include/uapi/linux/time.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 #ifndef _UAPI_LINUX_TIME_H
   3 #define _UAPI_LINUX_TIME_H
   4
   5 #include <linux/types.h>
   6
   7
   8 #ifndef _STRUCT_TIMESPEC
   9 #define _STRUCT_TIMESPEC
  10 struct timespec {
  11         __kernel_time_t tv_sec;                 /* seconds */
  12         long            tv_nsec;                /* nanoseconds */
  13 };
  14 #endif
  15
  16 struct timeval {
  17         __kernel_time_t         tv_sec;         /* seconds */
  18         __kernel_suseconds_t    tv_usec;        /* microseconds */
  19 };
  20
  21 struct timezone {
  22         int     tz_minuteswest; /* minutes west of Greenwich */
  23         int     tz_dsttime;     /* type of dst correction */
  24 };
  25
  26
  27 /*
  28  * Names of the interval timers, and structure
  29  * defining a timer setting:
  30  */
  31 #define ITIMER_REAL             0
  32 #define ITIMER_VIRTUAL          1
  33 #define ITIMER_PROF             2
  34
  35 struct itimerspec {
  36         struct timespec it_interval;    /* timer period */
  37         struct timespec it_value;       /* timer expiration */
  38 };
  39
  40 struct itimerval {
  41         struct timeval it_interval;     /* timer interval */
  42         struct timeval it_value;        /* current value */
  43 };
  44
  45 /*
  46  * The IDs of the various system clocks (for POSIX.1b interval timers):
  47  */
  48 #define CLOCK_REALTIME                  0
  49 #define CLOCK_MONOTONIC                 1
  50 #define CLOCK_PROCESS_CPUTIME_ID        2
  51 #define CLOCK_THREAD_CPUTIME_ID         3
  52 #define CLOCK_MONOTONIC_RAW             4
  53 #define CLOCK_REALTIME_COARSE           5
  54 #define CLOCK_MONOTONIC_COARSE          6
  55 #define CLOCK_BOOTTIME                  7
  56 #define CLOCK_REALTIME_ALARM            8
  57 #define CLOCK_BOOTTIME_ALARM            9
  58 /*
  59  * The driver implementing this got removed. The clock ID is kept as a
  60  * place holder. Do not reuse!
  61  */
  62 #define CLOCK_SGI_CYCLE                 10
  63 #define CLOCK_TAI                       11
  64
  65 #define MAX_CLOCKS                      16
  66 #define CLOCKS_MASK                     (CLOCK_REALTIME | CLOCK_MONOTONIC)
  67 #define CLOCKS_MONO                     CLOCK_MONOTONIC
  68
  69 /*
  70  * The various flags for setting POSIX.1b interval timers:
  71  */
  72 #define TIMER_ABSTIME                   0x01
  73
  74 #endif /* _UAPI_LINUX_TIME_H */