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Over the past few days, some of our readers have informed us that they have run into Linux kernels with real-time clock functionality.
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Real time clock in Linux Here’s how a battery-powered clock works, keeping time when the system just turned off. The second clock is called a sort of “system/clock clock” or “kernel clock” and is therefore controlled by the operating system. On startup, the hardware wall clock is read and used to set the system clock.
When Linux developers talk about “real time clock” they probably mean it.something that keeps track of time on a wall clock and is powered by a battery, i.e.also works when system power is off. These hours are sometimes not respectedlocal time zone and daylight saving time – unless he or she is in dual bootB. with MS Windows, but must also be consistent with world time(UTC, formerly Greenwich Mean Time).
Precious non-PC hardware usually only depends on seconds, such as time(2).System call check, but RTC also show time usage very oftenaccording to the Gregorian calendar and twenty-four hour time, as reported by gmtime(3).
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Linux has two families of widely compatible userspace RTC APIs.know to help you:
