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ADJFREQ(2) System Calls Manual ADJFREQ(2)

NAME

adjfreqcorrect 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.

SEE ALSO

date(1), adjtime(2), gettimeofday(2), ntpd(8)

HISTORY

The adjfreq() function call first appeared in OpenBSD 4.0.
September 10, 2015 OpenBSD-current