup ust event structure.
	304	*/
	305	void trace_ust_destroy_event(struct ltt_ust_event *event)
	306	{
f6a9efaa DG	307	DBG2("Trace destroy UST event %s", event->attr.name);
f6a9efaa DG	308	destroy_context(event->ctx);
97ee3a89 DG	309	free(event);
	310	}
	311
f6a9efaa DG	312	/*
	313	* URCU intermediate call to complete destroy event.
	314	*/
	315	static void destroy_event_rcu(struct rcu_head *head)
	316	{
	317	struct cds_lfht_node *node =
	318	caa_container_of(head, struct cds_lfht_node, head);
	319	struct ltt_ust_event *event =
	320	caa_container_of(node, struct ltt_ust_event, node);
	321
	322	trace_ust_destroy_event(event);
	323	}
	324
97ee3a89 DG	325	/*
	326	* Cleanup ust channel structure.
	327	*/
	328	void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
	329	{
f6a9efaa DG	330	int ret;
	331	struct cds_lfht_node *node;
	332	struct cds_lfht_iter iter;
97ee3a89	333
f6a9efaa	334	DBG2("Trace destroy UST channel %s", channel->name);
97ee3a89	335
f6a9efaa DG	336	rcu_read_lock();
	337
	338	hashtable_get_first(channel->events, &iter);
	339	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
	340	ret = hashtable_del(channel->events, &iter);
	341	if (!ret) {
	342	call_rcu(&node->head, destroy_event_rcu);
	343	}
	344	hashtable_get_next(channel->events, &iter);
97ee3a89 DG	345	}
97ee3a89 DG	346
f6a9efaa DG	347	free(channel->events);
f6a9efaa DG	348	destroy_context(channel->ctx);
97ee3a89	349	free(channel);
f6a9efaa DG	350
	351	rcu_read_unlock();
	352	}
	353
	354	/*
	355	* URCU intermediate call to complete destroy channel.
	356	*/
	357	static void destroy_channel_rcu(struct rcu_head *head)
	358	{
	359	struct cds_lfht_node *node =
	360	caa_container_of(head, struct cds_lfht_node, head);
	361	struct ltt_ust_channel *channel =
	362	caa_container_of(node, struct ltt_ust_channel, node);
	363
	364	trace_ust_destroy_channel(channel);
97ee3a89 DG	365	}
	366
	367	/*
	368	* Cleanup ust metadata structure.
	369	*/
	370	void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
	371	{
f6a9efaa	372	DBG2("Trace UST destroy metadata %d", metadata->handle);
97ee3a89	373
97ee3a89 DG	374	free(metadata);
	375	}
	376
	377	/*
f6a9efaa	378	* Iterate over a hash table containing channels and cleanup safely.
97ee3a89	379	*/
f6a9efaa DG	380	static void destroy_channels(struct cds_lfht *channels)
	381	{
	382	int ret;
	383	struct cds_lfht_node *node;
	384	struct cds_lfht_iter iter;
	385
	386	hashtable_get_first(channels, &iter);
	387	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
	388	ret = hashtable_del(channels, &iter);
	389	if (!ret) {
	390	call_rcu(&node->head, destroy_channel_rcu);
	391	}
	392	hashtable_get_next(channels, &iter);
	393	}
	394	}
	395
	396	/*
	397	* Cleanup UST pid domain.
	398	*/
	399	static void destroy_domain_pid(struct cds_lfht *ht)
	400	{
	401	int ret;
	402	struct cds_lfht_node *node;
	403	struct cds_lfht_iter iter;
	404	struct ltt_ust_domain_pid *d;
	405
	406	hashtable_get_first(ht, &iter);
	407	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
	408	ret = hashtable_del(ht , &iter);
	409	if (!ret) {
	410	d = caa_container_of(node, struct ltt_ust_domain_pid, node);
	411	destroy_channels(d->channels);
	412	}
	413	hashtable_get_next(ht, &iter);
	414	}
	415	}
	416
	417	/*
	418	* Cleanup UST exec name domain.
	419	*/
	420	static void destroy_domain_exec(struct cds_lfht *ht)
97ee3a89	421	{
f6a9efaa DG	422	int ret;
	423	struct cds_lfht_node *node;
	424	struct cds_lfht_iter iter;
	425	struct ltt_ust_domain_exec *d;
	426
	427	hashtable_get_first(ht, &iter);
	428	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
	429	ret = hashtable_del(ht , &iter);
	430	if (!ret) {
	431	d = caa_container_of(node, struct ltt_ust_domain_exec, node);
	432	destroy_channels(d->channels);
	433	}
	434	hashtable_get_next(ht, &iter);
	435	}
	436	}
97ee3a89	437
f6a9efaa DG	438	/*
	439	* Cleanup UST global domain.
	440	*/
	441	static void destroy_domain_global(struct ltt_ust_domain_global *dom)
	442	{
	443	destroy_channels(dom->channels);
	444	}
97ee3a89	445
f6a9efaa DG	446	/*
	447	* Cleanup ust session structure
	448	*/
	449	void trace_ust_destroy_session(struct ltt_ust_session *session)
	450	{
97ee3a89 DG	451	/* Extra safety */
	452	if (session == NULL) {
	453	return;
	454	}
	455
f6a9efaa DG	456	rcu_read_lock();
f6a9efaa DG	457
48842b30	458	DBG2("Trace UST destroy session %d", session->uid);
f6a9efaa	459
48842b30 DG	460	//if (session->metadata != NULL) {
	461	// trace_ust_destroy_metadata(session->metadata);
	462	//}
97ee3a89	463
f6a9efaa DG	464	/* Cleaning up UST domain */
	465	destroy_domain_global(&session->domain_global);
	466	destroy_domain_pid(session->domain_pid);
	467	destroy_domain_exec(session->domain_exec);
44d3bd01	468
97ee3a89	469	free(session);
f6a9efaa DG	470
f6a9efaa DG	471	rcu_read_unlock();
97ee3a89	472	}