#TIMEX ATOMIC TIME INSTRUCTION MANUAL HOW TO#
#TIMEX ATOMIC TIME INSTRUCTION MANUAL MANUAL#

Like adjtimex() but takes an additional clk_id argument to The clock_adjtime() system call (added in Linux 2.6.39) behaves Mode (0 = Phase Locked Loop, 1 = Frequency Locked Loop).Д¬lock source (0 = A, 1 = B) currently unused.ДЄttempts to set read-only status bits are silently ignored. Resolution (0 = microsecond, 1 = nanoseconds). This flag prevents the small frequency adjustment fromД«eing made when correcting for an ADJ_OFFSET value.ДЄ valid PPS (pulse-per-second) signal is present. Small frequency adjustments will accumulate to fix the Offsets in the same direction are made repeatedly, the So a single call corrects the current offset, but as Result in dampened frequency adjustments also being made. Leap second deletion will occur each day, so long as this Leap-second insertion will occur each day, so long as thisДelete a leap second at the last second of the UTC day. Thus extending the last minute of the day by one second. Insert a leap second after the last second of the UTC day, Some bits in the mask are both readable and settable, whileД®nable phase-locked loop (PLL) updates via ADJ_OFFSET.Д®nable PPS (pulse-per-second) frequency discipline. Retrieve status bits associated with the NTP implementation. The buf.status field is a bit mask that is used to set and/or Ordinary users are restricted to a value of either 0 orДЄDJ_OFFSET_SS_READ for modes. This feature was added in Linux 2.6.24, but did not work Return (in buf.offset) the remaining amount of time to beДЄdjusted after an earlier ADJ_OFFSET_SINGLESHOT operation. Specified in buf.offset, which specifies an adjustment inДЄDJ_OFFSET_SS_READ (functional since Linux 2.6.28) Old-fashioned adjtime(3): (gradually) adjust time by value (multibit mask) values, in which case other bits should not be

Set TAI (Atomic International Time) offset fromДЄDJ_TAI should not be used in conjunction withДЄDJ_TIMECONST, since the latter mode also employs theДЇor a complete explanation of TAI and the differenceДЄlternatively, modes can be specified as either of the following

#TIMEX ATOMIC TIME INSTRUCTION MANUAL HOW TO#

The following example shows how to normalize a timeval The field _usec must always be nonnegative. The value of buf.time is the sum of its two fields, but The ADJ_NANO flag, then _usec is interpreted asДЄ nanosecond value otherwise it is interpreted as Status flag (see below) is clear, the kernel adds 4 toДЄdd buf.time to the current time. Set estimated time error from buf.esterror. Set maximum time error from buf.maxerror. In older kernels, an EINVAL error occurs if The supplied value is clamped to the range (-32768000, Older kernels, an EINVAL error occurs if the supplied Supplied value is clamped to the range (-0.5s, +0.5s). Mask containing a bitwise- or combination of zero or more of the Ntp_adjtime() are equivalent but differently named.) It is a bit (AsДescribed later in this page, the constants used for The modes field determines which parameters, if any, to set. * Further padding bytes to allow for future expansion */ Int tai /* TAI offset, as set by previous ADJ_TAI Long stbcnt /* PPS count of stability limit exceeded Long errcnt /* PPS count of calibration errors Long calcnt /* PPS count of calibration intervals Long jitcnt /* PPS count of jitter limit exceeded Long stabil /* PPS stability (read-only) Long jitter /* PPS jitter (read-only) nanoseconds, if Long ppsfreq /* PPS (pulse per second) frequency Long tick /* Microseconds between clock ticks */

Long tolerance /* Clock frequency tolerance (read-only) ДЄDJ_SETOFFSET) upon return, _usec Long constant /* PLL (phase-locked loop) time constant */ Long esterror /* Estimated error (microseconds) */ Long maxerror /* Maximum error (microseconds) */ Long freq /* Frequency offset see NOTES for units */ Long offset /* Time offset nanoseconds, if STA_NANO It takes a pointer toДЄ timex structure, updates kernel parameters from (selected)ДЇield values, and returns the same structure updated with theД¬urrent kernel values. The system call adjtimex() reads and optionally setsДЄdjustment parameters for this algorithm. SYNOPSIS top #include int adjtimex(struct timex * buf ) int clock_adjtime(clockid_t clk_id, struct timex * buf ) int ntp_adjtime(struct timex * buf ) DESCRIPTION top

#TIMEX ATOMIC TIME INSTRUCTION MANUAL MANUAL#

ADJTIMEX(2) Linux Programmer's Manual ADJTIMEX(2) NAME topДЄdjtimex, clock_adjtime, ntp_adjtime - tune kernel clock

Timex atomic time instruction manual