8000 bpo-40280: select: Use NULL for empty fdset (GH-31865) by tiran · Pull Request #31865 · python/cpython · GitHub
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merged 1 commit into from
Mar 14, 2022
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bpo-40280: select: Use NULL for empty fdset (GH-31865) #31865

merged 1 commit into from
Mar 14, 2022

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@tiran tiran commented Mar 14, 2022 •
edited by bedevere-bot
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wasm32-emscripten does not support exceptfds and requires NULL. Python
now passes NULL instead of a fdset pointer when the input list is empty.
This works fine on all platforms and might even be a tiny bit faster.

Signed-off-by: Christian Heimes christian@python.org

https://bugs.python.org/issue40280

@tiran
bpo-40280: select: Use NULL for empty fdset
2128fce 
wasm32-emscripten does not support exceptfds and requires NULL. Python
now passes NULL instead of a fdset pointer when the input list is empty.
This works fine on all platforms and might even be a tiny bit faster.

Signed-off-by: Christian Heimes <christian@python.org>
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tiran commented Mar 14, 2022

https://man7.org/linux/man-pages/man2/select.2.html

The principal arguments of select() are three "sets" of file descriptors (declared with the type fd_set), which allow the caller to wait for three classes of events on the specified set of file descriptors. Each of the fd_set arguments may be specified as NULL if no file descriptors are to be watched for the corresponding class of events.

@tiran tiran requested a review from vstinner March 14, 2022 11:42
@tiran tiran changed the title bpo-40280: select: Use NULL for empty fdset bpo-40280: select: Use NULL for empty fdset (GH-31865) Mar 14, 2022
@tiran tiran merged commit f00ced8 into python:main Mar 14, 2022
@tiran tiran deleted the bpo-40280-select branch March 14, 2022 13:40
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Post-merge review: LGTM :-) If tomorrow we discover a platform which really requires a non-NULL pointer, we can fix that platform but keep the new behavior on most platforms. IMO passing NULL is perfectly fine.

carljm pushed a commit to carljm/cpython that referenced this pull request Mar 14, 2022 
* main: (94 commits)
  Revert "bpo-46986: Upgrade bundled setuptools to 60.9.3 (pythonGH-31820)" (pythonGH-31879)
  bpo-30677: [doc] mention that os.mkdir() can raise FileNotFoundError (pythonGH-31548)
  git ignore Lib/site-packages (pythonGH-31862)
  bpo-31415: importtime was made by Inada Naoki (pythonGH-31875)
  bpo-46920: Remove code that has explainers why it was disabled (pythonGH-31813)
  bpo-46920: Remove disabled debug code added decades ago and likely unnecessary (pythonGH-31812)
  bpo-46920: Remove code that has no explainer why it was disabled (pythonGH-31814)
  bpo-46906: Mention native endian in PyFloat_Pack8() doc (pythonGH-31866)
  bpo-40280: select: Use NULL for empty fdset (pythonGH-31865)
  CI: Fix patchcheck (pythonGH-31708)
  bpo-46987: Remove _PySys_GetObjectId / _PySys_GetObjectId (pythonGH-31835)
  bpo-46994: Accept explicit contextvars.Context in asyncio create_task() API (pythonGH-31837)
  bpo-39829: Fix `__len__()` is called twice in list() constructor (pythonGH-31816)
  bpo-47003: Cleanup _overlapped module (pythonGH-31848)
  bpo-47004: Sync with importlib_metadata 4.11.3. (python#31854)
  bpo-46986: Upgrade bundled setuptools to 60.9.3 (pythonGH-31820)
  bpo-46985: Upgrade bundled pip to 22.0.4 (pythonGH-31819)
  bpo-46805: Add low level UDP socket functions to asyncio (pythonGH-31455)
  bpo-46995: Deprecate missing asyncio.Task.set_name() for third-party task implementations (pythonGH-31838)
  bpo-43215: Document Happy Eyeballs args of asyncio.open_connection (pythonGH-24525)
  ...
@tiran tiran mentioned this pull request Mar 15, 2022
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@SimonBiggs SimonBiggs mannequin mentioned this pull request Jun 7, 2022
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@asvetlov asvetlov asvetlov approved these changes

@vstinner vstinner Awaiting requested review from vstinner

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