Fix: don't send error to sessiond on orderly shutdown
[lttng-tools.git] / src / bin / lttng-relayd / lttng-relayd.h
1 /*
2 * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@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 LTTNG_RELAYD_H
20 #define LTTNG_RELAYD_H
21
22 #define _LGPL_SOURCE
23 #include <urcu.h>
24 #include <urcu/wfqueue.h>
25 #include <common/hashtable/hashtable.h>
26
27 /*
28 * Queue used to enqueue relay requests
29 */
30 struct relay_cmd_queue {
31 struct cds_wfq_queue queue;
32 int32_t futex;
33 };
34
35 enum connection_type {
36 RELAY_DATA,
37 RELAY_CONTROL,
38 };
39
40 /*
41 * Represents a session for the relay point of view
42 */
43 struct relay_session {
44 /*
45 * This session id is used to identify a set of stream to a tracing session
46 * but also make sure we have a unique session id associated with a session
47 * daemon which can provide multiple data source.
48 */
49 uint64_t id;
50 struct lttcomm_sock *sock;
51 };
52
53 /*
54 * Represents a stream in the relay
55 */
56 struct relay_stream {
57 uint64_t stream_handle;
58 uint64_t prev_seq; /* previous data sequence number encountered */
59 struct lttng_ht_node_ulong stream_n;
60 struct relay_session *session;
61 struct rcu_head rcu_node;
62 int fd;
63
64 char *path_name;
65 char *channel_name;
66 /* on-disk circular buffer of tracefiles */
67 uint64_t tracefile_size;
68 uint64_t tracefile_size_current;
69 uint64_t tracefile_count;
70 uint64_t tracefile_count_current;
71
72 /* Information telling us when to close the stream */
73 unsigned int close_flag:1;
74 uint64_t last_net_seq_num;
75 /* Indicate if the stream was initialized for a data pending command. */
76 unsigned int data_pending_check_done:1;
77 };
78
79 /*
80 * Internal structure to map a socket with the corresponding session.
81 * A hashtable indexed on the socket FD is used for the lookups.
82 */
83 struct relay_command {
84 struct lttcomm_sock *sock;
85 struct relay_session *session;
86 struct cds_wfq_node node;
87 struct lttng_ht_node_ulong sock_n;
88 struct rcu_head rcu_node;
89 enum connection_type type;
90 unsigned int version_check_done:1;
91 /* protocol version to use for this session */
92 uint32_t major;
93 uint32_t minor;
94 };
95
96 extern char *opt_output_path;
97
98 #endif /* LTTNG_RELAYD_H */
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