纸上得来终觉浅，绝知此事要躬行
http://askubuntu.com/questions/449132/why-use-a-named-pipe-instead-of-a-file http://stackoverflow.com/questions/175579/what-are-named-pipes https://groups.google.com/a/chromium.org/forum/#!topic/chromium-os-discuss/MC7qaqa1JsY