Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1#ifndef _LINUX_TIME_H
2#define _LINUX_TIME_H
3
4#include <linux/types.h>
5
6#ifdef __KERNEL__
7#include <linux/seqlock.h>
8#endif
9
10#ifndef _STRUCT_TIMESPEC
11#define _STRUCT_TIMESPEC
12struct timespec {
13 time_t tv_sec; /* seconds */
14 long tv_nsec; /* nanoseconds */
15};
16#endif /* _STRUCT_TIMESPEC */
17
18struct timeval {
19 time_t tv_sec; /* seconds */
20 suseconds_t tv_usec; /* microseconds */
21};
22
23struct timezone {
24 int tz_minuteswest; /* minutes west of Greenwich */
25 int tz_dsttime; /* type of dst correction */
26};
27
28#ifdef __KERNEL__
29
30/* Parameters used to convert the timespec values */
31#ifndef USEC_PER_SEC
32#define USEC_PER_SEC (1000000L)
33#endif
34
35#ifndef NSEC_PER_SEC
36#define NSEC_PER_SEC (1000000000L)
37#endif
38
39#ifndef NSEC_PER_USEC
40#define NSEC_PER_USEC (1000L)
41#endif
42
43static __inline__ int timespec_equal(struct timespec *a, struct timespec *b)
44{
45 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
46}
47
48/* Converts Gregorian date to seconds since 1970-01-01 00:00:00.
49 * Assumes input in normal date format, i.e. 1980-12-31 23:59:59
50 * => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
51 *
52 * [For the Julian calendar (which was used in Russia before 1917,
53 * Britain & colonies before 1752, anywhere else before 1582,
54 * and is still in use by some communities) leave out the
55 * -year/100+year/400 terms, and add 10.]
56 *
57 * This algorithm was first published by Gauss (I think).
58 *
59 * WARNING: this function will overflow on 2106-02-07 06:28:16 on
60 * machines were long is 32-bit! (However, as time_t is signed, we
61 * will already get problems at other places on 2038-01-19 03:14:08)
62 */
63static inline unsigned long
64mktime (unsigned int year, unsigned int mon,
65 unsigned int day, unsigned int hour,
66 unsigned int min, unsigned int sec)
67{
68 if (0 >= (int) (mon -= 2)) { /* 1..12 -> 11,12,1..10 */
69 mon += 12; /* Puts Feb last since it has leap day */
70 year -= 1;
71 }
72
73 return (((
74 (unsigned long) (year/4 - year/100 + year/400 + 367*mon/12 + day) +
75 year*365 - 719499
76 )*24 + hour /* now have hours */
77 )*60 + min /* now have minutes */
78 )*60 + sec; /* finally seconds */
79}
80
81extern struct timespec xtime;
82extern struct timespec wall_to_monotonic;
83extern seqlock_t xtime_lock;
84
85static inline unsigned long get_seconds(void)
86{
87 return xtime.tv_sec;
88}
89
90struct timespec current_kernel_time(void);
91
92#define CURRENT_TIME (current_kernel_time())
93#define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 })
94
95extern void do_gettimeofday(struct timeval *tv);
96extern int do_settimeofday(struct timespec *tv);
97extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
98extern void clock_was_set(void); // call when ever the clock is set
99extern int do_posix_clock_monotonic_gettime(struct timespec *tp);
100extern long do_nanosleep(struct timespec *t);
101extern long do_utimes(char __user * filename, struct timeval * times);
102struct itimerval;
103extern int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue);
104extern int do_getitimer(int which, struct itimerval *value);
105extern void getnstimeofday (struct timespec *tv);
106
107extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
108
109static inline void
110set_normalized_timespec (struct timespec *ts, time_t sec, long nsec)
111{
112 while (nsec > NSEC_PER_SEC) {
113 nsec -= NSEC_PER_SEC;
114 ++sec;
115 }
116 while (nsec < 0) {
117 nsec += NSEC_PER_SEC;
118 --sec;
119 }
120 ts->tv_sec = sec;
121 ts->tv_nsec = nsec;
122}
123
124#endif /* __KERNEL__ */
125
126#define NFDBITS __NFDBITS
127
128#define FD_SETSIZE __FD_SETSIZE
129#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
130#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
131#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
132#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
133
134/*
135 * Names of the interval timers, and structure
136 * defining a timer setting.
137 */
138#define ITIMER_REAL 0
139#define ITIMER_VIRTUAL 1
140#define ITIMER_PROF 2
141
142struct itimerspec {
143 struct timespec it_interval; /* timer period */
144 struct timespec it_value; /* timer expiration */
145};
146
147struct itimerval {
148 struct timeval it_interval; /* timer interval */
149 struct timeval it_value; /* current value */
150};
151
152
153/*
154 * The IDs of the various system clocks (for POSIX.1b interval timers).
155 */
156#define CLOCK_REALTIME 0
157#define CLOCK_MONOTONIC 1
158#define CLOCK_PROCESS_CPUTIME_ID 2
159#define CLOCK_THREAD_CPUTIME_ID 3
160#define CLOCK_REALTIME_HR 4
161#define CLOCK_MONOTONIC_HR 5
162
163/*
164 * The IDs of various hardware clocks
165 */
166
167
168#define CLOCK_SGI_CYCLE 10
169#define MAX_CLOCKS 16
170#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC | \
171 CLOCK_REALTIME_HR | CLOCK_MONOTONIC_HR)
172#define CLOCKS_MONO (CLOCK_MONOTONIC & CLOCK_MONOTONIC_HR)
173
174/*
175 * The various flags for setting POSIX.1b interval timers.
176 */
177
178#define TIMER_ABSTIME 0x01
179
180
181#endif