include/linux/time.h

1 /*
2 * Copyright (c) 2014-2020 Fran��ois Tigeot <ftigeot@wolfpond.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * 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 ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef _LINUX_TIME_H_
28#define _LINUX_TIME_H_
29
30#define USEC_PER_MSEC 1000L
31#define USEC_PER_SEC 1000000L
32
33#define NSEC_PER_USEC 1000L
34#define NSEC_PER_MSEC 1000000L
35#define NSEC_PER_SEC 1000000000L
36
37#include <linux/cache.h>
38#include <linux/seqlock.h>
39#include <linux/math64.h>
40#include <linux/time64.h>
41
42#include <sys/time.h>
43
44 static inline struct timeval
45 ns_to_timeval(const int64_t nsec)
46{
47 struct timeval tv;
48 long rem;
49
50 if (nsec == 0) {
51 tv.tv_sec = 0;
52 tv.tv_usec = 0;
53 return (tv);
54 }
55
56 tv.tv_sec = nsec / NSEC_PER_SEC;
57 rem = nsec % NSEC_PER_SEC;
58 if (rem < 0) {
59 tv.tv_sec--;
60 rem += NSEC_PER_SEC;
61 }
62 tv.tv_usec = rem / 1000;
63 return (tv);
64}
65
66 static inline int64_t
67 timeval_to_ns(const struct timeval *tv)
68{
69 return ((int64_t)tv->tv_sec * NSEC_PER_SEC) +
70 tv->tv_usec * NSEC_PER_USEC;
71}
72
73#define getrawmonotonic(ts) nanouptime(ts)
74
75 static inline struct timespec
76 timespec_sub(struct timespec lhs, struct timespec rhs)
77{
78 struct timespec ts;
79
80 timespecsub(&lhs, &rhs, &ts);
81
82 return ts;
83}
84
85 static inline void
86 set_normalized_timespec(struct timespec *ts, time_t sec, int64_t nsec)
87{
88 /* XXX: this doesn't actually normalize anything */
89 ts->tv_sec = sec;
90 ts->tv_nsec = nsec;
91}
92
93 static inline int64_t
94 timespec_to_ns(const struct timespec *ts)
95{
96 return ((ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec);
97}
98
99 static inline struct timespec
100 ns_to_timespec(const int64_t nsec)
101{
102 struct timespec ts;
103 int32_t rem;
104
105 if (nsec == 0) {
106 ts.tv_sec = 0;
107 ts.tv_nsec = 0;
108 return (ts);
109 }
110
111 ts.tv_sec = nsec / NSEC_PER_SEC;
112 rem = nsec % NSEC_PER_SEC;
113 if (rem < 0) {
114 ts.tv_sec--;
115 rem += NSEC_PER_SEC;
116 }
117 ts.tv_nsec = rem;
118 return (ts);
119}
120
121 static inline int
122 timespec_valid(const struct timespec *ts)
123{
124 if (ts->tv_sec < 0 || ts->tv_sec > 100000000 ||
125 ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000)
126 return (0);
127 return (1);
128}
129
130 static inline unsigned long
131 get_seconds(void)
132{
133 return time_uptime;
134}
135
136#endif /* _LINUX_TIME_H_ */
137