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/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Richard P. Curnow 1997-2002
* Copyright (C) Miroslav Lichvar 2014
*
* 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.
*
**********************************************************************
=======================================================================
This is the header for the module that manages the collection of all
sources that we are making measurements from. This include all NTP
servers & peers, locally connected reference sources, eye/wristwatch
drivers etc */
#ifndef GOT_SOURCES_H
#define GOT_SOURCES_H
#include "sysincl.h"
#include "ntp.h"
#include "reports.h"
#include "sourcestats.h"
/* Size of the source reachability register */
#define SOURCE_REACH_BITS 8
/* This datatype is used to hold information about sources. The
instance must be passed when calling many of the interface
functions */
typedef struct SRC_Instance_Record *SRC_Instance;
/* Initialisation function */
extern void SRC_Initialise(void);
/* Finalisation function */
extern void SRC_Finalise(void);
typedef enum {
SRC_NTP, /* NTP client/peer */
SRC_REFCLOCK /* Rerefence clock */
} SRC_Type;
/* Function to create a new instance. This would be called by one of
the individual source-type instance creation routines. */
extern SRC_Instance SRC_CreateNewInstance(uint32_t ref_id, SRC_Type type, int sel_options,
IPAddr *addr, int min_samples, int max_samples,
double min_delay, double asymmetry);
/* Function to get rid of a source when it is being unconfigured.
This may cause the current reference source to be reselected, if this
was the reference source or contributed significantly to a
falseticker decision. */
extern void SRC_DestroyInstance(SRC_Instance instance);
/* Function to reset a source */
extern void SRC_ResetInstance(SRC_Instance instance);
/* Function to change the sources's reference ID and IP address */
extern void SRC_SetRefid(SRC_Instance instance, uint32_t ref_id, IPAddr *addr);
/* Function to get access to the sourcestats instance */
extern SST_Stats SRC_GetSourcestats(SRC_Instance instance);
/* This function is called by one of the source drivers when it has
a new sample that is to be accumulated */
extern void SRC_AccumulateSample(SRC_Instance instance, NTP_Sample *sample);
/* This routine sets the source as receiving reachability updates */
extern void SRC_SetActive(SRC_Instance inst);
/* This routine sets the source as not receiving reachability updates */
extern void SRC_UnsetActive(SRC_Instance inst);
/* This routine updates the reachability register */
extern void SRC_UpdateReachability(SRC_Instance inst, int reachable);
/* This routine marks the source unreachable */
extern void SRC_ResetReachability(SRC_Instance inst);
/* This routine is used to select the best source from amongst those
we currently have valid data on, and use it as the tracking base
for the local time. Updates are made to the local reference only
when the selected source was updated (set as updated_inst) since
the last reference update. This avoids updating the frequency
tracking for every sample from other sources - only the ones from
the selected reference make a difference. */
extern void SRC_SelectSource(SRC_Instance updated_inst);
/* Force reselecting the best source */
extern void SRC_ReselectSource(void);
/* Set reselect distance */
extern void SRC_SetReselectDistance(double distance);
extern void SRC_DumpSources(void);
extern void SRC_ReloadSources(void);
extern void SRC_RemoveDumpFiles(void);
extern int SRC_IsSyncPeer(SRC_Instance inst);
extern int SRC_IsReachable(SRC_Instance inst);
extern int SRC_ReadNumberOfSources(void);
extern int SRC_ActiveSources(void);
extern int SRC_ReportSource(int index, RPT_SourceReport *report, struct timespec *now);
extern int SRC_ReportSourcestats(int index, RPT_SourcestatsReport *report, struct timespec *now);
extern SRC_Type SRC_GetType(int index);
#endif /* GOT_SOURCES_H */
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