#!/bin/sh
#
# ----------------------------------------------------------------------
# /etc/init.d/ds200: start the syslog named pipe listener.
# ----------------------------------------------------------------------
# On Debian, install this with something like:
#
#     update-rc.d ds200 defaults 09 91
#
# This assumes that sysklogd installs itself with 10 90.
# ----------------------------------------------------------------------

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

pidfile=/var/run/ds200/pid
binpath=/your/path/ds200/parse_fifo

test -x $binpath || exit 0

create_fifo()
{
    if [ ! -e /var/run/ds200/fifo ]; then
	mknod /var/run/ds200/fifo p
    fi
}

running()
{
    if [ ! -f $pidfile ]; then
	return 1
    fi

    pid=`cat $pidfile`

    if [ -z "$pid" ]; then
	return 1
    fi

    # Check that there is such a process.
    if [ ! -d "/proc/$pid" ]; then
	return 1
    fi

    # Check that the first line is the perl interpreter:
    cmd=`cat /proc/$pid/cmdline | tr "\000" "\n" | head -1`
    if [ "$cmd" != "/usr/bin/perl" ]; then
	return 1
    fi

    # Check that the last line is the script we run:
    cmd=`cat /proc/$pid/cmdline | tr "\000" "\n" | tail -1`
    if [ "$cmd" != "$binpath" ]; then
	return 1
    fi

    return 0
}

case "$1" in
  start)
    echo -n "Starting DS200 listener... "
    if running; then
	echo "Already running."
    else
	create_fifo
	start-stop-daemon \
	    --start \
	    --quiet \
	    --background \
	    --make-pidfile \
	    --pidfile $pidfile \
	    --exec $binpath \
	    --name parse_fifo
	echo "Done."
    fi
    ;;
  stop)
    echo -n "Stopping DS200 listeners... "
    start-stop-daemon \
	--stop \
	--quiet \
	--pidfile $pidfile \
	--name parse_fifo
    echo "Done."
    ;;
  restart)
    echo -n "Stopping DS200 listeners... "
    start-stop-daemon \
	--stop \
	--quiet \
	--pidfile $pidfile \
	--name parse_fifo
    echo "Done."
    sleep 1
    echo -n "Starting DS200 listeners... "
    create_fifo
    start-stop-daemon \
	--start \
	--quiet \
	--background \
	--make-pidfile \
	--pidfile $pidfile \
	--exec $binpath \
	--name parse_fifo
    echo "Done."
    ;;
  reload|force-reload|reload-or-restart)
    start-stop-daemon \
	--stop \
	--quiet \
	--pidfile $pidfile \
	--name parse_fifo
    sleep 1
    create_fifo
    start-stop-daemon \
	--start \
	--quiet \
	--background \
	--make-pidfile \
	--pidfile $pidfile \
	--exec $binpath \
	--name parse_fifo
    ;;
  *)
    echo "Usage: /etc/init.d/ds200 {start|stop|reload|restart}"
    exit 1
esac

exit 0