IOCTL_SERIAL_GET_STATS IOCTL

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.

Major Code

IRP_MJ_DEVICE_CONTROL

Input Buffer

None.

Input Buffer Length

None.

Output Buffer

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

Status Block

Irp->IoStatus.Status is set to STATUS_SUCCESS if the request is successful. Otherwise, Status to the appropriate error condition as a NTSTATUS code.

Requirements

   
Header ntddser.h (include Ntddser.h)

See Also

IOCTL_SERIAL_CLEAR_STATS

SERIALPERF_STATS