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 1000000000000000L 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, long nsec); 79 extern struct timespec timespec_add_safe(const struct timespec lhs, 80 const struct timespec rhs); 81 82 /* 83 * sub = lhs - rhs, in normalized form 84 */ 85 static inline struct timespec timespec_sub(struct timespec lhs, 86 struct timespec rhs) 87 { 88 struct timespec ts_delta; 89 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, 90 lhs.tv_nsec - rhs.tv_nsec); 91 return ts_delta; 92 } 93 94 /* 95 * Returns true if the timespec is norm, false if denorm: 96 */ 97 #define timespec_valid(ts) \ 98 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) 99 100 extern struct timespec xtime; 101 extern struct timespec wall_to_monotonic; 102 extern seqlock_t xtime_lock; 103 104 extern unsigned long read_persistent_clock(void); 105 extern int update_persistent_clock(struct timespec now); 106 extern int no_sync_cmos_clock __read_mostly; 107 void timekeeping_init(void); 108 extern int timekeeping_suspended; 109 110 unsigned long get_seconds(void); 111 struct timespec current_kernel_time(void); 112 113 #define CURRENT_TIME (current_kernel_time()) 114 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) 115 116 /* Some architectures do not supply their own clocksource. 117 * This is mainly the case in architectures that get their 118 * inter-tick times by reading the counter on their interval 119 * timer. Since these timers wrap every tick, they're not really 120 * useful as clocksources. Wrapping them to act like one is possible 121 * but not very efficient. So we provide a callout these arches 122 * can implement for use with the jiffies clocksource to provide 123 * finer then tick granular time. 124 */ 125 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET 126 extern u32 arch_gettimeoffset(void); 127 #else 128 static inline u32 arch_gettimeoffset(void) { return 0; } 129 #endif 130 131 extern void do_gettimeofday(struct timeval *tv); 132 extern int do_settimeofday(struct timespec *tv); 133 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); 134 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) 135 extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags); 136 struct itimerval; 137 extern int do_setitimer(int which, struct itimerval *value, 138 struct itimerval *ovalue); 139 extern unsigned int alarm_setitimer(unsigned int seconds); 140 extern int do_getitimer(int which, struct itimerval *value); 141 extern void getnstimeofday(struct timespec *tv); 142 extern void getrawmonotonic(struct timespec *ts); 143 extern void getboottime(struct timespec *ts); 144 extern void monotonic_to_bootbased(struct timespec *ts); 145 146 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 147 extern int timekeeping_valid_for_hres(void); 148 extern void update_wall_time(void); 149 extern void update_xtime_cache(u64 nsec); 150 151 struct tms; 152 extern void do_sys_times(struct tms *); 153 154 /** 155 * timespec_to_ns - Convert timespec to nanoseconds 156 * @ts: pointer to the timespec variable to be converted 157 * 158 * Returns the scalar nanosecond representation of the timespec 159 * parameter. 160 */ 161 static inline s64 timespec_to_ns(const struct timespec *ts) 162 { 163 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 164 } 165 166 /** 167 * timeval_to_ns - Convert timeval to nanoseconds 168 * @ts: pointer to the timeval variable to be converted 169 * 170 * Returns the scalar nanosecond representation of the timeval 171 * parameter. 172 */ 173 static inline s64 timeval_to_ns(const struct timeval *tv) 174 { 175 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 176 tv->tv_usec * NSEC_PER_USEC; 177 } 178 179 /** 180 * ns_to_timespec - Convert nanoseconds to timespec 181 * @nsec: the nanoseconds value to be converted 182 * 183 * Returns the timespec representation of the nsec parameter. 184 */ 185 extern struct timespec ns_to_timespec(const s64 nsec); 186 187 /** 188 * ns_to_timeval - Convert nanoseconds to timeval 189 * @nsec: the nanoseconds value to be converted 190 * 191 * Returns the timeval representation of the nsec parameter. 192 */ 193 extern struct timeval ns_to_timeval(const s64 nsec); 194 195 /** 196 * timespec_add_ns - Adds nanoseconds to a timespec 197 * @a: pointer to timespec to be incremented 198 * @ns: unsigned nanoseconds value to be added 199 * 200 * This must always be inlined because its used from the x86-64 vdso, 201 * which cannot call other kernel functions. 202 */ 203 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) 204 { 205 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 206 a->tv_nsec = ns; 207 } 208 #endif /* __KERNEL__ */ 209 210 #define NFDBITS __NFDBITS 211 212 #define FD_SETSIZE __FD_SETSIZE 213 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 214 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 215 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 216 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 217 218 /* 219 * Names of the interval timers, and structure 220 * defining a timer setting: 221 */ 222 #define ITIMER_REAL 0 223 #define ITIMER_VIRTUAL 1 224 #define ITIMER_PROF 2 225 226 struct itimerspec { 227 struct timespec it_interval; /* timer period */ 228 struct timespec it_value; /* timer expiration */ 229 }; 230 231 struct itimerval { 232 struct timeval it_interval; /* timer interval */ 233 struct timeval it_value; /* current value */ 234 }; 235 236 /* 237 * The IDs of the various system clocks (for POSIX.1b interval timers): 238 */ 239 #define CLOCK_REALTIME 0 240 #define CLOCK_MONOTONIC 1 241 #define CLOCK_PROCESS_CPUTIME_ID 2 242 #define CLOCK_THREAD_CPUTIME_ID 3 243 #define CLOCK_MONOTONIC_RAW 4 244 245 /* 246 * The IDs of various hardware clocks: 247 */ 248 #define CLOCK_SGI_CYCLE 10 249 #define MAX_CLOCKS 16 250 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 251 #define CLOCKS_MONO CLOCK_MONOTONIC 252 253 /* 254 * The various flags for setting POSIX.1b interval timers: 255 */ 256 #define TIMER_ABSTIME 0x01 257 258 #endif 259