Patch for JTreg test java/net/MulticastSocket/SetOutgoingIf.java

[Alan Bateman]

Pavel Tisnovsky wrote:
> Hi,
>
> two-lines patch for regression test 
> java/net/MulticastSocket/SetOutgoingIf.java is exposed at 
> http://cr.openjdk.java.net/~ptisnovs/JTReg_SetOutgoinIf/
>
> The test machine (where this test fails) has six network interfaces, 
> but only two of them, namely eth2 and virbr0, can be used to send 
> multicast packets. But the test does not check interface attributes 
> and tries to use _ALL_ network interfaces (excluding loopback device, 
> of course) to send and then receive multicast packets.
>
> It fails, but the failure message depends on current network interface 
> order (order is not guaranteed) returned by 
> NetworkInterface.getNetworkInterfaces(). Patch check, if the given
> network interface is able to send multicast packets.
>
> I think, the patch could be applied to OpenJDK6 too.
>
> Pavel Tisnovsky
Pavel - this looks good me, although I think you should send it to 
net-dev. To make it more reliable you could also check isUp as 
getNetworkInterface may enumerate network interfaces that are down.

-Alan.