pty bugs & features

[Guy Harris]

>This is the correct behavior. The difficulties with locking up tty ports
>are reflections of two different problems: first, that ptys aren't
>dynamically allocated in 4BSD; and second, that standard ttys exist at
>all. Hardwired /dev/tty* should be replaced with raw /dev/modem* and so
>on; *all* tty use should go through a common interface provided by a
>pseudo-terminal session manager.

Even "ttys", i.e.  serial ports, to which, say, a printer or plotter is
attached?

What happens if, for whatever reason, a ^Q sent by said printer or
plotter is lost?  Is the idea that you detach the printer from the
session, attach the session to a regular terminal, and type ^Q at it?