[erlang-questions] gen_tcp:accept use within a gen_fsm process

Mazen Harake mazen@REDACTED
Mon Jun 25 16:25:11 CEST 2007

A good (better) idea would probably be to create the next state after
init as the accepting state...

init([Listen_socket] = Args) ->
{ok, conn_accept, SD}.

conn_accept(Listening_socket) ->
{ok, Socket} = gen_tcp:accept(Listen_socket),
{ok, conn_accept, SD}.


Listener then listens and gets {ok, LSock},
Then starts a gen_fsm and then send the first event with the LSock as
the argument.

On top of my head :)
Hope you follow what I mean :)


igwan wrote:
> Hello list,
> I'm writing a small TCP test application. I want each TCP connection to 
> be handled by one gen_fsm process. I could have one 'acceptor' process 
> calling gen_tcp:accept, then spawning a gen_fsm for each accepted 
> incoming connection. But in the doc, I read that, since a recent version 
> of Erlang/OTP, I can have any number of processes waiting in a 
> gen_tcp:accept call, so I wouldn't need the acceptor process anymore. My 
> question is about best practice. Where would you call gen_tcp:accept in 
> the gen_fsm module ? Into the init/1 function ? Like this :
> -module(tcptest_fsm).
> -behaviour(gen_fsm).
> init([Listen_socket] = Args) ->
>     {ok, Socket} = gen_tcp:accept(Listen_socket),
>     ...
>     {ok, conn_accepted_state, SD}.
> I'm not very confident about puting such a blocking call at the init 
> phase as the process wouldn't be initialized until a connection arrives 
> and thus not supervised (Am I right ?).
> Or maybe the new possibility offered by gen_tcp:accept wasn't intended 
> for use within a OTP system ?
> Thanks for your help.
> igwan
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> erlang-questions mailing list
> erlang-questions@REDACTED
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Mazen Harake <mazen@REDACTED>
Erlang Software Developer and Consultant,
Erlang Training & Consulting, Ltd

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