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