Fix: relay_recv_metadata does not check for partial write
[lttng-tools.git] / src / bin / lttng-relayd / session.h
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1#ifndef _SESSION_H
2#define _SESSION_H
3
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4/*
5 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
6 * David Goulet <dgoulet@efficios.com>
7591bab1 7 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License, version 2 only, as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 *
18 * You should have received a copy of the GNU General Public License along with
19 * this program; if not, write to the Free Software Foundation, Inc., 51
20 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
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23#include <limits.h>
24#include <inttypes.h>
25#include <pthread.h>
c3b7390b 26#include <urcu/list.h>
7591bab1 27#include <urcu/ref.h>
2f8f53af 28
36d2e35d 29#include <lttng/constant.h>
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30#include <common/hashtable/hashtable.h>
31
32/*
33 * Represents a session for the relay point of view
34 */
35struct relay_session {
36 /*
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37 * This session id is generated by the relay daemon to guarantee
38 * its uniqueness even when serving multiple session daemons.
39 * It is used to match a set of streams to their session.
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40 */
41 uint64_t id;
36d2e35d 42 char session_name[LTTNG_NAME_MAX];
9cf3eb20 43 char hostname[LTTNG_HOST_NAME_MAX];
2f8f53af 44 uint32_t live_timer;
2a174661 45
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46 /* Session in snapshot mode. */
47 bool snapshot;
48
49 /*
50 * Session has no back reference to its connection because it
51 * has a life-time that can be longer than the consumer connection's
52 * life-time; a reference can still be held by the viewer
53 * connection through the viewer streams.
54 */
55
56 struct urcu_ref ref;
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57
58 pthread_mutex_t lock;
59
60 /* major/minor version used for this session. */
61 uint32_t major;
62 uint32_t minor;
63
64 bool viewer_attached;
65 /* Tell if the session connection has been closed on the streaming side. */
66 bool connection_closed;
2a174661 67
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68 /*
69 * Tell if the session is currently living in a exiting relayd and
70 * should be cleaned forcefully without waiting for pending data or
71 * pending ctrl data.
72 */
73 bool aborted;
74
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75 /* Contains ctf_trace object of that session indexed by path name. */
76 struct lttng_ht *ctf_traces_ht;
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77
78 /*
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79 * This contains streams that are received on that connection.
80 * It's used to store them until we get the streams sent
81 * command. When this is received, we remove those streams from
82 * the list and publish them.
83 *
84 * Updates are protected by the recv_list_lock.
85 * Traversals are protected by RCU.
86 * recv_list_lock also protects stream_count.
2f8f53af 87 */
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88 struct cds_list_head recv_list; /* RCU list. */
89 uint32_t stream_count;
90 pthread_mutex_t recv_list_lock;
91
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92 /*
93 * Flag checked and exchanged with uatomic_cmpxchg to tell the
94 * viewer-side if new streams got added since the last check.
95 */
96 unsigned long new_streams;
97
98 /*
7591bab1 99 * Node in the global session hash table.
2f8f53af 100 */
7591bab1 101 struct lttng_ht_node_u64 session_n;
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102 /*
103 * Member of the session list in struct relay_viewer_session.
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104 * Updates are protected by the relay_viewer_session
105 * session_list_lock. Traversals are protected by RCU.
c3b7390b 106 */
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107 struct cds_list_head viewer_session_node;
108 struct rcu_head rcu_node; /* For call_rcu teardown. */
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109};
110
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111struct relay_session *session_create(const char *session_name,
112 const char *hostname, uint32_t live_timer,
113 bool snapshot, uint32_t major, uint32_t minor);
114struct relay_session *session_get_by_id(uint64_t id);
115bool session_get(struct relay_session *session);
116void session_put(struct relay_session *session);
2a174661 117
7591bab1 118int session_close(struct relay_session *session);
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119int session_abort(struct relay_session *session);
120
7591bab1 121void print_sessions(void);
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122
123#endif /* _SESSION_H */
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