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  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.  
  9. extern struct timezone sys_tz;
  10.  
  11. #define TIME_T_MAX      (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
  12.  
  13. static 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.  * lhs < rhs:  return <0
  21.  * lhs == rhs: return 0
  22.  * lhs > rhs:  return >0
  23.  */
  24. static 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.  
  33. static 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.  
  42. extern 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.  * Deprecated. Use mktime64().
  48.  */
  49. static 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.  
  57. extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
  58.  
  59. /*
  60.  * timespec_add_safe assumes both values are positive and checks
  61.  * for overflow. It will return TIME_T_MAX if the reutrn would be
  62.  * smaller then either of the arguments.
  63.  */
  64. extern struct timespec timespec_add_safe(const struct timespec lhs,
  65.                                          const struct timespec rhs);
  66.  
  67.  
  68. static 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.  * sub = lhs - rhs, in normalized form
  79.  */
  80. static 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.  * Returns true if the timespec is norm, false if denorm:
  91.  */
  92. static inline bool timespec_valid(const struct timespec *ts)
  93. {
  94.         /* Dates before 1970 are bogus */
  95.         if (ts->tv_sec < 0)
  96.                 return false;
  97.         /* Can't have more nanoseconds then a second */
  98.         if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
  99.                 return false;
  100.         return true;
  101. }
  102.  
  103. static inline bool timespec_valid_strict(const struct timespec *ts)
  104. {
  105.         if (!timespec_valid(ts))
  106.                 return false;
  107.         /* Disallow values that could overflow ktime_t */
  108.         if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
  109.                 return false;
  110.         return true;
  111. }
  112.  
  113. static inline bool timeval_valid(const struct timeval *tv)
  114. {
  115.         /* Dates before 1970 are bogus */
  116.         if (tv->tv_sec < 0)
  117.                 return false;
  118.  
  119.         /* Can't have more microseconds then a second */
  120.         if (tv->tv_usec < 0 || tv->tv_usec >= USEC_PER_SEC)
  121.                 return false;
  122.  
  123.         return true;
  124. }
  125.  
  126. extern 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. /* Some architectures do not supply their own clocksource.
  132.  * This is mainly the case in architectures that get their
  133.  * inter-tick times by reading the counter on their interval
  134.  * timer. Since these timers wrap every tick, they're not really
  135.  * useful as clocksources. Wrapping them to act like one is possible
  136.  * but not very efficient. So we provide a callout these arches
  137.  * can implement for use with the jiffies clocksource to provide
  138.  * finer then tick granular time.
  139.  */
  140. #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
  141. extern u32 (*arch_gettimeoffset)(void);
  142. #endif
  143.  
  144. struct itimerval;
  145. extern int do_setitimer(int which, struct itimerval *value,
  146.                         struct itimerval *ovalue);
  147. extern int do_getitimer(int which, struct itimerval *value);
  148.  
  149. extern unsigned int alarm_setitimer(unsigned int seconds);
  150.  
  151. extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
  152.  
  153. struct tms;
  154. extern void do_sys_times(struct tms *);
  155.  
  156. /*
  157.  * Similar to the struct tm in userspace <time.h>, but it needs to be here so
  158.  * that the kernel source is self contained.
  159.  */
  160. struct tm {
  161.         /*
  162.          * the number of seconds after the minute, normally in the range
  163.          * 0 to 59, but can be up to 60 to allow for leap seconds
  164.          */
  165.         int tm_sec;
  166.         /* the number of minutes after the hour, in the range 0 to 59*/
  167.         int tm_min;
  168.         /* the number of hours past midnight, in the range 0 to 23 */
  169.         int tm_hour;
  170.         /* the day of the month, in the range 1 to 31 */
  171.         int tm_mday;
  172.         /* the number of months since January, in the range 0 to 11 */
  173.         int tm_mon;
  174.         /* the number of years since 1900 */
  175.         long tm_year;
  176.         /* the number of days since Sunday, in the range 0 to 6 */
  177.         int tm_wday;
  178.         /* the number of days since January 1, in the range 0 to 365 */
  179.         int tm_yday;
  180. };
  181.  
  182. void time_to_tm(time_t totalsecs, int offset, struct tm *result);
  183.  
  184. /**
  185.  * timespec_to_ns - Convert timespec to nanoseconds
  186.  * @ts:         pointer to the timespec variable to be converted
  187.  *
  188.  * Returns the scalar nanosecond representation of the timespec
  189.  * parameter.
  190.  */
  191. static 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.  * timeval_to_ns - Convert timeval to nanoseconds
  198.  * @ts:         pointer to the timeval variable to be converted
  199.  *
  200.  * Returns the scalar nanosecond representation of the timeval
  201.  * parameter.
  202.  */
  203. static 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.  * ns_to_timespec - Convert nanoseconds to timespec
  211.  * @nsec:       the nanoseconds value to be converted
  212.  *
  213.  * Returns the timespec representation of the nsec parameter.
  214.  */
  215. extern struct timespec ns_to_timespec(const s64 nsec);
  216.  
  217. /**
  218.  * ns_to_timeval - Convert nanoseconds to timeval
  219.  * @nsec:       the nanoseconds value to be converted
  220.  *
  221.  * Returns the timeval representation of the nsec parameter.
  222.  */
  223. extern struct timeval ns_to_timeval(const s64 nsec);
  224.  
  225. /**
  226.  * timespec_add_ns - Adds nanoseconds to a timespec
  227.  * @a:          pointer to timespec to be incremented
  228.  * @ns:         unsigned nanoseconds value to be added
  229.  *
  230.  * This must always be inlined because its used from the x86-64 vdso,
  231.  * which cannot call other kernel functions.
  232.  */
  233. static __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.