RtlClearBit function (wdm.h)
The RtlClearBit routine sets the specified bit in a bitmap to zero.
Syntax
NTSYSAPI VOID RtlClearBit(
[in] PRTL_BITMAP BitMapHeader,
[in] ULONG BitNumber
);
Parameters
[in] BitMapHeader
A pointer to the RTL_BITMAP structure that describes the bitmap. This structure must have been initialized by the RtlInitializeBitMap routine.
[in] BitNumber
Specifies the zero-based index of the bit within the bitmap. The routine sets this bit to zero.
Return value
None
Remarks
Callers of RtlClearBit 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, RtlClearBit can be called at any IRQL.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows XP and later versions of Windows. |
| Target Platform | Universal |
| Header | wdm.h (include Wdm.h, Ntddk.h, Ntifs.h) |
| Library | NtosKrnl.lib |
| DLL | NtosKrnl.exe |
| IRQL | <= APC_LEVEL (See Remarks section) |