nmdm man page on DragonFly

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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
     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.

BSD				 July 7, 2001				   BSD
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