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

/*
 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
 * Copyright (C) 2011-2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License only.
 *
 * 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_CTL_H
#define _LTTNG_UST_CTL_H

#include <sys/types.h>

#include "lttng-ust-abi.h"

#ifndef LTTNG_UST_UUID_LEN
#define LTTNG_UST_UUID_LEN	16
#endif

/* Default unix socket path */
#define LTTNG_UST_SOCK_FILENAME					\
	"lttng-ust-sock-"					\
	__ust_stringify(LTTNG_UST_ABI_MAJOR_VERSION)

/*
 * Shared memory files path are automatically related to shm root, e.g.
 * /dev/shm under linux.
 */
#define LTTNG_UST_WAIT_FILENAME					\
	"lttng-ust-wait-"					\
	__ust_stringify(LTTNG_UST_ABI_MAJOR_VERSION)

struct lttng_ust_shm_handle;
struct lttng_ust_lib_ring_buffer;

struct ustctl_consumer_channel_attr {
	enum lttng_ust_chan_type type;
	uint64_t subbuf_size;			/* bytes, power of 2 */
	uint64_t num_subbuf;			/* power of 2 */
	int overwrite;				/* 1: overwrite, 0: discard */
	unsigned int switch_timer_interval;	/* usec */
	unsigned int read_timer_interval;	/* usec */
	enum lttng_ust_output output;		/* splice, mmap */
	uint32_t chan_id;           /* channel ID */
	unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */
} LTTNG_PACKED;

/*
 * API used by sessiond.
 */

struct lttng_ust_context_attr {
	enum lttng_ust_context_type ctx;
	union {
		struct lttng_ust_perf_counter_ctx perf_counter;
		struct {
		        char *provider_name;
			char *ctx_name;
		} app_ctx;
	} u;
};

/*
 * Error values: all the following functions return:
 * >= 0: Success (LTTNG_UST_OK)
 * < 0: error code.
 */
int ustctl_register_done(int sock);
int ustctl_create_session(int sock);
int ustctl_create_event(int sock, struct lttng_ust_event *ev,
		struct lttng_ust_object_data *channel_data,
		struct lttng_ust_object_data **event_data);
int ustctl_add_context(int sock, struct lttng_ust_context_attr *ctx,
		struct lttng_ust_object_data *obj_data,
		struct lttng_ust_object_data **context_data);
int ustctl_set_filter(int sock, struct lttng_ust_filter_bytecode *bytecode,
		struct lttng_ust_object_data *obj_data);

int ustctl_enable(int sock, struct lttng_ust_object_data *object);
int ustctl_disable(int sock, struct lttng_ust_object_data *object);
int ustctl_start_session(int sock, int handle);
int ustctl_stop_session(int sock, int handle);

/*
 * ustctl_tracepoint_list returns a tracepoint list handle, or negative
 * error value.
 */
int ustctl_tracepoint_list(int sock);

/*
 * ustctl_tracepoint_list_get is used to iterate on the tp list
 * handle. End is iteration is reached when -LTTNG_UST_ERR_NOENT is
 * returned.
 */
int ustctl_tracepoint_list_get(int sock, int tp_list_handle,
		struct lttng_ust_tracepoint_iter *iter);

/*
 * ustctl_tracepoint_field_list returns a tracepoint field list handle,
 * or negative error value.
 */
int ustctl_tracepoint_field_list(int sock);

/*
 * ustctl_tracepoint_field_list_get is used to iterate on the tp field
 * list handle. End is iteration is reached when -LTTNG_UST_ERR_NOENT is
 * returned.
 */
int ustctl_tracepoint_field_list_get(int sock, int tp_field_list_handle,
		struct lttng_ust_field_iter *iter);

int ustctl_tracer_version(int sock, struct lttng_ust_tracer_version *v);
int ustctl_wait_quiescent(int sock);

int ustctl_sock_flush_buffer(int sock, struct lttng_ust_object_data *object);

int ustctl_calibrate(int sock, struct lttng_ust_calibrate *calibrate);

/* Release object created by members of this API. */
int ustctl_release_object(int sock, struct lttng_ust_object_data *data);
/* Release handle returned by create session. */
int ustctl_release_handle(int sock, int handle);

int ustctl_recv_channel_from_consumer(int sock,
		struct lttng_ust_object_data **channel_data);
int ustctl_recv_stream_from_consumer(int sock,
		struct lttng_ust_object_data **stream_data);
int ustctl_send_channel_to_ust(int sock, int session_handle,
		struct lttng_ust_object_data *channel_data);
int ustctl_send_stream_to_ust(int sock,
		struct lttng_ust_object_data *channel_data,
		struct lttng_ust_object_data *stream_data);

/*
 * ustctl_duplicate_ust_object_data allocated a new object in "dest" if
 * it succeeds (returns 0). It must be released using
 * ustctl_release_object() and then freed with free().
 */
int ustctl_duplicate_ust_object_data(struct lttng_ust_object_data **dest,
		struct lttng_ust_object_data *src);

/*
 * API used by consumer.
 */

struct ustctl_consumer_channel;
struct ustctl_consumer_stream;
struct ustctl_consumer_channel_attr;

struct ustctl_consumer_channel *
	ustctl_create_channel(struct ustctl_consumer_channel_attr *attr);
/*
 * Each stream created needs to be destroyed before calling
 * ustctl_destroy_channel().
 */
void ustctl_destroy_channel(struct ustctl_consumer_channel *chan);

int ustctl_send_channel_to_sessiond(int sock,
		struct ustctl_consumer_channel *channel);
int ustctl_channel_close_wait_fd(struct ustctl_consumer_channel *consumer_chan);
int ustctl_channel_close_wakeup_fd(struct ustctl_consumer_channel *consumer_chan);
int ustctl_channel_get_wait_fd(struct ustctl_consumer_channel *consumer_chan);
int ustctl_channel_get_wakeup_fd(struct ustctl_consumer_channel *consumer_chan);

int ustctl_write_metadata_to_channel(
		struct ustctl_consumer_channel *channel,
		const char *metadata_str,	/* NOT null-terminated */
		size_t len);			/* metadata length */

/*
 * Send a NULL stream to finish iteration over all streams of a given
 * channel.
 */
int ustctl_send_stream_to_sessiond(int sock,
		struct ustctl_consumer_stream *stream);
int ustctl_stream_close_wait_fd(struct ustctl_consumer_stream *stream);
int ustctl_stream_close_wakeup_fd(struct ustctl_consumer_stream *stream);
int ustctl_stream_get_wait_fd(struct ustctl_consumer_stream *stream);
int ustctl_stream_get_wakeup_fd(struct ustctl_consumer_stream *stream);

/* Create/destroy stream buffers for read */
struct ustctl_consumer_stream *
	ustctl_create_stream(struct ustctl_consumer_channel *channel,
			int cpu);
void ustctl_destroy_stream(struct ustctl_consumer_stream *stream);

/* For mmap mode, readable without "get" operation */
int ustctl_get_mmap_len(struct ustctl_consumer_stream *stream,
		unsigned long *len);
int ustctl_get_max_subbuf_size(struct ustctl_consumer_stream *stream,
		unsigned long *len);

/*
 * For mmap mode, operate on the current packet (between get/put or
 * get_next/put_next).
 */
void *ustctl_get_mmap_base(struct ustctl_consumer_stream *stream);
int ustctl_get_mmap_read_offset(struct ustctl_consumer_stream *stream,
		unsigned long *off);
int ustctl_get_subbuf_size(struct ustctl_consumer_stream *stream,
		unsigned long *len);
int ustctl_get_padded_subbuf_size(struct ustctl_consumer_stream *stream,
		unsigned long *len);
int ustctl_get_next_subbuf(struct ustctl_consumer_stream *stream);
int ustctl_put_next_subbuf(struct ustctl_consumer_stream *stream);

/* snapshot */

int ustctl_snapshot(struct ustctl_consumer_stream *stream);
int ustctl_snapshot_get_consumed(struct ustctl_consumer_stream *stream,
		unsigned long *pos);
int ustctl_snapshot_get_produced(struct ustctl_consumer_stream *stream,
		unsigned long *pos);
int ustctl_get_subbuf(struct ustctl_consumer_stream *stream,
		unsigned long *pos);
int ustctl_put_subbuf(struct ustctl_consumer_stream *stream);

void ustctl_flush_buffer(struct ustctl_consumer_stream *stream,
		int producer_active);

/* event registry management */

enum ustctl_socket_type {
	USTCTL_SOCKET_CMD = 0,
	USTCTL_SOCKET_NOTIFY = 1,
};

enum ustctl_notify_cmd {
	USTCTL_NOTIFY_CMD_EVENT = 0,
	USTCTL_NOTIFY_CMD_CHANNEL = 1,
	USTCTL_NOTIFY_CMD_ENUM = 2,
};

enum ustctl_channel_header {
	USTCTL_CHANNEL_HEADER_UNKNOWN = 0,
	USTCTL_CHANNEL_HEADER_COMPACT = 1,
	USTCTL_CHANNEL_HEADER_LARGE = 2,
};

/* event type structures */

enum ustctl_abstract_types {
	ustctl_atype_integer,
	ustctl_atype_enum,
	ustctl_atype_array,
	ustctl_atype_sequence,
	ustctl_atype_string,
	ustctl_atype_float,
	NR_USTCTL_ABSTRACT_TYPES,
};

enum ustctl_string_encodings {
	ustctl_encode_none = 0,
	ustctl_encode_UTF8 = 1,
	ustctl_encode_ASCII = 2,
	NR_USTCTL_STRING_ENCODINGS,
};

#define USTCTL_UST_INTEGER_TYPE_PADDING	24
struct ustctl_integer_type {
	uint32_t size;		/* in bits */
	uint32_t signedness;
	uint32_t reverse_byte_order;
	uint32_t base;		/* 2, 8, 10, 16, for pretty print */
	enum ustctl_string_encodings encoding;
	uint16_t alignment;	/* in bits */
	char padding[USTCTL_UST_INTEGER_TYPE_PADDING];
} LTTNG_PACKED;

#define USTCTL_UST_FLOAT_TYPE_PADDING	24
struct ustctl_float_type {
	uint32_t exp_dig;		/* exponent digits, in bits */
	uint32_t mant_dig;		/* mantissa digits, in bits */
	uint32_t reverse_byte_order;
	uint16_t alignment;	/* in bits */
	char padding[USTCTL_UST_FLOAT_TYPE_PADDING];
} LTTNG_PACKED;

#define USTCTL_UST_ENUM_VALUE_PADDING	15
struct ustctl_enum_value {
	uint64_t value;
	uint8_t signedness;
	char padding[USTCTL_UST_ENUM_VALUE_PADDING];
} LTTNG_PACKED;

#define USTCTL_UST_ENUM_ENTRY_PADDING	32
struct ustctl_enum_entry {
	struct ustctl_enum_value start, end; /* start and end are inclusive */
	char string[LTTNG_UST_SYM_NAME_LEN];
	char padding[USTCTL_UST_ENUM_ENTRY_PADDING];
} LTTNG_PACKED;

#define USTCTL_UST_BASIC_TYPE_PADDING	296
union _ustctl_basic_type {
	struct ustctl_integer_type integer;
	struct {
		enum ustctl_string_encodings encoding;
	} string;
	struct ustctl_float_type _float;
	struct {
		char name[LTTNG_UST_SYM_NAME_LEN];
	} enumeration;
	char padding[USTCTL_UST_BASIC_TYPE_PADDING];
} LTTNG_PACKED;

struct ustctl_basic_type {
	enum ustctl_abstract_types atype;
	union {
		union _ustctl_basic_type basic;
	} u;
} LTTNG_PACKED;

#define USTCTL_UST_TYPE_PADDING	128
struct ustctl_type {
	enum ustctl_abstract_types atype;
	union {
		union _ustctl_basic_type basic;
		struct {
			struct ustctl_basic_type elem_type;
			uint32_t length;		/* num. elems. */
		} array;
		struct {
			struct ustctl_basic_type length_type;
			struct ustctl_basic_type elem_type;
		} sequence;
		char padding[USTCTL_UST_TYPE_PADDING];
	} u;
} LTTNG_PACKED;

#define USTCTL_UST_FIELD_PADDING	28
struct ustctl_field {
	char name[LTTNG_UST_SYM_NAME_LEN];
	struct ustctl_type type;
	char padding[USTCTL_UST_FIELD_PADDING];
} LTTNG_PACKED;

/*
 * Returns 0 on success, negative error value on error.
 * If an error other than -LTTNG_UST_ERR_UNSUP_MAJOR is returned,
 * the output fields are not populated.
 */
int ustctl_recv_reg_msg(int sock,
	enum ustctl_socket_type *type,
	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,
	int *byte_order,
	char *name);	/* size LTTNG_UST_ABI_PROCNAME_LEN */

/*
 * Returns 0 on success, negative UST or system error value on error.
 * Receive the notification command. The "notify_cmd" can then be used
 * by the caller to find out which ustctl_recv_* function should be
 * called to receive the notification, and which ustctl_reply_* is
 * appropriate.
 */
int ustctl_recv_notify(int sock, enum ustctl_notify_cmd *notify_cmd);

/*
 * Returns 0 on success, negative UST or system error value on error.
 */
int ustctl_recv_register_event(int sock,
	int *session_objd,		/* session descriptor (output) */
	int *channel_objd,		/* channel descriptor (output) */
	char *event_name,		/*
					 * event name (output,
					 * size LTTNG_UST_SYM_NAME_LEN)
					 */
	int *loglevel_value,
	char **signature,		/*
					 * event signature
					 * (output, dynamically
					 * allocated, must be free(3)'d
					 * by the caller if function
					 * returns success.)
					 */
	size_t *nr_fields,
	struct ustctl_field **fields,
	char **model_emf_uri);

/*
 * Returns 0 on success, negative error value on error.
 */
int ustctl_reply_register_event(int sock,
	uint32_t id,			/* event id (input) */
	int ret_code);			/* return code. 0 ok, negative error */

/*
 * Returns 0 on success, negative UST or system error value on error.
 */
int ustctl_recv_register_enum(int sock,
	int *session_objd,
	char *enum_name,
	struct ustctl_enum_entry **entries,
	unsigned int *nr_entries);

/*
 * Returns 0 on success, negative error value on error.
 */
int ustctl_reply_register_enum(int sock,
	int64_t id,			/* enum id (input) */
	int ret_code);

/*
 * Returns 0 on success, negative UST or system error value on error.
 */
int ustctl_recv_register_channel(int sock,
	int *session_objd,		/* session descriptor (output) */
	int *channel_objd,		/* channel descriptor (output) */
	size_t *nr_fields,		/* context fields */
	struct ustctl_field **fields);

/*
 * Returns 0 on success, negative error value on error.
 */
int ustctl_reply_register_channel(int sock,
	uint32_t chan_id,
	enum ustctl_channel_header header_type,
	int ret_code);			/* return code. 0 ok, negative error */

#endif /* _LTTNG_UST_CTL_H */
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
	3	* Copyright (C) 2011-2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; version 2 of the License only.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along
	15	* with this program; if not, write to the Free Software Foundation, Inc.,
	16	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	17	*/
	18
	19	#ifndef _LTTNG_UST_CTL_H
	20	#define _LTTNG_UST_CTL_H
	21
	22	#include <sys/types.h>
	23
	24	#include "lttng-ust-abi.h"
	25
	26	#ifndef LTTNG_UST_UUID_LEN
	27	#define LTTNG_UST_UUID_LEN 16
	28	#endif
	29
	30	/* Default unix socket path */
	31	#define LTTNG_UST_SOCK_FILENAME \
	32	"lttng-ust-sock-" \
	33	__ust_stringify(LTTNG_UST_ABI_MAJOR_VERSION)
	34
	35	/*
	36	* Shared memory files path are automatically related to shm root, e.g.
	37	* /dev/shm under linux.
	38	*/
	39	#define LTTNG_UST_WAIT_FILENAME \
	40	"lttng-ust-wait-" \
	41	__ust_stringify(LTTNG_UST_ABI_MAJOR_VERSION)
	42
	43	struct lttng_ust_shm_handle;
	44	struct lttng_ust_lib_ring_buffer;
	45
	46	struct ustctl_consumer_channel_attr {
	47	enum lttng_ust_chan_type type;
	48	uint64_t subbuf_size; /* bytes, power of 2 */
	49	uint64_t num_subbuf; /* power of 2 */
	50	int overwrite; /* 1: overwrite, 0: discard */
	51	unsigned int switch_timer_interval; /* usec */
	52	unsigned int read_timer_interval; /* usec */
	53	enum lttng_ust_output output; /* splice, mmap */
	54	uint32_t chan_id; /* channel ID */
	55	unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */
	56	} LTTNG_PACKED;
	57
	58	/*
	59	* API used by sessiond.
	60	*/
	61
	62	struct lttng_ust_context_attr {
	63	enum lttng_ust_context_type ctx;
	64	union {
	65	struct lttng_ust_perf_counter_ctx perf_counter;
	66	struct {
	67	char *provider_name;
	68	char *ctx_name;
	69	} app_ctx;
	70	} u;
	71	};
	72
	73	/*
	74	* Error values: all the following functions return:
	75	* >= 0: Success (LTTNG_UST_OK)
	76	* < 0: error code.
	77	*/
	78	int ustctl_register_done(int sock);
	79	int ustctl_create_session(int sock);
	80	int ustctl_create_event(int sock, struct lttng_ust_event *ev,
	81	struct lttng_ust_object_data *channel_data,
	82	struct lttng_ust_object_data **event_data);
	83	int ustctl_add_context(int sock, struct lttng_ust_context_attr *ctx,
	84	struct lttng_ust_object_data *obj_data,
	85	struct lttng_ust_object_data **context_data);
	86	int ustctl_set_filter(int sock, struct lttng_ust_filter_bytecode *bytecode,
	87	struct lttng_ust_object_data *obj_data);
	88
	89	int ustctl_enable(int sock, struct lttng_ust_object_data *object);
	90	int ustctl_disable(int sock, struct lttng_ust_object_data *object);
	91	int ustctl_start_session(int sock, int handle);
	92	int ustctl_stop_session(int sock, int handle);
	93
	94	/*
	95	* ustctl_tracepoint_list returns a tracepoint list handle, or negative
	96	* error value.
	97	*/
	98	int ustctl_tracepoint_list(int sock);
	99
	100	/*
	101	* ustctl_tracepoint_list_get is used to iterate on the tp list
	102	* handle. End is iteration is reached when -LTTNG_UST_ERR_NOENT is
	103	* returned.
	104	*/
	105	int ustctl_tracepoint_list_get(int sock, int tp_list_handle,
	106	struct lttng_ust_tracepoint_iter *iter);
	107
	108	/*
	109	* ustctl_tracepoint_field_list returns a tracepoint field list handle,
	110	* or negative error value.
	111	*/
	112	int ustctl_tracepoint_field_list(int sock);
	113
	114	/*
	115	* ustctl_tracepoint_field_list_get is used to iterate on the tp field
	116	* list handle. End is iteration is reached when -LTTNG_UST_ERR_NOENT is
	117	* returned.
	118	*/
	119	int ustctl_tracepoint_field_list_get(int sock, int tp_field_list_handle,
	120	struct lttng_ust_field_iter *iter);
	121
	122	int ustctl_tracer_version(int sock, struct lttng_ust_tracer_version *v);
	123	int ustctl_wait_quiescent(int sock);
	124
	125	int ustctl_sock_flush_buffer(int sock, struct lttng_ust_object_data *object);
	126
	127	int ustctl_calibrate(int sock, struct lttng_ust_calibrate *calibrate);
	128
	129	/* Release object created by members of this API. */
	130	int ustctl_release_object(int sock, struct lttng_ust_object_data *data);
	131	/* Release handle returned by create session. */
	132	int ustctl_release_handle(int sock, int handle);
	133
	134	int ustctl_recv_channel_from_consumer(int sock,
	135	struct lttng_ust_object_data **channel_data);
	136	int ustctl_recv_stream_from_consumer(int sock,
	137	struct lttng_ust_object_data **stream_data);
	138	int ustctl_send_channel_to_ust(int sock, int session_handle,
	139	struct lttng_ust_object_data *channel_data);
	140	int ustctl_send_stream_to_ust(int sock,
	141	struct lttng_ust_object_data *channel_data,
	142	struct lttng_ust_object_data *stream_data);
	143
	144	/*
	145	* ustctl_duplicate_ust_object_data allocated a new object in "dest" if
	146	* it succeeds (returns 0). It must be released using
	147	* ustctl_release_object() and then freed with free().
	148	*/
	149	int ustctl_duplicate_ust_object_data(struct lttng_ust_object_data **dest,
	150	struct lttng_ust_object_data *src);
	151
	152	/*
	153	* API used by consumer.
	154	*/
	155
	156	struct ustctl_consumer_channel;
	157	struct ustctl_consumer_stream;
	158	struct ustctl_consumer_channel_attr;
	159
	160	struct ustctl_consumer_channel *
	161	ustctl_create_channel(struct ustctl_consumer_channel_attr *attr);
	162	/*
	163	* Each stream created needs to be destroyed before calling
	164	* ustctl_destroy_channel().
	165	*/
	166	void ustctl_destroy_channel(struct ustctl_consumer_channel *chan);
	167
	168	int ustctl_send_channel_to_sessiond(int sock,
	169	struct ustctl_consumer_channel *channel);
	170	int ustctl_channel_close_wait_fd(struct ustctl_consumer_channel *consumer_chan);
	171	int ustctl_channel_close_wakeup_fd(struct ustctl_consumer_channel *consumer_chan);
	172	int ustctl_channel_get_wait_fd(struct ustctl_consumer_channel *consumer_chan);
	173	int ustctl_channel_get_wakeup_fd(struct ustctl_consumer_channel *consumer_chan);
	174
	175	int ustctl_write_metadata_to_channel(
	176	struct ustctl_consumer_channel *channel,
	177	const char metadata_str, / NOT null-terminated */
	178	size_t len); /* metadata length */
	179
	180	/*
	181	* Send a NULL stream to finish iteration over all streams of a given
	182	* channel.
	183	*/
	184	int ustctl_send_stream_to_sessiond(int sock,
	185	struct ustctl_consumer_stream *stream);
	186	int ustctl_stream_close_wait_fd(struct ustctl_consumer_stream *stream);
	187	int ustctl_stream_close_wakeup_fd(struct ustctl_consumer_stream *stream);
	188	int ustctl_stream_get_wait_fd(struct ustctl_consumer_stream *stream);
	189	int ustctl_stream_get_wakeup_fd(struct ustctl_consumer_stream *stream);
	190
	191	/* Create/destroy stream buffers for read */
	192	struct ustctl_consumer_stream *
	193	ustctl_create_stream(struct ustctl_consumer_channel *channel,
	194	int cpu);
	195	void ustctl_destroy_stream(struct ustctl_consumer_stream *stream);
	196
	197	/* For mmap mode, readable without "get" operation */
	198	int ustctl_get_mmap_len(struct ustctl_consumer_stream *stream,
	199	unsigned long *len);
	200	int ustctl_get_max_subbuf_size(struct ustctl_consumer_stream *stream,
	201	unsigned long *len);
	202
	203	/*
	204	* For mmap mode, operate on the current packet (between get/put or
	205	* get_next/put_next).
	206	*/
	207	void ustctl_get_mmap_base(struct ustctl_consumer_stream stream);
	208	int ustctl_get_mmap_read_offset(struct ustctl_consumer_stream *stream,
	209	unsigned long *off);
	210	int ustctl_get_subbuf_size(struct ustctl_consumer_stream *stream,
	211	unsigned long *len);
	212	int ustctl_get_padded_subbuf_size(struct ustctl_consumer_stream *stream,
	213	unsigned long *len);
	214	int ustctl_get_next_subbuf(struct ustctl_consumer_stream *stream);
	215	int ustctl_put_next_subbuf(struct ustctl_consumer_stream *stream);
	216
	217	/* snapshot */
	218
	219	int ustctl_snapshot(struct ustctl_consumer_stream *stream);
	220	int ustctl_snapshot_get_consumed(struct ustctl_consumer_stream *stream,
	221	unsigned long *pos);
	222	int ustctl_snapshot_get_produced(struct ustctl_consumer_stream *stream,
	223	unsigned long *pos);
	224	int ustctl_get_subbuf(struct ustctl_consumer_stream *stream,
	225	unsigned long *pos);
	226	int ustctl_put_subbuf(struct ustctl_consumer_stream *stream);
	227
	228	void ustctl_flush_buffer(struct ustctl_consumer_stream *stream,
	229	int producer_active);
	230
	231	/* event registry management */
	232
	233	enum ustctl_socket_type {
	234	USTCTL_SOCKET_CMD = 0,
	235	USTCTL_SOCKET_NOTIFY = 1,
	236	};
	237
	238	enum ustctl_notify_cmd {
	239	USTCTL_NOTIFY_CMD_EVENT = 0,
	240	USTCTL_NOTIFY_CMD_CHANNEL = 1,
	241	USTCTL_NOTIFY_CMD_ENUM = 2,
	242	};
	243
	244	enum ustctl_channel_header {
	245	USTCTL_CHANNEL_HEADER_UNKNOWN = 0,
	246	USTCTL_CHANNEL_HEADER_COMPACT = 1,
	247	USTCTL_CHANNEL_HEADER_LARGE = 2,
	248	};
	249
	250	/* event type structures */
	251
	252	enum ustctl_abstract_types {
	253	ustctl_atype_integer,
	254	ustctl_atype_enum,
	255	ustctl_atype_array,
	256	ustctl_atype_sequence,
	257	ustctl_atype_string,
	258	ustctl_atype_float,
	259	NR_USTCTL_ABSTRACT_TYPES,
	260	};
	261
	262	enum ustctl_string_encodings {
	263	ustctl_encode_none = 0,
	264	ustctl_encode_UTF8 = 1,
	265	ustctl_encode_ASCII = 2,
	266	NR_USTCTL_STRING_ENCODINGS,
	267	};
	268
	269	#define USTCTL_UST_INTEGER_TYPE_PADDING 24
	270	struct ustctl_integer_type {
	271	uint32_t size; /* in bits */
	272	uint32_t signedness;
	273	uint32_t reverse_byte_order;
	274	uint32_t base; /* 2, 8, 10, 16, for pretty print */
	275	enum ustctl_string_encodings encoding;
	276	uint16_t alignment; /* in bits */
	277	char padding[USTCTL_UST_INTEGER_TYPE_PADDING];
	278	} LTTNG_PACKED;
	279
	280	#define USTCTL_UST_FLOAT_TYPE_PADDING 24
	281	struct ustctl_float_type {
	282	uint32_t exp_dig; /* exponent digits, in bits */
	283	uint32_t mant_dig; /* mantissa digits, in bits */
	284	uint32_t reverse_byte_order;
	285	uint16_t alignment; /* in bits */
	286	char padding[USTCTL_UST_FLOAT_TYPE_PADDING];
	287	} LTTNG_PACKED;
	288
	289	#define USTCTL_UST_ENUM_VALUE_PADDING 15
	290	struct ustctl_enum_value {
	291	uint64_t value;
	292	uint8_t signedness;
	293	char padding[USTCTL_UST_ENUM_VALUE_PADDING];
	294	} LTTNG_PACKED;
	295
	296	#define USTCTL_UST_ENUM_ENTRY_PADDING 32
	297	struct ustctl_enum_entry {
	298	struct ustctl_enum_value start, end; /* start and end are inclusive */
	299	char string[LTTNG_UST_SYM_NAME_LEN];
	300	char padding[USTCTL_UST_ENUM_ENTRY_PADDING];
	301	} LTTNG_PACKED;
	302
	303	#define USTCTL_UST_BASIC_TYPE_PADDING 296
	304	union _ustctl_basic_type {
	305	struct ustctl_integer_type integer;
	306	struct {
	307	enum ustctl_string_encodings encoding;
	308	} string;
	309	struct ustctl_float_type _float;
	310	struct {
	311	char name[LTTNG_UST_SYM_NAME_LEN];
	312	} enumeration;
	313	char padding[USTCTL_UST_BASIC_TYPE_PADDING];
	314	} LTTNG_PACKED;
	315
	316	struct ustctl_basic_type {
	317	enum ustctl_abstract_types atype;
	318	union {
	319	union _ustctl_basic_type basic;
	320	} u;
	321	} LTTNG_PACKED;
	322
	323	#define USTCTL_UST_TYPE_PADDING 128
	324	struct ustctl_type {
	325	enum ustctl_abstract_types atype;
	326	union {
	327	union _ustctl_basic_type basic;
	328	struct {
	329	struct ustctl_basic_type elem_type;
	330	uint32_t length; /* num. elems. */
	331	} array;
	332	struct {
	333	struct ustctl_basic_type length_type;
	334	struct ustctl_basic_type elem_type;
	335	} sequence;
	336	char padding[USTCTL_UST_TYPE_PADDING];
	337	} u;
	338	} LTTNG_PACKED;
	339
	340	#define USTCTL_UST_FIELD_PADDING 28
	341	struct ustctl_field {
	342	char name[LTTNG_UST_SYM_NAME_LEN];
	343	struct ustctl_type type;
	344	char padding[USTCTL_UST_FIELD_PADDING];
	345	} LTTNG_PACKED;
	346
	347	/*
	348	* Returns 0 on success, negative error value on error.
	349	* If an error other than -LTTNG_UST_ERR_UNSUP_MAJOR is returned,
	350	* the output fields are not populated.
	351	*/
	352	int ustctl_recv_reg_msg(int sock,
	353	enum ustctl_socket_type *type,
	354	uint32_t *major,
	355	uint32_t *minor,
	356	uint32_t *pid,
	357	uint32_t *ppid,
	358	uint32_t *uid,
	359	uint32_t *gid,
	360	uint32_t *bits_per_long,
	361	uint32_t *uint8_t_alignment,
	362	uint32_t *uint16_t_alignment,
	363	uint32_t *uint32_t_alignment,
	364	uint32_t *uint64_t_alignment,
	365	uint32_t *long_alignment,
	366	int *byte_order,
	367	char name); / size LTTNG_UST_ABI_PROCNAME_LEN */
	368
	369	/*
	370	* Returns 0 on success, negative UST or system error value on error.
	371	* Receive the notification command. The "notify_cmd" can then be used
	372	* by the caller to find out which ustctl_recv_* function should be
	373	* called to receive the notification, and which ustctl_reply_* is
	374	* appropriate.
	375	*/
	376	int ustctl_recv_notify(int sock, enum ustctl_notify_cmd *notify_cmd);
	377
	378	/*
	379	* Returns 0 on success, negative UST or system error value on error.
	380	*/
	381	int ustctl_recv_register_event(int sock,
	382	int session_objd, / session descriptor (output) */
	383	int channel_objd, / channel descriptor (output) */
	384	char event_name, /
	385	* event name (output,
	386	* size LTTNG_UST_SYM_NAME_LEN)
	387	*/
	388	int *loglevel_value,
	389	char *signature, /
	390	* event signature
	391	* (output, dynamically
	392	* allocated, must be free(3)'d
	393	* by the caller if function
	394	* returns success.)
	395	*/
	396	size_t *nr_fields,
	397	struct ustctl_field **fields,
	398	char **model_emf_uri);
	399
	400	/*
	401	* Returns 0 on success, negative error value on error.
	402	*/
	403	int ustctl_reply_register_event(int sock,
	404	uint32_t id, /* event id (input) */
	405	int ret_code); /* return code. 0 ok, negative error */
	406
	407	/*
	408	* Returns 0 on success, negative UST or system error value on error.
	409	*/
	410	int ustctl_recv_register_enum(int sock,
	411	int *session_objd,
	412	char *enum_name,
	413	struct ustctl_enum_entry **entries,
	414	unsigned int *nr_entries);
	415
	416	/*
	417	* Returns 0 on success, negative error value on error.
	418	*/
	419	int ustctl_reply_register_enum(int sock,
	420	int64_t id, /* enum id (input) */
	421	int ret_code);
	422
	423	/*
	424	* Returns 0 on success, negative UST or system error value on error.
	425	*/
	426	int ustctl_recv_register_channel(int sock,
	427	int session_objd, / session descriptor (output) */
	428	int channel_objd, / channel descriptor (output) */
	429	size_t nr_fields, / context fields */
	430	struct ustctl_field **fields);
	431
	432	/*
	433	* Returns 0 on success, negative error value on error.
	434	*/
	435	int ustctl_reply_register_channel(int sock,
	436	uint32_t chan_id,
	437	enum ustctl_channel_header header_type,
	438	int ret_code); /* return code. 0 ok, negative error */
	439
	440	#endif /* _LTTNG_UST_CTL_H */