time.h (3216B)
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 9extern struct timezone sys_tz; 10 11int get_timespec64(struct timespec64 *ts, 12 const struct __kernel_timespec __user *uts); 13int put_timespec64(const struct timespec64 *ts, 14 struct __kernel_timespec __user *uts); 15int get_itimerspec64(struct itimerspec64 *it, 16 const struct __kernel_itimerspec __user *uit); 17int put_itimerspec64(const struct itimerspec64 *it, 18 struct __kernel_itimerspec __user *uit); 19 20extern 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 25extern void clear_itimer(void); 26#else 27static inline void clear_itimer(void) {} 28#endif 29 30extern 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 */ 36struct 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 58void time64_to_tm(time64_t totalsecs, int offset, struct tm *result); 59 60# include <linux/time32.h> 61 62static inline bool itimerspec64_valid(const struct itimerspec64 *its) 63{ 64 if (!timespec64_valid(&(its->it_interval)) || 65 !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