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/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Miroslav Lichvar 2016
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
**********************************************************************
=======================================================================
Header for tracking of hardware clocks */
#ifndef GOT_HWCLOCK_H
#define GOT_HWCLOCK_H
typedef struct HCL_Instance_Record *HCL_Instance;
/* Create a new HW clock instance */
extern HCL_Instance HCL_CreateInstance(int min_samples, int max_samples,
double min_separation, double precision);
/* Destroy a HW clock instance */
extern void HCL_DestroyInstance(HCL_Instance clock);
/* Check if a new sample should be accumulated at this time */
extern int HCL_NeedsNewSample(HCL_Instance clock, struct timespec *now);
/* Process new readings of the HW clock in the form of (sys, hw, sys) triplets
and produce a sample which can be accumulated by HCL_AccumulateSample().
Indicate the quality of the sample relative to already processed samples as
a value of 0, 1, or 2, where a sample of quality 0 should normally be
dropped. */
extern int HCL_ProcessReadings(HCL_Instance clock, int n_readings, struct timespec tss[][3],
struct timespec *hw_ts, struct timespec *local_ts, double *err,
int *quality);
/* Accumulate a new sample */
extern void HCL_AccumulateSample(HCL_Instance clock, struct timespec *hw_ts,
struct timespec *local_ts, double err);
/* Convert raw hardware time to cooked local time */
extern int HCL_CookTime(HCL_Instance clock, struct timespec *raw, struct timespec *cooked,
double *err);
#endif
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