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
10struct timespec {
11 __kernel_time_t tv_sec; /* seconds */
12 long tv_nsec; /* nanoseconds */
13};
14#endif
15
16struct timeval {
17 __kernel_time_t tv_sec; /* seconds */
18 __kernel_suseconds_t tv_usec; /* microseconds */
19};
20
21struct 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
35struct itimerspec {
36 struct timespec it_interval; /* timer period */
37 struct timespec it_value; /* timer expiration */
38};
39
40struct itimerval {
41 struct timeval it_interval; /* timer interval */
42 struct timeval it_value; /* current value */
43};
44
45#ifndef __kernel_timespec
46struct __kernel_timespec {
47 __kernel_time64_t tv_sec; /* seconds */
48 long long tv_nsec; /* nanoseconds */
49};
50#endif
51
52#ifndef __kernel_itimerspec
53struct __kernel_itimerspec {
54 struct __kernel_timespec it_interval; /* timer period */
55 struct __kernel_timespec it_value; /* timer expiration */
56};
57#endif
58
59/*
60 * legacy timeval structure, only embedded in structures that
61 * traditionally used 'timeval' to pass time intervals (not absolute
62 * times). Do not add new users. If user space fails to compile
63 * here, this is probably because it is not y2038 safe and needs to
64 * be changed to use another interface.
65 */
66struct __kernel_old_timeval {
67 __kernel_long_t tv_sec;
68 __kernel_long_t tv_usec;
69};
70
71/*
72 * The IDs of the various system clocks (for POSIX.1b interval timers):
73 */
74#define CLOCK_REALTIME 0
75#define CLOCK_MONOTONIC 1
76#define CLOCK_PROCESS_CPUTIME_ID 2
77#define CLOCK_THREAD_CPUTIME_ID 3
78#define CLOCK_MONOTONIC_RAW 4
79#define CLOCK_REALTIME_COARSE 5
80#define CLOCK_MONOTONIC_COARSE 6
81#define CLOCK_BOOTTIME 7
82#define CLOCK_REALTIME_ALARM 8
83#define CLOCK_BOOTTIME_ALARM 9
84/*
85 * The driver implementing this got removed. The clock ID is kept as a
86 * place holder. Do not reuse!
87 */
88#define CLOCK_SGI_CYCLE 10
89#define CLOCK_TAI 11
90
91#define MAX_CLOCKS 16
92#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
93#define CLOCKS_MONO CLOCK_MONOTONIC
94
95/*
96 * The various flags for setting POSIX.1b interval timers:
97 */
98#define TIMER_ABSTIME 0x01
99
100#endif /* _UAPI_LINUX_TIME_H */
101