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  This directory contains the modified code that permits us to pick up the
  network masks using the ioctl version of get_ifi_info (Chapter 17).

  Modifications have been introduced to the following files
  (w.r.t. ~cse533/Stevens/unpv13e):

  1. lib/get_ifi_info.c        here named      get_ifi_info_plus.c
  2. lib/unpifi.h              here named      unpifiplus.h
  3. ioctl/prifinfo.c          here named      prifinfo_plus.c


  Modifications in file get_ifi_info_plus.c:
  ------------------------------------------

  function  get_ifi_info   renamed  get_ifi_info_plus
                (plus, slight modification in the code)

  function  Get_ifi_info   renamed  Get_ifi_info_plus
                (but no modification in the code itself,
                 except for having it call get_ifi_info_plus
                 instead of get_ifi_info)

  function  free_ifi_info  renamed  free_ifi_info_plus
                (plus, slight modification in the code)


  Modifications in file unpifiplus.h:
  -----------------------------------

  extra field introduced in structure ifi_info for sockaddr structure
  that holds network mask


  Modifications in file prifinfo_plus.c:
  --------------------------------------

  function  prifinfo  renamed  prifinfo_plus  (plus slight
       modification in code so as to print out network mask)