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- #ifndef _LINUX_TIME_H
- #define _LINUX_TIME_H
- #include <linux/types.h>
- #ifdef __KERNEL__
- # include <linux/cache.h>
- # include <linux/seqlock.h>
- # include <linux/math64.h>
- #endif
- #ifndef _STRUCT_TIMESPEC
- #define _STRUCT_TIMESPEC
- struct timespec {
- __kernel_time_t tv_sec; /* seconds */
- long tv_nsec; /* nanoseconds */
- };
- #endif
- struct timeval {
- __kernel_time_t tv_sec; /* seconds */
- __kernel_suseconds_t tv_usec; /* microseconds */
- };
- struct timezone {
- int tz_minuteswest; /* minutes west of Greenwich */
- int tz_dsttime; /* type of dst correction */
- };
- #ifdef __KERNEL__
- extern struct timezone sys_tz;
- /* Parameters used to convert the timespec values: */
- #define MSEC_PER_SEC 1000L
- #define USEC_PER_MSEC 1000L
- #define NSEC_PER_USEC 1000L
- #define NSEC_PER_MSEC 1000000L
- #define USEC_PER_SEC 1000000L
- #define NSEC_PER_SEC 1000000000L
- #define FSEC_PER_SEC 1000000000000000LL
- #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
- static inline int timespec_equal(const struct timespec *a,
- const struct timespec *b)
- {
- return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
- }
- /*
- * lhs < rhs: return <0
- * lhs == rhs: return 0
- * lhs > rhs: return >0
- */
- static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
- {
- if (lhs->tv_sec < rhs->tv_sec)
- return -1;
- if (lhs->tv_sec > rhs->tv_sec)
- return 1;
- return lhs->tv_nsec - rhs->tv_nsec;
- }
- static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
- {
- if (lhs->tv_sec < rhs->tv_sec)
- return -1;
- if (lhs->tv_sec > rhs->tv_sec)
- return 1;
- return lhs->tv_usec - rhs->tv_usec;
- }
- extern unsigned long mktime(const unsigned int year, const unsigned int mon,
- const unsigned int day, const unsigned int hour,
- const unsigned int min, const unsigned int sec);
- extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
- /*
- * timespec_add_safe assumes both values are positive and checks
- * for overflow. It will return TIME_T_MAX if the reutrn would be
- * smaller then either of the arguments.
- */
- extern struct timespec timespec_add_safe(const struct timespec lhs,
- const struct timespec rhs);
- static inline struct timespec timespec_add(struct timespec lhs,
- struct timespec rhs)
- {
- struct timespec ts_delta;
- set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec,
- (s64)lhs.tv_nsec + rhs.tv_nsec);
- return ts_delta;
- }
- /*
- * sub = lhs - rhs, in normalized form
- */
- static inline struct timespec timespec_sub(struct timespec lhs,
- struct timespec rhs)
- {
- struct timespec ts_delta;
- set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
- (s64)lhs.tv_nsec - rhs.tv_nsec);
- return ts_delta;
- }
- #define KTIME_MAX ((s64)~((u64)1 << 63))
- #if (BITS_PER_LONG == 64)
- # define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
- #else
- # define KTIME_SEC_MAX LONG_MAX
- #endif
- /*
- * Returns true if the timespec is norm, false if denorm:
- */
- static inline bool timespec_valid(const struct timespec *ts)
- {
- /* Dates before 1970 are bogus */
- if (ts->tv_sec < 0)
- return false;
- /* Can't have more nanoseconds then a second */
- if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
- return false;
- return true;
- }
- static inline bool timespec_valid_strict(const struct timespec *ts)
- {
- if (!timespec_valid(ts))
- return false;
- /* Disallow values that could overflow ktime_t */
- if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
- return false;
- return true;
- }
- extern void read_persistent_clock(struct timespec *ts);
- extern void read_boot_clock(struct timespec *ts);
- extern int update_persistent_clock(struct timespec now);
- void timekeeping_init(void);
- extern int timekeeping_suspended;
- unsigned long get_seconds(void);
- struct timespec current_kernel_time(void);
- struct timespec __current_kernel_time(void); /* does not take xtime_lock */
- struct timespec get_monotonic_coarse(void);
- void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
- struct timespec *wtom, struct timespec *sleep);
- void timekeeping_inject_sleeptime(struct timespec *delta);
- #define CURRENT_TIME (current_kernel_time())
- #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
- /* 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.
- */
- #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
- extern u32 arch_gettimeoffset(void);
- #else
- static inline u32 arch_gettimeoffset(void) { return 0; }
- #endif
- extern void do_gettimeofday(struct timeval *tv);
- extern int do_settimeofday(const struct timespec *tv);
- extern int do_sys_settimeofday(const struct timespec *tv,
- const struct timezone *tz);
- #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
- extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
- struct itimerval;
- extern int do_setitimer(int which, struct itimerval *value,
- struct itimerval *ovalue);
- extern unsigned int alarm_setitimer(unsigned int seconds);
- extern int do_getitimer(int which, struct itimerval *value);
- extern void getnstimeofday(struct timespec *tv);
- extern void getrawmonotonic(struct timespec *ts);
- extern void getnstime_raw_and_real(struct timespec *ts_raw,
- struct timespec *ts_real);
- extern void getboottime(struct timespec *ts);
- extern void monotonic_to_bootbased(struct timespec *ts);
- extern void get_monotonic_boottime(struct timespec *ts);
- static inline bool timeval_valid(const struct timeval *tv)
- {
- /* Dates before 1970 are bogus */
- if (tv->tv_sec < 0)
- return false;
- /* Can't have more microseconds then a second */
- if (tv->tv_usec < 0 || tv->tv_usec >= USEC_PER_SEC)
- return false;
- return true;
- }
- extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
- extern int timekeeping_valid_for_hres(void);
- extern u64 timekeeping_max_deferment(void);
- extern void timekeeping_leap_insert(int leapsecond);
- extern int timekeeping_inject_offset(struct timespec *ts);
- struct tms;
- extern void do_sys_times(struct tms *);
- /*
- * 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 time_to_tm(time_t totalsecs, int offset, struct tm *result);
- /**
- * timespec_to_ns - Convert timespec to nanoseconds
- * @ts: pointer to the timespec variable to be converted
- *
- * Returns the scalar nanosecond representation of the timespec
- * parameter.
- */
- static inline s64 timespec_to_ns(const struct timespec *ts)
- {
- return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
- }
- /**
- * timeval_to_ns - Convert timeval to nanoseconds
- * @ts: pointer to the timeval variable to be converted
- *
- * Returns the scalar nanosecond representation of the timeval
- * parameter.
- */
- static inline s64 timeval_to_ns(const struct timeval *tv)
- {
- return ((s64) tv->tv_sec * NSEC_PER_SEC) +
- tv->tv_usec * NSEC_PER_USEC;
- }
- /**
- * ns_to_timespec - Convert nanoseconds to timespec
- * @nsec: the nanoseconds value to be converted
- *
- * Returns the timespec representation of the nsec parameter.
- */
- extern struct timespec ns_to_timespec(const s64 nsec);
- /**
- * ns_to_timeval - Convert nanoseconds to timeval
- * @nsec: the nanoseconds value to be converted
- *
- * Returns the timeval representation of the nsec parameter.
- */
- extern struct timeval ns_to_timeval(const s64 nsec);
- /**
- * timespec_add_ns - Adds nanoseconds to a timespec
- * @a: pointer to timespec to be incremented
- * @ns: unsigned nanoseconds value to be added
- *
- * This must always be inlined because its used from the x86-64 vdso,
- * which cannot call other kernel functions.
- */
- static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
- {
- a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
- a->tv_nsec = ns;
- }
- #endif /* __KERNEL__ */
- /*
- * Names of the interval timers, and structure
- * defining a timer setting:
- */
- #define ITIMER_REAL 0
- #define ITIMER_VIRTUAL 1
- #define ITIMER_PROF 2
- struct itimerspec {
- struct timespec it_interval; /* timer period */
- struct timespec it_value; /* timer expiration */
- };
- struct itimerval {
- struct timeval it_interval; /* timer interval */
- struct timeval it_value; /* current value */
- };
- /*
- * The IDs of the various system clocks (for POSIX.1b interval timers):
- */
- #define CLOCK_REALTIME 0
- #define CLOCK_MONOTONIC 1
- #define CLOCK_PROCESS_CPUTIME_ID 2
- #define CLOCK_THREAD_CPUTIME_ID 3
- #define CLOCK_MONOTONIC_RAW 4
- #define CLOCK_REALTIME_COARSE 5
- #define CLOCK_MONOTONIC_COARSE 6
- #define CLOCK_BOOTTIME 7
- #define CLOCK_REALTIME_ALARM 8
- #define CLOCK_BOOTTIME_ALARM 9
- /*
- * The IDs of various hardware clocks:
- */
- #define CLOCK_SGI_CYCLE 10
- #define MAX_CLOCKS 16
- #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
- #define CLOCKS_MONO CLOCK_MONOTONIC
- /*
- * The various flags for setting POSIX.1b interval timers:
- */
- #define TIMER_ABSTIME 0x01
- #endif
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