Fields
- modes: u32
- offset: s64
- freq: s64
- maxerror: s64
- esterror: s64
- status: s32
- constant: s64
- precision: s64
- tolerance: s64
- time: timeval
- tick: s64
- ppsfreq: s64
- jitter: s64
- shift: s32
- stabil: s64
- jitcnt: s64
- calcnt: s64
- errcnt: s64
- stbcnt: s64
- tai: s32
- __bitfield: [44] u8