Create all trace directories and files with client user credentials
[lttng-tools.git] / 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
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; only version 2
7 * of the License.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #ifndef _LTT_SESSION_H
20 #define _LTT_SESSION_H
21
22 #include <pthread.h>
23 #include <unistd.h>
24 #include <urcu/list.h>
25
26 #include "trace-kernel.h"
27 #include "trace-ust.h"
28
29 /*
30 * Tracing session list
31 *
32 * Statically declared in session.c and can be accessed by using
33 * session_get_list() function that returns the pointer to the list.
34 */
35 struct ltt_session_list {
36 /*
37 * This lock protects any read/write access to the list and count (which is
38 * basically the list size). All public functions in session.c acquire this
39 * lock and release it before returning. If none of those functions are
40 * used, the lock MUST be acquired in order to iterate or/and do any
41 * actions on that list.
42 */
43 pthread_mutex_t lock;
44
45 /*
46 * Number of element in the list. The session list lock MUST be acquired if
47 * this counter is used when iterating over the session list.
48 */
49 unsigned int count;
50
51 /* Linked list head */
52 struct cds_list_head head;
53 };
54
55 /*
56 * This data structure contains information needed to identify a tracing
57 * session for both LTTng and UST.
58 */
59 struct ltt_session {
60 char name[NAME_MAX];
61 char path[PATH_MAX];
62 struct ltt_kernel_session *kernel_session;
63 struct ltt_ust_session *ust_session;
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
67 * session_lock() and session_unlock() for that.
68 */
69 pthread_mutex_t lock;
70 struct cds_list_head list;
71 int enabled; /* enabled/started flag */
72 int id; /* session unique identifier */
73 /* UID/GID of the user owning the session */
74 uid_t uid;
75 gid_t gid;
76 };
77
78 /* Prototypes */
79 int session_create(char *name, char *path, uid_t uid, gid_t gid);
80 int session_destroy(struct ltt_session *session);
81
82 void session_lock(struct ltt_session *session);
83 void session_lock_list(void);
84 void session_unlock(struct ltt_session *session);
85 void session_unlock_list(void);
86
87 struct ltt_session *session_find_by_name(char *name);
88 struct ltt_session_list *session_get_list(void);
89
90 #endif /* _LTT_SESSION_H */
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