[WGH_]

You could put epoll fd in non-blocking mode, wrap it with os.NewFile, use SyscallConn() to get syscall.RawConn object, and then use its Read method. Its Read method is special: you can return "not ready", and it will use the Go runtime poller to wait until it's readable, in this particular case effectively putting epoll in a epoll.

In epoll case, using RawConn.Read would look like this:

    err := rawConn.Read(func(fd uintptr) bool {
        nevents, err = syscall.EpollWait(int(fd), events[:], 0)
        if nevents == 0 {
            return false // try again
        }
        return true
    })

Note that using RawConn.Read here is only necessary because epoll needs epoll_wait(2) instead of typical read(2). For ordinary file descriptors, like pipes, etc., setting them to non-blocking mode, wrapping them with os.NewFile, and using its ordinary Read/Write methods is sufficient.