From: utzoo!decvax!cca!mark.umcp-cs@UDel-Relay@sri-unix
Newsgroups: net.unix-wizards
Title: TIOCIOANS, TIOCSIGNAL
Article-I.D.: sri-unix.3113
Posted: Sat Sep  4 18:39:04 1982
Received: Wed Sep  8 06:26:09 1982

From:     Mark Weiser 
Date:     1 Sep 82 22:38:12-EDT (Wed)
TIOCIOANS and TIOCSIGNAL are for multiplexed files, a wonderful feature
of Unix which allows a user program to pretend to be the tty driver.
Berkeley says it will go away in 4.2, and I hope they provide something
with the almost total transparency these things have.