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

/*
 * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 */

#ifndef LTTNG_UST_REGISTRY_H
#define LTTNG_UST_REGISTRY_H

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

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

#include "lttng-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[LTTNG_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;

	/*
	 * Those fields are only used when a session is created with
	 * the --shm-path option. In this case, the metadata is output
	 * twice: once to the consumer, as ususal, but a second time
	 * also in the shm path directly. This is done so that a copy
	 * of the metadata that is as fresh as possible is available
	 * on the event of a crash.
	 *
	 * root_shm_path contains the shm-path provided by the user, along with
	 * the session's name and timestamp:
	 *   e.g. /tmp/my_shm/my_session-20180612-135822
	 *
	 * shm_path contains the full path of the memory buffers:
	 *   e.g. /tmp/my_shm/my_session-20180612-135822/ust/uid/1000/64-bit
	 *
	 * metadata_path contains the full path to the metadata file that
	 * is kept for the "crash buffer" extraction:
	 *  e.g. /tmp/my_shm/my_session-20180612-135822/ust/uid/1000/64-bit/metadata
	 *
	 * Note that this is not the trace's final metadata file. It is
	 * only meant to be used to read the contents of the ring buffers
	 * in the event of a crash.
	 *
	 * metadata_fd is a file descriptor that points to the file at
	 * 'metadata_path'.
	 */
	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;

	/* The id of the parent session */
	uint64_t tracing_id;
	uid_t tracing_uid;
};

struct ust_registry_channel {
	uint64_t key;
	uint64_t consumer_key;
	/* Id set when replying to a register channel. */
	uint32_t chan_id;
	enum lttng_ust_ctl_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 lttng_ust_ctl_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_ABI_SYM_NAME_LEN];
	char *signature;
	int loglevel_value;
	size_t nr_fields;
	struct lttng_ust_ctl_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_ABI_SYM_NAME_LEN];
	struct lttng_ust_ctl_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,
		uint64_t tracing_id,
		uid_t tracing_uid);
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 lttng_ust_ctl_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 lttng_ust_ctl_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,
		uint32_t major,
		uint32_t minor,
		const char *root_shm_path,
		const char *shm_path,
		uid_t euid,
		gid_t egid,
		uint64_t tracing_id,
		uid_t tracing_uid)
{
	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 lttng_ust_ctl_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 lttng_ust_ctl_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	* SPDX-License-Identifier: GPL-2.0-only
	5	*
	6	*/
	7
	8	#ifndef LTTNG_UST_REGISTRY_H
	9	#define LTTNG_UST_REGISTRY_H
	10
	11	#include <pthread.h>
	12	#include <stdint.h>
	13
	14	#include <common/hashtable/hashtable.h>
	15	#include <common/uuid.h>
	16
	17	#include "lttng-ust-ctl.h"
	18
	19	#define CTF_SPEC_MAJOR 1
	20	#define CTF_SPEC_MINOR 8
	21
	22	struct ust_app;
	23
	24	struct ust_registry_session {
	25	/*
	26	* With multiple writers and readers, use this lock to access
	27	* the registry. Can nest within the ust app session lock.
	28	* Also acts as a registry serialization lock. Used by registry
	29	* readers to serialize the registry information sent from the
	30	* sessiond to the consumerd.
	31	* The consumer socket lock nests within this lock.
	32	*/
	33	pthread_mutex_t lock;
	34	/* Next channel ID available for a newly registered channel. */
	35	uint32_t next_channel_id;
	36	/* Once this value reaches UINT32_MAX, no more id can be allocated. */
	37	uint32_t used_channel_id;
	38	/* Next enumeration ID available. */
	39	uint64_t next_enum_id;
	40	/* Universal unique identifier used by the tracer. */
	41	unsigned char uuid[LTTNG_UUID_LEN];
	42
	43	/* session ABI description */
	44
	45	/* Size of long, in bits */
	46	unsigned int bits_per_long;
	47	/* Alignment, in bits */
	48	unsigned int uint8_t_alignment,
	49	uint16_t_alignment,
	50	uint32_t_alignment,
	51	uint64_t_alignment,
	52	long_alignment;
	53	/* endianness */
	54	int byte_order; /* BIG_ENDIAN or LITTLE_ENDIAN */
	55
	56	/* Generated metadata. */
	57	char metadata; / NOT null-terminated ! Use memcpy. */
	58	size_t metadata_len, metadata_alloc_len;
	59	/* Length of bytes sent to the consumer. */
	60	size_t metadata_len_sent;
	61	/* Current version of the metadata. */
	62	uint64_t metadata_version;
	63
	64	/*
	65	* Those fields are only used when a session is created with
	66	* the --shm-path option. In this case, the metadata is output
	67	* twice: once to the consumer, as ususal, but a second time
	68	* also in the shm path directly. This is done so that a copy
	69	* of the metadata that is as fresh as possible is available
	70	* on the event of a crash.
	71	*
	72	* root_shm_path contains the shm-path provided by the user, along with
	73	* the session's name and timestamp:
	74	* e.g. /tmp/my_shm/my_session-20180612-135822
	75	*
	76	* shm_path contains the full path of the memory buffers:
	77	* e.g. /tmp/my_shm/my_session-20180612-135822/ust/uid/1000/64-bit
	78	*
	79	* metadata_path contains the full path to the metadata file that
	80	* is kept for the "crash buffer" extraction:
	81	* e.g. /tmp/my_shm/my_session-20180612-135822/ust/uid/1000/64-bit/metadata
	82	*
	83	* Note that this is not the trace's final metadata file. It is
	84	* only meant to be used to read the contents of the ring buffers
	85	* in the event of a crash.
	86	*
	87	* metadata_fd is a file descriptor that points to the file at
	88	* 'metadata_path'.
	89	*/
	90	char root_shm_path[PATH_MAX];
	91	char shm_path[PATH_MAX];
	92	char metadata_path[PATH_MAX];
	93	int metadata_fd; /* file-backed metadata FD */
	94
	95	/*
	96	* Hash table containing channels sent by the UST tracer. MUST
	97	* be accessed with a RCU read side lock acquired.
	98	*/
	99	struct lttng_ht *channels;
	100	/*
	101	* Unique key to identify the metadata on the consumer side.
	102	*/
	103	uint64_t metadata_key;
	104	/*
	105	* Indicates if the metadata is closed on the consumer side. This is to
	106	* avoid double close of metadata when an application unregisters AND
	107	* deletes its sessions.
	108	*/
	109	unsigned int metadata_closed;
	110
	111	/* User and group owning the session. */
	112	uid_t uid;
	113	gid_t gid;
	114
	115	/* Enumerations table. */
	116	struct lttng_ht *enums;
	117
	118	/*
	119	* Copy of the tracer version when the first app is registered.
	120	* It is used if we need to regenerate the metadata.
	121	*/
	122	uint32_t major;
	123	uint32_t minor;
	124
	125	/* The id of the parent session */
	126	uint64_t tracing_id;
	127	uid_t tracing_uid;
	128	};
	129
	130	struct ust_registry_channel {
	131	uint64_t key;
	132	uint64_t consumer_key;
	133	/* Id set when replying to a register channel. */
	134	uint32_t chan_id;
	135	enum lttng_ust_ctl_channel_header header_type;
	136
	137	/*
	138	* Flag for this channel if the metadata was dumped once during
	139	* registration. 0 means no, 1 yes.
	140	*/
	141	unsigned int metadata_dumped;
	142	/* Indicates if this channel registry has already been registered. */
	143	unsigned int register_done;
	144
	145	/*
	146	* Hash table containing events sent by the UST tracer. MUST be accessed
	147	* with a RCU read side lock acquired.
	148	*/
	149	struct lttng_ht *ht;
	150	/* Next event ID available for a newly registered event. */
	151	uint32_t next_event_id;
	152	/* Once this value reaches UINT32_MAX, no more id can be allocated. */
	153	uint32_t used_event_id;
	154	/*
	155	* Context fields of the registry. Context are per channel. Allocated by a
	156	* register channel notification from the UST tracer.
	157	*/
	158	size_t nr_ctx_fields;
	159	struct lttng_ust_ctl_field *ctx_fields;
	160	struct lttng_ht_node_u64 node;
	161	/* For delayed reclaim */
	162	struct rcu_head rcu_head;
	163	};
	164
	165	/*
	166	* Event registered from a UST tracer sent to the session daemon. This is
	167	* indexed and matched by <event_name/signature>.
	168	*/
	169	struct ust_registry_event {
	170	int id;
	171	/* Both objd are set by the tracer. */
	172	int session_objd;
	173	int channel_objd;
	174	/* Name of the event returned by the tracer. */
	175	char name[LTTNG_UST_ABI_SYM_NAME_LEN];
	176	char *signature;
	177	int loglevel_value;
	178	size_t nr_fields;
	179	struct lttng_ust_ctl_field *fields;
	180	char *model_emf_uri;
	181	/*
	182	* Flag for this channel if the metadata was dumped once during
	183	* registration. 0 means no, 1 yes.
	184	*/
	185	unsigned int metadata_dumped;
	186	/*
	187	* Node in the ust-registry hash table. The event name is used to
	188	* initialize the node and the event_name/signature for the match function.
	189	*/
	190	struct lttng_ht_node_u64 node;
	191	};
	192
	193	struct ust_registry_enum {
	194	char name[LTTNG_UST_ABI_SYM_NAME_LEN];
	195	struct lttng_ust_ctl_enum_entry *entries;
	196	size_t nr_entries;
	197	uint64_t id; /* enum id in session */
	198	/* Enumeration node in session hash table. */
	199	struct lttng_ht_node_str node;
	200	/* For delayed reclaim. */
	201	struct rcu_head rcu_head;
	202	};
	203
	204	/*
	205	* Validate that the id has reached the maximum allowed or not.
	206	*
	207	* Return 0 if NOT else 1.
	208	*/
	209	static inline int ust_registry_is_max_id(uint32_t id)
	210	{
	211	return (id == UINT32_MAX) ? 1 : 0;
	212	}
	213
	214	/*
	215	* Return next available event 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_event_id counter is
	221	* returned.
	222	*/
	223	static inline uint32_t ust_registry_get_next_event_id(
	224	struct ust_registry_channel *r)
	225	{
	226	if (ust_registry_is_max_id(r->used_event_id)) {
	227	return r->used_event_id;
	228	}
	229
	230	r->used_event_id++;
	231	return r->next_event_id++;
	232	}
	233
	234	/*
	235	* Return next available channel id and increment the used counter. The
	236	* ust_registry_is_max_id function MUST be called before in order to validate
	237	* if the maximum number of IDs have been reached. If not, it is safe to call
	238	* this function.
	239	*
	240	* Return a unique channel ID. If max is reached, the used_channel_id counter
	241	* is returned.
	242	*/
	243	static inline uint32_t ust_registry_get_next_chan_id(
	244	struct ust_registry_session *r)
	245	{
	246	if (ust_registry_is_max_id(r->used_channel_id)) {
	247	return r->used_channel_id;
	248	}
	249
	250	r->used_channel_id++;
	251	return r->next_channel_id++;
	252	}
	253
	254	/*
	255	* Return registry event count. This is read atomically.
	256	*/
	257	static inline uint32_t ust_registry_get_event_count(
	258	struct ust_registry_channel *r)
	259	{
	260	return (uint32_t) uatomic_read(&r->used_event_id);
	261	}
	262
	263	#ifdef HAVE_LIBLTTNG_UST_CTL
	264
	265	void ust_registry_channel_destroy(struct ust_registry_session *session,
	266	struct ust_registry_channel *chan);
	267	struct ust_registry_channel *ust_registry_channel_find(
	268	struct ust_registry_session *session, uint64_t key);
	269	int ust_registry_channel_add(struct ust_registry_session *session,
	270	uint64_t key);
	271	void ust_registry_channel_del_free(struct ust_registry_session *session,
	272	uint64_t key, bool notif);
	273
	274	int ust_registry_session_init(struct ust_registry_session **sessionp,
	275	struct ust_app *app,
	276	uint32_t bits_per_long,
	277	uint32_t uint8_t_alignment,
	278	uint32_t uint16_t_alignment,
	279	uint32_t uint32_t_alignment,
	280	uint32_t uint64_t_alignment,
	281	uint32_t long_alignment,
	282	int byte_order,
	283	uint32_t major,
	284	uint32_t minor,
	285	const char *root_shm_path,
	286	const char *shm_path,
	287	uid_t euid,
	288	gid_t egid,
	289	uint64_t tracing_id,
	290	uid_t tracing_uid);
	291	void ust_registry_session_destroy(struct ust_registry_session *session);
	292
	293	int ust_registry_create_event(struct ust_registry_session *session,
	294	uint64_t chan_key, int session_objd, int channel_objd, char *name,
	295	char sig, size_t nr_fields, struct lttng_ust_ctl_field fields,
	296	int loglevel_value, char *model_emf_uri, int buffer_type,
	297	uint32_t event_id_p, struct ust_app app);
	298	struct ust_registry_event *ust_registry_find_event(
	299	struct ust_registry_channel chan, char name, char *sig);
	300	void ust_registry_destroy_event(struct ust_registry_channel *chan,
	301	struct ust_registry_event *event);
	302
	303	/* app can be NULL for registry shared across applications. */
	304	int ust_metadata_session_statedump(struct ust_registry_session *session,
	305	struct ust_app *app, uint32_t major, uint32_t minor);
	306	int ust_metadata_channel_statedump(struct ust_registry_session *session,
	307	struct ust_registry_channel *chan);
	308	int ust_metadata_event_statedump(struct ust_registry_session *session,
	309	struct ust_registry_channel *chan,
	310	struct ust_registry_event *event);
	311	int ust_registry_create_or_find_enum(struct ust_registry_session *session,
	312	int session_objd, char *name,
	313	struct lttng_ust_ctl_enum_entry *entries, size_t nr_entries,
	314	uint64_t *enum_id);
	315	struct ust_registry_enum *
	316	ust_registry_lookup_enum_by_id(struct ust_registry_session *session,
	317	const char *name, uint64_t id);
	318
	319	#else /* HAVE_LIBLTTNG_UST_CTL */
	320
	321	static inline
	322	void ust_registry_channel_destroy(struct ust_registry_session *session,
	323	struct ust_registry_channel *chan)
	324	{}
	325	static inline
	326	struct ust_registry_channel *ust_registry_channel_find(
	327	struct ust_registry_session *session, uint64_t key)
	328	{
	329	return NULL;
	330	}
	331	static inline
	332	int ust_registry_channel_add(struct ust_registry_session *session,
	333	uint64_t key)
	334	{
	335	return 0;
	336	}
	337	static inline
	338	void ust_registry_channel_del_free(struct ust_registry_session *session,
	339	uint64_t key, bool notif)
	340	{}
	341	static inline
	342	int ust_registry_session_init(struct ust_registry_session **sessionp,
	343	struct ust_app *app,
	344	uint32_t bits_per_long,
	345	uint32_t uint8_t_alignment,
	346	uint32_t uint16_t_alignment,
	347	uint32_t uint32_t_alignment,
	348	uint32_t uint64_t_alignment,
	349	uint32_t long_alignment,
	350	int byte_order,
	351	uint32_t major,
	352	uint32_t minor,
	353	const char *root_shm_path,
	354	const char *shm_path,
	355	uid_t euid,
	356	gid_t egid,
	357	uint64_t tracing_id,
	358	uid_t tracing_uid)
	359	{
	360	return 0;
	361	}
	362	static inline
	363	void ust_registry_session_destroy(struct ust_registry_session *session)
	364	{}
	365	static inline
	366	int ust_registry_create_event(struct ust_registry_session *session,
	367	uint64_t chan_key, int session_objd, int channel_objd, char *name,
	368	char sig, size_t nr_fields, struct lttng_ust_ctl_field fields,
	369	int loglevel_value, char *model_emf_uri, int buffer_type,
	370	uint32_t *event_id_p)
	371	{
	372	return 0;
	373	}
	374	static inline
	375	struct ust_registry_event *ust_registry_find_event(
	376	struct ust_registry_channel chan, char name, char *sig)
	377	{
	378	return NULL;
	379	}
	380	static inline
	381	void ust_registry_destroy_event(struct ust_registry_channel *chan,
	382	struct ust_registry_event *event)
	383	{}
	384
	385	/* The app object can be NULL for registry shared across applications. */
	386	static inline
	387	int ust_metadata_session_statedump(struct ust_registry_session *session,
	388	struct ust_app *app, uint32_t major, uint32_t minor)
	389	{
	390	return 0;
	391	}
	392	static inline
	393	int ust_metadata_channel_statedump(struct ust_registry_session *session,
	394	struct ust_registry_channel *chan)
	395	{
	396	return 0;
	397	}
	398	static inline
	399	int ust_metadata_event_statedump(struct ust_registry_session *session,
	400	struct ust_registry_channel *chan,
	401	struct ust_registry_event *event)
	402	{
	403	return 0;
	404	}
	405	static inline
	406	int ust_registry_create_or_find_enum(struct ust_registry_session *session,
	407	int session_objd, char *name,
	408	struct lttng_ust_ctl_enum_entry *entries, size_t nr_entries,
	409	uint64_t *enum_id)
	410	{
	411	return 0;
	412	}
	413	static inline
	414	struct ust_registry_enum *
	415	ust_registry_lookup_enum_by_id(struct ust_registry_session *session,
	416	const char *name, uint64_t id)
	417	{
	418	return NULL;
	419	}
	420
	421	#endif /* HAVE_LIBLTTNG_UST_CTL */
	422
	423	#endif /* LTTNG_UST_REGISTRY_H */