fefd5b4b05
When synchronizing the system clock and the PTP UTC offset is valid and traceable, set the TAI offset of the clock to have correct CLOCK_TAI (which is implemented in the kernel as CLOCK_REALTIME + TAI offset). Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/**
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* @file clockadj.h
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* @brief Wraps clock_adjtime functionality.
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* @note Copyright (C) 2013 Miroslav Lichvar <mlichvar@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef HAVE_CLOCKADJ_H
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#define HAVE_CLOCKADJ_H
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#include <inttypes.h>
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#include <time.h>
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/**
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* Initialize state needed when adjusting or reading the clock.
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* @param clkid A clock ID obtained using phc_open() or CLOCK_REALTIME.
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*/
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void clockadj_init(clockid_t clkid);
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/**
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* Set clock's frequency offset.
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* @param clkid A clock ID obtained using phc_open() or CLOCK_REALTIME.
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* @param freq The frequency offset in parts per billion (ppb).
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*/
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void clockadj_set_freq(clockid_t clkid, double freq);
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/**
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* Read clock's frequency offset.
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* @param clkid A clock ID obtained using phc_open() or CLOCK_REALTIME.
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* @return The frequency offset in parts per billion (ppb).
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*/
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double clockadj_get_freq(clockid_t clkid);
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/**
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* Step clock's time.
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* @param clkid A clock ID obtained using phc_open() or CLOCK_REALTIME.
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* @param step The time step in nanoseconds.
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*/
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void clockadj_step(clockid_t clkid, int64_t step);
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/**
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* Set the system clock to insert/delete leap second at midnight.
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* @param leap +1 to insert leap second, -1 to delete leap second,
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* 0 to reset the leap state.
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*/
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void sysclk_set_leap(int leap);
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/**
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* Set the TAI offset of the system clock to have correct CLOCK_TAI.
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* @param offset The TAI-UTC offset in seconds.
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*/
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void sysclk_set_tai_offset(int offset);
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/**
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* Read maximum frequency adjustment of the system clock (CLOCK_REALTIME).
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* @return The maximum frequency adjustment in parts per billion (ppb).
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*/
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int sysclk_max_freq(void);
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/**
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* Mark the system clock as synchronized to let the kernel synchronize
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* the real-time clock (RTC) to it.
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*/
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void sysclk_set_sync(void);
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#endif
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