8211842 IPv6_supported wrongly returns false when unix domainsocket is bound to fd 0
michael.x.mcmahon at oracle.com
Thu Nov 29 20:29:44 UTC 2018
Yes, as Alan said the way IPv6 is set up in the JDK means that either
AF_INET sockets (which are IPv4 only) or
AF_INET6 sockets (which can be IPv4 or IPv6)
It's not possible to mix the two types. If inetd passes an AF_INET
socket on startup then the VM is stuck in IPv4 mode.
I've updated the webrev after the last comments:
It's really just refactoring. So, unless anyone has a comment I will push
the fix shortly.
On 29/11/2018, 19:03, Alan Bateman wrote:
> On 29/11/2018 18:04, Bernd Eckenfels wrote:
>> I wonder if that conclusion „stdin = tcp4 -> disable tcp6“ is correct
>> at all. The started program might serve a v4 connection but it still
>> could want to do ipv6 client connections.
>> If somebody wants to disable v4 they can do it regularly with the
>> System property.
> The check is important because the JDK doesn't support having some
> Socket or SocketChannel objects be created with IPv4 sockets, and
> others with IPv6 sockets. The only exception to this is
> DatagramChannel where the protocol family is exposed in the API. The
> RDMA socket API under discussion on nio-dev will be another case.
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