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, long 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 unsigned long read_persistent_clock(void);
105extern int update_persistent_clock(struct timespec now);
106extern int no_sync_cmos_clock __read_mostly;
107void timekeeping_init(void);
108extern int timekeeping_suspended;
109
110unsigned long get_seconds(void);
111struct timespec current_kernel_time(void);
112
113#define CURRENT_TIME (current_kernel_time())
114#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
115
116/* Some architectures do not supply their own clocksource.
117 * This is mainly the case in architectures that get their
118 * inter-tick times by reading the counter on their interval
119 * timer. Since these timers wrap every tick, they're not really
120 * useful as clocksources. Wrapping them to act like one is possible
121 * but not very efficient. So we provide a callout these arches
122 * can implement for use with the jiffies clocksource to provide
123 * finer then tick granular time.
124 */
125#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
126extern u32 arch_gettimeoffset(void);
127#else
128static inline u32 arch_gettimeoffset(void) { return 0; }
129#endif
130
131extern void do_gettimeofday(struct timeval *tv);
132extern int do_settimeofday(struct timespec *tv);
133extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
134#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
135extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags);
136struct itimerval;
137extern int do_setitimer(int which, struct itimerval *value,
138 struct itimerval *ovalue);
139extern unsigned int alarm_setitimer(unsigned int seconds);
140extern int do_getitimer(int which, struct itimerval *value);
141extern void getnstimeofday(struct timespec *tv);
142extern void getrawmonotonic(struct timespec *ts);
143extern void getboottime(struct timespec *ts);
144extern void monotonic_to_bootbased(struct timespec *ts);
145
146extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
147extern int timekeeping_valid_for_hres(void);
148extern void update_wall_time(void);
149extern void update_xtime_cache(u64 nsec);
150
151struct tms;
152extern void do_sys_times(struct tms *);
153
154/**
155 * timespec_to_ns - Convert timespec to nanoseconds
156 * @ts: pointer to the timespec variable to be converted
157 *
158 * Returns the scalar nanosecond representation of the timespec
159 * parameter.
160 */
161static inline s64 timespec_to_ns(const struct timespec *ts)
162{
163 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
164}
165
166/**
167 * timeval_to_ns - Convert timeval to nanoseconds
168 * @ts: pointer to the timeval variable to be converted
169 *
170 * Returns the scalar nanosecond representation of the timeval
171 * parameter.
172 */
173static inline s64 timeval_to_ns(const struct timeval *tv)
174{
175 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
176 tv->tv_usec * NSEC_PER_USEC;
177}
178
179/**
180 * ns_to_timespec - Convert nanoseconds to timespec
181 * @nsec: the nanoseconds value to be converted
182 *
183 * Returns the timespec representation of the nsec parameter.
184 */
185extern struct timespec ns_to_timespec(const s64 nsec);
186
187/**
188 * ns_to_timeval - Convert nanoseconds to timeval
189 * @nsec: the nanoseconds value to be converted
190 *
191 * Returns the timeval representation of the nsec parameter.
192 */
193extern struct timeval ns_to_timeval(const s64 nsec);
194
195/**
196 * timespec_add_ns - Adds nanoseconds to a timespec
197 * @a: pointer to timespec to be incremented
198 * @ns: unsigned nanoseconds value to be added
199 *
200 * This must always be inlined because its used from the x86-64 vdso,
201 * which cannot call other kernel functions.
202 */
203static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
204{
205 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
206 a->tv_nsec = ns;
207}
208#endif /* __KERNEL__ */
209
210#define NFDBITS __NFDBITS
211
212#define FD_SETSIZE __FD_SETSIZE
213#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
214#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
215#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
216#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
217
218/*
219 * Names of the interval timers, and structure
220 * defining a timer setting:
221 */
222#define ITIMER_REAL 0
223#define ITIMER_VIRTUAL 1
224#define ITIMER_PROF 2
225
226struct itimerspec {
227 struct timespec it_interval; /* timer period */
228 struct timespec it_value; /* timer expiration */
229};
230
231struct itimerval {
232 struct timeval it_interval; /* timer interval */
233 struct timeval it_value; /* current value */
234};
235
236/*
237 * The IDs of the various system clocks (for POSIX.1b interval timers):
238 */
239#define CLOCK_REALTIME 0
240#define CLOCK_MONOTONIC 1
241#define CLOCK_PROCESS_CPUTIME_ID 2
242#define CLOCK_THREAD_CPUTIME_ID 3
243#define CLOCK_MONOTONIC_RAW 4
244
245/*
246 * The IDs of various hardware clocks:
247 */
248#define CLOCK_SGI_CYCLE 10
249#define MAX_CLOCKS 16
250#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
251#define CLOCKS_MONO CLOCK_MONOTONIC
252
253/*
254 * The various flags for setting POSIX.1b interval timers:
255 */
256#define TIMER_ABSTIME 0x01
257
258#endif