openvswitch/debian/openvswitch-monitor.init

#!/bin/sh 
#
# Example init.d script with LSB support.
#
# Please read this init.d carefully and modify the sections to
# adjust it to the program you want to run.
#
# Copyright (c) 2007, 2009 Javier Fernandez-Sanguino <jfs@debian.org>
#
# This is free software; you may redistribute it and/or modify
# it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2,
# or (at your option) any later version.
#
# This is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License with
# the Debian operating system, in /usr/share/common-licenses/GPL;  if
# not, write to the Free Software Foundation, Inc., 59 Temple Place,
# Suite 330, Boston, MA 02111-1307 USA
#
### BEGIN INIT INFO
# Provides:          openvswitch-monitor
# Required-Start:    $network $local_fs
# Required-Stop:     
# Should-Start:      $named $syslog openvswitch-switch
# Should-Stop:       
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Open vSwitch switch monitor
### END INIT INFO

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

DAEMON=/usr/sbin/ovs-monitor
NAME=openvswitch-monitor
DESC="Open vSwitch switch monitor"

PIDFILE=/var/run/$NAME.pid 

test -x $DAEMON || exit 0

. /lib/lsb/init-functions

# Default options, these can be overriden by the information
# at /etc/default/$NAME
DAEMON_OPTS=""          # Additional options given to the daemon 

DODTIME=10              # Time to wait for the daemon to die, in seconds
                        # If this value is set too low you might not
                        # let some daemons to die gracefully and
                        # 'restart' will not work
                        
# Include defaults if available
if [ -f /etc/default/$NAME ] ; then
	. /etc/default/$NAME
fi

set -e

running_pid() {
# Check if a given process pid's cmdline matches a given name
    pid=$1
    name=$2
    [ -z "$pid" ] && return 1 
    [ ! -d /proc/$pid ] &&  return 1
    return 0
}

running() {
# Check if the process is running looking at /proc
# (works for all users)

    # No pidfile, probably no daemon present
    [ ! -f "$PIDFILE" ] && return 1
    pid=`cat $PIDFILE`
    running_pid $pid $DAEMON || return 1
    return 0
}

start_daemon() {
# Start the process using the wrapper
    if test $THRESHOLD != 0; then
        start-stop-daemon --start --quiet -m --background --pidfile $PIDFILE \
            --exec $DAEMON -- -c $THRESHOLD -i $INTERVAL -l $LOG_FILE \
            -s $SWITCH_VCONN $DAEMON_OPTS 
    fi

    # Wait up to 3 seconds for the daemon to start.
    for i in 1 2 3; do
        if running; then
            break
        fi
        sleep 1
    done
}

stop_daemon() {
    start-stop-daemon -o --stop --pidfile $PIDFILE
    rm $PIDFILE
}

case "$1" in
  start)
	log_daemon_msg "Starting $DESC " "$NAME"
        # Check if it's running first
        if running ;  then
            log_progress_msg "apparently already running"
            log_end_msg 0
            exit 0
        fi
        if start_daemon && running ;  then
            # It's ok, the daemon started and is running
            log_end_msg 0
        else
            # Either we could not start it or it is not running
            # after we did
            # NOTE: Some daemons might die some time after they start,
            # this code does not try to detect this and might give
            # a false positive (use 'status' for that)
            log_end_msg 1
        fi
	;;
  stop)
        log_daemon_msg "Stopping $DESC" "$NAME"
        if running ; then
            # Only stop the daemon if we see it running
            stop_daemon
            log_end_msg $?
        else
            # If it's not running don't do anything
            log_progress_msg "apparently not running"
            log_end_msg 0
            exit 0
        fi
        ;;
  restart|force-reload)
        log_daemon_msg "Restarting $DESC" "$NAME"
        if running ;  then
            stop_daemon
            # Wait some sensible amount, some daemons need this
            [ -n "$DIETIME" ] && sleep $DIETIME
        fi
        start_daemon
        running
        log_end_msg $?
	;;
  status)
        log_daemon_msg "Checking status of $DESC" "$NAME"
        if running ;  then
            log_progress_msg "running"
            log_end_msg 0
        else
            log_progress_msg "apparently not running"
            log_end_msg 1
            exit 1
        fi
        ;;
  # Use this if the daemon cannot reload
  reload)
        log_warning_msg "Reloading $NAME daemon: not implemented, as the daemon"
        log_warning_msg "cannot re-read the config file (use restart)."
        ;;
  *)
	N=/etc/init.d/$NAME
	echo "Usage: $N {start|stop|restart|force-reload|status}" >&2
	exit 1
	;;
esac

exit 0