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sys_macosx: add support for ntp_adjtime() on macOS 10.13+

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macOS 10.13 will implement the ntp_adjtime() system call, allowing
better control over the system clock than is possible with the existing
adjtime() system call. chronyd will support both the older and newer
calls, enabling binary code to run without recompilation on macOS 10.9
through macOS 10.13.

Early releases of macOS 10.13 have a very buggy adjtime() call. The
macOS driver tests adjtime() to see if the bug has been fixed. If the
bug persists then the timex driver is invoked otherwise the netbsd
driver.
This commit is contained in:
Bryan Christianson
2017-07-13 12:18:02 +12:00
committed by Miroslav Lichvar
parent 778fce4039
commit ccb94ac5fb
5 changed files with 109 additions and 22 deletions
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4
doc/chronyd.adoc
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@@ -87,8 +87,8 @@ histories are created by using the <<chronyc.adoc#dump,*dump*>> command in
directive in the configuration file. This option is useful if you want to stop
and restart *chronyd* briefly for any reason, e.g. to install a new version.
However, it should be used only on systems where the kernel can maintain clock
compensation whilst not under *chronyd*'s control (i.e. Linux, FreeBSD, NetBSD
and Solaris).
compensation whilst not under *chronyd*'s control (i.e. Linux, FreeBSD, NetBSD,
Solaris, and macOS 10.13 or later).
*-R*::
When this option is used, the <<chrony.conf.adoc#initstepslew,*initstepslew*>>