XChangeActivePointerGrab(display, event_mask, cursor, time)
      Display *display;
      unsigned int event_mask;
      Cursor cursor;
      Time time;
| display | Specifies the connection to the X server. | 
| event_mask | Specifies which pointer events are reported to the client. The mask is the bitwise inclusive OR of the valid pointer event mask bits. | 
| cursor | Specifies the cursor that is to be displayed or None. | 
| time | Specifies the time. You can pass either a timestamp or CurrentTime. | 
XChangeActivePointerGrab() can generate BadCursor and BadValue errors.
| BadCursor | A value for a Cursor argument does not name a defined Cursor. | 
| BadValue | Some numeric value falls outside the range of values accepted by the request. Unless a specific range is specified for an argument, the full range defined by the argument's type is accepted. Any argument defined as a set of alternatives can generate this error. |