IOCTL_SERIAL_GET_STATS control code
The IOCTL_SERIAL_GET_STATS request returns information about the performance of a serial controller. The statistics include the number of characters transmitted, the number of characters received, and useful error statistics. The driver continuously increments performance values.
To reset the accumulated performance values to zero, a client can use an IOCTL_SERIAL_CLEAR_STATS request.
The Parameters.DeviceIoControl.OutputBufferLength member is set to the size, in bytes, of a SERIALPERF_STATS structure.
The AssociatedIrp.SystemBuffer member points to a client-allocated SERIALPERF_STATS structure that the serial controller driver uses to output performance information.
If the request succeeds, the Information member is set to the size, in bytes, of a SERIALPERF_STATS structure. Otherwise, the Information member is set to zero.
The Status member is set to one of the Generic Status Values for Serial Device Control Requests.