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-rw-r--r--src/lib/time/tvdiff.h16
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diff --git a/src/lib/time/tvdiff.h b/src/lib/time/tvdiff.h
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+/* Copyright (c) 2003-2004, Roger Dingledine
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+#ifndef TOR_TVDIFF_H
+#define TOR_TVDIFF_H
+
+#include "lib/cc/torint.h"
+struct timeval;
+
+long tv_udiff(const struct timeval *start, const struct timeval *end);
+long tv_mdiff(const struct timeval *start, const struct timeval *end);
+int64_t tv_to_msec(const struct timeval *tv);
+
+#endif