[issue45915] Use fcntl(fd, F_GETFD) to check whether an fd is valid

[Eryk Sun]

Eryk Sun <eryksun at gmail.com> added the comment:

PR 29821 adds __APPLE__ to the platforms that use fcntl(fd, F_GETFD). Is this okay on macOS, given bpo-30225? Apparently fstat() fails if the other end of a pipe is closed.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45915>
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