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
11struct timespec {
12 __kernel_old_time_t tv_sec; /* seconds */
13 long tv_nsec; /* nanoseconds */
14};
15#endif
16
17struct timeval {
18 __kernel_old_time_t tv_sec; /* seconds */
19 __kernel_suseconds_t tv_usec; /* microseconds */
20};
21
22struct itimerspec {
23 struct timespec it_interval;/* timer period */
24 struct timespec it_value; /* timer expiration */
25};
26
27struct itimerval {
28 struct timeval it_interval;/* timer interval */
29 struct timeval it_value; /* current value */
30};
31#endif
32
33struct 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
68/*
69 * AUX clock support. AUXiliary clocks are dynamically configured by
70 * enabling a clock ID. These clock can be steered independently of the
71 * core timekeeper. The kernel can support up to 8 auxiliary clocks, but
72 * the actual limit depends on eventual architecture constraints vs. VDSO.
73 */
74#define CLOCK_AUX MAX_CLOCKS
75#define MAX_AUX_CLOCKS 8
76#define CLOCK_AUX_LAST (CLOCK_AUX + MAX_AUX_CLOCKS - 1)
77
78#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
79#define CLOCKS_MONO CLOCK_MONOTONIC
80
81/*
82 * The various flags for setting POSIX.1b interval timers:
83 */
84#define TIMER_ABSTIME 0x01
85
86#endif /* _UAPI_LINUX_TIME_H */
87