httpd and native FastCGI basics

Since httpd is replacing apache/nginx, and httpd supports FastCGI,I thought I would learn how to develop native FastCGI applications.But I seem to be having trouble understanding how httpd.confspecifies how to interact with the FastCGI applications. Just to get things started, I was hoping to find

sndio non-blocking with kqueue

From sndio design, it looks like non-blocking (like in sio_write) can be done with poll. sio_pollfd can be used to obtain the pollfd struct which contains the file descriptor fd. The fd descriptor seems to be equivalent to the unix stream for the sound playing device. Would it be possible to