1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _LINUX_TIME_H 3#define _LINUX_TIME_H 4 5# include <linux/rh_kabi.h> 6# include <linux/cache.h> 7# include RH_KABI_FAKE_INCLUDE(<linux/seqlock.h>) 8# include <linux/math64.h> 9# include <linux/time64.h> 10 11extern struct timezone sys_tz; 12 13int get_timespec64(struct timespec64 *ts, 14 const struct __kernel_timespec __user *uts); 15int put_timespec64(const struct timespec64 *ts, 16 struct __kernel_timespec __user *uts); 17int get_itimerspec64(struct itimerspec64 *it, 18 const struct __kernel_itimerspec __user *uit); 19int put_itimerspec64(const struct itimerspec64 *it, 20 struct __kernel_itimerspec __user *uit); 21 22extern time64_t mktime64(const unsigned int year, const unsigned int mon, 23 const unsigned int day, const unsigned int hour, 24 const unsigned int min, const unsigned int sec); 25 26/* Some architectures do not supply their own clocksource. 27 * This is mainly the case in architectures that get their 28 * inter-tick times by reading the counter on their interval 29 * timer. Since these timers wrap every tick, they're not really 30 * useful as clocksources. Wrapping them to act like one is possible 31 * but not very efficient. So we provide a callout these arches 32 * can implement for use with the jiffies clocksource to provide 33 * finer then tick granular time. 34 */ 35#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET 36extern u32 (*arch_gettimeoffset)(void); 37#endif 38 39struct itimerval; 40extern int do_setitimer(int which, struct itimerval *value, 41 struct itimerval *ovalue); 42extern int do_getitimer(int which, struct itimerval *value); 43 44extern 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 */ 50struct 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 72void time64_to_tm(time64_t totalsecs, int offset, struct tm *result); 73 74# include <linux/time32.h> 75 76static inline bool itimerspec64_valid(const struct itimerspec64 *its) 77{ 78 if (!timespec64_valid(&(its->it_interval)) || 79 !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# include <vdso/time.h> 115 116#endif 117