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devn-fd.so

File descriptor interface driver

Syntax:

io-net -d fd fd=device[,option[,option ...]] ... &

Options:

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Use commas (,) to separate the options (not spaces).

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ahdlc

Read or write packet data in AHDLC frame format.

fd=device

The device on which to open the file descriptor to read or write packet data. You must specify this option.

mac=XXXXXXXXXXXX

The MAC address of the controller. There is no default.

mru=num

Maximum receive unit. The default is 1514.

mtu=num

Maximum transmission unit. The default (1514) is automatically detected on supported hardware.

nomulticast

Disable multicast support.

priority=N

Priority of the driver event-thread. The default is 21.

promiscuous

Enable promiscuous mode. The default is off.

verbose
verbose=num

Be verbose. Specify num for more verbosity (num can be 1-4, the higher the number, the more detailed the output). The default is 0. The output goes to slogger, invoke sloginfo to view.

Description:

The devn-fd.so driver uses file-descriptor based I/O (i.e. open(), read(), write(), and so on) to receive and transmit packets. It provides the Network Manager (io-net) with reliable data transfer over any media supported by a file-descriptor-based server process.

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The devn-fd.so driver does not support multicast addresses.

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For example, you could use devn-fd.so to connect two machines with a null-modem RS-232 serial cable. By using file-descriptor I/O to the serial devices, devn-fd.so would implicitly use a serial driver and set up a logical network link.

Examples:

Start io-net using the FD driver and the full TCP/IP stack:

io-net -d fd fd=/dev/ser1,mac=0023456789AB,ahdlc -p tcpip
ifconfig en0 10.0.184

Files:

/dev/io-net

The directory where, by default, drivers and protocol modules add entries. For more information, the documentation for io-net.

Caveats:

You must specify the fd option when using this driver.

See also:

io-net

"Network drivers (devn-*)" and "Network protocol interfaces (npm-*)" in the Utilities Summary

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