include/linux/time.h

   1 #ifndef _LINUX_TIME_H
   2 #define _LINUX_TIME_H
   3
   4 #include <linux/types.h>
   5
   6 #ifdef __KERNEL__
   7 #include <linux/seqlock.h>
   8 #endif
   9
  10 #ifndef _STRUCT_TIMESPEC
  11 #define _STRUCT_TIMESPEC
  12 struct timespec {
  13         time_t  tv_sec;         /* seconds */
  14         long    tv_nsec;        /* nanoseconds */
  15 };
  16 #endif /* _STRUCT_TIMESPEC */
  17
  18 struct timeval {
  19         time_t          tv_sec;         /* seconds */
  20         suseconds_t     tv_usec;        /* microseconds */
  21 };
  22
  23 struct timezone {
  24         int     tz_minuteswest; /* minutes west of Greenwich */
  25         int     tz_dsttime;     /* type of dst correction */
  26 };
  27
  28 #ifdef __KERNEL__
  29
  30 /* Parameters used to convert the timespec values */
  31 #define MSEC_PER_SEC (1000L)
  32 #define USEC_PER_SEC (1000000L)
  33 #define NSEC_PER_SEC (1000000000L)
  34 #define NSEC_PER_USEC (1000L)
  35
  36 static __inline__ int timespec_equal(struct timespec *a, struct timespec *b)
  37 {
  38         return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
  39 }
  40
  41 extern unsigned long mktime(const unsigned int year, const unsigned int mon,
  42                             const unsigned int day, const unsigned int hour,
  43                             const unsigned int min, const unsigned int sec);
  44
  45 extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
  46
  47 extern struct timespec xtime;
  48 extern struct timespec wall_to_monotonic;
  49 extern seqlock_t xtime_lock;
  50
  51 static inline unsigned long get_seconds(void)
  52 {
  53         return xtime.tv_sec;
  54 }
  55
  56 struct timespec current_kernel_time(void);
  57
  58 #define CURRENT_TIME (current_kernel_time())
  59 #define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 })
  60
  61 extern void do_gettimeofday(struct timeval *tv);
  62 extern int do_settimeofday(struct timespec *tv);
  63 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
  64 extern void clock_was_set(void); // call when ever the clock is set
  65 extern int do_posix_clock_monotonic_gettime(struct timespec *tp);
  66 extern long do_utimes(char __user * filename, struct timeval * times);
  67 struct itimerval;
  68 extern int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue);
  69 extern int do_getitimer(int which, struct itimerval *value);
  70 extern void getnstimeofday (struct timespec *tv);
  71 extern void getnstimestamp(struct timespec *ts);
  72
  73 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
  74
  75 #endif /* __KERNEL__ */
  76
  77 #define NFDBITS                 __NFDBITS
  78
  79 #define FD_SETSIZE              __FD_SETSIZE
  80 #define FD_SET(fd,fdsetp)       __FD_SET(fd,fdsetp)
  81 #define FD_CLR(fd,fdsetp)       __FD_CLR(fd,fdsetp)
  82 #define FD_ISSET(fd,fdsetp)     __FD_ISSET(fd,fdsetp)
  83 #define FD_ZERO(fdsetp)         __FD_ZERO(fdsetp)
  84
  85 /*
  86  * Names of the interval timers, and structure
  87  * defining a timer setting.
  88  */
  89 #define ITIMER_REAL     0
  90 #define ITIMER_VIRTUAL  1
  91 #define ITIMER_PROF     2
  92
  93 struct  itimerspec {
  94         struct  timespec it_interval;    /* timer period */
  95         struct  timespec it_value;       /* timer expiration */
  96 };
  97
  98 struct  itimerval {
  99         struct  timeval it_interval;    /* timer interval */
 100         struct  timeval it_value;       /* current value */
 101 };
 102
 103
 104 /*
 105  * The IDs of the various system clocks (for POSIX.1b interval timers).
 106  */
 107 #define CLOCK_REALTIME           0
 108 #define CLOCK_MONOTONIC          1
 109 #define CLOCK_PROCESS_CPUTIME_ID 2
 110 #define CLOCK_THREAD_CPUTIME_ID  3
 111
 112 /*
 113  * The IDs of various hardware clocks
 114  */
 115
 116
 117 #define CLOCK_SGI_CYCLE 10
 118 #define MAX_CLOCKS 16
 119 #define CLOCKS_MASK  (CLOCK_REALTIME | CLOCK_MONOTONIC)
 120 #define CLOCKS_MONO (CLOCK_MONOTONIC)
 121
 122 /*
 123  * The various flags for setting POSIX.1b interval timers.
 124  */
 125
 126 #define TIMER_ABSTIME 0x01
 127
 128
 129 #endif