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TOMOYO Linux Cross Reference
Linux/include/linux/time.h

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  1 #ifndef _LINUX_TIME_H
  2 #define _LINUX_TIME_H
  3 
  4 # include <linux/cache.h>
  5 # include <linux/seqlock.h>
  6 # include <linux/math64.h>
  7 #include <uapi/linux/time.h>
  8 
  9 extern struct timezone sys_tz;
 10 
 11 /* Parameters used to convert the timespec values: */
 12 #define MSEC_PER_SEC    1000L
 13 #define USEC_PER_MSEC   1000L
 14 #define NSEC_PER_USEC   1000L
 15 #define NSEC_PER_MSEC   1000000L
 16 #define USEC_PER_SEC    1000000L
 17 #define NSEC_PER_SEC    1000000000L
 18 #define FSEC_PER_SEC    1000000000000000LL
 19 
 20 #define TIME_T_MAX      (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
 21 
 22 static inline int timespec_equal(const struct timespec *a,
 23                                  const struct timespec *b)
 24 {
 25         return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
 26 }
 27 
 28 /*
 29  * lhs < rhs:  return <0
 30  * lhs == rhs: return 0
 31  * lhs > rhs:  return >0
 32  */
 33 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
 34 {
 35         if (lhs->tv_sec < rhs->tv_sec)
 36                 return -1;
 37         if (lhs->tv_sec > rhs->tv_sec)
 38                 return 1;
 39         return lhs->tv_nsec - rhs->tv_nsec;
 40 }
 41 
 42 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
 43 {
 44         if (lhs->tv_sec < rhs->tv_sec)
 45                 return -1;
 46         if (lhs->tv_sec > rhs->tv_sec)
 47                 return 1;
 48         return lhs->tv_usec - rhs->tv_usec;
 49 }
 50 
 51 extern unsigned long mktime(const unsigned int year, const unsigned int mon,
 52                             const unsigned int day, const unsigned int hour,
 53                             const unsigned int min, const unsigned int sec);
 54 
 55 extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
 56 
 57 /*
 58  * timespec_add_safe assumes both values are positive and checks
 59  * for overflow. It will return TIME_T_MAX if the reutrn would be
 60  * smaller then either of the arguments.
 61  */
 62 extern struct timespec timespec_add_safe(const struct timespec lhs,
 63                                          const struct timespec rhs);
 64 
 65 
 66 static inline struct timespec timespec_add(struct timespec lhs,
 67                                                 struct timespec rhs)
 68 {
 69         struct timespec ts_delta;
 70         set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec,
 71                                 lhs.tv_nsec + rhs.tv_nsec);
 72         return ts_delta;
 73 }
 74 
 75 /*
 76  * sub = lhs - rhs, in normalized form
 77  */
 78 static inline struct timespec timespec_sub(struct timespec lhs,
 79                                                 struct timespec rhs)
 80 {
 81         struct timespec ts_delta;
 82         set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
 83                                 lhs.tv_nsec - rhs.tv_nsec);
 84         return ts_delta;
 85 }
 86 
 87 #define KTIME_MAX                       ((s64)~((u64)1 << 63))
 88 #if (BITS_PER_LONG == 64)
 89 # define KTIME_SEC_MAX                  (KTIME_MAX / NSEC_PER_SEC)
 90 #else
 91 # define KTIME_SEC_MAX                  LONG_MAX
 92 #endif
 93 
 94 /*
 95  * Returns true if the timespec is norm, false if denorm:
 96  */
 97 static inline bool timespec_valid(const struct timespec *ts)
 98 {
 99         /* Dates before 1970 are bogus */
100         if (ts->tv_sec < 0)
101                 return false;
102         /* Can't have more nanoseconds then a second */
103         if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
104                 return false;
105         return true;
106 }
107 
108 static inline bool timespec_valid_strict(const struct timespec *ts)
109 {
110         if (!timespec_valid(ts))
111                 return false;
112         /* Disallow values that could overflow ktime_t */
113         if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
114                 return false;
115         return true;
116 }
117 
118 extern bool persistent_clock_exist;
119 
120 static inline bool has_persistent_clock(void)
121 {
122         return persistent_clock_exist;
123 }
124 
125 extern void read_persistent_clock(struct timespec *ts);
126 extern void read_boot_clock(struct timespec *ts);
127 extern int persistent_clock_is_local;
128 extern int update_persistent_clock(struct timespec now);
129 void timekeeping_init(void);
130 extern int timekeeping_suspended;
131 
132 unsigned long get_seconds(void);
133 struct timespec current_kernel_time(void);
134 struct timespec __current_kernel_time(void); /* does not take xtime_lock */
135 struct timespec get_monotonic_coarse(void);
136 void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
137                                 struct timespec *wtom, struct timespec *sleep);
138 void timekeeping_inject_sleeptime(struct timespec *delta);
139 
140 #define CURRENT_TIME            (current_kernel_time())
141 #define CURRENT_TIME_SEC        ((struct timespec) { get_seconds(), 0 })
142 
143 /* Some architectures do not supply their own clocksource.
144  * This is mainly the case in architectures that get their
145  * inter-tick times by reading the counter on their interval
146  * timer. Since these timers wrap every tick, they're not really
147  * useful as clocksources. Wrapping them to act like one is possible
148  * but not very efficient. So we provide a callout these arches
149  * can implement for use with the jiffies clocksource to provide
150  * finer then tick granular time.
151  */
152 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
153 extern u32 (*arch_gettimeoffset)(void);
154 #endif
155 
156 extern void do_gettimeofday(struct timeval *tv);
157 extern int do_settimeofday(const struct timespec *tv);
158 extern int do_sys_settimeofday(const struct timespec *tv,
159                                const struct timezone *tz);
160 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
161 extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
162 struct itimerval;
163 extern int do_setitimer(int which, struct itimerval *value,
164                         struct itimerval *ovalue);
165 extern unsigned int alarm_setitimer(unsigned int seconds);
166 extern int do_getitimer(int which, struct itimerval *value);
167 extern int __getnstimeofday(struct timespec *tv);
168 extern void getnstimeofday(struct timespec *tv);
169 extern void getrawmonotonic(struct timespec *ts);
170 extern void getnstime_raw_and_real(struct timespec *ts_raw,
171                 struct timespec *ts_real);
172 extern void getboottime(struct timespec *ts);
173 extern void monotonic_to_bootbased(struct timespec *ts);
174 extern void get_monotonic_boottime(struct timespec *ts);
175 
176 static inline bool timeval_valid(const struct timeval *tv)
177 {
178         /* Dates before 1970 are bogus */
179         if (tv->tv_sec < 0)
180                 return false;
181 
182         /* Can't have more microseconds then a second */
183         if (tv->tv_usec < 0 || tv->tv_usec >= USEC_PER_SEC)
184                 return false;
185 
186         return true;
187 }
188 
189 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
190 extern int timekeeping_valid_for_hres(void);
191 extern u64 timekeeping_max_deferment(void);
192 extern int timekeeping_inject_offset(struct timespec *ts);
193 extern s32 timekeeping_get_tai_offset(void);
194 extern void timekeeping_set_tai_offset(s32 tai_offset);
195 extern void timekeeping_clocktai(struct timespec *ts);
196 
197 struct tms;
198 extern void do_sys_times(struct tms *);
199 
200 /*
201  * Similar to the struct tm in userspace <time.h>, but it needs to be here so
202  * that the kernel source is self contained.
203  */
204 struct tm {
205         /*
206          * the number of seconds after the minute, normally in the range
207          * 0 to 59, but can be up to 60 to allow for leap seconds
208          */
209         int tm_sec;
210         /* the number of minutes after the hour, in the range 0 to 59*/
211         int tm_min;
212         /* the number of hours past midnight, in the range 0 to 23 */
213         int tm_hour;
214         /* the day of the month, in the range 1 to 31 */
215         int tm_mday;
216         /* the number of months since January, in the range 0 to 11 */
217         int tm_mon;
218         /* the number of years since 1900 */
219         long tm_year;
220         /* the number of days since Sunday, in the range 0 to 6 */
221         int tm_wday;
222         /* the number of days since January 1, in the range 0 to 365 */
223         int tm_yday;
224 };
225 
226 void time_to_tm(time_t totalsecs, int offset, struct tm *result);
227 
228 /**
229  * timespec_to_ns - Convert timespec to nanoseconds
230  * @ts:         pointer to the timespec variable to be converted
231  *
232  * Returns the scalar nanosecond representation of the timespec
233  * parameter.
234  */
235 static inline s64 timespec_to_ns(const struct timespec *ts)
236 {
237         return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
238 }
239 
240 /**
241  * timeval_to_ns - Convert timeval to nanoseconds
242  * @ts:         pointer to the timeval variable to be converted
243  *
244  * Returns the scalar nanosecond representation of the timeval
245  * parameter.
246  */
247 static inline s64 timeval_to_ns(const struct timeval *tv)
248 {
249         return ((s64) tv->tv_sec * NSEC_PER_SEC) +
250                 tv->tv_usec * NSEC_PER_USEC;
251 }
252 
253 /**
254  * ns_to_timespec - Convert nanoseconds to timespec
255  * @nsec:       the nanoseconds value to be converted
256  *
257  * Returns the timespec representation of the nsec parameter.
258  */
259 extern struct timespec ns_to_timespec(const s64 nsec);
260 
261 /**
262  * ns_to_timeval - Convert nanoseconds to timeval
263  * @nsec:       the nanoseconds value to be converted
264  *
265  * Returns the timeval representation of the nsec parameter.
266  */
267 extern struct timeval ns_to_timeval(const s64 nsec);
268 
269 /**
270  * timespec_add_ns - Adds nanoseconds to a timespec
271  * @a:          pointer to timespec to be incremented
272  * @ns:         unsigned nanoseconds value to be added
273  *
274  * This must always be inlined because its used from the x86-64 vdso,
275  * which cannot call other kernel functions.
276  */
277 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
278 {
279         a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
280         a->tv_nsec = ns;
281 }
282 
283 /**
284  * time_between32 - check if a 32-bit timestamp is within a given time range
285  * @t:  the time which may be within [l,h]
286  * @l:  the lower bound of the range
287  * @h:  the higher bound of the range
288  *
289  * time_before32(t, l, h) returns true if @l <= @t <= @h. All operands are
290  * treated as 32-bit integers.
291  *
292  * Equivalent to !(time_before32(@t, @l) || time_after32(@t, @h)).
293  */
294 #define time_between32(t, l, h) ((u32)(h) - (u32)(l) >= (u32)(t) - (u32)(l))
295 #endif
296 

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