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fsync 

        # IO.fsync

(from ruby core)
---
    fsync -> 0

---

Immediately writes to disk all data buffered in the stream, via the
operating system's `fsync(2)`.

Note this difference:

*   IO#sync=: Ensures that data is flushed from the stream's internal
    buffers, but does not guarantee that the operating system actually
    writes the data to disk.
*   IO#fsync: Ensures both that data is flushed from internal buffers,
    and that data is written to disk.


Raises an exception if the operating system does not support `fsync(2)`.

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