Issue #11973 has been reported by Chuck Remes.

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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
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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.

A similar topic on IO#advise was recently discussed in https://bugs.ruby-lang.org/issues/11806#note-6.

To support this idea, I'd like to point to how File#link behaves in a similar situation on platforms that do not support hard links in the filesystem. It raises NotImplementedError.

https://github.com/ruby/ruby/blob/trunk/file.c#L2723

I am bringing up this issue so we can make Ruby behave more consistently and behave in a consistent manner when trying to access functions on unsupported platforms.



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