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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 | #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 | |
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 |
294 |
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