Add enable channel support for UST
[lttng-tools.git] / ltt-sessiond / traceable-app.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 _TRACEABLE_APP_H
20 #define _TRACEABLE_APP_H
21
22 #include <stdint.h>
23 #include <urcu/list.h>
24
25 #include "trace-ust.h"
26
27 /*
28 * Application registration data structure.
29 */
30 struct ust_register_msg {
31 uint32_t major;
32 uint32_t minor;
33 pid_t pid;
34 pid_t ppid;
35 uid_t uid;
36 gid_t gid;
37 char name[16];
38 };
39
40 /*
41 * Traceable application list.
42 */
43 struct ltt_traceable_app_list {
44 /*
45 * This lock protects any read/write access to the list and count (which is
46 * basically the list size). All public functions in traceable-app.c
47 * acquire this lock and release it before returning. If none of those
48 * functions are used, the lock MUST be acquired in order to iterate or/and
49 * do any actions on that list.
50 */
51 pthread_mutex_t lock;
52
53 /*
54 * Number of element in the list. The session list lock MUST be acquired if
55 * this counter is used when iterating over the session list.
56 */
57 unsigned int count;
58
59 /* Linked list head */
60 struct cds_list_head head;
61 };
62
63 /* Registered traceable applications. Libust registers to the session daemon
64 * and a linked list is kept of all running traceable app.
65 */
66 struct ltt_traceable_app {
67 int sock; /* Communication socket with the application */
68 pid_t pid;
69 pid_t ppid;
70 uid_t uid; /* User ID that owns the apps */
71 gid_t gid; /* Group ID that owns the apps */
72 uint32_t v_major; /* Verion major number */
73 uint32_t v_minor; /* Verion minor number */
74 char name[17]; /* Process name (short) */
75 struct ltt_ust_channel_list channels;
76 struct cds_list_head list;
77 };
78
79 int register_traceable_app(struct ust_register_msg *msg, int sock);
80 void unregister_traceable_app(int sock);
81 unsigned int get_app_count(void);
82
83 void lock_apps_list(void);
84 void unlock_apps_list(void);
85 void clean_traceable_apps_list(void);
86 struct ltt_traceable_app_list *get_traceable_apps_list(void);
87
88 struct ltt_traceable_app *traceable_app_get_by_pid(pid_t pid);
89
90 #endif /* _TRACEABLE_APP_H */
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