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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>
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