controlling terminal is a vnode

cleanups, add ^T prototype, CIGNORE instead of separate ioctls

merge in vnodes

clocal, nonblock, other carrier related stuff

use new form of suser()

../machine => machine

new terminal driver

lint

minor fix in ^X where rocount != rawq.c_cc

typo

fix CTRL macro; for ANSI C

avoid call through zero (t_oproc) when certain flags are set on a pty

call ttystart before checking for queue overflow,
instead of afterward (if it's synchronous, we hang); call driver oproc
at normal priority, and let it check for timeout,etc (they all do anyway).

delete unneeded header files

don't let uprintf be interrupted (callers hold locked inodes, etc)

TIOCCONS

merge in tahoe support

add substitutable cnputc, user console

4.3BSD release version

lint

don't flush when not changing line disciplines

let's get it all

move nullmodem to tty.c, maintain TS_CARR_ON

use modem entry in linesw to signal carrier change; split line-disc close
from tty close

use sigmask() instead of private definitions