4 # include <linux/cache.h>
5 # include <linux/seqlock.h>
6 # include <linux/math64.h>
7 # include <linux/time64.h>
9 extern struct timezone sys_tz
;
11 #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
13 static inline int timespec_equal(const struct timespec
*a
,
14 const struct timespec
*b
)
16 return (a
->tv_sec
== b
->tv_sec
) && (a
->tv_nsec
== b
->tv_nsec
);
20 * lhs < rhs: return <0
21 * lhs == rhs: return 0
22 * lhs > rhs: return >0
24 static inline int timespec_compare(const struct timespec
*lhs
, const struct timespec
*rhs
)
26 if (lhs
->tv_sec
< rhs
->tv_sec
)
28 if (lhs
->tv_sec
> rhs
->tv_sec
)
30 return lhs
->tv_nsec
- rhs
->tv_nsec
;
33 static inline int timeval_compare(const struct timeval
*lhs
, const struct timeval
*rhs
)
35 if (lhs
->tv_sec
< rhs
->tv_sec
)
37 if (lhs
->tv_sec
> rhs
->tv_sec
)
39 return lhs
->tv_usec
- rhs
->tv_usec
;
42 extern unsigned long mktime(const unsigned int year
, const unsigned int mon
,
43 const unsigned int day
, const unsigned int hour
,
44 const unsigned int min
, const unsigned int sec
);
46 extern void set_normalized_timespec(struct timespec
*ts
, time_t sec
, s64 nsec
);
49 * timespec_add_safe assumes both values are positive and checks
50 * for overflow. It will return TIME_T_MAX if the reutrn would be
51 * smaller then either of the arguments.
53 extern struct timespec
timespec_add_safe(const struct timespec lhs
,
54 const struct timespec rhs
);
57 static inline struct timespec
timespec_add(struct timespec lhs
,
60 struct timespec ts_delta
;
61 set_normalized_timespec(&ts_delta
, lhs
.tv_sec
+ rhs
.tv_sec
,
62 lhs
.tv_nsec
+ rhs
.tv_nsec
);
67 * sub = lhs - rhs, in normalized form
69 static inline struct timespec
timespec_sub(struct timespec lhs
,
72 struct timespec ts_delta
;
73 set_normalized_timespec(&ts_delta
, lhs
.tv_sec
- rhs
.tv_sec
,
74 lhs
.tv_nsec
- rhs
.tv_nsec
);
79 * Returns true if the timespec is norm, false if denorm:
81 static inline bool timespec_valid(const struct timespec
*ts
)
83 /* Dates before 1970 are bogus */
86 /* Can't have more nanoseconds then a second */
87 if ((unsigned long)ts
->tv_nsec
>= NSEC_PER_SEC
)
92 static inline bool timespec_valid_strict(const struct timespec
*ts
)
94 if (!timespec_valid(ts
))
96 /* Disallow values that could overflow ktime_t */
97 if ((unsigned long long)ts
->tv_sec
>= KTIME_SEC_MAX
)
102 extern struct timespec
timespec_trunc(struct timespec t
, unsigned gran
);
104 #define CURRENT_TIME (current_kernel_time())
105 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 })
107 /* Some architectures do not supply their own clocksource.
108 * This is mainly the case in architectures that get their
109 * inter-tick times by reading the counter on their interval
110 * timer. Since these timers wrap every tick, they're not really
111 * useful as clocksources. Wrapping them to act like one is possible
112 * but not very efficient. So we provide a callout these arches
113 * can implement for use with the jiffies clocksource to provide
114 * finer then tick granular time.
116 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
117 extern u32 (*arch_gettimeoffset
)(void);
121 extern int do_setitimer(int which
, struct itimerval
*value
,
122 struct itimerval
*ovalue
);
123 extern int do_getitimer(int which
, struct itimerval
*value
);
125 extern unsigned int alarm_setitimer(unsigned int seconds
);
127 extern long do_utimes(int dfd
, const char __user
*filename
, struct timespec
*times
, int flags
);
130 extern void do_sys_times(struct tms
*);
133 * Similar to the struct tm in userspace <time.h>, but it needs to be here so
134 * that the kernel source is self contained.
138 * the number of seconds after the minute, normally in the range
139 * 0 to 59, but can be up to 60 to allow for leap seconds
142 /* the number of minutes after the hour, in the range 0 to 59*/
144 /* the number of hours past midnight, in the range 0 to 23 */
146 /* the day of the month, in the range 1 to 31 */
148 /* the number of months since January, in the range 0 to 11 */
150 /* the number of years since 1900 */
152 /* the number of days since Sunday, in the range 0 to 6 */
154 /* the number of days since January 1, in the range 0 to 365 */
158 void time_to_tm(time_t totalsecs
, int offset
, struct tm
*result
);
161 * timespec_to_ns - Convert timespec to nanoseconds
162 * @ts: pointer to the timespec variable to be converted
164 * Returns the scalar nanosecond representation of the timespec
167 static inline s64
timespec_to_ns(const struct timespec
*ts
)
169 return ((s64
) ts
->tv_sec
* NSEC_PER_SEC
) + ts
->tv_nsec
;
173 * timeval_to_ns - Convert timeval to nanoseconds
174 * @ts: pointer to the timeval variable to be converted
176 * Returns the scalar nanosecond representation of the timeval
179 static inline s64
timeval_to_ns(const struct timeval
*tv
)
181 return ((s64
) tv
->tv_sec
* NSEC_PER_SEC
) +
182 tv
->tv_usec
* NSEC_PER_USEC
;
186 * ns_to_timespec - Convert nanoseconds to timespec
187 * @nsec: the nanoseconds value to be converted
189 * Returns the timespec representation of the nsec parameter.
191 extern struct timespec
ns_to_timespec(const s64 nsec
);
194 * ns_to_timeval - Convert nanoseconds to timeval
195 * @nsec: the nanoseconds value to be converted
197 * Returns the timeval representation of the nsec parameter.
199 extern struct timeval
ns_to_timeval(const s64 nsec
);
202 * timespec_add_ns - Adds nanoseconds to a timespec
203 * @a: pointer to timespec to be incremented
204 * @ns: unsigned nanoseconds value to be added
206 * This must always be inlined because its used from the x86-64 vdso,
207 * which cannot call other kernel functions.
209 static __always_inline
void timespec_add_ns(struct timespec
*a
, u64 ns
)
211 a
->tv_sec
+= __iter_div_u64_rem(a
->tv_nsec
+ ns
, NSEC_PER_SEC
, &ns
);
This page took 0.036721 seconds and 5 git commands to generate.