If you're working under Solaris you can find out if a port/device is being used by issuing the fuser command.

Example: 

fuser /dev/cua/a
will return the process id that is using the port if such a process exists.

metadoktor

"The doktor is in."

In reply to Your question has too little information but..... by metadoktor
in thread Gain information about serial ports by Bloodelf

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