--- /dev/null
+/* $OpenBSD: time.h,v 1.37 2017/12/11 23:31:16 jca Exp $ */
+/* $NetBSD: time.h,v 1.18 1996/04/23 10:29:33 mycroft Exp $ */
+
+/*
+ * Copyright (c) 1982, 1986, 1993
+ * The Regents of the University of California. 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 University 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 REGENTS 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 REGENTS 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.
+ *
+ * @(#)time.h 8.2 (Berkeley) 7/10/94
+ */
+
+#ifndef _SYS_TIME_H_
+#define _SYS_TIME_H_
+
+/* Operations on timespecs. */
+#ifndef timespecisset
+#define timespecisset(tsp) ((tsp)->tv_sec || (tsp)->tv_nsec)
+#endif
+#ifndef timespeccmp
+#define timespeccmp(tsp, usp, cmp) \
+ (((tsp)->tv_sec == (usp)->tv_sec) ? \
+ ((tsp)->tv_nsec cmp (usp)->tv_nsec) : \
+ ((tsp)->tv_sec cmp (usp)->tv_sec))
+#endif
+#ifndef timespecadd
+#define timespecadd(tsp, usp, vsp) \
+ do { \
+ (vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec; \
+ (vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec; \
+ if ((vsp)->tv_nsec >= 1000000000L) { \
+ (vsp)->tv_sec++; \
+ (vsp)->tv_nsec -= 1000000000L; \
+ } \
+ } while (0)
+#endif
+
+#endif /* !_SYS_TIME_H_ */