blob: 27d83fd2ae6146a615fec51f9fa01660f86fa13d [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_TIME_H
#define _LINUX_TIME_H
# include <linux/cache.h>
# include <linux/seqlock.h>
# include <linux/math64.h>
# include <linux/time64.h>
extern struct timezone sys_tz;
int get_timespec64(struct timespec64 *ts,
const struct __kernel_timespec __user *uts);
int put_timespec64(const struct timespec64 *ts,
struct __kernel_timespec __user *uts);
int get_itimerspec64(struct itimerspec64 *it,
const struct __kernel_itimerspec __user *uit);
int put_itimerspec64(const struct itimerspec64 *it,
struct __kernel_itimerspec __user *uit);
extern time64_t mktime64(const unsigned int year, const unsigned int mon,
const unsigned int day, const unsigned int hour,
const unsigned int min, const unsigned int sec);
/* Some architectures do not supply their own clocksource.
* This is mainly the case in architectures that get their
* inter-tick times by reading the counter on their interval
* timer. Since these timers wrap every tick, they're not really
* useful as clocksources. Wrapping them to act like one is possible
* but not very efficient. So we provide a callout these arches
* can implement for use with the jiffies clocksource to provide
* finer then tick granular time.
extern u32 (*arch_gettimeoffset)(void);
struct itimerval;
extern int do_setitimer(int which, struct itimerval *value,
struct itimerval *ovalue);
extern int do_getitimer(int which, struct itimerval *value);
extern long do_utimes(int dfd, const char __user *filename, struct timespec64 *times, int flags);
* Similar to the struct tm in userspace <time.h>, but it needs to be here so
* that the kernel source is self contained.
struct tm {
* the number of seconds after the minute, normally in the range
* 0 to 59, but can be up to 60 to allow for leap seconds
int tm_sec;
/* the number of minutes after the hour, in the range 0 to 59*/
int tm_min;
/* the number of hours past midnight, in the range 0 to 23 */
int tm_hour;
/* the day of the month, in the range 1 to 31 */
int tm_mday;
/* the number of months since January, in the range 0 to 11 */
int tm_mon;
/* the number of years since 1900 */
long tm_year;
/* the number of days since Sunday, in the range 0 to 6 */
int tm_wday;
/* the number of days since January 1, in the range 0 to 365 */
int tm_yday;
void time64_to_tm(time64_t totalsecs, int offset, struct tm *result);
# include <linux/time32.h>
static inline bool itimerspec64_valid(const struct itimerspec64 *its)
if (!timespec64_valid(&(its->it_interval)) ||
return false;
return true;
* time_after32 - compare two 32-bit relative times
* @a: the time which may be after @b
* @b: the time which may be before @a
* time_after32(a, b) returns true if the time @a is after time @b.
* time_before32(b, a) returns true if the time @b is before time @a.
* Similar to time_after(), compare two 32-bit timestamps for relative
* times. This is useful for comparing 32-bit seconds values that can't
* be converted to 64-bit values (e.g. due to disk format or wire protocol
* issues) when it is known that the times are less than 68 years apart.
#define time_after32(a, b) ((s32)((u32)(b) - (u32)(a)) < 0)
#define time_before32(b, a) time_after32(a, b)