1#ifndef _LINUX_TIME_H
2#define _LINUX_TIME_H
3
4# include <linux/cache.h>
5# include <linux/seqlock.h>
6# include <linux/math64.h>
7# include <linux/time64.h>
8
9extern struct timezone sys_tz;
10
11#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
12
13static inline int timespec_equal(const struct timespec *a,
14 const struct timespec *b)
15{
16 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
17}
18
19
20
21
22
23
24static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
25{
26 if (lhs->tv_sec < rhs->tv_sec)
27 return -1;
28 if (lhs->tv_sec > rhs->tv_sec)
29 return 1;
30 return lhs->tv_nsec - rhs->tv_nsec;
31}
32
33static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
34{
35 if (lhs->tv_sec < rhs->tv_sec)
36 return -1;
37 if (lhs->tv_sec > rhs->tv_sec)
38 return 1;
39 return lhs->tv_usec - rhs->tv_usec;
40}
41
42extern time64_t mktime64(const unsigned int year, const unsigned int mon,
43 const unsigned int day, const unsigned int hour,
44 const unsigned int min, const unsigned int sec);
45
46
47
48
49static inline unsigned long mktime(const unsigned int year,
50 const unsigned int mon, const unsigned int day,
51 const unsigned int hour, const unsigned int min,
52 const unsigned int sec)
53{
54 return mktime64(year, mon, day, hour, min, sec);
55}
56
57extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
58
59
60
61
62
63
64extern struct timespec timespec_add_safe(const struct timespec lhs,
65 const struct timespec rhs);
66
67
68static inline struct timespec timespec_add(struct timespec lhs,
69 struct timespec rhs)
70{
71 struct timespec ts_delta;
72 set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec,
73 lhs.tv_nsec + rhs.tv_nsec);
74 return ts_delta;
75}
76
77
78
79
80static inline struct timespec timespec_sub(struct timespec lhs,
81 struct timespec rhs)
82{
83 struct timespec ts_delta;
84 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
85 lhs.tv_nsec - rhs.tv_nsec);
86 return ts_delta;
87}
88
89
90
91
92static inline bool timespec_valid(const struct timespec *ts)
93{
94
95 if (ts->tv_sec < 0)
96 return false;
97
98 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
99 return false;
100 return true;
101}
102
103static inline bool timespec_valid_strict(const struct timespec *ts)
104{
105 if (!timespec_valid(ts))
106 return false;
107
108 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
109 return false;
110 return true;
111}
112
113static inline bool timeval_valid(const struct timeval *tv)
114{
115
116 if (tv->tv_sec < 0)
117 return false;
118
119
120 if (tv->tv_usec < 0 || tv->tv_usec >= USEC_PER_SEC)
121 return false;
122
123 return true;
124}
125
126extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
127
128#define CURRENT_TIME (current_kernel_time())
129#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
130
131
132
133
134
135
136
137
138
139
140#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
141extern u32 (*arch_gettimeoffset)(void);
142#endif
143
144struct itimerval;
145extern int do_setitimer(int which, struct itimerval *value,
146 struct itimerval *ovalue);
147extern int do_getitimer(int which, struct itimerval *value);
148
149extern unsigned int alarm_setitimer(unsigned int seconds);
150
151extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
152
153struct tms;
154extern void do_sys_times(struct tms *);
155
156
157
158
159
160struct tm {
161
162
163
164
165 int tm_sec;
166
167 int tm_min;
168
169 int tm_hour;
170
171 int tm_mday;
172
173 int tm_mon;
174
175 long tm_year;
176
177 int tm_wday;
178
179 int tm_yday;
180};
181
182void time_to_tm(time_t totalsecs, int offset, struct tm *result);
183
184
185
186
187
188
189
190
191static inline s64 timespec_to_ns(const struct timespec *ts)
192{
193 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
194}
195
196
197
198
199
200
201
202
203static inline s64 timeval_to_ns(const struct timeval *tv)
204{
205 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
206 tv->tv_usec * NSEC_PER_USEC;
207}
208
209
210
211
212
213
214
215extern struct timespec ns_to_timespec(const s64 nsec);
216
217
218
219
220
221
222
223extern struct timeval ns_to_timeval(const s64 nsec);
224
225
226
227
228
229
230
231
232
233static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
234{
235 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
236 a->tv_nsec = ns;
237}
238
239#endif
240