adjtimex -- tune kernel clock


#include <sys/timex.h>

int adjtimex(struct timex *buf);


Linux uses David L. Mills' clock adjustment algorithm (see RFC 1305). The system call adjtimex reads and optionally sets adjustment parameters for this algorithm. It takes a pointer to a timex structure, updates kernel parameters from field values, and returns the same structure with current kernel values. This structure is declared as follows:

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 */


The modes field determines which parameters, if any, to set. It may contain a bitwise-or combination of zero or more of the following bits:

#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 */

Ordinary users are restricted to a zero value for mode. Only the superuser may set any parameters.

Return Value

On success, adjtimex returns the clock state:

#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 */

On error, -1 is returned, and errno is set appropriately.



buf does not point to writable memory.


buf.mode is non-zero and the user is not super-user.


An attempt is made to set buf.offset to a value outside the range -131071 to +131071, or to set buf.status to a value other than those listed above, or to set buf.tick to a value outside the range 900000/HZ to 1100000/HZ, where HZ is the system timer interrupt frequency.