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diff --git a/refclock.h b/refclock.h
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+/*
+ chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Miroslav Lichvar 2009
+ *
+ * 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 file for refclocks.
+
+ */
+
+#ifndef GOT_REFCLOCK_H
+#define GOT_REFCLOCK_H
+
+#include "srcparams.h"
+#include "sources.h"
+
+typedef struct {
+ char *driver_name;
+ char *driver_parameter;
+ int driver_poll;
+ int poll;
+ int filter_length;
+ int local;
+ int pps_forced;
+ int pps_rate;
+ int min_samples;
+ int max_samples;
+ int sel_options;
+ int max_lock_age;
+ int stratum;
+ int tai;
+ uint32_t ref_id;
+ uint32_t lock_ref_id;
+ double offset;
+ double delay;
+ double precision;
+ double max_dispersion;
+ double pulse_width;
+} RefclockParameters;
+
+typedef struct RCL_Instance_Record *RCL_Instance;
+
+typedef struct {
+ int (*init)(RCL_Instance instance);
+ void (*fini)(RCL_Instance instance);
+ int (*poll)(RCL_Instance instance);
+} RefclockDriver;
+
+extern void RCL_Initialise(void);
+extern void RCL_Finalise(void);
+extern int RCL_AddRefclock(RefclockParameters *params);
+extern void RCL_StartRefclocks(void);
+extern void RCL_ReportSource(RPT_SourceReport *report, struct timespec *now);
+
+/* functions used by drivers */
+extern void RCL_SetDriverData(RCL_Instance instance, void *data);
+extern void *RCL_GetDriverData(RCL_Instance instance);
+extern char *RCL_GetDriverParameter(RCL_Instance instance);
+extern void RCL_CheckDriverOptions(RCL_Instance instance, const char **options);
+extern char *RCL_GetDriverOption(RCL_Instance instance, char *name);
+extern int RCL_AddSample(RCL_Instance instance, struct timespec *sample_time,
+ struct timespec *ref_time, int leap);
+extern int RCL_AddPulse(RCL_Instance instance, struct timespec *pulse_time, double second);
+extern int RCL_AddCookedPulse(RCL_Instance instance, struct timespec *cooked_time,
+ double second, double dispersion, double raw_correction);
+extern double RCL_GetPrecision(RCL_Instance instance);
+extern int RCL_GetDriverPoll(RCL_Instance instance);
+
+#endif