2001-07-08 04:35:21 +00:00
|
|
|
.\" Copyright (c) 2001
|
2001-07-11 08:59:10 +00:00
|
|
|
.\" The FreeBSD Project
|
2001-07-08 04:35:21 +00:00
|
|
|
.\"
|
|
|
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
|
|
|
.\" modification, are permitted provided that the following conditions
|
|
|
|
|
.\" are met:
|
|
|
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
|
|
|
.\"
|
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
|
|
|
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
|
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
|
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
|
|
|
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
|
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
|
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
|
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
|
|
|
.\" SUCH DAMAGE.
|
|
|
|
|
.\"
|
|
|
|
|
.\" $FreeBSD$
|
|
|
|
|
.\"
|
|
|
|
|
.Dd July 7, 2001
|
|
|
|
|
.Dt NMDM 4
|
2001-07-11 08:59:10 +00:00
|
|
|
.Os
|
2001-07-08 04:35:21 +00:00
|
|
|
.Sh NAME
|
|
|
|
|
.Nm nmdm
|
|
|
|
|
.Nd nullmodem terminal driver
|
|
|
|
|
.Sh SYNOPSIS
|
|
|
|
|
.Cd "device nmdm"
|
|
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
The
|
|
|
|
|
.Nm
|
2005-01-27 09:29:52 +00:00
|
|
|
driver provides two
|
2001-07-08 04:35:21 +00:00
|
|
|
.Xr tty 4
|
2005-01-27 09:29:52 +00:00
|
|
|
devices connected
|
|
|
|
|
by a virtual "null modem" cable.
|
|
|
|
|
.Pp
|
|
|
|
|
If either of the two tty devices have the CDSR_OFLOW bit
|
|
|
|
|
("stty dsrflow")
|
|
|
|
|
set in their line discipline, the
|
2001-07-11 08:59:10 +00:00
|
|
|
.Nm
|
2005-01-27 09:29:52 +00:00
|
|
|
device will emulate the speed configured in the
|
|
|
|
|
.Xr termios 4
|
|
|
|
|
settings.
|
|
|
|
|
The speed emulation works independently in the two directions,
|
|
|
|
|
controlled by the slower ends termios settings (c_ispeed, c_ospeed,
|
|
|
|
|
CS5...CS8, CSTOPB and PARENB).
|
2001-07-08 04:35:21 +00:00
|
|
|
.Sh FILES
|
|
|
|
|
.Bl -tag -width /dev/nmdm[N][AB] -compact
|
2001-07-11 08:59:10 +00:00
|
|
|
.It Pa /dev/nmdm Ns Ar N Ns Op Pa AB
|
2001-07-08 04:35:21 +00:00
|
|
|
nullmodem device nodes.
|
2001-07-11 08:59:10 +00:00
|
|
|
Where the
|
|
|
|
|
.Pa A
|
|
|
|
|
node has a matching
|
|
|
|
|
.Pa B
|
|
|
|
|
node.
|
2001-07-08 04:35:21 +00:00
|
|
|
.El
|
2005-01-27 09:29:52 +00:00
|
|
|
.Pp
|
|
|
|
|
The
|
|
|
|
|
.Nm
|
|
|
|
|
driver implements "on-demand device creation" so simply accessing a
|
|
|
|
|
given instance in /dev will create it.
|
2001-07-08 04:35:21 +00:00
|
|
|
.Sh DIAGNOSTICS
|
|
|
|
|
None.
|
|
|
|
|
.Sh SEE ALSO
|
2005-01-27 09:29:52 +00:00
|
|
|
.Xr stty 1 ,
|
|
|
|
|
.Xr termios 4 ,
|
2001-07-08 04:35:21 +00:00
|
|
|
.Xr tty 4
|
|
|
|
|
.Sh HISTORY
|
|
|
|
|
The
|
|
|
|
|
.Nm
|
2001-08-11 00:59:40 +00:00
|
|
|
driver first appeared in
|
|
|
|
|
.Fx 4.4 .
|
