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_socket.py: fix for systems where AI_NUMERICSERV is not defined #3135

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Rationale: on some platforms AI_NUMERICSERV may not be defined. In particular, old versions of macOS, possibly some other. While affected users are probably few, it is a trivial fix, which makes trio usable (for example, yewtube app works then).

Credits to @CoolCat467
Closes: #3133

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codecov bot commented Nov 12, 2024

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00000%. Comparing base (0ea9328) to head (3f7b30e).

Additional details and impacted files
@@               Coverage Diff               @@
##                 main        #3135   +/-   ##
===============================================
  Coverage   100.00000%   100.00000%           
===============================================
  Files             124          124           
  Lines           18779        18780    +1     
  Branches         1269         1269           
===============================================
+ Hits            18779        18780    +1     
Files with missing lines Coverage Δ
src/trio/_socket.py 100.00000% <100.00000%> (ø)
🚀 New features to boost your workflow:
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

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Looks good, but needs newsfragment (that is why continuous integration is failing). newsfragments folder's README file has more information.

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@CoolCat467 That one CI which fails is unrelated, right?

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A5rocks commented Nov 12, 2024

@CoolCat467 That one CI which fails is unrelated, right?

Docs are failing because your newsfragment is using markdown not rST. Try doing socket.AI_NUMERICSERV instead of AI_NUMERICSERV (for the automatic linking) or doubling the backticks.

It's a bit confusing because the logs show two warnings, but the one you should care about is:

/home/docs/checkouts/readthedocs.org/user_builds/trio/checkouts/3135/docs/source/history.rst:42: WARNING: py:obj reference target not found: AI_NUMERICSERV [ref.obj]

I don't think the other one makes it fail, though I may be wrong.

Comment on lines 172 to 170
# AI_NUMERICSERV may be missing on some older platforms, so use it when available.
_NUMERIC_ONLY = _stdlib_socket.AI_NUMERICHOST
_NUMERIC_ONLY |= getattr(_stdlib_socket, "AI_NUMERICSERV", 0)
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I think you need to be a bit more specific here, otherwise future people that stumble on this comment will have to do a bunch of research to figure out why/when it might be missing. And as I said in the issue, perhaps even a note on why it's needed despite being deprecated since a decade+

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Maybe just linking the issue will work? That has info.

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@A5rocks A5rocks Dec 7, 2024

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@barracuda156 could you fix this? I think this is the only problem before merging.

(well, barring rejecting this whole change on basis of it being something we cannot test for a system we could not support. IMO this change is fine but @jakkdl didn't respond to the response you left on the issue.)

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Sorry, this got missed.
I will return to this tomorrow.

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Added a link now to the issue into the comment.

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A5rocks commented Mar 20, 2025

Bump @barracuda156

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With newsfragment and link to discussion, I think this should be good to go.

@A5rocks A5rocks requested a review from jakkdl March 22, 2025 06:40
@@ -0,0 +1,2 @@
Fixed socket module for some older systems which lack `socket.AI_NUMERICSERV`.
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Oops CI is still complaining about being unable to find socket.AI_NUMERICSERV. Try this instead:

Suggested change
Fixed socket module for some older systems which lack `socket.AI_NUMERICSERV`.
Fixed socket module for some older systems which lack ``socket.AI_NUMERICSERV``.

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Successfully merging this pull request may close these issues.

AttributeError: module 'socket' has no attribute 'AI_NUMERICSERV'. Did you mean: 'NI_NUMERICSERV'?
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