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 time_t tv_sec; /* seconds */
16 long tv_nsec; /* nanoseconds */
17};
18#endif
19
20struct timeval {
21 time_t tv_sec; /* seconds */
22 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
32/* Parameters used to convert the timespec values: */
33#define MSEC_PER_SEC 1000L
34#define USEC_PER_MSEC 1000L
35#define NSEC_PER_USEC 1000L
36#define NSEC_PER_MSEC 1000000L
37#define USEC_PER_SEC 1000000L
38#define NSEC_PER_SEC 1000000000L
39#define FSEC_PER_SEC 1000000000000000L
40
41static inline int timespec_equal(const struct timespec *a,
42 const struct timespec *b)
43{
44 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
45}
46
47/*
48 * lhs < rhs: return <0
49 * lhs == rhs: return 0
50 * lhs > rhs: return >0
51 */
52static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
53{
54 if (lhs->tv_sec < rhs->tv_sec)
55 return -1;
56 if (lhs->tv_sec > rhs->tv_sec)
57 return 1;
58 return lhs->tv_nsec - rhs->tv_nsec;
59}
60
61static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
62{
63 if (lhs->tv_sec < rhs->tv_sec)
64 return -1;
65 if (lhs->tv_sec > rhs->tv_sec)
66 return 1;
67 return lhs->tv_usec - rhs->tv_usec;
68}
69
70extern unsigned long mktime(const unsigned int year, const unsigned int mon,
71 const unsigned int day, const unsigned int hour,
72 const unsigned int min, const unsigned int sec);
73
74extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
75
76/*
77 * sub = lhs - rhs, in normalized form
78 */
79static inline struct timespec timespec_sub(struct timespec lhs,
80 struct timespec rhs)
81{
82 struct timespec ts_delta;
83 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
84 lhs.tv_nsec - rhs.tv_nsec);
85 return ts_delta;
86}
87
88/*
89 * Returns true if the timespec is norm, false if denorm:
90 */
91#define timespec_valid(ts) \
92 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
93
94extern struct timespec xtime;
95extern struct timespec wall_to_monotonic;
96extern seqlock_t xtime_lock;
97
98extern unsigned long read_persistent_clock(void);
99extern int update_persistent_clock(struct timespec now);
100extern int no_sync_cmos_clock __read_mostly;
101void timekeeping_init(void);
102
103unsigned long get_seconds(void);
104struct timespec current_kernel_time(void);
105
106#define CURRENT_TIME (current_kernel_time())
107#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
108
109extern void do_gettimeofday(struct timeval *tv);
110extern int do_settimeofday(struct timespec *tv);
111extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
112#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
113extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags);
114struct itimerval;
115extern int do_setitimer(int which, struct itimerval *value,
116 struct itimerval *ovalue);
117extern unsigned int alarm_setitimer(unsigned int seconds);
118extern int do_getitimer(int which, struct itimerval *value);
119extern void getnstimeofday(struct timespec *tv);
120extern void getboottime(struct timespec *ts);
121extern void monotonic_to_bootbased(struct timespec *ts);
122
123extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
124extern int timekeeping_valid_for_hres(void);
125extern void update_wall_time(void);
126extern void update_xtime_cache(u64 nsec);
127
128/**
129 * timespec_to_ns - Convert timespec to nanoseconds
130 * @ts: pointer to the timespec variable to be converted
131 *
132 * Returns the scalar nanosecond representation of the timespec
133 * parameter.
134 */
135static inline s64 timespec_to_ns(const struct timespec *ts)
136{
137 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
138}
139
140/**
141 * timeval_to_ns - Convert timeval to nanoseconds
142 * @ts: pointer to the timeval variable to be converted
143 *
144 * Returns the scalar nanosecond representation of the timeval
145 * parameter.
146 */
147static inline s64 timeval_to_ns(const struct timeval *tv)
148{
149 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
150 tv->tv_usec * NSEC_PER_USEC;
151}
152
153/**
154 * ns_to_timespec - Convert nanoseconds to timespec
155 * @nsec: the nanoseconds value to be converted
156 *
157 * Returns the timespec representation of the nsec parameter.
158 */
159extern struct timespec ns_to_timespec(const s64 nsec);
160
161/**
162 * ns_to_timeval - Convert nanoseconds to timeval
163 * @nsec: the nanoseconds value to be converted
164 *
165 * Returns the timeval representation of the nsec parameter.
166 */
167extern struct timeval ns_to_timeval(const s64 nsec);
168
169/**
170 * timespec_add_ns - Adds nanoseconds to a timespec
171 * @a: pointer to timespec to be incremented
172 * @ns: unsigned nanoseconds value to be added
173 *
174 * This must always be inlined because its used from the x86-64 vdso,
175 * which cannot call other kernel functions.
176 */
177static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
178{
179 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
180 a->tv_nsec = ns;
181}
182#endif /* __KERNEL__ */
183
184#define NFDBITS __NFDBITS
185
186#define FD_SETSIZE __FD_SETSIZE
187#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
188#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
189#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
190#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
191
192/*
193 * Names of the interval timers, and structure
194 * defining a timer setting:
195 */
196#define ITIMER_REAL 0
197#define ITIMER_VIRTUAL 1
198#define ITIMER_PROF 2
199
200struct itimerspec {
201 struct timespec it_interval; /* timer period */
202 struct timespec it_value; /* timer expiration */
203};
204
205struct itimerval {
206 struct timeval it_interval; /* timer interval */
207 struct timeval it_value; /* current value */
208};
209
210/*
211 * The IDs of the various system clocks (for POSIX.1b interval timers):
212 */
213#define CLOCK_REALTIME 0
214#define CLOCK_MONOTONIC 1
215#define CLOCK_PROCESS_CPUTIME_ID 2
216#define CLOCK_THREAD_CPUTIME_ID 3
217
218/*
219 * The IDs of various hardware clocks:
220 */
221#define CLOCK_SGI_CYCLE 10
222#define MAX_CLOCKS 16
223#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
224#define CLOCKS_MONO CLOCK_MONOTONIC
225
226/*
227 * The various flags for setting POSIX.1b interval timers:
228 */
229#define TIMER_ABSTIME 0x01
230
231#endif