[issue15176] Clarify the behavior of listdir(fd) in both code and documentation

[Larry Hastings]

Larry Hastings <larry at hastings.org> added the comment:

Nevermind, I'm an idiot.  fdopendir doesn't support dir_fd as a separate path, so listdir can't support it either.

There's an unwritten property of the os module on a POSIX system: all the functions are essentially-atomic.  This is useful and should not be broken lightly.

I'll make a patch clarifying the behavior of listdir.

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<http://bugs.python.org/issue15176>
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