使用X11，如何在忽略某些事件的同时“远离键盘”获取用户的时间？

I'm making a little application that needs to know how long the user has been idle — as in, not using a keyboard or a mouse. Both XCB and Xlib promise to give me idle time through their respective screensaver extensions. Here is where I get idle time with XCB:I'm making a little application that needs to k