commit bb24a47a89eac6c1227fbcb2ae37a8b9ed323366
author Luca Bruno <luca.bruno@coreos.com> Wed Aug 30 08:51:02 2017 +0000
committer Ian Lance Taylor <iant@golang.org> Wed Aug 30 13:42:02 2017 +0000
tree 73a244421b40fc17d893ba7ff144be90288033f5
parent ab9e364efd8b52800ff7ee48a9ffba4e0ed78dfb

unix: drop dummy byte for oob in unixgram SendmsgN

This commit relaxes SendmsgN behavior of introducing a dummy 1-byte
payload when sending ancillary-only messages.
The fake payload is not needed for SOCK_DGRAM type sockets, and actually
breaks interoperability with other fd-passing software (journald is one
known example). This introduces an additional check to avoid injecting
dummy payload in such case.

Backport of https://go.googlesource.com/go/+/93da0b6e66f24c4c307e0df37ceb102a33306174
Full reference at https:/golang.org/issue/6476#issue-51285243

Change-Id: I7cf00a1c7cde75fe62e00b98ccba6ac8469b0493
Reviewed-on: https://go-review.googlesource.com/60190
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>