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

/*
 * Copyright (C) 2011 Julien Desfossez <julien.desfossez@polymtl.ca>
 * Copyright (C) 2011-2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 */

#ifndef LTTNG_UST_CTL_INTERNAL_H
#define LTTNG_UST_CTL_INTERNAL_H

#include <sys/types.h>
#include <limits.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 */
	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 */
	int64_t blocking_timeout;			/* Blocking timeout (usec) */
} 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_set_exclusion(int sock, struct lttng_ust_event_exclusion *exclusion,
		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;

int ustctl_get_nr_stream_per_channel(void);

struct ustctl_consumer_channel *
	ustctl_create_channel(struct ustctl_consumer_channel_attr *attr,
		const int *stream_fds, int nr_stream_fds);
/*
 * 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 */
ssize_t ustctl_write_one_packet_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_sample_positions(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);

/* index */
int ustctl_get_timestamp_begin(struct ustctl_consumer_stream *stream,
		uint64_t *timestamp_begin);
int ustctl_get_timestamp_end(struct ustctl_consumer_stream *stream,
	uint64_t *timestamp_end);
int ustctl_get_events_discarded(struct ustctl_consumer_stream *stream,
	uint64_t *events_discarded);
int ustctl_get_content_size(struct ustctl_consumer_stream *stream,
	uint64_t *content_size);
int ustctl_get_packet_size(struct ustctl_consumer_stream *stream,
	uint64_t *packet_size);
int ustctl_get_stream_id(struct ustctl_consumer_stream *stream,
		uint64_t *stream_id);
int ustctl_get_current_timestamp(struct ustctl_consumer_stream *stream,
		uint64_t *ts);
int ustctl_get_sequence_number(struct ustctl_consumer_stream *stream,
		uint64_t *seq);
int ustctl_get_instance_id(struct ustctl_consumer_stream *stream,
		uint64_t *id);

/* returns whether UST has perf counters support. */
int ustctl_has_perf_counters(void);

/* Regenerate the statedump. */
int ustctl_regenerate_statedump(int sock, int handle);

/* 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,
	ustctl_atype_variant,
	ustctl_atype_struct,
	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 */
	int32_t encoding;	/* enum ustctl_string_encodings */
	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;

enum ustctl_ust_enum_entry_options {
	USTCTL_UST_ENUM_ENTRY_OPTION_IS_AUTO = 1U << 0,
};

#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];
	union {
		struct {
			uint32_t options;
		} LTTNG_PACKED extra;
		char padding[USTCTL_UST_ENUM_ENTRY_PADDING];
	} u;
} LTTNG_PACKED;

#define USTCTL_UST_BASIC_TYPE_PADDING	296
union _ustctl_basic_type {
	struct ustctl_integer_type integer;
	struct {
		char name[LTTNG_UST_SYM_NAME_LEN];
		struct ustctl_integer_type container_type;
		uint64_t id;	/* enum ID in sessiond. */
	} enumeration;
	struct {
		int32_t encoding;	/* enum ustctl_string_encodings */
	} string;
	struct ustctl_float_type _float;
	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;
		struct {
			uint32_t nr_choices;
			char tag_name[LTTNG_UST_SYM_NAME_LEN];
			/* Followed by nr_choices struct ustctl_field. */
		} variant;
		struct {
			uint32_t nr_fields;
			/* Followed by nr_fields struct ustctl_field. */
		} _struct;
		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,
	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,
	size_t *nr_entries);

/*
 * Returns 0 on success, negative error value on error.
 */
int ustctl_reply_register_enum(int sock,
	uint64_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_INTERNAL_H */
Commit	Line	Data
75018ab6	1	/*
ab5be9fa MJ	2	* Copyright (C) 2011 Julien Desfossez <julien.desfossez@polymtl.ca>
ab5be9fa MJ	3	* Copyright (C) 2011-2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
75018ab6	4	*
ab5be9fa	5	* SPDX-License-Identifier: GPL-2.0-only
75018ab6	6	*
75018ab6 JG	7	*/
	8
	9	#ifndef LTTNG_UST_CTL_INTERNAL_H
	10	#define LTTNG_UST_CTL_INTERNAL_H
	11
	12	#include <sys/types.h>
	13	#include <limits.h>
	14
	15	#include "lttng-ust-abi.h"
	16
	17	#ifndef LTTNG_UST_UUID_LEN
	18	#define LTTNG_UST_UUID_LEN 16
	19	#endif
	20
	21	/* Default unix socket path */
	22	#define LTTNG_UST_SOCK_FILENAME \
	23	"lttng-ust-sock-" \
	24	__ust_stringify(LTTNG_UST_ABI_MAJOR_VERSION)
	25
	26	/*
	27	* Shared memory files path are automatically related to shm root, e.g.
	28	* /dev/shm under linux.
	29	*/
	30	#define LTTNG_UST_WAIT_FILENAME \
	31	"lttng-ust-wait-" \
	32	__ust_stringify(LTTNG_UST_ABI_MAJOR_VERSION)
	33
	34	struct lttng_ust_shm_handle;
	35	struct lttng_ust_lib_ring_buffer;
	36
	37	struct ustctl_consumer_channel_attr {
	38	enum lttng_ust_chan_type type;
	39	uint64_t subbuf_size; /* bytes */
	40	uint64_t num_subbuf; /* power of 2 */
	41	int overwrite; /* 1: overwrite, 0: discard */
	42	unsigned int switch_timer_interval; /* usec */
	43	unsigned int read_timer_interval; /* usec */
	44	enum lttng_ust_output output; /* splice, mmap */
	45	uint32_t chan_id; /* channel ID */
	46	unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */
	47	int64_t blocking_timeout; /* Blocking timeout (usec) */
	48	} LTTNG_PACKED;
	49
	50	/*
	51	* API used by sessiond.
	52	*/
	53
	54	struct lttng_ust_context_attr {
	55	enum lttng_ust_context_type ctx;
	56	union {
	57	struct lttng_ust_perf_counter_ctx perf_counter;
	58	struct {
	59	char *provider_name;
	60	char *ctx_name;
	61	} app_ctx;
	62	} u;
	63	};
	64
	65	/*
	66	* Error values: all the following functions return:
	67	* >= 0: Success (LTTNG_UST_OK)
	68	* < 0: error code.
	69	*/
	70	int ustctl_register_done(int sock);
71	int ustctl_create_session(int sock);
72	int ustctl_create_event(int sock, struct lttng_ust_event *ev,
73	struct lttng_ust_object_data *channel_data,
74	struct lttng_ust_object_data **event_data);
75	int ustctl_add_context(int sock, struct lttng_ust_context_attr *ctx,
76	struct lttng_ust_object_data *obj_data,
77	struct lttng_ust_object_data **context_data);
78	int ustctl_set_filter(int sock, struct lttng_ust_filter_bytecode *bytecode,
79	struct lttng_ust_object_data *obj_data);
80	int ustctl_set_exclusion(int sock, struct lttng_ust_event_exclusion *exclusion,
81	struct lttng_ust_object_data *obj_data);
82
83	int ustctl_enable(int sock, struct lttng_ust_object_data *object);
84	int ustctl_disable(int sock, struct lttng_ust_object_data *object);
85	int ustctl_start_session(int sock, int handle);
86	int ustctl_stop_session(int sock, int handle);
87
88	/*
89	* ustctl_tracepoint_list returns a tracepoint list handle, or negative
90	* error value.
91	*/
92	int ustctl_tracepoint_list(int sock);
93
94	/*
95	* ustctl_tracepoint_list_get is used to iterate on the tp list
96	* handle. End is iteration is reached when -LTTNG_UST_ERR_NOENT is
97	* returned.
98	*/
99	int ustctl_tracepoint_list_get(int sock, int tp_list_handle,
100	struct lttng_ust_tracepoint_iter *iter);
101
102	/*
103	* ustctl_tracepoint_field_list returns a tracepoint field list handle,
104	* or negative error value.
105	*/
106	int ustctl_tracepoint_field_list(int sock);
107
108	/*
109	* ustctl_tracepoint_field_list_get is used to iterate on the tp field
110	* list handle. End is iteration is reached when -LTTNG_UST_ERR_NOENT is
111	* returned.
112	*/
113	int ustctl_tracepoint_field_list_get(int sock, int tp_field_list_handle,
114	struct lttng_ust_field_iter *iter);
115
116	int ustctl_tracer_version(int sock, struct lttng_ust_tracer_version *v);
117	int ustctl_wait_quiescent(int sock);
118
119	int ustctl_sock_flush_buffer(int sock, struct lttng_ust_object_data *object);
120
121	int ustctl_calibrate(int sock, struct lttng_ust_calibrate *calibrate);
122
123	/* Release object created by members of this API. */
124	int ustctl_release_object(int sock, struct lttng_ust_object_data *data);
125	/* Release handle returned by create session. */
126	int ustctl_release_handle(int sock, int handle);
127
128	int ustctl_recv_channel_from_consumer(int sock,
129	struct lttng_ust_object_data **channel_data);
130	int ustctl_recv_stream_from_consumer(int sock,
131	struct lttng_ust_object_data **stream_data);
132	int ustctl_send_channel_to_ust(int sock, int session_handle,
133	struct lttng_ust_object_data *channel_data);
134	int ustctl_send_stream_to_ust(int sock,
135	struct lttng_ust_object_data *channel_data,
136	struct lttng_ust_object_data *stream_data);
137
138	/*
139	* ustctl_duplicate_ust_object_data allocated a new object in "dest" if
140	* it succeeds (returns 0). It must be released using
141	* ustctl_release_object() and then freed with free().
142	*/
143	int ustctl_duplicate_ust_object_data(struct lttng_ust_object_data **dest,
144	struct lttng_ust_object_data *src);
145
146	/*
147	* API used by consumer.
148	*/
149
150	struct ustctl_consumer_channel;
151	struct ustctl_consumer_stream;
152	struct ustctl_consumer_channel_attr;
153
154	int ustctl_get_nr_stream_per_channel(void);
155
156	struct ustctl_consumer_channel *
157	ustctl_create_channel(struct ustctl_consumer_channel_attr *attr,
158	const int *stream_fds, int nr_stream_fds);
159	/*
160	* Each stream created needs to be destroyed before calling
161	* ustctl_destroy_channel().
162	*/
163	void ustctl_destroy_channel(struct ustctl_consumer_channel *chan);
164
165	int ustctl_send_channel_to_sessiond(int sock,
166	struct ustctl_consumer_channel *channel);
167	int ustctl_channel_close_wait_fd(struct ustctl_consumer_channel *consumer_chan);
168	int ustctl_channel_close_wakeup_fd(struct ustctl_consumer_channel *consumer_chan);
169	int ustctl_channel_get_wait_fd(struct ustctl_consumer_channel *consumer_chan);
170	int ustctl_channel_get_wakeup_fd(struct ustctl_consumer_channel *consumer_chan);
171
172	int ustctl_write_metadata_to_channel(
173	struct ustctl_consumer_channel *channel,
174	const char metadata_str, / NOT null-terminated */
175	size_t len); /* metadata length */
176	ssize_t ustctl_write_one_packet_to_channel(
177	struct ustctl_consumer_channel *channel,
178	const char metadata_str, / NOT null-terminated */
179	size_t len); /* metadata length */
180
181	/*
182	* Send a NULL stream to finish iteration over all streams of a given
183	* channel.
184	*/
185	int ustctl_send_stream_to_sessiond(int sock,
186	struct ustctl_consumer_stream *stream);
187	int ustctl_stream_close_wait_fd(struct ustctl_consumer_stream *stream);
188	int ustctl_stream_close_wakeup_fd(struct ustctl_consumer_stream *stream);
189	int ustctl_stream_get_wait_fd(struct ustctl_consumer_stream *stream);
190	int ustctl_stream_get_wakeup_fd(struct ustctl_consumer_stream *stream);
191
192	/* Create/destroy stream buffers for read */
193	struct ustctl_consumer_stream *
194	ustctl_create_stream(struct ustctl_consumer_channel *channel,
195	int cpu);
196	void ustctl_destroy_stream(struct ustctl_consumer_stream *stream);
197
198	/* For mmap mode, readable without "get" operation */
199	int ustctl_get_mmap_len(struct ustctl_consumer_stream *stream,
200	unsigned long *len);
201	int ustctl_get_max_subbuf_size(struct ustctl_consumer_stream *stream,
202	unsigned long *len);
203
204	/*
205	* For mmap mode, operate on the current packet (between get/put or
206	* get_next/put_next).
207	*/
208	void ustctl_get_mmap_base(struct ustctl_consumer_stream stream);
209	int ustctl_get_mmap_read_offset(struct ustctl_consumer_stream *stream,
210	unsigned long *off);
211	int ustctl_get_subbuf_size(struct ustctl_consumer_stream *stream,
212	unsigned long *len);
213	int ustctl_get_padded_subbuf_size(struct ustctl_consumer_stream *stream,
214	unsigned long *len);
215	int ustctl_get_next_subbuf(struct ustctl_consumer_stream *stream);
216	int ustctl_put_next_subbuf(struct ustctl_consumer_stream *stream);
217
218	/* snapshot */
219
220	int ustctl_snapshot(struct ustctl_consumer_stream *stream);
221	int ustctl_snapshot_sample_positions(struct ustctl_consumer_stream *stream);
222	int ustctl_snapshot_get_consumed(struct ustctl_consumer_stream *stream,
223	unsigned long *pos);
224	int ustctl_snapshot_get_produced(struct ustctl_consumer_stream *stream,
225	unsigned long *pos);
226	int ustctl_get_subbuf(struct ustctl_consumer_stream *stream,
227	unsigned long *pos);
228	int ustctl_put_subbuf(struct ustctl_consumer_stream *stream);
229
230	void ustctl_flush_buffer(struct ustctl_consumer_stream *stream,
231	int producer_active);
232
233	/* index */
234	int ustctl_get_timestamp_begin(struct ustctl_consumer_stream *stream,
235	uint64_t *timestamp_begin);
236	int ustctl_get_timestamp_end(struct ustctl_consumer_stream *stream,
237	uint64_t *timestamp_end);
238	int ustctl_get_events_discarded(struct ustctl_consumer_stream *stream,
239	uint64_t *events_discarded);
240	int ustctl_get_content_size(struct ustctl_consumer_stream *stream,
241	uint64_t *content_size);
242	int ustctl_get_packet_size(struct ustctl_consumer_stream *stream,
243	uint64_t *packet_size);
244	int ustctl_get_stream_id(struct ustctl_consumer_stream *stream,
245	uint64_t *stream_id);
246	int ustctl_get_current_timestamp(struct ustctl_consumer_stream *stream,
247	uint64_t *ts);
248	int ustctl_get_sequence_number(struct ustctl_consumer_stream *stream,
249	uint64_t *seq);
250	int ustctl_get_instance_id(struct ustctl_consumer_stream *stream,
251	uint64_t *id);
252
253	/* returns whether UST has perf counters support. */
254	int ustctl_has_perf_counters(void);
255
256	/* Regenerate the statedump. */
257	int ustctl_regenerate_statedump(int sock, int handle);
258
259	/* event registry management */
260
261	enum ustctl_socket_type {
262	USTCTL_SOCKET_CMD = 0,
263	USTCTL_SOCKET_NOTIFY = 1,
264	};
265
266	enum ustctl_notify_cmd {
267	USTCTL_NOTIFY_CMD_EVENT = 0,
268	USTCTL_NOTIFY_CMD_CHANNEL = 1,
269	USTCTL_NOTIFY_CMD_ENUM = 2,
270	};
271
272	enum ustctl_channel_header {
273	USTCTL_CHANNEL_HEADER_UNKNOWN = 0,
274	USTCTL_CHANNEL_HEADER_COMPACT = 1,
275	USTCTL_CHANNEL_HEADER_LARGE = 2,
276	};
277
278	/* event type structures */
279
280	enum ustctl_abstract_types {
281	ustctl_atype_integer,
282	ustctl_atype_enum,
283	ustctl_atype_array,
284	ustctl_atype_sequence,
285	ustctl_atype_string,
286	ustctl_atype_float,
287	ustctl_atype_variant,
288	ustctl_atype_struct,
289	NR_USTCTL_ABSTRACT_TYPES,
290	};
291
292	enum ustctl_string_encodings {
293	ustctl_encode_none = 0,
294	ustctl_encode_UTF8 = 1,
295	ustctl_encode_ASCII = 2,
296	NR_USTCTL_STRING_ENCODINGS,
297	};
298
299	#define USTCTL_UST_INTEGER_TYPE_PADDING 24
300	struct ustctl_integer_type {
301	uint32_t size; /* in bits */
302	uint32_t signedness;
303	uint32_t reverse_byte_order;
304	uint32_t base; /* 2, 8, 10, 16, for pretty print */
305	int32_t encoding; /* enum ustctl_string_encodings */
306	uint16_t alignment; /* in bits */
307	char padding[USTCTL_UST_INTEGER_TYPE_PADDING];
308	} LTTNG_PACKED;
309
310	#define USTCTL_UST_FLOAT_TYPE_PADDING 24
311	struct ustctl_float_type {
312	uint32_t exp_dig; /* exponent digits, in bits */
313	uint32_t mant_dig; /* mantissa digits, in bits */
314	uint32_t reverse_byte_order;
315	uint16_t alignment; /* in bits */
316	char padding[USTCTL_UST_FLOAT_TYPE_PADDING];
317	} LTTNG_PACKED;
318
319	#define USTCTL_UST_ENUM_VALUE_PADDING 15
320	struct ustctl_enum_value {
321	uint64_t value;
322	uint8_t signedness;
323	char padding[USTCTL_UST_ENUM_VALUE_PADDING];
324	} LTTNG_PACKED;
325
326	enum ustctl_ust_enum_entry_options {
327	USTCTL_UST_ENUM_ENTRY_OPTION_IS_AUTO = 1U << 0,
328	};
329
330	#define USTCTL_UST_ENUM_ENTRY_PADDING 32
331	struct ustctl_enum_entry {
332	struct ustctl_enum_value start, end; /* start and end are inclusive */
333	char string[LTTNG_UST_SYM_NAME_LEN];
334	union {
335	struct {
336	uint32_t options;
337	} LTTNG_PACKED extra;
338	char padding[USTCTL_UST_ENUM_ENTRY_PADDING];
339	} u;
340	} LTTNG_PACKED;
341
342	#define USTCTL_UST_BASIC_TYPE_PADDING 296
343	union _ustctl_basic_type {
344	struct ustctl_integer_type integer;
345	struct {
346	char name[LTTNG_UST_SYM_NAME_LEN];
347	struct ustctl_integer_type container_type;
348	uint64_t id; /* enum ID in sessiond. */
349	} enumeration;
350	struct {
351	int32_t encoding; /* enum ustctl_string_encodings */
352	} string;
353	struct ustctl_float_type _float;
354	char padding[USTCTL_UST_BASIC_TYPE_PADDING];
355	} LTTNG_PACKED;
356
357	struct ustctl_basic_type {
358	enum ustctl_abstract_types atype;
359	union {
360	union _ustctl_basic_type basic;
361	} u;
362	} LTTNG_PACKED;
363
364	#define USTCTL_UST_TYPE_PADDING 128
365	struct ustctl_type {
366	enum ustctl_abstract_types atype;
367	union {
368	union _ustctl_basic_type basic;
369	struct {
370	struct ustctl_basic_type elem_type;
371	uint32_t length; /* num. elems. */
372	} array;
373	struct {
374	struct ustctl_basic_type length_type;
375	struct ustctl_basic_type elem_type;
376	} sequence;
377	struct {
378	uint32_t nr_choices;
379	char tag_name[LTTNG_UST_SYM_NAME_LEN];
380	/* Followed by nr_choices struct ustctl_field. */
381	} variant;
382	struct {
383	uint32_t nr_fields;
384	/* Followed by nr_fields struct ustctl_field. */
385	} _struct;
386	char padding[USTCTL_UST_TYPE_PADDING];
387	} u;
388	} LTTNG_PACKED;
389
390	#define USTCTL_UST_FIELD_PADDING 28
391	struct ustctl_field {
392	char name[LTTNG_UST_SYM_NAME_LEN];
393	struct ustctl_type type;
394	char padding[USTCTL_UST_FIELD_PADDING];
395	} LTTNG_PACKED;
396
397	/*
398	* Returns 0 on success, negative error value on error.
399	* If an error other than -LTTNG_UST_ERR_UNSUP_MAJOR is returned,
400	* the output fields are not populated.
401	*/
402	int ustctl_recv_reg_msg(int sock,
403	enum ustctl_socket_type *type,
404	uint32_t *major,
405	uint32_t *minor,
406	uint32_t *pid,
407	uint32_t *ppid,
408	uint32_t *uid,
409	uint32_t *gid,
410	uint32_t *bits_per_long,
411	uint32_t *uint8_t_alignment,
412	uint32_t *uint16_t_alignment,
413	uint32_t *uint32_t_alignment,
414	uint32_t *uint64_t_alignment,
415	uint32_t *long_alignment,
416	int *byte_order,
417	char name); / size LTTNG_UST_ABI_PROCNAME_LEN */
418
419	/*
420	* Returns 0 on success, negative UST or system error value on error.
421	* Receive the notification command. The "notify_cmd" can then be used
422	* by the caller to find out which ustctl_recv_* function should be
423	* called to receive the notification, and which ustctl_reply_* is
424	* appropriate.
425	*/
426	int ustctl_recv_notify(int sock, enum ustctl_notify_cmd *notify_cmd);
427
428	/*
429	* Returns 0 on success, negative UST or system error value on error.
430	*/
431	int ustctl_recv_register_event(int sock,
432	int session_objd, / session descriptor (output) */
433	int channel_objd, / channel descriptor (output) */
434	char event_name, /
435	* event name (output,
436	* size LTTNG_UST_SYM_NAME_LEN)
437	*/
438	int *loglevel,
439	char *signature, /
440	* event signature
441	* (output, dynamically
442	* allocated, must be free(3)'d
443	* by the caller if function
444	* returns success.)
445	*/
446	size_t *nr_fields,
447	struct ustctl_field **fields,
448	char **model_emf_uri);
449
450	/*
451	* Returns 0 on success, negative error value on error.
452	*/
453	int ustctl_reply_register_event(int sock,
454	uint32_t id, /* event id (input) */
455	int ret_code); /* return code. 0 ok, negative error */
456
457	/*
458	* Returns 0 on success, negative UST or system error value on error.
459	*/
460	int ustctl_recv_register_enum(int sock,
461	int *session_objd,
462	char *enum_name,
463	struct ustctl_enum_entry **entries,
464	size_t *nr_entries);
465
466	/*
467	* Returns 0 on success, negative error value on error.
468	*/
469	int ustctl_reply_register_enum(int sock,
470	uint64_t id, /* enum id (input) */
471	int ret_code);
472
473	/*
474	* Returns 0 on success, negative UST or system error value on error.
475	*/
476	int ustctl_recv_register_channel(int sock,
477	int session_objd, / session descriptor (output) */
478	int channel_objd, / channel descriptor (output) */
479	size_t nr_fields, / context fields */
480	struct ustctl_field **fields);
481
482	/*
483	* Returns 0 on success, negative error value on error.
484	*/
485	int ustctl_reply_register_channel(int sock,
486	uint32_t chan_id,
487	enum ustctl_channel_header header_type,
488	int ret_code); /* return code. 0 ok, negative error */
489
490	#endif /* LTTNG_UST_CTL_INTERNAL_H */