Green shading in the line number column means the source is part of the translation unit, red means it is conditionally excluded. Highlighted line numbers link to the translation unit page. Highlighted macros link to the macro page.
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: extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 177: extern int timekeeping_valid_for_hres(void); 178: extern u64 timekeeping_max_deferment(void); 179: extern int timekeeping_inject_offset(struct timespec *ts); 180: extern s32 timekeeping_get_tai_offset(void); 181: extern void timekeeping_set_tai_offset(s32 tai_offset); 182: extern void timekeeping_clocktai(struct timespec *ts); 183: 184: struct tms; 185: extern void do_sys_times(struct tms *); 186: 187: /* 188: * Similar to the struct tm in userspace <time.h>, but it needs to be here so 189: * that the kernel source is self contained. 190: */ 191: struct tm { 192: /* 193: * the number of seconds after the minute, normally in the range 194: * 0 to 59, but can be up to 60 to allow for leap seconds 195: */ 196: int tm_sec; 197: /* the number of minutes after the hour, in the range 0 to 59*/ 198: int tm_min; 199: /* the number of hours past midnight, in the range 0 to 23 */ 200: int tm_hour; 201: /* the day of the month, in the range 1 to 31 */ 202: int tm_mday; 203: /* the number of months since January, in the range 0 to 11 */ 204: int tm_mon; 205: /* the number of years since 1900 */ 206: long tm_year; 207: /* the number of days since Sunday, in the range 0 to 6 */ 208: int tm_wday; 209: /* the number of days since January 1, in the range 0 to 365 */ 210: int tm_yday; 211: }; 212: 213: void time_to_tm(time_t totalsecs, int offset, struct tm *result); 214: 215: /** 216: * timespec_to_ns - Convert timespec to nanoseconds 217: * @ts: pointer to the timespec variable to be converted 218: * 219: * Returns the scalar nanosecond representation of the timespec 220: * parameter. 221: */ 222: static inline s64 timespec_to_ns(const struct timespec *ts) 223: { 224: return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 225: } 226: 227: /** 228: * timeval_to_ns - Convert timeval to nanoseconds 229: * @ts: pointer to the timeval variable to be converted 230: * 231: * Returns the scalar nanosecond representation of the timeval 232: * parameter. 233: */ 234: static inline s64 timeval_to_ns(const struct timeval *tv) 235: { 236: return ((s64) tv->tv_sec * NSEC_PER_SEC) + 237: tv->tv_usec * NSEC_PER_USEC; 238: } 239: 240: /** 241: * ns_to_timespec - Convert nanoseconds to timespec 242: * @nsec: the nanoseconds value to be converted 243: * 244: * Returns the timespec representation of the nsec parameter. 245: */ 246: extern struct timespec ns_to_timespec(const s64 nsec); 247: 248: /** 249: * ns_to_timeval - Convert nanoseconds to timeval 250: * @nsec: the nanoseconds value to be converted 251: * 252: * Returns the timeval representation of the nsec parameter. 253: */ 254: extern struct timeval ns_to_timeval(const s64 nsec); 255: 256: /** 257: * timespec_add_ns - Adds nanoseconds to a timespec 258: * @a: pointer to timespec to be incremented 259: * @ns: unsigned nanoseconds value to be added 260: * 261: * This must always be inlined because its used from the x86-64 vdso, 262: * which cannot call other kernel functions. 263: */ 264: static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) 265: { 266: a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 267: a->tv_nsec = ns; 268: } 269: 270: #endif 271: