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# skip all of this if dhclient-script running by stop command defined below
if [ -z ${CONTROLLED_STOP} ] ; then
# stop dhclient for this interface, if it is not current one
# get PID for current dhclient
current_dhclient=`ps --no-headers --format ppid --pid $$ | awk '{ print $1 }'`
# get PID for master process (current can be a fork)
master_dhclient=`ps --no-headers --format ppid --pid $current_dhclient | awk '{ print $1 }'`
# get IP version for current dhclient
ipversion_arg=`ps --no-headers --format args --pid $current_dhclient | awk '{ print $2 }'`
# get list of all dhclient running for current interface
dhclients_pids=(`ps --no-headers --format pid,args -C dhclient | awk -v IFACE="/sbin/dhclient $ipversion_arg .*$interface$" '$0 ~ IFACE { print $1 }'`)
logmsg info "Current dhclient PID: $current_dhclient, Parent PID: $master_dhclient, IP version: $ipversion_arg, All dhclients for interface $interface: ${dhclients_pids[@]}"
# stop all dhclients for current interface, except current one
for dhclient in ${dhclients_pids[@]}; do
if ([ $dhclient -ne $current_dhclient ] && [ $dhclient -ne $master_dhclient ]); then
logmsg info "Stopping dhclient with PID: ${dhclient}"
# get path to PID-file of dhclient process
local dhclient_pidfile=`ps --no-headers --format args --pid $dhclient | awk 'match($0, ".*-pf (/.*pid) .*", PF) { print PF[1] }'`
# stop dhclient with native command - this will run dhclient-script with correct reason unlike simple kill
dhclient -e CONTROLLED_STOP=yes -x -pf $dhclient_pidfile
fi
done
fi
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