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 1000000000000000LL
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);
79
80/*
81 * timespec_add_safe assumes both values are positive and checks
82 * for overflow. It will return TIME_T_MAX if the reutrn would be
83 * smaller then either of the arguments.
84 */
85extern struct timespec timespec_add_safe(const struct timespec lhs,
86 const struct timespec rhs);
87
88
89static inline struct timespec timespec_add(struct timespec lhs,
90 struct timespec rhs)
91{
92 struct timespec ts_delta;
93 set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec,
94 lhs.tv_nsec + rhs.tv_nsec);
95 return ts_delta;
96}
97
98/*
99 * sub = lhs - rhs, in normalized form
100 */
101static inline struct timespec timespec_sub(struct timespec lhs,
102 struct timespec rhs)
103{
104 struct timespec ts_delta;
105 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
106 lhs.tv_nsec - rhs.tv_nsec);
107 return ts_delta;
108}
109
110/*
111 * Returns true if the timespec is norm, false if denorm:
112 */
113#define timespec_valid(ts) \
114 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
115
116extern void read_persistent_clock(struct timespec *ts);
117extern void read_boot_clock(struct timespec *ts);
118extern int update_persistent_clock(struct timespec now);
119extern int no_sync_cmos_clock __read_mostly;
120void timekeeping_init(void);
121extern int timekeeping_suspended;
122
123unsigned long get_seconds(void);
124struct timespec current_kernel_time(void);
125struct timespec __current_kernel_time(void); /* does not take xtime_lock */
126struct timespec get_monotonic_coarse(void);
127void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
128 struct timespec *wtom, struct timespec *sleep);
129
130#define CURRENT_TIME (current_kernel_time())
131#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
132
133/* Some architectures do not supply their own clocksource.
134 * This is mainly the case in architectures that get their
135 * inter-tick times by reading the counter on their interval
136 * timer. Since these timers wrap every tick, they're not really
137 * useful as clocksources. Wrapping them to act like one is possible
138 * but not very efficient. So we provide a callout these arches
139 * can implement for use with the jiffies clocksource to provide
140 * finer then tick granular time.
141 */
142#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
143extern u32 arch_gettimeoffset(void);
144#else
145static inline u32 arch_gettimeoffset(void) { return 0; }
146#endif
147
148extern void do_gettimeofday(struct timeval *tv);
149extern int do_settimeofday(const struct timespec *tv);
150extern int do_sys_settimeofday(const struct timespec *tv,
151 const struct timezone *tz);
152#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
153extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
154struct itimerval;
155extern int do_setitimer(int which, struct itimerval *value,
156 struct itimerval *ovalue);
157extern unsigned int alarm_setitimer(unsigned int seconds);
158extern int do_getitimer(int which, struct itimerval *value);
159extern void getnstimeofday(struct timespec *tv);
160extern void getrawmonotonic(struct timespec *ts);
161extern void getnstime_raw_and_real(struct timespec *ts_raw,
162 struct timespec *ts_real);
163extern void getboottime(struct timespec *ts);
164extern void monotonic_to_bootbased(struct timespec *ts);
165extern void get_monotonic_boottime(struct timespec *ts);
166
167extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
168extern int timekeeping_valid_for_hres(void);
169extern u64 timekeeping_max_deferment(void);
170extern void timekeeping_leap_insert(int leapsecond);
171extern int timekeeping_inject_offset(struct timespec *ts);
172
173struct tms;
174extern void do_sys_times(struct tms *);
175
176/*
177 * Similar to the struct tm in userspace <time.h>, but it needs to be here so
178 * that the kernel source is self contained.
179 */
180struct tm {
181 /*
182 * the number of seconds after the minute, normally in the range
183 * 0 to 59, but can be up to 60 to allow for leap seconds
184 */
185 int tm_sec;
186 /* the number of minutes after the hour, in the range 0 to 59*/
187 int tm_min;
188 /* the number of hours past midnight, in the range 0 to 23 */
189 int tm_hour;
190 /* the day of the month, in the range 1 to 31 */
191 int tm_mday;
192 /* the number of months since January, in the range 0 to 11 */
193 int tm_mon;
194 /* the number of years since 1900 */
195 long tm_year;
196 /* the number of days since Sunday, in the range 0 to 6 */
197 int tm_wday;
198 /* the number of days since January 1, in the range 0 to 365 */
199 int tm_yday;
200};
201
202void time_to_tm(time_t totalsecs, int offset, struct tm *result);
203
204/**
205 * timespec_to_ns - Convert timespec to nanoseconds
206 * @ts: pointer to the timespec variable to be converted
207 *
208 * Returns the scalar nanosecond representation of the timespec
209 * parameter.
210 */
211static inline s64 timespec_to_ns(const struct timespec *ts)
212{
213 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
214}
215
216/**
217 * timeval_to_ns - Convert timeval to nanoseconds
218 * @ts: pointer to the timeval variable to be converted
219 *
220 * Returns the scalar nanosecond representation of the timeval
221 * parameter.
222 */
223static inline s64 timeval_to_ns(const struct timeval *tv)
224{
225 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
226 tv->tv_usec * NSEC_PER_USEC;
227}
228
229/**
230 * ns_to_timespec - Convert nanoseconds to timespec
231 * @nsec: the nanoseconds value to be converted
232 *
233 * Returns the timespec representation of the nsec parameter.
234 */
235extern struct timespec ns_to_timespec(const s64 nsec);
236
237/**
238 * ns_to_timeval - Convert nanoseconds to timeval
239 * @nsec: the nanoseconds value to be converted
240 *
241 * Returns the timeval representation of the nsec parameter.
242 */
243extern struct timeval ns_to_timeval(const s64 nsec);
244
245/**
246 * timespec_add_ns - Adds nanoseconds to a timespec
247 * @a: pointer to timespec to be incremented
248 * @ns: unsigned nanoseconds value to be added
249 *
250 * This must always be inlined because its used from the x86-64 vdso,
251 * which cannot call other kernel functions.
252 */
253static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
254{
255 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
256 a->tv_nsec = ns;
257}
258#endif /* __KERNEL__ */
259
260#define NFDBITS __NFDBITS
261
262#define FD_SETSIZE __FD_SETSIZE
263#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
264#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
265#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
266#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
267
268/*
269 * Names of the interval timers, and structure
270 * defining a timer setting:
271 */
272#define ITIMER_REAL 0
273#define ITIMER_VIRTUAL 1
274#define ITIMER_PROF 2
275
276struct itimerspec {
277 struct timespec it_interval; /* timer period */
278 struct timespec it_value; /* timer expiration */
279};
280
281struct itimerval {
282 struct timeval it_interval; /* timer interval */
283 struct timeval it_value; /* current value */
284};
285
286/*
287 * The IDs of the various system clocks (for POSIX.1b interval timers):
288 */
289#define CLOCK_REALTIME 0
290#define CLOCK_MONOTONIC 1
291#define CLOCK_PROCESS_CPUTIME_ID 2
292#define CLOCK_THREAD_CPUTIME_ID 3
293#define CLOCK_MONOTONIC_RAW 4
294#define CLOCK_REALTIME_COARSE 5
295#define CLOCK_MONOTONIC_COARSE 6
296#define CLOCK_BOOTTIME 7
297
298/*
299 * The IDs of various hardware clocks:
300 */
301#define CLOCK_SGI_CYCLE 10
302#define MAX_CLOCKS 16
303#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
304#define CLOCKS_MONO CLOCK_MONOTONIC
305
306/*
307 * The various flags for setting POSIX.1b interval timers:
308 */
309#define TIMER_ABSTIME 0x01
310
311#endif