RFR(XS): 8217311: Improve Exception thrown when MulticastSocket.setInterface fails on AIX(Unix)

[Chris Hegarty]

> On 17 Jan 2019, at 09:54, Langer, Christoph <christoph.langer at sap.com> wrote:
> 
> Hi,
>  
> please help to review a tiny fix.
>  
> While working on the issue with the AIX multicast tests (https://bugs.openjdk.java.net/browse/JDK-8207404 <https://bugs.openjdk.java.net/browse/JDK-8207404>), I found a place where a SocketException thrown in a specific error case could be improved. There already exists code to throw a SocketException with the text "IPV6_MULTICAST_IF failed (interface has IPv4 address only?) " when setsockopt(IPV6_MULTICAST_IF) fails with EINVAL. On AIX, when you have IPv4 addresses only on an interface, you’ll run into when setting the option on an AF_INET6 socket. So that specific SocketException text would match very well then. I guess the addition is fine to be platform independent. At best on other platforms EADDRNOTAVAIL is never seen at that place. Or if it was, it would certainly have to do with an IP address problem on the interface...
>  
> Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8217311.0/ <http://cr.openjdk.java.net/~clanger/webrevs/8217311.0/>
Looks ok.

-Chris.

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