I completely agree that existing kevent interface is not the best, so
I'm opened for any suggestions.
Should kevent creation/removing/modification be separated too?

Yeah, I think so.

quoted

quoted

Hmm, it looks like I'm lost here...

Yeah, it seems my description might not have sunk in :).  We're giving
userspace a way to collect events without performing a system call.

And why do we want this?

So that event collection can be very efficient.

How glibc is supposed to determine, that some events already fired and
such requests will return immediately, or for example how timer events
will be managed?

...

That was what my previous mail was all about!

- z