[PATCH 2/2 v3] adjtimex.2: add explanation on ADJ_TAI mode
From: Laurent Georget <hidden>
Date: 2014-11-30 10:24:56
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the rest · Maintainer:
Linus Torvalds
This patch includes the adjtimex mode ADJ_TAI, intended to update the TAI offset. There are other FIXMEs in the man page and it's a bit outdated. I'll be on it once those first patches are accepted (to be sure to do the right thing). Thanks Laurent
diff --git a/man2/adjtimex.2 b/man2/adjtimex.2
index 0b919c5..396b8cc 100644
--- a/man2/adjtimex.2
+++ b/man2/adjtimex.2@@ -24,9 +24,7 @@ .\" Modified 1997-01-31 by Eric S. Raymond <esr@thyrsus.com> .\" Modified 1997-07-30 by Paul Slootman <paul@wurtel.demon.nl> .\" Modified 2004-05-27 by Michael Kerrisk <mtk.manpages@gmail.com> -.\" -.\" FIXME Document ADJ_TAI (added in Linux 2.6.26) -.\" commit 153b5d054ac2d98ea0d86504884326b6777f683d +.\" Modified 2014-11-30 by Laurent Georget <laurent.georget@supelec.fr> .\" .\" FIXME Document ADJ_MICRO and ADJ_NANO (added in Linux 2.6.26) .\" commit eea83d896e318bda54be2d2770d2c5d6668d11db
@@ -101,6 +99,7 @@ combination of zero or more of the following bits: #define ADJ_ESTERROR 0x0008 /* estimated time error */ #define ADJ_STATUS 0x0010 /* clock status */ #define ADJ_TIMECONST 0x0020 /* pll time constant */ +#define ADJ_TAI 0x0080 /* TAI offset */ #define ADJ_TICK 0x4000 /* tick value */ #define ADJ_OFFSET_SINGLESHOT 0x8001 /* old-fashioned adjtime() */ .fi
@@ -110,6 +109,24 @@ Ordinary users are restricted to a zero value for .IR modes . Only the superuser may set any parameters. .br +In the case of +.BR ADJ_TAI , +as +.I buf->tai +is read-only, the new value is passed through +.IR buf->constant , +therefore +.B ADJ_TIMECONST +and +.B ADJ_TAI +should probably not be used at the same time. +.PP +Support for TAI (Atomic International Time, for a complete explanation
about +what it is and what is the difference between TAI and UTC, see +.UR http://www.bipm.org/en/bipm/tai/tai.html +.I BIPM +.UE ) +has been added in version 2.6.26. .ne 12v .SH RETURN VALUE On success,