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
  28 /* FUNCTIONS ****************************************************************/
  29
  30 VOID
  31 ExInitTimeZoneInfo (VOID)
  32 {
  33   /* Initialize system time zone information */
  34   memset (&SystemTimeZoneInfo, 0, sizeof(TIME_ZONE_INFORMATION));
  35
  36   /* FIXME: Read time zone information from the registry */
  37
  38 }
  39
  40
  41 NTSTATUS
  42 STDCALL
  43 NtSetSystemTime (
  44         IN      PLARGE_INTEGER  SystemTime,
  45         IN      PLARGE_INTEGER  NewSystemTime   OPTIONAL
  46         )
  47 {
  48 //        HalSetRealTimeClock ((PTIME)SystemTime);
  49 //        UNIMPLEMENTED;
  50         return STATUS_SUCCESS;
  51 }
  52
  53
  54 NTSTATUS
  55 STDCALL
  56 NtQuerySystemTime (
  57         OUT     TIME    * CurrentTime
  58         )
  59 {
  60         KeQuerySystemTime((PLARGE_INTEGER)CurrentTime);
  61         return STATUS_SUCCESS;
  62 }
  63
  64
  65 VOID
  66 ExLocalTimeToSystemTime (
  67         PLARGE_INTEGER  LocalTime,
  68         PLARGE_INTEGER  SystemTime
  69         )
  70 {
  71    SystemTime->QuadPart = LocalTime->QuadPart +
  72                           SystemTimeZoneInfo.Bias * TICKSPERMINUTE;
  73 }
  74
  75
  76 VOID
  77 ExSystemTimeToLocalTime (
  78         PLARGE_INTEGER  SystemTime,
  79         PLARGE_INTEGER  LocalTime
  80         )
  81 {
  82    LocalTime->QuadPart = SystemTime->QuadPart -
  83                          SystemTimeZoneInfo.Bias * TICKSPERMINUTE;
  84 }
  85
  86 /* EOF */