[chrony-users] /dev/pps0 not being blocked? Magic?!

["Tomalak Geret'kal" <tom@xxxxxxxxx>]

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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