[lttng-tools.git] / src / common / sessiond-comm / relayd.hpp

/*
 * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
 * Copyright (C) 2012 Julien Desfossez <julien.desfossez@efficios.com>
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 */

#ifndef _RELAYD_COMM
#define _RELAYD_COMM

#include <limits.h>
#include <stdint.h>

#include <lttng/lttng.h>
#include <common/defaults.hpp>
#include <common/index/ctf-index.hpp>
#include <common/macros.hpp>
#include <common/uuid.hpp>
#include <common/optional.hpp>

#define RELAYD_VERSION_COMM_MAJOR             VERSION_MAJOR
/* FIXME: remove, SPOOFING VERSION as 2.15 */
//#define RELAYD_VERSION_COMM_MINOR             VERSION_MINOR
#define RELAYD_VERSION_COMM_MINOR             15

#define RELAYD_COMM_LTTNG_HOST_NAME_MAX_2_4	64
#define RELAYD_COMM_LTTNG_NAME_MAX_2_4	255
#define RELAYD_COMM_LTTNG_PATH_MAX	4096
#define RELAYD_COMM_DEFAULT_STREAM_NAME_LEN	264 /* 256 + 8 */

/*
 * lttng-relayd communication header.
 */
struct lttcomm_relayd_hdr {
	/* Circuit ID not used for now so always ignored */
	uint64_t circuit_id;
	uint64_t data_size;		/* data size following this header */
	uint32_t cmd;			/* enum lttcomm_relayd_command */
	uint32_t cmd_version;	/* command version */
} LTTNG_PACKED;

/*
 * lttng-relayd data header.
 */
struct lttcomm_relayd_data_hdr {
	/* Circuit ID not used for now so always ignored */
	uint64_t circuit_id;
	uint64_t stream_id;     /* Stream ID known by the relayd */
	uint64_t net_seq_num;   /* Network sequence number, per stream. */
	uint32_t data_size;     /* data size following this header */
	uint32_t padding_size;  /* Size of 0 padding the data */
} LTTNG_PACKED;

/*
 * Reply from a create session command.
 */
struct lttcomm_relayd_status_session {
	uint64_t session_id;
	uint32_t ret_code;
} LTTNG_PACKED;

/*
 * Used to add a stream on the relay daemon.
 */
struct lttcomm_relayd_add_stream {
	char channel_name[RELAYD_COMM_DEFAULT_STREAM_NAME_LEN];
	char pathname[RELAYD_COMM_LTTNG_PATH_MAX];
} LTTNG_PACKED;

/*
 * Used to add a stream on the relay daemon.
 * Protocol version 2.2
 */
struct lttcomm_relayd_add_stream_2_2 {
	char channel_name[RELAYD_COMM_DEFAULT_STREAM_NAME_LEN];
	char pathname[RELAYD_COMM_LTTNG_PATH_MAX];
	uint64_t tracefile_size;
	uint64_t tracefile_count;
} LTTNG_PACKED;

struct lttcomm_relayd_add_stream_2_11 {
	uint32_t channel_name_len;
	uint32_t pathname_len;
	uint64_t tracefile_size;
	uint64_t tracefile_count;
	uint64_t trace_chunk_id;
	char names[];
} LTTNG_PACKED;

/*
 * Answer from an add stream command.
 */
struct lttcomm_relayd_status_stream {
	uint64_t handle;
	uint32_t ret_code;
} LTTNG_PACKED;

/*
 * Used to return command code for command not needing special data.
 */
struct lttcomm_relayd_generic_reply {
	uint32_t ret_code;
} LTTNG_PACKED;

/*
 * Version command.
 */
struct lttcomm_relayd_version {
	uint32_t major;
	uint32_t minor;
} LTTNG_PACKED;

/*
 * Metadata payload used when metadata command is sent.
 */
struct lttcomm_relayd_metadata_payload {
	uint64_t stream_id;
	uint32_t padding_size;
	char payload[];
} LTTNG_PACKED;

/*
 * Used to indicate that a specific stream id can now be closed.
 */
struct lttcomm_relayd_close_stream {
	uint64_t stream_id;
	uint64_t last_net_seq_num;	/* sequence number of last packet */
} LTTNG_PACKED;

/*
 * Used to test if for a given stream id the data is pending on the relayd side
 * for reading.
 */
struct lttcomm_relayd_data_pending {
	uint64_t stream_id;
	uint64_t last_net_seq_num; /* Sequence number of the last packet */
} LTTNG_PACKED;

struct lttcomm_relayd_begin_data_pending {
	uint64_t session_id;
} LTTNG_PACKED;

struct lttcomm_relayd_end_data_pending {
	uint64_t session_id;
} LTTNG_PACKED;

struct lttcomm_relayd_quiescent_control {
	uint64_t stream_id;
} LTTNG_PACKED;

/*
 * Index data.
 */
struct lttcomm_relayd_index {
	uint64_t relay_stream_id;
	uint64_t net_seq_num;
	uint64_t packet_size;
	uint64_t content_size;
	uint64_t timestamp_begin;
	uint64_t timestamp_end;
	uint64_t events_discarded;
	uint64_t stream_id;
	/* 2.8+ */
	uint64_t stream_instance_id;
	uint64_t packet_seq_num;
} LTTNG_PACKED;

static inline size_t lttcomm_relayd_index_len(uint32_t major, uint32_t minor)
{
	if (major == 1) {
		switch (minor) {
		case 0:
			return offsetof(struct lttcomm_relayd_index, stream_id)
				+ member_sizeof(struct lttcomm_relayd_index,
						stream_id);
		case 1:
			return offsetof(struct lttcomm_relayd_index, packet_seq_num)
				+ member_sizeof(struct lttcomm_relayd_index,
						packet_seq_num);
		default:
			abort();
		}
	}
	abort();
}

/*
 * Create session in 2.4 adds additionnal parameters for live reading.
 */
struct lttcomm_relayd_create_session_2_4 {
	char session_name[RELAYD_COMM_LTTNG_NAME_MAX_2_4];
	char hostname[RELAYD_COMM_LTTNG_HOST_NAME_MAX_2_4];
	uint32_t live_timer;
	uint32_t snapshot;
} LTTNG_PACKED;

struct lttcomm_relayd_create_session_2_11 {
	uint32_t session_name_len;
	uint32_t hostname_len;
	/* Optional, set to 0 to indicate it is not user-specified. */
	uint32_t base_path_len;
	uint32_t live_timer;
	uint8_t snapshot;
	uint8_t session_name_contains_creation_time;
	/* Sessiond instance UUID */
	uint8_t sessiond_uuid[LTTNG_UUID_LEN];
	/* Sessiond session id */
	uint64_t session_id;
	/* Session creation time, in seconds since UNIX Epoch. */
	uint64_t creation_time;
	LTTNG_OPTIONAL_COMM(uint64_t) LTTNG_PACKED current_chunk_id;
	/* Contains the session_name, hostname, base_path. */
	char names[];
} LTTNG_PACKED;

struct lttcomm_relayd_create_session_reply_2_11 {
	struct lttcomm_relayd_status_session generic;
	/* Includes the '\0' terminator. */
	uint32_t output_path_length;
	char output_path[];
} LTTNG_PACKED;

/*
 * Used to ask the relay to reset the metadata trace file (regeneration).
 * Send the new version of the metadata (starts at 0).
 */
struct lttcomm_relayd_reset_metadata {
	uint64_t stream_id;
	uint64_t version;
} LTTNG_PACKED;

struct lttcomm_relayd_stream_rotation_position {
	uint64_t stream_id;
	/*
	 * Sequence number of the first packet belonging to the new
	 * "destination" trace chunk to which the stream is rotating.
	 *
	 * Ignored for metadata streams.
	 */
	uint64_t rotate_at_seq_num;
} LTTNG_PACKED;

/*
 * For certain releases, the LTTNG_PACKED annotation was missing on the
 * `new_chunk_id` field which causes padding to be added between the
 * "optional" structure's `is_set` and `value` fields.
 *
 * Three alignment cases are handled:
 *   - `value` is aligned to the next byte boundary after `is_set`
 *     no padding is produced, see
 *     `struct lttcomm_relayd_rotate_streams_packed`,
 *   - `value` is aligned to the next 4-byte boundary after `is_set`
 *     (e.g. x86), 3 bytes of padding are produced, see
 *     `struct lttcomm_relayd_rotate_streams_3_bytes_padding`,
 *   - `value` is aligned to the next 8-byte boundary after `is_set`
 *     (e.g. x86-64), 7 bytes of padding are produced, see
 *     `struct lttcomm_relayd_rotate_streams_7_bytes_padding`.
 *
 * Note that since this structure's advertised size is used to determine
 * the size of the padding it includes, it can't be extended with new
 * optional fields. A new command would be needed.
 */
struct lttcomm_relayd_rotate_streams {
	uint32_t stream_count;
	/*
	 * Streams can be rotated outside of a chunk but not be parented to
	 * a new chunk.
	 *
	 * Improperly packed, but left as-is for backwards compatibility
	 * with unpatched relay daemons.
	 */
	LTTNG_OPTIONAL_COMM(uint64_t) new_chunk_id;
	/* `stream_count` positions follow. */
	struct lttcomm_relayd_stream_rotation_position rotation_positions[];
} LTTNG_PACKED;

struct lttcomm_relayd_rotate_streams_packed {
	uint32_t stream_count;
	LTTNG_OPTIONAL_COMM(uint64_t) LTTNG_PACKED new_chunk_id;
	struct lttcomm_relayd_stream_rotation_position rotation_positions[];
} LTTNG_PACKED;

struct lttcomm_relayd_rotate_streams_3_bytes_padding {
	uint32_t stream_count;
	struct {
		union {
			uint8_t is_set;
			uint32_t padding;
		};
		uint64_t value;
	} LTTNG_PACKED new_chunk_id;
	struct lttcomm_relayd_stream_rotation_position rotation_positions[];
} LTTNG_PACKED;

struct lttcomm_relayd_rotate_streams_7_bytes_padding {
	uint32_t stream_count;
	struct {
		union {
			uint8_t is_set;
			uint64_t padding;
		};
		uint64_t value;
	} LTTNG_PACKED new_chunk_id;
	struct lttcomm_relayd_stream_rotation_position rotation_positions[];
} LTTNG_PACKED;

struct lttcomm_relayd_create_trace_chunk {
	uint64_t chunk_id;
	/* Seconds since EPOCH. */
	uint64_t creation_timestamp;
	/* Includes trailing NULL. */
	uint32_t override_name_length;
	char override_name[];
} LTTNG_PACKED;

struct lttcomm_relayd_close_trace_chunk {
	uint64_t chunk_id;
	/* Seconds since EPOCH. */
	uint64_t close_timestamp;
	/* enum lttng_trace_chunk_command_type */
	LTTNG_OPTIONAL_COMM(uint32_t) LTTNG_PACKED close_command;
} LTTNG_PACKED;

struct lttcomm_relayd_close_trace_chunk_reply {
	struct lttcomm_relayd_generic_reply generic;
	/* Includes trailing NULL. */
	uint32_t path_length;
	char path[];
} LTTNG_PACKED;

struct lttcomm_relayd_trace_chunk_exists {
	uint64_t chunk_id;
} LTTNG_PACKED;

struct lttcomm_relayd_trace_chunk_exists_reply {
	struct lttcomm_relayd_generic_reply generic;
	uint8_t trace_chunk_exists;
} LTTNG_PACKED;

enum lttcomm_relayd_configuration_flag {
	/* The relay daemon (2.12) is configured to allow clear operations. */
	LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED = (1 << 0),
};

enum lttcomm_relayd_configuration_query_flag {
	LTTCOMM_RELAYD_CONFIGURATION_QUERY_FLAG_SUPPORTED_TRACE_FORMAT = (1 << 0),
	LTTCOMM_RELAYD_CONFIGURATION_QUERY_FLAG_MASK = 0x01
};

enum lttcomm_relayd_configuration_trace_format_flag {
	LTTCOMM_RELAYD_CONFIGURATION_TRACE_FORMAT_SUPPORTED_CTF1 = (1 << 0),
	LTTCOMM_RELAYD_CONFIGURATION_TRACE_FORMAT_SUPPORTED_CTF2 = (1 << 1)
};

struct lttcomm_relayd_get_configuration {
	uint64_t query_flags;
} LTTNG_PACKED;

struct lttcomm_relayd_get_configuration_specialized_query_reply {
	uint64_t query_flag; // Single flag, enum lttcomm_relayd_configuration_trace_format_flag
	uint64_t payload_len;
	/*
	 * Payload dependant on type
	 * LTTCOMM_RELAYD_CONFIGURATION_QUERY_FLAG_SUPPORTED_TRACE_FORMAT:
	 *    uint64_t, bitfield of lttcomm_relayd_configuration_trace_format_flag.
	 */
	char payload[];
} LTTNG_PACKED;
/*
 * Used to return a relay daemon's configuration in reply to the
 * RELAYD_GET_CONFIGURATION command.
 */
struct lttcomm_relayd_get_configuration_reply {
	struct lttcomm_relayd_generic_reply generic;
	/* Set of lttcomm_relayd_configuration_flag. */
	uint64_t relayd_configuration_flags;
	/*
	 * Optional variable-length payload.
	 * When N query flags are used, it is expected that N dynamic sized
	 * lttcomm_relayd_get_configuration_specialized_query_reply be present.
	 */
	char payload[];
} LTTNG_PACKED;

#endif	/* _RELAYD_COMM */
Commit	Line	Data
b8aa1682	1	/*
ab5be9fa MJ	2	* Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
ab5be9fa MJ	3	* Copyright (C) 2012 Julien Desfossez <julien.desfossez@efficios.com>
b8aa1682	4	*
ab5be9fa	5	* SPDX-License-Identifier: GPL-2.0-only
b8aa1682	6	*
b8aa1682 JD	7	*/
	8
	9	#ifndef _RELAYD_COMM
	10	#define _RELAYD_COMM
	11
b8aa1682 JD	12	#include <limits.h>
	13	#include <stdint.h>
	14
	15	#include <lttng/lttng.h>
c9e313bc SM	16	#include <common/defaults.hpp>
	17	#include <common/index/ctf-index.hpp>
	18	#include <common/macros.hpp>
	19	#include <common/uuid.hpp>
	20	#include <common/optional.hpp>
b8aa1682	21
6947778e	22	#define RELAYD_VERSION_COMM_MAJOR VERSION_MAJOR
026a8516 JR	23	/* FIXME: remove, SPOOFING VERSION as 2.15 */
	24	//#define RELAYD_VERSION_COMM_MINOR VERSION_MINOR
	25	#define RELAYD_VERSION_COMM_MINOR 15
0a6b5085	26
1c17e424 JR	27	#define RELAYD_COMM_LTTNG_HOST_NAME_MAX_2_4 64
	28	#define RELAYD_COMM_LTTNG_NAME_MAX_2_4 255
	29	#define RELAYD_COMM_LTTNG_PATH_MAX 4096
	30	#define RELAYD_COMM_DEFAULT_STREAM_NAME_LEN 264 /* 256 + 8 */
	31
b8aa1682 JD	32	/*
	33	* lttng-relayd communication header.
	34	*/
	35	struct lttcomm_relayd_hdr {
	36	/* Circuit ID not used for now so always ignored */
	37	uint64_t circuit_id;
	38	uint64_t data_size; /* data size following this header */
7c9534d6	39	uint32_t cmd; /* enum lttcomm_relayd_command */
b8aa1682	40	uint32_t cmd_version; /* command version */
a9e87764	41	} LTTNG_PACKED;
b8aa1682 JD	42
	43	/*
	44	* lttng-relayd data header.
	45	*/
	46	struct lttcomm_relayd_data_hdr {
	47	/* Circuit ID not used for now so always ignored */
	48	uint64_t circuit_id;
	49	uint64_t stream_id; /* Stream ID known by the relayd */
173af62f	50	uint64_t net_seq_num; /* Network sequence number, per stream. */
b8aa1682	51	uint32_t data_size; /* data size following this header */
1d4dfdef	52	uint32_t padding_size; /* Size of 0 padding the data */
a9e87764	53	} LTTNG_PACKED;
b8aa1682	54
c5b6f4f0 DG	55	/*
	56	* Reply from a create session command.
	57	*/
	58	struct lttcomm_relayd_status_session {
	59	uint64_t session_id;
	60	uint32_t ret_code;
a9e87764	61	} LTTNG_PACKED;
c5b6f4f0	62
b8aa1682 JD	63	/*
	64	* Used to add a stream on the relay daemon.
	65	*/
	66	struct lttcomm_relayd_add_stream {
1c17e424 JR	67	char channel_name[RELAYD_COMM_DEFAULT_STREAM_NAME_LEN];
1c17e424 JR	68	char pathname[RELAYD_COMM_LTTNG_PATH_MAX];
a9e87764	69	} LTTNG_PACKED;
b8aa1682	70
0f907de1 JD	71	/*
	72	* Used to add a stream on the relay daemon.
	73	* Protocol version 2.2
	74	*/
	75	struct lttcomm_relayd_add_stream_2_2 {
1c17e424 JR	76	char channel_name[RELAYD_COMM_DEFAULT_STREAM_NAME_LEN];
1c17e424 JR	77	char pathname[RELAYD_COMM_LTTNG_PATH_MAX];
0f907de1 JD	78	uint64_t tracefile_size;
	79	uint64_t tracefile_count;
	80	} LTTNG_PACKED;
	81
2f21a469 JR	82	struct lttcomm_relayd_add_stream_2_11 {
	83	uint32_t channel_name_len;
	84	uint32_t pathname_len;
	85	uint64_t tracefile_size;
	86	uint64_t tracefile_count;
348a81dc	87	uint64_t trace_chunk_id;
2f21a469 JR	88	char names[];
	89	} LTTNG_PACKED;
	90
b8aa1682 JD	91	/*
	92	* Answer from an add stream command.
	93	*/
	94	struct lttcomm_relayd_status_stream {
	95	uint64_t handle;
	96	uint32_t ret_code;
a9e87764	97	} LTTNG_PACKED;
b8aa1682 JD	98
	99	/*
	100	* Used to return command code for command not needing special data.
	101	*/
	102	struct lttcomm_relayd_generic_reply {
	103	uint32_t ret_code;
a9e87764	104	} LTTNG_PACKED;
b8aa1682	105
b8aa1682 JD	106	/*
	107	* Version command.
	108	*/
	109	struct lttcomm_relayd_version {
	110	uint32_t major;
	111	uint32_t minor;
a9e87764	112	} LTTNG_PACKED;
b8aa1682 JD	113
	114	/*
	115	* Metadata payload used when metadata command is sent.
	116	*/
	117	struct lttcomm_relayd_metadata_payload {
	118	uint64_t stream_id;
1d4dfdef	119	uint32_t padding_size;
b8aa1682	120	char payload[];
a9e87764	121	} LTTNG_PACKED;
b8aa1682	122
173af62f DG	123	/*
	124	* Used to indicate that a specific stream id can now be closed.
	125	*/
	126	struct lttcomm_relayd_close_stream {
	127	uint64_t stream_id;
	128	uint64_t last_net_seq_num; /* sequence number of last packet */
a9e87764	129	} LTTNG_PACKED;
173af62f	130
c8f59ee5	131	/*
6d805429 DG	132	* Used to test if for a given stream id the data is pending on the relayd side
6d805429 DG	133	* for reading.
c8f59ee5	134	*/
6d805429	135	struct lttcomm_relayd_data_pending {
c8f59ee5 DG	136	uint64_t stream_id;
c8f59ee5 DG	137	uint64_t last_net_seq_num; /* Sequence number of the last packet */
a9e87764	138	} LTTNG_PACKED;
c8f59ee5	139
f7079f67 DG	140	struct lttcomm_relayd_begin_data_pending {
f7079f67 DG	141	uint64_t session_id;
a9e87764	142	} LTTNG_PACKED;
f7079f67 DG	143
	144	struct lttcomm_relayd_end_data_pending {
	145	uint64_t session_id;
a9e87764	146	} LTTNG_PACKED;
f7079f67	147
ad7051c0 DG	148	struct lttcomm_relayd_quiescent_control {
	149	uint64_t stream_id;
	150	} LTTNG_PACKED;
	151
1c20f0e2 JD	152	/*
	153	* Index data.
	154	*/
	155	struct lttcomm_relayd_index {
	156	uint64_t relay_stream_id;
	157	uint64_t net_seq_num;
	158	uint64_t packet_size;
	159	uint64_t content_size;
	160	uint64_t timestamp_begin;
	161	uint64_t timestamp_end;
	162	uint64_t events_discarded;
	163	uint64_t stream_id;
f8f3885c	164	/* 2.8+ */
234cd636 JD	165	uint64_t stream_instance_id;
234cd636 JD	166	uint64_t packet_seq_num;
1c20f0e2 JD	167	} LTTNG_PACKED;
1c20f0e2 JD	168
f8f3885c MD	169	static inline size_t lttcomm_relayd_index_len(uint32_t major, uint32_t minor)
	170	{
	171	if (major == 1) {
	172	switch (minor) {
	173	case 0:
	174	return offsetof(struct lttcomm_relayd_index, stream_id)
	175	+ member_sizeof(struct lttcomm_relayd_index,
	176	stream_id);
	177	case 1:
	178	return offsetof(struct lttcomm_relayd_index, packet_seq_num)
	179	+ member_sizeof(struct lttcomm_relayd_index,
	180	packet_seq_num);
	181	default:
	182	abort();
	183	}
	184	}
	185	abort();
	186	}
	187
d3e2ba59 JD	188	/*
	189	* Create session in 2.4 adds additionnal parameters for live reading.
	190	*/
	191	struct lttcomm_relayd_create_session_2_4 {
1c17e424 JR	192	char session_name[RELAYD_COMM_LTTNG_NAME_MAX_2_4];
1c17e424 JR	193	char hostname[RELAYD_COMM_LTTNG_HOST_NAME_MAX_2_4];
d3e2ba59	194	uint32_t live_timer;
7d2f7452	195	uint32_t snapshot;
d3e2ba59 JD	196	} LTTNG_PACKED;
d3e2ba59 JD	197
f86f6389 JR	198	struct lttcomm_relayd_create_session_2_11 {
	199	uint32_t session_name_len;
	200	uint32_t hostname_len;
6fa5fe7c MD	201	/* Optional, set to 0 to indicate it is not user-specified. */
6fa5fe7c MD	202	uint32_t base_path_len;
f86f6389 JR	203	uint32_t live_timer;
f86f6389 JR	204	uint8_t snapshot;
46ef2188	205	uint8_t session_name_contains_creation_time;
658f12fa	206	/* Sessiond instance UUID */
328c2fe7	207	uint8_t sessiond_uuid[LTTNG_UUID_LEN];
658f12fa	208	/* Sessiond session id */
d3219302	209	uint64_t session_id;
db1da059 JG	210	/* Session creation time, in seconds since UNIX Epoch. */
	211	uint64_t creation_time;
	212	LTTNG_OPTIONAL_COMM(uint64_t) LTTNG_PACKED current_chunk_id;
6fa5fe7c	213	/* Contains the session_name, hostname, base_path. */
f86f6389 JR	214	char names[];
	215	} LTTNG_PACKED;
	216
ecd1a12f MD	217	struct lttcomm_relayd_create_session_reply_2_11 {
	218	struct lttcomm_relayd_status_session generic;
	219	/* Includes the '\0' terminator. */
	220	uint32_t output_path_length;
	221	char output_path[];
	222	} LTTNG_PACKED;
	223
93ec662e JD	224	/*
	225	* Used to ask the relay to reset the metadata trace file (regeneration).
	226	* Send the new version of the metadata (starts at 0).
	227	*/
	228	struct lttcomm_relayd_reset_metadata {
	229	uint64_t stream_id;
	230	uint64_t version;
	231	} LTTNG_PACKED;
	232
c35f9726	233	struct lttcomm_relayd_stream_rotation_position {
d3ecc550	234	uint64_t stream_id;
c35f9726 JG	235	/*
	236	* Sequence number of the first packet belonging to the new
	237	* "destination" trace chunk to which the stream is rotating.
	238	*
	239	* Ignored for metadata streams.
	240	*/
d3ecc550	241	uint64_t rotate_at_seq_num;
c35f9726 JG	242	} LTTNG_PACKED;
c35f9726 JG	243
ce9dbd47 JG	244	/*
	245	* For certain releases, the LTTNG_PACKED annotation was missing on the
	246	* `new_chunk_id` field which causes padding to be added between the
	247	* "optional" structure's `is_set` and `value` fields.
	248	*
	249	* Three alignment cases are handled:
	250	* - `value` is aligned to the next byte boundary after `is_set`
	251	* no padding is produced, see
	252	* `struct lttcomm_relayd_rotate_streams_packed`,
	253	* - `value` is aligned to the next 4-byte boundary after `is_set`
	254	* (e.g. x86), 3 bytes of padding are produced, see
	255	* `struct lttcomm_relayd_rotate_streams_3_bytes_padding`,
	256	* - `value` is aligned to the next 8-byte boundary after `is_set`
	257	* (e.g. x86-64), 7 bytes of padding are produced, see
	258	* `struct lttcomm_relayd_rotate_streams_7_bytes_padding`.
	259	*
	260	* Note that since this structure's advertised size is used to determine
	261	* the size of the padding it includes, it can't be extended with new
	262	* optional fields. A new command would be needed.
	263	*/
c35f9726 JG	264	struct lttcomm_relayd_rotate_streams {
	265	uint32_t stream_count;
	266	/*
	267	* Streams can be rotated outside of a chunk but not be parented to
	268	* a new chunk.
ce9dbd47 JG	269	*
	270	* Improperly packed, but left as-is for backwards compatibility
	271	* with unpatched relay daemons.
c35f9726 JG	272	*/
	273	LTTNG_OPTIONAL_COMM(uint64_t) new_chunk_id;
	274	/* `stream_count` positions follow. */
	275	struct lttcomm_relayd_stream_rotation_position rotation_positions[];
d3ecc550 JD	276	} LTTNG_PACKED;
d3ecc550 JD	277
ce9dbd47 JG	278	struct lttcomm_relayd_rotate_streams_packed {
	279	uint32_t stream_count;
	280	LTTNG_OPTIONAL_COMM(uint64_t) LTTNG_PACKED new_chunk_id;
	281	struct lttcomm_relayd_stream_rotation_position rotation_positions[];
	282	} LTTNG_PACKED;
	283
	284	struct lttcomm_relayd_rotate_streams_3_bytes_padding {
	285	uint32_t stream_count;
	286	struct {
	287	union {
	288	uint8_t is_set;
	289	uint32_t padding;
	290	};
	291	uint64_t value;
	292	} LTTNG_PACKED new_chunk_id;
	293	struct lttcomm_relayd_stream_rotation_position rotation_positions[];
	294	} LTTNG_PACKED;
	295
	296	struct lttcomm_relayd_rotate_streams_7_bytes_padding {
	297	uint32_t stream_count;
	298	struct {
	299	union {
	300	uint8_t is_set;
	301	uint64_t padding;
	302	};
	303	uint64_t value;
	304	} LTTNG_PACKED new_chunk_id;
	305	struct lttcomm_relayd_stream_rotation_position rotation_positions[];
	306	} LTTNG_PACKED;
	307
e5add6d0 JG	308	struct lttcomm_relayd_create_trace_chunk {
	309	uint64_t chunk_id;
	310	/* Seconds since EPOCH. */
	311	uint64_t creation_timestamp;
	312	/* Includes trailing NULL. */
	313	uint32_t override_name_length;
	314	char override_name[];
	315	} LTTNG_PACKED;
	316
bbc4768c JG	317	struct lttcomm_relayd_close_trace_chunk {
	318	uint64_t chunk_id;
	319	/* Seconds since EPOCH. */
	320	uint64_t close_timestamp;
	321	/* enum lttng_trace_chunk_command_type */
	322	LTTNG_OPTIONAL_COMM(uint32_t) LTTNG_PACKED close_command;
	323	} LTTNG_PACKED;
	324
ecd1a12f MD	325	struct lttcomm_relayd_close_trace_chunk_reply {
	326	struct lttcomm_relayd_generic_reply generic;
	327	/* Includes trailing NULL. */
	328	uint32_t path_length;
	329	char path[];
	330	} LTTNG_PACKED;
	331
c35f9726 JG	332	struct lttcomm_relayd_trace_chunk_exists {
	333	uint64_t chunk_id;
	334	} LTTNG_PACKED;
	335
	336	struct lttcomm_relayd_trace_chunk_exists_reply {
	337	struct lttcomm_relayd_generic_reply generic;
	338	uint8_t trace_chunk_exists;
	339	} LTTNG_PACKED;
	340
8614e600 MD	341	enum lttcomm_relayd_configuration_flag {
	342	/* The relay daemon (2.12) is configured to allow clear operations. */
	343	LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED = (1 << 0),
	344	};
	345
f4c5b127 JR	346	enum lttcomm_relayd_configuration_query_flag {
	347	LTTCOMM_RELAYD_CONFIGURATION_QUERY_FLAG_SUPPORTED_TRACE_FORMAT = (1 << 0),
	348	LTTCOMM_RELAYD_CONFIGURATION_QUERY_FLAG_MASK = 0x01
	349	};
	350
	351	enum lttcomm_relayd_configuration_trace_format_flag {
	352	LTTCOMM_RELAYD_CONFIGURATION_TRACE_FORMAT_SUPPORTED_CTF1 = (1 << 0),
40a3f14a	353	LTTCOMM_RELAYD_CONFIGURATION_TRACE_FORMAT_SUPPORTED_CTF2 = (1 << 1)
f4c5b127 JR	354	};
f4c5b127 JR	355
8614e600 MD	356	struct lttcomm_relayd_get_configuration {
	357	uint64_t query_flags;
	358	} LTTNG_PACKED;
	359
f4c5b127 JR	360	struct lttcomm_relayd_get_configuration_specialized_query_reply {
	361	uint64_t query_flag; // Single flag, enum lttcomm_relayd_configuration_trace_format_flag
	362	uint64_t payload_len;
	363	/*
	364	* Payload dependant on type
	365	* LTTCOMM_RELAYD_CONFIGURATION_QUERY_FLAG_SUPPORTED_TRACE_FORMAT:
	366	* uint64_t, bitfield of lttcomm_relayd_configuration_trace_format_flag.
	367	*/
	368	char payload[];
	369	} LTTNG_PACKED;
8614e600 MD	370	/*
	371	* Used to return a relay daemon's configuration in reply to the
	372	* RELAYD_GET_CONFIGURATION command.
	373	*/
	374	struct lttcomm_relayd_get_configuration_reply {
	375	struct lttcomm_relayd_generic_reply generic;
	376	/* Set of lttcomm_relayd_configuration_flag. */
	377	uint64_t relayd_configuration_flags;
f4c5b127 JR	378	/*
	379	* Optional variable-length payload.
	380	* When N query flags are used, it is expected that N dynamic sized
	381	* lttcomm_relayd_get_configuration_specialized_query_reply be present.
	382	*/
8614e600 MD	383	char payload[];
	384	} LTTNG_PACKED;
	385
b8aa1682	386	#endif /* _RELAYD_COMM */