Function xcb_convert_selection 

pub unsafe extern "C" fn xcb_convert_selection(
    c: *mut xcb_connection_t,
    requestor: xcb_window_t,
    selection: xcb_atom_t,
    target: xcb_atom_t,
    property: xcb_atom_t,
    time: xcb_timestamp_t,
) -> xcb_void_cookie_t