[LEAPSECS] Time math libraries, UTC to TAI

[John Sauter]

On Wed, 2017-01-04 at 21:58 -0700, Warner Losh wrote:

> But keeping the kernel time in TAI and reporting it in UTC still
> doesn't solve the userland side of things because time goes backwards
> across the leap second... If everything were in TAI and it was just a
> conversion, then some math with time breaks.
> 
When the kernel reports time in UTC, it adds 1e9 to the nanoseconds
field of a timeval to indicate that a leap second is in progress. 
Thus, a properly-interpreted timeval never runs backwards.
    John Sauter (John_Sauter at systemeyescomputerstore.com)

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