Something

# cat /etc/init.d/ntp-client
#!/sbin/runscript
# Copyright 1999-2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/net-misc/ntp/files/ntp-client.rc,v 1.8 2005/05/14 19:12:04 vapier Exp $

depend() {
        before cron portmap
        need net
        use dns logger
}

checkconfig() {
        if [ ! -x "`which ${NTPCLIENT_CMD} 2>/dev/null`" ] ; then
                eerror "Please edit /etc/conf.d/ntp-client"
                eerror "Unable to locate the client command ${NTPCLIENT_CMD}!"
                return 1
        fi
        if [ -z "${NTPCLIENT_OPTS}" ] ; then
                eerror "Please edit /etc/conf.d/ntp-client"
                eerror "I need to know what server/options to use!"
                return 1
        fi
        return 0
}

start() {
        checkconfig || return $?

        ebegin "Setting clock via the NTP client '${NTPCLIENT_CMD}'"
        ${NTPCLIENT_CMD} ${NTPCLIENT_OPTS} >/dev/null &
        local pid=$!
        (sleep ${NTPCLIENT_TIMEOUT:-30}; kill -9 ${pid} >&/dev/null) &
        wait ${pid}
        eend $? "Failed to set clock"
}