CEC(8) CEC(8)
NAME
cec - Coraid Ethernet Console
SYNOPSIS
cec [ -dp ] [ -S srv ] [ -c esc ] [ -e ea ] [ -h host [ -s
shelf ] [ interface ]
DESCRIPTION
The cec command uses raw ethernet frames to connect to a CEC
server to simulate a serial connection. The client and pro-
tocol provide for packet acknowledgement and retransmission.
Coraid appliances and Coraid Plan 9 kernels can currently be
CEC servers. Each uses CEC to provide console access.
A cec process starts by probing the specified network inter-
face for available CEC servers. The default is /net/ether0
. Only one cec process may be run per ethernet interface.
The -S flag posts its argument to /srv to allow sharing. If
the server is specified with the -b, -h, or -s flag, the
connection will proceed immediately upon discovery of the
first CEC server with the specified address. Otherwise, a
selection prompt will be displayed showing the discovered
CEC servers available for communication. Unless the -p flag
is specified, cec exits if no matching servers are found.
0 5 003048865f1e shelf5
[#qp]:
The selection prompt accepts
n Connect to server n (from the first column),
p Probe the interface again, and
q Quit.
Note the selection number is not the shelf address but the
cec-generated sequence number printed in the leftmost col-
umn.
Once connected to a cec server, entering the escape sequence
will drop the user into an escape prompt where the user may
type 'q' to quit the connection, 'i' to send the escape
sequence across the connection, or '.' to continue the con-
nection. The escape sequence is printed on connection. If
the connection is unexpectedly lost, the initial probe pro-
cess outlined above is rerun.
Options
-c esc Set the escape caracter to ctl- esc. The default
Page 1 Plan 9 (printed 12/22/24)
CEC(8) CEC(8)
setting is ctl-\.
-d Output debugging information.
-e ea Connect to the server with ethernet address
ea.Thisoptionimplies -p.
-h host Connect to the server named host. Note this name
may not be the same as the value of
`/dev/sysname'.
-p Persistence. Continue trying to connect even if
there are no matching servers. This is useful
when connecting to a cpu server before it boots.
-s shelf Connect to the server at shelf address shelf.
SEE ALSO
cec(3).
BUGS
The CEC protocol should be integrated with the console
server.
CEC should multiplex network connections as /net/tcp does.
Early boot information and very late crash information from
servers may be lost due to timing quirks.
Page 2 Plan 9 (printed 12/22/24)