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

/*
 * lttng-probes.c
 *
 * Holds LTTng probes registry.
 *
 * Copyright 2010-2012 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; only
 * version 2.1 of the License.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

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

#include "lttng-tracer-core.h"
#include "jhash.h"
#include "error.h"

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

struct cds_list_head *lttng_get_probe_list_head(void)
{
	return &probe_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 lttng_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++) {
		const struct lttng_event_desc *ed;

		ed = desc->event_desc[i];
		DBG("Registered event probe \"%s\" with signature \"%s\"",
			ed->name, ed->signature);
		ret = lttng_fix_pending_event_desc(ed);
		assert(!ret);
	}
end:
	ust_unlock();
	return ret;
}

/* Backward compatibility with UST 2.0 */
int ltt_probe_register(struct lttng_probe_desc *desc)
{
	return lttng_probe_register(desc);
}

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

/* Backward compatibility with UST 2.0 */
void ltt_probe_unregister(struct lttng_probe_desc *desc)
{
	lttng_probe_unregister(desc);
}

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

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

void lttng_event_put(const struct lttng_event_desc *event)
{
}

void lttng_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 lttng_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:
	lttng_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;
}

void lttng_probes_prune_field_list(struct lttng_ust_field_list *list)
{
	struct tp_field_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 lttng_probes_get_field_list(struct lttng_ust_field_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++) {
			const struct lttng_event_desc *event_desc =
				probe_desc->event_desc[i];
			int j;

			if (event_desc->nr_fields == 0) {
				/* Events without fields. */
				struct tp_field_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->field.event_name,
					event_desc->name,
					LTTNG_UST_SYM_NAME_LEN);
				list_entry->field.event_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
				list_entry->field.field_name[0] = '\0';
				list_entry->field.type = LTTNG_UST_FIELD_OTHER;
				if (!event_desc->loglevel) {
					list_entry->field.loglevel = TRACE_DEFAULT;
				} else {
					list_entry->field.loglevel = *(*event_desc->loglevel);
				}
				list_entry->field.nowrite = 1;
			}

			for (j = 0; j < event_desc->nr_fields; j++) {
				const struct lttng_event_field *event_field =
					&event_desc->fields[j];
				struct tp_field_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->field.event_name,
					event_desc->name,
					LTTNG_UST_SYM_NAME_LEN);
				list_entry->field.event_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
				strncpy(list_entry->field.field_name,
					event_field->name,
					LTTNG_UST_SYM_NAME_LEN);
				list_entry->field.field_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
				switch (event_field->type.atype) {
				case atype_integer:
					list_entry->field.type = LTTNG_UST_FIELD_INTEGER;
					break;
				case atype_string:
					list_entry->field.type = LTTNG_UST_FIELD_STRING;
					break;
				case atype_array:
					if (event_field->type.u.array.elem_type.atype != atype_integer
						|| event_field->type.u.array.elem_type.u.basic.integer.encoding == lttng_encode_none)
						list_entry->field.type = LTTNG_UST_FIELD_OTHER;
					else
						list_entry->field.type = LTTNG_UST_FIELD_STRING;
					break;
				case atype_sequence:
					if (event_field->type.u.sequence.elem_type.atype != atype_integer
						|| event_field->type.u.sequence.elem_type.u.basic.integer.encoding == lttng_encode_none)
						list_entry->field.type = LTTNG_UST_FIELD_OTHER;
					else
						list_entry->field.type = LTTNG_UST_FIELD_STRING;
					break;
				case atype_float:
					list_entry->field.type = LTTNG_UST_FIELD_FLOAT;
					break;
				case atype_enum:
					list_entry->field.type = LTTNG_UST_FIELD_ENUM;
					break;
				default:
					list_entry->field.type = LTTNG_UST_FIELD_OTHER;
				}
				if (!event_desc->loglevel) {
					list_entry->field.loglevel = TRACE_DEFAULT;
				} else {
					list_entry->field.loglevel = *(*event_desc->loglevel);
				}
				list_entry->field.nowrite = event_field->nowrite;
			}
		}
	}
	if (cds_list_empty(&list->head))
		list->iter = NULL;
	else
		list->iter =
			cds_list_first_entry(&list->head,
				struct tp_field_list_entry, head);
	return 0;

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

/*
 * Return current iteration position, advance internal iterator to next.
 * Return NULL if end of list.
 */
struct lttng_ust_field_iter *
	lttng_ust_field_list_get_iter_next(struct lttng_ust_field_list *list)
{
	struct tp_field_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_field_list_entry, head);
	return &entry->field;
}
Commit	Line	Data
ce5aef0b	1	/*
7dd08bec	2	* lttng-probes.c
ce5aef0b	3	*
ce5aef0b MD	4	* Holds LTTng probes registry.
ce5aef0b MD	5	*
e92f3e28 MD	6	* Copyright 2010-2012 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	7	*
	8	* This library is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; only
	11	* version 2.1 of the License.
	12	*
	13	* This library is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with this library; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
ce5aef0b MD	21	*/
ce5aef0b MD	22
8d8a24c8 MD	23	#include <string.h>
	24	#include <errno.h>
	25	#include <urcu/list.h>
1f18504e	26	#include <urcu/hlist.h>
4318ae1b	27	#include <lttng/ust-events.h>
902e1379	28	#include <lttng/tracepoint.h>
d8de1354	29	#include "tracepoint-internal.h"
a3bb4b27	30	#include <assert.h>
c8fcf224	31	#include <helper.h>
48740cab	32	#include <ctype.h>
ce5aef0b	33
7dd08bec	34	#include "lttng-tracer-core.h"
1f18504e MD	35	#include "jhash.h"
1f18504e MD	36	#include "error.h"
8165c8da MD	37
8165c8da MD	38	/*
17dfb34b	39	* probe list is protected by ust_lock()/ust_unlock().
8165c8da	40	*/
e58095ef MD	41	CDS_LIST_HEAD(probe_list);
	42
	43	struct cds_list_head *lttng_get_probe_list_head(void)
	44	{
	45	return &probe_list;
	46	}
ce5aef0b	47
df854e41 MD	48	static
	49	const struct lttng_probe_desc find_provider(const char provider)
	50	{
	51	struct lttng_probe_desc *iter;
	52
	53	cds_list_for_each_entry(iter, &probe_list, head) {
	54	if (!strcmp(iter->provider, provider))
	55	return iter;
	56	}
	57	return NULL;
	58	}
	59
ce5aef0b MD	60	static
	61	const struct lttng_event_desc find_event(const char name)
	62	{
	63	struct lttng_probe_desc *probe_desc;
	64	int i;
	65
8d8a24c8	66	cds_list_for_each_entry(probe_desc, &probe_list, head) {
ce5aef0b	67	for (i = 0; i < probe_desc->nr_events; i++) {
ff412fb5 MD	68	if (!strncmp(probe_desc->event_desc[i]->name, name,
ff412fb5 MD	69	LTTNG_UST_SYM_NAME_LEN - 1))
df854e41	70	return probe_desc->event_desc[i];
ce5aef0b MD	71	}
	72	}
	73	return NULL;
	74	}
	75
7dd08bec	76	int lttng_probe_register(struct lttng_probe_desc *desc)
ce5aef0b	77	{
df854e41	78	struct lttng_probe_desc *iter;
ce5aef0b MD	79	int ret = 0;
	80	int i;
	81
17dfb34b	82	ust_lock();
df854e41 MD	83	if (find_provider(desc->provider)) {
	84	ret = -EEXIST;
	85	goto end;
	86	}
ce5aef0b MD	87	/*
	88	* TODO: This is O(N^2). Turn into a hash table when probe registration
	89	* overhead becomes an issue.
	90	*/
	91	for (i = 0; i < desc->nr_events; i++) {
df854e41	92	if (find_event(desc->event_desc[i]->name)) {
ce5aef0b MD	93	ret = -EEXIST;
	94	goto end;
	95	}
	96	}
df854e41 MD	97
	98	/*
	99	* We sort the providers by struct lttng_probe_desc pointer
	100	* address.
	101	*/
	102	cds_list_for_each_entry_reverse(iter, &probe_list, head) {
	103	BUG_ON(iter == desc); /* Should never be in the list twice */
	104	if (iter < desc) {
	105	/* We belong to the location right after iter. */
	106	cds_list_add(&desc->head, &iter->head);
	107	goto desc_added;
	108	}
	109	}
	110	/* We should be added at the head of the list */
8d8a24c8	111	cds_list_add(&desc->head, &probe_list);
df854e41	112	desc_added:
e81a53af MD	113	DBG("just registered probe %s containing %u events",
e81a53af MD	114	desc->provider, desc->nr_events);
8165c8da MD	115	/*
	116	* fix the events awaiting probe load.
	117	*/
	118	for (i = 0; i < desc->nr_events; i++) {
68755429 MD	119	const struct lttng_event_desc *ed;
	120
	121	ed = desc->event_desc[i];
	122	DBG("Registered event probe \"%s\" with signature \"%s\"",
	123	ed->name, ed->signature);
e58095ef	124	ret = lttng_fix_pending_event_desc(ed);
8165c8da MD	125	assert(!ret);
8165c8da MD	126	}
ce5aef0b	127	end:
17dfb34b	128	ust_unlock();
ce5aef0b MD	129	return ret;
ce5aef0b MD	130	}
ce5aef0b	131
7dd08bec MD	132	/* Backward compatibility with UST 2.0 */
	133	int ltt_probe_register(struct lttng_probe_desc *desc)
	134	{
	135	return lttng_probe_register(desc);
	136	}
	137
	138	void lttng_probe_unregister(struct lttng_probe_desc *desc)
ce5aef0b	139	{
17dfb34b	140	ust_lock();
8d8a24c8	141	cds_list_del(&desc->head);
e81a53af	142	DBG("just unregistered probe %s", desc->provider);
17dfb34b	143	ust_unlock();
ce5aef0b	144	}
ce5aef0b	145
7dd08bec MD	146	/* Backward compatibility with UST 2.0 */
	147	void ltt_probe_unregister(struct lttng_probe_desc *desc)
	148	{
	149	lttng_probe_unregister(desc);
	150	}
	151
8165c8da MD	152	/*
	153	* called with UST lock held.
	154	*/
7dd08bec	155	const struct lttng_event_desc lttng_event_get(const char name)
ce5aef0b MD	156	{
ce5aef0b MD	157	const struct lttng_event_desc *event;
ce5aef0b	158
ce5aef0b	159	event = find_event(name);
ce5aef0b MD	160	if (!event)
ce5aef0b MD	161	return NULL;
ce5aef0b MD	162	return event;
ce5aef0b MD	163	}
ce5aef0b	164
7dd08bec	165	void lttng_event_put(const struct lttng_event_desc *event)
ce5aef0b	166	{
ce5aef0b	167	}
c8fcf224	168
7dd08bec	169	void lttng_probes_prune_event_list(struct lttng_ust_tracepoint_list *list)
c8fcf224 MD	170	{
	171	struct tp_list_entry list_entry, tmp;
	172
	173	cds_list_for_each_entry_safe(list_entry, tmp, &list->head, head) {
	174	cds_list_del(&list_entry->head);
	175	free(list_entry);
	176	}
	177	}
	178
	179	/*
	180	* called with UST lock held.
	181	*/
7dd08bec	182	int lttng_probes_get_event_list(struct lttng_ust_tracepoint_list *list)
c8fcf224 MD	183	{
	184	struct lttng_probe_desc *probe_desc;
	185	int i;
	186
	187	CDS_INIT_LIST_HEAD(&list->head);
	188	cds_list_for_each_entry(probe_desc, &probe_list, head) {
	189	for (i = 0; i < probe_desc->nr_events; i++) {
	190	struct tp_list_entry *list_entry;
	191
	192	list_entry = zmalloc(sizeof(*list_entry));
	193	if (!list_entry)
	194	goto err_nomem;
	195	cds_list_add(&list_entry->head, &list->head);
	196	strncpy(list_entry->tp.name,
	197	probe_desc->event_desc[i]->name,
	198	LTTNG_UST_SYM_NAME_LEN);
	199	list_entry->tp.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
	200	if (!probe_desc->event_desc[i]->loglevel) {
882a56d7	201	list_entry->tp.loglevel = TRACE_DEFAULT;
c8fcf224	202	} else {
882a56d7	203	list_entry->tp.loglevel = (probe_desc->event_desc[i]->loglevel);
c8fcf224 MD	204	}
	205	}
	206	}
	207	if (cds_list_empty(&list->head))
	208	list->iter = NULL;
	209	else
	210	list->iter =
	211	cds_list_first_entry(&list->head, struct tp_list_entry, head);
	212	return 0;
	213
	214	err_nomem:
7dd08bec	215	lttng_probes_prune_event_list(list);
c8fcf224 MD	216	return -ENOMEM;
	217	}
	218
	219	/*
	220	* Return current iteration position, advance internal iterator to next.
	221	* Return NULL if end of list.
	222	*/
	223	struct lttng_ust_tracepoint_iter *
	224	lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list)
	225	{
	226	struct tp_list_entry *entry;
	227
	228	if (!list->iter)
	229	return NULL;
	230	entry = list->iter;
	231	if (entry->head.next == &list->head)
	232	list->iter = NULL;
	233	else
	234	list->iter = cds_list_entry(entry->head.next,
	235	struct tp_list_entry, head);
	236	return &entry->tp;
	237	}
1f18504e	238
7dd08bec	239	void lttng_probes_prune_field_list(struct lttng_ust_field_list *list)
06d4f27e MD	240	{
	241	struct tp_field_list_entry list_entry, tmp;
	242
	243	cds_list_for_each_entry_safe(list_entry, tmp, &list->head, head) {
	244	cds_list_del(&list_entry->head);
	245	free(list_entry);
	246	}
	247	}
	248
	249	/*
	250	* called with UST lock held.
	251	*/
7dd08bec	252	int lttng_probes_get_field_list(struct lttng_ust_field_list *list)
06d4f27e MD	253	{
	254	struct lttng_probe_desc *probe_desc;
	255	int i;
	256
	257	CDS_INIT_LIST_HEAD(&list->head);
	258	cds_list_for_each_entry(probe_desc, &probe_list, head) {
	259	for (i = 0; i < probe_desc->nr_events; i++) {
	260	const struct lttng_event_desc *event_desc =
	261	probe_desc->event_desc[i];
	262	int j;
	263
26329f26 MD	264	if (event_desc->nr_fields == 0) {
	265	/* Events without fields. */
	266	struct tp_field_list_entry *list_entry;
	267
	268	list_entry = zmalloc(sizeof(*list_entry));
	269	if (!list_entry)
	270	goto err_nomem;
	271	cds_list_add(&list_entry->head, &list->head);
	272	strncpy(list_entry->field.event_name,
	273	event_desc->name,
	274	LTTNG_UST_SYM_NAME_LEN);
	275	list_entry->field.event_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
	276	list_entry->field.field_name[0] = '\0';
	277	list_entry->field.type = LTTNG_UST_FIELD_OTHER;
	278	if (!event_desc->loglevel) {
	279	list_entry->field.loglevel = TRACE_DEFAULT;
	280	} else {
	281	list_entry->field.loglevel = (event_desc->loglevel);
	282	}
	283	list_entry->field.nowrite = 1;
	284	}
	285
06d4f27e MD	286	for (j = 0; j < event_desc->nr_fields; j++) {
	287	const struct lttng_event_field *event_field =
	288	&event_desc->fields[j];
	289	struct tp_field_list_entry *list_entry;
	290
	291	list_entry = zmalloc(sizeof(*list_entry));
	292	if (!list_entry)
	293	goto err_nomem;
	294	cds_list_add(&list_entry->head, &list->head);
	295	strncpy(list_entry->field.event_name,
	296	event_desc->name,
	297	LTTNG_UST_SYM_NAME_LEN);
	298	list_entry->field.event_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
	299	strncpy(list_entry->field.field_name,
	300	event_field->name,
	301	LTTNG_UST_SYM_NAME_LEN);
	302	list_entry->field.field_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
40003310 MD	303	switch (event_field->type.atype) {
	304	case atype_integer:
	305	list_entry->field.type = LTTNG_UST_FIELD_INTEGER;
	306	break;
	307	case atype_string:
	308	list_entry->field.type = LTTNG_UST_FIELD_STRING;
	309	break;
	310	case atype_array:
	311	if (event_field->type.u.array.elem_type.atype != atype_integer
	312	\|\| event_field->type.u.array.elem_type.u.basic.integer.encoding == lttng_encode_none)
	313	list_entry->field.type = LTTNG_UST_FIELD_OTHER;
	314	else
	315	list_entry->field.type = LTTNG_UST_FIELD_STRING;
	316	break;
	317	case atype_sequence:
	318	if (event_field->type.u.sequence.elem_type.atype != atype_integer
	319	\|\| event_field->type.u.sequence.elem_type.u.basic.integer.encoding == lttng_encode_none)
	320	list_entry->field.type = LTTNG_UST_FIELD_OTHER;
	321	else
	322	list_entry->field.type = LTTNG_UST_FIELD_STRING;
	323	break;
	324	case atype_float:
	325	list_entry->field.type = LTTNG_UST_FIELD_FLOAT;
	326	break;
	327	case atype_enum:
	328	list_entry->field.type = LTTNG_UST_FIELD_ENUM;
	329	break;
	330	default:
	331	list_entry->field.type = LTTNG_UST_FIELD_OTHER;
	332	}
06d4f27e MD	333	if (!event_desc->loglevel) {
	334	list_entry->field.loglevel = TRACE_DEFAULT;
	335	} else {
	336	list_entry->field.loglevel = (event_desc->loglevel);
	337	}
180901e6	338	list_entry->field.nowrite = event_field->nowrite;
06d4f27e MD	339	}
	340	}
	341	}
	342	if (cds_list_empty(&list->head))
	343	list->iter = NULL;
	344	else
	345	list->iter =
	346	cds_list_first_entry(&list->head,
	347	struct tp_field_list_entry, head);
	348	return 0;
	349
	350	err_nomem:
7dd08bec	351	lttng_probes_prune_field_list(list);
06d4f27e MD	352	return -ENOMEM;
	353	}
	354
	355	/*
	356	* Return current iteration position, advance internal iterator to next.
	357	* Return NULL if end of list.
	358	*/
	359	struct lttng_ust_field_iter *
	360	lttng_ust_field_list_get_iter_next(struct lttng_ust_field_list *list)
	361	{
	362	struct tp_field_list_entry *entry;
	363
	364	if (!list->iter)
	365	return NULL;
	366	entry = list->iter;
	367	if (entry->head.next == &list->head)
	368	list->iter = NULL;
	369	else
	370	list->iter = cds_list_entry(entry->head.next,
	371	struct tp_field_list_entry, head);
	372	return &entry->field;
	373	}