X Window System Unified Protocol

This package provides the headers and specification documents defining the core protocol and (many) extensions for the X Window System. The extensions are those common among servers descended from X11R7. It also includes a number of headers that aren't purely protocol related, but are depended upon by many other X Window System packages to provide common definitions and porting layer.

Though the protocol specifications herein are authoritative, the content of the headers is bound by compatibility constraints with older versions of the X11 suite. If you are looking for a machine-readable protocol description suitable for code generation or use in new projects, please refer to the XCB project:

https://xcb.freedesktop.org/ https://gitlab.freedesktop.org/xorg/proto/xcbproto

All questions regarding this software should be directed at the Xorg mailing list:

https://lists.x.org/mailman/listinfo/xorg

The primary development code repository can be found at:

https://gitlab.freedesktop.org/xorg/proto/xorgproto

Please submit bug reports and requests to merge patches there.

For patch submission instructions, see:

https://www.x.org/wiki/Development/Documentation/SubmittingPatches

Updating for new Linux kernel releases

The XF86keysym.h header file needs updating whenever the Linux kernel adds a new keycode to linux/input-event-codes.h. See the comment in include/X11/XF86keysym.h for details on the format.

The steps to update the file are:

• if the kernel release did not add new KEY_FOO defines, no work is required
• ensure that libevdev has been updated to the new kernel headers. This may require installing libevdev from git.
• run scripts/keysym-generator.py to add new keysyms. See the --help output for the correct invocation.
• verify that the format for any keys added by this script is correct and that the keys need to be mapped. Where a key code should not get a new define or is already defined otherwise, comment the line.
• file a merge request with the new changes
• notify the xkeyboard-config maintainers that updates are needed

Note that any #define added immediately becomes API. Due diligence is recommended.