[issue2890] O_ASYNC and FASYNC should be defined for *nix systems

[Andrii V. Mishkovskyi]

Andrii V. Mishkovskyi <mishok13 at gmail.com> added the comment:

These flags are non-posix, linux-specific constants. Python 'os' module
uses 'posix' module for all *nix systems, including those, that do not
support O_ASYNC and FASYNC flags. I think your feature request should be
rejected.

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nosy: +mishok13

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