[lttng-ust.git] / src / lib / lttng-ust / lttng-probes.c

/*
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 * Copyright 2010-2012 (C) Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Holds LTTng probes registry.
 */

#define _LGPL_SOURCE
#include <string.h>
#include <errno.h>
#include <urcu/list.h>
#include <urcu/hlist.h>
#include <lttng/ust-events.h>
#include <lttng/tracepoint.h>
#include "common/tracepoint.h"
#include <assert.h>
#include "common/macros.h"
#include <ctype.h>

#include "lttng-tracer-core.h"
#include "common/jhash.h"
#include "lib/lttng-ust/events.h"

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

/*
 * List of probes registered by not yet processed.
 */
static CDS_LIST_HEAD(lazy_probe_init);

/*
 * lazy_nesting counter ensures we don't trigger lazy probe registration
 * fixup while we are performing the fixup. It is protected by the ust
 * mutex.
 */
static int lazy_nesting;

/*
 * Validate that each event within the probe provider refers to the
 * right probe, and that the resulting name is not too long.
 */
static
bool check_event_provider(const struct lttng_ust_probe_desc *probe_desc)
{
	int i;

	for (i = 0; i < probe_desc->nr_events; i++) {
		const struct lttng_ust_event_desc *event_desc = probe_desc->event_desc[i];

		if (event_desc->probe_desc != probe_desc) {
			ERR("Error registering probe provider '%s'. Event '%s:%s' refers to the wrong provider descriptor.",
				probe_desc->provider_name, probe_desc->provider_name, event_desc->event_name);
			return false;	/* provider mismatch */
		}
		if (!lttng_ust_validate_event_name(event_desc)) {
			ERR("Error registering probe provider '%s'. Event '%s:%s' name is too long.",
				probe_desc->provider_name, probe_desc->provider_name, event_desc->event_name);
			return false;	/* provider mismatch */
		}
	}
	return true;
}

/*
 * Called under ust lock.
 */
static
void lttng_lazy_probe_register(struct lttng_ust_registered_probe *reg_probe)
{
	struct lttng_ust_registered_probe *iter;
	struct cds_list_head *probe_list;

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

	/*
	 * We sort the providers by struct lttng_ust_probe_desc pointer
	 * address.
	 */
	probe_list = &_probe_list;
	cds_list_for_each_entry_reverse(iter, probe_list, head) {
		BUG_ON(iter == reg_probe); /* Should never be in the list twice */
		if (iter < reg_probe) {
			/* We belong to the location right after iter. */
			cds_list_add(&reg_probe->head, &iter->head);
			goto probe_added;
		}
	}
	/* We should be added at the head of the list */
	cds_list_add(&reg_probe->head, probe_list);
probe_added:
	DBG("just registered probe %s containing %u events",
		reg_probe->desc->provider_name, reg_probe->desc->nr_events);
}

/*
 * Called under ust lock.
 */
static
void fixup_lazy_probes(void)
{
	struct lttng_ust_registered_probe *iter, *tmp;
	int ret;

	lazy_nesting++;
	cds_list_for_each_entry_safe(iter, tmp,
			&lazy_probe_init, lazy_init_head) {
		lttng_lazy_probe_register(iter);
		iter->lazy = 0;
		cds_list_del(&iter->lazy_init_head);
	}
	ret = lttng_fix_pending_events();
	assert(!ret);
	lazy_nesting--;
}

/*
 * Called under ust lock.
 */
struct cds_list_head *lttng_get_probe_list_head(void)
{
	if (!lazy_nesting && !cds_list_empty(&lazy_probe_init))
		fixup_lazy_probes();
	return &_probe_list;
}

static
int check_provider_version(const struct lttng_ust_probe_desc *desc)
{
	/*
	 * Check tracepoint provider version compatibility.
	 */
	if (desc->major <= LTTNG_UST_PROVIDER_MAJOR) {
		DBG("Provider \"%s\" accepted, version %u.%u is compatible "
			"with LTTng UST provider version %u.%u.",
			desc->provider_name, desc->major, desc->minor,
			LTTNG_UST_PROVIDER_MAJOR,
			LTTNG_UST_PROVIDER_MINOR);
		if (desc->major < LTTNG_UST_PROVIDER_MAJOR) {
			DBG("However, some LTTng UST features might not be "
				"available for this provider unless it is "
				"recompiled against a more recent LTTng UST.");
		}
		return 1;		/* accept */
	} else {
		ERR("Provider \"%s\" rejected, version %u.%u is incompatible "
			"with LTTng UST provider version %u.%u. Please upgrade "
			"LTTng UST.",
			desc->provider_name, desc->major, desc->minor,
			LTTNG_UST_PROVIDER_MAJOR,
			LTTNG_UST_PROVIDER_MINOR);
		return 0;		/* reject */
	}
}

struct lttng_ust_registered_probe *lttng_ust_probe_register(const struct lttng_ust_probe_desc *desc)
{
	struct lttng_ust_registered_probe *reg_probe = NULL;

	lttng_ust_alloc_tls();

	/*
	 * If version mismatch, don't register, but don't trigger assert
	 * on caller. The version check just prints an error.
	 */
	if (!check_provider_version(desc))
		return NULL;
	if (!check_event_provider(desc))
		return NULL;

	ust_lock_nocheck();

	reg_probe = zmalloc(sizeof(struct lttng_ust_registered_probe));
	if (!reg_probe)
		goto end;
	reg_probe->desc = desc;
	cds_list_add(&reg_probe->lazy_init_head, &lazy_probe_init);
	reg_probe->lazy = 1;

	DBG("adding probe %s containing %u events to lazy registration list",
		desc->provider_name, desc->nr_events);
	/*
	 * If there is at least one active session, we need to register
	 * the probe immediately, since we cannot delay event
	 * registration because they are needed ASAP.
	 */
	if (lttng_session_active())
		fixup_lazy_probes();

	lttng_fix_pending_event_notifiers();
end:
	ust_unlock();
	return reg_probe;
}

void lttng_ust_probe_unregister(struct lttng_ust_registered_probe *reg_probe)
{
	lttng_ust_alloc_tls();

	if (!reg_probe)
		return;
	if (!check_provider_version(reg_probe->desc))
		return;

	ust_lock_nocheck();
	if (!reg_probe->lazy)
		cds_list_del(&reg_probe->head);
	else
		cds_list_del(&reg_probe->lazy_init_head);

	lttng_probe_provider_unregister_events(reg_probe->desc);
	DBG("just unregistered probes of provider %s", reg_probe->desc->provider_name);
	ust_unlock();
	free(reg_probe);
}

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_ust_registered_probe *reg_probe;
	struct cds_list_head *probe_list;
	int i;

	probe_list = lttng_get_probe_list_head();
	CDS_INIT_LIST_HEAD(&list->head);
	cds_list_for_each_entry(reg_probe, probe_list, head) {
		const struct lttng_ust_probe_desc *probe_desc = reg_probe->desc;

		for (i = 0; i < probe_desc->nr_events; i++) {
			const struct lttng_ust_event_desc *event_desc =
				probe_desc->event_desc[i];
			struct tp_list_entry *list_entry;

			/* Skip event if name is too long. */
			if (!lttng_ust_validate_event_name(event_desc))
				continue;
			list_entry = zmalloc(sizeof(*list_entry));
			if (!list_entry)
				goto err_nomem;
			cds_list_add(&list_entry->head, &list->head);
			lttng_ust_format_event_name(event_desc, list_entry->tp.name);
			if (!event_desc->loglevel) {
				list_entry->tp.loglevel = LTTNG_UST_TRACEPOINT_LOGLEVEL_DEFAULT;
			} else {
				list_entry->tp.loglevel = *(*event_desc->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_abi_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_ust_registered_probe *reg_probe;
	struct cds_list_head *probe_list;
	int i;

	probe_list = lttng_get_probe_list_head();
	CDS_INIT_LIST_HEAD(&list->head);
	cds_list_for_each_entry(reg_probe, probe_list, head) {
		const struct lttng_ust_probe_desc *probe_desc = reg_probe->desc;

		for (i = 0; i < probe_desc->nr_events; i++) {
			const struct lttng_ust_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;

				/* Skip event if name is too long. */
				if (!lttng_ust_validate_event_name(event_desc))
					continue;
				list_entry = zmalloc(sizeof(*list_entry));
				if (!list_entry)
					goto err_nomem;
				cds_list_add(&list_entry->head, &list->head);
				lttng_ust_format_event_name(event_desc, list_entry->field.event_name);
				list_entry->field.field_name[0] = '\0';
				list_entry->field.type = LTTNG_UST_ABI_FIELD_OTHER;
				if (!event_desc->loglevel) {
					list_entry->field.loglevel = LTTNG_UST_TRACEPOINT_LOGLEVEL_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_ust_event_field *event_field =
					event_desc->fields[j];
				struct tp_field_list_entry *list_entry;

				/* Skip event if name is too long. */
				if (!lttng_ust_validate_event_name(event_desc))
					continue;
				list_entry = zmalloc(sizeof(*list_entry));
				if (!list_entry)
					goto err_nomem;
				cds_list_add(&list_entry->head, &list->head);
				lttng_ust_format_event_name(event_desc, list_entry->field.event_name);
				strncpy(list_entry->field.field_name,
					event_field->name,
					LTTNG_UST_ABI_SYM_NAME_LEN);
				list_entry->field.field_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
				switch (event_field->type->type) {
				case lttng_ust_type_integer:
					list_entry->field.type = LTTNG_UST_ABI_FIELD_INTEGER;
					break;
				case lttng_ust_type_string:
					list_entry->field.type = LTTNG_UST_ABI_FIELD_STRING;
					break;
				case lttng_ust_type_array:
					if (lttng_ust_get_type_array(event_field->type)->encoding == lttng_ust_string_encoding_none)
						list_entry->field.type = LTTNG_UST_ABI_FIELD_OTHER;
					else
						list_entry->field.type = LTTNG_UST_ABI_FIELD_STRING;
					break;
				case lttng_ust_type_sequence:
					if (lttng_ust_get_type_sequence(event_field->type)->encoding == lttng_ust_string_encoding_none)
						list_entry->field.type = LTTNG_UST_ABI_FIELD_OTHER;
					else
						list_entry->field.type = LTTNG_UST_ABI_FIELD_STRING;
					break;
				case lttng_ust_type_float:
					list_entry->field.type = LTTNG_UST_ABI_FIELD_FLOAT;
					break;
				case lttng_ust_type_enum:
					list_entry->field.type = LTTNG_UST_ABI_FIELD_ENUM;
					break;
				default:
					list_entry->field.type = LTTNG_UST_ABI_FIELD_OTHER;
				}
				if (!event_desc->loglevel) {
					list_entry->field.loglevel = LTTNG_UST_TRACEPOINT_LOGLEVEL_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_abi_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	/*
c0c0989a	2	* SPDX-License-Identifier: LGPL-2.1-only
ce5aef0b	3	*
c0c0989a	4	* Copyright 2010-2012 (C) Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
e92f3e28	5	*
c0c0989a	6	* Holds LTTng probes registry.
ce5aef0b MD	7	*/
ce5aef0b MD	8
3fbec7dc	9	#define _LGPL_SOURCE
8d8a24c8 MD	10	#include <string.h>
	11	#include <errno.h>
	12	#include <urcu/list.h>
1f18504e	13	#include <urcu/hlist.h>
4318ae1b	14	#include <lttng/ust-events.h>
902e1379	15	#include <lttng/tracepoint.h>
8f51c684	16	#include "common/tracepoint.h"
a3bb4b27	17	#include <assert.h>
9d315d6d	18	#include "common/macros.h"
48740cab	19	#include <ctype.h>
ce5aef0b	20
7dd08bec	21	#include "lttng-tracer-core.h"
e58e5ad5	22	#include "common/jhash.h"
36c52fff	23	#include "lib/lttng-ust/events.h"
8165c8da MD	24
8165c8da MD	25	/*
17dfb34b	26	* probe list is protected by ust_lock()/ust_unlock().
8165c8da	27	*/
ac69b35b	28	static CDS_LIST_HEAD(_probe_list);
e58095ef	29
6715d7d1 MD	30	/*
	31	* List of probes registered by not yet processed.
	32	*/
	33	static CDS_LIST_HEAD(lazy_probe_init);
df854e41	34
6715d7d1 MD	35	/*
	36	* lazy_nesting counter ensures we don't trigger lazy probe registration
	37	* fixup while we are performing the fixup. It is protected by the ust
	38	* mutex.
	39	*/
	40	static int lazy_nesting;
df854e41	41
6715d7d1	42	/*
5b4c6da4 MD	43	* Validate that each event within the probe provider refers to the
5b4c6da4 MD	44	* right probe, and that the resulting name is not too long.
6715d7d1	45	*/
ce5aef0b	46	static
4e48b5d2	47	bool check_event_provider(const struct lttng_ust_probe_desc *probe_desc)
ce5aef0b	48	{
ce5aef0b	49	int i;
5b4c6da4 MD	50
	51	for (i = 0; i < probe_desc->nr_events; i++) {
	52	const struct lttng_ust_event_desc *event_desc = probe_desc->event_desc[i];
	53
	54	if (event_desc->probe_desc != probe_desc) {
	55	ERR("Error registering probe provider '%s'. Event '%s:%s' refers to the wrong provider descriptor.",
	56	probe_desc->provider_name, probe_desc->provider_name, event_desc->event_name);
	57	return false; /* provider mismatch */
	58	}
	59	if (!lttng_ust_validate_event_name(event_desc)) {
	60	ERR("Error registering probe provider '%s'. Event '%s:%s' name is too long.",
	61	probe_desc->provider_name, probe_desc->provider_name, event_desc->event_name);
	62	return false; /* provider mismatch */
	63	}
ce5aef0b	64	}
5b4c6da4	65	return true;
ce5aef0b MD	66	}
ce5aef0b MD	67
6715d7d1 MD	68	/*
	69	* Called under ust lock.
	70	*/
	71	static
4e48b5d2	72	void lttng_lazy_probe_register(struct lttng_ust_registered_probe *reg_probe)
ce5aef0b	73	{
4e48b5d2	74	struct lttng_ust_registered_probe *iter;
ac69b35b	75	struct cds_list_head *probe_list;
48205d60	76
48205d60 MD	77	/*
48205d60 MD	78	* The provider ensures there are no duplicate event names.
7f2f82c3	79	* Duplicated LTTNG_UST_TRACEPOINT_EVENT event names would generate a
48205d60	80	* compile-time error due to duplicated symbol names.
ce5aef0b	81	*/
df854e41 MD	82
df854e41 MD	83	/*
dc11f93f	84	* We sort the providers by struct lttng_ust_probe_desc pointer
df854e41 MD	85	* address.
df854e41 MD	86	*/
6715d7d1	87	probe_list = &_probe_list;
ac69b35b	88	cds_list_for_each_entry_reverse(iter, probe_list, head) {
4e48b5d2 MD	89	BUG_ON(iter == reg_probe); /* Should never be in the list twice */
4e48b5d2 MD	90	if (iter < reg_probe) {
df854e41	91	/* We belong to the location right after iter. */
4e48b5d2 MD	92	cds_list_add(&reg_probe->head, &iter->head);
4e48b5d2 MD	93	goto probe_added;
df854e41 MD	94	}
	95	}
	96	/* We should be added at the head of the list */
4e48b5d2 MD	97	cds_list_add(&reg_probe->head, probe_list);
4e48b5d2 MD	98	probe_added:
e81a53af	99	DBG("just registered probe %s containing %u events",
4e48b5d2	100	reg_probe->desc->provider_name, reg_probe->desc->nr_events);
6715d7d1 MD	101	}
	102
	103	/*
	104	* Called under ust lock.
	105	*/
	106	static
	107	void fixup_lazy_probes(void)
	108	{
4e48b5d2	109	struct lttng_ust_registered_probe iter, tmp;
5f733922	110	int ret;
6715d7d1 MD	111
	112	lazy_nesting++;
	113	cds_list_for_each_entry_safe(iter, tmp,
	114	&lazy_probe_init, lazy_init_head) {
	115	lttng_lazy_probe_register(iter);
	116	iter->lazy = 0;
	117	cds_list_del(&iter->lazy_init_head);
	118	}
5f733922 MD	119	ret = lttng_fix_pending_events();
5f733922 MD	120	assert(!ret);
6715d7d1 MD	121	lazy_nesting--;
	122	}
	123
	124	/*
	125	* Called under ust lock.
	126	*/
	127	struct cds_list_head *lttng_get_probe_list_head(void)
	128	{
	129	if (!lazy_nesting && !cds_list_empty(&lazy_probe_init))
	130	fixup_lazy_probes();
	131	return &_probe_list;
	132	}
	133
71d31690	134	static
4e48b5d2	135	int check_provider_version(const struct lttng_ust_probe_desc *desc)
71d31690 MD	136	{
	137	/*
	138	* Check tracepoint provider version compatibility.
	139	*/
	140	if (desc->major <= LTTNG_UST_PROVIDER_MAJOR) {
	141	DBG("Provider \"%s\" accepted, version %u.%u is compatible "
	142	"with LTTng UST provider version %u.%u.",
5b4c6da4	143	desc->provider_name, desc->major, desc->minor,
71d31690 MD	144	LTTNG_UST_PROVIDER_MAJOR,
	145	LTTNG_UST_PROVIDER_MINOR);
	146	if (desc->major < LTTNG_UST_PROVIDER_MAJOR) {
	147	DBG("However, some LTTng UST features might not be "
	148	"available for this provider unless it is "
	149	"recompiled against a more recent LTTng UST.");
	150	}
	151	return 1; /* accept */
	152	} else {
	153	ERR("Provider \"%s\" rejected, version %u.%u is incompatible "
	154	"with LTTng UST provider version %u.%u. Please upgrade "
	155	"LTTng UST.",
5b4c6da4	156	desc->provider_name, desc->major, desc->minor,
71d31690 MD	157	LTTNG_UST_PROVIDER_MAJOR,
	158	LTTNG_UST_PROVIDER_MINOR);
	159	return 0; /* reject */
	160	}
	161	}
	162
4e48b5d2	163	struct lttng_ust_registered_probe lttng_ust_probe_register(const struct lttng_ust_probe_desc desc)
6715d7d1	164	{
4e48b5d2	165	struct lttng_ust_registered_probe *reg_probe = NULL;
6715d7d1	166
a9fd951a	167	lttng_ust_alloc_tls();
c362addf	168
71d31690 MD	169	/*
	170	* If version mismatch, don't register, but don't trigger assert
	171	* on caller. The version check just prints an error.
	172	*/
	173	if (!check_provider_version(desc))
4e48b5d2	174	return NULL;
5b4c6da4	175	if (!check_event_provider(desc))
4e48b5d2	176	return NULL;
71d31690	177
3327ac33	178	ust_lock_nocheck();
6715d7d1	179
4e48b5d2 MD	180	reg_probe = zmalloc(sizeof(struct lttng_ust_registered_probe));
	181	if (!reg_probe)
	182	goto end;
	183	reg_probe->desc = desc;
	184	cds_list_add(&reg_probe->lazy_init_head, &lazy_probe_init);
	185	reg_probe->lazy = 1;
	186
6715d7d1	187	DBG("adding probe %s containing %u events to lazy registration list",
5b4c6da4	188	desc->provider_name, desc->nr_events);
6715d7d1 MD	189	/*
	190	* If there is at least one active session, we need to register
	191	* the probe immediately, since we cannot delay event
	192	* registration because they are needed ASAP.
	193	*/
	194	if (lttng_session_active())
	195	fixup_lazy_probes();
0fdd0b89	196
d8d2416d	197	lttng_fix_pending_event_notifiers();
4e48b5d2	198	end:
17dfb34b	199	ust_unlock();
4e48b5d2	200	return reg_probe;
ce5aef0b	201	}
ce5aef0b	202
4e48b5d2	203	void lttng_ust_probe_unregister(struct lttng_ust_registered_probe *reg_probe)
ce5aef0b	204	{
a9fd951a	205	lttng_ust_alloc_tls();
c362addf	206
4e48b5d2 MD	207	if (!reg_probe)
	208	return;
	209	if (!check_provider_version(reg_probe->desc))
71d31690 MD	210	return;
71d31690 MD	211
3327ac33	212	ust_lock_nocheck();
4e48b5d2 MD	213	if (!reg_probe->lazy)
4e48b5d2 MD	214	cds_list_del(&reg_probe->head);
6715d7d1	215	else
4e48b5d2	216	cds_list_del(&reg_probe->lazy_init_head);
2c05c691	217
4e48b5d2 MD	218	lttng_probe_provider_unregister_events(reg_probe->desc);
4e48b5d2 MD	219	DBG("just unregistered probes of provider %s", reg_probe->desc->provider_name);
17dfb34b	220	ust_unlock();
4e48b5d2	221	free(reg_probe);
ce5aef0b	222	}
ce5aef0b	223
7dd08bec	224	void lttng_probes_prune_event_list(struct lttng_ust_tracepoint_list *list)
c8fcf224 MD	225	{
	226	struct tp_list_entry list_entry, tmp;
	227
	228	cds_list_for_each_entry_safe(list_entry, tmp, &list->head, head) {
	229	cds_list_del(&list_entry->head);
	230	free(list_entry);
	231	}
	232	}
	233
	234	/*
	235	* called with UST lock held.
	236	*/
7dd08bec	237	int lttng_probes_get_event_list(struct lttng_ust_tracepoint_list *list)
c8fcf224	238	{
4e48b5d2	239	struct lttng_ust_registered_probe *reg_probe;
ac69b35b	240	struct cds_list_head *probe_list;
4e48b5d2	241	int i;
c8fcf224	242
ac69b35b	243	probe_list = lttng_get_probe_list_head();
c8fcf224	244	CDS_INIT_LIST_HEAD(&list->head);
4e48b5d2 MD	245	cds_list_for_each_entry(reg_probe, probe_list, head) {
	246	const struct lttng_ust_probe_desc *probe_desc = reg_probe->desc;
	247
c8fcf224	248	for (i = 0; i < probe_desc->nr_events; i++) {
5b4c6da4 MD	249	const struct lttng_ust_event_desc *event_desc =
5b4c6da4 MD	250	probe_desc->event_desc[i];
c8fcf224 MD	251	struct tp_list_entry *list_entry;
c8fcf224 MD	252
5b4c6da4 MD	253	/* Skip event if name is too long. */
	254	if (!lttng_ust_validate_event_name(event_desc))
	255	continue;
c8fcf224 MD	256	list_entry = zmalloc(sizeof(*list_entry));
	257	if (!list_entry)
	258	goto err_nomem;
	259	cds_list_add(&list_entry->head, &list->head);
5b4c6da4 MD	260	lttng_ust_format_event_name(event_desc, list_entry->tp.name);
5b4c6da4 MD	261	if (!event_desc->loglevel) {
612e9ce4	262	list_entry->tp.loglevel = LTTNG_UST_TRACEPOINT_LOGLEVEL_DEFAULT;
c8fcf224	263	} else {
5b4c6da4	264	list_entry->tp.loglevel = (event_desc->loglevel);
c8fcf224 MD	265	}
	266	}
	267	}
	268	if (cds_list_empty(&list->head))
	269	list->iter = NULL;
	270	else
	271	list->iter =
	272	cds_list_first_entry(&list->head, struct tp_list_entry, head);
	273	return 0;
	274
	275	err_nomem:
7dd08bec	276	lttng_probes_prune_event_list(list);
c8fcf224 MD	277	return -ENOMEM;
	278	}
	279
	280	/*
	281	* Return current iteration position, advance internal iterator to next.
	282	* Return NULL if end of list.
	283	*/
fd17d7ce	284	struct lttng_ust_abi_tracepoint_iter *
c8fcf224 MD	285	lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list)
	286	{
	287	struct tp_list_entry *entry;
	288
	289	if (!list->iter)
	290	return NULL;
	291	entry = list->iter;
	292	if (entry->head.next == &list->head)
	293	list->iter = NULL;
	294	else
	295	list->iter = cds_list_entry(entry->head.next,
	296	struct tp_list_entry, head);
	297	return &entry->tp;
	298	}
1f18504e	299
7dd08bec	300	void lttng_probes_prune_field_list(struct lttng_ust_field_list *list)
06d4f27e MD	301	{
	302	struct tp_field_list_entry list_entry, tmp;
	303
	304	cds_list_for_each_entry_safe(list_entry, tmp, &list->head, head) {
	305	cds_list_del(&list_entry->head);
	306	free(list_entry);
	307	}
	308	}
	309
	310	/*
	311	* called with UST lock held.
	312	*/
7dd08bec	313	int lttng_probes_get_field_list(struct lttng_ust_field_list *list)
06d4f27e	314	{
4e48b5d2	315	struct lttng_ust_registered_probe *reg_probe;
ac69b35b	316	struct cds_list_head *probe_list;
4e48b5d2	317	int i;
06d4f27e	318
ac69b35b	319	probe_list = lttng_get_probe_list_head();
06d4f27e	320	CDS_INIT_LIST_HEAD(&list->head);
4e48b5d2 MD	321	cds_list_for_each_entry(reg_probe, probe_list, head) {
	322	const struct lttng_ust_probe_desc *probe_desc = reg_probe->desc;
	323
06d4f27e	324	for (i = 0; i < probe_desc->nr_events; i++) {
dc11f93f	325	const struct lttng_ust_event_desc *event_desc =
06d4f27e MD	326	probe_desc->event_desc[i];
	327	int j;
	328
26329f26 MD	329	if (event_desc->nr_fields == 0) {
	330	/* Events without fields. */
	331	struct tp_field_list_entry *list_entry;
	332
5b4c6da4 MD	333	/* Skip event if name is too long. */
	334	if (!lttng_ust_validate_event_name(event_desc))
	335	continue;
26329f26 MD	336	list_entry = zmalloc(sizeof(*list_entry));
	337	if (!list_entry)
	338	goto err_nomem;
	339	cds_list_add(&list_entry->head, &list->head);
5b4c6da4	340	lttng_ust_format_event_name(event_desc, list_entry->field.event_name);
26329f26	341	list_entry->field.field_name[0] = '\0';
fd17d7ce	342	list_entry->field.type = LTTNG_UST_ABI_FIELD_OTHER;
26329f26	343	if (!event_desc->loglevel) {
612e9ce4	344	list_entry->field.loglevel = LTTNG_UST_TRACEPOINT_LOGLEVEL_DEFAULT;
26329f26 MD	345	} else {
	346	list_entry->field.loglevel = (event_desc->loglevel);
	347	}
	348	list_entry->field.nowrite = 1;
	349	}
	350
06d4f27e	351	for (j = 0; j < event_desc->nr_fields; j++) {
25cff019 MD	352	const struct lttng_ust_event_field *event_field =
25cff019 MD	353	event_desc->fields[j];
06d4f27e MD	354	struct tp_field_list_entry *list_entry;
06d4f27e MD	355
5b4c6da4 MD	356	/* Skip event if name is too long. */
	357	if (!lttng_ust_validate_event_name(event_desc))
	358	continue;
06d4f27e MD	359	list_entry = zmalloc(sizeof(*list_entry));
	360	if (!list_entry)
	361	goto err_nomem;
	362	cds_list_add(&list_entry->head, &list->head);
5b4c6da4	363	lttng_ust_format_event_name(event_desc, list_entry->field.event_name);
06d4f27e MD	364	strncpy(list_entry->field.field_name,
06d4f27e MD	365	event_field->name,
fd17d7ce MD	366	LTTNG_UST_ABI_SYM_NAME_LEN);
fd17d7ce MD	367	list_entry->field.field_name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
a084756d MD	368	switch (event_field->type->type) {
a084756d MD	369	case lttng_ust_type_integer:
fd17d7ce	370	list_entry->field.type = LTTNG_UST_ABI_FIELD_INTEGER;
40003310	371	break;
a084756d	372	case lttng_ust_type_string:
fd17d7ce	373	list_entry->field.type = LTTNG_UST_ABI_FIELD_STRING;
40003310	374	break;
a084756d MD	375	case lttng_ust_type_array:
a084756d MD	376	if (lttng_ust_get_type_array(event_field->type)->encoding == lttng_ust_string_encoding_none)
fd17d7ce	377	list_entry->field.type = LTTNG_UST_ABI_FIELD_OTHER;
40003310	378	else
fd17d7ce	379	list_entry->field.type = LTTNG_UST_ABI_FIELD_STRING;
40003310	380	break;
a084756d MD	381	case lttng_ust_type_sequence:
a084756d MD	382	if (lttng_ust_get_type_sequence(event_field->type)->encoding == lttng_ust_string_encoding_none)
fd17d7ce	383	list_entry->field.type = LTTNG_UST_ABI_FIELD_OTHER;
40003310	384	else
fd17d7ce	385	list_entry->field.type = LTTNG_UST_ABI_FIELD_STRING;
40003310	386	break;
a084756d	387	case lttng_ust_type_float:
fd17d7ce	388	list_entry->field.type = LTTNG_UST_ABI_FIELD_FLOAT;
40003310	389	break;
a084756d	390	case lttng_ust_type_enum:
fd17d7ce	391	list_entry->field.type = LTTNG_UST_ABI_FIELD_ENUM;
40003310 MD	392	break;
40003310 MD	393	default:
fd17d7ce	394	list_entry->field.type = LTTNG_UST_ABI_FIELD_OTHER;
40003310	395	}
06d4f27e	396	if (!event_desc->loglevel) {
612e9ce4	397	list_entry->field.loglevel = LTTNG_UST_TRACEPOINT_LOGLEVEL_DEFAULT;
06d4f27e MD	398	} else {
	399	list_entry->field.loglevel = (event_desc->loglevel);
	400	}
180901e6	401	list_entry->field.nowrite = event_field->nowrite;
06d4f27e MD	402	}
	403	}
	404	}
	405	if (cds_list_empty(&list->head))
	406	list->iter = NULL;
	407	else
	408	list->iter =
	409	cds_list_first_entry(&list->head,
	410	struct tp_field_list_entry, head);
	411	return 0;
	412
	413	err_nomem:
7dd08bec	414	lttng_probes_prune_field_list(list);
06d4f27e MD	415	return -ENOMEM;
	416	}
	417
	418	/*
	419	* Return current iteration position, advance internal iterator to next.
	420	* Return NULL if end of list.
	421	*/
fd17d7ce	422	struct lttng_ust_abi_field_iter *
06d4f27e MD	423	lttng_ust_field_list_get_iter_next(struct lttng_ust_field_list *list)
	424	{
	425	struct tp_field_list_entry *entry;
	426
	427	if (!list->iter)
	428	return NULL;
	429	entry = list->iter;
	430	if (entry->head.next == &list->head)
	431	list->iter = NULL;
	432	else
	433	list->iter = cds_list_entry(entry->head.next,
	434	struct tp_field_list_entry, head);
	435	return &entry->field;
	436	}