Plan 9 - man page for consolefs (plan9 section 4)
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consolefs, C - file system for console access
aux/consolefs name dev [ name dev ... ]
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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