Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _LINUX_TIME_H
2#define _LINUX_TIME_H
3
4#include <linux/types.h>
5
6#ifdef __KERNEL__
7# include <linux/seqlock.h>
8#endif
9
10#ifndef _STRUCT_TIMESPEC
11#define _STRUCT_TIMESPEC
12struct timespec {
13 time_t tv_sec; /* seconds */
14 long tv_nsec; /* nanoseconds */
15};
16#endif
17
18struct timeval {
19 time_t tv_sec; /* seconds */
20 suseconds_t tv_usec; /* microseconds */
21};
22
23struct timezone {
24 int tz_minuteswest; /* minutes west of Greenwich */
25 int tz_dsttime; /* type of dst correction */
26};
27
28#ifdef __KERNEL__
29
30/* Parameters used to convert the timespec values: */
31#define MSEC_PER_SEC 1000L
32#define USEC_PER_SEC 1000000L
33#define NSEC_PER_SEC 1000000000L
34#define NSEC_PER_USEC 1000L
35
36static __inline__ int timespec_equal(struct timespec *a, struct timespec *b)
37{
38 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
39}
40
41extern unsigned long mktime(const unsigned int year, const unsigned int mon,
42 const unsigned int day, const unsigned int hour,
43 const unsigned int min, const unsigned int sec);
44
45extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
46
47/*
48 * Returns true if the timespec is norm, false if denorm:
49 */
50#define timespec_valid(ts) \
51 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
52
53/*
54 * 64-bit nanosec type. Large enough to span 292+ years in nanosecond
55 * resolution. Ought to be enough for a while.
56 */
57typedef s64 nsec_t;
58
59extern struct timespec xtime;
60extern struct timespec wall_to_monotonic;
61extern seqlock_t xtime_lock;
62
63static inline unsigned long get_seconds(void)
64{
65 return xtime.tv_sec;
66}
67
68struct timespec current_kernel_time(void);
69
70#define CURRENT_TIME (current_kernel_time())
71#define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 })
72
73extern void do_gettimeofday(struct timeval *tv);
74extern int do_settimeofday(struct timespec *tv);
75extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
76#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
77extern long do_utimes(int dfd, char __user *filename, struct timeval *times);
78struct itimerval;
79extern int do_setitimer(int which, struct itimerval *value,
80 struct itimerval *ovalue);
81extern int do_getitimer(int which, struct itimerval *value);
82extern void getnstimeofday(struct timespec *tv);
83
84extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
85
86/**
87 * timespec_to_ns - Convert timespec to nanoseconds
88 * @ts: pointer to the timespec variable to be converted
89 *
90 * Returns the scalar nanosecond representation of the timespec
91 * parameter.
92 */
93static inline nsec_t timespec_to_ns(const struct timespec *ts)
94{
95 return ((nsec_t) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
96}
97
98/**
99 * timeval_to_ns - Convert timeval to nanoseconds
100 * @ts: pointer to the timeval variable to be converted
101 *
102 * Returns the scalar nanosecond representation of the timeval
103 * parameter.
104 */
105static inline nsec_t timeval_to_ns(const struct timeval *tv)
106{
107 return ((nsec_t) tv->tv_sec * NSEC_PER_SEC) +
108 tv->tv_usec * NSEC_PER_USEC;
109}
110
111/**
112 * ns_to_timespec - Convert nanoseconds to timespec
113 * @nsec: the nanoseconds value to be converted
114 *
115 * Returns the timespec representation of the nsec parameter.
116 */
117extern struct timespec ns_to_timespec(const nsec_t nsec);
118
119/**
120 * ns_to_timeval - Convert nanoseconds to timeval
121 * @nsec: the nanoseconds value to be converted
122 *
123 * Returns the timeval representation of the nsec parameter.
124 */
125extern struct timeval ns_to_timeval(const nsec_t nsec);
126
127#endif /* __KERNEL__ */
128
129#define NFDBITS __NFDBITS
130
131#define FD_SETSIZE __FD_SETSIZE
132#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
133#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
134#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
135#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
136
137/*
138 * Names of the interval timers, and structure
139 * defining a timer setting:
140 */
141#define ITIMER_REAL 0
142#define ITIMER_VIRTUAL 1
143#define ITIMER_PROF 2
144
145struct itimerspec {
146 struct timespec it_interval; /* timer period */
147 struct timespec it_value; /* timer expiration */
148};
149
150struct itimerval {
151 struct timeval it_interval; /* timer interval */
152 struct timeval it_value; /* current value */
153};
154
155/*
156 * The IDs of the various system clocks (for POSIX.1b interval timers):
157 */
158#define CLOCK_REALTIME 0
159#define CLOCK_MONOTONIC 1
160#define CLOCK_PROCESS_CPUTIME_ID 2
161#define CLOCK_THREAD_CPUTIME_ID 3
162
163/*
164 * The IDs of various hardware clocks:
165 */
166#define CLOCK_SGI_CYCLE 10
167#define MAX_CLOCKS 16
168#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
169#define CLOCKS_MONO CLOCK_MONOTONIC
170
171/*
172 * The various flags for setting POSIX.1b interval timers:
173 */
174#define TIMER_ABSTIME 0x01
175
176#endif