4 #include <linux/types.h>
7 # include <linux/cache.h>
8 # include <linux/seqlock.h>
11 #ifndef _STRUCT_TIMESPEC
12 #define _STRUCT_TIMESPEC
14 time_t tv_sec; /* seconds */
15 long tv_nsec; /* nanoseconds */
20 time_t tv_sec; /* seconds */
21 suseconds_t tv_usec; /* microseconds */
25 int tz_minuteswest; /* minutes west of Greenwich */
26 int tz_dsttime; /* type of dst correction */
31 /* Parameters used to convert the timespec values: */
32 #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
40 static inline int timespec_equal(const struct timespec *a,
41 const struct timespec *b)
43 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
47 * lhs < rhs: return <0
48 * lhs == rhs: return 0
49 * lhs > rhs: return >0
51 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
53 if (lhs->tv_sec < rhs->tv_sec)
55 if (lhs->tv_sec > rhs->tv_sec)
57 return lhs->tv_nsec - rhs->tv_nsec;
60 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
62 if (lhs->tv_sec < rhs->tv_sec)
64 if (lhs->tv_sec > rhs->tv_sec)
66 return lhs->tv_usec - rhs->tv_usec;
69 extern 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);
73 extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec);
76 * sub = lhs - rhs, in normalized form
78 static inline struct timespec timespec_sub(struct timespec lhs,
81 struct timespec ts_delta;
82 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
83 lhs.tv_nsec - rhs.tv_nsec);
88 * Returns true if the timespec is norm, false if denorm:
90 #define timespec_valid(ts) \
91 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
93 extern struct timespec xtime;
94 extern struct timespec wall_to_monotonic;
95 extern seqlock_t xtime_lock;
97 extern unsigned long read_persistent_clock(void);
98 extern int update_persistent_clock(struct timespec now);
99 extern int no_sync_cmos_clock __read_mostly;
100 void timekeeping_init(void);
102 unsigned long get_seconds(void);
103 struct timespec current_kernel_time(void);
105 #define CURRENT_TIME (current_kernel_time())
106 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
108 extern void do_gettimeofday(struct timeval *tv);
109 extern int do_settimeofday(struct timespec *tv);
110 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz);
111 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
112 extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags);
114 extern int do_setitimer(int which, struct itimerval *value,
115 struct itimerval *ovalue);
116 extern unsigned int alarm_setitimer(unsigned int seconds);
117 extern int do_getitimer(int which, struct itimerval *value);
118 extern void getnstimeofday(struct timespec *tv);
119 extern void getboottime(struct timespec *ts);
120 extern void monotonic_to_bootbased(struct timespec *ts);
122 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
123 extern int timekeeping_valid_for_hres(void);
124 extern void update_wall_time(void);
125 extern void update_xtime_cache(u64 nsec);
128 * timespec_to_ns - Convert timespec to nanoseconds
129 * @ts: pointer to the timespec variable to be converted
131 * Returns the scalar nanosecond representation of the timespec
134 static inline s64 timespec_to_ns(const struct timespec *ts)
136 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
140 * timeval_to_ns - Convert timeval to nanoseconds
141 * @ts: pointer to the timeval variable to be converted
143 * Returns the scalar nanosecond representation of the timeval
146 static inline s64 timeval_to_ns(const struct timeval *tv)
148 return ((s64) tv->tv_sec * NSEC_PER_SEC) +
149 tv->tv_usec * NSEC_PER_USEC;
153 * ns_to_timespec - Convert nanoseconds to timespec
154 * @nsec: the nanoseconds value to be converted
156 * Returns the timespec representation of the nsec parameter.
158 extern struct timespec ns_to_timespec(const s64 nsec);
161 * ns_to_timeval - Convert nanoseconds to timeval
162 * @nsec: the nanoseconds value to be converted
164 * Returns the timeval representation of the nsec parameter.
166 extern struct timeval ns_to_timeval(const s64 nsec);
169 * timespec_add_ns - Adds nanoseconds to a timespec
170 * @a: pointer to timespec to be incremented
171 * @ns: unsigned nanoseconds value to be added
173 static inline void timespec_add_ns(struct timespec *a, u64 ns)
176 while(unlikely(ns >= NSEC_PER_SEC)) {
177 /* The following asm() prevents the compiler from
178 * optimising this loop into a modulo operation. */
186 #endif /* __KERNEL__ */
188 #define NFDBITS __NFDBITS
190 #define FD_SETSIZE __FD_SETSIZE
191 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
192 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
193 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
194 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
197 * Names of the interval timers, and structure
198 * defining a timer setting:
200 #define ITIMER_REAL 0
201 #define ITIMER_VIRTUAL 1
202 #define ITIMER_PROF 2
205 struct timespec it_interval; /* timer period */
206 struct timespec it_value; /* timer expiration */
210 struct timeval it_interval; /* timer interval */
211 struct timeval it_value; /* current value */
215 * The IDs of the various system clocks (for POSIX.1b interval timers):
217 #define CLOCK_REALTIME 0
218 #define CLOCK_MONOTONIC 1
219 #define CLOCK_PROCESS_CPUTIME_ID 2
220 #define CLOCK_THREAD_CPUTIME_ID 3
223 * The IDs of various hardware clocks:
225 #define CLOCK_SGI_CYCLE 10
226 #define MAX_CLOCKS 16
227 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
228 #define CLOCKS_MONO CLOCK_MONOTONIC
231 * The various flags for setting POSIX.1b interval timers:
233 #define TIMER_ABSTIME 0x01