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    is_local_pid_dead = win32utils.is_local_pid_dead
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else:
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    is_local_pid_dead = _posix_is_local_pid_dead
 
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def fdatasync(fileno):
 
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    """Flush file contents to disk if possible.
 
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    :param fileno: Integer OS file handle.
 
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    :raises TransportNotPossible: If flushing to disk is not possible.
 
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    """
 
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    fn = getattr(os, 'fdatasync', getattr(os, 'fsync', None))
 
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    if fn is not None:
 
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        fn(fileno)