AAN(8) AAN(8)
NAME
aan, aanuke - always available network
SYNOPSIS
aan -c [ -d ] [ -m maxto ] dialstring
aan [ -d ] [ -m maxto ] netdir
aanuke
DESCRIPTION
Aan tunnels traffic between a client and a server through a
persistent network connection. If the connection breaks
(voluntarily or due to networking problems), the aan client
re-establishes the connection by redialing the server.
Aan uses a unique protocol to make sure no data is ever lost
even when the connection breaks. After a reconnection, aan
retransmits all unacknowledged data between client and
server.
A connection can be broken voluntarily (e.g. by roaming over
IP networks), or a connection can break when the IP service
is unreliable. In either case, aan re-establishes the
client's connection automatically.
When the server part has not heard from the client in maxto
seconds, the server part of aan exits. The default maxto is
one day. The client side (option -c) calls the server by
its dialstring, while the server side listens for connec-
tions in the already-announced network directory netdir.
Aan is usually run automatically through the -p option of
import(4) and cpu(1).
Aanuke prints commands that will cause all processes called
aan that are owned by the current user and do not have an
active tcp connection to be terminated. Use the send com-
mand of rio(1), or pipe the output of kill into rc(1) to
execute the commands.
EXAMPLES
Assume the server part of aan is encapsulated in exportfs on
the machine sob and started through aux/listen as follows:
netdir=`{echo $3 | sed 's;/[0-9]+$;!*!0;'}
exec exportfs -a -A $netdir
Then machine astro6's name space can be imported through aan
using this command:
import -p astro6 / /mnt/term
Page 1 Plan 9 (printed 11/21/24)
AAN(8) AAN(8)
Kill idle instances of aan left behind by a terminal that
has been powered off:
aanuke | rc
FILES
/sys/log/aan Log file
SOURCE
/sys/src/cmd/aan.c
/rc/bin/aanuke
SEE ALSO
import(4), exportfs(4), cpu(1)
HISTORY
Aanuke first appeared in 9front (April, 2014).
Page 2 Plan 9 (printed 11/21/24)