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
__attribute__((weak
));
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 static inline unsigned long get_seconds(void)
107 struct timespec
current_kernel_time(void);
109 #define CURRENT_TIME (current_kernel_time())
110 #define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 })
112 extern void do_gettimeofday(struct timeval
*tv
);
113 extern int do_settimeofday(struct timespec
*tv
);
114 extern int do_sys_settimeofday(struct timespec
*tv
, struct timezone
*tz
);
115 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
116 extern long do_utimes(int dfd
, char __user
*filename
, struct timespec
*times
, int flags
);
118 extern int do_setitimer(int which
, struct itimerval
*value
,
119 struct itimerval
*ovalue
);
120 extern unsigned int alarm_setitimer(unsigned int seconds
);
121 extern int do_getitimer(int which
, struct itimerval
*value
);
122 extern void getnstimeofday(struct timespec
*tv
);
123 extern void getboottime(struct timespec
*ts
);
124 extern void monotonic_to_bootbased(struct timespec
*ts
);
126 extern struct timespec
timespec_trunc(struct timespec t
, unsigned gran
);
127 extern int timekeeping_is_continuous(void);
128 extern void update_wall_time(void);
131 * timespec_to_ns - Convert timespec to nanoseconds
132 * @ts: pointer to the timespec variable to be converted
134 * Returns the scalar nanosecond representation of the timespec
137 static inline s64
timespec_to_ns(const struct timespec
*ts
)
139 return ((s64
) ts
->tv_sec
* NSEC_PER_SEC
) + ts
->tv_nsec
;
143 * timeval_to_ns - Convert timeval to nanoseconds
144 * @ts: pointer to the timeval variable to be converted
146 * Returns the scalar nanosecond representation of the timeval
149 static inline s64
timeval_to_ns(const struct timeval
*tv
)
151 return ((s64
) tv
->tv_sec
* NSEC_PER_SEC
) +
152 tv
->tv_usec
* NSEC_PER_USEC
;
156 * ns_to_timespec - Convert nanoseconds to timespec
157 * @nsec: the nanoseconds value to be converted
159 * Returns the timespec representation of the nsec parameter.
161 extern struct timespec
ns_to_timespec(const s64 nsec
);
164 * ns_to_timeval - Convert nanoseconds to timeval
165 * @nsec: the nanoseconds value to be converted
167 * Returns the timeval representation of the nsec parameter.
169 extern struct timeval
ns_to_timeval(const s64 nsec
);
172 * timespec_add_ns - Adds nanoseconds to a timespec
173 * @a: pointer to timespec to be incremented
174 * @ns: unsigned nanoseconds value to be added
176 static inline void timespec_add_ns(struct timespec
*a
, u64 ns
)
179 while(unlikely(ns
>= NSEC_PER_SEC
)) {
185 #endif /* __KERNEL__ */
187 #define NFDBITS __NFDBITS
189 #define FD_SETSIZE __FD_SETSIZE
190 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
191 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
192 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
193 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
196 * Names of the interval timers, and structure
197 * defining a timer setting:
199 #define ITIMER_REAL 0
200 #define ITIMER_VIRTUAL 1
201 #define ITIMER_PROF 2
204 struct timespec it_interval
; /* timer period */
205 struct timespec it_value
; /* timer expiration */
209 struct timeval it_interval
; /* timer interval */
210 struct timeval it_value
; /* current value */
214 * The IDs of the various system clocks (for POSIX.1b interval timers):
216 #define CLOCK_REALTIME 0
217 #define CLOCK_MONOTONIC 1
218 #define CLOCK_PROCESS_CPUTIME_ID 2
219 #define CLOCK_THREAD_CPUTIME_ID 3
222 * The IDs of various hardware clocks:
224 #define CLOCK_SGI_CYCLE 10
225 #define MAX_CLOCKS 16
226 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
227 #define CLOCKS_MONO CLOCK_MONOTONIC
230 * The various flags for setting POSIX.1b interval timers:
232 #define TIMER_ABSTIME 0x01