308 lines
8.8 KiB
C
308 lines
8.8 KiB
C
#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,
|
|
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,
|
|
lhs.tv_nsec - rhs.tv_nsec);
|
|
return ts_delta;
|
|
}
|
|
|
|
/*
|
|
* Returns true if the timespec is norm, false if denorm:
|
|
*/
|
|
#define timespec_valid(ts) \
|
|
(((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
|
|
|
|
extern seqlock_t xtime_lock;
|
|
|
|
extern void read_persistent_clock(struct timespec *ts);
|
|
extern void read_boot_clock(struct timespec *ts);
|
|
extern int update_persistent_clock(struct timespec now);
|
|
extern int no_sync_cmos_clock __read_mostly;
|
|
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_wall_to_monotonic(void); /* does not take xtime_lock */
|
|
struct timespec get_monotonic_coarse(void);
|
|
|
|
#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(struct timespec *tv);
|
|
extern int do_sys_settimeofday(struct timespec *tv, 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 getboottime(struct timespec *ts);
|
|
extern void monotonic_to_bootbased(struct timespec *ts);
|
|
|
|
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 update_wall_time(void);
|
|
extern void timekeeping_leap_insert(int leapsecond);
|
|
|
|
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__ */
|
|
|
|
#define NFDBITS __NFDBITS
|
|
|
|
#define FD_SETSIZE __FD_SETSIZE
|
|
#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
|
|
#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
|
|
#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
|
|
#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
|
|
|
|
/*
|
|
* 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
|
|
|
|
/*
|
|
* 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
|