OpenVPN
mstats.h
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1 /*
2  * OpenVPN -- An application to securely tunnel IP networks
3  * over a single TCP/UDP port, with support for SSL/TLS-based
4  * session authentication and key exchange,
5  * packet encryption, packet authentication, and
6  * packet compression.
7  *
8  * Copyright (C) 2002-2018 OpenVPN Inc <sales@openvpn.net>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2
12  * as published by the Free Software Foundation.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License along
20  * with this program; if not, write to the Free Software Foundation, Inc.,
21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22  */
23 
24 /*
25  * Maintain usage stats in a memory-mapped file
26  */
27 
28 #if !defined(OPENVPN_MEMSTATS_H) && defined(ENABLE_MEMSTATS)
29 #define OPENVPN_MEMSTATS_H
30 
31 #include "basic.h"
32 
33 /* this struct is mapped to the file */
34 struct mmap_stats {
35  counter_type link_read_bytes; /* counter_type can be assumed to be a uint64_t */
36  counter_type link_write_bytes;
37  int n_clients;
38 
39 #define MSTATS_UNDEF 0
40 #define MSTATS_ACTIVE 1
41 #define MSTATS_EXPIRED 2
42  int state;
43 };
44 
45 extern volatile struct mmap_stats *mmap_stats; /* GLOBAL */
46 
47 void mstats_open(const char *fn);
48 
49 void mstats_close(void);
50 
51 #endif /* if !defined(OPENVPN_MEMSTATS_H) && defined(ENABLE_MEMSTATS) */
unsigned int counter_type
Definition: common.h:38