4 #include <linux/types.h>
7 # include <linux/cache.h>
8 # include <linux/seqlock.h>
9 # include <linux/math64.h>
12 #ifndef _STRUCT_TIMESPEC
13 #define _STRUCT_TIMESPEC
15 time_t tv_sec
; /* seconds */
16 long tv_nsec
; /* nanoseconds */
21 time_t tv_sec
; /* seconds */
22 suseconds_t tv_usec
; /* microseconds */
26 int tz_minuteswest
; /* minutes west of Greenwich */
27 int tz_dsttime
; /* type of dst correction */
32 extern struct timezone sys_tz
;
34 /* Parameters used to convert the timespec values: */
35 #define MSEC_PER_SEC 1000L
36 #define USEC_PER_MSEC 1000L
37 #define NSEC_PER_USEC 1000L
38 #define NSEC_PER_MSEC 1000000L
39 #define USEC_PER_SEC 1000000L
40 #define NSEC_PER_SEC 1000000000L
41 #define FSEC_PER_SEC 1000000000000000L
43 #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
45 static inline int timespec_equal(const struct timespec
*a
,
46 const struct timespec
*b
)
48 return (a
->tv_sec
== b
->tv_sec
) && (a
->tv_nsec
== b
->tv_nsec
);
52 * lhs < rhs: return <0
53 * lhs == rhs: return 0
54 * lhs > rhs: return >0
56 static inline int timespec_compare(const struct timespec
*lhs
, const struct timespec
*rhs
)
58 if (lhs
->tv_sec
< rhs
->tv_sec
)
60 if (lhs
->tv_sec
> rhs
->tv_sec
)
62 return lhs
->tv_nsec
- rhs
->tv_nsec
;
65 static inline int timeval_compare(const struct timeval
*lhs
, const struct timeval
*rhs
)
67 if (lhs
->tv_sec
< rhs
->tv_sec
)
69 if (lhs
->tv_sec
> rhs
->tv_sec
)
71 return lhs
->tv_usec
- rhs
->tv_usec
;
74 extern unsigned long mktime(const unsigned int year
, const unsigned int mon
,
75 const unsigned int day
, const unsigned int hour
,
76 const unsigned int min
, const unsigned int sec
);
78 extern void set_normalized_timespec(struct timespec
*ts
, time_t sec
, long nsec
);
79 extern struct timespec
timespec_add_safe(const struct timespec lhs
,
80 const struct timespec rhs
);
83 * sub = lhs - rhs, in normalized form
85 static inline struct timespec
timespec_sub(struct timespec lhs
,
88 struct timespec ts_delta
;
89 set_normalized_timespec(&ts_delta
, lhs
.tv_sec
- rhs
.tv_sec
,
90 lhs
.tv_nsec
- rhs
.tv_nsec
);
95 * Returns true if the timespec is norm, false if denorm:
97 #define timespec_valid(ts) \
98 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC))
100 extern struct timespec xtime
;
101 extern struct timespec wall_to_monotonic
;
102 extern seqlock_t xtime_lock
;
104 extern unsigned long read_persistent_clock(void);
105 extern int update_persistent_clock(struct timespec now
);
106 extern int no_sync_cmos_clock __read_mostly
;
107 void timekeeping_init(void);
109 unsigned long get_seconds(void);
110 struct timespec
current_kernel_time(void);
112 #define CURRENT_TIME (current_kernel_time())
113 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
115 extern void do_gettimeofday(struct timeval
*tv
);
116 extern int do_settimeofday(struct timespec
*tv
);
117 extern int do_sys_settimeofday(struct timespec
*tv
, struct timezone
*tz
);
118 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
119 extern long do_utimes(int dfd
, char __user
*filename
, struct timespec
*times
, int flags
);
121 extern int do_setitimer(int which
, struct itimerval
*value
,
122 struct itimerval
*ovalue
);
123 extern unsigned int alarm_setitimer(unsigned int seconds
);
124 extern int do_getitimer(int which
, struct itimerval
*value
);
125 extern void getnstimeofday(struct timespec
*tv
);
126 extern void getrawmonotonic(struct timespec
*ts
);
127 extern void getboottime(struct timespec
*ts
);
128 extern void monotonic_to_bootbased(struct timespec
*ts
);
130 extern struct timespec
timespec_trunc(struct timespec t
, unsigned gran
);
131 extern int timekeeping_valid_for_hres(void);
132 extern void update_wall_time(void);
133 extern void update_xtime_cache(u64 nsec
);
136 extern void do_sys_times(struct tms
*);
139 * timespec_to_ns - Convert timespec to nanoseconds
140 * @ts: pointer to the timespec variable to be converted
142 * Returns the scalar nanosecond representation of the timespec
145 static inline s64
timespec_to_ns(const struct timespec
*ts
)
147 return ((s64
) ts
->tv_sec
* NSEC_PER_SEC
) + ts
->tv_nsec
;
151 * timeval_to_ns - Convert timeval to nanoseconds
152 * @ts: pointer to the timeval variable to be converted
154 * Returns the scalar nanosecond representation of the timeval
157 static inline s64
timeval_to_ns(const struct timeval
*tv
)
159 return ((s64
) tv
->tv_sec
* NSEC_PER_SEC
) +
160 tv
->tv_usec
* NSEC_PER_USEC
;
164 * ns_to_timespec - Convert nanoseconds to timespec
165 * @nsec: the nanoseconds value to be converted
167 * Returns the timespec representation of the nsec parameter.
169 extern struct timespec
ns_to_timespec(const s64 nsec
);
172 * ns_to_timeval - Convert nanoseconds to timeval
173 * @nsec: the nanoseconds value to be converted
175 * Returns the timeval representation of the nsec parameter.
177 extern struct timeval
ns_to_timeval(const s64 nsec
);
180 * timespec_add_ns - Adds nanoseconds to a timespec
181 * @a: pointer to timespec to be incremented
182 * @ns: unsigned nanoseconds value to be added
184 * This must always be inlined because its used from the x86-64 vdso,
185 * which cannot call other kernel functions.
187 static __always_inline
void timespec_add_ns(struct timespec
*a
, u64 ns
)
189 a
->tv_sec
+= __iter_div_u64_rem(a
->tv_nsec
+ ns
, NSEC_PER_SEC
, &ns
);
192 #endif /* __KERNEL__ */
194 #define NFDBITS __NFDBITS
196 #define FD_SETSIZE __FD_SETSIZE
197 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
198 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
199 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
200 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
203 * Names of the interval timers, and structure
204 * defining a timer setting:
206 #define ITIMER_REAL 0
207 #define ITIMER_VIRTUAL 1
208 #define ITIMER_PROF 2
211 struct timespec it_interval
; /* timer period */
212 struct timespec it_value
; /* timer expiration */
216 struct timeval it_interval
; /* timer interval */
217 struct timeval it_value
; /* current value */
221 * The IDs of the various system clocks (for POSIX.1b interval timers):
223 #define CLOCK_REALTIME 0
224 #define CLOCK_MONOTONIC 1
225 #define CLOCK_PROCESS_CPUTIME_ID 2
226 #define CLOCK_THREAD_CPUTIME_ID 3
227 #define CLOCK_MONOTONIC_RAW 4
230 * The IDs of various hardware clocks:
232 #define CLOCK_SGI_CYCLE 10
233 #define MAX_CLOCKS 16
234 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
235 #define CLOCKS_MONO CLOCK_MONOTONIC
238 * The various flags for setting POSIX.1b interval timers:
240 #define TIMER_ABSTIME 0x01