Me again...
If chrony is tracking /dev/pps0 as a refclock, does it keep
this device open persistently? Or does it close and re-open
it for every poll? Reason I ask is that a separate process
is seemingly still able to `open("/dev/pps0", O_ACCMODE)`
and even block on pulses with `ioctl` whilst chrony is
tracking the same source. Even if locks are not being used
in one or both processes, I'm concerned that under certain
conditions one could starve the other of data? Or is my
understanding of this LinuxPPS device incorrect?
Thanks
Tom
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