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net: Make Listen(":port") use IPv6 when IPv4 is not supported.
When running an experimental kernel with IPv4 disabled, Listen(":port") currently tries to create an AF_INET socket, and fails. Instead, it should see !supportsIPv4, and use an AF_INET6 socket. This sort of environment is quite esoteric at the moment, but I can force the tests to fail on regular Linux using the following tweaks: - net/net.go: supportsIPv4, supportsIPv6, supportsIPv4map = false, true, false - net/sockopt_linux.go: ipv6only=true - net/ipsock_posix.go: Revert this fix - ./make.bash && ../bin/go test net Also, make the arrows in server_test.go point to the left, because server<-client is easier to read. Fixes #12510 Change-Id: I0cc3b6b08d5e6908d2fbf8594f652ba19815aa4b Reviewed-on: https://go-review.googlesource.com/14334 Run-TryBot: Paul Marks <email@example.com> Reviewed-by: Brad Fitzpatrick <firstname.lastname@example.org> TryBot-Result: Gobot Gobot <email@example.com>
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