ho_close
static void ho_close(struct irs_ho *this);
ho->close = ho_close;
static void ho_close(struct irs_ho *this);
ho->close = ho_close;
ho->close = ho_close;
static void ho_close(struct irs_ho *this);
static void ho_close(struct irs_ho *this);
ho->close = ho_close;