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