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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 : : #ifdef CONFIG_POSIX_TIMERS 39 : : extern void clear_itimer(void); 40 : : #else 41 : : static inline void clear_itimer(void) {} 42 : : #endif 43 : : 44 : : extern long do_utimes(int dfd, const char __user *filename, struct timespec64 *times, int flags); 45 : : 46 : : /* 47 : : * Similar to the struct tm in userspace <time.h>, but it needs to be here so 48 : : * that the kernel source is self contained. 49 : : */ 50 : : struct tm { 51 : : /* 52 : : * the number of seconds after the minute, normally in the range 53 : : * 0 to 59, but can be up to 60 to allow for leap seconds 54 : : */ 55 : : int tm_sec; 56 : : /* the number of minutes after the hour, in the range 0 to 59*/ 57 : : int tm_min; 58 : : /* the number of hours past midnight, in the range 0 to 23 */ 59 : : int tm_hour; 60 : : /* the day of the month, in the range 1 to 31 */ 61 : : int tm_mday; 62 : : /* the number of months since January, in the range 0 to 11 */ 63 : : int tm_mon; 64 : : /* the number of years since 1900 */ 65 : : long tm_year; 66 : : /* the number of days since Sunday, in the range 0 to 6 */ 67 : : int tm_wday; 68 : : /* the number of days since January 1, in the range 0 to 365 */ 69 : : int tm_yday; 70 : : }; 71 : : 72 : : void time64_to_tm(time64_t totalsecs, int offset, struct tm *result); 73 : : 74 : : # include <linux/time32.h> 75 : : 76 : 16437 : static inline bool itimerspec64_valid(const struct itimerspec64 *its) 77 : : { 78 [ + - ]: 16437 : if (!timespec64_valid(&(its->it_interval)) || 79 [ + - ]: 16437 : !timespec64_valid(&(its->it_value))) 80 : : return false; 81 : : 82 : : return true; 83 : : } 84 : : 85 : : /** 86 : : * time_after32 - compare two 32-bit relative times 87 : : * @a: the time which may be after @b 88 : : * @b: the time which may be before @a 89 : : * 90 : : * time_after32(a, b) returns true if the time @a is after time @b. 91 : : * time_before32(b, a) returns true if the time @b is before time @a. 92 : : * 93 : : * Similar to time_after(), compare two 32-bit timestamps for relative 94 : : * times. This is useful for comparing 32-bit seconds values that can't 95 : : * be converted to 64-bit values (e.g. due to disk format or wire protocol 96 : : * issues) when it is known that the times are less than 68 years apart. 97 : : */ 98 : : #define time_after32(a, b) ((s32)((u32)(b) - (u32)(a)) < 0) 99 : : #define time_before32(b, a) time_after32(a, b) 100 : : 101 : : /** 102 : : * time_between32 - check if a 32-bit timestamp is within a given time range 103 : : * @t: the time which may be within [l,h] 104 : : * @l: the lower bound of the range 105 : : * @h: the higher bound of the range 106 : : * 107 : : * time_before32(t, l, h) returns true if @l <= @t <= @h. All operands are 108 : : * treated as 32-bit integers. 109 : : * 110 : : * Equivalent to !(time_before32(@t, @l) || time_after32(@t, @h)). 111 : : */ 112 : : #define time_between32(t, l, h) ((u32)(h) - (u32)(l) >= (u32)(t) - (u32)(l)) 113 : : 114 : : struct timens_offset { 115 : : s64 sec; 116 : : u64 nsec; 117 : : }; 118 : : 119 : : #endif