[erlang-questions] Simple TCP Server

Bob Ippolito <>
Tue Dec 17 20:49:43 CET 2013


What's the full traceback? How are you attempting to execute this? Are you
starting inets first?

On Tuesday, December 17, 2013, Ari King wrote:

> Hi,
>
> The code below results in "init terminating in do_boot." Seemingly the
> problem is on line 5, does anyone see what is wrong with it? Additionally,
> I'm trying to pass the port in as a command line argument, but for some
> reason it doesn't work and I need to hardcode it.
>
> -module(mock_tcp).
> -export([start/1]).
>
> start([Port, Filename]) ->
>   {ok, Listen} = gen_tcp:listen(Port, [binary]),
>   spawn(fun() -> connect(Listen, Filename) end),
>   io:format("Server available on port ~w. Reading from file ~w.", [Port,
> Filename]).
>
> connect(Listen, Filename) ->
>   {ok, Socket} = gen_tcp:accept(Listen),
>   spawn(fun() -> connect(Listen, Filename) end),
>   {ok, Device} = file:open(Filename, read),
>   get_data(Device, Socket).
>
> get_data(Device, Socket) ->
>   case io:get_line(Device) of
>     {ok, Data} ->
>       gen_tcp:send(Socket, Data),
>       get_data(Device, Socket);
>     eof ->
>       file:close(Device),
>       gen_tcp:close(Socket)
>   end.
>
> Thanks.
>
> -Ari
>
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