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Linux/include/linux/time.h

  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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