NdisUnmapFile (NDIS 5.1) function

Article
06/19/2017

Note NDIS 5. x has been deprecated and is superseded by NDIS 6. x. For new NDIS driver development, see Network Drivers Starting with Windows Vista. For information about porting NDIS 5. x drivers to NDIS 6. x, see Porting NDIS 5.x Drivers to NDIS 6.0.

NdisUnmapFile releases a virtual address mapping of a file previously set up with NdisMapFile.

Syntax

VOID NdisUnmapFile(
  _In_ NDIS_HANDLE FileHandle
);

Parameters

FileHandle [in]
Specifies the handle returned by NdisOpenFile.

Return value

None

Remarks

To reduce resource usage, a NIC driver should always call NdisUnmapFile when it no longer needs exclusive access to the contents of a file that it opened. Such a driver can map and unmap the file as necessary, using alternating calls to NdisMapFile and NdisUnmapFile until it releases the file handle with NdisCloseFile.

Requirements

Target platform	Universal
Version	See NdisUnmapFile.
Header	Ndis.h (include Ndis.h)
Library	Ndis.lib
IRQL	PASSIVE_LEVEL

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