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91d76f53 | 1 | /* |
5b74c7b1 DG |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
3 | * | |
d14d33bf AM |
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. | |
5b74c7b1 DG |
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 | * | |
d14d33bf AM |
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. | |
5b74c7b1 DG |
16 | */ |
17 | ||
18 | #ifndef _LTT_SESSION_H | |
19 | #define _LTT_SESSION_H | |
20 | ||
20fe2104 | 21 | #include <urcu/list.h> |
d4a2a84a | 22 | |
00187dd4 DG |
23 | #include "trace-kernel.h" |
24 | #include "trace-ust.h" | |
25 | ||
b5541356 DG |
26 | /* |
27 | * Tracing session list | |
28 | * | |
29 | * Statically declared in session.c and can be accessed by using | |
54d01ffb | 30 | * session_get_list() function that returns the pointer to the list. |
b5541356 | 31 | */ |
5b74c7b1 | 32 | struct ltt_session_list { |
b5541356 DG |
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; | |
6c9cc2ab | 41 | |
b5541356 | 42 | /* |
6c9cc2ab DG |
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. | |
b5541356 DG |
45 | */ |
46 | unsigned int count; | |
6c9cc2ab DG |
47 | |
48 | /* Linked list head */ | |
5b74c7b1 DG |
49 | struct cds_list_head head; |
50 | }; | |
51 | ||
b5541356 DG |
52 | /* |
53 | * This data structure contains information needed to identify a tracing | |
54 | * session for both LTTng and UST. | |
5b74c7b1 DG |
55 | */ |
56 | struct ltt_session { | |
74babd95 DG |
57 | char name[NAME_MAX]; |
58 | char path[PATH_MAX]; | |
20fe2104 | 59 | struct ltt_kernel_session *kernel_session; |
f6a9efaa | 60 | struct ltt_ust_session *ust_session; |
b5541356 DG |
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 | |
54d01ffb | 64 | * session_lock() and session_unlock() for that. |
b5541356 DG |
65 | */ |
66 | pthread_mutex_t lock; | |
67 | struct cds_list_head list; | |
464dd62d | 68 | int enabled; /* enabled/started flag */ |
dab4fc14 | 69 | unsigned int id; /* session unique identifier */ |
6df2e2c9 MD |
70 | /* UID/GID of the user owning the session */ |
71 | uid_t uid; | |
72 | gid_t gid; | |
5b74c7b1 DG |
73 | }; |
74 | ||
75 | /* Prototypes */ | |
6df2e2c9 | 76 | int session_create(char *name, char *path, uid_t uid, gid_t gid); |
271933a4 | 77 | int session_destroy(struct ltt_session *session); |
6c9cc2ab | 78 | |
54d01ffb DG |
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); | |
6c9cc2ab | 83 | |
54d01ffb DG |
84 | struct ltt_session *session_find_by_name(char *name); |
85 | struct ltt_session_list *session_get_list(void); | |
5b74c7b1 DG |
86 | |
87 | #endif /* _LTT_SESSION_H */ |