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 static inline int timespec_equal(const struct timespec *a, 44 const struct timespec *b) 45 { 46 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 47 } 48 49 /* 50 * lhs < rhs: return <0 51 * lhs == rhs: return 0 52 * lhs > rhs: return >0 53 */ 54 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) 55 { 56 if (lhs->tv_sec < rhs->tv_sec) 57 return -1; 58 if (lhs->tv_sec > rhs->tv_sec) 59 return 1; 60 return lhs->tv_nsec - rhs->tv_nsec; 61 } 62 63 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) 64 { 65 if (lhs->tv_sec < rhs->tv_sec) 66 return -1; 67 if (lhs->tv_sec > rhs->tv_sec) 68 return 1; 69 return lhs->tv_usec - rhs->tv_usec; 70 } 71 72 extern unsigned long mktime(const unsigned int year, const unsigned int mon, 73 const unsigned int day, const unsigned int hour, 74 const unsigned int min, const unsigned int sec); 75 76 extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec); 77 78 /* 79 * sub = lhs - rhs, in normalized form 80 */ 81 static inline struct timespec timespec_sub(struct timespec lhs, 82 struct timespec rhs) 83 { 84 struct timespec ts_delta; 85 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, 86 lhs.tv_nsec - rhs.tv_nsec); 87 return ts_delta; 88 } 89 90 /* 91 * Returns true if the timespec is norm, false if denorm: 92 */ 93 #define timespec_valid(ts) \ 94 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) 95 96 extern struct timespec xtime; 97 extern struct timespec wall_to_monotonic; 98 extern seqlock_t xtime_lock; 99 100 extern unsigned long read_persistent_clock(void); 101 extern int update_persistent_clock(struct timespec now); 102 extern int no_sync_cmos_clock __read_mostly; 103 void timekeeping_init(void); 104 105 unsigned long get_seconds(void); 106 struct timespec current_kernel_time(void); 107 108 #define CURRENT_TIME (current_kernel_time()) 109 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) 110 111 extern void do_gettimeofday(struct timeval *tv); 112 extern int do_settimeofday(struct timespec *tv); 113 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); 114 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) 115 extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags); 116 struct itimerval; 117 extern int do_setitimer(int which, struct itimerval *value, 118 struct itimerval *ovalue); 119 extern unsigned int alarm_setitimer(unsigned int seconds); 120 extern int do_getitimer(int which, struct itimerval *value); 121 extern void getnstimeofday(struct timespec *tv); 122 extern void getboottime(struct timespec *ts); 123 extern void monotonic_to_bootbased(struct timespec *ts); 124 125 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 126 extern int timekeeping_valid_for_hres(void); 127 extern void update_wall_time(void); 128 extern void update_xtime_cache(u64 nsec); 129 130 /** 131 * timespec_to_ns - Convert timespec to nanoseconds 132 * @ts: pointer to the timespec variable to be converted 133 * 134 * Returns the scalar nanosecond representation of the timespec 135 * parameter. 136 */ 137 static inline s64 timespec_to_ns(const struct timespec *ts) 138 { 139 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 140 } 141 142 /** 143 * timeval_to_ns - Convert timeval to nanoseconds 144 * @ts: pointer to the timeval variable to be converted 145 * 146 * Returns the scalar nanosecond representation of the timeval 147 * parameter. 148 */ 149 static inline s64 timeval_to_ns(const struct timeval *tv) 150 { 151 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 152 tv->tv_usec * NSEC_PER_USEC; 153 } 154 155 /** 156 * ns_to_timespec - Convert nanoseconds to timespec 157 * @nsec: the nanoseconds value to be converted 158 * 159 * Returns the timespec representation of the nsec parameter. 160 */ 161 extern struct timespec ns_to_timespec(const s64 nsec); 162 163 /** 164 * ns_to_timeval - Convert nanoseconds to timeval 165 * @nsec: the nanoseconds value to be converted 166 * 167 * Returns the timeval representation of the nsec parameter. 168 */ 169 extern struct timeval ns_to_timeval(const s64 nsec); 170 171 /** 172 * timespec_add_ns - Adds nanoseconds to a timespec 173 * @a: pointer to timespec to be incremented 174 * @ns: unsigned nanoseconds value to be added 175 * 176 * This must always be inlined because its used from the x86-64 vdso, 177 * which cannot call other kernel functions. 178 */ 179 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) 180 { 181 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 182 a->tv_nsec = ns; 183 } 184 #endif /* __KERNEL__ */ 185 186 #define NFDBITS __NFDBITS 187 188 #define FD_SETSIZE __FD_SETSIZE 189 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 190 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 191 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 192 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 193 194 /* 195 * Names of the interval timers, and structure 196 * defining a timer setting: 197 */ 198 #define ITIMER_REAL 0 199 #define ITIMER_VIRTUAL 1 200 #define ITIMER_PROF 2 201 202 struct itimerspec { 203 struct timespec it_interval; /* timer period */ 204 struct timespec it_value; /* timer expiration */ 205 }; 206 207 struct itimerval { 208 struct timeval it_interval; /* timer interval */ 209 struct timeval it_value; /* current value */ 210 }; 211 212 /* 213 * The IDs of the various system clocks (for POSIX.1b interval timers): 214 */ 215 #define CLOCK_REALTIME 0 216 #define CLOCK_MONOTONIC 1 217 #define CLOCK_PROCESS_CPUTIME_ID 2 218 #define CLOCK_THREAD_CPUTIME_ID 3 219 220 /* 221 * The IDs of various hardware clocks: 222 */ 223 #define CLOCK_SGI_CYCLE 10 224 #define MAX_CLOCKS 16 225 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 226 #define CLOCKS_MONO CLOCK_MONOTONIC 227 228 /* 229 * The various flags for setting POSIX.1b interval timers: 230 */ 231 #define TIMER_ABSTIME 0x01 232 233 #endif 234