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The client driver sends this request to determine general characteristics about a USB device, such as maximum send and receive delays for any request.
Major code
Input / Output buffer
The AssociatedIrp.SystemBuffer member is a pointer to a caller-allocated USB_DEVICE_CHARACTERISTICS structure. On input, set Version to USB_DEVICE_CHARACTERISTICS_VERSION_1. On output Version is reset to a version less than or equal to USB_DEVICE_CHARACTERISTICS_VERSION_1; UsbDeviceCharacteristicsFlags is set to USB_DEVICE_CHARACTERISTICS_MAXIMUM_PATH_DELAYS_AVAILABLE and the remaining members of the structure is filled with delay information.
Input / Output buffer length
The size of the USB_DEVICE_CHARACTERISTICS structure.
Status block
Irp->IoStatus.Status is set to STATUS_SUCCESS if the request is successful. Otherwise, Status indicates the appropriate error condition as a NTSTATUS code.
Requirements
| Requirement | Value |
|---|---|
| Header | usbioctl.h |
| IRQL | <=DISPATCH_LEVEL |
See also
Creating IOCTL Requests in Drivers
USB client drivers for Media-Agnostic (MA-USB)
WdfIoTargetSendInternalIoctlOthersSynchronously