natPlainSocketImplWin32 fix and natPlainSocketImplPosix adjustment

[Marco Trudel]

Hello list

If a remote host closes a socket connection, posix throws an 
IOException. Win32 doesn't do anything because WSAECONNRESET is set and 
this is ignored (it looks like it's the equivalent to the "Broken pipe" 
errno on posix).
The consequences are, that on win32 an application just continues 
sending data until all data is sent.

Another thing is, that sun jvms throw SocketException, not IOException. 
I adapted both files for that.

The copyright assignment isn't done yet, but I think we can discuss the 
patch anyway. I will repost it (as well as the security patch) as soon 
as the assignment stuff has taken place.

Comments, hints?


Marco
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