nullmodem (1) Linux Manual Page
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).