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 #define CURRENT_TIME (current_kernel_time()) 129 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) 130 131 /* Some architectures do not supply their own clocksource. 132 * This is mainly the case in architectures that get their 133 * inter-tick times by reading the counter on their interval 134 * timer. Since these timers wrap every tick, they're not really 135 * useful as clocksources. Wrapping them to act like one is possible 136 * but not very efficient. So we provide a callout these arches 137 * can implement for use with the jiffies clocksource to provide 138 * finer then tick granular time. 139 */ 140 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET 141 extern u32 (*arch_gettimeoffset)(void); 142 #endif 143 144 struct itimerval; 145 extern int do_setitimer(int which, struct itimerval *value, 146 struct itimerval *ovalue); 147 extern int do_getitimer(int which, struct itimerval *value); 148 149 extern unsigned int alarm_setitimer(unsigned int seconds); 150 151 extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags); 152 153 struct tms; 154 extern void do_sys_times(struct tms *); 155 156 /* 157 * Similar to the struct tm in userspace <time.h>, but it needs to be here so 158 * that the kernel source is self contained. 159 */ 160 struct tm { 161 /* 162 * the number of seconds after the minute, normally in the range 163 * 0 to 59, but can be up to 60 to allow for leap seconds 164 */ 165 int tm_sec; 166 /* the number of minutes after the hour, in the range 0 to 59*/ 167 int tm_min; 168 /* the number of hours past midnight, in the range 0 to 23 */ 169 int tm_hour; 170 /* the day of the month, in the range 1 to 31 */ 171 int tm_mday; 172 /* the number of months since January, in the range 0 to 11 */ 173 int tm_mon; 174 /* the number of years since 1900 */ 175 long tm_year; 176 /* the number of days since Sunday, in the range 0 to 6 */ 177 int tm_wday; 178 /* the number of days since January 1, in the range 0 to 365 */ 179 int tm_yday; 180 }; 181 182 void time_to_tm(time_t totalsecs, int offset, struct tm *result); 183 184 /** 185 * timespec_to_ns - Convert timespec to nanoseconds 186 * @ts: pointer to the timespec variable to be converted 187 * 188 * Returns the scalar nanosecond representation of the timespec 189 * parameter. 190 */ 191 static inline s64 timespec_to_ns(const struct timespec *ts) 192 { 193 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 194 } 195 196 /** 197 * timeval_to_ns - Convert timeval to nanoseconds 198 * @ts: pointer to the timeval variable to be converted 199 * 200 * Returns the scalar nanosecond representation of the timeval 201 * parameter. 202 */ 203 static inline s64 timeval_to_ns(const struct timeval *tv) 204 { 205 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 206 tv->tv_usec * NSEC_PER_USEC; 207 } 208 209 /** 210 * ns_to_timespec - Convert nanoseconds to timespec 211 * @nsec: the nanoseconds value to be converted 212 * 213 * Returns the timespec representation of the nsec parameter. 214 */ 215 extern struct timespec ns_to_timespec(const s64 nsec); 216 217 /** 218 * ns_to_timeval - Convert nanoseconds to timeval 219 * @nsec: the nanoseconds value to be converted 220 * 221 * Returns the timeval representation of the nsec parameter. 222 */ 223 extern struct timeval ns_to_timeval(const s64 nsec); 224 225 /** 226 * timespec_add_ns - Adds nanoseconds to a timespec 227 * @a: pointer to timespec to be incremented 228 * @ns: unsigned nanoseconds value to be added 229 * 230 * This must always be inlined because its used from the x86-64 vdso, 231 * which cannot call other kernel functions. 232 */ 233 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) 234 { 235 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 236 a->tv_nsec = ns; 237 } 238 239 #endif 240