[2020-02][System.Native] Handle ReadDir EINTR #21029
Merged
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Manual backport of #21016
Handle EINTR for opendir/readdir/closedir.
Because of how thread aborts work, we must loop in managed.
A thread abort will break syscalls and return EINTR, but mono will not raise a
ThreadAbortException until a pinvoke returns.
(Despite the documentation, opendir/readdir/closedir sometimes return EINTR on
macOS Big Sur.)
Related to #20799
Bump corefx to mono/corefx@9174bbeb7e