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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 file for the module that keeps track of the current
+  reference.
+
+  */
+
+#ifndef GOT_REFERENCE_H
+#define GOT_REFERENCE_H
+
+#include "sysincl.h"
+
+#include "ntp.h"
+#include "reports.h"
+
+/* Leap second handling modes */
+typedef enum {
+  REF_LeapModeSystem,
+  REF_LeapModeSlew,
+  REF_LeapModeStep,
+  REF_LeapModeIgnore,
+} REF_LeapMode;
+
+/* Init function */
+extern void REF_Initialise(void);
+
+/* Fini function */
+extern void REF_Finalise(void);
+
+typedef enum {
+  REF_ModeNormal,
+  REF_ModeInitStepSlew,
+  REF_ModeUpdateOnce,
+  REF_ModePrintOnce,
+  REF_ModeIgnore,
+} REF_Mode;
+
+/* Set reference update mode */
+extern void REF_SetMode(REF_Mode mode);
+
+/* Get reference update mode */
+extern REF_Mode REF_GetMode(void);
+
+/* Function type for handlers to be called back when mode ends */
+typedef void (*REF_ModeEndHandler)(int result);
+
+/* Set the handler for being notified of mode ending */
+extern void REF_SetModeEndHandler(REF_ModeEndHandler handler);
+
+/* Get leap second handling mode */
+extern REF_LeapMode REF_GetLeapMode(void);
+
+/* Function which takes a local cooked time and returns the estimated
+   time of the reference.  It also returns the other parameters
+   required for forming the outgoing NTP packet.
+
+   local_time is the cooked local time returned by the LCL module
+
+   is_synchronised indicates whether we are synchronised to anything
+   at the moment.
+
+   leap indicates the current leap status
+
+   stratum is the stratum of this machine, when considered to be sync'd to the
+   reference
+   
+   ref_id is the reference_id of the source
+
+   ref_time is the time at which the we last set the reference source up
+
+   root_delay is the root delay of the sample we are using
+
+   root_dispersion is the root dispersion of the sample we are using, with all the
+   skew etc added on.
+
+   */
+
+extern void REF_GetReferenceParams
+(
+ struct timespec *local_time,
+ int *is_synchronised,
+ NTP_Leap *leap,
+ int *stratum,
+ uint32_t *ref_id,
+ struct timespec *ref_time,
+ double *root_delay,
+ double *root_dispersion
+);
+
+/* Function called by the clock selection process to register a new
+   reference source and its parameters
+
+   stratum is the stratum of the reference
+
+   leap is the leap status read from the source
+
+   ref_id is the reference id of the reference
+
+   ref_time is the time at which the parameters are assumed to be
+   correct, in terms of local time
+
+   frequency is the amount of local clock gain relative to the
+   reference per unit time interval of the local clock
+
+   skew is the maximum estimated frequency error (so we are within
+   [frequency+-skew])
+
+   root_delay is the root delay of the sample we are using
+
+   root_dispersion is the root dispersion of the sample we are using
+
+   */
+
+extern void REF_SetReference
+(
+ int stratum,
+ NTP_Leap leap,
+ int combined_sources,
+ uint32_t ref_id,
+ IPAddr *ref_ip,
+ struct timespec *ref_time,
+ double offset,
+ double offset_sd,
+ double frequency,
+ double frequency_sd,
+ double skew,
+ double root_delay,
+ double root_dispersion
+);
+
+extern void REF_SetManualReference
+(
+ struct timespec *ref_time,
+ double offset,
+ double frequency,
+ double skew
+);
+
+/* Mark the local clock as unsynchronised */
+extern void
+REF_SetUnsynchronised(void);
+
+/* Make a small correction of the clock without updating the reference
+   parameters and calling the clock change handlers */
+extern int REF_AdjustReference(double offset, double frequency);
+
+/* Announce a leap second before the full reference update */
+extern void REF_UpdateLeapStatus(NTP_Leap leap);
+
+/* Return the current stratum of this host or 16 if the host is not
+   synchronised */
+extern int REF_GetOurStratum(void);
+
+/* Return stratum of the local reference if orphan mode is enabled */
+extern int REF_GetOrphanStratum(void);
+
+/* Return the current skew */
+extern double REF_GetSkew(void);
+
+/* Modify the setting for the maximum skew we are prepared to allow updates on (in ppm). */
+extern void REF_ModifyMaxupdateskew(double new_max_update_skew);
+
+/* Modify makestep settings */
+extern void REF_ModifyMakestep(int limit, double threshold);
+
+extern void REF_EnableLocal(int stratum, double distance, int orphan);
+extern void REF_DisableLocal(void);
+
+/* Check if either of the current raw and cooked time, and optionally a
+   provided timestamp with an offset, is close to a leap second */
+extern int REF_IsLeapSecondClose(struct timespec *ts, double offset);
+
+/* Return TAI-UTC offset corresponding to a time in UTC if available */
+extern int REF_GetTaiOffset(struct timespec *ts);
+
+extern void REF_GetTrackingReport(RPT_TrackingReport *rep);
+
+#endif /* GOT_REFERENCE_H */