diff options
Diffstat (limited to 'include/linux/time.h')
| -rw-r--r-- | include/linux/time.h | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/include/linux/time.h b/include/linux/time.h new file mode 100644 index 000000000000..5634497ff5df --- /dev/null +++ b/include/linux/time.h @@ -0,0 +1,181 @@ +#ifndef _LINUX_TIME_H +#define _LINUX_TIME_H + +#include <linux/types.h> + +#ifdef __KERNEL__ +#include <linux/seqlock.h> +#endif + +#ifndef _STRUCT_TIMESPEC +#define _STRUCT_TIMESPEC +struct timespec { + time_t tv_sec; /* seconds */ + long tv_nsec; /* nanoseconds */ +}; +#endif /* _STRUCT_TIMESPEC */ + +struct timeval { + time_t tv_sec; /* seconds */ + suseconds_t tv_usec; /* microseconds */ +}; + +struct timezone { + int tz_minuteswest; /* minutes west of Greenwich */ + int tz_dsttime; /* type of dst correction */ +}; + +#ifdef __KERNEL__ + +/* Parameters used to convert the timespec values */ +#ifndef USEC_PER_SEC +#define USEC_PER_SEC (1000000L) +#endif + +#ifndef NSEC_PER_SEC +#define NSEC_PER_SEC (1000000000L) +#endif + +#ifndef NSEC_PER_USEC +#define NSEC_PER_USEC (1000L) +#endif + +static __inline__ int timespec_equal(struct timespec *a, struct timespec *b) +{ + return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); +} + +/* Converts Gregorian date to seconds since 1970-01-01 00:00:00. + * Assumes input in normal date format, i.e. 1980-12-31 23:59:59 + * => year=1980, mon=12, day=31, hour=23, min=59, sec=59. + * + * [For the Julian calendar (which was used in Russia before 1917, + * Britain & colonies before 1752, anywhere else before 1582, + * and is still in use by some communities) leave out the + * -year/100+year/400 terms, and add 10.] + * + * This algorithm was first published by Gauss (I think). + * + * WARNING: this function will overflow on 2106-02-07 06:28:16 on + * machines were long is 32-bit! (However, as time_t is signed, we + * will already get problems at other places on 2038-01-19 03:14:08) + */ +static inline unsigned long +mktime (unsigned int year, unsigned int mon, + unsigned int day, unsigned int hour, + unsigned int min, unsigned int sec) +{ + if (0 >= (int) (mon -= 2)) { /* 1..12 -> 11,12,1..10 */ + mon += 12; /* Puts Feb last since it has leap day */ + year -= 1; + } + + return ((( + (unsigned long) (year/4 - year/100 + year/400 + 367*mon/12 + day) + + year*365 - 719499 + )*24 + hour /* now have hours */ + )*60 + min /* now have minutes */ + )*60 + sec; /* finally seconds */ +} + +extern struct timespec xtime; +extern struct timespec wall_to_monotonic; +extern seqlock_t xtime_lock; + +static inline unsigned long get_seconds(void) +{ + return xtime.tv_sec; +} + +struct timespec current_kernel_time(void); + +#define CURRENT_TIME (current_kernel_time()) +#define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 }) + +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); +extern void clock_was_set(void); // call when ever the clock is set +extern int do_posix_clock_monotonic_gettime(struct timespec *tp); +extern long do_nanosleep(struct timespec *t); +extern long do_utimes(char __user * filename, struct timeval * times); +struct itimerval; +extern int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue); +extern int do_getitimer(int which, struct itimerval *value); +extern void getnstimeofday (struct timespec *tv); + +extern struct timespec timespec_trunc(struct timespec t, unsigned gran); + +static inline void +set_normalized_timespec (struct timespec *ts, time_t sec, long nsec) +{ + while (nsec > NSEC_PER_SEC) { + nsec -= NSEC_PER_SEC; + ++sec; + } + while (nsec < 0) { + nsec += NSEC_PER_SEC; + --sec; + } + ts->tv_sec = sec; + ts->tv_nsec = nsec; +} + +#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_REALTIME_HR 4 +#define CLOCK_MONOTONIC_HR 5 + +/* + * The IDs of various hardware clocks + */ + + +#define CLOCK_SGI_CYCLE 10 +#define MAX_CLOCKS 16 +#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC | \ + CLOCK_REALTIME_HR | CLOCK_MONOTONIC_HR) +#define CLOCKS_MONO (CLOCK_MONOTONIC & CLOCK_MONOTONIC_HR) + +/* + * The various flags for setting POSIX.1b interval timers. + */ + +#define TIMER_ABSTIME 0x01 + + +#endif |