CEC(3) CEC(3)
NAME
cec - coraid ethernet console server
SYNOPSIS
bind #© /dev
/dev/ceccfg
/dev/cecctl
/dev/cecdbg
/dev/cecstat
DESCRIPTION
Cec exports a machines console over raw ethernet frames.
See cec(8) for a client.
The read-only file ceccfg lists the interfaces on which cec
is configured, one per line.
The write-only cecctl accepts control messages. The command
cecon ethern
turns on a cec listener for ethern, while
cecoff ethern
turns that listener off. The command
namestring
sets the name of the current machine name to string while
shelf n
sets the shelf number in Toffer messages. The default name
is the empty string and the default shelf number is -1.
These parameters are listed in the available servers pre-
sented by cec(8). The command
password string
sets the connection password. The cec protocol transmits
passwords in the clear. This is not real security. The
strings traceon and traceoff control cec tracing.
Debugging output is available in the read-only file cecdbg.
The file cecstat lists each connection in the following for-
mat
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CEC(3) CEC(3)
000e0c06a37c 25 open 0 0 0 00000000
The 7 fields are ethernet mac address, the connection num-
ber, the connection state ( unused, initb, login, open), the
number of idle ticks, the number of retires and the address
of the current outstanding message's Block*. Fields 4-7 are
likely to change in the future.
EXAMPLE
Start cec on ports with no ip stack.
bind -a '#©' /dev
for(i in `{seq 1 10}){
if(test -e '#l'^$i)
if(! test -e /net*/ether^$i)
echo 'cecon #l'^$i>/dev/cecctl
}
SEE ALSO
cec(8),
SOURCE
/sys/src/9/port/devcec.c
BUGS
Cec is not available before ethernet has started or from
9load.
The cecstat format is neither fixed-width nor are fields 4-7
very useful.
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