Miroslav Lichvar 39ff7ceeca sys_linux: avoid blocking in reading of external PHC timestamp ...

The kernel has a common queue for all readers of a PHC device. With
multiple PHC refclocks using the same device some reads blocked. PHC
devices don't seem to support non-blocking reads. Use poll() to check if
a timestamp is available before reading from the descriptor.

2023-03-02 15:13:18 +01:00

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