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Add watchfd keyword to InProcessKernel OutStream initialization #727

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merged 1 commit into from Jul 13, 2021

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rayosborn
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@rayosborn rayosborn commented Jul 13, 2021

On some systems, the creation of OutStream instances to handle stdout and stderr triggers an exception when using the InProcessKernel. This is because the default keyword arguments creating the stream assume there is a file descriptor and calls fileno, which triggers an io.UnsupportedOperation("fileno") exception. The problem is new to v6. This PR adds watchfd=False to the default OutStreams for both stdout and stderr in the InProcessKernel. This fixes #724.

Setting `watchfd`to False when creating OutStream instances for `stdout` prevents an exception caused by the lack of a file descriptor in the stream used by the InProcessKernel .
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Thank you!

@blink1073 blink1073 added the bug label Jul 13, 2021
@blink1073 blink1073 added this to the 6.0.x milestone Jul 13, 2021
@blink1073 blink1073 merged commit 36d6a91 into ipython:master Jul 13, 2021
@rayosborn rayosborn deleted the fix-inprocess-stdout branch July 13, 2021 16:34
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rayosborn commented Jul 13, 2021

Thank you for the quick response. I will release a new version of NeXpy, which will depend on this update. Is it safe for me to assume that it will be included in the v6.0.2 release? It doesn't matter when that is - I will just adjust my dependencies to include future releases.

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Yes, just waiting for review on the changelog

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Failure to initialize default stdout and stderr in the InProcessKernel
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