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Command: adjfreq | Section: 2 | Source: OpenBSD | File: adjfreq.2
ADJFREQ(2) FreeBSD System Calls Manual ADJFREQ(2)
NAME
adjfreq - correct the rate of the system clock
SYNOPSIS
#include <sys/types.h>
#include <sys/time.h>
int
adjfreq(const int64_t *freq, int64_t *oldfreq);
DESCRIPTION
adjfreq() adjusts the rate in which time progresses if freq is non-null.
The unit of the rate of adjustment is nanoseconds per second, shifted
left 32 bits to allow for fractional values.
If oldfreq is non-null, the current value is returned.
Only the superuser may adjust the frequency.
RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the
value -1 is returned and the global variable errno is set to indicate the
error.
ERRORS
adjfreq() will fail if:
[EFAULT] Either of the arguments point outside the process's
allocated address space.
[EPERM] The freq argument is non-null and the process's
effective user ID is not that of the superuser.
[EINVAL] freq is less than -500000 ppm or greater than 500000
ppm.
SEE ALSO
date(1), adjtime(2), gettimeofday(2), ntpd(8)
HISTORY
The adjfreq() function call first appeared in OpenBSD 4.0.
FreeBSD 14.1-RELEASE-p8 July 9, 2020 FreeBSD 14.1-RELEASE-p8