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_MSEC 1000L
33#define NSEC_PER_USEC 1000L
34#define NSEC_PER_MSEC 1000000L
35#define USEC_PER_SEC 1000000L
36#define NSEC_PER_SEC 1000000000L
37#define FSEC_PER_SEC 1000000000000000L
38
39static inline int timespec_equal(struct timespec *a, struct timespec *b)
40{
41 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
42}
43
44/*
45 * lhs < rhs: return <0
46 * lhs == rhs: return 0
47 * lhs > rhs: return >0
48 */
49static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
50{
51 if (lhs->tv_sec < rhs->tv_sec)
52 return -1;
53 if (lhs->tv_sec > rhs->tv_sec)
54 return 1;
55 return lhs->tv_nsec - rhs->tv_nsec;
56}
57
58static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
59{
60 if (lhs->tv_sec < rhs->tv_sec)
61 return -1;
62 if (lhs->tv_sec > rhs->tv_sec)
63 return 1;
64 return lhs->tv_usec - rhs->tv_usec;
65}
66
67extern unsigned long mktime(const unsigned int year, const unsigned int mon,
68 const unsigned int day, const unsigned int hour,
69 const unsigned int min, const unsigned int sec);
70
71extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
72
73/*
74 * sub = lhs - rhs, in normalized form
75 */
76static inline struct timespec timespec_sub(struct timespec lhs,
77 struct timespec rhs)
78{
79 struct timespec ts_delta;
80 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
81 lhs.tv_nsec - rhs.tv_nsec);
82 return ts_delta;
83}
84
85/*
86 * Returns true if the timespec is norm, false if denorm:
87 */
88#define timespec_valid(ts) \
89 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
90
91extern struct timespec xtime;
92extern struct timespec wall_to_monotonic;
93extern seqlock_t xtime_lock __attribute__((weak));
94
95extern unsigned long read_persistent_clock(void);
96void timekeeping_init(void);
97
98static inline unsigned long get_seconds(void)
99{
100 return xtime.tv_sec;
101}
102
103struct timespec current_kernel_time(void);
104
105#define CURRENT_TIME (current_kernel_time())
106#define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 })
107
108extern void do_gettimeofday(struct timeval *tv);
109extern int do_settimeofday(struct timespec *tv);
110extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
111#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
112extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags);
113struct itimerval;
114extern int do_setitimer(int which, struct itimerval *value,
115 struct itimerval *ovalue);
116extern unsigned int alarm_setitimer(unsigned int seconds);
117extern int do_getitimer(int which, struct itimerval *value);
118extern void getnstimeofday(struct timespec *tv);
119
120extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
121extern int timekeeping_is_continuous(void);
122extern void update_wall_time(void);
123
124/**
125 * timespec_to_ns - Convert timespec to nanoseconds
126 * @ts: pointer to the timespec variable to be converted
127 *
128 * Returns the scalar nanosecond representation of the timespec
129 * parameter.
130 */
131static inline s64 timespec_to_ns(const struct timespec *ts)
132{
133 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
134}
135
136/**
137 * timeval_to_ns - Convert timeval to nanoseconds
138 * @ts: pointer to the timeval variable to be converted
139 *
140 * Returns the scalar nanosecond representation of the timeval
141 * parameter.
142 */
143static inline s64 timeval_to_ns(const struct timeval *tv)
144{
145 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
146 tv->tv_usec * NSEC_PER_USEC;
147}
148
149/**
150 * ns_to_timespec - Convert nanoseconds to timespec
151 * @nsec: the nanoseconds value to be converted
152 *
153 * Returns the timespec representation of the nsec parameter.
154 */
155extern struct timespec ns_to_timespec(const s64 nsec);
156
157/**
158 * ns_to_timeval - Convert nanoseconds to timeval
159 * @nsec: the nanoseconds value to be converted
160 *
161 * Returns the timeval representation of the nsec parameter.
162 */
163extern struct timeval ns_to_timeval(const s64 nsec);
164
165/**
166 * timespec_add_ns - Adds nanoseconds to a timespec
167 * @a: pointer to timespec to be incremented
168 * @ns: unsigned nanoseconds value to be added
169 */
170static inline void timespec_add_ns(struct timespec *a, u64 ns)
171{
172 ns += a->tv_nsec;
173 while(unlikely(ns >= NSEC_PER_SEC)) {
174 ns -= NSEC_PER_SEC;
175 a->tv_sec++;
176 }
177 a->tv_nsec = ns;
178}
179#endif /* __KERNEL__ */
180
181#define NFDBITS __NFDBITS
182
183#define FD_SETSIZE __FD_SETSIZE
184#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
185#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
186#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
187#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
188
189/*
190 * Names of the interval timers, and structure
191 * defining a timer setting:
192 */
193#define ITIMER_REAL 0
194#define ITIMER_VIRTUAL 1
195#define ITIMER_PROF 2
196
197struct itimerspec {
198 struct timespec it_interval; /* timer period */
199 struct timespec it_value; /* timer expiration */
200};
201
202struct itimerval {
203 struct timeval it_interval; /* timer interval */
204 struct timeval it_value; /* current value */
205};
206
207/*
208 * The IDs of the various system clocks (for POSIX.1b interval timers):
209 */
210#define CLOCK_REALTIME 0
211#define CLOCK_MONOTONIC 1
212#define CLOCK_PROCESS_CPUTIME_ID 2
213#define CLOCK_THREAD_CPUTIME_ID 3
214
215/*
216 * The IDs of various hardware clocks:
217 */
218#define CLOCK_SGI_CYCLE 10
219#define MAX_CLOCKS 16
220#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
221#define CLOCKS_MONO CLOCK_MONOTONIC
222
223/*
224 * The various flags for setting POSIX.1b interval timers:
225 */
226#define TIMER_ABSTIME 0x01
227
228#endif