Line data Source code
1 : #ifndef _LINUX_TIME_H
2 : #define _LINUX_TIME_H
3 :
4 : #include <linux/types.h>
5 :
6 : #ifdef __KERNEL__
7 : # include <linux/cache.h>
8 : # include <linux/seqlock.h>
9 : # include <linux/math64.h>
10 : #endif
11 :
12 : #ifndef _STRUCT_TIMESPEC
13 : #define _STRUCT_TIMESPEC
14 : struct timespec {
15 : __kernel_time_t tv_sec; /* seconds */
16 : long tv_nsec; /* nanoseconds */
17 : };
18 1 : #endif
19 :
20 : struct timeval {
21 : __kernel_time_t tv_sec; /* seconds */
22 : __kernel_suseconds_t tv_usec; /* microseconds */
23 : };
24 :
25 : struct timezone {
26 : int tz_minuteswest; /* minutes west of Greenwich */
27 : int tz_dsttime; /* type of dst correction */
28 : };
29 :
30 : #ifdef __KERNEL__
31 :
32 : extern struct timezone sys_tz;
33 :
34 : /* Parameters used to convert the timespec values: */
35 : #define MSEC_PER_SEC 1000L
36 : #define USEC_PER_MSEC 1000L
37 : #define NSEC_PER_USEC 1000L
38 : #define NSEC_PER_MSEC 1000000L
39 : #define USEC_PER_SEC 1000000L
40 : #define NSEC_PER_SEC 1000000000L
41 : #define FSEC_PER_SEC 1000000000000000L
42 :
43 : #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
44 :
45 : static inline int timespec_equal(const struct timespec *a,
46 : const struct timespec *b)
47 : {
48 : return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
49 : }
50 :
51 : /*
52 : * lhs < rhs: return <0
53 : * lhs == rhs: return 0
54 : * lhs > rhs: return >0
55 : */
56 : static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
57 : {
58 : if (lhs->tv_sec < rhs->tv_sec)
59 : return -1;
60 : if (lhs->tv_sec > rhs->tv_sec)
61 : return 1;
62 : return lhs->tv_nsec - rhs->tv_nsec;
63 : }
64 :
65 : static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
66 : {
67 : if (lhs->tv_sec < rhs->tv_sec)
68 : return -1;
69 : if (lhs->tv_sec > rhs->tv_sec)
70 : return 1;
71 : return lhs->tv_usec - rhs->tv_usec;
72 : }
73 :
74 : extern unsigned long mktime(const unsigned int year, const unsigned int mon,
75 : const unsigned int day, const unsigned int hour,
76 : const unsigned int min, const unsigned int sec);
77 :
78 : extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
79 : extern struct timespec timespec_add_safe(const struct timespec lhs,
80 : const struct timespec rhs);
81 :
82 : /*
83 : * sub = lhs - rhs, in normalized form
84 : */
85 : static inline struct timespec timespec_sub(struct timespec lhs,
86 : struct timespec rhs)
87 : {
88 : struct timespec ts_delta;
89 : set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
90 : lhs.tv_nsec - rhs.tv_nsec);
91 : return ts_delta;
92 : }
93 :
94 : /*
95 : * Returns true if the timespec is norm, false if denorm:
96 : */
97 : #define timespec_valid(ts) \
98 : (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
99 :
100 : extern struct timespec xtime;
101 : extern struct timespec wall_to_monotonic;
102 : extern seqlock_t xtime_lock;
103 :
104 : extern void read_persistent_clock(struct timespec *ts);
105 : extern void read_boot_clock(struct timespec *ts);
106 : extern int update_persistent_clock(struct timespec now);
107 : extern int no_sync_cmos_clock __read_mostly;
108 : void timekeeping_init(void);
109 : extern int timekeeping_suspended;
110 :
111 : unsigned long get_seconds(void);
112 : struct timespec current_kernel_time(void);
113 : struct timespec __current_kernel_time(void); /* does not hold xtime_lock */
114 : struct timespec get_monotonic_coarse(void);
115 :
116 : #define CURRENT_TIME (current_kernel_time())
117 : #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
118 :
119 : /* Some architectures do not supply their own clocksource.
120 : * This is mainly the case in architectures that get their
121 : * inter-tick times by reading the counter on their interval
122 : * timer. Since these timers wrap every tick, they're not really
123 : * useful as clocksources. Wrapping them to act like one is possible
124 : * but not very efficient. So we provide a callout these arches
125 : * can implement for use with the jiffies clocksource to provide
126 : * finer then tick granular time.
127 : */
128 : #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
129 : extern u32 arch_gettimeoffset(void);
130 : #else
131 : static inline u32 arch_gettimeoffset(void) { return 0; }
132 : #endif
133 :
134 : extern void do_gettimeofday(struct timeval *tv);
135 : extern int do_settimeofday(struct timespec *tv);
136 : extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
137 : #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
138 : extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags);
139 : struct itimerval;
140 : extern int do_setitimer(int which, struct itimerval *value,
141 : struct itimerval *ovalue);
142 : extern unsigned int alarm_setitimer(unsigned int seconds);
143 : extern int do_getitimer(int which, struct itimerval *value);
144 : extern void getnstimeofday(struct timespec *tv);
145 : extern void getrawmonotonic(struct timespec *ts);
146 : extern void getboottime(struct timespec *ts);
147 : extern void monotonic_to_bootbased(struct timespec *ts);
148 :
149 : extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
150 : extern int timekeeping_valid_for_hres(void);
151 : extern u64 timekeeping_max_deferment(void);
152 : extern void update_wall_time(void);
153 : extern void update_xtime_cache(u64 nsec);
154 : extern void timekeeping_leap_insert(int leapsecond);
155 :
156 : struct tms;
157 : extern void do_sys_times(struct tms *);
158 :
159 : /*
160 : * Similar to the struct tm in userspace <time.h>, but it needs to be here so
161 : * that the kernel source is self contained.
162 : */
163 : struct tm {
164 : /*
165 : * the number of seconds after the minute, normally in the range
166 : * 0 to 59, but can be up to 60 to allow for leap seconds
167 : */
168 : int tm_sec;
169 : /* the number of minutes after the hour, in the range 0 to 59*/
170 : int tm_min;
171 : /* the number of hours past midnight, in the range 0 to 23 */
172 : int tm_hour;
173 : /* the day of the month, in the range 1 to 31 */
174 : int tm_mday;
175 : /* the number of months since January, in the range 0 to 11 */
176 : int tm_mon;
177 : /* the number of years since 1900 */
178 : long tm_year;
179 : /* the number of days since Sunday, in the range 0 to 6 */
180 : int tm_wday;
181 : /* the number of days since January 1, in the range 0 to 365 */
182 : int tm_yday;
183 : };
184 :
185 : void time_to_tm(time_t totalsecs, int offset, struct tm *result);
186 :
187 : /**
188 : * timespec_to_ns - Convert timespec to nanoseconds
189 : * @ts: pointer to the timespec variable to be converted
190 : *
191 : * Returns the scalar nanosecond representation of the timespec
192 : * parameter.
193 : */
194 : static inline s64 timespec_to_ns(const struct timespec *ts)
195 : {
196 : return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
197 : }
198 :
199 : /**
200 : * timeval_to_ns - Convert timeval to nanoseconds
201 : * @ts: pointer to the timeval variable to be converted
202 : *
203 : * Returns the scalar nanosecond representation of the timeval
204 : * parameter.
205 : */
206 : static inline s64 timeval_to_ns(const struct timeval *tv)
207 : {
208 : return ((s64) tv->tv_sec * NSEC_PER_SEC) +
209 : tv->tv_usec * NSEC_PER_USEC;
210 : }
211 :
212 : /**
213 : * ns_to_timespec - Convert nanoseconds to timespec
214 : * @nsec: the nanoseconds value to be converted
215 : *
216 : * Returns the timespec representation of the nsec parameter.
217 : */
218 : extern struct timespec ns_to_timespec(const s64 nsec);
219 :
220 : /**
221 : * ns_to_timeval - Convert nanoseconds to timeval
222 : * @nsec: the nanoseconds value to be converted
223 : *
224 : * Returns the timeval representation of the nsec parameter.
225 : */
226 : extern struct timeval ns_to_timeval(const s64 nsec);
227 :
228 : /**
229 : * timespec_add_ns - Adds nanoseconds to a timespec
230 : * @a: pointer to timespec to be incremented
231 : * @ns: unsigned nanoseconds value to be added
232 : *
233 : * This must always be inlined because its used from the x86-64 vdso,
234 : * which cannot call other kernel functions.
235 : */
236 : static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
237 : {
238 : a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
239 : a->tv_nsec = ns;
240 : }
241 : #endif /* __KERNEL__ */
242 :
243 : #define NFDBITS __NFDBITS
244 :
245 : #define FD_SETSIZE __FD_SETSIZE
246 : #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
247 : #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
248 : #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
249 : #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
250 :
251 : /*
252 : * Names of the interval timers, and structure
253 : * defining a timer setting:
254 : */
255 : #define ITIMER_REAL 0
256 : #define ITIMER_VIRTUAL 1
257 : #define ITIMER_PROF 2
258 :
259 : struct itimerspec {
260 : struct timespec it_interval; /* timer period */
261 : struct timespec it_value; /* timer expiration */
262 : };
263 :
264 : struct itimerval {
265 : struct timeval it_interval; /* timer interval */
266 : struct timeval it_value; /* current value */
267 : };
268 1 :
269 : /*
270 : * The IDs of the various system clocks (for POSIX.1b interval timers):
271 : */
272 : #define CLOCK_REALTIME 0
273 : #define CLOCK_MONOTONIC 1
274 : #define CLOCK_PROCESS_CPUTIME_ID 2
275 : #define CLOCK_THREAD_CPUTIME_ID 3
276 : #define CLOCK_MONOTONIC_RAW 4
277 : #define CLOCK_REALTIME_COARSE 5
278 : #define CLOCK_MONOTONIC_COARSE 6
279 :
280 : /*
281 : * The IDs of various hardware clocks:
282 : */
283 : #define CLOCK_SGI_CYCLE 10
284 : #define MAX_CLOCKS 16
285 : #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
286 : #define CLOCKS_MONO CLOCK_MONOTONIC
287 :
288 : /*
289 : * The various flags for setting POSIX.1b interval timers:
290 : */
291 : #define TIMER_ABSTIME 0x01
292 :
293 : #endif
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