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