#!/bin/sh
#
# Script to start/stop spanning tree called from kernel
# Make sure umask is sane
umask 022

# Set up a default search path.
PATH="/sbin:/usr/sbin:/bin:/usr/bin"
export PATH

if [ $# -ne 2 ]; then
   echo "Usage: bridge-stp <bridge> {start|stop}"
   exit 1
fi
bridge=$1
service=rstpd
pid_file=/var/run/${service}.pid

# Set $pid to pids from /var/run* for {program}.  $pid should be declared
# local in the caller.
# Returns LSB exit code for the 'status' action.
checkpid() {
	pid=
	if [ -f "$1" ] ; then
	        local line p
		read line < "$pid_file"
		for p in $line ; do
			[ -z "${p//[0-9]/}" -a -d "/proc/$p" ] && pid="$pid $p"
		done
	        if [ -n "$pid" ]; then
	                return 0
	        fi
		return 1 # "Program is dead and /var/run pid file exists"
	fi
	return 3 # "Program is not running"
}

daemon() {
    local pid
    checkpid $pid_file

    [ -n "$pid" ] && return
    # start it
    /sbin/rstpd
    RETVAL=$?
    [ $RETVAL -eq 0 ] && touch /var/lock/subsys/$service
}

start() {
    daemon
}

#when kernel start stp, we can't start the rstp again.
#otherwise it will cause deadlock issue
checkpid $pid_file || exit 1

case $2 in
     start) 
	exec /sbin/rstpctl rstp $bridge on
	;;
     stop)  
	exec /sbin/rstpctl rstp $bridge off
	;;
     *)
     	echo "Unknown action:" $2
	echo "Usage: bridge-stp <bridge> {start|stop}"
	exit 1
esac
