1NULLMODEM(1) User Manuals NULLMODEM(1)
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6 nullmodem - a Utility to loopback Pseudo-Terminals
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9 nullmodem [-F] [-V] [-q] [-r] [-m] tty...
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13 nullmodem creates a virtual network of Pseudo-Terminals. It can be
14 used as an adapter to connect two programs that normally need serial
15 interface cards.
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19 -F, --foreground
20 Unlike normal operation, nullmodem will not detach from the ter‐
21 minal when given this option. Some debugging informations will
22 be visible.
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25 -q, --quiet
26 Start quietly - for init scripts.
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29 -v, --verbose
30 Print debug info.
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33 -V, --version
34 Print the version number and exit.
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37 -r, --realtime
38 Start with realtime priority (i.e. use the round-robin sched‐
39 uler). This requires nullmodem to run with root privileges.
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42 -m, --memorylock
43 Lock the executable of nullmodem to RAM. This keeps nullmodem
44 from being swapped out.
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47 --setuid n
48 Set the UserID (UID) of the pseudo terminal spacial files to n.
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51 --setgid n
52 Set the GroupID (GID) of the pseudo terminal spacial files to n.
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55 --blocking
56 Use blocking IO to handle the interfaces (default: NONBLOCKing).
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60 Juergen Rinas <jrinas@gmx.de>
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63 kissnetd(8), openpty(3)
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67Linux JULY 2004 NULLMODEM(1)