认识
官网：
文档：https://www.x.org/releases/current/doc/libX11/libX11/libX11.html
仓库：https://gitlab.freedesktop.org/xorg/lib/libx11
Xlib is a C subroutine library that application programs (clients) use to interface with the window system by means of a stream connection.
Xlib (also known as libX11) is an X Window System protocol client library written in the C programming language. It contains functions for interacting with an X server. These functions allow programmers to write programs without knowing the details of the X protocol.
参考
Wikipedia / Xlib / https://en.wikipedia.org/wiki/Xlib