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.\" Copyright (c) 2001
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2001-07-11 08:59:10 +00:00
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.\" The FreeBSD Project
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2001-07-08 04:35:21 +00:00
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 7, 2001
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.Dt NMDM 4
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.Os
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.Sh NAME
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.Nm nmdm
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.Nd nullmodem terminal driver
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.Sh SYNOPSIS
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.Cd "device nmdm"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for a device-pair termed a
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.Em null modem pair .
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A null modem pair is a pair of character devices.
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Each device provides to a process an interface identical
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to that described in
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.Xr tty 4 .
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However, whereas most other devices which provide the
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interface described in
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.Xr tty 4
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have a hardware device of some sort behind them, the
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.Nm
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device has, instead, another process manipulating
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it through the other half of the pair.
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That is, anything written on the first device is
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given to the second device as input and anything written
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on the second device is presented as input on the first
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device.
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.Sh FILES
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.Bl -tag -width /dev/nmdm[N][AB] -compact
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.It Pa /dev/nmdm Ns Ar N Ns Op Pa AB
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nullmodem device nodes.
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Where the
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.Pa A
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node has a matching
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.Pa B
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node.
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.El
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.Sh DIAGNOSTICS
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None.
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.Sh SEE ALSO
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.Xr tty 4
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.Sh HISTORY
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The
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.Nm
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2001-08-11 00:59:40 +00:00
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driver first appeared in
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.Fx 4.4 .
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