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NMDM(4)			 BSD 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 de-
     vice 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.

BSD				 July 7, 2001				   BSD

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

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