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Add "local" option to specify that the reference clock is an unsynchronized clock which is more stable than the system clock (e.g. TCXO, OCXO, or atomic clock) and it should be used as a local standard to stabilize the system clock. Handle the local refclock as a PPS refclock locked to itself which gives the unsynchronized status to be ignored in the source selection. Wait for the refclock to get at least minsamples samples and adjust the clock directly to follow changes in the refclock's sourcestats frequency and offset. There should be at most one refclock specified with this option.
This is a collection of simulation tests using the clknetsim simulator (supported on Linux only). https://github.com/mlichvar/clknetsim The CLKNETSIM_PATH environment variable should point to the directory where clknetsim was downloaded and compiled. If the variable is not set, the tests will look for clknetsim in ./clknetsim in the current directory. The tests are written in bash and they can be run directly. The ./run script runs all tests.