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  1. .SH
  2. 9P Protocol Drivers
  3. .PP
  4. The file server described so far
  5. waits for 9P protocol messages to
  6. appear in its input queue.
  7. It processes each message and
  8. sends the reply back to the originator.
  9. There are groups of processes that
  10. perform protocol I/O on some network or
  11. device and the resulting messages
  12. are sent to the file system queue.
  13. .PP
  14. There are two sets of processes
  15. .CW ethi
  16. and
  17. .CW etho
  18. that perform Ethernet input and output on two different networks.
  19. These processes send Ethernet messages
  20. to/from two more processes
  21. .CW ilo
  22. and
  23. .CW ilt
  24. that do the IL reliable datagram protocol
  25. on top of IP packets.
  26. .PP
  27. The last process in Emelie,
  28. .CW con ,
  29. reads the console
  30. and calls internal subroutines to
  31. executes commands typed.
  32. Since there is only one process,
  33. only one command can be executing at a
  34. time.
  35. See
  36. .I fs (8)
  37. for a description of the
  38. commands available at the console.