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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__
Ingo Molnar57a55872006-01-09 20:52:26 -08007# include <linux/seqlock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#endif
9
10#ifndef _STRUCT_TIMESPEC
11#define _STRUCT_TIMESPEC
12struct timespec {
13 time_t tv_sec; /* seconds */
14 long tv_nsec; /* nanoseconds */
15};
Ingo Molnar57a55872006-01-09 20:52:26 -080016#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
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
Ingo Molnar57a55872006-01-09 20:52:26 -080030/* Parameters used to convert the timespec values: */
Vojtech Pavlik05ebb762006-06-26 13:58:20 +020031#define MSEC_PER_SEC 1000L
32#define USEC_PER_MSEC 1000L
33#define NSEC_PER_USEC 1000L
34#define NSEC_PER_MSEC 1000000L
35#define USEC_PER_SEC 1000000L
36#define NSEC_PER_SEC 1000000000L
37#define FSEC_PER_SEC 1000000000000000L
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Andrew Morton643a6542006-02-11 17:55:52 -080039static inline int timespec_equal(struct timespec *a, struct timespec *b)
Ingo Molnar57a55872006-01-09 20:52:26 -080040{
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
Ingo Molnar57a55872006-01-09 20:52:26 -080042}
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
Andrew Morton643a6542006-02-11 17:55:52 -080044/*
45 * lhs < rhs: return <0
46 * lhs == rhs: return 0
47 * lhs > rhs: return >0
48 */
Rolf Eike Beer77adbfb2007-02-10 01:45:49 -080049static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
Andrew Morton643a6542006-02-11 17:55:52 -080050{
51 if (lhs->tv_sec < rhs->tv_sec)
52 return -1;
53 if (lhs->tv_sec > rhs->tv_sec)
54 return 1;
55 return lhs->tv_nsec - rhs->tv_nsec;
56}
57
Rolf Eike Beer77adbfb2007-02-10 01:45:49 -080058static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
Andrew Morton643a6542006-02-11 17:55:52 -080059{
60 if (lhs->tv_sec < rhs->tv_sec)
61 return -1;
62 if (lhs->tv_sec > rhs->tv_sec)
63 return 1;
64 return lhs->tv_usec - rhs->tv_usec;
65}
66
Ingo Molnarf4818902006-01-09 20:52:23 -080067extern unsigned long mktime(const unsigned int year, const unsigned int mon,
68 const unsigned int day, const unsigned int hour,
69 const unsigned int min, const unsigned int sec);
70
71extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Thomas Gleixner5f82b2b2006-01-09 20:52:29 -080073/*
Shailabh Nagarca74e922006-07-14 00:24:36 -070074 * sub = lhs - rhs, in normalized form
75 */
76static inline struct timespec timespec_sub(struct timespec lhs,
77 struct timespec rhs)
78{
79 struct timespec ts_delta;
80 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
81 lhs.tv_nsec - rhs.tv_nsec);
82 return ts_delta;
83}
84
85/*
Thomas Gleixner5f82b2b2006-01-09 20:52:29 -080086 * Returns true if the timespec is norm, false if denorm:
87 */
88#define timespec_valid(ts) \
Chris Wrightbd3f8f22006-01-31 19:10:23 -080089 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
Thomas Gleixner5f82b2b2006-01-09 20:52:29 -080090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091extern struct timespec xtime;
92extern struct timespec wall_to_monotonic;
Eric Dumazet5809f9d2007-02-13 13:26:21 +010093extern seqlock_t xtime_lock __attribute__((weak));
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
John Stultz411187f2007-02-16 01:27:30 -080095extern unsigned long read_persistent_clock(void);
john stultzad596172006-06-26 00:25:06 -070096void timekeeping_init(void);
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098static inline unsigned long get_seconds(void)
Ingo Molnar57a55872006-01-09 20:52:26 -080099{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 return xtime.tv_sec;
101}
102
103struct timespec current_kernel_time(void);
104
Ingo Molnar57a55872006-01-09 20:52:26 -0800105#define CURRENT_TIME (current_kernel_time())
106#define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
john stultzcf3c7692006-06-26 00:25:08 -0700121extern int timekeeping_is_continuous(void);
john stultz85240702007-05-08 00:27:59 -0700122extern void update_wall_time(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800124/**
125 * timespec_to_ns - Convert timespec to nanoseconds
126 * @ts: pointer to the timespec variable to be converted
127 *
128 * Returns the scalar nanosecond representation of the timespec
129 * parameter.
130 */
Roman Zippeldf869b62006-03-26 01:38:11 -0800131static inline s64 timespec_to_ns(const struct timespec *ts)
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800132{
Roman Zippeldf869b62006-03-26 01:38:11 -0800133 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800134}
135
136/**
137 * timeval_to_ns - Convert timeval to nanoseconds
138 * @ts: pointer to the timeval variable to be converted
139 *
140 * Returns the scalar nanosecond representation of the timeval
141 * parameter.
142 */
Roman Zippeldf869b62006-03-26 01:38:11 -0800143static inline s64 timeval_to_ns(const struct timeval *tv)
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800144{
Roman Zippeldf869b62006-03-26 01:38:11 -0800145 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800146 tv->tv_usec * NSEC_PER_USEC;
147}
148
149/**
150 * ns_to_timespec - Convert nanoseconds to timespec
151 * @nsec: the nanoseconds value to be converted
152 *
153 * Returns the timespec representation of the nsec parameter.
154 */
Roman Zippeldf869b62006-03-26 01:38:11 -0800155extern struct timespec ns_to_timespec(const s64 nsec);
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800156
157/**
158 * ns_to_timeval - Convert nanoseconds to timeval
159 * @nsec: the nanoseconds value to be converted
160 *
161 * Returns the timeval representation of the nsec parameter.
162 */
Roman Zippeldf869b62006-03-26 01:38:11 -0800163extern struct timeval ns_to_timeval(const s64 nsec);
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800164
john stultzcf3c7692006-06-26 00:25:08 -0700165/**
166 * timespec_add_ns - Adds nanoseconds to a timespec
167 * @a: pointer to timespec to be incremented
168 * @ns: unsigned nanoseconds value to be added
169 */
170static inline void timespec_add_ns(struct timespec *a, u64 ns)
171{
172 ns += a->tv_nsec;
173 while(unlikely(ns >= NSEC_PER_SEC)) {
174 ns -= NSEC_PER_SEC;
175 a->tv_sec++;
176 }
177 a->tv_nsec = ns;
178}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179#endif /* __KERNEL__ */
180
181#define NFDBITS __NFDBITS
182
183#define FD_SETSIZE __FD_SETSIZE
184#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
185#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
186#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
187#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
188
189/*
190 * Names of the interval timers, and structure
Ingo Molnar57a55872006-01-09 20:52:26 -0800191 * defining a timer setting:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 */
Ingo Molnar57a55872006-01-09 20:52:26 -0800193#define ITIMER_REAL 0
194#define ITIMER_VIRTUAL 1
195#define ITIMER_PROF 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
Ingo Molnar57a55872006-01-09 20:52:26 -0800197struct itimerspec {
198 struct timespec it_interval; /* timer period */
199 struct timespec it_value; /* timer expiration */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200};
201
Ingo Molnar57a55872006-01-09 20:52:26 -0800202struct itimerval {
203 struct timeval it_interval; /* timer interval */
204 struct timeval it_value; /* current value */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205};
206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207/*
Ingo Molnar57a55872006-01-09 20:52:26 -0800208 * The IDs of the various system clocks (for POSIX.1b interval timers):
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 */
Ingo Molnar1ad106c2006-01-09 20:52:25 -0800210#define CLOCK_REALTIME 0
211#define CLOCK_MONOTONIC 1
212#define CLOCK_PROCESS_CPUTIME_ID 2
213#define CLOCK_THREAD_CPUTIME_ID 3
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
215/*
Ingo Molnar57a55872006-01-09 20:52:26 -0800216 * The IDs of various hardware clocks:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 */
Ingo Molnar1ad106c2006-01-09 20:52:25 -0800218#define CLOCK_SGI_CYCLE 10
219#define MAX_CLOCKS 16
220#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
221#define CLOCKS_MONO CLOCK_MONOTONIC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
223/*
Ingo Molnar57a55872006-01-09 20:52:26 -0800224 * The various flags for setting POSIX.1b interval timers:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 */
Ingo Molnar1ad106c2006-01-09 20:52:25 -0800226#define TIMER_ABSTIME 0x01
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228#endif