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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 effec- tive 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 13.0 July 9, 2020 FreeBSD 13.0
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY
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