lfs-book-zh_CN/bootscripts/lfs/init.d/rc

#!/bin/sh
########################################################################
# Begin $rc_base/init.d/rc
#
# Description : Main Run Level Control Script
#
# Authors     : Gerard Beekmans  - gerard@linuxfromscratch.org
#
# Version     : 00.00
#
# Notes       :
#
########################################################################

. /etc/sysconfig/rc
. ${rc_functions}

# This sets a few default terminal options.
stty sane

# These 3 signals will not cause our script to exit
trap "" INT QUIT TSTP

[ "${1}" != "" ] && runlevel=${1}

if [ "${runlevel}" = "" ]; then
	echo "Usage: ${0} <runlevel>" >&2
	exit 1
fi

previous=${PREVLEVEL}
[ "${previous}" = "" ] && previous=N

if [ ! -d ${rc_base}/rc${runlevel}.d ]; then
	boot_mesg "${rc_base}/rc${runlevel}.d does not exist." ${WARNING}
	boot_mesg_flush
	exit 1
fi

# Attempt to stop all service started by previous runlevel,
# and killed in this runlevel
if [ "${previous}" != "N" ]; then
	for i in $(ls -v ${rc_base}/rc${runlevel}.d/K* 2> /dev/null)
	do
		check_script_status

		suffix=${i#$rc_base/rc$runlevel.d/K[0-9][0-9]}
		prev_start=$rc_base/rc$previous.d/S[0-9][0-9]$suffix
		sysinit_start=$rc_base/rcsysinit.d/S[0-9][0-9]$suffix

		if [ "${runlevel}" != "0" ] && [ "${runlevel}" != "6" ]; then
			if [ ! -f ${prev_start} ] && [ ! -f ${sysinit_start} ]; then
				boot_mesg -n "WARNING:\n\n${i} can't be" ${WARNING}
				boot_mesg -n " executed because it was not"
				boot_mesg -n " not started in the previous"
				boot_mesg -n " runlevel (${previous})."
				boot_mesg "" ${NORMAL}
				boot_mesg_flush
				continue
			fi
		fi
		${i} stop
		error_value=${?}

		if [ "${error_value}" != "0" ]; then
			print_error_msg
		fi
	done
fi

#Start all functions in this runlevel
for i in $( ls -v ${rc_base}/rc${runlevel}.d/S* 2> /dev/null)
do
	if [ "${previous}" != "N" ]; then
		suffix=${i#$rc_base/rc$runlevel.d/S[0-9][0-9]}
		stop=$rc_base/rc$runlevel.d/K[0-9][0-9]$suffix
		prev_start=$rc_base/rc$previous.d/S[0-9][0-9]$suffix

		[ -f ${prev_start} ] && [ ! -f ${stop} ] && continue
	fi

	check_script_status

	case ${runlevel} in
		0|6)
			${i} stop
			;;
		*)
			${i} start
			;;
	esac
	error_value=${?}

	if [ "${error_value}" != "0" ]; then
		print_error_msg
	fi
done

# End $rc_base/init.d/rc