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ea2ce8f351
get/put_timespec64() interfaces will eventually be used for conversions between the new y2038 safe struct __kernel_timespec and struct timespec64. The new y2038 safe syscalls have a common entry for native and compat interfaces. On compat interfaces, the high order bits of nanoseconds should be zeroed out. This is because the application code or the libc do not guarantee zeroing of these. If used without zeroing, kernel might be at risk of using timespec values incorrectly. Note that clearing of bits is dependent on CONFIG_64BIT_TIME for now. This is until COMPAT_USE_64BIT_TIME has been handled correctly. x86 will be the first architecture that will use the CONFIG_64BIT_TIME. Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
99 lines
3.3 KiB
C
99 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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