RtlClearAllBits function (wdm.h)

Article
02/22/2024

The RtlClearAllBits routine sets all bits in a given bitmap variable to zero.

Syntax

NTSYSAPI VOID RtlClearAllBits(
  [in] PRTL_BITMAP BitMapHeader
);

Parameters

[in] BitMapHeader

A pointer to the RTL_BITMAP structure that describes the bitmap. This structure must have been initialized by the RtlInitializeBitMap routine.

Return value

None

Remarks

Callers of RtlClearAllBits must be running at IRQL <= APC_LEVEL if the memory that contains the bitmap variable is pageable or the memory at BitMapHeader is pageable. Otherwise, RtlClearAllBits can be called at any IRQL.

Requirements

Requirement	Value
Minimum supported client	Available starting with Windows 2000.
Target Platform	Universal
Header	wdm.h (include Wdm.h, Ntddk.h, Ntifs.h)
Library	NtosKrnl.lib
DLL	NtosKrnl.exe (kernel mode); Ntdll.dll (user mode)
IRQL	<= APC_LEVEL (See Remarks section)