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 #include <internal/ex.h>
  15 #include <string.h>
  16
  17 #include <internal/debug.h>
  18
  19
  20 #define TICKSPERMINUTE  600000000
  21
  22 /* GLOBALS ******************************************************************/
  23
  24 /* Note: Bias[minutes] = UTC - local time */
  25 TIME_ZONE_INFORMATION SystemTimeZoneInfo;
  26
  27 /* FUNCTIONS ****************************************************************/
  28
  29 VOID
  30 ExInitTimeZoneInfo (VOID)
  31 {
  32   /* Initialize system time zone information */
  33   memset (&SystemTimeZoneInfo, 0, sizeof(TIME_ZONE_INFORMATION));
  34
  35   /* FIXME: Read time zone information from the registry */
  36
  37 }
  38
  39 NTSTATUS
  40 STDCALL
  41 NtSetSystemTime (
  42         IN      PLARGE_INTEGER  SystemTime,
  43         IN      PLARGE_INTEGER  NewSystemTime   OPTIONAL
  44         )
  45 {
  46         UNIMPLEMENTED;
  47 }
  48
  49
  50 NTSTATUS
  51 STDCALL
  52 NtQuerySystemTime (
  53         OUT     TIME    * CurrentTime
  54         )
  55 {
  56         KeQuerySystemTime((PLARGE_INTEGER)CurrentTime);
  57         return STATUS_SUCCESS;
  58 }
  59
  60
  61 VOID
  62 STDCALL
  63 ExLocalTimeToSystemTime (
  64         PLARGE_INTEGER  LocalTime,
  65         PLARGE_INTEGER  SystemTime
  66         )
  67 {
  68    SystemTime->QuadPart = LocalTime->QuadPart +
  69                           SystemTimeZoneInfo.Bias * TICKSPERMINUTE;
  70 }
  71
  72
  73 VOID
  74 STDCALL
  75 ExSystemTimeToLocalTime (
  76         PLARGE_INTEGER  SystemTime,
  77         PLARGE_INTEGER  LocalTime
  78         )
  79 {
  80    LocalTime->QuadPart = SystemTime->QuadPart -
  81                          SystemTimeZoneInfo.Bias * TICKSPERMINUTE;
  82 }
  83
  84 /* EOF */