time.h revision 1.3 
1/*	$NetBSD: time.h,v 1.3 2014/07/16 20:56:25 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 void
58do_gettimeofday(struct timeval *tv)
59{
60	microtime(tv);
61}
62
63static inline bool
64timespec_valid(const struct timespec *ts)
65{
66	if (ts->tv_sec < 0)
67		return false;
68	if (1000000000L <= ts->tv_nsec)
69		return false;
70	return true;
71}
72
73static inline struct timespec
74ns_to_timespec(const int64_t nsec)
75{
76	struct timespec ts;
77
78	ts.tv_sec = (nsec / 1000000000L);
79	ts.tv_nsec = (nsec % 1000000000L);
80	if (ts.tv_nsec < 0) {
81		ts.tv_sec -= 1;
82		ts.tv_nsec += 1000000000L;
83	}
84
85	return ts;
86}
87
88static inline int64_t
89timespec_to_ns(const struct timespec *ts)
90{
91	return (((int64_t)ts->tv_sec * 1000000000LL) + ts->tv_nsec);
92}
93
94static inline struct timeval
95ns_to_timeval(int64_t nsec)
96{
97	struct timespec ts;
98	struct timeval tv;
99
100	ts = ns_to_timespec(nsec);
101	TIMESPEC_TO_TIMEVAL(&tv, &ts);
102
103	return tv;
104}
105
106static inline int64_t
107timeval_to_ns(struct timeval *tv)
108{
109	return (((int64_t)tv->tv_sec * 1000000000UL) + (tv->tv_usec * 1000ul));
110}
111
112static inline struct timespec
113timespec_sub(struct timespec a, struct timespec b)
114{
115	struct timespec d;
116
117	timespecsub(&a, &b, &d);
118
119	return d;
120}
121
122static inline void
123set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec)
124{
125	while (nsec >= 1000000000L) {
126		nsec -= 1000000000L;
127		sec += 1;
128	}
129	while (nsec < 0) {
130		nsec += 1000000000L;
131		sec -= 1;
132	}
133	ts->tv_sec = sec;
134	ts->tv_nsec = nsec;
135}
136
137#endif  /* _LINUX_TIME_H_ */
138