#include <linux/dvb/frontend.h>


  struct dtv_property prop [] = {
{ .cmd = DTV_DELIVERY_SYSTEM,   .u.data = SYS_DVBS2 }, /* Select DVB-S2 */
{ .cmd = DTV_FREQUENCY,         .u.data = frequency }, /* Set frequency */
{ .cmd = DTV_SYMBOL_RATE,       .u.data = srate },     /* Set symbol rate */
{ .cmd = DTV_TUNE },  /* now actually tune to that frequency (no parameters needed) */
};


  struct dtv_properties props = {
.num = 4, /* The number of commands in the array */
.props = prop /* Pointer to the array */
};


if ((ioctl(myfd, FE_SET_PROPERTY, &props)) == -1) {
    perror("FE_SET_PROPERTY failed");
  }

typedef struct vtuner_message {
__s32 type;
union {
fe_delivery_system_t system;
	struct {
             	__u32   frequency;
             	__u8	inversion;
			union {
				struct {
					__u32	symbol_rate;
					__u32	fec_inner;
				} qpsk;
				struct {
					__u32   symbol_rate;
					__u32   fec_inner;
					__u32	modulation;
				} qam;
				struct {
					__u32	bandwidth;
					__u32	code_rate_HP;
					__u32	code_rate_LP;
					__u32	constellation;
					__u32	transmission_mode;
					__u32	guard_interval;
					__u32	hierarchy_information;
				} ofdm;
				struct {
					__u32	modulation;
				} vsb;
			} u;
		} fe_params;
		struct dtv_property prop;
            	__u32 status;
            	__u32 ber;
            	__u16 ss, snr;
            	__u32 ucb;
            	__u8 tone;
            	__u8 voltage;
		diseqc_master_cmd_t diseqc_master_cmd;
            	__u8 burst;
            	__u16 pidlist[30];
            	__u8  pad[72];
		__u32 type_changed;
    	} body;
} vtuner_message_t;