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.SH
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9P Protocol Drivers
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.PP
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The file server described so far
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waits for 9P protocol messages to
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appear in its input queue.
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It processes each message and
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sends the reply back to the originator.
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There are groups of processes that
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perform protocol I/O on some network or
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device and the resulting messages
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are sent to the file system queue.
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.PP
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There are two sets of processes
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.CW ethi
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and
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.CW etho
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that perform Ethernet input and output on two different networks.
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These processes send Ethernet messages
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to/from two more processes
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.CW ilo
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and
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.CW ilt
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that do the IL reliable datagram protocol
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on top of IP packets.
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.PP
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The last process in Emelie,
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.CW con ,
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reads the console
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and calls internal subroutines to
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executes commands typed.
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Since there is only one process,
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only one command can be executing at a
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time.
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See
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.I fs (8)
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for a description of the
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commands available at the console.