#! /bin/sh
# /etc/init.d/klogd: start the kernel log daemon.

PATH=/bin:/usr/bin:/sbin:/usr/sbin

pidfile=/var/run/klogd/klogd.pid
kmsgpipe=/var/run/klogd/kmsg
kmsgpidfile=/var/run/klogd/kmsgpipe.pid
binpath=/sbin/klogd

test -f $binpath || exit 0
. /lib/lsb/init-functions

#  Use KLOGD="-k /boot/System.map-$(uname -r)" to specify System.map
#
KLOGD="-P $kmsgpipe"

test ! -r /etc/default/klogd || . /etc/default/klogd

running()
{
    # No pidfile, probably no daemon present
    #
    if [ ! -f $pidfile ]
    then
	return 1
    fi

    pid=`cat $pidfile`

    # No pid, probably no daemon present
    #
    if [ -z "$pid" ]
    then
	return 1
    fi

    if [ ! -d /proc/$pid ]
    then
	return 1
    fi

    cmd=`cat /proc/$pid/cmdline | tr "\000" "\n"|head -n 1`

    # No syslogd?
    #
    if [ "$cmd" != "$binpath" ]
    then
	return 1
    fi

    return 0
}

case "$1" in
  start)
    log_begin_msg "Starting kernel log..."

    # create klog-writeable pid and fifo directory
    mkdir -p /var/run/klogd
    chown klog:klog /var/run/klogd
    mkfifo -m 700 $kmsgpipe
    chown klog:klog $kmsgpipe

    # shovel /proc/kmsg to pipe readable by klogd user
    start-stop-daemon --start --pidfile $kmsgpidfile --exec /bin/dd -b -m -- bs=1 if=/proc/kmsg of=$kmsgpipe

    # start klogd as non-root with reading from kmsgpipe
    start-stop-daemon --start --quiet --chuid klog --exec $binpath -- $KLOGD
    log_end_msg $?
    ;;
  stop)
    log_begin_msg "Stopping kernel log..."
    start-stop-daemon --stop --retry TERM/1/TERM/1/TERM/4/KILL --quiet --oknodo --exec $binpath --pidfile $pidfile

    # stop kmsgpipe
    start-stop-daemon --stop --quiet --oknodo --pidfile $kmsgpidfile
    rm -f $kmsgpidfile $kmsgpipe

    log_end_msg $?
    ;;
  restart|force-reload)
    $0 stop
    sleep 1
    $0 start
    ;;
  *)
    log_success_msg "Usage: /etc/init.d/klogd {start|stop|restart|force-reload}"
    exit 1
esac

exit 0
