How to develop linux screen saver

Does anyone have a link or document on how to write a screensaver for Linux?

From stackoverflow

• Google "xscreensaver", and you can learn from its code, rather than starting from scratch.

• This might be of interest to you:

  http://www.jwz.org/xscreensaver/faq.html#writing-savers

  it's from the xscreensavers homepage, it's sort of the de facto screensaver

• Here's some info on xscreensaver that you may find of use: xscreensaver also there's an FAQ here.

  There's a simple tutorial here too: simplesquares (from the first link)