XGetErrorText(display, code, buffer_return, length)
      Display *display;
      int code;
      char *buffer_return;
      int length;
| display | Specifies the connection to the X server. | 
| code | Specifies the error code for which you want to obtain a description. | 
| buffer_return | Returns the error description. | 
| length | Specifies the size of the buffer. |