ntp_adjtime

Performs NTP discipline adjustments on the system clock.

Prototype

int ntp_adjtime(struct timex *tp);

Returns: int

Arguments

Name	Type	Dir	Description
tp	struct timex	-

Version history

XNU tag	macOS	#
xnu-4570.1.46	macOS 10.13 High Sierra	527
xnu-4903.221.2	macOS 10.14 Mojave	527
xnu-6153.11.26	macOS 10.15 Catalina	527
xnu-7195.50.7.100.1	macOS 11.0 Big Sur	527
xnu-8019.41.5	macOS 12.0 Monterey	527
xnu-8792.41.9	macOS 13.0 Ventura	527
xnu-10002.1.13	macOS 14.0 Sonoma	527
xnu-11215.1.10	macOS 15.0 Sequoia	527
xnu-11417.101.15	macOS 15.4 Sequoia	527
xnu-12377.1.9	macOS 26.0 Tahoe	527
xnu-10002.41.9	—	527
xnu-10002.61.3	—	527
xnu-10002.81.5	—	527
xnu-10063.101.15	—	527
xnu-10063.121.3	—	527
xnu-10063.141.1	—	527
xnu-11215.41.3	—	527
xnu-11215.61.5	—	527
xnu-11215.81.4	—	527
xnu-11417.121.6	—	527
xnu-11417.140.69	—	527
xnu-12377.101.15	—	527
xnu-12377.41.6	—	527
xnu-12377.61.12	—	527
xnu-12377.81.4	—	527
xnu-4570.20.62	—	527
xnu-4570.31.3	—	527
xnu-4570.41.2	—	527
xnu-4570.51.1	—	527
xnu-4570.61.1	—	527
xnu-4570.71.2	—	527
xnu-4903.231.4	—	527
xnu-4903.241.1	—	527
xnu-4903.270.47	—	527
xnu-6153.101.6	—	527
xnu-6153.121.1	—	527
xnu-6153.141.1	—	527
xnu-6153.41.3	—	527
xnu-6153.61.1	—	527
xnu-6153.81.5	—	527
xnu-7195.101.1	—	527
xnu-7195.121.3	—	527
xnu-7195.141.2	—	527
xnu-7195.60.75	—	527
xnu-7195.81.3	—	527
xnu-8019.61.5	—	527
xnu-8019.80.24	—	527
xnu-8020.101.4	—	527
xnu-8020.121.3	—	527
xnu-8020.140.41	—	527
xnu-8792.61.2	—	527
xnu-8792.81.2	—	527
xnu-8796.101.5	—	527
xnu-8796.121.2	—	527
xnu-8796.141.3	—	527

Notes

Implements the kernel side of the NTP PLL/FLL discipline (RFC 5905 Appendix A.5). Lets a privileged userland NTP daemon nudge frequency and offset within bounded ranges and reports clock status (sync state, leap-second pending). On macOS, timed is the principal client.

Related APIs

ntp_gettimeadjtimesettimeofdaygettimeofday