XmClipboardCancelCopy — A clipboard function that
    cancels a copy to the clipboard
#include <Xm/CutPaste.h>
int XmClipboardCancelCopy (display, window, item_id)
        Display * display;
        Window  window;
        long    item_id;
(void)
XmClipboardCancelCopy cancels the copy to clipboard that is
    in progress and frees up temporary storage. When a copy is to be performed,
    XmClipboardStartCopy allocates temporary storage for the clipboard
    data. XmClipboardCopy copies the appropriate data into the the
    temporary storage. XmClipboardEndCopy copies the data to the
    clipboard structure and frees up the temporary storage structures. If
    XmClipboardCancelCopy is called, the XmClipboardEndCopy
    function does not have to be called. A call to XmClipboardCancelCopy
    is valid only after a call to XmClipboardStartCopy.
  - display
 
  - Specifies a pointer to the Display structure that was returned in a
      previous call to XOpenDisplay or XtDisplay.
 
  - window
 
  - Specifies a widget's window ID that relates the application window to the
      clipboard. The widget's window ID can be obtained through XtWindow.
      The same application instance should pass the same window ID to each of
      the clipboard functions that it calls.
 
  - item_id
 
  - Specifies the number assigned to this data item. This number was returned
      by a previous call to XmClipboardStartCopy.
 
  - XmClipboardSuccess
 
  - The function was successful.
 
  - XmClipboardLocked
 
  - The function failed because the clipboard was locked by another
      application. The application can continue to call the function again with
      the same parameters until the lock goes away. This gives the application
      the opportunity to ask if the user wants to keep trying or to give up on
      the operation.
 
  - XmClipboardFail
 
  - The function failed because XmClipboardStartCopy was not called or
      because the data item contains too many formats.
 
XmClipboardCopy(3), XmClipboardEndCopy(3), and
    XmClipboardStartCopy(3).