From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laurent Georget Subject: [PATCH 2/2 v3] adjtimex.2: add explanation on ADJ_TAI mode Date: Sun, 30 Nov 2014 11:14:49 +0100 Message-ID: <547AEE19.4040901@supelec.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: "Michael Kerrisk (man-pages)" , linux-man Cc: linux-kernel@vger.kernel.org List-Id: linux-man@vger.kernel.org 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 There are other FIXMEs in the man page and it's a bit outdated.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 .\" Modified 1997-07-30 by Paul Slootman .\" Modified 2004-05-27 by Michael Kerrisk -.\" -.\" FIXME Document ADJ_TAI (added in Linux 2.6.26) -.\" commit 153b5d054ac2d98ea0d86504884326b6777f683d +.\" Modified 2014-11-30 by Laurent Georget .\" .\" 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,