Miroslav Lichvar d66b2f2b24 rtc: handle RTCs that don't support interrupts ...

Some RTCs supported by the Linux kernel don't support the RTC_UIE_ON/OFF
ioctls, which causes chronyd started with the -s option to get stuck in
the initial RTC mode.

After opening the RTC device in the initialization, return error if
the ioctls are not supported to prevent the upper layer from calling the
time_init() function and expecting it to finish.

2019-12-10 17:45:28 +01:00

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