[release-branch.go1.23] os: dup pidfd if caller sets PidFD manually
For #68984.
Fixes #69119.
Change-Id: I16d25777cb38a337cd4204a8147eaf866c3df9e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/607695
Reviewed-by: Kirill Kolyshkin <kolyshkin@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Commit-Queue: Ian Lance Taylor <iant@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
(cherry picked from commit
239666cd7343d46c40a5b929c8bec8b532dbe83f)
Reviewed-on: https://go-review.googlesource.com/c/go/+/611415
Auto-Submit: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Bypass: Dmitri Shuralyov <dmitshur@golang.org>