WdfRequestSetUserModeDriverInitiatedIo function (wdfrequest.h)
[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(
[in] WDFREQUEST Request,
[in] BOOLEAN IsUserModeDriverInitiated
);
Parameters
[in] Request
A handle to a framework request object.
[in] 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
None
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
| Requirement | Value |
|---|---|
| Minimum supported client | 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 |