closing a listening socket by port number

[Rodolphe Duge de Bernonville]

Willem Broekema a écrit :
> 
> I want to close a listening socket by its port number.
> 
> I have an application that should start a listening socket on a
> predefined port. Instead of return "{badmatch,{error,eaddrinuse}}",
> it should exit, or at least close the socket of, that process and
> take its place.
> 
> Is it possible?
> 

you should also do that in the module that open the socket : 

setsockopt with SO_REUSEADDR

example from different erl files :

   gen_tcp:listen(Port, [binary, {packet,cdr}, {reuseaddr,true}])
  
doc : 
   http://www.erlang.org/doc/r8b/lib/kernel-2.7/doc/html/inet.html