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 time_to_tm(time_t totalsecs, int offset, struct tm *result); 209 210 /** 211 * timespec_to_ns - Convert timespec to nanoseconds 212 * @ts: pointer to the timespec variable to be converted 213 * 214 * Returns the scalar nanosecond representation of the timespec 215 * parameter. 216 */ 217 static inline s64 timespec_to_ns(const struct timespec *ts) 218 { 219 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 220 } 221 222 /** 223 * timeval_to_ns - Convert timeval to nanoseconds 224 * @ts: pointer to the timeval variable to be converted 225 * 226 * Returns the scalar nanosecond representation of the timeval 227 * parameter. 228 */ 229 static inline s64 timeval_to_ns(const struct timeval *tv) 230 { 231 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 232 tv->tv_usec * NSEC_PER_USEC; 233 } 234 235 /** 236 * ns_to_timespec - Convert nanoseconds to timespec 237 * @nsec: the nanoseconds value to be converted 238 * 239 * Returns the timespec representation of the nsec parameter. 240 */ 241 extern struct timespec ns_to_timespec(const s64 nsec); 242 243 /** 244 * ns_to_timeval - Convert nanoseconds to timeval 245 * @nsec: the nanoseconds value to be converted 246 * 247 * Returns the timeval representation of the nsec parameter. 248 */ 249 extern struct timeval ns_to_timeval(const s64 nsec); 250 251 /** 252 * timespec_add_ns - Adds nanoseconds to a timespec 253 * @a: pointer to timespec to be incremented 254 * @ns: unsigned nanoseconds value to be added 255 * 256 * This must always be inlined because its used from the x86-64 vdso, 257 * which cannot call other kernel functions. 258 */ 259 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) 260 { 261 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 262 a->tv_nsec = ns; 263 } 264 265 #endif 266