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 seqlock_t xtime_lock; 117 118 extern void read_persistent_clock(struct timespec *ts); 119 extern void read_boot_clock(struct timespec *ts); 120 extern int update_persistent_clock(struct timespec now); 121 extern int no_sync_cmos_clock __read_mostly; 122 void timekeeping_init(void); 123 extern int timekeeping_suspended; 124 125 unsigned long get_seconds(void); 126 struct timespec current_kernel_time(void); 127 struct timespec __current_kernel_time(void); /* does not take xtime_lock */ 128 struct timespec __get_wall_to_monotonic(void); /* does not take xtime_lock */ 129 struct timespec get_monotonic_coarse(void); 130 131 #define CURRENT_TIME (current_kernel_time()) 132 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) 133 134 /* Some architectures do not supply their own clocksource. 135 * This is mainly the case in architectures that get their 136 * inter-tick times by reading the counter on their interval 137 * timer. Since these timers wrap every tick, they're not really 138 * useful as clocksources. Wrapping them to act like one is possible 139 * but not very efficient. So we provide a callout these arches 140 * can implement for use with the jiffies clocksource to provide 141 * finer then tick granular time. 142 */ 143 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET 144 extern u32 arch_gettimeoffset(void); 145 #else 146 static inline u32 arch_gettimeoffset(void) { return 0; } 147 #endif 148 149 extern void do_gettimeofday(struct timeval *tv); 150 extern int do_settimeofday(struct timespec *tv); 151 extern int do_sys_settimeofday(struct timespec *tv, 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); 165 166 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 167 extern int timekeeping_valid_for_hres(void); 168 extern u64 timekeeping_max_deferment(void); 169 extern void update_wall_time(void); 170 extern void timekeeping_leap_insert(int leapsecond); 171 172 struct tms; 173 extern void do_sys_times(struct tms *); 174 175 /* 176 * Similar to the struct tm in userspace <time.h>, but it needs to be here so 177 * that the kernel source is self contained. 178 */ 179 struct tm { 180 /* 181 * the number of seconds after the minute, normally in the range 182 * 0 to 59, but can be up to 60 to allow for leap seconds 183 */ 184 int tm_sec; 185 /* the number of minutes after the hour, in the range 0 to 59*/ 186 int tm_min; 187 /* the number of hours past midnight, in the range 0 to 23 */ 188 int tm_hour; 189 /* the day of the month, in the range 1 to 31 */ 190 int tm_mday; 191 /* the number of months since January, in the range 0 to 11 */ 192 int tm_mon; 193 /* the number of years since 1900 */ 194 long tm_year; 195 /* the number of days since Sunday, in the range 0 to 6 */ 196 int tm_wday; 197 /* the number of days since January 1, in the range 0 to 365 */ 198 int tm_yday; 199 }; 200 201 void time_to_tm(time_t totalsecs, int offset, struct tm *result); 202 203 /** 204 * timespec_to_ns - Convert timespec to nanoseconds 205 * @ts: pointer to the timespec variable to be converted 206 * 207 * Returns the scalar nanosecond representation of the timespec 208 * parameter. 209 */ 210 static inline s64 timespec_to_ns(const struct timespec *ts) 211 { 212 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 213 } 214 215 /** 216 * timeval_to_ns - Convert timeval to nanoseconds 217 * @ts: pointer to the timeval variable to be converted 218 * 219 * Returns the scalar nanosecond representation of the timeval 220 * parameter. 221 */ 222 static inline s64 timeval_to_ns(const struct timeval *tv) 223 { 224 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 225 tv->tv_usec * NSEC_PER_USEC; 226 } 227 228 /** 229 * ns_to_timespec - Convert nanoseconds to timespec 230 * @nsec: the nanoseconds value to be converted 231 * 232 * Returns the timespec representation of the nsec parameter. 233 */ 234 extern struct timespec ns_to_timespec(const s64 nsec); 235 236 /** 237 * ns_to_timeval - Convert nanoseconds to timeval 238 * @nsec: the nanoseconds value to be converted 239 * 240 * Returns the timeval representation of the nsec parameter. 241 */ 242 extern struct timeval ns_to_timeval(const s64 nsec); 243 244 /** 245 * timespec_add_ns - Adds nanoseconds to a timespec 246 * @a: pointer to timespec to be incremented 247 * @ns: unsigned nanoseconds value to be added 248 * 249 * This must always be inlined because its used from the x86-64 vdso, 250 * which cannot call other kernel functions. 251 */ 252 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) 253 { 254 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 255 a->tv_nsec = ns; 256 } 257 #endif /* __KERNEL__ */ 258 259 #define NFDBITS __NFDBITS 260 261 #define FD_SETSIZE __FD_SETSIZE 262 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 263 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 264 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 265 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 266 267 /* 268 * Names of the interval timers, and structure 269 * defining a timer setting: 270 */ 271 #define ITIMER_REAL 0 272 #define ITIMER_VIRTUAL 1 273 #define ITIMER_PROF 2 274 275 struct itimerspec { 276 struct timespec it_interval; /* timer period */ 277 struct timespec it_value; /* timer expiration */ 278 }; 279 280 struct itimerval { 281 struct timeval it_interval; /* timer interval */ 282 struct timeval it_value; /* current value */ 283 }; 284 285 /* 286 * The IDs of the various system clocks (for POSIX.1b interval timers): 287 */ 288 #define CLOCK_REALTIME 0 289 #define CLOCK_MONOTONIC 1 290 #define CLOCK_PROCESS_CPUTIME_ID 2 291 #define CLOCK_THREAD_CPUTIME_ID 3 292 #define CLOCK_MONOTONIC_RAW 4 293 #define CLOCK_REALTIME_COARSE 5 294 #define CLOCK_MONOTONIC_COARSE 6 295 296 /* 297 * The IDs of various hardware clocks: 298 */ 299 #define CLOCK_SGI_CYCLE 10 300 #define MAX_CLOCKS 16 301 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 302 #define CLOCKS_MONO CLOCK_MONOTONIC 303 304 /* 305 * The various flags for setting POSIX.1b interval timers: 306 */ 307 #define TIMER_ABSTIME 0x01 308 309 #endif 310