time.h revision 1.4 
1/*	$NetBSD: time.h,v 1.4 2018/08/27 06:16:50 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#define NSEC_PER_MSEC	1000000L
38
39/*
40 * XXX get_seconds as implemented by Linux is a Y2038 bug waiting to
41 * happen on 32-bit systems because it returns unsigned long.  Some
42 * callers in Linux (implicitly) convert the result to time_t, though.
43 * We'll pretend get_seconds returns time_t and make sure all our
44 * callers treat it as if it did.
45 */
46
47static inline time_t
48get_seconds(void)
49{
50	return time_second;
51}
52
53static inline void
54getrawmonotonic(struct timespec *ts)
55{
56	getnanouptime(ts);
57}
58
59static inline void
60do_gettimeofday(struct timeval *tv)
61{
62	microtime(tv);
63}
64
65static inline bool
66timespec_valid(const struct timespec *ts)
67{
68	if (ts->tv_sec < 0)
69		return false;
70	if (1000000000L <= ts->tv_nsec)
71		return false;
72	return true;
73}
74
75static inline struct timespec
76ns_to_timespec(const int64_t nsec)
77{
78	struct timespec ts;
79
80	ts.tv_sec = (nsec / 1000000000L);
81	ts.tv_nsec = (nsec % 1000000000L);
82	if (ts.tv_nsec < 0) {
83		ts.tv_sec -= 1;
84		ts.tv_nsec += 1000000000L;
85	}
86
87	return ts;
88}
89
90static inline int64_t
91timespec_to_ns(const struct timespec *ts)
92{
93	return (((int64_t)ts->tv_sec * 1000000000LL) + ts->tv_nsec);
94}
95
96static inline struct timeval
97ns_to_timeval(int64_t nsec)
98{
99	struct timespec ts;
100	struct timeval tv;
101
102	ts = ns_to_timespec(nsec);
103	TIMESPEC_TO_TIMEVAL(&tv, &ts);
104
105	return tv;
106}
107
108static inline int64_t
109timeval_to_ns(struct timeval *tv)
110{
111	return (((int64_t)tv->tv_sec * 1000000000UL) + (tv->tv_usec * 1000ul));
112}
113
114static inline struct timespec
115timespec_sub(struct timespec a, struct timespec b)
116{
117	struct timespec d;
118
119	timespecsub(&a, &b, &d);
120
121	return d;
122}
123
124static inline void
125set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec)
126{
127	while (nsec >= 1000000000L) {
128		nsec -= 1000000000L;
129		sec += 1;
130	}
131	while (nsec < 0) {
132		nsec += 1000000000L;
133		sec -= 1;
134	}
135	ts->tv_sec = sec;
136	ts->tv_nsec = nsec;
137}
138
139#endif  /* _LINUX_TIME_H_ */
140