70a5d9143e
Adding a macro for specifying nonnull attributes, for easier future transition to new C23 attributes or supporting strange compilers that don't understand this attribute. The purpose of using those attributes is aiding compiler warnings and potential optimizations. Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
Windows are then composed on the actual screen by the X server (or by a separate composite manager) as directed by the window manager, which usually communicates with the user via graphical controls such as buttons and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the following article: https://en.wikipedia.org/wiki/X_server
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