ivykis is a library for asynchronous I/O readiness notification. It is a thin, portable wrapper around OS-provided mechanisms such as /dev/poll, epoll_create(2), kqueue(2), poll(2), and port_create(3C). ivykis was mainly designed for building high-performance network servers, but can be used as building block for any kind of event-driven application that uses poll(2)able file descriptors as its inputs.