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 /* Parameters used to convert the timespec values: */ 33 #define MSEC_PER_SEC 1000L 34 #define USEC_PER_MSEC 1000L 35 #define NSEC_PER_USEC 1000L 36 #define NSEC_PER_MSEC 1000000L 37 #define USEC_PER_SEC 1000000L 38 #define NSEC_PER_SEC 1000000000L 39 #define FSEC_PER_SEC 1000000000000000L 40 41 static inline int timespec_equal(const struct timespec *a, 42 const struct timespec *b) 43 { 44 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 45 } 46 47 /* 48 * lhs < rhs: return <0 49 * lhs == rhs: return 0 50 * lhs > rhs: return >0 51 */ 52 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) 53 { 54 if (lhs->tv_sec < rhs->tv_sec) 55 return -1; 56 if (lhs->tv_sec > rhs->tv_sec) 57 return 1; 58 return lhs->tv_nsec - rhs->tv_nsec; 59 } 60 61 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) 62 { 63 if (lhs->tv_sec < rhs->tv_sec) 64 return -1; 65 if (lhs->tv_sec > rhs->tv_sec) 66 return 1; 67 return lhs->tv_usec - rhs->tv_usec; 68 } 69 70 extern unsigned long mktime(const unsigned int year, const unsigned int mon, 71 const unsigned int day, const unsigned int hour, 72 const unsigned int min, const unsigned int sec); 73 74 extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec); 75 76 /* 77 * sub = lhs - rhs, in normalized form 78 */ 79 static inline struct timespec timespec_sub(struct timespec lhs, 80 struct timespec rhs) 81 { 82 struct timespec ts_delta; 83 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, 84 lhs.tv_nsec - rhs.tv_nsec); 85 return ts_delta; 86 } 87 88 /* 89 * Returns true if the timespec is norm, false if denorm: 90 */ 91 #define timespec_valid(ts) \ 92 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) 93 94 extern struct timespec xtime; 95 extern struct timespec wall_to_monotonic; 96 extern seqlock_t xtime_lock; 97 98 extern unsigned long read_persistent_clock(void); 99 extern int update_persistent_clock(struct timespec now); 100 extern int no_sync_cmos_clock __read_mostly; 101 void timekeeping_init(void); 102 103 unsigned long get_seconds(void); 104 struct timespec current_kernel_time(void); 105 106 #define CURRENT_TIME (current_kernel_time()) 107 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) 108 109 extern void do_gettimeofday(struct timeval *tv); 110 extern int do_settimeofday(struct timespec *tv); 111 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); 112 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) 113 extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags); 114 struct itimerval; 115 extern int do_setitimer(int which, struct itimerval *value, 116 struct itimerval *ovalue); 117 extern unsigned int alarm_setitimer(unsigned int seconds); 118 extern int do_getitimer(int which, struct itimerval *value); 119 extern void getnstimeofday(struct timespec *tv); 120 extern void getboottime(struct timespec *ts); 121 extern void monotonic_to_bootbased(struct timespec *ts); 122 123 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 124 extern int timekeeping_valid_for_hres(void); 125 extern void update_wall_time(void); 126 extern void update_xtime_cache(u64 nsec); 127 128 /** 129 * timespec_to_ns - Convert timespec to nanoseconds 130 * @ts: pointer to the timespec variable to be converted 131 * 132 * Returns the scalar nanosecond representation of the timespec 133 * parameter. 134 */ 135 static inline s64 timespec_to_ns(const struct timespec *ts) 136 { 137 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 138 } 139 140 /** 141 * timeval_to_ns - Convert timeval to nanoseconds 142 * @ts: pointer to the timeval variable to be converted 143 * 144 * Returns the scalar nanosecond representation of the timeval 145 * parameter. 146 */ 147 static inline s64 timeval_to_ns(const struct timeval *tv) 148 { 149 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 150 tv->tv_usec * NSEC_PER_USEC; 151 } 152 153 /** 154 * ns_to_timespec - Convert nanoseconds to timespec 155 * @nsec: the nanoseconds value to be converted 156 * 157 * Returns the timespec representation of the nsec parameter. 158 */ 159 extern struct timespec ns_to_timespec(const s64 nsec); 160 161 /** 162 * ns_to_timeval - Convert nanoseconds to timeval 163 * @nsec: the nanoseconds value to be converted 164 * 165 * Returns the timeval representation of the nsec parameter. 166 */ 167 extern struct timeval ns_to_timeval(const s64 nsec); 168 169 /** 170 * timespec_add_ns - Adds nanoseconds to a timespec 171 * @a: pointer to timespec to be incremented 172 * @ns: unsigned nanoseconds value to be added 173 * 174 * This must always be inlined because its used from the x86-64 vdso, 175 * which cannot call other kernel functions. 176 */ 177 static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) 178 { 179 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); 180 a->tv_nsec = ns; 181 } 182 #endif /* __KERNEL__ */ 183 184 #define NFDBITS __NFDBITS 185 186 #define FD_SETSIZE __FD_SETSIZE 187 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 188 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 189 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 190 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 191 192 /* 193 * Names of the interval timers, and structure 194 * defining a timer setting: 195 */ 196 #define ITIMER_REAL 0 197 #define ITIMER_VIRTUAL 1 198 #define ITIMER_PROF 2 199 200 struct itimerspec { 201 struct timespec it_interval; /* timer period */ 202 struct timespec it_value; /* timer expiration */ 203 }; 204 205 struct itimerval { 206 struct timeval it_interval; /* timer interval */ 207 struct timeval it_value; /* current value */ 208 }; 209 210 /* 211 * The IDs of the various system clocks (for POSIX.1b interval timers): 212 */ 213 #define CLOCK_REALTIME 0 214 #define CLOCK_MONOTONIC 1 215 #define CLOCK_PROCESS_CPUTIME_ID 2 216 #define CLOCK_THREAD_CPUTIME_ID 3 217 218 /* 219 * The IDs of various hardware clocks: 220 */ 221 #define CLOCK_SGI_CYCLE 10 222 #define MAX_CLOCKS 16 223 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 224 #define CLOCKS_MONO CLOCK_MONOTONIC 225 226 /* 227 * The various flags for setting POSIX.1b interval timers: 228 */ 229 #define TIMER_ABSTIME 0x01 230 231 #endif 232