I use the serial ports in linux as they are /dev/ttySXX and now find myself using a macbook.
When firing up my java application, I get a PortInUse Exception. From what I understand this means I cannot put a lock on the port. It stops me from loading the serial port classes.
I am using rxtx packages on the java side of things: http://rxtx.org
I thought it was a permissions issue, so I've made the port /dev/tty.PL2303-0000101D world readable/writable/executable. No progress though :(
You should check the RXTX mailing list. You need the 2.1-8 source from RXTX CVS, since 2.1-7 uses lock files which aren't used by MacOS X.
After one year, I re-installed osx and had the same problem! I googled the message and thought GREAT! someone else has had the same problem ... then I reached my message from last year.
So, to overcome it, I just had to:
chmod 755 /var/spool/uucp
chmod 777 /var/lock
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