reactos/ntoskrnl/ex/time.c

   1 /* $Id: time.c,v 1.22 2004/11/05 11:46:02 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 _SystemTimeZoneInfo;
  24
  25
  26 /* FUNCTIONS ****************************************************************/
  27
  28 VOID INIT_FUNCTION
  29 ExInitTimeZoneInfo (VOID)
  30 {
  31   /* Initialize system time zone information */
  32   memset (& _SystemTimeZoneInfo, 0, sizeof(TIME_ZONE_INFORMATION));
  33
  34   /* FIXME: Read time zone information from the registry */
  35
  36 }
  37
  38
  39 NTSTATUS STDCALL
  40 NtSetSystemTime(IN PLARGE_INTEGER UnsafeNewSystemTime,
  41                 OUT PLARGE_INTEGER UnsafeOldSystemTime OPTIONAL)
  42      /*
  43       * FUNCTION: Sets the system time.
  44       * PARAMETERS:
  45       *        NewTime - Points to a variable that specified the new time
  46       *        of day in the standard time format.
  47       *        OldTime - Optionally points to a variable that receives the
  48       *        old time of day in the standard time format.
  49       * RETURNS: Status
  50       */
  51 {
  52   NTSTATUS Status;
  53   LARGE_INTEGER OldSystemTime;
  54   LARGE_INTEGER NewSystemTime;
  55   TIME_FIELDS TimeFields;
  56
  57   /* FIXME: Check for SeSystemTimePrivilege */
  58
  59   if (UnsafeNewSystemTime == NULL)
  60     {
  61       /* FIXME: update time zone settings */
  62
  63       return STATUS_SUCCESS;
  64     }
  65
  66   Status = MmCopyFromCaller(&NewSystemTime, UnsafeNewSystemTime,
  67                             sizeof(NewSystemTime));
  68   if (!NT_SUCCESS(Status))
  69     {
  70       return(Status);
  71     }
  72
  73   if (UnsafeOldSystemTime != NULL)
  74     {
  75       KeQuerySystemTime(&OldSystemTime);
  76     }
  77   RtlTimeToTimeFields (&NewSystemTime, &TimeFields);
  78   HalSetRealTimeClock (&TimeFields);
  79
  80   if (UnsafeOldSystemTime != NULL)
  81     {
  82       Status = MmCopyToCaller(UnsafeOldSystemTime, &OldSystemTime,
  83                               sizeof(OldSystemTime));
  84       if (!NT_SUCCESS(Status))
  85         {
  86           return(Status);
  87         }
  88     }
  89   return(STATUS_SUCCESS);
  90 }
  91
  92
  93 NTSTATUS STDCALL
  94 NtQuerySystemTime (OUT PLARGE_INTEGER UnsafeCurrentTime)
  95      /*
  96       * FUNCTION: Retrieves the system time.
  97       * PARAMETERS:
  98       *          CurrentTime - Points to a variable that receives the current
  99       *          time of day in the standard time format.
 100       */
 101 {
 102   LARGE_INTEGER CurrentTime;
 103   NTSTATUS Status;
 104
 105   KeQuerySystemTime(&CurrentTime);
 106   Status = MmCopyToCaller(UnsafeCurrentTime, &CurrentTime,
 107                           sizeof(CurrentTime));
 108   if (!NT_SUCCESS(Status))
 109     {
 110       return(Status);
 111     }
 112   return STATUS_SUCCESS;
 113 }
 114
 115
 116 /*
 117  * @implemented
 118  */
 119 VOID
 120 STDCALL
 121 ExLocalTimeToSystemTime (
 122         PLARGE_INTEGER  LocalTime,
 123         PLARGE_INTEGER  SystemTime
 124         )
 125 {
 126    SystemTime->QuadPart = LocalTime->QuadPart +
 127                           _SystemTimeZoneInfo.Bias * TICKSPERMINUTE;
 128 }
 129
 130 /*
 131  * @unimplemented
 132  */
 133 VOID
 134 STDCALL
 135 ExSetTimerResolution (
 136     IN ULONG DesiredTime,
 137     IN BOOLEAN SetResolution
 138     )
 139 {
 140         UNIMPLEMENTED;
 141 }
 142
 143 /*
 144  * @implemented
 145  */
 146 VOID
 147 STDCALL
 148 ExSystemTimeToLocalTime (
 149         PLARGE_INTEGER  SystemTime,
 150         PLARGE_INTEGER  LocalTime
 151         )
 152 {
 153    LocalTime->QuadPart = SystemTime->QuadPart -
 154                          _SystemTimeZoneInfo.Bias * TICKSPERMINUTE;
 155 }
 156
 157 /* EOF */