Atom gdk_x11_get_xatom_by_name ( const gchar* atom_name )
Returns the X atom for GDK’s default display corresponding to
This function caches the result, so if called repeatedly it is much
faster than XInternAtom(), which is a round trip to the server each time.
The data is owned by the caller of the function. The value is a NUL terminated UTF-8 string.