>One way to totally lock up the I/O ports is to do the following:
>
>1) Set XON/XOFF flow control on the port (stty says " ixon")
>2) Connect
>3) Get the remote end of the link to send a ^S (XOFF).
>
>BOOM!  That port (and any process that has it open) is hung until you
>reboot, unless the remote end sends a ^Q (XON).
>
>I do not consider this to be a bug in the com driver, but that doesn't
>keep it from being annoying.

I think the com driver should at least clear out this condition upon a close,
rather than hanging the process solid.

--Ken