Socket usage in PlainSocketImpl.initProto()

[Alan Bateman]

Jeffrey Sinclair wrote:
> hotspot-dev,
>
> I've been looking at the lsof output of my hotspot process and noticed
> the following:
>
> java    14429 jeffsinc    8r  sock     0,4             3932632 can't
> identify protocol
>
> The above appears on the first ServerSocket that is ever opened and
> remains after all ServerSockets have been closed. After a little
> investigation I've found that the socket is opened in the initialization
> of the PlainSocketImpl class, specifically in the native initProto()
> method.
>
> I'm curious to know what is done in the network stack initialization
> phase that requires a socket to be opened as well as for the socket to
> remain open thereafter.
>
> Jeff
>   
This sounds like the loopback connection that is used for the 
asynchronous close mechanism. You might want to bring this up on the 
net-dev mailing list to get more details.

-Alan