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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 <linux/time64.h>
  8 
  9 extern struct timezone sys_tz;
 10 
 11 #define TIME_T_MAX      (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1)
 12 
 13 static inline int timespec_equal(const struct timespec *a,
 14                                  const struct timespec *b)
 15 {
 16         return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
 17 }
 18 
 19 /*
 20  * lhs < rhs:  return <0
 21  * lhs == rhs: return 0
 22  * lhs > rhs:  return >0
 23  */
 24 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs)
 25 {
 26         if (lhs->tv_sec < rhs->tv_sec)
 27                 return -1;
 28         if (lhs->tv_sec > rhs->tv_sec)
 29                 return 1;
 30         return lhs->tv_nsec - rhs->tv_nsec;
 31 }
 32 
 33 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *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_usec - rhs->tv_usec;
 40 }
 41 
 42 extern time64_t mktime64(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);
 45 
 46 /**
 47  * Deprecated. Use mktime64().
 48  */
 49 static inline unsigned long mktime(const unsigned int year,
 50                         const unsigned int mon, const unsigned int day,
 51                         const unsigned int hour, const unsigned int min,
 52                         const unsigned int sec)
 53 {
 54         return mktime64(year, mon, day, hour, min, sec);
 55 }
 56 
 57 extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
 58 
 59 /*
 60  * timespec_add_safe assumes both values are positive and checks
 61  * for overflow. It will return TIME_T_MAX if the reutrn would be
 62  * smaller then either of the arguments.
 63  */
 64 extern struct timespec timespec_add_safe(const struct timespec lhs,
 65                                          const struct timespec rhs);
 66 
 67 
 68 static inline struct timespec timespec_add(struct timespec lhs,
 69                                                 struct timespec rhs)
 70 {
 71         struct timespec ts_delta;
 72         set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec,
 73                                 lhs.tv_nsec + rhs.tv_nsec);
 74         return ts_delta;
 75 }
 76 
 77 /*
 78  * sub = lhs - rhs, in normalized form
 79  */
 80 static inline struct timespec timespec_sub(struct timespec lhs,
 81                                                 struct timespec rhs)
 82 {
 83         struct timespec ts_delta;
 84         set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec,
 85                                 lhs.tv_nsec - rhs.tv_nsec);
 86         return ts_delta;
 87 }
 88 
 89 /*
 90  * Returns true if the timespec is norm, false if denorm:
 91  */
 92 static inline bool timespec_valid(const struct timespec *ts)
 93 {
 94         /* Dates before 1970 are bogus */
 95         if (ts->tv_sec < 0)
 96                 return false;
 97         /* Can't have more nanoseconds then a second */
 98         if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
 99                 return false;
100         return true;
101 }
102 
103 static inline bool timespec_valid_strict(const struct timespec *ts)
104 {
105         if (!timespec_valid(ts))
106                 return false;
107         /* Disallow values that could overflow ktime_t */
108         if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
109                 return false;
110         return true;
111 }
112 
113 static inline bool timeval_valid(const struct timeval *tv)
114 {
115         /* Dates before 1970 are bogus */
116         if (tv->tv_sec < 0)
117                 return false;
118 
119         /* Can't have more microseconds then a second */
120         if (tv->tv_usec < 0 || tv->tv_usec >= USEC_PER_SEC)
121                 return false;
122 
123         return true;
124 }
125 
126 extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
127 
128 /*
129  * Validates if a timespec/timeval used to inject a time offset is valid.
130  * Offsets can be postive or negative. The value of the timeval/timespec
131  * is the sum of its fields, but *NOTE*: the field tv_usec/tv_nsec must
132  * always be non-negative.
133  */
134 static inline bool timeval_inject_offset_valid(const struct timeval *tv)
135 {
136         /* We don't check the tv_sec as it can be positive or negative */
137 
138         /* Can't have more microseconds then a second */
139         if (tv->tv_usec < 0 || tv->tv_usec >= USEC_PER_SEC)
140                 return false;
141         return true;
142 }
143 
144 static inline bool timespec_inject_offset_valid(const struct timespec *ts)
145 {
146         /* We don't check the tv_sec as it can be positive or negative */
147 
148         /* Can't have more nanoseconds then a second */
149         if (ts->tv_nsec < 0 || ts->tv_nsec >= NSEC_PER_SEC)
150                 return false;
151         return true;
152 }
153 
154 #define CURRENT_TIME            (current_kernel_time())
155 #define CURRENT_TIME_SEC        ((struct timespec) { get_seconds(), 0 })
156 
157 /* Some architectures do not supply their own clocksource.
158  * This is mainly the case in architectures that get their
159  * inter-tick times by reading the counter on their interval
160  * timer. Since these timers wrap every tick, they're not really
161  * useful as clocksources. Wrapping them to act like one is possible
162  * but not very efficient. So we provide a callout these arches
163  * can implement for use with the jiffies clocksource to provide
164  * finer then tick granular time.
165  */
166 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
167 extern u32 (*arch_gettimeoffset)(void);
168 #endif
169 
170 struct itimerval;
171 extern int do_setitimer(int which, struct itimerval *value,
172                         struct itimerval *ovalue);
173 extern int do_getitimer(int which, struct itimerval *value);
174 
175 extern unsigned int alarm_setitimer(unsigned int seconds);
176 
177 extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags);
178 
179 struct tms;
180 extern void do_sys_times(struct tms *);
181 
182 /*
183  * Similar to the struct tm in userspace <time.h>, but it needs to be here so
184  * that the kernel source is self contained.
185  */
186 struct tm {
187         /*
188          * the number of seconds after the minute, normally in the range
189          * 0 to 59, but can be up to 60 to allow for leap seconds
190          */
191         int tm_sec;
192         /* the number of minutes after the hour, in the range 0 to 59*/
193         int tm_min;
194         /* the number of hours past midnight, in the range 0 to 23 */
195         int tm_hour;
196         /* the day of the month, in the range 1 to 31 */
197         int tm_mday;
198         /* the number of months since January, in the range 0 to 11 */
199         int tm_mon;
200         /* the number of years since 1900 */
201         long tm_year;
202         /* the number of days since Sunday, in the range 0 to 6 */
203         int tm_wday;
204         /* the number of days since January 1, in the range 0 to 365 */
205         int tm_yday;
206 };
207 
208 void time64_to_tm(time64_t totalsecs, int offset, struct tm *result);
209 
210 /**
211  * time_to_tm - converts the calendar time to local broken-down time
212  *
213  * @totalsecs   the number of seconds elapsed since 00:00:00 on January 1, 1970,
214  *              Coordinated Universal Time (UTC).
215  * @offset      offset seconds adding to totalsecs.
216  * @result      pointer to struct tm variable to receive broken-down time
217  */
218 static inline void time_to_tm(time_t totalsecs, int offset, struct tm *result)
219 {
220         time64_to_tm(totalsecs, offset, result);
221 }
222 
223 /**
224  * timespec_to_ns - Convert timespec to nanoseconds
225  * @ts:         pointer to the timespec variable to be converted
226  *
227  * Returns the scalar nanosecond representation of the timespec
228  * parameter.
229  */
230 static inline s64 timespec_to_ns(const struct timespec *ts)
231 {
232         return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
233 }
234 
235 /**
236  * timeval_to_ns - Convert timeval to nanoseconds
237  * @ts:         pointer to the timeval variable to be converted
238  *
239  * Returns the scalar nanosecond representation of the timeval
240  * parameter.
241  */
242 static inline s64 timeval_to_ns(const struct timeval *tv)
243 {
244         return ((s64) tv->tv_sec * NSEC_PER_SEC) +
245                 tv->tv_usec * NSEC_PER_USEC;
246 }
247 
248 /**
249  * ns_to_timespec - Convert nanoseconds to timespec
250  * @nsec:       the nanoseconds value to be converted
251  *
252  * Returns the timespec representation of the nsec parameter.
253  */
254 extern struct timespec ns_to_timespec(const s64 nsec);
255 
256 /**
257  * ns_to_timeval - Convert nanoseconds to timeval
258  * @nsec:       the nanoseconds value to be converted
259  *
260  * Returns the timeval representation of the nsec parameter.
261  */
262 extern struct timeval ns_to_timeval(const s64 nsec);
263 
264 /**
265  * timespec_add_ns - Adds nanoseconds to a timespec
266  * @a:          pointer to timespec to be incremented
267  * @ns:         unsigned nanoseconds value to be added
268  *
269  * This must always be inlined because its used from the x86-64 vdso,
270  * which cannot call other kernel functions.
271  */
272 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
273 {
274         a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
275         a->tv_nsec = ns;
276 }
277 
278 #endif
279 

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