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
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 */