[lttng-ust.git] / src / common / ustcomm.h

/*
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 * Copyright (C) 2011 EfficiOS Inc.
 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

/*
 * This header is meant for liblttng and libust internal use ONLY.
 * These declarations should NOT be considered stable API.
 */

#ifndef _UST_COMMON_UST_COMM_H
#define _UST_COMMON_UST_COMM_H

#include <stdint.h>
#include <limits.h>
#include <unistd.h>
#include <lttng/ust-abi.h>
#include <lttng/ust-error.h>
#include <lttng/ust-compiler.h>
#include <lttng/ust-ctl.h>

/*
 * Default timeout the application waits for the sessiond to send its
 * "register done" command. Can be overridden with the environment
 * variable "LTTNG_UST_REGISTER_TIMEOUT". Note that if the sessiond is not
 * found, the application proceeds directly without any delay.
 */
#define LTTNG_UST_DEFAULT_CONSTRUCTOR_TIMEOUT_MS	3000

#define LTTNG_DEFAULT_RUNDIR				LTTNG_SYSTEM_RUNDIR
#define LTTNG_DEFAULT_HOME_RUNDIR			".lttng"

/* Queue size of listen(2) */
#define LTTNG_UST_COMM_MAX_LISTEN			10
#define LTTNG_UST_COMM_REG_MSG_PADDING			64

struct lttng_ust_event_field;
struct lttng_ust_ctx_field;
struct lttng_ust_enum_entry;
struct lttng_integer_type;
struct lttng_ust_session;

struct lttng_ust_ctl_reg_msg {
	uint32_t magic;
	uint32_t major;
	uint32_t minor;
	uint32_t pid;
	uint32_t ppid;
	uint32_t uid;
	uint32_t gid;
	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;
	uint32_t socket_type;			/* enum lttng_ust_ctl_socket_type */
	char name[LTTNG_UST_ABI_PROCNAME_LEN];	/* process name */
	char padding[LTTNG_UST_COMM_REG_MSG_PADDING];
} __attribute__((packed));

/*
 * Data structure for the commands sent from sessiond to UST.
 */
#define USTCOMM_MSG_PADDING1		32
#define USTCOMM_MSG_PADDING2		32
struct ustcomm_ust_msg {
	uint32_t handle;
	uint32_t cmd;
	char padding[USTCOMM_MSG_PADDING1];
	union {
		struct lttng_ust_abi_channel channel;
		struct lttng_ust_abi_stream stream;
		struct lttng_ust_abi_event event;
		struct lttng_ust_abi_context context;
		struct lttng_ust_abi_tracer_version version;
		struct lttng_ust_abi_tracepoint_iter tracepoint;
		struct {
			uint32_t data_size;	/* following filter data */
			uint32_t reloc_offset;
			uint64_t seqnum;
		} __attribute__((packed)) filter;
		struct {
			uint32_t count;	/* how many names follow */
		} __attribute__((packed)) exclusion;
		struct {
			uint32_t data_size;	/* following capture data */
			uint32_t reloc_offset;
			uint64_t seqnum;
		} __attribute__((packed)) capture;
		struct lttng_ust_abi_counter counter;
		struct lttng_ust_abi_counter_global counter_global;
		struct lttng_ust_abi_counter_cpu counter_cpu;
		/*
		 * For lttng_ust_abi_EVENT_NOTIFIER_CREATE, a struct
		 * lttng_ust_abi_event_notifier implicitly follows struct
		 * ustcomm_ust_msg.
		 */
		struct {
			/* Length of struct lttng_ust_abi_event_notifier */
			uint32_t len;
		} event_notifier;
		char padding[USTCOMM_MSG_PADDING2];
	} u;
} __attribute__((packed));

/*
 * Data structure for the response from UST to the session daemon.
 * cmd_type is sent back in the reply for validation.
 */
#define USTCOMM_REPLY_PADDING1		32
#define USTCOMM_REPLY_PADDING2		32
struct ustcomm_ust_reply {
	uint32_t handle;
	uint32_t cmd;
	int32_t ret_code;	/* enum ustcomm_return_code */
	uint32_t ret_val;	/* return value */
	char padding[USTCOMM_REPLY_PADDING1];
	union {
		struct {
			uint64_t memory_map_size;
		} __attribute__((packed)) channel;
		struct {
			uint64_t memory_map_size;
		} __attribute__((packed)) stream;
		struct lttng_ust_abi_tracer_version version;
		struct lttng_ust_abi_tracepoint_iter tracepoint;
		char padding[USTCOMM_REPLY_PADDING2];
	} u;
} __attribute__((packed));

struct ustcomm_notify_hdr {
	uint32_t notify_cmd;
} __attribute__((packed));

#define USTCOMM_NOTIFY_EVENT_MSG_PADDING	32
struct ustcomm_notify_event_msg {
	uint32_t session_objd;
	uint32_t channel_objd;
	char event_name[LTTNG_UST_ABI_SYM_NAME_LEN];
	int32_t loglevel;
	uint32_t signature_len;
	uint32_t fields_len;
	uint32_t model_emf_uri_len;
	char padding[USTCOMM_NOTIFY_EVENT_MSG_PADDING];
	/* followed by signature, fields, and model_emf_uri */
} __attribute__((packed));

#define USTCOMM_NOTIFY_EVENT_REPLY_PADDING	32
struct ustcomm_notify_event_reply {
	int32_t ret_code;	/* 0: ok, negative: error code */
	uint32_t event_id;
	char padding[USTCOMM_NOTIFY_EVENT_REPLY_PADDING];
} __attribute__((packed));

#define USTCOMM_NOTIFY_ENUM_MSG_PADDING		32
struct ustcomm_notify_enum_msg {
	uint32_t session_objd;
	char enum_name[LTTNG_UST_ABI_SYM_NAME_LEN];
	uint32_t entries_len;
	char padding[USTCOMM_NOTIFY_ENUM_MSG_PADDING];
	/* followed by enum entries */
} __attribute__((packed));

#define USTCOMM_NOTIFY_EVENT_REPLY_PADDING	32
struct ustcomm_notify_enum_reply {
	int32_t ret_code;	/* 0: ok, negative: error code */
	uint64_t enum_id;
	char padding[USTCOMM_NOTIFY_EVENT_REPLY_PADDING];
} __attribute__((packed));

#define USTCOMM_NOTIFY_CHANNEL_MSG_PADDING	32
struct ustcomm_notify_channel_msg {
	uint32_t session_objd;
	uint32_t channel_objd;
	uint32_t ctx_fields_len;
	char padding[USTCOMM_NOTIFY_CHANNEL_MSG_PADDING];
	/* followed by context fields */
} __attribute__((packed));

#define USTCOMM_NOTIFY_CHANNEL_REPLY_PADDING	32
struct ustcomm_notify_channel_reply {
	int32_t ret_code;	/* 0: ok, negative: error code */
	uint32_t chan_id;
	uint32_t header_type;	/* enum lttng_ust_ctl_channel_header */
	char padding[USTCOMM_NOTIFY_CHANNEL_REPLY_PADDING];
} __attribute__((packed));

/*
 * LTTNG_UST_TRACEPOINT_FIELD_LIST reply is followed by a
 * struct lttng_ust_field_iter field.
 */

int ustcomm_create_unix_sock(const char *pathname)
	__attribute__((visibility("hidden")));

int ustcomm_connect_unix_sock(const char *pathname,
	long timeout)
	__attribute__((visibility("hidden")));

int ustcomm_accept_unix_sock(int sock)
	__attribute__((visibility("hidden")));

int ustcomm_listen_unix_sock(int sock)
	__attribute__((visibility("hidden")));

int ustcomm_shutdown_unix_sock(int sock)
	__attribute__((visibility("hidden")));

int ustcomm_close_unix_sock(int sock)
	__attribute__((visibility("hidden")));

ssize_t ustcomm_recv_unix_sock(int sock, void *buf, size_t len)
	__attribute__((visibility("hidden")));

ssize_t ustcomm_send_unix_sock(int sock, const void *buf, size_t len)
	__attribute__((visibility("hidden")));

ssize_t ustcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd)
	__attribute__((visibility("hidden")));

ssize_t ustcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd)
	__attribute__((visibility("hidden")));

const char *ustcomm_get_readable_code(int code)
	__attribute__((visibility("hidden")));

int ustcomm_send_app_msg(int sock, struct ustcomm_ust_msg *lum)
	__attribute__((visibility("hidden")));

int ustcomm_recv_app_reply(int sock, struct ustcomm_ust_reply *lur,
	uint32_t expected_handle, uint32_t expected_cmd)
	__attribute__((visibility("hidden")));

int ustcomm_send_app_cmd(int sock,
		struct ustcomm_ust_msg *lum,
		struct ustcomm_ust_reply *lur)
	__attribute__((visibility("hidden")));

int ustcomm_recv_fd(int sock)
	__attribute__((visibility("hidden")));

ssize_t ustcomm_recv_channel_from_sessiond(int sock,
		void **chan_data, uint64_t len, int *wakeup_fd)
	__attribute__((visibility("hidden")));

int ustcomm_recv_stream_from_sessiond(int sock,
		uint64_t *memory_map_size,
		int *shm_fd, int *wakeup_fd)
	__attribute__((visibility("hidden")));

ssize_t ustcomm_recv_event_notifier_notif_fd_from_sessiond(int sock,
		int *event_notifier_notif_fd)
	__attribute__((visibility("hidden")));

ssize_t ustcomm_recv_counter_from_sessiond(int sock,
		void **counter_data, uint64_t len)
	__attribute__((visibility("hidden")));

int ustcomm_recv_counter_shm_from_sessiond(int sock,
		int *shm_fd)
	__attribute__((visibility("hidden")));

/*
 * Returns 0 on success, negative error value on error.
 * Returns -EPIPE or -ECONNRESET if other end has hung up.
 */
int ustcomm_send_reg_msg(int sock,
		enum lttng_ust_ctl_socket_type type,
		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,
		const char *procname)
	__attribute__((visibility("hidden")));

/*
 * Returns 0 on success, negative error value on error.
 * Returns -EPIPE or -ECONNRESET if other end has hung up.
 */
int ustcomm_register_event(int sock,
	struct lttng_ust_session *session,
	int session_objd,		/* session descriptor */
	int channel_objd,		/* channel descriptor */
	const char *event_name,		/* event name (input) */
	int loglevel,
	const char *signature,		/* event signature (input) */
	size_t nr_fields,		/* fields */
	const struct lttng_ust_event_field * const *fields,
	const char *model_emf_uri,
	uint32_t *id)			/* event id (output) */
	__attribute__((visibility("hidden")));

/*
 * Returns 0 on success, negative error value on error.
 * Returns -EPIPE or -ECONNRESET if other end has hung up.
 */
int ustcomm_register_enum(int sock,
	int session_objd,		/* session descriptor */
	const char *enum_name,		/* enum name (input) */
	size_t nr_entries,		/* entries */
	const struct lttng_ust_enum_entry * const *entries,
	uint64_t *id)			/* enum id (output) */
	__attribute__((visibility("hidden")));

/*
 * Returns 0 on success, negative error value on error.
 * Returns -EPIPE or -ECONNRESET if other end has hung up.
 */
int ustcomm_register_channel(int sock,
	struct lttng_ust_session *session,
	int session_objd,		/* session descriptor */
	int channel_objd,		/* channel descriptor */
	size_t nr_ctx_fields,
	struct lttng_ust_ctx_field *ctx_fields,
	uint32_t *chan_id,		/* channel id (output) */
	int *header_type) 		/* header type (output) */
	__attribute__((visibility("hidden")));

int ustcomm_setsockopt_rcv_timeout(int sock, unsigned int msec)
	__attribute__((visibility("hidden")));

int ustcomm_setsockopt_snd_timeout(int sock, unsigned int msec)
	__attribute__((visibility("hidden")));

#endif	/* _UST_COMMON_UST_COMM_H */
Commit	Line	Data
	1	/*
	2	* SPDX-License-Identifier: LGPL-2.1-only
	3	*
	4	* Copyright (C) 2011 EfficiOS Inc.
	5	* Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	6	*/
	7
	8	/*
	9	* This header is meant for liblttng and libust internal use ONLY.
	10	* These declarations should NOT be considered stable API.
	11	*/
	12
	13	#ifndef _UST_COMMON_UST_COMM_H
	14	#define _UST_COMMON_UST_COMM_H
	15
	16	#include <stdint.h>
	17	#include <limits.h>
	18	#include <unistd.h>
	19	#include <lttng/ust-abi.h>
	20	#include <lttng/ust-error.h>
	21	#include <lttng/ust-compiler.h>
	22	#include <lttng/ust-ctl.h>
	23
	24	/*
	25	* Default timeout the application waits for the sessiond to send its
	26	* "register done" command. Can be overridden with the environment
	27	* variable "LTTNG_UST_REGISTER_TIMEOUT". Note that if the sessiond is not
	28	* found, the application proceeds directly without any delay.
	29	*/
	30	#define LTTNG_UST_DEFAULT_CONSTRUCTOR_TIMEOUT_MS 3000
	31
	32	#define LTTNG_DEFAULT_RUNDIR LTTNG_SYSTEM_RUNDIR
	33	#define LTTNG_DEFAULT_HOME_RUNDIR ".lttng"
	34
	35	/* Queue size of listen(2) */
	36	#define LTTNG_UST_COMM_MAX_LISTEN 10
	37	#define LTTNG_UST_COMM_REG_MSG_PADDING 64
	38
	39	struct lttng_ust_event_field;
	40	struct lttng_ust_ctx_field;
	41	struct lttng_ust_enum_entry;
	42	struct lttng_integer_type;
	43	struct lttng_ust_session;
	44
	45	struct lttng_ust_ctl_reg_msg {
	46	uint32_t magic;
	47	uint32_t major;
	48	uint32_t minor;
	49	uint32_t pid;
	50	uint32_t ppid;
	51	uint32_t uid;
	52	uint32_t gid;
	53	uint32_t bits_per_long;
	54	uint32_t uint8_t_alignment;
	55	uint32_t uint16_t_alignment;
	56	uint32_t uint32_t_alignment;
	57	uint32_t uint64_t_alignment;
	58	uint32_t long_alignment;
	59	uint32_t socket_type; /* enum lttng_ust_ctl_socket_type */
	60	char name[LTTNG_UST_ABI_PROCNAME_LEN]; /* process name */
	61	char padding[LTTNG_UST_COMM_REG_MSG_PADDING];
	62	} __attribute__((packed));
	63
	64	/*
	65	* Data structure for the commands sent from sessiond to UST.
	66	*/
	67	#define USTCOMM_MSG_PADDING1 32
	68	#define USTCOMM_MSG_PADDING2 32
	69	struct ustcomm_ust_msg {
	70	uint32_t handle;
	71	uint32_t cmd;
	72	char padding[USTCOMM_MSG_PADDING1];
	73	union {
	74	struct lttng_ust_abi_channel channel;
	75	struct lttng_ust_abi_stream stream;
	76	struct lttng_ust_abi_event event;
	77	struct lttng_ust_abi_context context;
	78	struct lttng_ust_abi_tracer_version version;
	79	struct lttng_ust_abi_tracepoint_iter tracepoint;
	80	struct {
	81	uint32_t data_size; /* following filter data */
	82	uint32_t reloc_offset;
	83	uint64_t seqnum;
	84	} __attribute__((packed)) filter;
	85	struct {
	86	uint32_t count; /* how many names follow */
	87	} __attribute__((packed)) exclusion;
	88	struct {
	89	uint32_t data_size; /* following capture data */
	90	uint32_t reloc_offset;
	91	uint64_t seqnum;
	92	} __attribute__((packed)) capture;
	93	struct lttng_ust_abi_counter counter;
	94	struct lttng_ust_abi_counter_global counter_global;
	95	struct lttng_ust_abi_counter_cpu counter_cpu;
	96	/*
	97	* For lttng_ust_abi_EVENT_NOTIFIER_CREATE, a struct
	98	* lttng_ust_abi_event_notifier implicitly follows struct
	99	* ustcomm_ust_msg.
	100	*/
	101	struct {
	102	/* Length of struct lttng_ust_abi_event_notifier */
	103	uint32_t len;
	104	} event_notifier;
	105	char padding[USTCOMM_MSG_PADDING2];
	106	} u;
	107	} __attribute__((packed));
	108
	109	/*
	110	* Data structure for the response from UST to the session daemon.
	111	* cmd_type is sent back in the reply for validation.
	112	*/
	113	#define USTCOMM_REPLY_PADDING1 32
	114	#define USTCOMM_REPLY_PADDING2 32
	115	struct ustcomm_ust_reply {
	116	uint32_t handle;
	117	uint32_t cmd;
	118	int32_t ret_code; /* enum ustcomm_return_code */
	119	uint32_t ret_val; /* return value */
	120	char padding[USTCOMM_REPLY_PADDING1];
	121	union {
	122	struct {
	123	uint64_t memory_map_size;
	124	} __attribute__((packed)) channel;
	125	struct {
	126	uint64_t memory_map_size;
	127	} __attribute__((packed)) stream;
	128	struct lttng_ust_abi_tracer_version version;
	129	struct lttng_ust_abi_tracepoint_iter tracepoint;
	130	char padding[USTCOMM_REPLY_PADDING2];
	131	} u;
	132	} __attribute__((packed));
	133
	134	struct ustcomm_notify_hdr {
	135	uint32_t notify_cmd;
	136	} __attribute__((packed));
	137
	138	#define USTCOMM_NOTIFY_EVENT_MSG_PADDING 32
	139	struct ustcomm_notify_event_msg {
	140	uint32_t session_objd;
	141	uint32_t channel_objd;
	142	char event_name[LTTNG_UST_ABI_SYM_NAME_LEN];
	143	int32_t loglevel;
	144	uint32_t signature_len;
	145	uint32_t fields_len;
	146	uint32_t model_emf_uri_len;
	147	char padding[USTCOMM_NOTIFY_EVENT_MSG_PADDING];
	148	/* followed by signature, fields, and model_emf_uri */
	149	} __attribute__((packed));
	150
	151	#define USTCOMM_NOTIFY_EVENT_REPLY_PADDING 32
	152	struct ustcomm_notify_event_reply {
	153	int32_t ret_code; /* 0: ok, negative: error code */
	154	uint32_t event_id;
	155	char padding[USTCOMM_NOTIFY_EVENT_REPLY_PADDING];
	156	} __attribute__((packed));
	157
	158	#define USTCOMM_NOTIFY_ENUM_MSG_PADDING 32
	159	struct ustcomm_notify_enum_msg {
	160	uint32_t session_objd;
	161	char enum_name[LTTNG_UST_ABI_SYM_NAME_LEN];
	162	uint32_t entries_len;
	163	char padding[USTCOMM_NOTIFY_ENUM_MSG_PADDING];
	164	/* followed by enum entries */
	165	} __attribute__((packed));
	166
	167	#define USTCOMM_NOTIFY_EVENT_REPLY_PADDING 32
	168	struct ustcomm_notify_enum_reply {
	169	int32_t ret_code; /* 0: ok, negative: error code */
	170	uint64_t enum_id;
	171	char padding[USTCOMM_NOTIFY_EVENT_REPLY_PADDING];
	172	} __attribute__((packed));
	173
	174	#define USTCOMM_NOTIFY_CHANNEL_MSG_PADDING 32
	175	struct ustcomm_notify_channel_msg {
	176	uint32_t session_objd;
	177	uint32_t channel_objd;
	178	uint32_t ctx_fields_len;
	179	char padding[USTCOMM_NOTIFY_CHANNEL_MSG_PADDING];
	180	/* followed by context fields */
	181	} __attribute__((packed));
	182
	183	#define USTCOMM_NOTIFY_CHANNEL_REPLY_PADDING 32
	184	struct ustcomm_notify_channel_reply {
	185	int32_t ret_code; /* 0: ok, negative: error code */
	186	uint32_t chan_id;
	187	uint32_t header_type; /* enum lttng_ust_ctl_channel_header */
	188	char padding[USTCOMM_NOTIFY_CHANNEL_REPLY_PADDING];
	189	} __attribute__((packed));
	190
	191	/*
	192	* LTTNG_UST_TRACEPOINT_FIELD_LIST reply is followed by a
	193	* struct lttng_ust_field_iter field.
	194	*/
	195
	196	int ustcomm_create_unix_sock(const char *pathname)
	197	__attribute__((visibility("hidden")));
	198
	199	int ustcomm_connect_unix_sock(const char *pathname,
	200	long timeout)
	201	__attribute__((visibility("hidden")));
	202
	203	int ustcomm_accept_unix_sock(int sock)
	204	__attribute__((visibility("hidden")));
	205
	206	int ustcomm_listen_unix_sock(int sock)
	207	__attribute__((visibility("hidden")));
	208
	209	int ustcomm_shutdown_unix_sock(int sock)
	210	__attribute__((visibility("hidden")));
	211
	212	int ustcomm_close_unix_sock(int sock)
	213	__attribute__((visibility("hidden")));
	214
	215	ssize_t ustcomm_recv_unix_sock(int sock, void *buf, size_t len)
	216	__attribute__((visibility("hidden")));
	217
	218	ssize_t ustcomm_send_unix_sock(int sock, const void *buf, size_t len)
	219	__attribute__((visibility("hidden")));
	220
	221	ssize_t ustcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd)
	222	__attribute__((visibility("hidden")));
	223
	224	ssize_t ustcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd)
	225	__attribute__((visibility("hidden")));
	226
	227	const char *ustcomm_get_readable_code(int code)
	228	__attribute__((visibility("hidden")));
	229
	230	int ustcomm_send_app_msg(int sock, struct ustcomm_ust_msg *lum)
	231	__attribute__((visibility("hidden")));
	232
	233	int ustcomm_recv_app_reply(int sock, struct ustcomm_ust_reply *lur,
	234	uint32_t expected_handle, uint32_t expected_cmd)
	235	__attribute__((visibility("hidden")));
	236
	237	int ustcomm_send_app_cmd(int sock,
	238	struct ustcomm_ust_msg *lum,
	239	struct ustcomm_ust_reply *lur)
	240	__attribute__((visibility("hidden")));
	241
	242	int ustcomm_recv_fd(int sock)
	243	__attribute__((visibility("hidden")));
	244
	245	ssize_t ustcomm_recv_channel_from_sessiond(int sock,
	246	void *chan_data, uint64_t len, int wakeup_fd)
	247	__attribute__((visibility("hidden")));
	248
	249	int ustcomm_recv_stream_from_sessiond(int sock,
	250	uint64_t *memory_map_size,
	251	int shm_fd, int wakeup_fd)
	252	__attribute__((visibility("hidden")));
	253
	254	ssize_t ustcomm_recv_event_notifier_notif_fd_from_sessiond(int sock,
	255	int *event_notifier_notif_fd)
	256	__attribute__((visibility("hidden")));
	257
	258	ssize_t ustcomm_recv_counter_from_sessiond(int sock,
	259	void **counter_data, uint64_t len)
	260	__attribute__((visibility("hidden")));
	261
	262	int ustcomm_recv_counter_shm_from_sessiond(int sock,
	263	int *shm_fd)
	264	__attribute__((visibility("hidden")));
	265
	266	/*
	267	* Returns 0 on success, negative error value on error.
	268	* Returns -EPIPE or -ECONNRESET if other end has hung up.
	269	*/
	270	int ustcomm_send_reg_msg(int sock,
	271	enum lttng_ust_ctl_socket_type type,
	272	uint32_t bits_per_long,
	273	uint32_t uint8_t_alignment,
	274	uint32_t uint16_t_alignment,
	275	uint32_t uint32_t_alignment,
	276	uint32_t uint64_t_alignment,
	277	uint32_t long_alignment,
	278	const char *procname)
	279	__attribute__((visibility("hidden")));
	280
	281	/*
	282	* Returns 0 on success, negative error value on error.
	283	* Returns -EPIPE or -ECONNRESET if other end has hung up.
	284	*/
	285	int ustcomm_register_event(int sock,
	286	struct lttng_ust_session *session,
	287	int session_objd, /* session descriptor */
	288	int channel_objd, /* channel descriptor */
	289	const char event_name, / event name (input) */
	290	int loglevel,
	291	const char signature, / event signature (input) */
	292	size_t nr_fields, /* fields */
	293	const struct lttng_ust_event_field * const *fields,
	294	const char *model_emf_uri,
	295	uint32_t id) / event id (output) */
	296	__attribute__((visibility("hidden")));
	297
	298	/*
	299	* Returns 0 on success, negative error value on error.
	300	* Returns -EPIPE or -ECONNRESET if other end has hung up.
	301	*/
	302	int ustcomm_register_enum(int sock,
	303	int session_objd, /* session descriptor */
	304	const char enum_name, / enum name (input) */
	305	size_t nr_entries, /* entries */
	306	const struct lttng_ust_enum_entry * const *entries,
	307	uint64_t id) / enum id (output) */
	308	__attribute__((visibility("hidden")));
	309
	310	/*
	311	* Returns 0 on success, negative error value on error.
	312	* Returns -EPIPE or -ECONNRESET if other end has hung up.
	313	*/
	314	int ustcomm_register_channel(int sock,
	315	struct lttng_ust_session *session,
	316	int session_objd, /* session descriptor */
	317	int channel_objd, /* channel descriptor */
	318	size_t nr_ctx_fields,
	319	struct lttng_ust_ctx_field *ctx_fields,
	320	uint32_t chan_id, / channel id (output) */
	321	int header_type) / header type (output) */
	322	__attribute__((visibility("hidden")));
	323
	324	int ustcomm_setsockopt_rcv_timeout(int sock, unsigned int msec)
	325	__attribute__((visibility("hidden")));
	326
	327	int ustcomm_setsockopt_snd_timeout(int sock, unsigned int msec)
	328	__attribute__((visibility("hidden")));
	329
	330	#endif /* _UST_COMMON_UST_COMM_H */