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#endif
10
11#ifndef _STRUCT_TIMESPEC
12#define _STRUCT_TIMESPEC
13struct timespec {
14 time_t tv_sec; /* seconds */
15 long tv_nsec; /* nanoseconds */
16};
17#endif
18
19struct timeval {
20 time_t tv_sec; /* seconds */
21 suseconds_t tv_usec; /* microseconds */
22};
23
24struct timezone {
25 int tz_minuteswest; /* minutes west of Greenwich */
26 int tz_dsttime; /* type of dst correction */
27};
28
29#ifdef __KERNEL__
30
31/* Parameters used to convert the timespec values: */
32#define MSEC_PER_SEC 1000L
33#define USEC_PER_MSEC 1000L
34#define NSEC_PER_USEC 1000L
35#define NSEC_PER_MSEC 1000000L
36#define USEC_PER_SEC 1000000L
37#define NSEC_PER_SEC 1000000000L
38#define FSEC_PER_SEC 1000000000000000L
39
40static inline int timespec_equal(const struct timespec *a,
41 const struct timespec *b)
42{
43 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
44}
45
46/*
47 * lhs < rhs: return <0
48 * lhs == rhs: return 0
49 * lhs > rhs: return >0
50 */
51static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
52{
53 if (lhs->tv_sec < rhs->tv_sec)
54 return -1;
55 if (lhs->tv_sec > rhs->tv_sec)
56 return 1;
57 return lhs->tv_nsec - rhs->tv_nsec;
58}
59
60static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
61{
62 if (lhs->tv_sec < rhs->tv_sec)
63 return -1;
64 if (lhs->tv_sec > rhs->tv_sec)
65 return 1;
66 return lhs->tv_usec - rhs->tv_usec;
67}
68
69extern unsigned long mktime(const unsigned int year, const unsigned int mon,
70 const unsigned int day, const unsigned int hour,
71 const unsigned int min, const unsigned int sec);
72
73extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
74
75/*
76 * sub = lhs - rhs, in normalized form
77 */
78static inline struct timespec timespec_sub(struct timespec lhs,
79 struct timespec rhs)
80{
81 struct timespec ts_delta;
82 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
83 lhs.tv_nsec - rhs.tv_nsec);
84 return ts_delta;
85}
86
87/*
88 * Returns true if the timespec is norm, false if denorm:
89 */
90#define timespec_valid(ts) \
91 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
92
93extern struct timespec xtime;
94extern struct timespec wall_to_monotonic;
95extern seqlock_t xtime_lock;
96
97extern unsigned long read_persistent_clock(void);
98extern int update_persistent_clock(struct timespec now);
99extern int no_sync_cmos_clock __read_mostly;
100void timekeeping_init(void);
101
102unsigned long get_seconds(void);
103struct timespec current_kernel_time(void);
104
105#define CURRENT_TIME (current_kernel_time())
106#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 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);
119extern void getboottime(struct timespec *ts);
120extern void monotonic_to_bootbased(struct timespec *ts);
121
122extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
123extern int timekeeping_valid_for_hres(void);
124extern void update_wall_time(void);
125extern void update_xtime_cache(u64 nsec);
126
127/**
128 * timespec_to_ns - Convert timespec to nanoseconds
129 * @ts: pointer to the timespec variable to be converted
130 *
131 * Returns the scalar nanosecond representation of the timespec
132 * parameter.
133 */
134static inline s64 timespec_to_ns(const struct timespec *ts)
135{
136 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
137}
138
139/**
140 * timeval_to_ns - Convert timeval to nanoseconds
141 * @ts: pointer to the timeval variable to be converted
142 *
143 * Returns the scalar nanosecond representation of the timeval
144 * parameter.
145 */
146static inline s64 timeval_to_ns(const struct timeval *tv)
147{
148 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
149 tv->tv_usec * NSEC_PER_USEC;
150}
151
152/**
153 * ns_to_timespec - Convert nanoseconds to timespec
154 * @nsec: the nanoseconds value to be converted
155 *
156 * Returns the timespec representation of the nsec parameter.
157 */
158extern struct timespec ns_to_timespec(const s64 nsec);
159
160/**
161 * ns_to_timeval - Convert nanoseconds to timeval
162 * @nsec: the nanoseconds value to be converted
163 *
164 * Returns the timeval representation of the nsec parameter.
165 */
166extern struct timeval ns_to_timeval(const s64 nsec);
167
168/**
169 * timespec_add_ns - Adds nanoseconds to a timespec
170 * @a: pointer to timespec to be incremented
171 * @ns: unsigned nanoseconds value to be added
172 */
173static inline void timespec_add_ns(struct timespec *a, u64 ns)
174{
175 ns += a->tv_nsec;
176 while(unlikely(ns >= NSEC_PER_SEC)) {
177 /* The following asm() prevents the compiler from
178 * optimising this loop into a modulo operation. */
179 asm("" : "+r"(ns));
180
181 ns -= NSEC_PER_SEC;
182 a->tv_sec++;
183 }
184 a->tv_nsec = ns;
185}
186#endif /* __KERNEL__ */
187
188#define NFDBITS __NFDBITS
189
190#define FD_SETSIZE __FD_SETSIZE
191#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
192#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
193#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
194#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
195
196/*
197 * Names of the interval timers, and structure
198 * defining a timer setting:
199 */
200#define ITIMER_REAL 0
201#define ITIMER_VIRTUAL 1
202#define ITIMER_PROF 2
203
204struct itimerspec {
205 struct timespec it_interval; /* timer period */
206 struct timespec it_value; /* timer expiration */
207};
208
209struct itimerval {
210 struct timeval it_interval; /* timer interval */
211 struct timeval it_value; /* current value */
212};
213
214/*
215 * The IDs of the various system clocks (for POSIX.1b interval timers):
216 */
217#define CLOCK_REALTIME 0
218#define CLOCK_MONOTONIC 1
219#define CLOCK_PROCESS_CPUTIME_ID 2
220#define CLOCK_THREAD_CPUTIME_ID 3
221
222/*
223 * The IDs of various hardware clocks:
224 */
225#define CLOCK_SGI_CYCLE 10
226#define MAX_CLOCKS 16
227#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
228#define CLOCKS_MONO CLOCK_MONOTONIC
229
230/*
231 * The various flags for setting POSIX.1b interval timers:
232 */
233#define TIMER_ABSTIME 0x01
234
235#endif