RFR 8187631 : Refactor FileDescriptor close implementation

[Alan Bateman]

On 18/09/2017 20:28, Roger Riggs wrote:
> In anticipation of the re-opening (not yet) of the JDK 10 repo please 
> review refactoring
> the handling of closing of files in FileInputStream, FileOutputStream, 
> RandomAccessFile,
> and FileChannelImpl and related native code.
>
> The refactoring enables a future improvement to use the cleaner to 
> close raw fds
> when the FileDescriptors becomes unreferenced.
>
> Webrev:
>    cr.openjdk.java.net/~rriggs/webrev-fd-refactor-8187631/
>
> Issue:
>   https://bugs.openjdk.java.net/browse/JDK-8187631
This looks okay to me.

One thing to clear up in JavaIOFileDescriptorAccess is the parameter 
names as it seems to use "obj" in some places, "fd" in others.

-Alan