WdfRequestSetUserModeDriverInitiatedIo - NtDoc
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// wdfrequest.h
VOID WdfRequestSetUserModeDriverInitiatedIo(
[in] WDFREQUEST Request,
[in] BOOLEAN IsUserModeDriverInitiated
);
View the official Windows Driver Kit DDI referenceNo description available.
[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.
Request [in]A handle to a framework request object.
IsUserModeDriverInitiated [in]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.
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.
WdfRequestGetUserModeDriverInitiatedIo