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Plan 9 - man page for consolefs (plan9 section 4)

CONSOLEFS(4)			     Kernel Interfaces Manual			     CONSOLEFS(4)

       consolefs, C  - file system for console access

       aux/consolefs name dev [ name dev ...  ]

       C system

       To  ease administration of multiple machines one might attach many serial console lines to
       a single computer.  Consolefs is a file system that  lets  multiple  users  simultaneously
       access  these  console lines.  Each name/dev pair represents the name of a console and the
       serial line device associated with it.  Consolefs presents a single level  directory  with
       two  files  per console: name and namectl.  Writes of name are equivalent to writes of dev
       and reads and writes of namectl are equivalent to reads and writes of  devctl.	Consolefs
       broadcasts  anything  it reads from dev to all readers of name.	Therefore, many users can
       con(1) to a name, see all console output, and enter commands to the console.

       To keep users from inadvertently interfering with one another, notification  is	broadcast
       to  all	readers whenever a user opens or closes name.  For example, if user boris opens a
       console that users vlad and barney have already opened, all will read the message:

	    [+boris, vlad, barney]

       If vlad then closes, boris and barney will read:

	    [-vlad, boris, barney]

       Consolefs posts the client end of its 9P channel in /srv/consolefs;  mount  (see  bind(1))
       this file to see the consoles.  An example of 2 consoles complete with console logging is:

	      % aux/consolefs bootes /dev/eia0 fornax /dev/eia1
	      % mount /srv/consoles /mnt/consoles
	      % ls -p /mnt/consoles
	      % cat /mnt/consoles/fornax >> /sys/log/fornax &
	      % cat /mnt/consoles/bootes >> /sys/log/bootes &

       The  rc(1)  script  C automates this procedure.	It uses import(4) to connect to /mnt/con-
       soles on the machine connected to all the consoles, then uses con(1)  to  connect  to  the
       console	of  the  machine  system.  The script must be edited at installation by the local
       administration to identify the system that holds /mnt/consoles.

	      Client end of pipe to server.



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