text: #!/usr/bin/python
  #/*
  # * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
  # * contributor license agreements.  See the NOTICE file distributed with
  # * this work for additional information regarding copyright ownership.
  # * The OpenAirInterface Software Alliance licenses this file to You under
  # * the OAI Public License, Version 1.0  (the "License"); you may not use this file
  # * except in compliance with the License.
  # * You may obtain a copy of the License at
  # *
  # *      http://www.openairinterface.org/?page_id=698
  # *
  # * Unless required by applicable law or agreed to in writing, software
  # * distributed under the License is distributed on an "AS IS" BASIS,
  # * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # * See the License for the specific language governing permissions and
  # * limitations under the License.
  # *-------------------------------------------------------------------------------
  # * For more information about the OpenAirInterface (OAI) Software Alliance:
  # *      contact@openairinterface.org
  # */
  
  # \author Navid Nikaein, Rohit Gupta
  
  import os
  from pyroute2 import IPRoute
  import sys
  import re
  import threading
  import signal
  import traceback
  import commands
  
  def read_file(filename):
    try:
      file = open(filename, 'r')
      return file.read()
    except Exception, e:
      # WE just ignore the exception as some files are probably not present
      #error = ' Filename ' + filename 
      #error = error + ' In function: ' + sys._getframe().f_code.co_name + ': *** Caught exception: '  + str(e.__class__) + " : " + str( e)
      #error = error + traceback.format_exc()
      #print error
      return ''
  
  def find_usb_path(idVendor, idProduct):
    for root, dirs, files in os.walk("/sys/bus/usb/devices", topdown=False):
      for name in dirs:
          tmpdir= os.path.join(root, name)
          tmpidVendor = read_file(tmpdir+'/idVendor').replace("\n","")
          tmpidProduct = read_file(tmpdir+'/idProduct').replace("\n","")
          if tmpidVendor == idVendor and tmpidProduct == idProduct:
              return tmpdir
    return ''
  
  