anchor.diff:  
   %%======================================================================
   
  +%% Since we need something to read, we also write.
  +%% And we can just as well that too...
   read(suite) -> [];
   read(Config) when is_list(Config) ->
  -    ?P(read),
  -    ?SKIP(not_implemented_yet).
  +    ?TC_TRY(read,
  +            fun() -> ok end,
  +            fun(_) -> do_read(Config) end,
  +            fun(_) -> ok end).
  +
  +do_read(Config) ->
  +    Dir       = ?config(priv_subdir, Config),
  +    NumOpenFD = ?config(num_open_fd, Config),
  +
  +    Entries = [
  +               snmpa_conf:agent_entry(intAgentIpAddress, {0,0,0,0}),
  +               snmpa_conf:agent_entry(intAgentUDPPort, 161),
  +               snmpa_conf:agent_entry(snmpEngineMaxMessageSize, 484),
  +               snmpa_conf:agent_entry(snmpEngineID, "fooBarEI")
  +              ],
  +
  +    NumFD01 = NumOpenFD(),
  +
  +    ok = snmpa_conf:write_agent_config(Dir, Entries),
  +
  +    NumFD02 = NumOpenFD(),
  +
  +    {ok, _} = snmpa_conf:read_agent_config(Dir),
  +
  +
  +    NumFD03 = NumOpenFD(),
  +    if
  +        (NumFD01 =:= NumFD02) andalso (NumFD02 =:= NumFD03) ->
  +            ok;
  +        true ->
  +            ?FAIL({num_open_fd, NumFD01, NumFD02, NumFD03})
  +    end.
  +
  +
  +
  +%% 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").
  +%% fstat (FreeBSD and maybe OpenBSD): fstat -p <pid>
  +%%    os:cmd("fstat -p " ++ os:getpid() ++ " | grep -v USER | wc -l").
  +%% But this is good enough...
  +num_open_fd_using_list_dir() ->
  +    case file:list_dir("/proc/" ++ os:getpid() ++ "/fd") of
  +        {ok, FDs} ->
  +            length(FDs);
  +        {error, Reason} ->
  +            ?SKIP({failed_listing_fd, Reason})
  +    end.
   
   
   %%======================================================================
  
positive.code: %% -----
  %%
  
  init_per_testcase(_Case, Config) when is_list(Config) ->
      Config.
  
  
negative.code: %% Include files
  %%----------------------------------------------------------------------
  
  -include_lib("kernel/include/file.hrl").
  -include_lib("common_test/include/ct.hrl").
  -include("snmp_test_lib.hrl").
  
  