1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _UAPI_LINUX_TIME_H
3 #define _UAPI_LINUX_TIME_H
5 #include <linux/types.h>
8 #ifndef _STRUCT_TIMESPEC
9 #define _STRUCT_TIMESPEC
11 __kernel_time_t tv_sec; /* seconds */
12 long tv_nsec; /* nanoseconds */
17 __kernel_time_t tv_sec; /* seconds */
18 __kernel_suseconds_t tv_usec; /* microseconds */
22 int tz_minuteswest; /* minutes west of Greenwich */
23 int tz_dsttime; /* type of dst correction */
28 * Names of the interval timers, and structure
29 * defining a timer setting:
32 #define ITIMER_VIRTUAL 1
36 struct timespec it_interval; /* timer period */
37 struct timespec it_value; /* timer expiration */
41 struct timeval it_interval; /* timer interval */
42 struct timeval it_value; /* current value */
45 #ifndef __kernel_timespec
46 struct __kernel_timespec {
47 __kernel_time64_t tv_sec; /* seconds */
48 long long tv_nsec; /* nanoseconds */
52 #ifndef __kernel_itimerspec
53 struct __kernel_itimerspec {
54 struct __kernel_timespec it_interval; /* timer period */
55 struct __kernel_timespec it_value; /* timer expiration */
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.
66 struct __kernel_old_timeval {
67 __kernel_long_t tv_sec;
68 __kernel_long_t tv_usec;
72 * The IDs of the various system clocks (for POSIX.1b interval timers):
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
85 * The driver implementing this got removed. The clock ID is kept as a
86 * place holder. Do not reuse!
88 #define CLOCK_SGI_CYCLE 10
92 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
93 #define CLOCKS_MONO CLOCK_MONOTONIC
96 * The various flags for setting POSIX.1b interval timers:
98 #define TIMER_ABSTIME 0x01
100 #endif /* _UAPI_LINUX_TIME_H */