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diff --git a/rtrlib/lib/utils_private.h b/rtrlib/lib/utils_private.h
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+++ b/rtrlib/lib/utils_private.h
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+/*
+ * This file is part of RTRlib.
+ *
+ * This file is subject to the terms and conditions of the MIT license.
+ * See the file LICENSE in the top level directory for more details.
+ *
+ * Website: http://rtrlib.realmv6.org/
+ */
+
+#ifndef LRTR_UTILS_PRIVATE_H
+#define LRTR_UTILS_PRIVATE_H
+
+#include <stdint.h>
+#include <time.h>
+
+/**
+ * @brief Returns the current time of the CLOCK_MONOTONIC clock.
+ * @param[in] seconds Time in seconds since some unspecified starting point.
+ * @return 0 on successs
+ * @return -1 on error
+ */
+int lrtr_get_monotonic_time(time_t *seconds);
+
+/**
+ * @brief Extracts number bits from the passed uint32_t, starting at bit number from. The bit with the highest
+ * significance is bit 0. All bits that aren't in the specified range will be 0.
+ * @param[in] val uint32_t
+ * @param[in] from Position of the first bit that is extracted.
+ * @param[in] number How many bits will be extracted.
+ * @returns a uint32_t, where all bits that aren't in the specified range are set to 0.
+ */
+uint32_t lrtr_get_bits(const uint32_t val, const uint8_t from, const uint8_t number);
+
+#endif