1 /* $OpenBSD: time_utils.c,v 1.3 2015/12/17 08:01:55 tb Exp $ */
2 /*-
3 * Copyright (c) 2008 Internet Initiative Japan Inc.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/types.h>
29 #include <time.h>
30 #include <stdint.h>
31
32 #include "time_utils.h"
33
34 /**
35 * Return the value of system timer in nano seconds.
36 * Returns INT64_MIN on error.
37 */
38 int64_t
get_nanotime(void)39 get_nanotime(void)
40 {
41 struct timespec ts;
42 int64_t rval;
43
44 if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
45 return INT64_MIN;
46 rval = (int64_t)ts.tv_sec * (int64_t)1000000000LL;
47 rval = rval + (int64_t)ts.tv_nsec;
48
49 return rval;
50 }
51