time.h revision 1.2 
1/*	$NetBSD: time.h,v 1.2 2014/03/18 18:20:43 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _LINUX_TIME_H_
33#define _LINUX_TIME_H_
34
35#include <sys/time.h>
36
37/*
38 * XXX get_seconds as implemented by Linux is a Y2038 bug waiting to
39 * happen on 32-bit systems because it returns unsigned long.  Some
40 * callers in Linux (implicitly) convert the result to time_t, though.
41 * We'll pretend get_seconds returns time_t and make sure all our
42 * callers treat it as if it did.
43 */
44
45static inline time_t
46get_seconds(void)
47{
48	return time_second;
49}
50
51static inline void
52getrawmonotonic(struct timespec *ts)
53{
54	getnanouptime(ts);
55}
56
57static inline bool
58timespec_valid(const struct timespec *ts)
59{
60	if (ts->tv_sec < 0)
61		return false;
62	if (1000000000L <= ts->tv_nsec)
63		return false;
64	return true;
65}
66
67static inline struct timespec
68ns_to_timespec(const int64_t nsec)
69{
70	struct timespec ts;
71
72	ts.tv_sec = (nsec / 1000000000L);
73	ts.tv_nsec = (nsec % 1000000000L);
74	if (ts.tv_nsec < 0) {
75		ts.tv_sec -= 1;
76		ts.tv_nsec += 1000000000L;
77	}
78
79	return ts;
80}
81
82static inline int64_t
83timespec_to_ns(const struct timespec *ts)
84{
85	return (((int64_t)ts->tv_sec * 1000000000LL) + ts->tv_nsec);
86}
87
88static inline struct timespec
89timespec_sub(struct timespec a, struct timespec b)
90{
91	struct timespec d;
92
93	timespecsub(&a, &b, &d);
94
95	return d;
96}
97
98static inline void
99set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec)
100{
101	while (nsec >= 1000000000L) {
102		nsec -= 1000000000L;
103		sec += 1;
104	}
105	while (nsec < 0) {
106		nsec += 1000000000L;
107		sec -= 1;
108	}
109	ts->tv_sec = sec;
110	ts->tv_nsec = nsec;
111}
112
113#endif  /* _LINUX_TIME_H_ */
114