Linux kernel mirror (for testing)
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linux
1#ifndef _LINUX_TIME64_H
2#define _LINUX_TIME64_H
3
4#include <uapi/linux/time.h>
5#include <linux/math64.h>
6
7typedef __s64 time64_t;
8
9/*
10 * This wants to go into uapi/linux/time.h once we agreed about the
11 * userspace interfaces.
12 */
13#if __BITS_PER_LONG == 64
14# define timespec64 timespec
15#else
16struct timespec64 {
17 time64_t tv_sec; /* seconds */
18 long tv_nsec; /* nanoseconds */
19};
20#endif
21
22/* Parameters used to convert the timespec values: */
23#define MSEC_PER_SEC 1000L
24#define USEC_PER_MSEC 1000L
25#define NSEC_PER_USEC 1000L
26#define NSEC_PER_MSEC 1000000L
27#define USEC_PER_SEC 1000000L
28#define NSEC_PER_SEC 1000000000L
29#define FSEC_PER_SEC 1000000000000000LL
30
31/* Located here for timespec[64]_valid_strict */
32#define TIME64_MAX ((s64)~((u64)1 << 63))
33#define KTIME_MAX ((s64)~((u64)1 << 63))
34#define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
35
36#if __BITS_PER_LONG == 64
37
38static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
39{
40 return ts64;
41}
42
43static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
44{
45 return ts;
46}
47
48# define timespec64_equal timespec_equal
49# define timespec64_compare timespec_compare
50# define set_normalized_timespec64 set_normalized_timespec
51# define timespec64_add_safe timespec_add_safe
52# define timespec64_add timespec_add
53# define timespec64_sub timespec_sub
54# define timespec64_valid timespec_valid
55# define timespec64_valid_strict timespec_valid_strict
56# define timespec64_to_ns timespec_to_ns
57# define ns_to_timespec64 ns_to_timespec
58# define timespec64_add_ns timespec_add_ns
59
60#else
61
62static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
63{
64 struct timespec ret;
65
66 ret.tv_sec = (time_t)ts64.tv_sec;
67 ret.tv_nsec = ts64.tv_nsec;
68 return ret;
69}
70
71static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
72{
73 struct timespec64 ret;
74
75 ret.tv_sec = ts.tv_sec;
76 ret.tv_nsec = ts.tv_nsec;
77 return ret;
78}
79
80static inline int timespec64_equal(const struct timespec64 *a,
81 const struct timespec64 *b)
82{
83 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
84}
85
86/*
87 * lhs < rhs: return <0
88 * lhs == rhs: return 0
89 * lhs > rhs: return >0
90 */
91static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs)
92{
93 if (lhs->tv_sec < rhs->tv_sec)
94 return -1;
95 if (lhs->tv_sec > rhs->tv_sec)
96 return 1;
97 return lhs->tv_nsec - rhs->tv_nsec;
98}
99
100extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec);
101
102/*
103 * timespec64_add_safe assumes both values are positive and checks for
104 * overflow. It will return TIME_T_MAX if the returned value would be
105 * smaller then either of the arguments.
106 */
107extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
108 const struct timespec64 rhs);
109
110
111static inline struct timespec64 timespec64_add(struct timespec64 lhs,
112 struct timespec64 rhs)
113{
114 struct timespec64 ts_delta;
115 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec,
116 lhs.tv_nsec + rhs.tv_nsec);
117 return ts_delta;
118}
119
120/*
121 * sub = lhs - rhs, in normalized form
122 */
123static inline struct timespec64 timespec64_sub(struct timespec64 lhs,
124 struct timespec64 rhs)
125{
126 struct timespec64 ts_delta;
127 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec,
128 lhs.tv_nsec - rhs.tv_nsec);
129 return ts_delta;
130}
131
132/*
133 * Returns true if the timespec64 is norm, false if denorm:
134 */
135static inline bool timespec64_valid(const struct timespec64 *ts)
136{
137 /* Dates before 1970 are bogus */
138 if (ts->tv_sec < 0)
139 return false;
140 /* Can't have more nanoseconds then a second */
141 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
142 return false;
143 return true;
144}
145
146static inline bool timespec64_valid_strict(const struct timespec64 *ts)
147{
148 if (!timespec64_valid(ts))
149 return false;
150 /* Disallow values that could overflow ktime_t */
151 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
152 return false;
153 return true;
154}
155
156/**
157 * timespec64_to_ns - Convert timespec64 to nanoseconds
158 * @ts: pointer to the timespec64 variable to be converted
159 *
160 * Returns the scalar nanosecond representation of the timespec64
161 * parameter.
162 */
163static inline s64 timespec64_to_ns(const struct timespec64 *ts)
164{
165 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
166}
167
168/**
169 * ns_to_timespec64 - Convert nanoseconds to timespec64
170 * @nsec: the nanoseconds value to be converted
171 *
172 * Returns the timespec64 representation of the nsec parameter.
173 */
174extern struct timespec64 ns_to_timespec64(const s64 nsec);
175
176/**
177 * timespec64_add_ns - Adds nanoseconds to a timespec64
178 * @a: pointer to timespec64 to be incremented
179 * @ns: unsigned nanoseconds value to be added
180 *
181 * This must always be inlined because its used from the x86-64 vdso,
182 * which cannot call other kernel functions.
183 */
184static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns)
185{
186 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
187 a->tv_nsec = ns;
188}
189
190#endif
191
192#endif /* _LINUX_TIME64_H */