I don't understand your point; kqueue is a comparatively new idea. Do you want signals written as messages across ZeroMQ? In that case, look at Mac OS X's use

I don't understand your point; kqueue is a comparatively new idea. Do you want signals written as messages across ZeroMQ? In that case, look at Mac OS X's use of Mach ports for exception handling, which is an even older idea than kqueue.