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       XErrorEvent - X error event structure


       The XErrorEvent structure contains:

       typedef struct {
               int type;
               Display *display;       /* Display the event was read from */
               XID resourceid;         /* resource id */
               unsigned long serial;           /* serial number of failed request */
               unsigned char error_code;       /* error code of failed request */
               unsigned char request_code;     /* Major op-code of failed request */
               unsigned char minor_code;       /* Minor op-code of failed request */
       } XErrorEvent;

       When you receive this event, the structure members are set as follows.

       The  serial  member  is  the  number of requests, starting from one, sent over the network
       connection since it was opened.  It is the  number  that  was  the  value  of  NextRequest
       immediately  before  the  failing  call  was  made.  The request_code member is a protocol
       request of the procedure that failed, as defined in


       AllPlanes(3), XAnyEvent(3),  XButtonEvent(3),  XCreateWindowEvent(3),  XCirculateEvent(3),
       XCirculateRequestEvent(3),              XColormapEvent(3),             XConfigureEvent(3),
       XConfigureRequestEvent(3),  XCrossingEvent(3),  XDestroyWindowEvent(3),   XExposeEvent(3),
       XFocusChangeEvent(3),    XGraphicsExposeEvent(3),    XGravityEvent(3),    XKeymapEvent(3),
       XMapEvent(3),       XMapRequestEvent(3),       XPropertyEvent(3),       XReparentEvent(3),
       XResizeRequestEvent(3),            XSelectionClearEvent(3),            XSelectionEvent(3),
       XSelectionRequestEvent(3), XUnmapEvent(3), XVisibilityEvent(3)
       Xlib - C Language X Interface