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On OpenBSD 5.2, calling getsockname on an unbound Unix domain socket
results in a successful syscall, however the AF is unset and the length
is returned as zero. This has been changed to more portable behaviour,
which will be included in the OpenBSD 5.3 release.

For now, work around this by treating a successful getsockname() call
that returns a family of AF_UNSPEC and length of zero as a AF_UNIX
socket.

Makes TestPassFD work on OpenBSD 5.2.

Fixes #4956.

R=golang-dev, minux.ma, rsc, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/7449046

Update #4956.

R=golang-dev
CC=golang-dev
https://golang.org/cl/7417048

Fixes #3349.

R=bradfitz, dave, minux.ma
CC=golang-dev
https://golang.org/cl/7383056

Fixes #3348.

R=devon.odell, minux.ma, bradfitz, mdempsky
CC=golang-dev
https://golang.org/cl/7406050

Re-submitting previously reverted change 160ec5506cb7.

R=golang-dev, r, r
CC=golang-dev
https://golang.org/cl/6129052

We can revisit the issue of testing in syscall after Go 1.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5844057

Updates #1101

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/5849057