[issue17428] replace readdir to readdir_r in function posix_listdir

[R. David Murray]

R. David Murray added the comment:

My man page says "The  data  returned by readdir() may be overwritten by subsequent calls to readdir() for the same directory stream."  Ross I believe was quoting from the posix *spec*, so that is a more complete explanation.  If an implementation is doing what you said, it would be out of compliance with posix.

Python opens a new directory stream inside listdir, and that directory stream is not exposed to the Python code, so there is no way for another Python thread to cause a problem here.

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nosy: +r.david.murray

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