[lttng-ust.git] / liblttng-ust / ltt-probes.c

/*
 * ltt-probes.c
 *
 * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Holds LTTng probes registry.
 *
 * Dual LGPL v2.1/GPL v2 license.
 */

#include <string.h>
#include <errno.h>
#include <urcu/list.h>
#include <urcu/hlist.h>
#include <lttng/ust-events.h>
#include <assert.h>
#include <helper.h>
#include <ctype.h>

#include "tracepoint-internal.h"
#include "ltt-tracer-core.h"
#include "jhash.h"
#include "error.h"

/*
 * probe list is protected by ust_lock()/ust_unlock().
 */
static CDS_LIST_HEAD(probe_list);

/*
 * Wildcard list, containing the active wildcards.
 * Protected by ust lock.
 */
static CDS_LIST_HEAD(wildcard_list);

static
const struct lttng_probe_desc *find_provider(const char *provider)
{
	struct lttng_probe_desc *iter;

	cds_list_for_each_entry(iter, &probe_list, head) {
		if (!strcmp(iter->provider, provider))
			return iter;
	}
	return NULL;
}

static
const struct lttng_event_desc *find_event(const char *name)
{
	struct lttng_probe_desc *probe_desc;
	int i;

	cds_list_for_each_entry(probe_desc, &probe_list, head) {
		for (i = 0; i < probe_desc->nr_events; i++) {
			if (!strncmp(probe_desc->event_desc[i]->name, name,
					LTTNG_UST_SYM_NAME_LEN - 1))
				return probe_desc->event_desc[i];
		}
	}
	return NULL;
}

int ltt_probe_register(struct lttng_probe_desc *desc)
{
	struct lttng_probe_desc *iter;
	int ret = 0;
	int i;

	ust_lock();
	if (find_provider(desc->provider)) {
		ret = -EEXIST;
		goto end;
	}
	/*
	 * TODO: This is O(N^2). Turn into a hash table when probe registration
	 * overhead becomes an issue.
	 */
	for (i = 0; i < desc->nr_events; i++) {
		if (find_event(desc->event_desc[i]->name)) {
			ret = -EEXIST;
			goto end;
		}
	}

	/*
	 * We sort the providers by struct lttng_probe_desc pointer
	 * address.
	 */
	cds_list_for_each_entry_reverse(iter, &probe_list, head) {
		BUG_ON(iter == desc); /* Should never be in the list twice */
		if (iter < desc) {
			/* We belong to the location right after iter. */
			cds_list_add(&desc->head, &iter->head);
			goto desc_added;
		}
	}
	/* We should be added at the head of the list */
	cds_list_add(&desc->head, &probe_list);
desc_added:
	DBG("just registered probe %s containing %u events",
		desc->provider, desc->nr_events);
	/*
	 * fix the events awaiting probe load.
	 */
	for (i = 0; i < desc->nr_events; i++) {
		ret = pending_probe_fix_events(desc->event_desc[i]);
		assert(!ret);
	}
end:
	ust_unlock();
	return ret;
}

void ltt_probe_unregister(struct lttng_probe_desc *desc)
{
	ust_lock();
	cds_list_del(&desc->head);
	DBG("just unregistered probe %s", desc->provider);
	ust_unlock();
}

/*
 * called with UST lock held.
 */
const struct lttng_event_desc *ltt_event_get(const char *name)
{
	const struct lttng_event_desc *event;

	event = find_event(name);
	if (!event)
		return NULL;
	return event;
}

void ltt_event_put(const struct lttng_event_desc *event)
{
}

void ltt_probes_prune_event_list(struct lttng_ust_tracepoint_list *list)
{
	struct tp_list_entry *list_entry, *tmp;

	cds_list_for_each_entry_safe(list_entry, tmp, &list->head, head) {
		cds_list_del(&list_entry->head);
		free(list_entry);
	}
}

/*
 * called with UST lock held.
 */
int ltt_probes_get_event_list(struct lttng_ust_tracepoint_list *list)
{
	struct lttng_probe_desc *probe_desc;
	int i;

	CDS_INIT_LIST_HEAD(&list->head);
	cds_list_for_each_entry(probe_desc, &probe_list, head) {
		for (i = 0; i < probe_desc->nr_events; i++) {
			struct tp_list_entry *list_entry;

			list_entry = zmalloc(sizeof(*list_entry));
			if (!list_entry)
				goto err_nomem;
			cds_list_add(&list_entry->head, &list->head);
			strncpy(list_entry->tp.name,
				probe_desc->event_desc[i]->name,
				LTTNG_UST_SYM_NAME_LEN);
			list_entry->tp.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
			if (!probe_desc->event_desc[i]->loglevel) {
				list_entry->tp.loglevel = TRACE_DEFAULT;
			} else {
				list_entry->tp.loglevel = *(*probe_desc->event_desc[i]->loglevel);
			}
		}
	}
	if (cds_list_empty(&list->head))
		list->iter = NULL;
	else
		list->iter =
			cds_list_first_entry(&list->head, struct tp_list_entry, head);
	return 0;

err_nomem:
	ltt_probes_prune_event_list(list);
	return -ENOMEM;
}

/*
 * Return current iteration position, advance internal iterator to next.
 * Return NULL if end of list.
 */
struct lttng_ust_tracepoint_iter *
	lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list)
{
	struct tp_list_entry *entry;

	if (!list->iter)
		return NULL;
	entry = list->iter;
	if (entry->head.next == &list->head)
		list->iter = NULL;
	else
		list->iter = cds_list_entry(entry->head.next,
				struct tp_list_entry, head);
	return &entry->tp;
}

/* WILDCARDS */

/*
 * Return wildcard for a given event name if the event name match the
 * one of the wildcards.
 * Must be called with ust lock held.
 * Returns NULL if not present.
 */
struct wildcard_entry *match_wildcard(const char *name)
{
	struct wildcard_entry *e;

	cds_list_for_each_entry(e, &wildcard_list, list) {
		/* If only contain '*' */
		if (strlen(e->name) == 1)
			return e;
		/* Compare excluding final '*' */
		if (!strncmp(name, e->name, strlen(e->name) - 1))
			return e;
	}
	return NULL;
}

/*
 * marshall all probes/all events and create those that fit the
 * wildcard. Add them to the events list as created.
 */
static
void _probes_create_wildcard_events(struct wildcard_entry *entry,
				struct session_wildcard *wildcard)
{
	struct lttng_probe_desc *probe_desc;
	struct lttng_ust_event event_param;
	int i;

	cds_list_for_each_entry(probe_desc, &probe_list, head) {
		for (i = 0; i < probe_desc->nr_events; i++) {
			const struct lttng_event_desc *event_desc;
			int match = 0;

			event_desc = probe_desc->event_desc[i];
			/* compare excluding final '*' */
			assert(strlen(entry->name) > 0);
			if (strcmp(event_desc->name, "lttng_ust:metadata")
					&& (strlen(entry->name) == 1
						|| !strncmp(event_desc->name, entry->name,
							strlen(entry->name) - 1))) {
				/* TODO: check if loglevel match */
				//if (event_desc->loglevel
				//	&& (*event_desc->loglevel) ...)
				match = 1;
			}
			if (match) {
				struct ltt_event *ev;
				int ret;

				memcpy(&event_param, &wildcard->event_param,
						sizeof(event_param));
				memcpy(event_param.name,
					event_desc->name,
					sizeof(event_param.name));
				/* create event */
				ret = ltt_event_create(wildcard->chan,
					&event_param, NULL,
					&ev);
				if (ret) {
					DBG("Error creating event");
					continue;
				}
				cds_list_add(&ev->wildcard_list,
					&wildcard->events);
			}
		}
	}
}

/*
 * Add the wildcard to the wildcard list. Must be called with
 * ust lock held.
 */
struct session_wildcard *add_wildcard(const char *name,
	struct ltt_channel *chan,
	struct lttng_ust_event *event_param)
{
	struct wildcard_entry *e;
	struct session_wildcard *sw;
	size_t name_len = strlen(name) + 1;
	int found = 0;

	/* try to find global wildcard entry */
	cds_list_for_each_entry(e, &wildcard_list, list) {
		if (!strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) {
			found = 1;
			break;
		}
	}

	if (!found) {
		/*
		 * Create global wildcard entry if not found. Using
		 * zmalloc here to allocate a variable length element.
		 * Could cause some memory fragmentation if overused.
		 */
		e = zmalloc(sizeof(struct wildcard_entry) + name_len);
		if (!e)
			return ERR_PTR(-ENOMEM);
		memcpy(&e->name[0], name, name_len);
		cds_list_add(&e->list, &wildcard_list);
		CDS_INIT_LIST_HEAD(&e->session_list);
	}

	/* session wildcard */
	cds_list_for_each_entry(sw, &e->session_list, session_list) {
		if (chan == sw->chan) {
			DBG("wildcard %s busy for this channel", name);
			return ERR_PTR(-EEXIST);	/* Already there */
		}
	}
	sw = zmalloc(sizeof(struct session_wildcard));
	if (!sw)
		return ERR_PTR(-ENOMEM);
	sw->chan = chan;
	sw->enabled = 1;
	memcpy(&sw->event_param, event_param, sizeof(sw->event_param));
	sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT;
	CDS_INIT_LIST_HEAD(&sw->events);
	cds_list_add(&sw->list, &chan->session->wildcards);
	cds_list_add(&sw->session_list, &e->session_list);
	sw->entry = e;
	_probes_create_wildcard_events(e, sw);
	return sw;
}

/*
 * Remove the wildcard from the wildcard list. Must be called with
 * ust_lock held. Only called at session teardown.
 */
void _remove_wildcard(struct session_wildcard *wildcard)
{
	struct ltt_event *ev, *tmp;

	/*
	 * Just remove the events owned (for enable/disable) by this
	 * wildcard from the list. The session teardown will take care
	 * of freeing the event memory.
	 */
	cds_list_for_each_entry_safe(ev, tmp, &wildcard->events,
			wildcard_list) {
		cds_list_del(&ev->wildcard_list);
	}
	cds_list_del(&wildcard->session_list);
	cds_list_del(&wildcard->list);
	if (cds_list_empty(&wildcard->entry->session_list)) {
		cds_list_del(&wildcard->entry->list);
		free(wildcard->entry);
	}
	free(wildcard);
}

int ltt_wildcard_enable(struct session_wildcard *wildcard)
{
	struct ltt_event *ev;
	int ret;

	if (wildcard->enabled)
		return -EEXIST;
	cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) {
		ret = ltt_event_enable(ev);
		if (ret) {
			DBG("Error: enable error.\n");
			return ret;
		}
	}
	wildcard->enabled = 1;
	return 0;
}

int ltt_wildcard_disable(struct session_wildcard *wildcard)
{
	struct ltt_event *ev;
	int ret;

	if (!wildcard->enabled)
		return -EEXIST;
	cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) {
		ret = ltt_event_disable(ev);
		if (ret) {
			DBG("Error: disable error.\n");
			return ret;
		}
	}
	wildcard->enabled = 0;
	return 0;
}
Commit	Line	Data
ce5aef0b MD	1	/*
	2	* ltt-probes.c
	3	*
	4	* Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	5	*
	6	* Holds LTTng probes registry.
	7	*
	8	* Dual LGPL v2.1/GPL v2 license.
	9	*/
	10
8d8a24c8 MD	11	#include <string.h>
	12	#include <errno.h>
	13	#include <urcu/list.h>
1f18504e	14	#include <urcu/hlist.h>
4318ae1b	15	#include <lttng/ust-events.h>
a3bb4b27	16	#include <assert.h>
c8fcf224	17	#include <helper.h>
48740cab	18	#include <ctype.h>
ce5aef0b	19
882a56d7	20	#include "tracepoint-internal.h"
8165c8da	21	#include "ltt-tracer-core.h"
1f18504e MD	22	#include "jhash.h"
1f18504e MD	23	#include "error.h"
8165c8da MD	24
8165c8da MD	25	/*
17dfb34b	26	* probe list is protected by ust_lock()/ust_unlock().
8165c8da	27	*/
8d8a24c8	28	static CDS_LIST_HEAD(probe_list);
ce5aef0b	29
e6c12e3d MD	30	/*
	31	* Wildcard list, containing the active wildcards.
	32	* Protected by ust lock.
	33	*/
	34	static CDS_LIST_HEAD(wildcard_list);
	35
df854e41 MD	36	static
	37	const struct lttng_probe_desc find_provider(const char provider)
	38	{
	39	struct lttng_probe_desc *iter;
	40
	41	cds_list_for_each_entry(iter, &probe_list, head) {
	42	if (!strcmp(iter->provider, provider))
	43	return iter;
	44	}
	45	return NULL;
	46	}
	47
ce5aef0b MD	48	static
	49	const struct lttng_event_desc find_event(const char name)
	50	{
	51	struct lttng_probe_desc *probe_desc;
	52	int i;
	53
8d8a24c8	54	cds_list_for_each_entry(probe_desc, &probe_list, head) {
ce5aef0b	55	for (i = 0; i < probe_desc->nr_events; i++) {
ff412fb5 MD	56	if (!strncmp(probe_desc->event_desc[i]->name, name,
ff412fb5 MD	57	LTTNG_UST_SYM_NAME_LEN - 1))
df854e41	58	return probe_desc->event_desc[i];
ce5aef0b MD	59	}
	60	}
	61	return NULL;
	62	}
	63
	64	int ltt_probe_register(struct lttng_probe_desc *desc)
	65	{
df854e41	66	struct lttng_probe_desc *iter;
ce5aef0b MD	67	int ret = 0;
	68	int i;
	69
17dfb34b	70	ust_lock();
df854e41 MD	71	if (find_provider(desc->provider)) {
	72	ret = -EEXIST;
	73	goto end;
	74	}
ce5aef0b MD	75	/*
	76	* TODO: This is O(N^2). Turn into a hash table when probe registration
	77	* overhead becomes an issue.
	78	*/
	79	for (i = 0; i < desc->nr_events; i++) {
df854e41	80	if (find_event(desc->event_desc[i]->name)) {
ce5aef0b MD	81	ret = -EEXIST;
	82	goto end;
	83	}
	84	}
df854e41 MD	85
	86	/*
	87	* We sort the providers by struct lttng_probe_desc pointer
	88	* address.
	89	*/
	90	cds_list_for_each_entry_reverse(iter, &probe_list, head) {
	91	BUG_ON(iter == desc); /* Should never be in the list twice */
	92	if (iter < desc) {
	93	/* We belong to the location right after iter. */
	94	cds_list_add(&desc->head, &iter->head);
	95	goto desc_added;
	96	}
	97	}
	98	/* We should be added at the head of the list */
8d8a24c8	99	cds_list_add(&desc->head, &probe_list);
df854e41	100	desc_added:
e81a53af MD	101	DBG("just registered probe %s containing %u events",
e81a53af MD	102	desc->provider, desc->nr_events);
8165c8da MD	103	/*
	104	* fix the events awaiting probe load.
	105	*/
	106	for (i = 0; i < desc->nr_events; i++) {
df854e41	107	ret = pending_probe_fix_events(desc->event_desc[i]);
8165c8da MD	108	assert(!ret);
8165c8da MD	109	}
ce5aef0b	110	end:
17dfb34b	111	ust_unlock();
ce5aef0b MD	112	return ret;
ce5aef0b MD	113	}
ce5aef0b MD	114
	115	void ltt_probe_unregister(struct lttng_probe_desc *desc)
	116	{
17dfb34b	117	ust_lock();
8d8a24c8	118	cds_list_del(&desc->head);
e81a53af	119	DBG("just unregistered probe %s", desc->provider);
17dfb34b	120	ust_unlock();
ce5aef0b	121	}
ce5aef0b	122
8165c8da MD	123	/*
	124	* called with UST lock held.
	125	*/
ce5aef0b MD	126	const struct lttng_event_desc ltt_event_get(const char name)
	127	{
	128	const struct lttng_event_desc *event;
ce5aef0b	129
ce5aef0b	130	event = find_event(name);
ce5aef0b MD	131	if (!event)
ce5aef0b MD	132	return NULL;
ce5aef0b MD	133	return event;
ce5aef0b MD	134	}
ce5aef0b MD	135
	136	void ltt_event_put(const struct lttng_event_desc *event)
	137	{
ce5aef0b	138	}
c8fcf224 MD	139
	140	void ltt_probes_prune_event_list(struct lttng_ust_tracepoint_list *list)
	141	{
	142	struct tp_list_entry list_entry, tmp;
	143
	144	cds_list_for_each_entry_safe(list_entry, tmp, &list->head, head) {
	145	cds_list_del(&list_entry->head);
	146	free(list_entry);
	147	}
	148	}
	149
	150	/*
	151	* called with UST lock held.
	152	*/
	153	int ltt_probes_get_event_list(struct lttng_ust_tracepoint_list *list)
	154	{
	155	struct lttng_probe_desc *probe_desc;
	156	int i;
	157
	158	CDS_INIT_LIST_HEAD(&list->head);
	159	cds_list_for_each_entry(probe_desc, &probe_list, head) {
	160	for (i = 0; i < probe_desc->nr_events; i++) {
	161	struct tp_list_entry *list_entry;
	162
	163	list_entry = zmalloc(sizeof(*list_entry));
	164	if (!list_entry)
	165	goto err_nomem;
	166	cds_list_add(&list_entry->head, &list->head);
	167	strncpy(list_entry->tp.name,
	168	probe_desc->event_desc[i]->name,
	169	LTTNG_UST_SYM_NAME_LEN);
	170	list_entry->tp.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
	171	if (!probe_desc->event_desc[i]->loglevel) {
882a56d7	172	list_entry->tp.loglevel = TRACE_DEFAULT;
c8fcf224	173	} else {
882a56d7	174	list_entry->tp.loglevel = (probe_desc->event_desc[i]->loglevel);
c8fcf224 MD	175	}
	176	}
	177	}
	178	if (cds_list_empty(&list->head))
	179	list->iter = NULL;
	180	else
	181	list->iter =
	182	cds_list_first_entry(&list->head, struct tp_list_entry, head);
	183	return 0;
	184
	185	err_nomem:
	186	ltt_probes_prune_event_list(list);
	187	return -ENOMEM;
	188	}
	189
	190	/*
	191	* Return current iteration position, advance internal iterator to next.
	192	* Return NULL if end of list.
	193	*/
	194	struct lttng_ust_tracepoint_iter *
	195	lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list)
	196	{
	197	struct tp_list_entry *entry;
	198
	199	if (!list->iter)
	200	return NULL;
	201	entry = list->iter;
	202	if (entry->head.next == &list->head)
	203	list->iter = NULL;
	204	else
	205	list->iter = cds_list_entry(entry->head.next,
	206	struct tp_list_entry, head);
	207	return &entry->tp;
	208	}
1f18504e	209
e6c12e3d MD	210	/* WILDCARDS */
	211
	212	/*
	213	* Return wildcard for a given event name if the event name match the
	214	* one of the wildcards.
	215	* Must be called with ust lock held.
	216	* Returns NULL if not present.
	217	*/
	218	struct wildcard_entry match_wildcard(const char name)
	219	{
	220	struct wildcard_entry *e;
	221
	222	cds_list_for_each_entry(e, &wildcard_list, list) {
	223	/* If only contain '' /
	224	if (strlen(e->name) == 1)
	225	return e;
	226	/* Compare excluding final '' /
	227	if (!strncmp(name, e->name, strlen(e->name) - 1))
	228	return e;
	229	}
	230	return NULL;
	231	}
	232
	233	/*
	234	* marshall all probes/all events and create those that fit the
	235	* wildcard. Add them to the events list as created.
	236	*/
	237	static
	238	void _probes_create_wildcard_events(struct wildcard_entry *entry,
	239	struct session_wildcard *wildcard)
	240	{
	241	struct lttng_probe_desc *probe_desc;
	242	struct lttng_ust_event event_param;
	243	int i;
	244
	245	cds_list_for_each_entry(probe_desc, &probe_list, head) {
	246	for (i = 0; i < probe_desc->nr_events; i++) {
	247	const struct lttng_event_desc *event_desc;
	248	int match = 0;
	249
	250	event_desc = probe_desc->event_desc[i];
	251	/* compare excluding final '' /
	252	assert(strlen(entry->name) > 0);
	253	if (strcmp(event_desc->name, "lttng_ust:metadata")
	254	&& (strlen(entry->name) == 1
	255	\|\| !strncmp(event_desc->name, entry->name,
	256	strlen(entry->name) - 1))) {
51c5df09 MD	257	/* TODO: check if loglevel match */
51c5df09 MD	258	//if (event_desc->loglevel
882a56d7	259	// && (*event_desc->loglevel) ...)
e6c12e3d MD	260	match = 1;
	261	}
	262	if (match) {
	263	struct ltt_event *ev;
	264	int ret;
	265
	266	memcpy(&event_param, &wildcard->event_param,
	267	sizeof(event_param));
	268	memcpy(event_param.name,
	269	event_desc->name,
	270	sizeof(event_param.name));
	271	/* create event */
	272	ret = ltt_event_create(wildcard->chan,
	273	&event_param, NULL,
	274	&ev);
	275	if (ret) {
	276	DBG("Error creating event");
	277	continue;
	278	}
	279	cds_list_add(&ev->wildcard_list,
	280	&wildcard->events);
	281	}
	282	}
	283	}
	284	}
	285
	286	/*
51c5df09	287	* Add the wildcard to the wildcard list. Must be called with
e6c12e3d MD	288	* ust lock held.
	289	*/
	290	struct session_wildcard add_wildcard(const char name,
	291	struct ltt_channel *chan,
	292	struct lttng_ust_event *event_param)
	293	{
	294	struct wildcard_entry *e;
	295	struct session_wildcard *sw;
	296	size_t name_len = strlen(name) + 1;
	297	int found = 0;
	298
51c5df09	299	/* try to find global wildcard entry */
e6c12e3d	300	cds_list_for_each_entry(e, &wildcard_list, list) {
ff412fb5	301	if (!strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) {
e6c12e3d MD	302	found = 1;
	303	break;
	304	}
	305	}
	306
	307	if (!found) {
	308	/*
51c5df09 MD	309	* Create global wildcard entry if not found. Using
	310	* zmalloc here to allocate a variable length element.
	311	* Could cause some memory fragmentation if overused.
e6c12e3d MD	312	*/
	313	e = zmalloc(sizeof(struct wildcard_entry) + name_len);
	314	if (!e)
	315	return ERR_PTR(-ENOMEM);
	316	memcpy(&e->name[0], name, name_len);
	317	cds_list_add(&e->list, &wildcard_list);
	318	CDS_INIT_LIST_HEAD(&e->session_list);
	319	}
	320
	321	/* session wildcard */
	322	cds_list_for_each_entry(sw, &e->session_list, session_list) {
	323	if (chan == sw->chan) {
	324	DBG("wildcard %s busy for this channel", name);
	325	return ERR_PTR(-EEXIST); /* Already there */
	326	}
	327	}
	328	sw = zmalloc(sizeof(struct session_wildcard));
	329	if (!sw)
	330	return ERR_PTR(-ENOMEM);
	331	sw->chan = chan;
	332	sw->enabled = 1;
	333	memcpy(&sw->event_param, event_param, sizeof(sw->event_param));
	334	sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT;
	335	CDS_INIT_LIST_HEAD(&sw->events);
	336	cds_list_add(&sw->list, &chan->session->wildcards);
	337	cds_list_add(&sw->session_list, &e->session_list);
	338	sw->entry = e;
	339	_probes_create_wildcard_events(e, sw);
	340	return sw;
	341	}
	342
	343	/*
51c5df09	344	* Remove the wildcard from the wildcard list. Must be called with
e6c12e3d MD	345	* ust_lock held. Only called at session teardown.
	346	*/
	347	void _remove_wildcard(struct session_wildcard *wildcard)
	348	{
	349	struct ltt_event ev, tmp;
	350
	351	/*
	352	* Just remove the events owned (for enable/disable) by this
	353	* wildcard from the list. The session teardown will take care
	354	* of freeing the event memory.
	355	*/
66221151 MD	356	cds_list_for_each_entry_safe(ev, tmp, &wildcard->events,
	357	wildcard_list) {
	358	cds_list_del(&ev->wildcard_list);
e6c12e3d MD	359	}
	360	cds_list_del(&wildcard->session_list);
	361	cds_list_del(&wildcard->list);
	362	if (cds_list_empty(&wildcard->entry->session_list)) {
	363	cds_list_del(&wildcard->entry->list);
	364	free(wildcard->entry);
	365	}
	366	free(wildcard);
	367	}
	368
	369	int ltt_wildcard_enable(struct session_wildcard *wildcard)
	370	{
	371	struct ltt_event *ev;
	372	int ret;
	373
	374	if (wildcard->enabled)
	375	return -EEXIST;
66221151	376	cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) {
e6c12e3d MD	377	ret = ltt_event_enable(ev);
	378	if (ret) {
	379	DBG("Error: enable error.\n");
	380	return ret;
	381	}
	382	}
	383	wildcard->enabled = 1;
	384	return 0;
	385	}
	386
	387	int ltt_wildcard_disable(struct session_wildcard *wildcard)
	388	{
	389	struct ltt_event *ev;
	390	int ret;
	391
	392	if (!wildcard->enabled)
	393	return -EEXIST;
66221151	394	cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) {
e6c12e3d MD	395	ret = ltt_event_disable(ev);
	396	if (ret) {
	397	DBG("Error: disable error.\n");
	398	return ret;
	399	}
	400	}
	401	wildcard->enabled = 0;
	402	return 0;
	403	}