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_safe timespec_add_safe
69# define timespec64_add timespec_add
70# define timespec64_sub timespec_sub
71# define timespec64_valid timespec_valid
72# define timespec64_valid_strict timespec_valid_strict
73# define timespec64_to_ns timespec_to_ns
74# define ns_to_timespec64 ns_to_timespec
75# define timespec64_add_ns timespec_add_ns
76
77#else
78
79static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
80{
81 struct timespec ret;
82
83 ret.tv_sec = (time_t)ts64.tv_sec;
84 ret.tv_nsec = ts64.tv_nsec;
85 return ret;
86}
87
88static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
89{
90 struct timespec64 ret;
91
92 ret.tv_sec = ts.tv_sec;
93 ret.tv_nsec = ts.tv_nsec;
94 return ret;
95}
96
97static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64)
98{
99 struct itimerspec ret;
100
101 ret.it_interval = timespec64_to_timespec(its64->it_interval);
102 ret.it_value = timespec64_to_timespec(its64->it_value);
103 return ret;
104}
105
106static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its)
107{
108 struct itimerspec64 ret;
109
110 ret.it_interval = timespec_to_timespec64(its->it_interval);
111 ret.it_value = timespec_to_timespec64(its->it_value);
112 return ret;
113}
114
115static inline int timespec64_equal(const struct timespec64 *a,
116 const struct timespec64 *b)
117{
118 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
119}
120
121/*
122 * lhs < rhs: return <0
123 * lhs == rhs: return 0
124 * lhs > rhs: return >0
125 */
126static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs)
127{
128 if (lhs->tv_sec < rhs->tv_sec)
129 return -1;
130 if (lhs->tv_sec > rhs->tv_sec)
131 return 1;
132 return lhs->tv_nsec - rhs->tv_nsec;
133}
134
135extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec);
136
137/*
138 * timespec64_add_safe assumes both values are positive and checks for
139 * overflow. It will return TIME_T_MAX if the returned value would be
140 * smaller then either of the arguments.
141 */
142extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
143 const struct timespec64 rhs);
144
145
146static inline struct timespec64 timespec64_add(struct timespec64 lhs,
147 struct timespec64 rhs)
148{
149 struct timespec64 ts_delta;
150 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec,
151 lhs.tv_nsec + rhs.tv_nsec);
152 return ts_delta;
153}
154
155/*
156 * sub = lhs - rhs, in normalized form
157 */
158static inline struct timespec64 timespec64_sub(struct timespec64 lhs,
159 struct timespec64 rhs)
160{
161 struct timespec64 ts_delta;
162 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec,
163 lhs.tv_nsec - rhs.tv_nsec);
164 return ts_delta;
165}
166
167/*
168 * Returns true if the timespec64 is norm, false if denorm:
169 */
170static inline bool timespec64_valid(const struct timespec64 *ts)
171{
172 /* Dates before 1970 are bogus */
173 if (ts->tv_sec < 0)
174 return false;
175 /* Can't have more nanoseconds then a second */
176 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
177 return false;
178 return true;
179}
180
181static inline bool timespec64_valid_strict(const struct timespec64 *ts)
182{
183 if (!timespec64_valid(ts))
184 return false;
185 /* Disallow values that could overflow ktime_t */
186 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
187 return false;
188 return true;
189}
190
191/**
192 * timespec64_to_ns - Convert timespec64 to nanoseconds
193 * @ts: pointer to the timespec64 variable to be converted
194 *
195 * Returns the scalar nanosecond representation of the timespec64
196 * parameter.
197 */
198static inline s64 timespec64_to_ns(const struct timespec64 *ts)
199{
200 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
201}
202
203/**
204 * ns_to_timespec64 - Convert nanoseconds to timespec64
205 * @nsec: the nanoseconds value to be converted
206 *
207 * Returns the timespec64 representation of the nsec parameter.
208 */
209extern struct timespec64 ns_to_timespec64(const s64 nsec);
210
211/**
212 * timespec64_add_ns - Adds nanoseconds to a timespec64
213 * @a: pointer to timespec64 to be incremented
214 * @ns: unsigned nanoseconds value to be added
215 *
216 * This must always be inlined because its used from the x86-64 vdso,
217 * which cannot call other kernel functions.
218 */
219static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns)
220{
221 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
222 a->tv_nsec = ns;
223}
224
225#endif
226
227#endif /* _LINUX_TIME64_H */