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
22 #include <urcu/list.h>
24 #include <common/hashtable/hashtable.h>
27 #include "trace-kernel.h"
29 struct ltt_ust_session
;
32 * Tracing session list
34 * Statically declared in session.c and can be accessed by using
35 * session_get_list() function that returns the pointer to the list.
37 struct ltt_session_list
{
39 * This lock protects any read/write access to the list and
40 * next_uuid. All public functions in session.c acquire this
41 * lock and release it before returning. If none of those
42 * functions are used, the lock MUST be acquired in order to
43 * iterate or/and do any actions on that list.
48 * Session unique ID generator. The session list lock MUST be
49 * upon update and read of this counter.
53 /* Linked list head */
54 struct cds_list_head head
;
58 * This data structure contains information needed to identify a tracing
59 * session for both LTTng and UST.
63 char hostname
[HOST_NAME_MAX
]; /* Local hostname. */
64 struct ltt_kernel_session
*kernel_session
;
65 struct ltt_ust_session
*ust_session
;
67 * Protect any read/write on this session data structure. This lock must be
68 * acquired *before* using any public functions declared below. Use
69 * session_lock() and session_unlock() for that.
72 struct cds_list_head list
;
73 uint64_t id
; /* session unique identifier */
74 /* UID/GID of the user owning the session */
78 * Network session handle. A value of 0 means that there is no remote
79 * session established.
83 * This consumer is only set when the create_session_uri call is made.
84 * This contains the temporary information for a consumer output. Upon
85 * creation of the UST or kernel session, this consumer, if available, is
86 * copied into those sessions.
88 struct consumer_output
*consumer
;
90 /* Did at least ONE start command has been triggered?. */
91 unsigned int has_been_started
:1;
93 * Is the session active? Start trace command sets this to 1 and the stop
94 * command reset it to 0.
96 unsigned int active
:1;
98 /* Snapshot representation in a session. */
99 struct snapshot snapshot
;
100 /* Indicate if the session has to output the traces or not. */
101 unsigned int output_traces
;
103 * This session is in snapshot mode. This means that every channel enabled
104 * will be set in overwrite mode and mmap. It is considered exclusively for
107 unsigned int snapshot_mode
;
109 * Timer set when the session is created for live reading.
111 unsigned int live_timer
;
113 * Path where to keep the shared memory files.
115 char shm_path
[PATH_MAX
];
119 int session_create(char *name
, uid_t uid
, gid_t gid
);
120 int session_destroy(struct ltt_session
*session
);
122 void session_lock(struct ltt_session
*session
);
123 void session_lock_list(void);
124 void session_unlock(struct ltt_session
*session
);
125 void session_unlock_list(void);
127 struct ltt_session
*session_find_by_name(const char *name
);
128 struct ltt_session_list
*session_get_list(void);
130 int session_access_ok(struct ltt_session
*session
, uid_t uid
, gid_t gid
);
132 #endif /* _LTT_SESSION_H */
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