[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().
 */
static 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;
	struct cds_list_head *probe_list;

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

static
int check_event_provider(struct lttng_probe_desc *desc)
{
	int i;
	size_t provider_name_len;

	provider_name_len = strnlen(desc->provider,
				LTTNG_UST_SYM_NAME_LEN - 1);
	for (i = 0; i < desc->nr_events; i++) {
		if (strncmp(desc->event_desc[i]->name,
				desc->provider,
				provider_name_len))
			return 0;	/* provider mismatch */
	}
	return 1;
}

int lttng_probe_register(struct lttng_probe_desc *desc)
{
	struct lttng_probe_desc *iter;
	int ret = 0;
	int i;
	struct cds_list_head *probe_list;

	ust_lock();

	/*
	 * Check if the provider has already been registered.
	 */
	if (find_provider(desc->provider)) {
		ret = -EEXIST;
		goto end;
	}

	/*
	 * Each provider enforce that every event name begins with the
	 * provider name. Check this in an assertion for extra
	 * carefulness. This ensures we cannot have duplicate event
	 * names across providers.
	 */
	assert(check_event_provider(desc));

	/*
	 * The provider ensures there are no duplicate event names.
	 * Duplicated TRACEPOINT_EVENT event names would generate a
	 * compile-time error due to duplicated symbol names.
	 */

	/*
	 * We sort the providers by struct lttng_probe_desc pointer
	 * address.
	 */
	probe_list = lttng_get_probe_list_head();
	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);
}

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;
	struct cds_list_head *probe_list;

	probe_list = lttng_get_probe_list_head();
	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;
	struct cds_list_head *probe_list;

	probe_list = lttng_get_probe_list_head();
	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	*/
ac69b35b	41	static CDS_LIST_HEAD(_probe_list);
e58095ef MD	42
	43	struct cds_list_head *lttng_get_probe_list_head(void)
	44	{
ac69b35b	45	return &_probe_list;
e58095ef	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;
ac69b35b	52	struct cds_list_head *probe_list;
df854e41	53
ac69b35b MD	54	probe_list = lttng_get_probe_list_head();
ac69b35b MD	55	cds_list_for_each_entry(iter, probe_list, head) {
df854e41 MD	56	if (!strcmp(iter->provider, provider))
	57	return iter;
	58	}
	59	return NULL;
	60	}
	61
ce5aef0b	62	static
48205d60	63	int check_event_provider(struct lttng_probe_desc *desc)
ce5aef0b	64	{
ce5aef0b	65	int i;
48205d60	66	size_t provider_name_len;
ce5aef0b	67
48205d60 MD	68	provider_name_len = strnlen(desc->provider,
	69	LTTNG_UST_SYM_NAME_LEN - 1);
	70	for (i = 0; i < desc->nr_events; i++) {
	71	if (strncmp(desc->event_desc[i]->name,
	72	desc->provider,
	73	provider_name_len))
	74	return 0; /* provider mismatch */
ce5aef0b	75	}
48205d60	76	return 1;
ce5aef0b MD	77	}
ce5aef0b MD	78
7dd08bec	79	int lttng_probe_register(struct lttng_probe_desc *desc)
ce5aef0b	80	{
df854e41	81	struct lttng_probe_desc *iter;
ce5aef0b MD	82	int ret = 0;
ce5aef0b MD	83	int i;
ac69b35b	84	struct cds_list_head *probe_list;
ce5aef0b	85
17dfb34b	86	ust_lock();
48205d60 MD	87
	88	/*
	89	* Check if the provider has already been registered.
	90	*/
df854e41 MD	91	if (find_provider(desc->provider)) {
	92	ret = -EEXIST;
	93	goto end;
	94	}
48205d60	95
ce5aef0b	96	/*
48205d60 MD	97	* Each provider enforce that every event name begins with the
	98	* provider name. Check this in an assertion for extra
	99	* carefulness. This ensures we cannot have duplicate event
	100	* names across providers.
	101	*/
	102	assert(check_event_provider(desc));
	103
	104	/*
	105	* The provider ensures there are no duplicate event names.
	106	* Duplicated TRACEPOINT_EVENT event names would generate a
	107	* compile-time error due to duplicated symbol names.
ce5aef0b	108	*/
df854e41 MD	109
	110	/*
	111	* We sort the providers by struct lttng_probe_desc pointer
	112	* address.
	113	*/
ac69b35b MD	114	probe_list = lttng_get_probe_list_head();
ac69b35b MD	115	cds_list_for_each_entry_reverse(iter, probe_list, head) {
df854e41 MD	116	BUG_ON(iter == desc); /* Should never be in the list twice */
	117	if (iter < desc) {
	118	/* We belong to the location right after iter. */
	119	cds_list_add(&desc->head, &iter->head);
	120	goto desc_added;
	121	}
	122	}
	123	/* We should be added at the head of the list */
ac69b35b	124	cds_list_add(&desc->head, probe_list);
df854e41	125	desc_added:
e81a53af MD	126	DBG("just registered probe %s containing %u events",
e81a53af MD	127	desc->provider, desc->nr_events);
8165c8da MD	128	/*
	129	* fix the events awaiting probe load.
	130	*/
	131	for (i = 0; i < desc->nr_events; i++) {
68755429 MD	132	const struct lttng_event_desc *ed;
	133
	134	ed = desc->event_desc[i];
	135	DBG("Registered event probe \"%s\" with signature \"%s\"",
	136	ed->name, ed->signature);
e58095ef	137	ret = lttng_fix_pending_event_desc(ed);
8165c8da MD	138	assert(!ret);
8165c8da MD	139	}
ce5aef0b	140	end:
17dfb34b	141	ust_unlock();
ce5aef0b MD	142	return ret;
ce5aef0b MD	143	}
ce5aef0b	144
7dd08bec MD	145	/* Backward compatibility with UST 2.0 */
	146	int ltt_probe_register(struct lttng_probe_desc *desc)
	147	{
	148	return lttng_probe_register(desc);
	149	}
	150
	151	void lttng_probe_unregister(struct lttng_probe_desc *desc)
ce5aef0b	152	{
17dfb34b	153	ust_lock();
8d8a24c8	154	cds_list_del(&desc->head);
e81a53af	155	DBG("just unregistered probe %s", desc->provider);
17dfb34b	156	ust_unlock();
ce5aef0b	157	}
ce5aef0b	158
7dd08bec MD	159	/* Backward compatibility with UST 2.0 */
	160	void ltt_probe_unregister(struct lttng_probe_desc *desc)
	161	{
	162	lttng_probe_unregister(desc);
	163	}
	164
7dd08bec	165	void lttng_probes_prune_event_list(struct lttng_ust_tracepoint_list *list)
c8fcf224 MD	166	{
	167	struct tp_list_entry list_entry, tmp;
	168
	169	cds_list_for_each_entry_safe(list_entry, tmp, &list->head, head) {
	170	cds_list_del(&list_entry->head);
	171	free(list_entry);
	172	}
	173	}
	174
	175	/*
	176	* called with UST lock held.
	177	*/
7dd08bec	178	int lttng_probes_get_event_list(struct lttng_ust_tracepoint_list *list)
c8fcf224 MD	179	{
	180	struct lttng_probe_desc *probe_desc;
	181	int i;
ac69b35b	182	struct cds_list_head *probe_list;
c8fcf224	183
ac69b35b	184	probe_list = lttng_get_probe_list_head();
c8fcf224	185	CDS_INIT_LIST_HEAD(&list->head);
ac69b35b	186	cds_list_for_each_entry(probe_desc, probe_list, head) {
c8fcf224 MD	187	for (i = 0; i < probe_desc->nr_events; i++) {
	188	struct tp_list_entry *list_entry;
	189
	190	list_entry = zmalloc(sizeof(*list_entry));
	191	if (!list_entry)
	192	goto err_nomem;
	193	cds_list_add(&list_entry->head, &list->head);
	194	strncpy(list_entry->tp.name,
	195	probe_desc->event_desc[i]->name,
	196	LTTNG_UST_SYM_NAME_LEN);
	197	list_entry->tp.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
	198	if (!probe_desc->event_desc[i]->loglevel) {
882a56d7	199	list_entry->tp.loglevel = TRACE_DEFAULT;
c8fcf224	200	} else {
882a56d7	201	list_entry->tp.loglevel = (probe_desc->event_desc[i]->loglevel);
c8fcf224 MD	202	}
	203	}
	204	}
	205	if (cds_list_empty(&list->head))
	206	list->iter = NULL;
	207	else
	208	list->iter =
	209	cds_list_first_entry(&list->head, struct tp_list_entry, head);
	210	return 0;
	211
	212	err_nomem:
7dd08bec	213	lttng_probes_prune_event_list(list);
c8fcf224 MD	214	return -ENOMEM;
	215	}
	216
	217	/*
	218	* Return current iteration position, advance internal iterator to next.
	219	* Return NULL if end of list.
	220	*/
	221	struct lttng_ust_tracepoint_iter *
	222	lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list)
	223	{
	224	struct tp_list_entry *entry;
	225
	226	if (!list->iter)
	227	return NULL;
	228	entry = list->iter;
	229	if (entry->head.next == &list->head)
	230	list->iter = NULL;
	231	else
	232	list->iter = cds_list_entry(entry->head.next,
	233	struct tp_list_entry, head);
	234	return &entry->tp;
	235	}
1f18504e	236
7dd08bec	237	void lttng_probes_prune_field_list(struct lttng_ust_field_list *list)
06d4f27e MD	238	{
	239	struct tp_field_list_entry list_entry, tmp;
	240
	241	cds_list_for_each_entry_safe(list_entry, tmp, &list->head, head) {
	242	cds_list_del(&list_entry->head);
	243	free(list_entry);
	244	}
	245	}
	246
	247	/*
	248	* called with UST lock held.
	249	*/
7dd08bec	250	int lttng_probes_get_field_list(struct lttng_ust_field_list *list)
06d4f27e MD	251	{
	252	struct lttng_probe_desc *probe_desc;
	253	int i;
ac69b35b	254	struct cds_list_head *probe_list;
06d4f27e	255
ac69b35b	256	probe_list = lttng_get_probe_list_head();
06d4f27e	257	CDS_INIT_LIST_HEAD(&list->head);
ac69b35b	258	cds_list_for_each_entry(probe_desc, probe_list, head) {
06d4f27e MD	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	}