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From: guy@sun.uucp (Guy Harris)
Newsgroups: net.bugs.usg
Subject: Undocumented TTY driver features
Message-ID: <3005@sun.uucp>
Date: Sun, 17-Nov-85 16:29:35 EST
Article-I.D.: sun.3005
Posted: Sun Nov 17 16:29:35 1985
Date-Received: Thu, 21-Nov-85 03:35:21 EST
Distribution: net
Organization: Sun Microsystems, Inc.
Lines: 10

The S3 and S5 manuals, and the S5 Interface Definition, tell you that the
TCXONC terminal "ioctl" call can be used to suspend output and restart it.
What they do *not* tell you is that it can also be used to suspend *input*
and restart it - i.e., that they can be used to control the blocking and
unblocking of input that the IXOFF mode (equivalent of TANDEM mode in
V7/4.xBSD) enables.  Add the following to the description of TCXONC:

	If "arg" is 2, suspend input; if 3, restart suspended input.

	Guy Harris