include/linux-time.h

   1 #ifndef _SYS_TIME_H
   2 #define _SYS_TIME_H
   3
   4 #pragma ident   "%Z%%M% %I%     %E% SMI"        /* SVr4.0 1.16  */
   5
   6 /*
   7  * Structure returned by gettimeofday(2) system call,
   8  * and used in other calls.
   9  */
  10
  11 #ifdef  __cplusplus
  12 extern "C" {
  13 #endif
  14
  15 #include <linux/time.h>
  16 #include <sys/linux-types.h>
  17
  18 extern unsigned long long monotonic_clock(void);
  19 typedef struct timespec timestruc_t;    /* definition per SVr4 */
  20 typedef longlong_t      hrtime_t;
  21
  22 #define TIME32_MAX      INT32_MAX
  23 #define TIME32_MIN      INT32_MIN
  24
  25 #define SEC             1
  26 #define MILLISEC        1000
  27 #define MICROSEC        1000000
  28 #define NANOSEC         1000000000
  29
  30 #define hz                                      \
  31 ({                                              \
  32         BUG_ON(HZ < 100 || HZ > MICROSEC);      \
  33         HZ;                                     \
  34 })
  35
  36 #define gethrestime(ts) getnstimeofday((ts))
  37
  38 static __inline__ hrtime_t
  39 gethrtime(void) {
  40         /* BUG_ON(cur_timer == timer_none); */
  41
  42         /* Solaris expects a long long here but monotonic_clock() returns an
  43          * unsigned long long.  Note that monotonic_clock() returns the number
  44          * of nanoseconds passed since kernel initialization.  Even for a signed
  45          * long long this will not "go negative" for ~292 years.
  46          */
  47         return monotonic_clock();
  48 }
  49
  50 static __inline__ time_t
  51 gethrestime_sec(void)
  52 {
  53         timestruc_t now;
  54
  55         gethrestime(&now);
  56         return (now.tv_sec);
  57 }
  58
  59
  60 #ifdef  __cplusplus
  61 }
  62 #endif
  63
  64 #endif  /* _SYS_TIME_H */