#define NFF 5structtermiox{__u16x_hflag;__u16x_cflag;__u16x_rflag[NFF];__u16x_sflag;};#define RTSXOFF 0x0001 /* RTS flow control on input */#define CTSXON 0x0002 /* CTS flow control on output */#define DTRXOFF 0x0004 /* DTR flow control on input */#define DSRXON 0x0008 /* DCD flow control on output */