On Sun, Jan 10, 2016 at 5:26 PM,  <git / chuckremes.com> wrote:
> Issue #11973 has been reported by Chuck Remes.
>
> ----------------------------------------
> Bug #11973: IO#advise should raise NotImplementedError on platforms that do not support that call
> https://bugs.ruby-lang.org/issues/11973
>
> * Author: Chuck Remes
> * Status: Open
> * Priority: Normal
> * Assignee:
> * ruby -v: 2.4.0
> * Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
> ----------------------------------------
> Right now IO#advise returns nil when passed legal arguments even on platforms that do not support that POSIX function (like OS X). To be consistent with other calls in core, I think that IO#advise should raise NotImplementedError for unsupported platforms.

Simply impossible.
For example, Linux define POSIX_FADV_NOREUSE, but not implement AND no
error return. Then, IO#advise return nil and just no-op in this case.

We can implement raise NotImplementedError SOME CASES and not raise
another some cases. But nobody want such inconsistency mess.

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