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NMDM (4) | Special files and drivers | Unix Manual Pages | :man

NAME

nmdm - nullmodem terminal driver

CONTENTS

Synopsis
Description
Files
Diagnostics
See Also
History

SYNOPSIS


.Cd "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 (""sttydsrflow"") set in their line discipline, the nmdm device will emulate the speed configured in the termios(4) settings. The speed emulation works independently in the two directions, controlled by the slower end’s termios settings ( c_ispeed, c_ospeed, CS5 ... CS8, CSTOPB and PARENB).

FILES

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

The nmdm driver implements ""on-demand device creation"" so simply accessing a given instance in /dev will create it.

DIAGNOSTICS

None.

SEE ALSO

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

HISTORY


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