-1 and orderly socket shutdown

[Leon Finker]

I was referring to AsynchronousSocketChannel. But I guess it's to keep it
the same as SocketChannel. In AsynchronousSocketChannel one would not get 0
bytes read for tcp, correct? One can get 0 bytes for udp.

-----Original Message-----
From: Alan.Bateman at Sun.COM [mailto:Alan.Bateman at Sun.COM] 
Sent: Wednesday, April 22, 2009 3:56 PM
To: Leon Finker
Cc: nio-discuss at openjdk.java.net
Subject: Re: -1 and orderly socket shutdown

Leon Finker wrote:
>
> Is there a reason that result of -1 is used instead of somewhat 
> universal 0 for detecting graceful shutdown on recv side for sockets? 
> Thanks!
>
EOF can't be indicated by 0 as otherwise you couldn't distinguish it 
from cases where zero bytes are read (say a SocketChannel configured in 
non-blocking mode).

-Alan.