projects/linux·blob v2.6.14 · refs

173 lines · 4.5 KiB

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