Manual Pages for UNIX Operating System command usage for man ntp_adjtime

System Calls                                       ntp_adjtime(2)



NAME
     ntp_adjtime - adjust local clock parameters

SYNOPSIS
     #include 

     int ntp_adjtime(struct timex *tptr);


DESCRIPTION
     The ntp_adjtime() function adjusts the  parameters  used  to
     discipline  the  local clock, according to the values in the
     struct timex pointed to by  tptr. Before returning, it fills
     in  the  structure  with  the most recent values kept in the
     kernel.


     The adjustment is effected in part by speeding up or slowing
     down  the  clock, as necessary, and in part by phase-locking
     onto a once-per second pulse (PPS) provided by a driver,  if
     available.

       struct timex {
           uint32_t modes;        /* clock mode bits (w) */
           int32_t  offset;       /* time offset (us) (rw) */
           int32_t  freq;         /* frequency offset (scaled ppm) (rw) */
           int32_t  maxerror;     /* maximum error (us) (rw) */
           int32_t  esterror;     /* estimated error (us) (rw) */
           int32_t  status;       /* clock status bits (rw) */
           int32_t  constant;     /* pll time constant (rw) */
           int32_t  precision;    /* clock precision (us) (r) */
           int32_t  tolerance;    /* clock frequency tolerance
                                     (scaled ppm) (r) */
           int32_t  ppsfreq;      /* pps frequency (scaled ppm) (r) */
           int32_t  jitter;       /* pps jitter (us) (r) */
           int32_t  shift;        /* interval duration (s) (shift) (r) */
           int32_t  stabil;       /* pps stability (scaled ppm) (r) */
           int32_t  jitcnt;       /* jitter limit exceeded (r) */
           int32_t  calcnt;       /* calibration intervals (r) */
           int32_t  errcnt;       /* calibration errors (r) */
           int32_t  stbcnt;       /* stability limit exceeded (r) */
       };


RETURN VALUES
     Upon  successful  completion,  ntp_adjtime()   returns   the
     current  clock  state  (see  ).  Otherwise,  it
     returns -1 and sets errno to indicate the error.

ERRORS
     The ntp_adjtime() function will fail if:




SunOS 5.11          Last change: 21 May 2009                    1






System Calls                                       ntp_adjtime(2)



     EFAULT    The  tptr argument is an invalid pointer.


     EINVAL    The constant member of the structure pointed to by
               tptr is less than 0 or greater than 30.


     EPERM     The {PRIV_SYS_TIME} privilege is not  asserted  in
               the effective set of the calling process.


SEE ALSO
     ntp_gettime(2), privileges(5)


     See the ntpd man page, delivered  in  the  SUNWntpu  package
     (not a SunOS man page).






































SunOS 5.11          Last change: 21 May 2009                    2