RFR [14] 8236441: Bound MulticastSocket fails when setting outbound interface on Windows

[Alan Bateman]

On 20/12/2019 22:34, Chris Hegarty wrote:
>
> Thanks Alan,
>
> 1) I updated the file descriptor check from ` > 0` to ` >= 0`
> 2) Removed the pre-existing incorrect comment, and
> 3) Added a few more test scenarios that check the index = 0 cases
>
> Updated webrev:
> https://cr.openjdk.java.net/~chegar/8236441/webrev.01/
>
The implementation changes land the test looks good. It's very platform 
specific as to whether multicast datagrams can be received when bound to 
a specific address so I assume this is why this issue could have existed 
for a long time without being noticed.  The "compare against" line  in 
the webrev looks like it's for jdk/jdk but I assume it is for jdk/jdk14, 
the changes are good for both.

-Alan