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NMDM(4)		       FreeBSD Kernel Interfaces Manual		       NMDM(4)

NAME
     nmdm -- nullmodem terminal	driver

SYNOPSIS
     device nmdm

DESCRIPTION
     The nmdm driver provides support for a device-pair	termed a null modem
     pair.  A null modem pair is a pair	of character devices.  Each device
     provides to a process an interface	identical to that described in tty(4).
     However, whereas most other devices which provide the interface described
     in	tty(4) have a hardware device of some sort behind them,	the nmdm
     device has, instead, another process manipulating it through the other
     half of the pair.	That is, anything written on the first device is given
     to	the second device as input and anything	written	on the second device
     is	presented as input on the first	device.

FILES
     /dev/nmdmN[AB]    nullmodem device	nodes.	Where the A node has a match-
		       ing B node.

DIAGNOSTICS
     None.

SEE ALSO
     tty(4)

HISTORY
     The nmdm driver first appeared in FreeBSD 4.4.

FreeBSD	10.1			 July 7, 2001			  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | FILES | DIAGNOSTICS | SEE ALSO | HISTORY

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