serial port driver - testing flow control?

[Arun Srinivasan <arunlkml@xxxxxxxxx>]

I have enabled hardware flow control for the serial port (say /dev/ttyS0). I need to test whether the flow control is actually being carried on by the driver to the end device using the serial port.

So can somebody suggest me how I can test this? 
i.e., see if the flow control actually takes place between the OS (serial port driver) and the serial port device? 

-- 
"There are 10 people in the world - those who understand binary and those who dont !"