The structure for this event type contains:
typedef struct {
int type; /* SelectionRequest */
unsigned long serial; /* # of last request processed by server */
Bool send_event; /* true if this came from a SendEvent request */
Display *display; /* Display the event was read from */
Window owner;
Window requestor;
Atom selection;
Atom target;
Atom property;
Time time;
} XSelectionRequestEvent;
The owner member is set to the window that was specified by the current owner in its XSetSelectionOwner() call. The requestor member is set to the window requesting the selection. The selection member is set to the atom that names the selection. For example, PRIMARY is used to indicate the primary selection. The target member is set to the atom that indicates the type the selection is desired in. The property member can be a property name or None. The time member is set to the timestamp or CurrentTime value from the ConvertSelection request.
The owner should convert the selection based on the specified target type and send a SelectionNotify event back to the requestor. A complete specification for using selections is given in the X Consortium standard Inter-Client Communication Conventions Manual.