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/cache.h>
8# include <linux/seqlock.h>
9# include <linux/math64.h>
10#endif
11
12#ifndef _STRUCT_TIMESPEC
13#define _STRUCT_TIMESPEC
14struct timespec {
15 __kernel_time_t tv_sec; /* seconds */
16 long tv_nsec; /* nanoseconds */
17};
18#endif
19
20struct timeval {
21 __kernel_time_t tv_sec; /* seconds */
22 __kernel_suseconds_t tv_usec; /* microseconds */
23};
24
25struct timezone {
26 int tz_minuteswest; /* minutes west of Greenwich */
27 int tz_dsttime; /* type of dst correction */
28};
29
30#ifdef __KERNEL__
31
32extern struct timezone sys_tz;
33
34/* Parameters used to convert the timespec values: */
35#define MSEC_PER_SEC 1000L
36#define USEC_PER_MSEC 1000L
37#define NSEC_PER_USEC 1000L
38#define NSEC_PER_MSEC 1000000L
39#define USEC_PER_SEC 1000000L
40#define NSEC_PER_SEC 1000000000L
41#define FSEC_PER_SEC 1000000000000000L
42
43#define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
44
45static inline int timespec_equal(const struct timespec *a,
46 const struct timespec *b)
47{
48 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
49}
50
51/*
52 * lhs < rhs: return <0
53 * lhs == rhs: return 0
54 * lhs > rhs: return >0
55 */
56static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
57{
58 if (lhs->tv_sec < rhs->tv_sec)
59 return -1;
60 if (lhs->tv_sec > rhs->tv_sec)
61 return 1;
62 return lhs->tv_nsec - rhs->tv_nsec;
63}
64
65static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
66{
67 if (lhs->tv_sec < rhs->tv_sec)
68 return -1;
69 if (lhs->tv_sec > rhs->tv_sec)
70 return 1;
71 return lhs->tv_usec - rhs->tv_usec;
72}
73
74extern unsigned long mktime(const unsigned int year, const unsigned int mon,
75 const unsigned int day, const unsigned int hour,
76 const unsigned int min, const unsigned int sec);
77
78extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
79extern struct timespec timespec_add_safe(const struct timespec lhs,
80 const struct timespec rhs);
81
82/*
83 * sub = lhs - rhs, in normalized form
84 */
85static inline struct timespec timespec_sub(struct timespec lhs,
86 struct timespec rhs)
87{
88 struct timespec ts_delta;
89 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
90 lhs.tv_nsec - rhs.tv_nsec);
91 return ts_delta;
92}
93
94/*
95 * Returns true if the timespec is norm, false if denorm:
96 */
97#define timespec_valid(ts) \
98 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
99
100extern struct timespec xtime;
101extern struct timespec wall_to_monotonic;
102extern seqlock_t xtime_lock;
103
104extern void read_persistent_clock(struct timespec *ts);
105extern void read_boot_clock(struct timespec *ts);
106extern int update_persistent_clock(struct timespec now);
107extern int no_sync_cmos_clock __read_mostly;
108void timekeeping_init(void);
109extern int timekeeping_suspended;
110
111unsigned long get_seconds(void);
112struct timespec current_kernel_time(void);
113struct timespec __current_kernel_time(void); /* does not hold xtime_lock */
114struct timespec get_monotonic_coarse(void);
115
116#define CURRENT_TIME (current_kernel_time())
117#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
118
119/* Some architectures do not supply their own clocksource.
120 * This is mainly the case in architectures that get their
121 * inter-tick times by reading the counter on their interval
122 * timer. Since these timers wrap every tick, they're not really
123 * useful as clocksources. Wrapping them to act like one is possible
124 * but not very efficient. So we provide a callout these arches
125 * can implement for use with the jiffies clocksource to provide
126 * finer then tick granular time.
127 */
128#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
129extern u32 arch_gettimeoffset(void);
130#else
131static inline u32 arch_gettimeoffset(void) { return 0; }
132#endif
133
134extern void do_gettimeofday(struct timeval *tv);
135extern int do_settimeofday(struct timespec *tv);
136extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
137#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
138extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags);
139struct itimerval;
140extern int do_setitimer(int which, struct itimerval *value,
141 struct itimerval *ovalue);
142extern unsigned int alarm_setitimer(unsigned int seconds);
143extern int do_getitimer(int which, struct itimerval *value);
144extern void getnstimeofday(struct timespec *tv);
145extern void getrawmonotonic(struct timespec *ts);
146extern void getboottime(struct timespec *ts);
147extern void monotonic_to_bootbased(struct timespec *ts);
148
149extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
150extern int timekeeping_valid_for_hres(void);
151extern u64 timekeeping_max_deferment(void);
152extern void update_wall_time(void);
153extern void update_xtime_cache(u64 nsec);
154extern void timekeeping_leap_insert(int leapsecond);
155
156struct tms;
157extern void do_sys_times(struct tms *);
158
159/*
160 * Similar to the struct tm in userspace <time.h>, but it needs to be here so
161 * that the kernel source is self contained.
162 */
163struct tm {
164 /*
165 * the number of seconds after the minute, normally in the range
166 * 0 to 59, but can be up to 60 to allow for leap seconds
167 */
168 int tm_sec;
169 /* the number of minutes after the hour, in the range 0 to 59*/
170 int tm_min;
171 /* the number of hours past midnight, in the range 0 to 23 */
172 int tm_hour;
173 /* the day of the month, in the range 1 to 31 */
174 int tm_mday;
175 /* the number of months since January, in the range 0 to 11 */
176 int tm_mon;
177 /* the number of years since 1900 */
178 long tm_year;
179 /* the number of days since Sunday, in the range 0 to 6 */
180 int tm_wday;
181 /* the number of days since January 1, in the range 0 to 365 */
182 int tm_yday;
183};
184
185void time_to_tm(time_t totalsecs, int offset, struct tm *result);
186
187/**
188 * timespec_to_ns - Convert timespec to nanoseconds
189 * @ts: pointer to the timespec variable to be converted
190 *
191 * Returns the scalar nanosecond representation of the timespec
192 * parameter.
193 */
194static inline s64 timespec_to_ns(const struct timespec *ts)
195{
196 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
197}
198
199/**
200 * timeval_to_ns - Convert timeval to nanoseconds
201 * @ts: pointer to the timeval variable to be converted
202 *
203 * Returns the scalar nanosecond representation of the timeval
204 * parameter.
205 */
206static inline s64 timeval_to_ns(const struct timeval *tv)
207{
208 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
209 tv->tv_usec * NSEC_PER_USEC;
210}
211
212/**
213 * ns_to_timespec - Convert nanoseconds to timespec
214 * @nsec: the nanoseconds value to be converted
215 *
216 * Returns the timespec representation of the nsec parameter.
217 */
218extern struct timespec ns_to_timespec(const s64 nsec);
219
220/**
221 * ns_to_timeval - Convert nanoseconds to timeval
222 * @nsec: the nanoseconds value to be converted
223 *
224 * Returns the timeval representation of the nsec parameter.
225 */
226extern struct timeval ns_to_timeval(const s64 nsec);
227
228/**
229 * timespec_add_ns - Adds nanoseconds to a timespec
230 * @a: pointer to timespec to be incremented
231 * @ns: unsigned nanoseconds value to be added
232 *
233 * This must always be inlined because its used from the x86-64 vdso,
234 * which cannot call other kernel functions.
235 */
236static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
237{
238 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
239 a->tv_nsec = ns;
240}
241#endif /* __KERNEL__ */
242
243#define NFDBITS __NFDBITS
244
245#define FD_SETSIZE __FD_SETSIZE
246#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
247#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
248#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
249#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
250
251/*
252 * Names of the interval timers, and structure
253 * defining a timer setting:
254 */
255#define ITIMER_REAL 0
256#define ITIMER_VIRTUAL 1
257#define ITIMER_PROF 2
258
259struct itimerspec {
260 struct timespec it_interval; /* timer period */
261 struct timespec it_value; /* timer expiration */
262};
263
264struct itimerval {
265 struct timeval it_interval; /* timer interval */
266 struct timeval it_value; /* current value */
267};
268
269/*
270 * The IDs of the various system clocks (for POSIX.1b interval timers):
271 */
272#define CLOCK_REALTIME 0
273#define CLOCK_MONOTONIC 1
274#define CLOCK_PROCESS_CPUTIME_ID 2
275#define CLOCK_THREAD_CPUTIME_ID 3
276#define CLOCK_MONOTONIC_RAW 4
277#define CLOCK_REALTIME_COARSE 5
278#define CLOCK_MONOTONIC_COARSE 6
279
280/*
281 * The IDs of various hardware clocks:
282 */
283#define CLOCK_SGI_CYCLE 10
284#define MAX_CLOCKS 16
285#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
286#define CLOCKS_MONO CLOCK_MONOTONIC
287
288/*
289 * The various flags for setting POSIX.1b interval timers:
290 */
291#define TIMER_ABSTIME 0x01
292
293#endif