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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: */
31#define MSEC_PER_SEC 1000L
32#define USEC_PER_SEC 1000000L
33#define NSEC_PER_SEC 1000000000L
34#define NSEC_PER_USEC 1000L
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Andrew Morton643a6542006-02-11 17:55:52 -080036static inline int timespec_equal(struct timespec *a, struct timespec *b)
Ingo Molnar57a55872006-01-09 20:52:26 -080037{
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
Ingo Molnar57a55872006-01-09 20:52:26 -080039}
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Andrew Morton643a6542006-02-11 17:55:52 -080041/*
42 * lhs < rhs: return <0
43 * lhs == rhs: return 0
44 * lhs > rhs: return >0
45 */
46static inline int timespec_compare(struct timespec *lhs, struct timespec *rhs)
47{
48 if (lhs->tv_sec < rhs->tv_sec)
49 return -1;
50 if (lhs->tv_sec > rhs->tv_sec)
51 return 1;
52 return lhs->tv_nsec - rhs->tv_nsec;
53}
54
55static inline int timeval_compare(struct timeval *lhs, struct timeval *rhs)
56{
57 if (lhs->tv_sec < rhs->tv_sec)
58 return -1;
59 if (lhs->tv_sec > rhs->tv_sec)
60 return 1;
61 return lhs->tv_usec - rhs->tv_usec;
62}
63
Ingo Molnarf4818902006-01-09 20:52:23 -080064extern unsigned long mktime(const unsigned int year, const unsigned int mon,
65 const unsigned int day, const unsigned int hour,
66 const unsigned int min, const unsigned int sec);
67
68extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Thomas Gleixner5f82b2b2006-01-09 20:52:29 -080070/*
71 * Returns true if the timespec is norm, false if denorm:
72 */
73#define timespec_valid(ts) \
Chris Wrightbd3f8f22006-01-31 19:10:23 -080074 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
Thomas Gleixner5f82b2b2006-01-09 20:52:29 -080075
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -080076/*
77 * 64-bit nanosec type. Large enough to span 292+ years in nanosecond
78 * resolution. Ought to be enough for a while.
79 */
80typedef s64 nsec_t;
81
Linus Torvalds1da177e2005-04-16 15:20:36 -070082extern struct timespec xtime;
83extern struct timespec wall_to_monotonic;
84extern seqlock_t xtime_lock;
85
86static inline unsigned long get_seconds(void)
Ingo Molnar57a55872006-01-09 20:52:26 -080087{
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 return xtime.tv_sec;
89}
90
91struct timespec current_kernel_time(void);
92
Ingo Molnar57a55872006-01-09 20:52:26 -080093#define CURRENT_TIME (current_kernel_time())
94#define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 })
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96extern void do_gettimeofday(struct timeval *tv);
97extern int do_settimeofday(struct timespec *tv);
98extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -080099#define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800100extern long do_utimes(int dfd, char __user *filename, struct timeval *times);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101struct itimerval;
Ingo Molnar57a55872006-01-09 20:52:26 -0800102extern int do_setitimer(int which, struct itimerval *value,
103 struct itimerval *ovalue);
Thomas Gleixnerc08b8a42006-03-25 03:06:33 -0800104extern unsigned int alarm_setitimer(unsigned int seconds);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105extern int do_getitimer(int which, struct itimerval *value);
Ingo Molnar57a55872006-01-09 20:52:26 -0800106extern void getnstimeofday(struct timespec *tv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
108extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
109
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800110/**
111 * timespec_to_ns - Convert timespec to nanoseconds
112 * @ts: pointer to the timespec variable to be converted
113 *
114 * Returns the scalar nanosecond representation of the timespec
115 * parameter.
116 */
117static inline nsec_t timespec_to_ns(const struct timespec *ts)
118{
119 return ((nsec_t) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
120}
121
122/**
123 * timeval_to_ns - Convert timeval to nanoseconds
124 * @ts: pointer to the timeval variable to be converted
125 *
126 * Returns the scalar nanosecond representation of the timeval
127 * parameter.
128 */
129static inline nsec_t timeval_to_ns(const struct timeval *tv)
130{
131 return ((nsec_t) tv->tv_sec * NSEC_PER_SEC) +
132 tv->tv_usec * NSEC_PER_USEC;
133}
134
135/**
136 * ns_to_timespec - Convert nanoseconds to timespec
137 * @nsec: the nanoseconds value to be converted
138 *
139 * Returns the timespec representation of the nsec parameter.
140 */
141extern struct timespec ns_to_timespec(const nsec_t nsec);
142
143/**
144 * ns_to_timeval - Convert nanoseconds to timeval
145 * @nsec: the nanoseconds value to be converted
146 *
147 * Returns the timeval representation of the nsec parameter.
148 */
149extern struct timeval ns_to_timeval(const nsec_t nsec);
150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151#endif /* __KERNEL__ */
152
153#define NFDBITS __NFDBITS
154
155#define FD_SETSIZE __FD_SETSIZE
156#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
157#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
158#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
159#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
160
161/*
162 * Names of the interval timers, and structure
Ingo Molnar57a55872006-01-09 20:52:26 -0800163 * defining a timer setting:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 */
Ingo Molnar57a55872006-01-09 20:52:26 -0800165#define ITIMER_REAL 0
166#define ITIMER_VIRTUAL 1
167#define ITIMER_PROF 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Ingo Molnar57a55872006-01-09 20:52:26 -0800169struct itimerspec {
170 struct timespec it_interval; /* timer period */
171 struct timespec it_value; /* timer expiration */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172};
173
Ingo Molnar57a55872006-01-09 20:52:26 -0800174struct itimerval {
175 struct timeval it_interval; /* timer interval */
176 struct timeval it_value; /* current value */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177};
178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179/*
Ingo Molnar57a55872006-01-09 20:52:26 -0800180 * The IDs of the various system clocks (for POSIX.1b interval timers):
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 */
Ingo Molnar1ad106c2006-01-09 20:52:25 -0800182#define CLOCK_REALTIME 0
183#define CLOCK_MONOTONIC 1
184#define CLOCK_PROCESS_CPUTIME_ID 2
185#define CLOCK_THREAD_CPUTIME_ID 3
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
187/*
Ingo Molnar57a55872006-01-09 20:52:26 -0800188 * The IDs of various hardware clocks:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 */
Ingo Molnar1ad106c2006-01-09 20:52:25 -0800190#define CLOCK_SGI_CYCLE 10
191#define MAX_CLOCKS 16
192#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
193#define CLOCKS_MONO CLOCK_MONOTONIC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
195/*
Ingo Molnar57a55872006-01-09 20:52:26 -0800196 * The various flags for setting POSIX.1b interval timers:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 */
Ingo Molnar1ad106c2006-01-09 20:52:25 -0800198#define TIMER_ABSTIME 0x01
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
200#endif