Re: /dev/cua? Vs /dev/ttyS?

Mardy Hutchinson (
Tue, 14 May 1996 10:47:18 -0400

At 01:51 PM 5/13/96 -0400, Theodore Y. Ts'o wrote:

>I originally implemented the cuaXX/ttySXX lockout mechanism back before
>FSSTND established a standard convention for the use of tty lock files.
>Now that it's there, people should use the tty lock files and not try
>using /dev/cuaXX. The only reason why /dev/cuaXX hasn't disappeared yet
>is for backwards compatibility reasons.


There is one other reason to keep the cua devices: If you want to use
setserial to change the parameters of a port that is open (usually with an
idle getty on it...), then the cua device is available, when the ttyS device
is not.
-- Mardy