[erlang-questions] erlang:trace and bad argument

[Raimo Niskanen]

On Sun, Sep 14, 2008 at 11:33:06AM +0100, Joel Reymont wrote:
> What am I doing wrong here?
> 
> 20> erlang:trace(self(), false, [send]).
> 1
> 21> erlang:trace(self(), true, [send]).
> ** exception error: bad argument
>       in function  erlang:trace/3
>          called as erlang:trace(<0.93.0>,true,[send])
> 22> erlang:trace(self(), true, [call]).
> ** exception error: bad argument
>       in function  erlang:trace/3
>          called as erlang:trace(<0.99.0>,true,[call])

I think it is that you do not give a {tracer,Tracer}
flag, and the default is {tracer,self()}, which is
not allowed for arg1 = self(). You can not trace yourself.

> 
> 	Thanks, Joel
> 
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> 
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/ Raimo Niskanen, Erlang/OTP, Ericsson AB