Fix: remove bad UST header in consumer-timer.c
[lttng-tools.git] / src / bin / lttng-sessiond / session.h
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91d76f53 1/*
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2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
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7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
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13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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16 */
17
18#ifndef _LTT_SESSION_H
19#define _LTT_SESSION_H
20
20fe2104 21#include <urcu/list.h>
d4a2a84a 22
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23#include <common/hashtable/hashtable.h>
24
25#include "snapshot.h"
00187dd4 26#include "trace-kernel.h"
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27
28struct ltt_ust_session;
00187dd4 29
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30/*
31 * Tracing session list
32 *
33 * Statically declared in session.c and can be accessed by using
54d01ffb 34 * session_get_list() function that returns the pointer to the list.
b5541356 35 */
5b74c7b1 36struct ltt_session_list {
b5541356 37 /*
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38 * This lock protects any read/write access to the list and
39 * next_uuid. All public functions in session.c acquire this
40 * lock and release it before returning. If none of those
41 * functions are used, the lock MUST be acquired in order to
42 * iterate or/and do any actions on that list.
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43 */
44 pthread_mutex_t lock;
6c9cc2ab 45
b5541356 46 /*
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47 * Session unique ID generator. The session list lock MUST be
48 * upon update and read of this counter.
b5541356 49 */
d022620a 50 uint64_t next_uuid;
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51
52 /* Linked list head */
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53 struct cds_list_head head;
54};
55
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56/*
57 * This data structure contains information needed to identify a tracing
58 * session for both LTTng and UST.
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59 */
60struct ltt_session {
74babd95 61 char name[NAME_MAX];
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62 /* FIXME : size */
63 char hostname[PATH_MAX]; /* local hostname, FIXME : could be useful to have that user defined too */
20fe2104 64 struct ltt_kernel_session *kernel_session;
f6a9efaa 65 struct ltt_ust_session *ust_session;
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66 /*
67 * Protect any read/write on this session data structure. This lock must be
68 * acquired *before* using any public functions declared below. Use
54d01ffb 69 * session_lock() and session_unlock() for that.
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70 */
71 pthread_mutex_t lock;
72 struct cds_list_head list;
464dd62d 73 int enabled; /* enabled/started flag */
d022620a 74 uint64_t id; /* session unique identifier */
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75 /* UID/GID of the user owning the session */
76 uid_t uid;
77 gid_t gid;
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78 /*
79 * Network session handle. A value of 0 means that there is no remote
80 * session established.
81 */
82 uint64_t net_handle;
83 /*
84 * This consumer is only set when the create_session_uri call is made.
85 * This contains the temporary information for a consumer output. Upon
86 * creation of the UST or kernel session, this consumer, if available, is
87 * copied into those sessions.
88 */
89 struct consumer_output *consumer;
a4b92340 90
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91 /* Did a start command occured before the kern/ust session creation? */
92 unsigned int started;
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93
94 /* Snapshot representation in a session. */
95 struct snapshot snapshot;
96 /* Indicate if the session has to output the traces or not. */
97 unsigned int output_traces;
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98 /*
99 * This session is in snapshot mode. This means that every channel enabled
100 * will be set in overwrite mode and mmap. It is considered exclusively for
101 * snapshot purposes.
102 */
103 unsigned int snapshot_mode;
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104 /*
105 * Timer set when the session is created for live reading.
106 */
107 int live_timer;
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108};
109
110/* Prototypes */
dec56f6c 111int session_create(char *name, uid_t uid, gid_t gid);
271933a4 112int session_destroy(struct ltt_session *session);
6c9cc2ab 113
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114void session_lock(struct ltt_session *session);
115void session_lock_list(void);
116void session_unlock(struct ltt_session *session);
117void session_unlock_list(void);
6c9cc2ab 118
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119struct ltt_session *session_find_by_name(char *name);
120struct ltt_session_list *session_get_list(void);
5b74c7b1 121
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122int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid);
123
5b74c7b1 124#endif /* _LTT_SESSION_H */
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