perl serial port access

[Kliment Andreev]

> What is the name of the /dev for the serial port in FreeBSD. dmesg says
> there are sio0 and sio1 but there are no such file names in /dev.
Most devices in the kernel are accessed through ``device special files'',
which are located in the /dev directory. The sio devices are accessed
through the /dev/ttydN (dial-in) and /dev/cuaaN (call-out) devices. FreeBSD
also provides initialization devices (/dev/ttyidN and /dev/cuaiaN) and
locking devices (/dev/ttyldN and /dev/cualaN).....and so on (handbook)