Line data    Source code

       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/math64.h>
       7             : # include <linux/time64.h>
       8             : 
       9             : extern struct timezone sys_tz;
      10             : 
      11             : int get_timespec64(struct timespec64 *ts,
      12             :                 const struct __kernel_timespec __user *uts);
      13             : int put_timespec64(const struct timespec64 *ts,
      14             :                 struct __kernel_timespec __user *uts);
      15             : int get_itimerspec64(struct itimerspec64 *it,
      16             :                         const struct __kernel_itimerspec __user *uit);
      17             : int put_itimerspec64(const struct itimerspec64 *it,
      18             :                         struct __kernel_itimerspec __user *uit);
      19             : 
      20             : extern time64_t mktime64(const unsigned int year, const unsigned int mon,
      21             :                         const unsigned int day, const unsigned int hour,
      22             :                         const unsigned int min, const unsigned int sec);
      23             : 
      24             : #ifdef CONFIG_POSIX_TIMERS
      25             : extern void clear_itimer(void);
      26             : #else
      27             : static inline void clear_itimer(void) {}
      28             : #endif
      29             : 
      30             : extern long do_utimes(int dfd, const char __user *filename, struct timespec64 *times, int flags);
      31             : 
      32             : /*
      33             :  * Similar to the struct tm in userspace <time.h>, but it needs to be here so
      34             :  * that the kernel source is self contained.
      35             :  */
      36             : struct tm {
      37             :         /*
      38             :          * the number of seconds after the minute, normally in the range
      39             :          * 0 to 59, but can be up to 60 to allow for leap seconds
      40             :          */
      41             :         int tm_sec;
      42             :         /* the number of minutes after the hour, in the range 0 to 59*/
      43             :         int tm_min;
      44             :         /* the number of hours past midnight, in the range 0 to 23 */
      45             :         int tm_hour;
      46             :         /* the day of the month, in the range 1 to 31 */
      47             :         int tm_mday;
      48             :         /* the number of months since January, in the range 0 to 11 */
      49             :         int tm_mon;
      50             :         /* the number of years since 1900 */
      51             :         long tm_year;
      52             :         /* the number of days since Sunday, in the range 0 to 6 */
      53             :         int tm_wday;
      54             :         /* the number of days since January 1, in the range 0 to 365 */
      55             :         int tm_yday;
      56             : };
      57             : 
      58             : void time64_to_tm(time64_t totalsecs, int offset, struct tm *result);
      59             : 
      60             : # include <linux/time32.h>
      61             : 
      62             : static inline bool itimerspec64_valid(const struct itimerspec64 *its)
      63             : {
      64           0 :         if (!timespec64_valid(&(its->it_interval)) ||
      65           0 :                 !timespec64_valid(&(its->it_value)))
      66             :                 return false;
      67             : 
      68             :         return true;
      69             : }
      70             : 
      71             : /**
      72             :  * time_after32 - compare two 32-bit relative times
      73             :  * @a:  the time which may be after @b
      74             :  * @b:  the time which may be before @a
      75             :  *
      76             :  * time_after32(a, b) returns true if the time @a is after time @b.
      77             :  * time_before32(b, a) returns true if the time @b is before time @a.
      78             :  *
      79             :  * Similar to time_after(), compare two 32-bit timestamps for relative
      80             :  * times.  This is useful for comparing 32-bit seconds values that can't
      81             :  * be converted to 64-bit values (e.g. due to disk format or wire protocol
      82             :  * issues) when it is known that the times are less than 68 years apart.
      83             :  */
      84             : #define time_after32(a, b)      ((s32)((u32)(b) - (u32)(a)) < 0)
      85             : #define time_before32(b, a)     time_after32(a, b)
      86             : 
      87             : /**
      88             :  * time_between32 - check if a 32-bit timestamp is within a given time range
      89             :  * @t:  the time which may be within [l,h]
      90             :  * @l:  the lower bound of the range
      91             :  * @h:  the higher bound of the range
      92             :  *
      93             :  * time_before32(t, l, h) returns true if @l <= @t <= @h. All operands are
      94             :  * treated as 32-bit integers.
      95             :  *
      96             :  * Equivalent to !(time_before32(@t, @l) || time_after32(@t, @h)).
      97             :  */
      98             : #define time_between32(t, l, h) ((u32)(h) - (u32)(l) >= (u32)(t) - (u32)(l))
      99             : 
     100             : # include <vdso/time.h>
     101             : 
     102             : #endif