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bpo-39239: epoll.unregister() no longer ignores EBADF#17882

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Jan 7, 2020
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bpo-39239: epoll.unregister() no longer ignores EBADF#17882
vstinner merged 1 commit intopython:masterfrom
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@vstinner vstinner commented Jan 6, 2020 •
edited by bedevere-bot
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The select.epoll.unregister() method no longer ignores the EBADF
error.

https://bugs.python.org/issue39239

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bpo-39239: epoll.unregister() no longer ignores EBADF
dcf6802 
The select.epoll.unregister() method no longer ignores the EBADF
error.
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vstinner commented Jan 7, 2020

cc @tiran @giampaolo @pitrou

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I don't recall why I ignored EBADF here. Victor has made a compelling argument to stop ignoring the error. I trust his judgement.

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vstinner commented Jan 7, 2020

cc @1st1 @asvetlov

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I agree with the pull request.
Silent ignoring of an error was a bad idea and looks like oversight.

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vstinner commented Jan 7, 2020

@asvetlov: "I agree with the pull request. Silent ignoring of an error was a bad idea and looks like oversight."

Do you expect EBADF errors in legit asyncio code? I don't think so. asyncio is not supposed to unregister a closed FD. I mean: I don't see why I would happen, except if the application does something wrong, no?

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asvetlov commented Jan 7, 2020 •
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I don't see why I would happen, except if the application does something wrong, no?

You are correct.
Since the PR is green I assume the change is safe; I don't recall any misusage in asyncio code.
To double-check you can add test-with-buildbot label and see the result; I don't expect a failure though.

@vstinner vstinner merged commit 5b23f76 into python:master Jan 7, 2020
@vstinner vstinner deleted the epoll_ebadf branch January 7, 2020 14:00
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vstinner commented Jan 7, 2020

Thanks for your trust @tiran and @asvetlov ;-)

To double-check you can add test-with-buildbot label and see the result; I don't expect a failure though.

I'm overconfident and merged my PR :-) If I break a buildbot worker, I will fix it ;-)

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+1

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vstinner commented Jan 7, 2020

@giampaolo: "+1"

Oh ok, so I wasn't the only one surprised by ignoring silently EBADF ;-)

shihai1991 pushed a commit to shihai1991/cpython that referenced this pull request Jan 31, 2020
@vstinner @shihai1991
bpo-39239: epoll.unregister() no longer ignores EBADF (pythonGH-17882)
925217b 
The select.epoll.unregister() method no longer ignores the EBADF
error.
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@asvetlov asvetlov asvetlov approved these changes

@tiran tiran tiran approved these changes

@giampaolo giampaolo giampaolo approved these changes

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