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TOMOYO Linux Cross Reference
Linux/include/linux/time.h

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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 static inline bool itimerspec64_valid(const struct itimerspec64 *its)
 76 {
 77         if (!timespec64_valid(&(its->it_interval)) ||
 78                 !timespec64_valid(&(its->it_value)))
 79                 return false;
 80 
 81         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 #endif
100 

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