RtlTestBit - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
#ifndef _NTRTL_H

_Check_return_
NTSYSAPI
BOOLEAN
NTAPI
RtlTestBit(
    _In_ PRTL_BITMAP BitMapHeader,
    _In_range_(<, BitMapHeader->SizeOfBitMap) ULONG BitNumber
    );

#endif

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// wdm.h

NTSYSAPI BOOLEAN RtlTestBit(
  [in] PRTL_BITMAP BitMapHeader,
  [in] ULONG       BitNumber
);
View the official Windows Driver Kit DDI reference

NtDoc

This function is documented in Windows Driver Kit.

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Windows Driver Kit DDI reference (nf-wdm-rtltestbit)

RtlTestBit function

Description

The RtlTestBit routine returns the value of a bit in a bitmap.

Parameters

BitMapHeader [in]

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

BitNumber [in]

Specifies the zero-based index of the bit within the bitmap. The routine returns the value of this bit.

Return value

RtlTestBit returns the value of the bit that the BitNumber parameter points to.

Remarks

Callers of RtlTestBit 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, RtlTestBit can be called at any IRQL.

See also

RTL_BITMAP

RtlInitializeBitMap

View the official Windows Driver Kit DDI reference

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