apt-get install daemonlogger
mkdir /tmp/foo

cat > /etc/init/daemonlogger.conf <<EOF
respawn
expect daemon

script
  daemonlogger -d -i eth0 -n eth0 -l /tmp/foo
end script
EOF

# status daemonlogger
daemonlogger stop/waiting
# start daemonlogger
daemonlogger start/running, process 1330
# ps aux |grep 1330
root      1334  0.0  0.1   9376   880 pts/0    S+   15:02   0:00 grep 1330
# ps aux |grep daemonlogger
root      1241  0.0  0.1   9376   884 pts/0    S+   15:08   0:00 grep daemonlogger
# status daemonlogger
daemonlogger start/running, process 1330
# stop daemonlogger
[ ... hangs forever ... ]
^C
# status daemonlogger
daemonlogger stop/killed, process 1330
# start daemonlogger
[ ... hangs forever ... ]
^C
# status daemonlogger
daemonlogger start/killed, process 1330

[ doesn't actually attempt to start the process ]

# reboot
[...]
The system is going down for reboot NOW!
acpid: exiting
 * Asking all remaining processes to terminate...
[ ... hangs forever ... ]