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adjtimex.2: Document ADJ_OFFSET_SS_READ 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2014-06-17 17:20:35 +02:00
parent 002d27fb8d
commit 6eaec6b167
1 changed files with 21 additions and 2 deletions
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23
man2/adjtimex.2
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@ -148,8 +148,25 @@ Old-fashioned
.BR adjtime ():
(gradually) adjust time by value specified in
.IR buf.offset .
.TP
.BR ADJ_OFFSET_SS_READ " (functional since Linux 2.6.28)"
.\" In user space, ADJ_OFFSET_SS_READ is 0xa001
.\" In kernel space there is ADJ_OFFSET_READONLY (0x2000) anded with
.\" ADJ_ADJTIME (0x8000) and ADJ_OFFSET_SINGLESHOT (0x0001) to give 0xa001)
Return (in
.BR buf.offset )
the remaining amount of time to be adjusted after an earlier
.BR ADJ_OFFSET_SINGLESHOT
operation.
This feature was added in Linux 2.6.24,
.\" commit 52bfb36050c8529d9031d2c2513b281a360922ec
but did not work correctly
.\" commit 916c7a855174e3b53d182b97a26b2e27a29726a1
until Linux 2.6.28.
.PP
Ordinary users are restricted to a zero value for
Ordinary users are restricted to a value of either 0 or
.B ADJ_OFFSET_SS_READ
for
.IR modes .
Only the superuser may set any parameters.
@ -228,7 +245,9 @@ is the system timer interrupt frequency.
.TP
.B EPERM
.I buf.modes
is nonzero and the caller does not have sufficient privilege.
is neither 0 nor
.BR ADJ_OFFSET_SS_READ ,
and the caller does not have sufficient privilege.
Under Linux the
.B CAP_SYS_TIME
capability is required.