IOCTL_SERIAL_GET_HANDFLOW control code
The IOCTL_SERIAL_GET_HANDFLOW request returns information about the configuration of the handshake flow control set for a serial device.
To set the configuration of the handshake flow control, a client can use an IOCTL_SERIAL_SET_HANDFLOW request.
For more information about the settings for handshake flow control, see SERIAL_HANDFLOW.
The Parameters.DeviceIoControl.OutputBufferLength member is set to the size, in bytes, of a SERIAL_HANDFLOW structure.
The AssociatedIrp.SystemBuffer member points to a client-allocated SERIAL_HANDFLOW structure that the serial controller driver uses to output information about the configuration of handshake flow control.
If the request is successful, the Information member is set to the size, in bytes, of a SERIAL_HANDFLOW 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.