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  1. #ifndef _UAPI_LINUX_TIME_H
  2. #define _UAPI_LINUX_TIME_H
  3.  
  4. #include <linux/types.h>
  5.  
  6.  
  7. #ifndef _STRUCT_TIMESPEC
  8. #define _STRUCT_TIMESPEC
  9. struct timespec {
  10.         __kernel_time_t tv_sec;                 /* seconds */
  11.         long            tv_nsec;                /* nanoseconds */
  12. };
  13. #endif
  14.  
  15. struct timeval {
  16.         __kernel_time_t         tv_sec;         /* seconds */
  17.         __kernel_suseconds_t    tv_usec;        /* microseconds */
  18. };
  19.  
  20. struct timezone {
  21.         int     tz_minuteswest; /* minutes west of Greenwich */
  22.         int     tz_dsttime;     /* type of dst correction */
  23. };
  24.  
  25.  
  26. /*
  27.  * Names of the interval timers, and structure
  28.  * defining a timer setting:
  29.  */
  30. #define ITIMER_REAL             0
  31. #define ITIMER_VIRTUAL          1
  32. #define ITIMER_PROF             2
  33.  
  34. struct itimerspec {
  35.         struct timespec it_interval;    /* timer period */
  36.         struct timespec it_value;       /* timer expiration */
  37. };
  38.  
  39. struct itimerval {
  40.         struct timeval it_interval;     /* timer interval */
  41.         struct timeval it_value;        /* current value */
  42. };
  43.  
  44. /*
  45.  * The IDs of the various system clocks (for POSIX.1b interval timers):
  46.  */
  47. #define CLOCK_REALTIME                  0
  48. #define CLOCK_MONOTONIC                 1
  49. #define CLOCK_PROCESS_CPUTIME_ID        2
  50. #define CLOCK_THREAD_CPUTIME_ID         3
  51. #define CLOCK_MONOTONIC_RAW             4
  52. #define CLOCK_REALTIME_COARSE           5
  53. #define CLOCK_MONOTONIC_COARSE          6
  54. #define CLOCK_BOOTTIME                  7
  55. #define CLOCK_REALTIME_ALARM            8
  56. #define CLOCK_BOOTTIME_ALARM            9
  57. #define CLOCK_SGI_CYCLE                 10      /* Hardware specific */
  58. #define CLOCK_TAI                       11
  59.  
  60. #define MAX_CLOCKS                      16
  61. #define CLOCKS_MASK                     (CLOCK_REALTIME | CLOCK_MONOTONIC)
  62. #define CLOCKS_MONO                     CLOCK_MONOTONIC
  63.  
  64. /*
  65.  * The various flags for setting POSIX.1b interval timers:
  66.  */
  67. #define TIMER_ABSTIME                   0x01
  68.  
  69. #endif /* _UAPI_LINUX_TIME_H */
  70.