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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_TIME_H
2#define _LINUX_TIME_H
3
4#include <linux/types.h>
5
6#ifdef __KERNEL__
Thomas Gleixner82644452007-07-21 04:37:37 -07007# include <linux/cache.h>
Ingo Molnar57a55872006-01-09 20:52:26 -08008# include <linux/seqlock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#endif
10
11#ifndef _STRUCT_TIMESPEC
12#define _STRUCT_TIMESPEC
13struct timespec {
14 time_t tv_sec; /* seconds */
15 long tv_nsec; /* nanoseconds */
16};
Ingo Molnar57a55872006-01-09 20:52:26 -080017#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
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
Ingo Molnar57a55872006-01-09 20:52:26 -080031/* Parameters used to convert the timespec values: */
Vojtech Pavlik05ebb762006-06-26 13:58:20 +020032#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Jan Engelhardt5b78cc92007-07-17 04:03:53 -070040static inline int timespec_equal(const struct timespec *a,
41 const struct timespec *b)
Ingo Molnar57a55872006-01-09 20:52:26 -080042{
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
Ingo Molnar57a55872006-01-09 20:52:26 -080044}
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Andrew Morton643a6542006-02-11 17:55:52 -080046/*
47 * lhs < rhs: return <0
48 * lhs == rhs: return 0
49 * lhs > rhs: return >0
50 */
Rolf Eike Beer77adbfb2007-02-10 01:45:49 -080051static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
Andrew Morton643a6542006-02-11 17:55:52 -080052{
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
Rolf Eike Beer77adbfb2007-02-10 01:45:49 -080060static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
Andrew Morton643a6542006-02-11 17:55:52 -080061{
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
Ingo Molnarf4818902006-01-09 20:52:23 -080069extern 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Thomas Gleixner5f82b2b2006-01-09 20:52:29 -080075/*
Shailabh Nagarca74e922006-07-14 00:24:36 -070076 * 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/*
Thomas Gleixner5f82b2b2006-01-09 20:52:29 -080088 * Returns true if the timespec is norm, false if denorm:
89 */
90#define timespec_valid(ts) \
Chris Wrightbd3f8f22006-01-31 19:10:23 -080091 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
Thomas Gleixner5f82b2b2006-01-09 20:52:29 -080092
Linus Torvalds1da177e2005-04-16 15:20:36 -070093extern struct timespec xtime;
94extern struct timespec wall_to_monotonic;
Adrian Bunkba2a6312007-10-16 23:27:16 -070095extern seqlock_t xtime_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
John Stultz411187f2007-02-16 01:27:30 -080097extern unsigned long read_persistent_clock(void);
Thomas Gleixner82644452007-07-21 04:37:37 -070098extern int update_persistent_clock(struct timespec now);
99extern int no_sync_cmos_clock __read_mostly;
john stultzad596172006-06-26 00:25:06 -0700100void timekeeping_init(void);
101
john stultz17c38b72007-07-24 18:38:34 -0700102unsigned long get_seconds(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103struct timespec current_kernel_time(void);
104
Ingo Molnar57a55872006-01-09 20:52:26 -0800105#define CURRENT_TIME (current_kernel_time())
john stultz2c6b47d2007-07-24 17:47:43 -0700106#define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
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);
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800111#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
Ulrich Drepper1c710c82007-05-08 00:33:25 -0700112extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113struct itimerval;
Ingo Molnar57a55872006-01-09 20:52:26 -0800114extern int do_setitimer(int which, struct itimerval *value,
115 struct itimerval *ovalue);
Thomas Gleixnerc08b8a42006-03-25 03:06:33 -0800116extern unsigned int alarm_setitimer(unsigned int seconds);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117extern int do_getitimer(int which, struct itimerval *value);
Ingo Molnar57a55872006-01-09 20:52:26 -0800118extern void getnstimeofday(struct timespec *tv);
Tomas Janousek7c3f1a52007-07-15 23:39:41 -0700119extern void getboottime(struct timespec *ts);
120extern void monotonic_to_bootbased(struct timespec *ts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
122extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
john stultzcf3c7692006-06-26 00:25:08 -0700123extern int timekeeping_is_continuous(void);
john stultz85240702007-05-08 00:27:59 -0700124extern void update_wall_time(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800126/**
127 * timespec_to_ns - Convert timespec to nanoseconds
128 * @ts: pointer to the timespec variable to be converted
129 *
130 * Returns the scalar nanosecond representation of the timespec
131 * parameter.
132 */
Roman Zippeldf869b62006-03-26 01:38:11 -0800133static inline s64 timespec_to_ns(const struct timespec *ts)
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800134{
Roman Zippeldf869b62006-03-26 01:38:11 -0800135 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800136}
137
138/**
139 * timeval_to_ns - Convert timeval to nanoseconds
140 * @ts: pointer to the timeval variable to be converted
141 *
142 * Returns the scalar nanosecond representation of the timeval
143 * parameter.
144 */
Roman Zippeldf869b62006-03-26 01:38:11 -0800145static inline s64 timeval_to_ns(const struct timeval *tv)
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800146{
Roman Zippeldf869b62006-03-26 01:38:11 -0800147 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800148 tv->tv_usec * NSEC_PER_USEC;
149}
150
151/**
152 * ns_to_timespec - Convert nanoseconds to timespec
153 * @nsec: the nanoseconds value to be converted
154 *
155 * Returns the timespec representation of the nsec parameter.
156 */
Roman Zippeldf869b62006-03-26 01:38:11 -0800157extern struct timespec ns_to_timespec(const s64 nsec);
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800158
159/**
160 * ns_to_timeval - Convert nanoseconds to timeval
161 * @nsec: the nanoseconds value to be converted
162 *
163 * Returns the timeval representation of the nsec parameter.
164 */
Roman Zippeldf869b62006-03-26 01:38:11 -0800165extern struct timeval ns_to_timeval(const s64 nsec);
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800166
john stultzcf3c7692006-06-26 00:25:08 -0700167/**
168 * timespec_add_ns - Adds nanoseconds to a timespec
169 * @a: pointer to timespec to be incremented
170 * @ns: unsigned nanoseconds value to be added
171 */
172static inline void timespec_add_ns(struct timespec *a, u64 ns)
173{
174 ns += a->tv_nsec;
175 while(unlikely(ns >= NSEC_PER_SEC)) {
176 ns -= NSEC_PER_SEC;
177 a->tv_sec++;
178 }
179 a->tv_nsec = ns;
180}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181#endif /* __KERNEL__ */
182
183#define NFDBITS __NFDBITS
184
185#define FD_SETSIZE __FD_SETSIZE
186#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
187#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
188#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
189#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
190
191/*
192 * Names of the interval timers, and structure
Ingo Molnar57a55872006-01-09 20:52:26 -0800193 * defining a timer setting:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 */
Ingo Molnar57a55872006-01-09 20:52:26 -0800195#define ITIMER_REAL 0
196#define ITIMER_VIRTUAL 1
197#define ITIMER_PROF 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Ingo Molnar57a55872006-01-09 20:52:26 -0800199struct itimerspec {
200 struct timespec it_interval; /* timer period */
201 struct timespec it_value; /* timer expiration */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202};
203
Ingo Molnar57a55872006-01-09 20:52:26 -0800204struct itimerval {
205 struct timeval it_interval; /* timer interval */
206 struct timeval it_value; /* current value */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207};
208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209/*
Ingo Molnar57a55872006-01-09 20:52:26 -0800210 * The IDs of the various system clocks (for POSIX.1b interval timers):
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 */
Ingo Molnar1ad106c2006-01-09 20:52:25 -0800212#define CLOCK_REALTIME 0
213#define CLOCK_MONOTONIC 1
214#define CLOCK_PROCESS_CPUTIME_ID 2
215#define CLOCK_THREAD_CPUTIME_ID 3
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
217/*
Ingo Molnar57a55872006-01-09 20:52:26 -0800218 * The IDs of various hardware clocks:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 */
Ingo Molnar1ad106c2006-01-09 20:52:25 -0800220#define CLOCK_SGI_CYCLE 10
221#define MAX_CLOCKS 16
222#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
223#define CLOCKS_MONO CLOCK_MONOTONIC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225/*
Ingo Molnar57a55872006-01-09 20:52:26 -0800226 * The various flags for setting POSIX.1b interval timers:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 */
Ingo Molnar1ad106c2006-01-09 20:52:25 -0800228#define TIMER_ABSTIME 0x01
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230#endif