Update coding style. Add error handling section
[lttng-tools.git] / src / common / sessiond-comm / relayd.h
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1/*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 * Julien Desfossez <julien.desfossez@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, version 2 only,
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * 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 _RELAYD_COMM
20#define _RELAYD_COMM
21
22#define _GNU_SOURCE
23
24#include <limits.h>
25#include <stdint.h>
26
27#include <lttng/lttng.h>
28
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29#define RELAYD_VERSION_COMM_MAJOR 2
30#define RELAYD_VERSION_COMM_MINOR 1
31
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32/*
33 * lttng-relayd communication header.
34 */
35struct 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 */
39 uint32_t cmd; /* enum lttcomm_sessiond_command */
40 uint32_t cmd_version; /* command version */
41} __attribute__ ((__packed__));
42
43/*
44 * lttng-relayd data header.
45 */
46struct 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. */
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51 uint32_t data_size; /* data size following this header */
52} __attribute__ ((__packed__));
53
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54/*
55 * Used to add a stream on the relay daemon.
56 */
57struct lttcomm_relayd_add_stream {
58 char channel_name[LTTNG_SYMBOL_NAME_LEN];
59 char pathname[PATH_MAX];
60} __attribute__ ((__packed__));
61
62/*
63 * Answer from an add stream command.
64 */
65struct lttcomm_relayd_status_stream {
66 uint64_t handle;
67 uint32_t ret_code;
68} __attribute__ ((__packed__));
69
70/*
71 * Used to return command code for command not needing special data.
72 */
73struct lttcomm_relayd_generic_reply {
74 uint32_t ret_code;
75} __attribute__ ((__packed__));
76
77/*
78 * Used to update synchronization information.
79 */
80struct lttcomm_relayd_update_sync_info {
173af62f 81 /* TODO: fill the structure. Feature not implemented yet */
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82} __attribute__ ((__packed__));
83
84/*
85 * Version command.
86 */
87struct lttcomm_relayd_version {
88 uint32_t major;
89 uint32_t minor;
90} __attribute__ ((__packed__));
91
92/*
93 * Metadata payload used when metadata command is sent.
94 */
95struct lttcomm_relayd_metadata_payload {
96 uint64_t stream_id;
97 char payload[];
98} __attribute__ ((__packed__));
99
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100/*
101 * Used to indicate that a specific stream id can now be closed.
102 */
103struct lttcomm_relayd_close_stream {
104 uint64_t stream_id;
105 uint64_t last_net_seq_num; /* sequence number of last packet */
106} __attribute__ ((__packed__));
107
b8aa1682 108#endif /* _RELAYD_COMM */
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