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       1                 :            : /* SPDX-License-Identifier: GPL-2.0 */
       2                 :            : #ifndef _LINUX_TIME_H
       3                 :            : #define _LINUX_TIME_H
       4                 :            : 
       5                 :            : # include <linux/cache.h>
       6                 :            : # include <linux/seqlock.h>
       7                 :            : # include <linux/math64.h>
       8                 :            : # include <linux/time64.h>
       9                 :            : 
      10                 :            : extern struct timezone sys_tz;
      11                 :            : 
      12                 :            : int get_timespec64(struct timespec64 *ts,
      13                 :            :                 const struct __kernel_timespec __user *uts);
      14                 :            : int put_timespec64(const struct timespec64 *ts,
      15                 :            :                 struct __kernel_timespec __user *uts);
      16                 :            : int get_itimerspec64(struct itimerspec64 *it,
      17                 :            :                         const struct __kernel_itimerspec __user *uit);
      18                 :            : int put_itimerspec64(const struct itimerspec64 *it,
      19                 :            :                         struct __kernel_itimerspec __user *uit);
      20                 :            : 
      21                 :            : extern time64_t mktime64(const unsigned int year, const unsigned int mon,
      22                 :            :                         const unsigned int day, const unsigned int hour,
      23                 :            :                         const unsigned int min, const unsigned int sec);
      24                 :            : 
      25                 :            : /* Some architectures do not supply their own clocksource.
      26                 :            :  * This is mainly the case in architectures that get their
      27                 :            :  * inter-tick times by reading the counter on their interval
      28                 :            :  * timer. Since these timers wrap every tick, they're not really
      29                 :            :  * useful as clocksources. Wrapping them to act like one is possible
      30                 :            :  * but not very efficient. So we provide a callout these arches
      31                 :            :  * can implement for use with the jiffies clocksource to provide
      32                 :            :  * finer then tick granular time.
      33                 :            :  */
      34                 :            : #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
      35                 :            : extern u32 (*arch_gettimeoffset)(void);
      36                 :            : #endif
      37                 :            : 
      38                 :            : struct itimerval;
      39                 :            : extern int do_setitimer(int which, struct itimerval *value,
      40                 :            :                         struct itimerval *ovalue);
      41                 :            : extern int do_getitimer(int which, struct itimerval *value);
      42                 :            : 
      43                 :            : extern long do_utimes(int dfd, const char __user *filename, struct timespec64 *times, int flags);
      44                 :            : 
      45                 :            : /*
      46                 :            :  * Similar to the struct tm in userspace <time.h>, but it needs to be here so
      47                 :            :  * that the kernel source is self contained.
      48                 :            :  */
      49                 :            : struct tm {
      50                 :            :         /*
      51                 :            :          * the number of seconds after the minute, normally in the range
      52                 :            :          * 0 to 59, but can be up to 60 to allow for leap seconds
      53                 :            :          */
      54                 :            :         int tm_sec;
      55                 :            :         /* the number of minutes after the hour, in the range 0 to 59*/
      56                 :            :         int tm_min;
      57                 :            :         /* the number of hours past midnight, in the range 0 to 23 */
      58                 :            :         int tm_hour;
      59                 :            :         /* the day of the month, in the range 1 to 31 */
      60                 :            :         int tm_mday;
      61                 :            :         /* the number of months since January, in the range 0 to 11 */
      62                 :            :         int tm_mon;
      63                 :            :         /* the number of years since 1900 */
      64                 :            :         long tm_year;
      65                 :            :         /* the number of days since Sunday, in the range 0 to 6 */
      66                 :            :         int tm_wday;
      67                 :            :         /* the number of days since January 1, in the range 0 to 365 */
      68                 :            :         int tm_yday;
      69                 :            : };
      70                 :            : 
      71                 :            : void time64_to_tm(time64_t totalsecs, int offset, struct tm *result);
      72                 :            : 
      73                 :            : # include <linux/time32.h>
      74                 :            : 
      75                 :          3 : static inline bool itimerspec64_valid(const struct itimerspec64 *its)
      76                 :            : {
      77                 :          3 :         if (!timespec64_valid(&(its->it_interval)) ||
      78                 :            :                 !timespec64_valid(&(its->it_value)))
      79                 :            :                 return false;
      80                 :            : 
      81                 :          3 :         return true;
      82                 :            : }
      83                 :            : 
      84                 :            : /**
      85                 :            :  * time_after32 - compare two 32-bit relative times
      86                 :            :  * @a:  the time which may be after @b
      87                 :            :  * @b:  the time which may be before @a
      88                 :            :  *
      89                 :            :  * time_after32(a, b) returns true if the time @a is after time @b.
      90                 :            :  * time_before32(b, a) returns true if the time @b is before time @a.
      91                 :            :  *
      92                 :            :  * Similar to time_after(), compare two 32-bit timestamps for relative
      93                 :            :  * times.  This is useful for comparing 32-bit seconds values that can't
      94                 :            :  * be converted to 64-bit values (e.g. due to disk format or wire protocol
      95                 :            :  * issues) when it is known that the times are less than 68 years apart.
      96                 :            :  */
      97                 :            : #define time_after32(a, b)      ((s32)((u32)(b) - (u32)(a)) < 0)
      98                 :            : #define time_before32(b, a)     time_after32(a, b)
      99                 :            : 
     100                 :            : /**
     101                 :            :  * time_between32 - check if a 32-bit timestamp is within a given time range
     102                 :            :  * @t:  the time which may be within [l,h]
     103                 :            :  * @l:  the lower bound of the range
     104                 :            :  * @h:  the higher bound of the range
     105                 :            :  *
     106                 :            :  * time_before32(t, l, h) returns true if @l <= @t <= @h. All operands are
     107                 :            :  * treated as 32-bit integers.
     108                 :            :  *
     109                 :            :  * Equivalent to !(time_before32(@t, @l) || time_after32(@t, @h)).
     110                 :            :  */
     111                 :            : #define time_between32(t, l, h) ((u32)(h) - (u32)(l) >= (u32)(t) - (u32)(l))
     112                 :            : #endif