#!/bin/bash
#
# Starts the OSS sound driver
#
### BEGIN INIT INFO
# Provides:          oss4-base
# Required-Start:    $remote_fs $local_fs
# Required-Stop:     $remote_fs $local_fs
# Default-Start:     S
# Default-Stop:      0 1 6
# Short-Description: Start and Stop the OSS4 subsystem
### END INIT INFO

OSSETCDIR=/etc/oss4
OSSVARDIR=/var/lib/oss4

. /etc/oss.conf
. /lib/lsb/init-functions

# Exit if oss4 is not installed
test -x /usr/sbin/ossdetect || exit 0

echo_procs_using_sound()
{
	echo $( fuser /dev/mixer* /dev/dsp* /dev/midi* /dev/oss/*/* 2>/dev/null )
}

kill_procs_using_sound()
{
	procs_using_sound="$(echo_procs_using_sound)"

	if [ "$procs_using_sound" ] ; then
		echo -n "Terminating processes:"
		for attempt in 1 2 3 4 ; do
			echo -n " ${procs_using_sound}"
			kill $procs_using_sound || :
			sleep 1
			procs_using_sound="$(echo_procs_using_sound)"
			[ "$procs_using_sound" ] || break
		done
		# Either no more procs using sound or attempts ran out
		if [ "$procs_using_sound" ] ; then
			echo -n " (with SIGKILL:) ${procs_using_sound}"
			kill -9 $procs_using_sound || :
			sleep 1
		fi
		procs_using_sound="$(echo_procs_using_sound)"
		if [ "$procs_using_sound" ] ; then
			echo " (failed: processes still using sound devices: $(echo_with_command_names $procs_using_sound))."
			return 1
		fi
		echo "."
	fi
	return 0
}

unload_modules()
{
	procs_using_sound="$(echo_procs_using_sound)"

	if test "$procs_using_sound " != " "
	then
	  log_action_end_msg 2 'Some applications are still using OSS'
	  exit 2
	fi

	# Unload oss drivers
	for n in `cat $OSSETCDIR/installed_drivers | sed 's/#.*//'`
	do
		if ! /sbin/rmmod $n
		then
			log_warning_msg "Unloading module $n failed - ignored"
		fi
	done

	if ! /sbin/rmmod osscore
	then
		log_action_end_msg 3 'Cannot unload the OSS driver modules'
		exit 3
	fi
}

case "$1" in
  start)
	log_begin_msg 'Starting Open Sound System: '

	# Check if OSS is already running
	if test -f /proc/opensound/devfiles
	then
		log_action_end_msg 0 'OSS is already loaded'
		exit 0
	fi

	# Check if oss kernel modules are installed
	if ! test -f /lib/modules/`uname -r`/kernel/oss4/osscore.ko && ! test -f /lib/modules/`uname -r`/updates/dkms/osscore.ko
	then
		log_action_end_msg 1 'No kernel modules detected'
		exit 0
	fi

	# Detect hardware
	if ! test -f $OSSETCDIR/installed_drivers
	then
		/usr/sbin/ossdetect -v
	fi
	if ! test -f $OSSETCDIR/installed_drivers
	then
		log_action_end_msg 10 "No $OSSETCDIR/installed_drivers - cannot continue (problem with ossdetect?)"
		exit 10
	fi

	# Load osscore
	OPTIONS=
	if test -f $OSSETCDIR/conf/osscore.conf
	then
	  OPTIONS="`grep -v -h '^#' $OSSETCDIR/conf/osscore.conf|sed 's/ //g'`"
	fi
	if ! /sbin/modprobe osscore $OPTIONS
	then
		log_action_end_msg 60 "Cannot load the osscore module"
		exit 60
	fi

	# Load oss drivers
	for n in `cat $OSSETCDIR/installed_drivers | sed 's/#.*//'`
	do
		OPTIONS=

		if test -f $OSSETCDIR/conf/$n.conf
		then
		  OPTIONS="`grep -v -h '^#' $OSSETCDIR/conf/$n.conf|sed 's/ //g'`"
		fi

		if ! /sbin/modprobe $n $OPTIONS
		then
			log_warning_msg "Loading module $n failed - ignored"
		fi
	done

	# Check if everything is OK
	if ! test -f /proc/opensound/devfiles
	then
		log_action_end_msg 70 'OSS Core module refused to start'
		exit 70
	fi

	# Create device file
	/usr/sbin/ossdetect -d -m 660 -g audio

	# Create basic links
	/usr/sbin/ossdevlinks
	if test -f $OSSVARDIR/legacy_devices
	then
		sh $OSSVARDIR/legacy_devices
	fi

	/usr/sbin/savemixer -L

	log_action_end_msg 0
	;;

  stop)
	log_begin_msg 'Stopping Open Sound System: '
	if ! test -f /proc/opensound/devfiles
	then
		log_action_end_msg 0 'OSS not loaded'
		exit 0
	fi

	/usr/sbin/savemixer

	log_action_end_msg 0
	;;

  unload)
	log_begin_msg 'Unloading Open Sound System kernel modules: '

	if ! test -f /proc/opensound/devfiles
	then
		log_action_end_msg 0 'OSS not loaded'
		exit 0
	fi

	/usr/sbin/savemixer
	unload_modules
	log_action_end_msg 0
	;;

  force-unload)
	log_begin_msg 'Unloading Open Sound System kernel modules: '

	if ! test -f /proc/opensound/devfiles
	then
		log_action_end_msg 0 'OSS not loaded'
		exit 0
	fi

	/usr/sbin/savemixer
	kill_procs_using_sound
	unload_modules
	log_action_end_msg 0
	;;

  restart)
	$0 stop
	sleep 1
	$0 start
	;;

  force-reload)
	$0 force-unload
	sleep 1
	$0 start
	;;

  *)
	echo "Usage: $0 {start|stop|unload|force-unload|restart|force-reload}"
	exit 3
esac