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 time_t tv_sec; /* seconds */ 16 long tv_nsec; /* nanoseconds */ 17 }; 18 #endif 19 20 struct timeval { 21 time_t tv_sec; /* seconds */ 22 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); 108 109 unsigned long get_seconds(void); 110 struct timespec current_kernel_time(void); 111 112 #define CURRENT_TIME (current_kernel_time()) 113 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) 114 115 extern void do_gettimeofday(struct timeval *tv); 116 extern int do_settimeofday(struct timespec *tv); 117 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); 118 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) 119 extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags); 120 struct itimerval; 121 extern int do_setitimer(int which, struct itimerval *value, 122 struct itimerval *ovalue); 123 extern unsigned int alarm_setitimer(unsigned int seconds); 124 extern int do_getitimer(int which, struct itimerval *value); 125 extern void getnstimeofday(struct timespec *tv); 126 extern void getrawmonotonic(struct timespec *ts); 127 extern void getboottime(struct timespec *ts); 128 extern void monotonic_to_bootbased(struct timespec *ts); 129 130 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 131 extern int timekeeping_valid_for_hres(void); 132 extern void update_wall_time(void); 133 extern void update_xtime_cache(u64 nsec); 134 135 struct tms; 136 extern void do_sys_times(struct tms *); 137 138 /** 139 * timespec_to_ns - Convert timespec to nanoseconds 140 * @ts: pointer to the timespec variable to be converted 141 * 142 * Returns the scalar nanosecond representation of the timespec 143 * parameter. 144 */ 145 static inline s64 timespec_to_ns(const struct timespec *ts) 146 { 147 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 148 } 149 150 /** 151 * timeval_to_ns - Convert timeval to nanoseconds 152 * @ts: pointer to the timeval variable to be converted 153 * 154 * Returns the scalar nanosecond representation of the timeval 155 * parameter. 156 */ 157 static inline s64 timeval_to_ns(const struct timeval *tv) 158 { 159 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 160 tv->tv_usec * NSEC_PER_USEC; 161 } 162 163 /** 164 * ns_to_timespec - Convert nanoseconds to timespec 165 * @nsec: the nanoseconds value to be converted 166 * 167 * Returns the timespec representation of the nsec parameter. 168 */ 169 extern struct timespec ns_to_timespec(const s64 nsec); 170 171 /** 172 * ns_to_timeval - Convert nanoseconds to timeval 173 * @nsec: the nanoseconds value to be converted 174 * 175 * Returns the timeval representation of the nsec parameter. 176 */ 177 extern struct timeval ns_to_timeval(const s64 nsec); 178 179 /** 180 * timespec_add_ns - Adds nanoseconds to a timespec 181 * @a: pointer to timespec to be incremented 182 * @ns: unsigned nanoseconds value to be added 183 * 184 * This must always be inlined because its used from the x86-64 vdso, 185 * which cannot call other kernel functions. 186 */ 187 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) 188 { 189 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 190 a->tv_nsec = ns; 191 } 192 #endif /* __KERNEL__ */ 193 194 #define NFDBITS __NFDBITS 195 196 #define FD_SETSIZE __FD_SETSIZE 197 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 198 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 199 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 200 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 201 202 /* 203 * Names of the interval timers, and structure 204 * defining a timer setting: 205 */ 206 #define ITIMER_REAL 0 207 #define ITIMER_VIRTUAL 1 208 #define ITIMER_PROF 2 209 210 struct itimerspec { 211 struct timespec it_interval; /* timer period */ 212 struct timespec it_value; /* timer expiration */ 213 }; 214 215 struct itimerval { 216 struct timeval it_interval; /* timer interval */ 217 struct timeval it_value; /* current value */ 218 }; 219 220 /* 221 * The IDs of the various system clocks (for POSIX.1b interval timers): 222 */ 223 #define CLOCK_REALTIME 0 224 #define CLOCK_MONOTONIC 1 225 #define CLOCK_PROCESS_CPUTIME_ID 2 226 #define CLOCK_THREAD_CPUTIME_ID 3 227 #define CLOCK_MONOTONIC_RAW 4 228 229 /* 230 * The IDs of various hardware clocks: 231 */ 232 #define CLOCK_SGI_CYCLE 10 233 #define MAX_CLOCKS 16 234 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 235 #define CLOCKS_MONO CLOCK_MONOTONIC 236 237 /* 238 * The various flags for setting POSIX.1b interval timers: 239 */ 240 #define TIMER_ABSTIME 0x01 241 242 #endif 243