dbg question

Robert Balogh <>
Tue Feb 3 14:09:07 CET 2004


Hi Siri,

Ok, I understand now...:-)

Can I have an another question about it? So I'd like to trace an erlang node 
which is outside from my workstation (this node is an another WS).  How can 
I do this?
I think, I can see the trace from the remote node if I start the 
dbg:tracer(.....) on my WS and start the dbg client on the remote WS and the 
client will to "forward" all messages to the IP port (to my WS). Am I right?

thank you for your help,
/Robi


>From: "Siri Hansen (EAB)" <>
>Reply-To: 
>To: "Robert Balogh" <>
>CC: 
>Subject: Re: dbg question
>Date: Tue, 3 Feb 2004 08:32:13 +0100
>
>Hi Robert!
>
>For me it works when the trace port is started first. The client needs
>a trace port which it can connect to, else it crashes with connection
>refused.
>
>I agree that it is a bit strange that there is no error returned -
>I'll look into that. But given the current situation, try linking to
>the Pid to see the error message:
>
>1> Pid = dbg:trace_client(ip,4711),link(Pid).
>true
>** exited: {error,econnrefused} **
>2> is_process_alive(Pid).
>false
>3>
>
>
>Starting the trace port first works for me:
>
>4> dbg:tracer(port, dbg:trace_port(ip,4711)).
>{ok,<0.39.0>}
>5> Pid = dbg:trace_client(ip,4711).
><0.41.0>
>6> is_process_alive(Pid).
>true
>7>
>
>BR Siri
>Erlang/OTP
>
>
>Robert Balogh wrote:
> >
> > Hi Vlad,
> >
> > I already tried it, but unfortunatelly it has same behavior...it is not
> > possible to stop the client process, beacuese it is never started (???). 
>But
> > I really don't understand why say "ok,Pid" result when I create the 
>cleint.
> > I think I have a big mistake now....
> > I already read the documentation, but...it is not enough...for me :-(
> >
> > I did that, what is in the documentation in the dbg side step-by-step, 
>but
> > it doesn't works for me...:-(((
> >
> > thanks a lot for your advice,
> >
> > regards,
> > /Robi
> >
> >
> > >From: "Vlad Dumitrescu" <>
> > >To: <>
> > >Subject: Re: dbg question
> > >Date: Mon, 2 Feb 2004 13:48:58 +0100
> > >
> > >Hi,
> > >
> > >I think the dbg:tracer must be started with something like this:
> > >
> > >     dbg:tracer(port, dbg:trace_port(ip,4711)).
> > >
> > >(see the documentation)
> > >
> > >/Vlad
> > >
> > > > I think the dbg:tracer(). is start the dbg server, but I'd like to 
>start
> > > > only the dbg client. But I did what you advice to me. Please see the
> > > > resulst. It is same what I had before.
> > > > I don't know how possible to start the dbg client. :-((
> > > >
> > > > Any other idea....??
> > > >
> > > > Erlang (BEAM) emulator version 5.3 [threads:0]
> > > >
> > > > Eshell V5.3  (abort with ^G)
> > > > ()1> dbg:tracer().
> > > > {ok,<0.37.0>}
> > > > ()2> Pid = dbg:trace_client(ip, {"cp1-1", 4711}).
> > > > <0.40.0>
> > > > ()3> is_pid(Pid).
> > > > true
> > > > ()4> is_process_alive(Pid).
> > > > false
> > > > ()5> dbg:stop
> > > > stop/0               stop_clear/0         stop_trace_client/1
> > > >
> > > > ()5> dbg:stop_trace_client(Pid).
> > > >
> > > > =ERROR REPORT==== 2-Feb-2004::12:53:03 ===
> > > > Error in process <0.30.0> on node '' with exit value:
> > > > {badarg,[{erla
> > > >
> > 
> >ng,exit,[{badpid,<0.40.0>},abnormal]},{dbg,stop_trace_client,1},{erl_eval,do_app
> > > > ly,5},{shell,eval_loop,2}]}
> > > >
> > > > ** exited: {badarg,[{erlang,exit,[{badpid,<0.40.0>},abnormal]},
> > > >                     {dbg,stop_trace_client,1},
> > > >                     {erl_eval,do_apply,5},
> > > >                     {shell,eval_loop,2}]} **
> > > > ()6>
> > > >
> >
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