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diff --git a/lwip/src/include/lwip/timeouts.h b/lwip/src/include/lwip/timeouts.h
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+++ b/lwip/src/include/lwip/timeouts.h
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+/**
+ * @file
+ * Timer implementations
+ */
+
+/*
+ * Copyright (c) 2001-2004 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *         Simon Goldschmidt
+ *
+ */
+#ifndef LWIP_HDR_TIMEOUTS_H
+#define LWIP_HDR_TIMEOUTS_H
+
+#include "lwip/opt.h"
+#include "lwip/err.h"
+#if !NO_SYS
+#include "lwip/sys.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef LWIP_DEBUG_TIMERNAMES
+#ifdef LWIP_DEBUG
+#define LWIP_DEBUG_TIMERNAMES SYS_DEBUG
+#else /* LWIP_DEBUG */
+#define LWIP_DEBUG_TIMERNAMES 0
+#endif /* LWIP_DEBUG*/
+#endif
+
+/** Returned by sys_timeouts_sleeptime() to indicate there is no timer, so we
+ * can sleep forever.
+ */
+#define SYS_TIMEOUTS_SLEEPTIME_INFINITE 0xFFFFFFFF
+
+/** Function prototype for a stack-internal timer function that has to be
+ * called at a defined interval */
+typedef void (* lwip_cyclic_timer_handler)(void);
+
+/** This struct contains information about a stack-internal timer function
+ that has to be called at a defined interval */
+struct lwip_cyclic_timer {
+  u32_t interval_ms;
+  lwip_cyclic_timer_handler handler;
+#if LWIP_DEBUG_TIMERNAMES
+  const char* handler_name;
+#endif /* LWIP_DEBUG_TIMERNAMES */
+};
+
+/** This array contains all stack-internal cyclic timers. To get the number of
+ * timers, use lwip_num_cyclic_timers */
+extern const struct lwip_cyclic_timer lwip_cyclic_timers[];
+/** Array size of lwip_cyclic_timers[] */
+extern const int lwip_num_cyclic_timers;
+
+#if LWIP_TIMERS
+
+/** Function prototype for a timeout callback function. Register such a function
+ * using sys_timeout().
+ *
+ * @param arg Additional argument to pass to the function - set up by sys_timeout()
+ */
+typedef void (* sys_timeout_handler)(void *arg);
+
+struct sys_timeo {
+  struct sys_timeo *next;
+  u32_t time;
+  sys_timeout_handler h;
+  void *arg;
+#if LWIP_DEBUG_TIMERNAMES
+  const char* handler_name;
+#endif /* LWIP_DEBUG_TIMERNAMES */
+};
+
+void sys_timeouts_init(void);
+
+#if LWIP_DEBUG_TIMERNAMES
+void sys_timeout_debug(u32_t msecs, sys_timeout_handler handler, void *arg, const char* handler_name);
+#define sys_timeout(msecs, handler, arg) sys_timeout_debug(msecs, handler, arg, #handler)
+#else /* LWIP_DEBUG_TIMERNAMES */
+void sys_timeout(u32_t msecs, sys_timeout_handler handler, void *arg);
+#endif /* LWIP_DEBUG_TIMERNAMES */
+
+void sys_untimeout(sys_timeout_handler handler, void *arg);
+void sys_restart_timeouts(void);
+void sys_check_timeouts(void);
+u32_t sys_timeouts_sleeptime(void);
+
+#if LWIP_TESTMODE
+struct sys_timeo** sys_timeouts_get_next_timeout(void);
+void lwip_cyclic_timer(void *arg);
+#endif
+
+#endif /* LWIP_TIMERS */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_TIMEOUTS_H */