X Window System programmers that use the Xlib API frequently must deal with X protocol error messages. Unfortunately, these error messages refer to X protocol requests, rather than Xlib functions. The following pages correlate the X Window System protocol requests with their corresponding Xlib functions:
These pages use HTML 3.0 tables. If your browser does not support tables, you cannot easily read them; sorry.
These tables can help X Window System programmers debug X protocol error messages. A tutorial on debugging X protocol errors is available here.