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 "trace-kernel.h"
25 struct ltt_ust_session
;
28 * Tracing session list
30 * Statically declared in session.c and can be accessed by using
31 * session_get_list() function that returns the pointer to the list.
33 struct ltt_session_list
{
35 * This lock protects any read/write access to the list and
36 * next_uuid. All public functions in session.c acquire this
37 * lock and release it before returning. If none of those
38 * functions are used, the lock MUST be acquired in order to
39 * iterate or/and do any actions on that list.
44 * Session unique ID generator. The session list lock MUST be
45 * upon update and read of this counter.
47 unsigned int next_uuid
;
49 /* Linked list head */
50 struct cds_list_head head
;
54 * This data structure contains information needed to identify a tracing
55 * session for both LTTng and UST.
60 struct ltt_kernel_session
*kernel_session
;
61 struct ltt_ust_session
*ust_session
;
63 * Protect any read/write on this session data structure. This lock must be
64 * acquired *before* using any public functions declared below. Use
65 * session_lock() and session_unlock() for that.
68 struct cds_list_head list
;
69 int enabled
; /* enabled/started flag */
70 unsigned int id
; /* session unique identifier */
71 /* UID/GID of the user owning the session */
75 * Network session handle. A value of 0 means that there is no remote
76 * session established.
80 * This consumer is only set when the create_session_uri call is made.
81 * This contains the temporary information for a consumer output. Upon
82 * creation of the UST or kernel session, this consumer, if available, is
83 * copied into those sessions.
85 struct consumer_output
*consumer
;
87 /* Did a start command occured before the kern/ust session creation? */
92 int session_create(char *name
, char *path
, uid_t uid
, gid_t gid
);
93 int session_destroy(struct ltt_session
*session
);
95 void session_lock(struct ltt_session
*session
);
96 void session_lock_list(void);
97 void session_unlock(struct ltt_session
*session
);
98 void session_unlock_list(void);
100 struct ltt_session
*session_find_by_name(char *name
);
101 struct ltt_session_list
*session_get_list(void);
103 int session_access_ok(struct ltt_session
*session
, uid_t uid
, gid_t gid
);
105 #endif /* _LTT_SESSION_H */
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