trace_process_messages.erl

%% @copyright Geoff Cant 2009, 2010
%% @author Geoff Cant <nem@erlang.geek.nz>
%% @version {@vsn}, {@date} {@time}
%% @doc Erlang shell code to trace the messages for one process.
%% @end

dbg:stop_clear(),
f(GL).
GL=group_leader(),
dbg:tracer(process,
           {fun (Msg, State) ->
                    {_,_,Mics} = erlang:now(),
                    {_,{H, M, Secs}} = calendar:local_time(),
                    Micros = Mics div 1000,
                    Seconds = Secs rem 60 + (Micros / 1000),
                    case Msg of
                        {trace, Pid, 'receive', TMsg} ->
                            io:format(GL, "~n~p:~p:~p ~p < ~p~n",
                                      [H, M, Seconds, Pid, TMsg]);
                        {trace, Pid, 'send', TMsg, ToPid} ->
                            io:format(GL, "~n~p:~p:~p ~p > ~p: ~p~n",
                                      [H, M, Seconds, Pid, ToPid, TMsg]);
                        _Else ->
                            io:format(GL, "~n~p:~p:~p ~p~n",
                                      [H, M, Seconds, Msg])

                    end,
                    State
            end,
            undefined}).

f(Trace).
Trace = fun(Pid) -> dbg:p(Pid, [m]) end.