freebsd-skq/etc/rc.d/dhclient
brooks 9855940fef When the state of the interface changes rapidly enough (usually due to
rapid wireless association changes in my experience), there is a race
where dhclient is in the process of exiting due to the link going down
when the link coming up causes devd to try and start a new one.  This
results is the link being up, but no dhclient running.

Work around this race by checking a second time after a one second delay
before refusing to start a dhclient instance due to one already being
running.

MFC after:	1 week
2008-02-01 23:43:58 +00:00

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#!/bin/sh
#
# $FreeBSD$
#
# PROVIDE: dhclient
# KEYWORD: nojail nostart
. /etc/rc.subr
. /etc/network.subr
name="dhclient"
rcvar=
start_cmd="dhclient_start"
stop_cmd="dhclient_stop"
dhclient_start()
{
# prevent unnecessary restarts
# XXX: dhclient had better create a pidfile
if [ -x /bin/pgrep ]; then
pids=`/bin/pgrep -f "dhclient: $ifn(\$| .*)"`
if [ -n "$pids" ]; then
sleep 1
pids=`/bin/pgrep -f "dhclient: $ifn(\$| .*)"`
if [ -n "$pids" ]; then
exit 0
fi
fi
fi
# Override for $ifn specific flags (see rc.subr for $flags setting)
specific=`get_if_var $ifn dhclient_flags_IF`
if [ -z "$flags" -a -n "$specific" ]; then
rc_flags=$specific
fi
background_dhclient=`get_if_var $ifn background_dhclient_IF $background_dhclient`
if checkyesno background_dhclient; then
rc_flags="${rc_flags} -b"
fi
${dhclient_program} ${rc_flags} $ifn
}
dhclient_stop()
{
ifconfig $ifn down # cause dhclient to die
}
ifn="$2"
load_rc_config $name
load_rc_config network
if ! dhcpif $ifn; then
return 1
fi
run_rc_command "$1"