JDK 9 RFR of 8165000: Selector.select(timeout) throws IOException when timeout is a large long

[Langer, Christoph]

Hi Brian,

I'm wondering, if we knew that the maximum accepted value for timeout is 0x7fffffff, then we should probably cap the timeout before calling kevent?

But other than that, I also don't find any documentation about the maximum accepted timeout or why it obviously needs to be 32bit int max. That would be a question for the Apple guys, I guess.

Best regards
Christoph

> -----Original Message-----
> From: nio-dev [mailto:nio-dev-bounces at openjdk.java.net] On Behalf Of Brian
> Burkhalter
> Sent: Mittwoch, 31. August 2016 22:49
> To: nio-dev <nio-dev at openjdk.java.net>
> Subject: JDK 9 RFR of 8165000: Selector.select(timeout) throws IOException
> when timeout is a large long
> 
> Please review at your convenience.
> 
> Issue:	https://bugs.openjdk.java.net/browse/JDK-8165000
> Patch:	http://cr.openjdk.java.net/~bpb/8165000/webrev.00/
> 
> For some unknown reason Selector.open().select(timeout) fails with an
> IOException due to an EINVAL error in kevent() [1] when timeout >=
> 100000001000L. This was reported on Mac OS 10.11.6 and verified on 10.9.5. It
> occurs in both the most recent JDK 8 build and in the JDK 9 EA build. As noted in
> a comment on the issue, there are several ways to address this of which the
> above patch is one. I am not sure it is the correct path so any comments are
> welcome. It would be nice to know for example why kevent() apparently has a
> limit on the timeout size and whether this is documented anywhere. I have not
> located any such information.
> 
> Thanks,
> 
> Brian
> 
> [1]
> https://developer.apple.com/library/ios/documentation/System/Conceptual/M
> anPages_iPhoneOS/man2/kevent.2.html