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From: ron@topaz.rutgers.edu (Ron Natalie)
Newsgroups: comp.unix.wizards
Subject: Re: Absolutly hanging up a modem
Message-ID: <15830@topaz.rutgers.edu>
Date: Thu, 22-Oct-87 15:41:41 EST
Article-I.D.: topaz.15830
Posted: Thu Oct 22 15:41:41 1987
Date-Received: Sun, 25-Oct-87 02:24:39 EST
References: <1548@bloom-beacon.MIT.EDU> <142700004@tiger.UUCP> <292@minya.UUCP>
Organization: Rutgers Univ., New Brunswick, N.J.
Lines: 8

There is no absolute way to do this on ALL unixes.  This is especially
complicated by people who want DTR to work only part of the time (they
use the same line for dial in/out).  Generally, if you have modem control
enabled on a UNIX line there are two ways to get the DTR to drop.  One
is to stty a speed of 0, and the other is to set the stty field HUPCL
and then makesure everyone who has the tty open closes it.

-Ron