XSaveContext 3X11 __xorgversion__ XLIB FUNCTIONS XSaveContext XFindContext XDeleteContext XUniqueContext associative look-up routines int XSaveContext( Display *display , XID rid , XContext context , XPointer data ); int XFindContext( Display *display , XID rid , XContext context , XPointer *data_return ); int XDeleteContext( Display *display , XID rid, XContext context); XContext XUniqueContext(void); context Specifies the context type to which the data belongs. data Specifies the data to be associated with the window and type. data_return Returns the data. display Specifies the connection to the X server. rid Specifies the resource ID with which the data is associated. If an entry with the specified resource ID and type already exists,  XSaveContext  overrides it with the specified context. The  XSaveContext  function returns a nonzero error code if an error has occurred and zero otherwise. Possible errors are  XCNOMEM  (out of memory). Because it is a return value, the data is a pointer. The  XFindContext  function returns a nonzero error code if an error has occurred and zero otherwise. Possible errors are  XCNOENT  (context-not-found). The  XDeleteContext  function deletes the entry for the given resource ID and type from the data structure. This function returns the same error codes that  XFindContext  returns if called with the same arguments.  XDeleteContext  does not free the data whose address was saved. The  XUniqueContext  function creates a unique context type that may be used in subsequent calls to  XSaveContext . Xlib - C Language X Interface