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 int get_timespec64(struct timespec64 *ts, 12 const struct timespec __user *uts); 13 int put_timespec64(const struct timespec64 *ts, 14 struct timespec __user *uts); 15 int get_itimerspec64(struct itimerspec64 *it, 16 const struct itimerspec __user *uit); 17 int put_itimerspec64(const struct itimerspec64 *it, 18 struct itimerspec __user *uit); 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 time64_t mktime64(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 /** 56 * Deprecated. Use mktime64(). 57 */ 58 static inline unsigned long mktime(const unsigned int year, 59 const unsigned int mon, const unsigned int day, 60 const unsigned int hour, const unsigned int min, 61 const unsigned int sec) 62 { 63 return mktime64(year, mon, day, hour, min, sec); 64 } 65 66 extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec); 67 68 /* 69 * timespec_add_safe assumes both values are positive and checks 70 * for overflow. It will return TIME_T_MAX if the reutrn would be 71 * smaller then either of the arguments. 72 */ 73 extern struct timespec timespec_add_safe(const struct timespec lhs, 74 const struct timespec rhs); 75 76 77 static inline struct timespec timespec_add(struct timespec lhs, 78 struct timespec rhs) 79 { 80 struct timespec ts_delta; 81 set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec, 82 lhs.tv_nsec + rhs.tv_nsec); 83 return ts_delta; 84 } 85 86 /* 87 * sub = lhs - rhs, in normalized form 88 */ 89 static inline struct timespec timespec_sub(struct timespec lhs, 90 struct timespec rhs) 91 { 92 struct timespec ts_delta; 93 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, 94 lhs.tv_nsec - rhs.tv_nsec); 95 return ts_delta; 96 } 97 98 /* 99 * Returns true if the timespec is norm, false if denorm: 100 */ 101 static inline bool timespec_valid(const struct timespec *ts) 102 { 103 /* Dates before 1970 are bogus */ 104 if (ts->tv_sec < 0) 105 return false; 106 /* Can't have more nanoseconds then a second */ 107 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) 108 return false; 109 return true; 110 } 111 112 static inline bool timespec_valid_strict(const struct timespec *ts) 113 { 114 if (!timespec_valid(ts)) 115 return false; 116 /* Disallow values that could overflow ktime_t */ 117 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) 118 return false; 119 return true; 120 } 121 122 static inline bool timeval_valid(const struct timeval *tv) 123 { 124 /* Dates before 1970 are bogus */ 125 if (tv->tv_sec < 0) 126 return false; 127 128 /* Can't have more microseconds then a second */ 129 if (tv->tv_usec < 0 || tv->tv_usec >= USEC_PER_SEC) 130 return false; 131 132 return true; 133 } 134 135 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 136 137 /* 138 * Validates if a timespec/timeval used to inject a time offset is valid. 139 * Offsets can be postive or negative. The value of the timeval/timespec 140 * is the sum of its fields, but *NOTE*: the field tv_usec/tv_nsec must 141 * always be non-negative. 142 */ 143 static inline bool timeval_inject_offset_valid(const struct timeval *tv) 144 { 145 /* We don't check the tv_sec as it can be positive or negative */ 146 147 /* Can't have more microseconds then a second */ 148 if (tv->tv_usec < 0 || tv->tv_usec >= USEC_PER_SEC) 149 return false; 150 return true; 151 } 152 153 static inline bool timespec_inject_offset_valid(const struct timespec *ts) 154 { 155 /* We don't check the tv_sec as it can be positive or negative */ 156 157 /* Can't have more nanoseconds then a second */ 158 if (ts->tv_nsec < 0 || ts->tv_nsec >= NSEC_PER_SEC) 159 return false; 160 return true; 161 } 162 163 /* Some architectures do not supply their own clocksource. 164 * This is mainly the case in architectures that get their 165 * inter-tick times by reading the counter on their interval 166 * timer. Since these timers wrap every tick, they're not really 167 * useful as clocksources. Wrapping them to act like one is possible 168 * but not very efficient. So we provide a callout these arches 169 * can implement for use with the jiffies clocksource to provide 170 * finer then tick granular time. 171 */ 172 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET 173 extern u32 (*arch_gettimeoffset)(void); 174 #endif 175 176 struct itimerval; 177 extern int do_setitimer(int which, struct itimerval *value, 178 struct itimerval *ovalue); 179 extern int do_getitimer(int which, struct itimerval *value); 180 181 extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags); 182 183 struct tms; 184 extern void do_sys_times(struct tms *); 185 186 /* 187 * Similar to the struct tm in userspace <time.h>, but it needs to be here so 188 * that the kernel source is self contained. 189 */ 190 struct tm { 191 /* 192 * the number of seconds after the minute, normally in the range 193 * 0 to 59, but can be up to 60 to allow for leap seconds 194 */ 195 int tm_sec; 196 /* the number of minutes after the hour, in the range 0 to 59*/ 197 int tm_min; 198 /* the number of hours past midnight, in the range 0 to 23 */ 199 int tm_hour; 200 /* the day of the month, in the range 1 to 31 */ 201 int tm_mday; 202 /* the number of months since January, in the range 0 to 11 */ 203 int tm_mon; 204 /* the number of years since 1900 */ 205 long tm_year; 206 /* the number of days since Sunday, in the range 0 to 6 */ 207 int tm_wday; 208 /* the number of days since January 1, in the range 0 to 365 */ 209 int tm_yday; 210 }; 211 212 void time64_to_tm(time64_t totalsecs, int offset, struct tm *result); 213 214 /** 215 * time_to_tm - converts the calendar time to local broken-down time 216 * 217 * @totalsecs the number of seconds elapsed since 00:00:00 on January 1, 1970, 218 * Coordinated Universal Time (UTC). 219 * @offset offset seconds adding to totalsecs. 220 * @result pointer to struct tm variable to receive broken-down time 221 */ 222 static inline void time_to_tm(time_t totalsecs, int offset, struct tm *result) 223 { 224 time64_to_tm(totalsecs, offset, result); 225 } 226 227 /** 228 * timespec_to_ns - Convert timespec to nanoseconds 229 * @ts: pointer to the timespec variable to be converted 230 * 231 * Returns the scalar nanosecond representation of the timespec 232 * parameter. 233 */ 234 static inline s64 timespec_to_ns(const struct timespec *ts) 235 { 236 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 237 } 238 239 /** 240 * timeval_to_ns - Convert timeval to nanoseconds 241 * @ts: pointer to the timeval variable to be converted 242 * 243 * Returns the scalar nanosecond representation of the timeval 244 * parameter. 245 */ 246 static inline s64 timeval_to_ns(const struct timeval *tv) 247 { 248 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 249 tv->tv_usec * NSEC_PER_USEC; 250 } 251 252 /** 253 * ns_to_timespec - Convert nanoseconds to timespec 254 * @nsec: the nanoseconds value to be converted 255 * 256 * Returns the timespec representation of the nsec parameter. 257 */ 258 extern struct timespec ns_to_timespec(const s64 nsec); 259 260 /** 261 * ns_to_timeval - Convert nanoseconds to timeval 262 * @nsec: the nanoseconds value to be converted 263 * 264 * Returns the timeval representation of the nsec parameter. 265 */ 266 extern struct timeval ns_to_timeval(const s64 nsec); 267 268 /** 269 * timespec_add_ns - Adds nanoseconds to a timespec 270 * @a: pointer to timespec to be incremented 271 * @ns: unsigned nanoseconds value to be added 272 * 273 * This must always be inlined because its used from the x86-64 vdso, 274 * which cannot call other kernel functions. 275 */ 276 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) 277 { 278 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 279 a->tv_nsec = ns; 280 } 281 282 static inline bool itimerspec64_valid(const struct itimerspec64 *its) 283 { 284 if (!timespec64_valid(&(its->it_interval)) || 285 !timespec64_valid(&(its->it_value))) 286 return false; 287 288 return true; 289 } 290 291 #endif 292