2.2.6.1 Cancel Request Message (CANCEL_REQUEST)
The CANCEL_REQUEST message is sent from the server to the client to cancel an outstanding IO request.
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RequestId |
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Header (variable): The SHARED_MSG_HEADER (as specified in section 2.2.1). The InterfaceId field MUST match the value sent previously in the UsbDevice field of the ADD_DEVICE message. The Mask field MUST be set to STREAM_ID_PROXY. The FunctionId field MUST be set to CANCEL_REQUEST (0x00000100).
RequestId (4 bytes): A 32-bit unsigned integer. This value represents the ID of a request previously sent via IO_CONTROL, INTERNAL_IO_CONTROL, TRANSFER_IN_REQUEST, or TRANSFER_OUT_REQUEST message.