Groups > comp.lang.java.programmer > #9259

Re: Setting TCP parameters for Socket?

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From	Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: Setting TCP parameters for Socket?
Date	Thu, 27 Oct 2011 23:35:15 +0200
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On 27/10/2011 18:48, markspace allegedly wrote:
> Sahm's post reminded me about this:
> 
> Investigating Socket::isReachable() a while back, I discovered that the
> Socket constructor actually establishes a TCP connection.  This means
> you can't set TCP parameters for the inital connection.  For example,
> SO_TIMEOUT.
> 
>   Socket sock = new Socket( hostname, port );
>   sock.setSoTimeout( 6000 );    // too late!
> 
> There's no way that I can see to change the time out of the initial
> connection, which occurs in the first line above, in the constructor.
> You can set the time out for subsequent reads, but not the first connect.
> 
> Does anyone know of a way to control various TCP parameters, esp. the
> time out, for the Socket constructor?

<http://download.oracle.com/javase/6/docs/api/java/net/Socket.html>

Socket(InetAddress address, int port)
  Creates a stream socket *and connects it* to the specified port number
at the specified IP address.

Socket()
  Creates an *unconnected socket*, with the system-default type of
SocketImpl.

-- 
DF.
Determinism trumps correctness.

Thread

Setting TCP parameters for Socket? markspace <-@.> - 2011-10-27 09:48 -0700
  Re: Setting TCP parameters for Socket? markspace <-@.> - 2011-10-27 10:10 -0700
    Re: Setting TCP parameters for Socket? markspace <-@.> - 2011-10-27 11:16 -0700
  Re: Setting TCP parameters for Socket? Steven Simpson <ss@domain.invalid> - 2011-10-27 20:41 +0100
  Re: Setting TCP parameters for Socket? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-10-27 23:35 +0200
    Re: Setting TCP parameters for Socket? markspace <-@.> - 2011-10-27 15:40 -0700

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