Serial Internal Device Control Requests
This reference section describes the four internal device control requests that are supported by the inbox serial driver, Serial.sys. These requests are provided for trusted kernel-mode drivers.
No other internal device control requests are supported by Serial.sys.
Note These requests are not supported by versions 1 and 2 of the serial framework extension (SerCx and SerCx2).
The setting of the I/O Status Block members is request-specific. If Serial.sys does not support the request, it sets the Information member to zero and the Status member to STATUS_INVALID_PARAMETER.