1 #ifndef _LINUX_TIME_H 2 #define _LINUX_TIME_H 3 4 #include <linux/types.h> 5 6 #ifdef __KERNEL__ 7 # include <linux/cache.h> 8 # include <linux/seqlock.h> 9 # include <linux/math64.h> 10 #endif 11 12 #ifndef _STRUCT_TIMESPEC 13 #define _STRUCT_TIMESPEC 14 struct timespec { 15 __kernel_time_t tv_sec; /* seconds */ 16 long tv_nsec; /* nanoseconds */ 17 }; 18 #endif 19 20 struct timeval { 21 __kernel_time_t tv_sec; /* seconds */ 22 __kernel_suseconds_t tv_usec; /* microseconds */ 23 }; 24 25 struct timezone { 26 int tz_minuteswest; /* minutes west of Greenwich */ 27 int tz_dsttime; /* type of dst correction */ 28 }; 29 30 #ifdef __KERNEL__ 31 32 extern struct timezone sys_tz; 33 34 /* Parameters used to convert the timespec values: */ 35 #define MSEC_PER_SEC 1000L 36 #define USEC_PER_MSEC 1000L 37 #define NSEC_PER_USEC 1000L 38 #define NSEC_PER_MSEC 1000000L 39 #define USEC_PER_SEC 1000000L 40 #define NSEC_PER_SEC 1000000000L 41 #define FSEC_PER_SEC 1000000000000000LL 42 43 #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) 44 45 static inline int timespec_equal(const struct timespec *a, 46 const struct timespec *b) 47 { 48 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 49 } 50 51 /* 52 * lhs < rhs: return <0 53 * lhs == rhs: return 0 54 * lhs > rhs: return >0 55 */ 56 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) 57 { 58 if (lhs->tv_sec < rhs->tv_sec) 59 return -1; 60 if (lhs->tv_sec > rhs->tv_sec) 61 return 1; 62 return lhs->tv_nsec - rhs->tv_nsec; 63 } 64 65 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) 66 { 67 if (lhs->tv_sec < rhs->tv_sec) 68 return -1; 69 if (lhs->tv_sec > rhs->tv_sec) 70 return 1; 71 return lhs->tv_usec - rhs->tv_usec; 72 } 73 74 extern unsigned long mktime(const unsigned int year, const unsigned int mon, 75 const unsigned int day, const unsigned int hour, 76 const unsigned int min, const unsigned int sec); 77 78 extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec); 79 80 /* 81 * timespec_add_safe assumes both values are positive and checks 82 * for overflow. It will return TIME_T_MAX if the reutrn would be 83 * smaller then either of the arguments. 84 */ 85 extern struct timespec timespec_add_safe(const struct timespec lhs, 86 const struct timespec rhs); 87 88 89 static inline struct timespec timespec_add(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 * sub = lhs - rhs, in normalized form 100 */ 101 static inline struct timespec timespec_sub(struct timespec lhs, 102 struct timespec rhs) 103 { 104 struct timespec ts_delta; 105 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, 106 lhs.tv_nsec - rhs.tv_nsec); 107 return ts_delta; 108 } 109 110 /* 111 * Returns true if the timespec is norm, false if denorm: 112 */ 113 #define timespec_valid(ts) \ 114 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) 115 116 extern void read_persistent_clock(struct timespec *ts); 117 extern void read_boot_clock(struct timespec *ts); 118 extern int update_persistent_clock(struct timespec now); 119 extern int no_sync_cmos_clock __read_mostly; 120 void timekeeping_init(void); 121 extern int timekeeping_suspended; 122 123 unsigned long get_seconds(void); 124 struct timespec current_kernel_time(void); 125 struct timespec __current_kernel_time(void); /* does not take xtime_lock */ 126 struct timespec get_monotonic_coarse(void); 127 void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, 128 struct timespec *wtom, struct timespec *sleep); 129 130 #define CURRENT_TIME (current_kernel_time()) 131 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) 132 133 /* Some architectures do not supply their own clocksource. 134 * This is mainly the case in architectures that get their 135 * inter-tick times by reading the counter on their interval 136 * timer. Since these timers wrap every tick, they're not really 137 * useful as clocksources. Wrapping them to act like one is possible 138 * but not very efficient. So we provide a callout these arches 139 * can implement for use with the jiffies clocksource to provide 140 * finer then tick granular time. 141 */ 142 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET 143 extern u32 arch_gettimeoffset(void); 144 #else 145 static inline u32 arch_gettimeoffset(void) { return 0; } 146 #endif 147 148 extern void do_gettimeofday(struct timeval *tv); 149 extern int do_settimeofday(const struct timespec *tv); 150 extern int do_sys_settimeofday(const struct timespec *tv, 151 const struct timezone *tz); 152 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) 153 extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags); 154 struct itimerval; 155 extern int do_setitimer(int which, struct itimerval *value, 156 struct itimerval *ovalue); 157 extern unsigned int alarm_setitimer(unsigned int seconds); 158 extern int do_getitimer(int which, struct itimerval *value); 159 extern void getnstimeofday(struct timespec *tv); 160 extern void getrawmonotonic(struct timespec *ts); 161 extern void getnstime_raw_and_real(struct timespec *ts_raw, 162 struct timespec *ts_real); 163 extern void getboottime(struct timespec *ts); 164 extern void monotonic_to_bootbased(struct timespec *ts); 165 extern void get_monotonic_boottime(struct timespec *ts); 166 167 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 168 extern int timekeeping_valid_for_hres(void); 169 extern u64 timekeeping_max_deferment(void); 170 extern void timekeeping_leap_insert(int leapsecond); 171 extern int timekeeping_inject_offset(struct timespec *ts); 172 173 struct tms; 174 extern void do_sys_times(struct tms *); 175 176 /* 177 * Similar to the struct tm in userspace <time.h>, but it needs to be here so 178 * that the kernel source is self contained. 179 */ 180 struct tm { 181 /* 182 * the number of seconds after the minute, normally in the range 183 * 0 to 59, but can be up to 60 to allow for leap seconds 184 */ 185 int tm_sec; 186 /* the number of minutes after the hour, in the range 0 to 59*/ 187 int tm_min; 188 /* the number of hours past midnight, in the range 0 to 23 */ 189 int tm_hour; 190 /* the day of the month, in the range 1 to 31 */ 191 int tm_mday; 192 /* the number of months since January, in the range 0 to 11 */ 193 int tm_mon; 194 /* the number of years since 1900 */ 195 long tm_year; 196 /* the number of days since Sunday, in the range 0 to 6 */ 197 int tm_wday; 198 /* the number of days since January 1, in the range 0 to 365 */ 199 int tm_yday; 200 }; 201 202 void time_to_tm(time_t totalsecs, int offset, struct tm *result); 203 204 /** 205 * timespec_to_ns - Convert timespec to nanoseconds 206 * @ts: pointer to the timespec variable to be converted 207 * 208 * Returns the scalar nanosecond representation of the timespec 209 * parameter. 210 */ 211 static inline s64 timespec_to_ns(const struct timespec *ts) 212 { 213 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 214 } 215 216 /** 217 * timeval_to_ns - Convert timeval to nanoseconds 218 * @ts: pointer to the timeval variable to be converted 219 * 220 * Returns the scalar nanosecond representation of the timeval 221 * parameter. 222 */ 223 static inline s64 timeval_to_ns(const struct timeval *tv) 224 { 225 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 226 tv->tv_usec * NSEC_PER_USEC; 227 } 228 229 /** 230 * ns_to_timespec - Convert nanoseconds to timespec 231 * @nsec: the nanoseconds value to be converted 232 * 233 * Returns the timespec representation of the nsec parameter. 234 */ 235 extern struct timespec ns_to_timespec(const s64 nsec); 236 237 /** 238 * ns_to_timeval - Convert nanoseconds to timeval 239 * @nsec: the nanoseconds value to be converted 240 * 241 * Returns the timeval representation of the nsec parameter. 242 */ 243 extern struct timeval ns_to_timeval(const s64 nsec); 244 245 /** 246 * timespec_add_ns - Adds nanoseconds to a timespec 247 * @a: pointer to timespec to be incremented 248 * @ns: unsigned nanoseconds value to be added 249 * 250 * This must always be inlined because its used from the x86-64 vdso, 251 * which cannot call other kernel functions. 252 */ 253 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) 254 { 255 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 256 a->tv_nsec = ns; 257 } 258 #endif /* __KERNEL__ */ 259 260 #define NFDBITS __NFDBITS 261 262 #define FD_SETSIZE __FD_SETSIZE 263 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 264 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 265 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 266 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 267 268 /* 269 * Names of the interval timers, and structure 270 * defining a timer setting: 271 */ 272 #define ITIMER_REAL 0 273 #define ITIMER_VIRTUAL 1 274 #define ITIMER_PROF 2 275 276 struct itimerspec { 277 struct timespec it_interval; /* timer period */ 278 struct timespec it_value; /* timer expiration */ 279 }; 280 281 struct itimerval { 282 struct timeval it_interval; /* timer interval */ 283 struct timeval it_value; /* current value */ 284 }; 285 286 /* 287 * The IDs of the various system clocks (for POSIX.1b interval timers): 288 */ 289 #define CLOCK_REALTIME 0 290 #define CLOCK_MONOTONIC 1 291 #define CLOCK_PROCESS_CPUTIME_ID 2 292 #define CLOCK_THREAD_CPUTIME_ID 3 293 #define CLOCK_MONOTONIC_RAW 4 294 #define CLOCK_REALTIME_COARSE 5 295 #define CLOCK_MONOTONIC_COARSE 6 296 #define CLOCK_BOOTTIME 7 297 298 /* 299 * The IDs of various hardware clocks: 300 */ 301 #define CLOCK_SGI_CYCLE 10 302 #define MAX_CLOCKS 16 303 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 304 #define CLOCKS_MONO CLOCK_MONOTONIC 305 306 /* 307 * The various flags for setting POSIX.1b interval timers: 308 */ 309 #define TIMER_ABSTIME 0x01 310 311 #endif 312