linux-kernel - [PATCH] adjtimex.2: Add details about ADJ

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Message-ID: <54A2DEAD.2050708@supelec.fr>
Date:	Tue, 30 Dec 2014 18:19:41 +0100
From:	Laurent Georget <laurent.georget@...elec.fr>
To:	linux-man <linux-man@...r.kernel.org>
CC:	linux-kernel@...r.kernel.org
Subject: [PATCH] adjtimex.2: Add details about ADJ_FREQUENCY

Hi,

this is another patch for adjtimex(2) man page which fixes a FIXME by
giving the scaling unit of timex.freq and adds a detail about the value
expected by ADJ_FREQUENCY.

Laurent

diff --git a/man2/adjtimex.2 b/man2/adjtimex.2
index 18823c8..2652fc6 100644
--- a/man2/adjtimex.2
+++ b/man2/adjtimex.2
@@ -55,8 +55,8 @@ struct timex {
                          status flag is set, otherwise
                          microseconds */
     long freq;        /* Frequency offset, as scaled PPM
-                         (parts per million) */
-.\" FIXME What is the scaling unit of timex.freq?  2^16 ?
+                         (parts per million) :
+                         the scaling unit of timex.freq is 2^16 usec =
1000*2^16 nsec.
     long maxerror;    /* Maximum error (microseconds) */
     long esterror;    /* Estimated error (microseconds) */
     int  status;      /* Clock command/status */
@@ -106,6 +106,10 @@ Set time offset from
 .BR ADJ_FREQUENCY
 Set frequency offset from
 .IR buf.freq .
+The clock frequency must be comprised between -500000 and 500000 scaled
ns/s.
+If the given value is outside those bounds, it is silently truncated. This
+corresponds to values between -32768000 and 32768000 for
+.IR buf.freq .
 .TP
 .BR ADJ_MAXERROR
 Set maximum time error from


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