Serial Mouse is attached or not attached at seiral port
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So if data is available from the mouse then the message is that Now you are ready and if there is no data then Till You are not ready message is continously on the screen at the given time interval.
So what should I have to do to come out the loop when data is just received by the select fucntion or not to come out the loop when there is no mouse and then data is not received by the select function.
No offense intended, but it sounds like you're trying to re-invent the wheel. And IMHO, it probably just won't work.
First, the serial mouse does not send anything. It is read by the device driver.
Secondly, it is not a PnP device; it is only detected at system startup. IOW you can unplug and replug the serial mouse at will and BIOS nor the OS will recognize that.
Lastly, if you could write a program that persistantly monitored the serial port for device connection/disconnection, it would be painfully slow, as it would need to constantly be jumping back into the detection loop.