[issue26716] EINTR handling in fcntl

[STINNER Victor]

STINNER Victor added the comment:

Patch version 2:

* add a comment to explain the C loop retrying on EINTR error
* add an unit test: I checked that the test fails with InterruptedError without the fix
* document the change in fcntl documentation

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Added file: http://bugs.python.org/file42474/fcntl_eintr-2.patch

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