reactos/ntoskrnl/se/luid.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            ntoskrnl/se/luid.c
   6  * PURPOSE:         Security manager
   7  *
   8  * PROGRAMMERS:     No programmer listed.
   9  */
  10
  11 /* INCLUDES *****************************************************************/
  12
  13 #include <ntoskrnl.h>
  14 #include <internal/debug.h>
  15
  16 /* GLOBALS *******************************************************************/
  17
  18 static KSPIN_LOCK LuidLock;
  19 static LARGE_INTEGER LuidIncrement;
  20 static LARGE_INTEGER LuidValue;
  21
  22 /* FUNCTIONS *****************************************************************/
  23
  24 VOID INIT_FUNCTION
  25 SepInitLuid(VOID)
  26 {
  27   LARGE_INTEGER DummyLuidValue = SYSTEM_LUID;
  28
  29   KeInitializeSpinLock(&LuidLock);
  30   LuidValue = DummyLuidValue;
  31   LuidIncrement.QuadPart = 1;
  32 }
  33
  34
  35 /*
  36  * @implemented
  37  */
  38 NTSTATUS STDCALL
  39 NtAllocateLocallyUniqueId(OUT LUID *LocallyUniqueId)
  40 {
  41   LARGE_INTEGER ReturnedLuid;
  42   KIRQL Irql;
  43
  44   KeAcquireSpinLock(&LuidLock,
  45                     &Irql);
  46   ReturnedLuid = LuidValue;
  47   LuidValue = RtlLargeIntegerAdd(LuidValue,
  48                                  LuidIncrement);
  49   KeReleaseSpinLock(&LuidLock,
  50                     Irql);
  51
  52   LocallyUniqueId->LowPart = ReturnedLuid.u.LowPart;
  53   LocallyUniqueId->HighPart = ReturnedLuid.u.HighPart;
  54
  55   return(STATUS_SUCCESS);
  56 }
  57
  58
  59 /*
  60  * @implemented
  61  */
  62 VOID STDCALL
  63 RtlCopyLuid(IN PLUID LuidDest,
  64             IN PLUID LuidSrc)
  65 {
  66   LuidDest->LowPart = LuidSrc->LowPart;
  67   LuidDest->HighPart = LuidSrc->HighPart;
  68 }
  69
  70
  71 /*
  72  * @implemented
  73  */
  74 BOOLEAN STDCALL
  75 RtlEqualLuid(IN PLUID Luid1,
  76              IN PLUID Luid2)
  77 {
  78   return (Luid1->LowPart == Luid2->LowPart &&
  79           Luid1->HighPart == Luid2->HighPart);
  80 }
  81
  82 /* EOF */