Add snapshot output init call that uses URIs
[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];
20fe2104 62 struct ltt_kernel_session *kernel_session;
f6a9efaa 63 struct ltt_ust_session *ust_session;
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64 /*
65 * Protect any read/write on this session data structure. This lock must be
66 * acquired *before* using any public functions declared below. Use
54d01ffb 67 * session_lock() and session_unlock() for that.
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68 */
69 pthread_mutex_t lock;
70 struct cds_list_head list;
464dd62d 71 int enabled; /* enabled/started flag */
d022620a 72 uint64_t id; /* session unique identifier */
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73 /* UID/GID of the user owning the session */
74 uid_t uid;
75 gid_t gid;
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76 /*
77 * Network session handle. A value of 0 means that there is no remote
78 * session established.
79 */
80 uint64_t net_handle;
81 /*
82 * This consumer is only set when the create_session_uri call is made.
83 * This contains the temporary information for a consumer output. Upon
84 * creation of the UST or kernel session, this consumer, if available, is
85 * copied into those sessions.
86 */
87 struct consumer_output *consumer;
a4b92340 88
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89 /* Did a start command occured before the kern/ust session creation? */
90 unsigned int started;
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91
92 /* Snapshot representation in a session. */
93 struct snapshot snapshot;
94 /* Indicate if the session has to output the traces or not. */
95 unsigned int output_traces;
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96};
97
98/* Prototypes */
dec56f6c 99int session_create(char *name, uid_t uid, gid_t gid);
271933a4 100int session_destroy(struct ltt_session *session);
6c9cc2ab 101
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102void session_lock(struct ltt_session *session);
103void session_lock_list(void);
104void session_unlock(struct ltt_session *session);
105void session_unlock_list(void);
6c9cc2ab 106
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107struct ltt_session *session_find_by_name(char *name);
108struct ltt_session_list *session_get_list(void);
5b74c7b1 109
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110int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid);
111
5b74c7b1 112#endif /* _LTT_SESSION_H */
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