LXR linux/include/linux/time.h

   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
 103