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Command: hardclock | Section: 9 | Source: OpenBSD | File: hardclock.9
HARDCLOCK(9) FreeBSD Kernel Developer's Manual HARDCLOCK(9)
NAME
hardclock - real-time system clock
SYNOPSIS
#include <sys/systm.h>
void
hardclock(struct clockframe *frame);
DESCRIPTION
hardclock() implements the real-time system clock, interrupting hz(9)
times a second. The argument frame is an opaque, machine dependent
structure that encapsulates the previous machine state.
hardclock() performs a variety of time related housekeeping tasks, such
as:
o If the current process has virtual or profiling interval
timers, update the timers and deliver appropriate signals.
o If there is no separate statistics clock, execute statclock().
o Increment the time of day, implementing any adjustments
requested by adjtime(2) or required as a result of running an
NTP daemon or other configured external clock.
o Update the real-time timeout queue, calling softclock()
directly if the current interrupt priority is low enough.
CODE REFERENCES
hardclock() is implemented in the file sys/kern/kern_clock.c.
SEE ALSO
adjtime(2), hz(9), microtime(9), spl(9), timeout(9)
FreeBSD 14.1-RELEASE-p8 June 26, 2020 FreeBSD 14.1-RELEASE-p8