[issue26343] os.O_CLOEXEC not available on OS X

[Ned Deily]

Ned Deily added the comment:

This is only one example of many cases of calls and options that are exposed by the os module but are not available on specific platforms or platform releases.  It would be a huge documentation effort to try to identify and keep them all up-to-date.  The fourth bullet at the beginning of the "os" module doc page is intended to cover this:

"An “Availability: Unix” note means that this function is commonly found on Unix systems. It does not make any claims about its existence on a specific operating system."

https://docs.python.org/3/library/os.html#module-os

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<http://bugs.python.org/issue26343>
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