[3.9] closes bpo-38156: Always handle interrupts in PyOS_StdioReadline. (GH-21569) #21670
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This consolidates the handling of my_fgets return values, so that interrupts are always handled, even if they come after EOF.
I believe PyOS_StdioReadline is still buggy in that I/O errors will not result in a proper Python exception being set. However, that is a separate issue.
(cherry picked from commit a74eea2)
Co-authored-by: Benjamin Peterson [email protected]
https://bugs.python.org/issue38156