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.
Input Buffer Length
The AssociatedIrp.SystemBuffer member points to a client-allocated SERIALPERF_STATS structure that the serial controller driver uses to output performance information.
Output Buffer Length
The Parameters.DeviceIoControl.OutputBufferLength member is set to the size, in bytes, of a SERIALPERF_STATS structure.
Input / Output Buffer
Input / Output Buffer Length
Irp->IoStatus.Status is set to STATUS_SUCCESS if the request is successful. Otherwise, Status to the appropriate error condition as a NTSTATUS code.
|Header||ntddser.h (include Ntddser.h)|