#! /bin/sh
# Copyright (c) 1995-2002 SuSE Linux AG, Nuernberg, Germany.
# All rights reserved.
#
# Author: Joachim Schrod <jschrod@acm.org>
#
# /etc/init.d/cpufreqd
#   and its symbolic link
# /(usr/)sbin/rccpufreqd
#
# system startup script for cpufreqd daemon,
# created from SuSE 8.1 example service/daemon script
#
# LSB compatible service control script; see http://www.linuxbase.org/spec/
# 
# Note: This template uses functions rc_XXX defined in /etc/rc.status on
# UnitedLinux (UL) based Linux distributions. If you want to base your 
# script on this template and ensure that it works on non UL based LSB 
# compliant Linux distributions, you either have to provide the rc.status
# functions from UL or change the script to work without them.
#
### BEGIN INIT INFO
# Provides:          cpufreqd
# Required-Start:
# Required-Stop:
# Default-Start:     2 3 5
# Default-Stop:
# Short-Description: cpufreqd daemon to adapt CPU speed
# Description:       Start cpufreqd daemon that adapts CPU speed,
#	configure with /etc/sysconfig/cpufreqd
### END INIT INFO
# 
# Note on script names:
# http://www.linuxbase.org/spec/refspecs/LSB_1.2.0/gLSB/scrptnames.html
# A registry has been set up to manage the init script namespace.
# http://www.lanana.org/
# Please use the names already registered or register one or use a
# vendor prefix.
#
# FIXME: cpufreqd should be allocated at LANANA.


# Check for existence of sysconfig file and read it.
# This sysconfig file should name kernel modules that must be
# loaded on the local system to provide the cpufreq interface.
# In addition, you can change location of binary and config file.
CPUFREQD_SYSCONFIG=/etc/sysconfig/cpufreqd
test -r $CPUFREQD_SYSCONFIG  &&  . $CPUFREQD_SYSCONFIG

# Check for missing binaries (stale symlinks should not happen)
: ${CPUFREQD_BIN:=/usr/local/sbin/cpufreqd}
test -x $CPUFREQD_BIN || exit 5

# Check for existence of needed config file
: ${CPUFREQD_CONFIG:=/usr/local/etc/cpufreqd.conf}
test -r $CPUFREQD_CONFIG || exit 6

# Assert existance of PIDFILE var:
: ${CPUFREQD_PIDFILE:=/var/run/cpufreqd.pid}

# Shell functions sourced from /etc/rc.status:
#      rc_check         check and set local and overall rc status
#      rc_status        check and set local and overall rc status
#      rc_status -v     ditto but be verbose in local rc status
#      rc_status -v -r  ditto and clear the local rc status
#      rc_status -s     display "skipped" and exit with status 3
#      rc_status -u     display "unused" and exit with status 3
#      rc_failed        set local and overall rc status to failed
#      rc_failed <num>  set local and overall rc status to <num>
#      rc_reset         clear local rc status (overall remains)
#      rc_exit          exit appropriate to overall rc status
#      rc_active	checks whether a service is activated by symlinks
#      rc_splash arg    sets the boot splash screen to arg (if active)
. /etc/rc.status

# Reset status of this service
rc_reset

# Return values acc. to LSB for all commands but status:
# 0	  - success
# 1       - generic or unspecified error
# 2       - invalid or excess argument(s)
# 3       - unimplemented feature (e.g. "reload")
# 4       - user had insufficient privileges
# 5       - program is not installed
# 6       - program is not configured
# 7       - program is not running
# 8--199  - reserved (8--99 LSB, 100--149 distrib, 150--199 appl)
# 
# Note that starting an already running service, stopping
# or restarting a not-running service as well as the restart
# with force-reload (in case signaling is not supported) are
# considered a success.

case "$1" in
    start)
	echo -n "Starting cpufreqd "

	# Load kernel module for cpufreqd if necessary.
	test "$CPUFREQD_MODULES"  &&  modprobe "$CPUFREQD_MODULES"

	## Start daemon with startproc(8). If this fails
	## the return value is set appropriately by startproc.
	if [ -f /proc/cpufreq ]
	   then	startproc $CPUFREQD_BIN
	   else	rc_failed
	fi

	# Remember status and be verbose
	rc_status -v
	;;
    stop)
	echo -n "Shutting down cpufreqd "

	## Stop daemon with killproc(8) and if this fails
	## killproc sets the return value according to LSB.
	killproc -TERM $CPUFREQD_BIN

	# Remove cpufreq module.
	test "$CPUFREQD_MODULES"  &&  modprobe -r "$CPUFREQD_MODULES"

	# Remember status and be verbose
	rc_status -v
	;;
    try-restart)
	## Do a restart only if the service was active before.
	## Note: try-restart is not (yet) part of LSB (as of 1.2)
	$0 status >/dev/null &&  $0 restart

	# Remember status and be quiet
	rc_status
	;;
    restart)
	## Stop the service and regardless of whether it was
	## running or not, start it again.
	$0 stop
	$0 start

	# Remember status and be quiet
	rc_status
	;;
    force-reload|reload)
	echo -n "Reload service cpufreqd "

	## Signal the daemon to reload its config.
	killproc -HUP $CPUFREQD_BIN

	rc_status -v
	;;
    status)
	echo -n "Checking for service cpufreqd "
	## Check status with checkproc(8), if process is running
	## checkproc will return with exit status 0.

	# Return value is slightly different for the status command:
	# 0 - service up and running
	# 1 - service dead, but /var/run/  pid  file exists
	# 2 - service dead, but /var/lock/ lock file exists
	# 3 - service not running (unused)
	# 4 - service status unknown :-(
	# 5--199 reserved (5--99 LSB, 100--149 distro, 150--199 appl.)
	
	# NOTE: checkproc returns LSB compliant status values.
	checkproc $CPUFREQD_BIN
	# NOTE: rc_status knows that we called this init script with
	# "status" option and adapts its messages accordingly.
	rc_status -v
	;;
    probe)
	## Optional: Probe for the necessity of a reload, print out the
	## argument to this init script which is required for a reload.
	## Note: probe is not (yet) part of LSB (as of 1.2)

	test "$CPUFREQD_CONFIG" -nt "$CPUFREQD_PIDFILE" && echo reload
	;;
    *)
	echo "Usage: $0 {start|stop|status|try-restart|restart|force-reload|reload|probe}"
	exit 1
	;;
esac
rc_exit
