reactos/ntoskrnl/ex/time.c

   1 /* $Id: time.c,v 1.23 2004/11/05 17:42:20 ekohl Exp $
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            ntoskrnl/ex/time.c
   6  * PURPOSE:         Time
   7  * PROGRAMMER:      David Welch (welch@mcmail.com)
   8  * UPDATE HISTORY:
   9  *                  Created 22/05/98
  10  */
  11
  12 /* INCLUDES *****************************************************************/
  13
  14 #include <ntoskrnl.h>
  15 #include <internal/debug.h>
  16
  17
  18 #define TICKSPERMINUTE  600000000
  19
  20 /* GLOBALS ******************************************************************/
  21
  22 /* Note: Bias[minutes] = UTC - local time */
  23 TIME_ZONE_INFORMATION ExpTimeZoneInfo;
  24
  25
  26 /* FUNCTIONS ****************************************************************/
  27
  28 VOID INIT_FUNCTION
  29 ExpInitTimeZoneInfo(VOID)
  30 {
  31   NTSTATUS Status;
  32
  33   /* Read time zone information from the registry */
  34   Status = RtlQueryTimeZoneInformation(&ExpTimeZoneInfo);
  35   if (!NT_SUCCESS(Status))
  36     {
  37       memset(&ExpTimeZoneInfo, 0, sizeof(TIME_ZONE_INFORMATION));
  38
  39     }
  40 }
  41
  42
  43 /*
  44  * FUNCTION: Sets the system time.
  45  * PARAMETERS:
  46  *        NewTime - Points to a variable that specified the new time
  47  *        of day in the standard time format.
  48  *        OldTime - Optionally points to a variable that receives the
  49  *        old time of day in the standard time format.
  50  * RETURNS: Status
  51  */
  52 NTSTATUS STDCALL
  53 NtSetSystemTime(IN PLARGE_INTEGER UnsafeNewSystemTime,
  54                 OUT PLARGE_INTEGER UnsafeOldSystemTime OPTIONAL)
  55 {
  56   NTSTATUS Status;
  57   LARGE_INTEGER OldSystemTime;
  58   LARGE_INTEGER NewSystemTime;
  59   TIME_FIELDS TimeFields;
  60
  61   /* FIXME: Check for SeSystemTimePrivilege */
  62
  63   if (UnsafeNewSystemTime == NULL)
  64     {
  65       /* FIXME: update time zone settings */
  66
  67       return STATUS_SUCCESS;
  68     }
  69
  70   Status = MmCopyFromCaller(&NewSystemTime, UnsafeNewSystemTime,
  71                             sizeof(NewSystemTime));
  72   if (!NT_SUCCESS(Status))
  73     {
  74       return(Status);
  75     }
  76
  77   if (UnsafeOldSystemTime != NULL)
  78     {
  79       KeQuerySystemTime(&OldSystemTime);
  80     }
  81   RtlTimeToTimeFields (&NewSystemTime, &TimeFields);
  82   HalSetRealTimeClock (&TimeFields);
  83
  84   if (UnsafeOldSystemTime != NULL)
  85     {
  86       Status = MmCopyToCaller(UnsafeOldSystemTime, &OldSystemTime,
  87                               sizeof(OldSystemTime));
  88       if (!NT_SUCCESS(Status))
  89         {
  90           return(Status);
  91         }
  92     }
  93   return(STATUS_SUCCESS);
  94 }
  95
  96
  97 /*
  98  * FUNCTION: Retrieves the system time.
  99  * PARAMETERS:
 100  *          CurrentTime - Points to a variable that receives the current
 101  *          time of day in the standard time format.
 102  */
 103 NTSTATUS STDCALL
 104 NtQuerySystemTime(OUT PLARGE_INTEGER UnsafeCurrentTime)
 105 {
 106   LARGE_INTEGER CurrentTime;
 107   NTSTATUS Status;
 108
 109   KeQuerySystemTime(&CurrentTime);
 110   Status = MmCopyToCaller(UnsafeCurrentTime, &CurrentTime,
 111                           sizeof(CurrentTime));
 112   if (!NT_SUCCESS(Status))
 113     {
 114       return(Status);
 115     }
 116   return STATUS_SUCCESS;
 117 }
 118
 119
 120 /*
 121  * @implemented
 122  */
 123 VOID
 124 STDCALL
 125 ExLocalTimeToSystemTime (
 126         PLARGE_INTEGER  LocalTime,
 127         PLARGE_INTEGER  SystemTime
 128         )
 129 {
 130    SystemTime->QuadPart = LocalTime->QuadPart;
 131 #if 0
 132  +
 133                           ExpTimeZoneInfo.Bias * TICKSPERMINUTE;
 134 #endif
 135 }
 136
 137
 138 /*
 139  * @unimplemented
 140  */
 141 VOID
 142 STDCALL
 143 ExSetTimerResolution (
 144     IN ULONG DesiredTime,
 145     IN BOOLEAN SetResolution
 146     )
 147 {
 148         UNIMPLEMENTED;
 149 }
 150
 151
 152 /*
 153  * @implemented
 154  */
 155 VOID
 156 STDCALL
 157 ExSystemTimeToLocalTime (
 158         PLARGE_INTEGER  SystemTime,
 159         PLARGE_INTEGER  LocalTime
 160         )
 161 {
 162    LocalTime->QuadPart = SystemTime->QuadPart;
 163 #if 0
 164  -
 165                          ExpTimeZoneInfo.Bias * TICKSPERMINUTE;
 166 #endif
 167 }
 168
 169 /* EOF */