Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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/*
46 * legacy timeval structure, only embedded in structures that
47 * traditionally used 'timeval' to pass time intervals (not absolute
48 * times). Do not add new users. If user space fails to compile
49 * here, this is probably because it is not y2038 safe and needs to
50 * be changed to use another interface.
51 */
52struct __kernel_old_timeval {
53 __kernel_long_t tv_sec;
54 __kernel_long_t tv_usec;
55};
56
57/*
58 * The IDs of the various system clocks (for POSIX.1b interval timers):
59 */
60#define CLOCK_REALTIME 0
61#define CLOCK_MONOTONIC 1
62#define CLOCK_PROCESS_CPUTIME_ID 2
63#define CLOCK_THREAD_CPUTIME_ID 3
64#define CLOCK_MONOTONIC_RAW 4
65#define CLOCK_REALTIME_COARSE 5
66#define CLOCK_MONOTONIC_COARSE 6
67#define CLOCK_BOOTTIME 7
68#define CLOCK_REALTIME_ALARM 8
69#define CLOCK_BOOTTIME_ALARM 9
70/*
71 * The driver implementing this got removed. The clock ID is kept as a
72 * place holder. Do not reuse!
73 */
74#define CLOCK_SGI_CYCLE 10
75#define CLOCK_TAI 11
76
77#define MAX_CLOCKS 16
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 */