X Protocol Event and Error Codes

These tables list the names and codes for the X Window Systems protocol's events and errors. Brief descriptions of the error conditions are also provided. Tables listing X protocol request names and codes are also available.

These tables should help X Window System programmers debug X protocol error messages. A tutorial on debugging X protocol errors is available separately.

X Events Event Name Code KeyPress 2 KeyRelease 3 ButtonPress 4 ButtonRelease 5 MotionNotify 6 EnterNotify 7 LeaveNotify 8 FocusIn 9 FocusOut 10 KeymapNotify 11 Expose 12 GraphicsExpose 13 NoExpose 14 VisibilityNotify 15 CreateNotify 16 DestroyNotify 17 UnmapNotify 18 MapNotify 19 MapRequest 20 ReparentNotify 21 ConfigureNotify 22 ConfigureRequest 23 GravityNotify 24 ResizeRequest 25 CirculateNotify 26 CirculateRequest 27 PropertyNotify 28 SelectionClear 29 SelectionRequest 30 SelectionNotify 31 ColormapNotify 32 ClientMessage 33 MappingNotify 34

X Errors Error Name Code Reason Success 0 everything's okay BadRequest 1 bad request code BadValue 2 int parameter out of range BadWindow 3 parameter not a Window BadPixmap 4 parameter not a Pixmap BadAtom 5 parameter not an Atom BadCursor 6 parameter not a Cursor BadFont 7 parameter not a Font BadMatch 8 parameter mismatch BadDrawable 9 parameter not a Pixmap or Window BadAccess 10 depending on context: key/button already grabbed attempt to free an illegal cmap entry attempt to store into a read-only color map entry attempt to modify the access control list from other than the local host BadAlloc 11 insufficient resources BadColor 12 no such colormap BadGC 13 parameter not a GC BadIDChoice 14 choice not in range or already used BadName 15 font or color name doesn't exist BadLength 16 request length incorrect BadImplementation 17 server is defective