[ntp:questions] Using ntpd with custom clock

[David Woolley]

Felipe Blauth wrote:
> 
> I'd like to build a custom version of ntpd with a single change: instead
> of synchronizing with operating system clock, it would synchronize with a

Synchronise with, or just synchronise?

If the former, then it is just another reference clock driver.  If the 
latter, I believe the source code tries to abstract the OS kernel 
interface, and the file that does that should be fairly obvious, on 
inspection.

Please note that the higher precision parts of the software clock 
synchronisation are done in the kernel.  If you don't use that 
interface, ntpd will only correct the clock frequency once a second.