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nullmodem(1)

Linux
JULY 2004

nullmodem

A utility to loopback pseudo-terminals

NAME

nullmodem - a Utility to loopback Pseudo-Terminals

SYNOPSIS

nullmodem [-F] [-V] [-q] [-r] [-m] tty...

DESCRIPTION

nullmodem creates a virtual network of Pseudo-Terminals. It can be used as an adapter to connect two programs that normally need serial interface cards.

OPTIONS

-F, --foreground Unlike normal operation, nullmodem will not detach from the terminal when given this option. Some debugging informations will be visible.
-q, --quiet Start quietly - for init scripts.
-v, --verbose Print debug info.
-V, --version Print the version number and exit.
-r, --realtime Start with realtime priority (i.e. use the round-robin scheduler). This requires nullmodem to run with root privileges.
-m, --memorylock Lock the executable of nullmodem to RAM. This keeps nullmodem from being swapped out.
--setuid n Set the UserID (UID) of the pseudo terminal spacial files to n.
--setgid n Set the GroupID (GID) of the pseudo terminal spacial files to n.
--blocking Use blocking IO to handle the interfaces (default: NONBLOCKing).

AUTHOR

Juergen Rinas <>
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