1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_MSC_VER)
#include "config-msvc.h"
#endif
#ifndef HAVE_GETTIMEOFDAY
#include "compat.h"
#ifdef WIN32
/*
* NOTICE: mingw has much faster gettimeofday!
* autoconf will set HAVE_GETTIMEOFDAY
*/
#include <windows.h>
#include <time.h>
static time_t gtc_base = 0;
static DWORD gtc_last = 0;
static time_t last_sec = 0;
static unsigned int last_msec = 0;
static int bt_last = 0;
static void
gettimeofday_calibrate (void)
{
const time_t t = time(NULL);
const DWORD gtc = GetTickCount();
gtc_base = t - gtc/1000;
gtc_last = gtc;
}
/*
* Rewritten by JY for OpenVPN 2.1, after I realized that
* QueryPerformanceCounter takes nearly 2 orders of magnitude
* more processor cycles than GetTickCount.
*/
int
gettimeofday (struct timeval *tv, void *tz)
{
const DWORD gtc = GetTickCount();
int bt = 0;
time_t sec;
unsigned int msec;
const int backtrack_hold_seconds = 10;
(void)tz;
/* recalibrate at the dreaded 49.7 day mark */
if (!gtc_base || gtc < gtc_last)
gettimeofday_calibrate ();
gtc_last = gtc;
sec = gtc_base + gtc / 1000;
msec = gtc % 1000;
if (sec == last_sec)
{
if (msec < last_msec)
{
msec = last_msec;
bt = 1;
}
}
else if (sec < last_sec)
{
/* We try to dampen out backtracks of less than backtrack_hold_seconds.
Larger backtracks will be passed through and dealt with by the
TIME_BACKTRACK_PROTECTION code (if enabled) */
if (sec > last_sec - backtrack_hold_seconds)
{
sec = last_sec;
msec = last_msec;
}
bt = 1;
}
tv->tv_sec = (long)last_sec = (long)sec;
tv->tv_usec = (last_msec = msec) * 1000;
if (bt && !bt_last)
gettimeofday_calibrate ();
bt_last = bt;
return 0;
}
#else
#ifdef HAVE_TIME_H
#include <time.h>
#endif
int
gettimeofday (struct timeval *tv, void *tz)
{
(void)tz;
tv->tv_sec = time(NULL);
tv->tv_usec = 0;
return 0;
}
#endif /* WIN32 */
#endif /* HAVE_GETTIMEOFDAY */
|
