WdfRequestSetUserModeDriverInitiatedIo function

[Applies to UMDF only]

The WdfRequestSetUserModeDriverInitiatedIo method indicates to kernel-mode drivers that sit below the UMDF driver in the same device stack that a particular request should be treated as though it came from a UMDF driver.

Syntax

void WdfRequestSetUserModeDriverInitiatedIo(
  WDFREQUEST Request,
  BOOLEAN    IsUserModeDriverInitiated
);

Parameters

Request

A handle to a framework request object.

IsUserModeDriverInitiated

A Boolean value that, if TRUE, indicates that the request should be treated as though it was initiated by a UMDF driver. If FALSE, this parameter indicates that the request should be treated as though it came from an application.

Return Value

This method does not return a value.

Remarks

If a UMDF driver calls this method with the IsUserModeDriverInitiated parameter set to TRUE, the framework sets the IRP_UM_DRIVER_INITIATED_IO flag in the Flags member of the WDM IRP structure before forwarding the request to kernel-mode drivers.

A kernel-mode driver that resides below the UMDF driver in the same device stack can check for this flag to determine if the request should be treated as though initiated by a UMDF driver.

This flag is not applicable to kernel-mode drivers that might receive a request from a UMDF driver via a file-handle I/O target or a Win32 I/O target.

A UMDF driver might set the IsUserModeDriverInitiated parameter to TRUE for a request that came from an application if the driver has validated the request.

Requests that the driver created on its own are already marked as having originated from a UMDF driver.

Requirements

   
Windows version Windows 8.1
Target Platform Universal
Minimum UMDF version 2.0
Header wdfrequest.h (include Wdf.h)
Library WUDFx02000.lib; WUDFx02000.dll
IRQL PASSIVE_LEVEL

See Also

WdfRequestGetUserModeDriverInitiatedIo