anchor.diff:      %% But this (list:dir) is good enough...
       case os:type() of
           {unix, linux} ->
  +            ?IPRINT("init_per_testcase -> linux: check proc fs"),
               case file:read_file_info("/proc/" ++ os:getpid() ++ "/fd") of
                   {ok, #file_info{type   = directory,
                                   access = Access}}
  
positive.code:      check_sec_model2,
       check_sec_level,
       check_timer, 
       read, read_files
      ].
  
  groups() -> 
  
negative.code: %% -----
  %%
  
  init_per_testcase(fd_leak_check = _Case, Config) when is_list(Config) ->
      ?IPRINT("init_per_testcase -> entry with"
              "~n   Config: ~p", [Config]),
  
      %% There are other ways to test this:
      %% lsof (linux and maybe FreeBSD):    lsof -p <pid>
      %%    os:cmd("lsof -p " ++ os:getpid() ++ " | grep -v COMMAND | wc -l").
  