I am looking at the shared memory structure and code used by NTP and was
wondering if I could get some guidance on these values. The big question is
how NTP uses the clockTime vs the receiveTime.
Trying to also understand the unit (unitptr) concept and which shared memory
location(s) I should use if I have just a single time source.
I also do not see a big difference between mode 0 and 1 especially given the
valid field, but maybe someone could shed light on those. I gather precision
is not used?
struct shmTime {
int mode; /* 0 - if valid set
* use values,
* clear valid
* 1 - if valid set
* if count before and after read of values is equal,
* use values
* clear valid
*/
int count;
time_t clockTimeStampSec;
int clockTimeStampUSec;
time_t receiveTimeStampSec;
int receiveTimeStampUSec;
int leap;
int precision;
int nsamples;
int valid;
int dummy[10];
};
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