nmdm man page on GhostBSD

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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 two tty(4) devices connected by a virtual “null
     modem” cable.

     If either of the two tty devices have the CDSR_OFLOW bit (“stty dsrflow”)
     set in their line discipline, the nmdm device will emulate the speed con‐
     figured in the termios(4) settings.  The speed emulation works indepen‐
     dently in the two directions, controlled by the slower end's termios set‐
     tings (c_ispeed, c_ospeed, CS5 ... CS8, CSTOPB and PARENB).

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

     The nmdm driver implements “on-demand device creation” so simply access‐
     ing a given instance in /dev will create it.

DIAGNOSTICS
     None.

SEE ALSO
     stty(1), termios(4), tty(4)

HISTORY
     The nmdm driver first appeared in FreeBSD 4.4.

BSD			       January 27, 2005				   BSD
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