2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
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.
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.
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.
18 #ifndef _LTT_SESSION_H
19 #define _LTT_SESSION_H
21 #include <urcu/list.h>
23 #include <common/hashtable/hashtable.h>
26 #include "trace-kernel.h"
28 struct ltt_ust_session
;
31 * Tracing session list
33 * Statically declared in session.c and can be accessed by using
34 * session_get_list() function that returns the pointer to the list.
36 struct ltt_session_list
{
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.
47 * Session unique ID generator. The session list lock MUST be
48 * upon update and read of this counter.
52 /* Linked list head */
53 struct cds_list_head head
;
57 * This data structure contains information needed to identify a tracing
58 * session for both LTTng and UST.
62 struct ltt_kernel_session
*kernel_session
;
63 struct ltt_ust_session
*ust_session
;
65 * Protect any read/write on this session data structure. This lock must be
66 * acquired *before* using any public functions declared below. Use
67 * session_lock() and session_unlock() for that.
70 struct cds_list_head list
;
71 uint64_t id
; /* session unique identifier */
72 /* UID/GID of the user owning the session */
76 * Network session handle. A value of 0 means that there is no remote
77 * session established.
81 * This consumer is only set when the create_session_uri call is made.
82 * This contains the temporary information for a consumer output. Upon
83 * creation of the UST or kernel session, this consumer, if available, is
84 * copied into those sessions.
86 struct consumer_output
*consumer
;
88 /* Did at least ONE start command has been triggered?. */
89 unsigned int has_been_started
:1;
91 * Is the session active? Start trace command sets this to 1 and the stop
92 * command reset it to 0.
94 unsigned int active
:1;
96 /* Snapshot representation in a session. */
97 struct snapshot snapshot
;
98 /* Indicate if the session has to output the traces or not. */
99 unsigned int output_traces
;
101 * This session is in snapshot mode. This means that every channel enabled
102 * will be set in overwrite mode and mmap. It is considered exclusively for
105 unsigned int snapshot_mode
;
109 int session_create(char *name
, uid_t uid
, gid_t gid
);
110 int session_destroy(struct ltt_session
*session
);
112 void session_lock(struct ltt_session
*session
);
113 void session_lock_list(void);
114 void session_unlock(struct ltt_session
*session
);
115 void session_unlock_list(void);
117 struct ltt_session
*session_find_by_name(char *name
);
118 struct ltt_session_list
*session_get_list(void);
120 int session_access_ok(struct ltt_session
*session
, uid_t uid
, gid_t gid
);
122 #endif /* _LTT_SESSION_H */
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