Fix: return value signedness
[lttng-tools.git] / src / bin / lttng-sessiond / session.h
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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.
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 *
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.
16 */
17
18 #ifndef _LTT_SESSION_H
19 #define _LTT_SESSION_H
20
21 #include <urcu/list.h>
22
23 #include "trace-kernel.h"
24 #include "trace-ust.h"
25
26 /*
27 * Tracing session list
28 *
29 * Statically declared in session.c and can be accessed by using
30 * session_get_list() function that returns the pointer to the list.
31 */
32 struct ltt_session_list {
33 /*
34 * This lock protects any read/write access to the list and count (which is
35 * basically the list size). All public functions in session.c acquire this
36 * lock and release it before returning. If none of those functions are
37 * used, the lock MUST be acquired in order to iterate or/and do any
38 * actions on that list.
39 */
40 pthread_mutex_t lock;
41
42 /*
43 * Number of element in the list. The session list lock MUST be acquired if
44 * this counter is used when iterating over the session list.
45 */
46 unsigned int count;
47
48 /* Linked list head */
49 struct cds_list_head head;
50 };
51
52 /*
53 * This data structure contains information needed to identify a tracing
54 * session for both LTTng and UST.
55 */
56 struct ltt_session {
57 char name[NAME_MAX];
58 char path[PATH_MAX];
59 struct ltt_kernel_session *kernel_session;
60 struct ltt_ust_session *ust_session;
61 /*
62 * Protect any read/write on this session data structure. This lock must be
63 * acquired *before* using any public functions declared below. Use
64 * session_lock() and session_unlock() for that.
65 */
66 pthread_mutex_t lock;
67 struct cds_list_head list;
68 int enabled; /* enabled/started flag */
69 unsigned int id; /* session unique identifier */
70 /* UID/GID of the user owning the session */
71 uid_t uid;
72 gid_t gid;
73 };
74
75 /* Prototypes */
76 int session_create(char *name, char *path, uid_t uid, gid_t gid);
77 int session_destroy(struct ltt_session *session);
78
79 void session_lock(struct ltt_session *session);
80 void session_lock_list(void);
81 void session_unlock(struct ltt_session *session);
82 void session_unlock_list(void);
83
84 struct ltt_session *session_find_by_name(char *name);
85 struct ltt_session_list *session_get_list(void);
86
87 #endif /* _LTT_SESSION_H */
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