gh-118986: expose socket.IPV6_RECVERR

[chrysn]

This adds two socket option numbers, without which the existing MSG_ERRQUEUE gives barely any benefits.

• Issue: socket.IP{,V6}_RECVERR not exposed #118986

[chrysn]

This has missed the 3.14 alpha; may I ask for a review again to have this available next round?

@Eclips4 and @jeremyhylton would be suitable reviewers given the history of #120056.

[Eclips4]

Please, modify the lines stated below to include the IPV6_RECVERR.

cpython/Doc/library/socket.rst

Lines 453 to 455 in 0d88b99

	.. versionchanged:: 3.14
	Added missing ``IP_RECVERR``, ``IP_RECVTTL``, and ``IP_RECVORIGDSTADDR``
	on Linux.

[chrysn]

Adjusted as requested.

You pointed at the lines for Python 3.14 -- do I read this right that this PR can become part of 3.14 still?

[Eclips4]

You pointed at the lines for Python 3.14 -- do I read this right that this PR can become part of 3.14 still?

Yes, you understand that correctly! Python 3.14 is in development stage and two days ago was released the first alpha of 3.14, so we have more than half a year to implement new features for 3.14 version. For more information see https://peps.python.org/pep-0745/

If your question was about backporting to versions 3.12 and 3.13, sorry, we can't do that, because this PR is considered a feature request and versions 3.12 and 3.13 only accept security and bug fixes.

[Eclips4]

Thanks! I'll let it unmerged for some time to get a review from others if they have something to say.

[sobolevn]

Thanks!

[Eclips4]

@chrysn, in the future, please avoid force pushes as they make PRs difficult to review. Commits are squashed anyway before merging, so it doesn't matter how many commits you need to complete a PR :)

[Eclips4]

This adds two socket option numbers, without which the existing MSG_ERRQUEUE gives barely any benefits.

You've said that there are two new socket constants, but in fact, this PR contains only one. Did you forget to add the second one?

[chrysn]

The issue was originally about adding two constants (I've updated the title but kept the original post).

One of the constants was already added after this PR was filed in a different PR (#120056), so when I updated this PR, only one was left.

[sobolevn]

Thank you!