struct	timex {
	int		modes;	/* mode selector */
	long		offset;	/* time offset (usec) */
	long		freq;	/* frequency offset (scaled ppm) */
	long		maxerror;	/* maximum error (usec) */
	long		esterror;	/* estimated error (usec) */
	int		status;	/* clock command/status */
	long		constant;	/* pll time constant */
	long		precision;	/* clock precision (usec) (read only) */
	long		tolerance;	/* clock frequency tolerance (ppm) (read only) */
	struct timeval		time;	/* current time (read only) */
	long		tick;	/* usecs between clock ticks */
};

#define ADJ_OFFSET            0x0001 /* time offset */
#define ADJ_FREQUENCY         0x0002 /* frequency offset */
#define ADJ_MAXERROR          0x0004 /* maximum time error */
#define ADJ_ESTERROR          0x0008 /* estimated time error */
#define ADJ_STATUS            0x0010 /* clock status */
#define ADJ_TIMECONST         0x0020 /* pll time constant */
#define ADJ_TICK              0x4000 /* tick value */
#define ADJ_OFFSET_SINGLESHOT 0x8001 /* old-fashioned adjtime() */

#define TIME_OK   0 /* clock synchronized */
#define TIME_INS  1 /* insert leap second */
#define TIME_DEL  2 /* delete leap second */
#define TIME_OOP  3 /* leap second in progress */
#define TIME_WAIT 4 /* leap second has occurred */
#define TIME_BAD  5 /* clock not synchronized */