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On Oct 24, 2011, at 1:31 PM, Rickard Green wrote:

> $ man kqueue
> ...
> BUGS
>     Not all filesystem types support kqueue-style notifications.  And even some that do, like some remote filesystems, may only support a subset of the notification semantics described here.

As far as I've been told on the darwin-dev list, that refers to vnode-watching which select() doesn't support anyway.

> $ man poll
> ...
> BUGS
>     The poll() system call currently does not support devices.


This is, likely, a legacy consideration as kqueue was not complete in earlier versions of Mac OSX. 

select and poll are subsets of kqueue functionality-wise.

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