VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/win/time2-win.cpp@ 81106

Last change on this file since 81106 was 76553, checked in by vboxsync, 6 years ago

scm --update-copyright-year

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id Revision
File size: 5.6 KB
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1/* $Id: time2-win.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2/** @file
3 * IPRT - Time, Windows.
4 */
5
6/*
7 * Copyright (C) 2006-2019 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*********************************************************************************************************************************
29* Header Files *
30*********************************************************************************************************************************/
31#define LOG_GROUP RTLOGGROUP_TIME
32#include <iprt/win/windows.h>
33
34#include <iprt/time.h>
35#include "internal/iprt.h"
36
37#include <iprt/assert.h>
38#include <iprt/errcore.h>
39#include "internal/time.h"
40
41#include "internal-r3-win.h"
42
43
44RTDECL(int) RTTimeSet(PCRTTIMESPEC pTime)
45{
46 FILETIME FileTime;
47 SYSTEMTIME SysTime;
48 if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTime, &FileTime), &SysTime))
49 {
50 if (SetSystemTime(&SysTime))
51 return VINF_SUCCESS;
52 }
53 return RTErrConvertFromWin32(GetLastError());
54}
55
56
57RTDECL(PRTTIME) RTTimeLocalExplode(PRTTIME pTime, PCRTTIMESPEC pTimeSpec)
58{
59 RTTIMESPEC LocalTime;
60 if (g_pfnSystemTimeToTzSpecificLocalTime)
61 {
62 /*
63 * FileTimeToLocalFileTime does not do the right thing, so we'll have
64 * to convert to system time and SystemTimeToTzSpecificLocalTime instead.
65 *
66 * Note! FileTimeToSystemTime drops resoultion down to milliseconds, thus
67 * we have to do the offUTC calculation using milliseconds and adjust
68 * u32Nanosecons by sub milliseconds digits.
69 */
70 SYSTEMTIME SystemTimeIn;
71 FILETIME FileTime;
72 if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTimeSpec, &FileTime), &SystemTimeIn))
73 {
74 SYSTEMTIME SystemTimeOut;
75 if (g_pfnSystemTimeToTzSpecificLocalTime(NULL /* use current TZI */, &SystemTimeIn, &SystemTimeOut))
76 {
77 if (SystemTimeToFileTime(&SystemTimeOut, &FileTime))
78 {
79 RTTimeSpecSetNtFileTime(&LocalTime, &FileTime);
80 pTime = RTTimeExplode(pTime, &LocalTime);
81 if (pTime)
82 {
83 pTime->fFlags = (pTime->fFlags & ~RTTIME_FLAGS_TYPE_MASK) | RTTIME_FLAGS_TYPE_LOCAL;
84 pTime->offUTC = (RTTimeSpecGetMilli(&LocalTime) - RTTimeSpecGetMilli(pTimeSpec)) / RT_MS_1MIN;
85 pTime->u32Nanosecond += RTTimeSpecGetNano(pTimeSpec) % RT_NS_1MS;
86 }
87 return pTime;
88 }
89 }
90 }
91 }
92
93 /*
94 * The fallback is to use the current offset.
95 * (A better fallback would be to use the offset of the same time of the year.)
96 */
97 LocalTime = *pTimeSpec;
98 int64_t cNsUtcOffset = RTTimeLocalDeltaNano();
99 RTTimeSpecAddNano(&LocalTime, cNsUtcOffset);
100 pTime = RTTimeExplode(pTime, &LocalTime);
101 if (pTime)
102 {
103 pTime->fFlags = (pTime->fFlags & ~RTTIME_FLAGS_TYPE_MASK) | RTTIME_FLAGS_TYPE_LOCAL;
104 pTime->offUTC = cNsUtcOffset / RT_NS_1MIN;
105 }
106 return pTime;
107}
108
109
110/**
111 * Gets the delta between UTC and local time at the given time.
112 *
113 * @code
114 * RTTIMESPEC LocalTime;
115 * RTTimeNow(&LocalTime);
116 * RTTimeSpecAddNano(&LocalTime, RTTimeLocalDeltaNanoFor(&LocalTime));
117 * @endcode
118 *
119 * @param pTimeSpec The time spec giving the time to get the delta for.
120 * @returns Returns the nanosecond delta between UTC and local time.
121 */
122RTDECL(int64_t) RTTimeLocalDeltaNanoFor(PCRTTIMESPEC pTimeSpec)
123{
124 RTTIMESPEC LocalTime;
125 if (g_pfnSystemTimeToTzSpecificLocalTime)
126 {
127 /*
128 * FileTimeToLocalFileTime does not do the right thing, so we'll have
129 * to convert to system time and SystemTimeToTzSpecificLocalTime instead.
130 *
131 * Note! FileTimeToSystemTime drops resoultion down to milliseconds, thus
132 * we have to do the offUTC calculation using milliseconds and adjust
133 * u32Nanosecons by sub milliseconds digits.
134 */
135 SYSTEMTIME SystemTimeIn;
136 FILETIME FileTime;
137 if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTimeSpec, &FileTime), &SystemTimeIn))
138 {
139 SYSTEMTIME SystemTimeOut;
140 if (g_pfnSystemTimeToTzSpecificLocalTime(NULL /* use current TZI */, &SystemTimeIn, &SystemTimeOut))
141 {
142 if (SystemTimeToFileTime(&SystemTimeOut, &FileTime))
143 {
144 RTTimeSpecSetNtFileTime(&LocalTime, &FileTime);
145
146 return (RTTimeSpecGetMilli(&LocalTime) - RTTimeSpecGetMilli(pTimeSpec)) * RT_NS_1MS;
147 }
148 }
149 }
150 }
151
152 return RTTimeLocalDeltaNano();
153}
154
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