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#define itimerspec64 itimerspec
16#else
17struct timespec64 {
18 time64_t tv_sec; /* seconds */
19 long tv_nsec; /* nanoseconds */
20};
21
22struct itimerspec64 {
23 struct timespec64 it_interval;
24 struct timespec64 it_value;
25};
26
27#endif
28
29/* Parameters used to convert the timespec values: */
30#define MSEC_PER_SEC 1000L
31#define USEC_PER_MSEC 1000L
32#define NSEC_PER_USEC 1000L
33#define NSEC_PER_MSEC 1000000L
34#define USEC_PER_SEC 1000000L
35#define NSEC_PER_SEC 1000000000L
36#define FSEC_PER_SEC 1000000000000000LL
37
38/* Located here for timespec[64]_valid_strict */
39#define TIME64_MAX ((s64)~((u64)1 << 63))
40#define KTIME_MAX ((s64)~((u64)1 << 63))
41#define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
42
43#if __BITS_PER_LONG == 64
44
45static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
46{
47 return ts64;
48}
49
50static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
51{
52 return ts;
53}
54
55static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64)
56{
57 return *its64;
58}
59
60static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its)
61{
62 return *its;
63}
64
65# define timespec64_equal timespec_equal
66# define timespec64_compare timespec_compare
67# define set_normalized_timespec64 set_normalized_timespec
68# define timespec64_add timespec_add
69# define timespec64_sub timespec_sub
70# define timespec64_valid timespec_valid
71# define timespec64_valid_strict timespec_valid_strict
72# define timespec64_to_ns timespec_to_ns
73# define ns_to_timespec64 ns_to_timespec
74# define timespec64_add_ns timespec_add_ns
75
76#else
77
78static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
79{
80 struct timespec ret;
81
82 ret.tv_sec = (time_t)ts64.tv_sec;
83 ret.tv_nsec = ts64.tv_nsec;
84 return ret;
85}
86
87static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
88{
89 struct timespec64 ret;
90
91 ret.tv_sec = ts.tv_sec;
92 ret.tv_nsec = ts.tv_nsec;
93 return ret;
94}
95
96static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64)
97{
98 struct itimerspec ret;
99
100 ret.it_interval = timespec64_to_timespec(its64->it_interval);
101 ret.it_value = timespec64_to_timespec(its64->it_value);
102 return ret;
103}
104
105static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its)
106{
107 struct itimerspec64 ret;
108
109 ret.it_interval = timespec_to_timespec64(its->it_interval);
110 ret.it_value = timespec_to_timespec64(its->it_value);
111 return ret;
112}
113
114static inline int timespec64_equal(const struct timespec64 *a,
115 const struct timespec64 *b)
116{
117 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
118}
119
120/*
121 * lhs < rhs: return <0
122 * lhs == rhs: return 0
123 * lhs > rhs: return >0
124 */
125static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs)
126{
127 if (lhs->tv_sec < rhs->tv_sec)
128 return -1;
129 if (lhs->tv_sec > rhs->tv_sec)
130 return 1;
131 return lhs->tv_nsec - rhs->tv_nsec;
132}
133
134extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec);
135
136static inline struct timespec64 timespec64_add(struct timespec64 lhs,
137 struct timespec64 rhs)
138{
139 struct timespec64 ts_delta;
140 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec,
141 lhs.tv_nsec + rhs.tv_nsec);
142 return ts_delta;
143}
144
145/*
146 * sub = lhs - rhs, in normalized form
147 */
148static inline struct timespec64 timespec64_sub(struct timespec64 lhs,
149 struct timespec64 rhs)
150{
151 struct timespec64 ts_delta;
152 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec,
153 lhs.tv_nsec - rhs.tv_nsec);
154 return ts_delta;
155}
156
157/*
158 * Returns true if the timespec64 is norm, false if denorm:
159 */
160static inline bool timespec64_valid(const struct timespec64 *ts)
161{
162 /* Dates before 1970 are bogus */
163 if (ts->tv_sec < 0)
164 return false;
165 /* Can't have more nanoseconds then a second */
166 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
167 return false;
168 return true;
169}
170
171static inline bool timespec64_valid_strict(const struct timespec64 *ts)
172{
173 if (!timespec64_valid(ts))
174 return false;
175 /* Disallow values that could overflow ktime_t */
176 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
177 return false;
178 return true;
179}
180
181/**
182 * timespec64_to_ns - Convert timespec64 to nanoseconds
183 * @ts: pointer to the timespec64 variable to be converted
184 *
185 * Returns the scalar nanosecond representation of the timespec64
186 * parameter.
187 */
188static inline s64 timespec64_to_ns(const struct timespec64 *ts)
189{
190 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
191}
192
193/**
194 * ns_to_timespec64 - Convert nanoseconds to timespec64
195 * @nsec: the nanoseconds value to be converted
196 *
197 * Returns the timespec64 representation of the nsec parameter.
198 */
199extern struct timespec64 ns_to_timespec64(const s64 nsec);
200
201/**
202 * timespec64_add_ns - Adds nanoseconds to a timespec64
203 * @a: pointer to timespec64 to be incremented
204 * @ns: unsigned nanoseconds value to be added
205 *
206 * This must always be inlined because its used from the x86-64 vdso,
207 * which cannot call other kernel functions.
208 */
209static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns)
210{
211 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
212 a->tv_nsec = ns;
213}
214
215#endif
216
217/*
218 * timespec64_add_safe assumes both values are positive and checks for
219 * overflow. It will return TIME64_MAX in case of overflow.
220 */
221extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
222 const struct timespec64 rhs);
223
224#endif /* _LINUX_TIME64_H */