[lttng-tools.git] / src / bin / lttng-sessiond / ust-registry.h

/*
 * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License, version 2 only, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef LTTNG_UST_REGISTRY_H
#define LTTNG_UST_REGISTRY_H

#include <pthread.h>
#include <stdint.h>

#include <common/hashtable/hashtable.h>
#include <common/compat/uuid.h>

#include "ust-ctl.h"

#define CTF_SPEC_MAJOR	1
#define CTF_SPEC_MINOR	8

struct ust_app;

struct ust_registry_session {
	/*
	 * With multiple writers and readers, use this lock to access
	 * the registry. Can nest within the ust app session lock.
	 * Also acts as a registry serialization lock. Used by registry
	 * readers to serialize the registry information sent from the
	 * sessiond to the consumerd.
	 * The consumer socket lock nests within this lock.
	 */
	pthread_mutex_t lock;
	/* Next channel ID available for a newly registered channel. */
	uint32_t next_channel_id;
	/* Once this value reaches UINT32_MAX, no more id can be allocated. */
	uint32_t used_channel_id;
	/* Next enumeration ID available. */
	uint64_t next_enum_id;
	/* Universal unique identifier used by the tracer. */
	unsigned char uuid[UUID_LEN];

	/* session ABI description */

	/* Size of long, in bits */
	unsigned int bits_per_long;
	/* Alignment, in bits */
	unsigned int uint8_t_alignment,
		uint16_t_alignment,
		uint32_t_alignment,
		uint64_t_alignment,
		long_alignment;
	/* endianness */
	int byte_order;	/* BIG_ENDIAN or LITTLE_ENDIAN */

	/* Generated metadata. */
	char *metadata;		/* NOT null-terminated ! Use memcpy. */
	size_t metadata_len, metadata_alloc_len;
	/* Length of bytes sent to the consumer. */
	size_t metadata_len_sent;
	/* Current version of the metadata. */
	uint64_t metadata_version;

	char root_shm_path[PATH_MAX];
	char shm_path[PATH_MAX];
	char metadata_path[PATH_MAX];
	int metadata_fd;	/* file-backed metadata FD */

	/*
	 * Hash table containing channels sent by the UST tracer. MUST
	 * be accessed with a RCU read side lock acquired.
	 */
	struct lttng_ht *channels;
	/*
	 * Unique key to identify the metadata on the consumer side.
	 */
	uint64_t metadata_key;
	/*
	 * Indicates if the metadata is closed on the consumer side. This is to
	 * avoid double close of metadata when an application unregisters AND
	 * deletes its sessions.
	 */
	unsigned int metadata_closed;

	/* User and group owning the session. */
	uid_t uid;
	gid_t gid;

	/* Enumerations table. */
	struct lttng_ht *enums;

	/*
	 * Copy of the tracer version when the first app is registered.
	 * It is used if we need to regenerate the metadata.
	 */
	uint32_t major;
	uint32_t minor;
};

struct ust_registry_channel {
	uint64_t key;
	uint64_t consumer_key;
	/* Id set when replying to a register channel. */
	uint32_t chan_id;
	enum ustctl_channel_header header_type;

	/*
	 * Flag for this channel if the metadata was dumped once during
	 * registration. 0 means no, 1 yes.
	 */
	unsigned int metadata_dumped;
	/* Indicates if this channel registry has already been registered. */
	unsigned int register_done;

	/*
	 * Hash table containing events sent by the UST tracer. MUST be accessed
	 * with a RCU read side lock acquired.
	 */
	struct lttng_ht *ht;
	/* Next event ID available for a newly registered event. */
	uint32_t next_event_id;
	/* Once this value reaches UINT32_MAX, no more id can be allocated. */
	uint32_t used_event_id;
	/*
	 * Context fields of the registry. Context are per channel. Allocated by a
	 * register channel notification from the UST tracer.
	 */
	size_t nr_ctx_fields;
	struct ustctl_field *ctx_fields;
	struct lttng_ht_node_u64 node;
	/* For delayed reclaim */
	struct rcu_head rcu_head;
};

/*
 * Event registered from a UST tracer sent to the session daemon. This is
 * indexed and matched by <event_name/signature>.
 */
struct ust_registry_event {
	int id;
	/* Both objd are set by the tracer. */
	int session_objd;
	int channel_objd;
	/* Name of the event returned by the tracer. */
	char name[LTTNG_UST_SYM_NAME_LEN];
	char *signature;
	int loglevel_value;
	size_t nr_fields;
	struct ustctl_field *fields;
	char *model_emf_uri;
	/*
	 * Flag for this channel if the metadata was dumped once during
	 * registration. 0 means no, 1 yes.
	 */
	unsigned int metadata_dumped;
	/*
	 * Node in the ust-registry hash table. The event name is used to
	 * initialize the node and the event_name/signature for the match function.
	 */
	struct lttng_ht_node_u64 node;
};

struct ust_registry_enum {
	char name[LTTNG_UST_SYM_NAME_LEN];
	struct ustctl_enum_entry *entries;
	size_t nr_entries;
	uint64_t id;	/* enum id in session */
	/* Enumeration node in session hash table. */
	struct lttng_ht_node_str node;
	/* For delayed reclaim. */
	struct rcu_head rcu_head;
};

/*
 * Validate that the id has reached the maximum allowed or not.
 *
 * Return 0 if NOT else 1.
 */
static inline int ust_registry_is_max_id(uint32_t id)
{
	return (id == UINT32_MAX) ? 1 : 0;
}

/*
 * Return next available event id and increment the used counter. The
 * ust_registry_is_max_id function MUST be called before in order to validate
 * if the maximum number of IDs have been reached. If not, it is safe to call
 * this function.
 *
 * Return a unique channel ID. If max is reached, the used_event_id counter is
 * returned.
 */
static inline uint32_t ust_registry_get_next_event_id(
		struct ust_registry_channel *r)
{
	if (ust_registry_is_max_id(r->used_event_id)) {
		return r->used_event_id;
	}

	r->used_event_id++;
	return r->next_event_id++;
}

/*
 * Return next available channel id and increment the used counter. The
 * ust_registry_is_max_id function MUST be called before in order to validate
 * if the maximum number of IDs have been reached. If not, it is safe to call
 * this function.
 *
 * Return a unique channel ID. If max is reached, the used_channel_id counter
 * is returned.
 */
static inline uint32_t ust_registry_get_next_chan_id(
		struct ust_registry_session *r)
{
	if (ust_registry_is_max_id(r->used_channel_id)) {
		return r->used_channel_id;
	}

	r->used_channel_id++;
	return r->next_channel_id++;
}

/*
 * Return registry event count. This is read atomically.
 */
static inline uint32_t ust_registry_get_event_count(
		struct ust_registry_channel *r)
{
	return (uint32_t) uatomic_read(&r->used_event_id);
}

#ifdef HAVE_LIBLTTNG_UST_CTL

void ust_registry_channel_destroy(struct ust_registry_session *session,
		struct ust_registry_channel *chan);
struct ust_registry_channel *ust_registry_channel_find(
		struct ust_registry_session *session, uint64_t key);
int ust_registry_channel_add(struct ust_registry_session *session,
		uint64_t key);
void ust_registry_channel_del_free(struct ust_registry_session *session,
		uint64_t key, bool notif);

int ust_registry_session_init(struct ust_registry_session **sessionp,
		struct ust_app *app,
		uint32_t bits_per_long,
		uint32_t uint8_t_alignment,
		uint32_t uint16_t_alignment,
		uint32_t uint32_t_alignment,
		uint32_t uint64_t_alignment,
		uint32_t long_alignment,
		int byte_order,
		uint32_t major,
		uint32_t minor,
		const char *root_shm_path,
		const char *shm_path,
		uid_t euid,
		gid_t egid);
void ust_registry_session_destroy(struct ust_registry_session *session);

int ust_registry_create_event(struct ust_registry_session *session,
		uint64_t chan_key, int session_objd, int channel_objd, char *name,
		char *sig, size_t nr_fields, struct ustctl_field *fields,
		int loglevel_value, char *model_emf_uri, int buffer_type,
		uint32_t *event_id_p, struct ust_app *app);
struct ust_registry_event *ust_registry_find_event(
		struct ust_registry_channel *chan, char *name, char *sig);
void ust_registry_destroy_event(struct ust_registry_channel *chan,
		struct ust_registry_event *event);

/* app can be NULL for registry shared across applications. */
int ust_metadata_session_statedump(struct ust_registry_session *session,
		struct ust_app *app, uint32_t major, uint32_t minor);
int ust_metadata_channel_statedump(struct ust_registry_session *session,
		struct ust_registry_channel *chan);
int ust_metadata_event_statedump(struct ust_registry_session *session,
		struct ust_registry_channel *chan,
		struct ust_registry_event *event);
int ust_registry_create_or_find_enum(struct ust_registry_session *session,
		int session_objd, char *name,
		struct ustctl_enum_entry *entries, size_t nr_entries,
		uint64_t *enum_id);
struct ust_registry_enum *
	ust_registry_lookup_enum_by_id(struct ust_registry_session *session,
		const char *name, uint64_t id);

#else /* HAVE_LIBLTTNG_UST_CTL */

static inline
void ust_registry_channel_destroy(struct ust_registry_session *session,
		struct ust_registry_channel *chan)
{}
static inline
struct ust_registry_channel *ust_registry_channel_find(
		struct ust_registry_session *session, uint64_t key)
{
	return NULL;
}
static inline
int ust_registry_channel_add(struct ust_registry_session *session,
		uint64_t key)
{
	return 0;
}
static inline
void ust_registry_channel_del_free(struct ust_registry_session *session,
		uint64_t key, bool notif)
{}
static inline
int ust_registry_session_init(struct ust_registry_session **sessionp,
		struct ust_app *app,
		uint32_t bits_per_long,
		uint32_t uint8_t_alignment,
		uint32_t uint16_t_alignment,
		uint32_t uint32_t_alignment,
		uint32_t uint64_t_alignment,
		uint32_t long_alignment,
		int byte_order)
{
	return 0;
}
static inline
void ust_registry_session_destroy(struct ust_registry_session *session)
{}
static inline
int ust_registry_create_event(struct ust_registry_session *session,
		uint64_t chan_key, int session_objd, int channel_objd, char *name,
		char *sig, size_t nr_fields, struct ustctl_field *fields,
		int loglevel_value, char *model_emf_uri, int buffer_type,
		uint32_t *event_id_p)
{
	return 0;
}
static inline
struct ust_registry_event *ust_registry_find_event(
		struct ust_registry_channel *chan, char *name, char *sig)
{
	return NULL;
}
static inline
void ust_registry_destroy_event(struct ust_registry_channel *chan,
		struct ust_registry_event *event)
{}

/* The app object can be NULL for registry shared across applications. */
static inline
int ust_metadata_session_statedump(struct ust_registry_session *session,
		struct ust_app *app, uint32_t major, uint32_t minor)
{
	return 0;
}
static inline
int ust_metadata_channel_statedump(struct ust_registry_session *session,
		struct ust_registry_channel *chan)
{
	return 0;
}
static inline
int ust_metadata_event_statedump(struct ust_registry_session *session,
		struct ust_registry_channel *chan,
		struct ust_registry_event *event)
{
	return 0;
}
static inline
int ust_registry_create_or_find_enum(struct ust_registry_session *session,
		int session_objd, char *name,
		struct ustctl_enum_entry *entries, size_t nr_entries,
		uint64_t *enum_id)
{
	return 0;
}
static inline
struct ust_registry_enum *
	ust_registry_lookup_enum_by_id(struct ust_registry_session *session,
		const char *name, uint64_t id)
{
	return NULL;
}

#endif /* HAVE_LIBLTTNG_UST_CTL */

#endif /* LTTNG_UST_REGISTRY_H */
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU General Public License, version 2 only, as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc., 51
	15	* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	16	*/
	17
	18	#ifndef LTTNG_UST_REGISTRY_H
	19	#define LTTNG_UST_REGISTRY_H
	20
	21	#include <pthread.h>
	22	#include <stdint.h>
	23
	24	#include <common/hashtable/hashtable.h>
	25	#include <common/compat/uuid.h>
	26
	27	#include "ust-ctl.h"
	28
	29	#define CTF_SPEC_MAJOR 1
	30	#define CTF_SPEC_MINOR 8
	31
	32	struct ust_app;
	33
	34	struct ust_registry_session {
	35	/*
	36	* With multiple writers and readers, use this lock to access
	37	* the registry. Can nest within the ust app session lock.
	38	* Also acts as a registry serialization lock. Used by registry
	39	* readers to serialize the registry information sent from the
	40	* sessiond to the consumerd.
	41	* The consumer socket lock nests within this lock.
	42	*/
	43	pthread_mutex_t lock;
	44	/* Next channel ID available for a newly registered channel. */
	45	uint32_t next_channel_id;
	46	/* Once this value reaches UINT32_MAX, no more id can be allocated. */
	47	uint32_t used_channel_id;
	48	/* Next enumeration ID available. */
	49	uint64_t next_enum_id;
	50	/* Universal unique identifier used by the tracer. */
	51	unsigned char uuid[UUID_LEN];
	52
	53	/* session ABI description */
	54
	55	/* Size of long, in bits */
	56	unsigned int bits_per_long;
	57	/* Alignment, in bits */
	58	unsigned int uint8_t_alignment,
	59	uint16_t_alignment,
	60	uint32_t_alignment,
	61	uint64_t_alignment,
	62	long_alignment;
	63	/* endianness */
	64	int byte_order; /* BIG_ENDIAN or LITTLE_ENDIAN */
	65
	66	/* Generated metadata. */
	67	char metadata; / NOT null-terminated ! Use memcpy. */
	68	size_t metadata_len, metadata_alloc_len;
	69	/* Length of bytes sent to the consumer. */
	70	size_t metadata_len_sent;
	71	/* Current version of the metadata. */
	72	uint64_t metadata_version;
	73
	74	char root_shm_path[PATH_MAX];
	75	char shm_path[PATH_MAX];
	76	char metadata_path[PATH_MAX];
	77	int metadata_fd; /* file-backed metadata FD */
	78
	79	/*
	80	* Hash table containing channels sent by the UST tracer. MUST
	81	* be accessed with a RCU read side lock acquired.
	82	*/
	83	struct lttng_ht *channels;
	84	/*
	85	* Unique key to identify the metadata on the consumer side.
	86	*/
	87	uint64_t metadata_key;
	88	/*
	89	* Indicates if the metadata is closed on the consumer side. This is to
	90	* avoid double close of metadata when an application unregisters AND
	91	* deletes its sessions.
	92	*/
	93	unsigned int metadata_closed;
	94
	95	/* User and group owning the session. */
	96	uid_t uid;
	97	gid_t gid;
	98
	99	/* Enumerations table. */
	100	struct lttng_ht *enums;
	101
	102	/*
	103	* Copy of the tracer version when the first app is registered.
	104	* It is used if we need to regenerate the metadata.
	105	*/
	106	uint32_t major;
	107	uint32_t minor;
	108	};
	109
	110	struct ust_registry_channel {
	111	uint64_t key;
	112	uint64_t consumer_key;
	113	/* Id set when replying to a register channel. */
	114	uint32_t chan_id;
	115	enum ustctl_channel_header header_type;
	116
	117	/*
	118	* Flag for this channel if the metadata was dumped once during
	119	* registration. 0 means no, 1 yes.
	120	*/
	121	unsigned int metadata_dumped;
	122	/* Indicates if this channel registry has already been registered. */
	123	unsigned int register_done;
	124
	125	/*
	126	* Hash table containing events sent by the UST tracer. MUST be accessed
	127	* with a RCU read side lock acquired.
	128	*/
	129	struct lttng_ht *ht;
	130	/* Next event ID available for a newly registered event. */
	131	uint32_t next_event_id;
	132	/* Once this value reaches UINT32_MAX, no more id can be allocated. */
	133	uint32_t used_event_id;
	134	/*
	135	* Context fields of the registry. Context are per channel. Allocated by a
	136	* register channel notification from the UST tracer.
	137	*/
	138	size_t nr_ctx_fields;
	139	struct ustctl_field *ctx_fields;
	140	struct lttng_ht_node_u64 node;
	141	/* For delayed reclaim */
	142	struct rcu_head rcu_head;
	143	};
	144
	145	/*
	146	* Event registered from a UST tracer sent to the session daemon. This is
	147	* indexed and matched by <event_name/signature>.
	148	*/
	149	struct ust_registry_event {
	150	int id;
	151	/* Both objd are set by the tracer. */
	152	int session_objd;
	153	int channel_objd;
	154	/* Name of the event returned by the tracer. */
	155	char name[LTTNG_UST_SYM_NAME_LEN];
	156	char *signature;
	157	int loglevel_value;
	158	size_t nr_fields;
	159	struct ustctl_field *fields;
	160	char *model_emf_uri;
	161	/*
	162	* Flag for this channel if the metadata was dumped once during
	163	* registration. 0 means no, 1 yes.
	164	*/
	165	unsigned int metadata_dumped;
	166	/*
	167	* Node in the ust-registry hash table. The event name is used to
	168	* initialize the node and the event_name/signature for the match function.
	169	*/
	170	struct lttng_ht_node_u64 node;
	171	};
	172
	173	struct ust_registry_enum {
	174	char name[LTTNG_UST_SYM_NAME_LEN];
	175	struct ustctl_enum_entry *entries;
	176	size_t nr_entries;
	177	uint64_t id; /* enum id in session */
	178	/* Enumeration node in session hash table. */
	179	struct lttng_ht_node_str node;
	180	/* For delayed reclaim. */
	181	struct rcu_head rcu_head;
	182	};
	183
	184	/*
	185	* Validate that the id has reached the maximum allowed or not.
	186	*
	187	* Return 0 if NOT else 1.
	188	*/
	189	static inline int ust_registry_is_max_id(uint32_t id)
	190	{
	191	return (id == UINT32_MAX) ? 1 : 0;
	192	}
	193
	194	/*
	195	* Return next available event id and increment the used counter. The
	196	* ust_registry_is_max_id function MUST be called before in order to validate
	197	* if the maximum number of IDs have been reached. If not, it is safe to call
	198	* this function.
	199	*
	200	* Return a unique channel ID. If max is reached, the used_event_id counter is
	201	* returned.
	202	*/
	203	static inline uint32_t ust_registry_get_next_event_id(
	204	struct ust_registry_channel *r)
	205	{
	206	if (ust_registry_is_max_id(r->used_event_id)) {
	207	return r->used_event_id;
	208	}
	209
	210	r->used_event_id++;
	211	return r->next_event_id++;
	212	}
	213
	214	/*
	215	* Return next available channel id and increment the used counter. The
	216	* ust_registry_is_max_id function MUST be called before in order to validate
	217	* if the maximum number of IDs have been reached. If not, it is safe to call
	218	* this function.
	219	*
	220	* Return a unique channel ID. If max is reached, the used_channel_id counter
	221	* is returned.
	222	*/
	223	static inline uint32_t ust_registry_get_next_chan_id(
	224	struct ust_registry_session *r)
	225	{
	226	if (ust_registry_is_max_id(r->used_channel_id)) {
	227	return r->used_channel_id;
	228	}
	229
	230	r->used_channel_id++;
	231	return r->next_channel_id++;
	232	}
	233
	234	/*
	235	* Return registry event count. This is read atomically.
	236	*/
	237	static inline uint32_t ust_registry_get_event_count(
	238	struct ust_registry_channel *r)
	239	{
	240	return (uint32_t) uatomic_read(&r->used_event_id);
	241	}
	242
	243	#ifdef HAVE_LIBLTTNG_UST_CTL
	244
	245	void ust_registry_channel_destroy(struct ust_registry_session *session,
	246	struct ust_registry_channel *chan);
	247	struct ust_registry_channel *ust_registry_channel_find(
	248	struct ust_registry_session *session, uint64_t key);
	249	int ust_registry_channel_add(struct ust_registry_session *session,
	250	uint64_t key);
	251	void ust_registry_channel_del_free(struct ust_registry_session *session,
	252	uint64_t key, bool notif);
	253
	254	int ust_registry_session_init(struct ust_registry_session **sessionp,
	255	struct ust_app *app,
	256	uint32_t bits_per_long,
	257	uint32_t uint8_t_alignment,
	258	uint32_t uint16_t_alignment,
	259	uint32_t uint32_t_alignment,
	260	uint32_t uint64_t_alignment,
	261	uint32_t long_alignment,
	262	int byte_order,
	263	uint32_t major,
	264	uint32_t minor,
	265	const char *root_shm_path,
	266	const char *shm_path,
	267	uid_t euid,
	268	gid_t egid);
	269	void ust_registry_session_destroy(struct ust_registry_session *session);
	270
	271	int ust_registry_create_event(struct ust_registry_session *session,
	272	uint64_t chan_key, int session_objd, int channel_objd, char *name,
	273	char sig, size_t nr_fields, struct ustctl_field fields,
	274	int loglevel_value, char *model_emf_uri, int buffer_type,
	275	uint32_t event_id_p, struct ust_app app);
	276	struct ust_registry_event *ust_registry_find_event(
	277	struct ust_registry_channel chan, char name, char *sig);
	278	void ust_registry_destroy_event(struct ust_registry_channel *chan,
	279	struct ust_registry_event *event);
	280
	281	/* app can be NULL for registry shared across applications. */
	282	int ust_metadata_session_statedump(struct ust_registry_session *session,
	283	struct ust_app *app, uint32_t major, uint32_t minor);
	284	int ust_metadata_channel_statedump(struct ust_registry_session *session,
	285	struct ust_registry_channel *chan);
	286	int ust_metadata_event_statedump(struct ust_registry_session *session,
	287	struct ust_registry_channel *chan,
	288	struct ust_registry_event *event);
	289	int ust_registry_create_or_find_enum(struct ust_registry_session *session,
	290	int session_objd, char *name,
	291	struct ustctl_enum_entry *entries, size_t nr_entries,
	292	uint64_t *enum_id);
	293	struct ust_registry_enum *
	294	ust_registry_lookup_enum_by_id(struct ust_registry_session *session,
	295	const char *name, uint64_t id);
	296
	297	#else /* HAVE_LIBLTTNG_UST_CTL */
	298
	299	static inline
	300	void ust_registry_channel_destroy(struct ust_registry_session *session,
	301	struct ust_registry_channel *chan)
	302	{}
	303	static inline
	304	struct ust_registry_channel *ust_registry_channel_find(
	305	struct ust_registry_session *session, uint64_t key)
	306	{
	307	return NULL;
	308	}
	309	static inline
	310	int ust_registry_channel_add(struct ust_registry_session *session,
	311	uint64_t key)
	312	{
	313	return 0;
	314	}
	315	static inline
	316	void ust_registry_channel_del_free(struct ust_registry_session *session,
	317	uint64_t key, bool notif)
	318	{}
	319	static inline
	320	int ust_registry_session_init(struct ust_registry_session **sessionp,
	321	struct ust_app *app,
	322	uint32_t bits_per_long,
	323	uint32_t uint8_t_alignment,
	324	uint32_t uint16_t_alignment,
	325	uint32_t uint32_t_alignment,
	326	uint32_t uint64_t_alignment,
	327	uint32_t long_alignment,
	328	int byte_order)
	329	{
	330	return 0;
	331	}
	332	static inline
	333	void ust_registry_session_destroy(struct ust_registry_session *session)
	334	{}
	335	static inline
	336	int ust_registry_create_event(struct ust_registry_session *session,
	337	uint64_t chan_key, int session_objd, int channel_objd, char *name,
	338	char sig, size_t nr_fields, struct ustctl_field fields,
	339	int loglevel_value, char *model_emf_uri, int buffer_type,
	340	uint32_t *event_id_p)
	341	{
	342	return 0;
	343	}
	344	static inline
	345	struct ust_registry_event *ust_registry_find_event(
	346	struct ust_registry_channel chan, char name, char *sig)
	347	{
	348	return NULL;
	349	}
	350	static inline
	351	void ust_registry_destroy_event(struct ust_registry_channel *chan,
	352	struct ust_registry_event *event)
	353	{}
	354
	355	/* The app object can be NULL for registry shared across applications. */
	356	static inline
	357	int ust_metadata_session_statedump(struct ust_registry_session *session,
	358	struct ust_app *app, uint32_t major, uint32_t minor)
	359	{
	360	return 0;
	361	}
	362	static inline
	363	int ust_metadata_channel_statedump(struct ust_registry_session *session,
	364	struct ust_registry_channel *chan)
	365	{
	366	return 0;
	367	}
	368	static inline
	369	int ust_metadata_event_statedump(struct ust_registry_session *session,
	370	struct ust_registry_channel *chan,
	371	struct ust_registry_event *event)
	372	{
	373	return 0;
	374	}
	375	static inline
	376	int ust_registry_create_or_find_enum(struct ust_registry_session *session,
	377	int session_objd, char *name,
	378	struct ustctl_enum_entry *entries, size_t nr_entries,
	379	uint64_t *enum_id)
	380	{
	381	return 0;
	382	}
	383	static inline
	384	struct ust_registry_enum *
	385	ust_registry_lookup_enum_by_id(struct ust_registry_session *session,
	386	const char *name, uint64_t id)
	387	{
	388	return NULL;
	389	}
	390
	391	#endif /* HAVE_LIBLTTNG_UST_CTL */
	392
	393	#endif /* LTTNG_UST_REGISTRY_H */