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diff --git a/uip/uip/clock.h b/uip/uip/clock.h
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+/**
+ * \defgroup clock Clock interface
+ *
+ * The clock interface is the interface between the \ref timer "timer library"
+ * and the platform specific clock functionality. The clock
+ * interface must be implemented for each platform that uses the \ref
+ * timer "timer library".
+ *
+ * The clock interface does only one this: it measures time. The clock
+ * interface provides a macro, CLOCK_SECOND, which corresponds to one
+ * second of system time.
+ *
+ * \sa \ref timer "Timer library"
+ *
+ * @{
+ */
+
+/*
+ * Copyright (c) 2004, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the uIP TCP/IP stack
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ * $Id: clock.h,v 1.3 2006/06/11 21:46:39 adam Exp $
+ */
+#ifndef __CLOCK_H__
+#define __CLOCK_H__
+
+#include "clock-arch.h"
+
+/**
+ * Initialize the clock library.
+ *
+ * This function initializes the clock library and should be called
+ * from the main() function of the system.
+ *
+ */
+void clock_init(void);
+
+/**
+ * Get the current clock time.
+ *
+ * This function returns the current system clock time.
+ *
+ * \return The current clock time, measured in system ticks.
+ */
+clock_time_t clock_time(void);
+
+/**
+ * A second, measured in system clock time.
+ *
+ * \hideinitializer
+ */
+#ifdef CLOCK_CONF_SECOND
+#define CLOCK_SECOND CLOCK_CONF_SECOND
+#else
+#define CLOCK_SECOND (clock_time_t)32
+#endif
+
+#endif /* __CLOCK_H__ */
+
+/** @} */