reactos/ntoskrnl/ex/time.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS kernel
   4  * FILE:            kernel/excutive/time.c
   5  * PURPOSE:         Time
   6  * PROGRAMMER:      David Welch (welch@mcmail.com)
   7  * UPDATE HISTORY:
   8  *                  Created 22/05/98
   9  */
  10
  11 /* INCLUDES *****************************************************************/
  12
  13 #include <ddk/ntddk.h>
  14
  15 #include <internal/debug.h>
  16
  17
  18 #define TICKSPERMINUTE  600000000
  19
  20 /* GLOBALS ******************************************************************/
  21
  22 static LONG lTimeZoneBias = 0;  /* bias[minutes] = UTC - local time */
  23
  24 /* FUNCTIONS ****************************************************************/
  25
  26 NTSTATUS STDCALL NtSetSystemTime(IN PLARGE_INTEGER SystemTime,
  27                                  IN PLARGE_INTEGER NewSystemTime OPTIONAL)
  28 {
  29    return(ZwSetSystemTime(SystemTime,NewSystemTime));
  30 }
  31
  32 NTSTATUS STDCALL ZwSetSystemTime(IN PLARGE_INTEGER SystemTime,
  33                                  IN PLARGE_INTEGER NewSystemTime OPTIONAL)
  34 {
  35    UNIMPLEMENTED;
  36 }
  37
  38 NTSTATUS STDCALL NtQuerySystemTime (OUT TIME *CurrentTime)
  39 {
  40    return(ZwQuerySystemTime(CurrentTime));
  41 }
  42
  43 NTSTATUS STDCALL ZwQuerySystemTime (OUT TIME *CurrentTime)
  44 {
  45    KeQuerySystemTime((PLARGE_INTEGER)CurrentTime);
  46    return STATUS_SUCCESS;
  47 //   UNIMPLEMENTED;
  48 }
  49
  50 VOID ExLocalTimeToSystemTime(PLARGE_INTEGER LocalTime,
  51                              PLARGE_INTEGER SystemTime)
  52 {
  53    SystemTime->QuadPart = LocalTime->QuadPart +
  54                           lTimeZoneBias * TICKSPERMINUTE;
  55 }
  56
  57 VOID ExSystemTimeToLocalTime(PLARGE_INTEGER SystemTime,
  58                              PLARGE_INTEGER LocalTime)
  59 {
  60    LocalTime->QuadPart = SystemTime->QuadPart -
  61                          lTimeZoneBias * TICKSPERMINUTE;
  62 }