unable to reconnect to server

[Dietmar Schaefer]

Hi !


I am trying to establish a connection to a client via gen_tcp:



-module(test3).
-define (PORT,1234).
-export([start/0]).


start() ->
    start(?PORT).

start(Port) ->
   Pid = spawn_link(fun() -> server(Port) end).
   


server(Port) ->
    Opts = [{reuseaddr, true},{packet, 0}, {active, false}],
    {ok,Socket} = gen_tcp:listen(Port,Opts),
    loop(Socket).


loop(Socket) ->
    {ok,Sock} = gen_tcp:accept(Socket),
    register(test,spawn_link(fun() -> do_send(Sock) end)),
    process_flag(trap_exit, true),                    %% get informed 
when server failed     
    loop(Socket).



reqHandler(Sock) ->
    do_send(Sock),
    gen_tcp:close(Sock).


do_send(Socket) ->
    receive
        {msg,Msg} -> io:format("message received ~n"),
                     case fill(integer_to_list(string:len(Msg)),3) of
                         {ok,String} ->                       
                             gen_tcp:send(Socket,String),
                             cmmc_util:msleep(100),
                             gen_tcp:send(Socket,Msg),
                             do_send(Socket);
                         {error,_} -> ok
                     end;
        {action,Action}  -> ok;
        {'EXIT',From,What} -> io:format("Bingo ~n"), gen_tcp:close(Socket)
    end.  



When I terminate the client and try to start it again I get

Error in process <0.322.0> on node 'cmmc@REDACTED' with exit value: 
{badarg,[{erlang,register,[test,<0.325.0>]},{test3,loop,1}]}

What has erlang:register to do with that ?

What's wrong anyway ?


Any hint ?


Regards


Dietmar