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 #endif 10 11 #ifndef _STRUCT_TIMESPEC 12 #define _STRUCT_TIMESPEC 13 struct timespec { 14 time_t tv_sec; /* seconds */ 15 long tv_nsec; /* nanoseconds */ 16 }; 17 #endif 18 19 struct timeval { 20 time_t tv_sec; /* seconds */ 21 suseconds_t tv_usec; /* microseconds */ 22 }; 23 24 struct timezone { 25 int tz_minuteswest; /* minutes west of Greenwich */ 26 int tz_dsttime; /* type of dst correction */ 27 }; 28 29 #ifdef __KERNEL__ 30 31 /* Parameters used to convert the timespec values: */ 32 #define MSEC_PER_SEC 1000L 33 #define USEC_PER_MSEC 1000L 34 #define NSEC_PER_USEC 1000L 35 #define NSEC_PER_MSEC 1000000L 36 #define USEC_PER_SEC 1000000L 37 #define NSEC_PER_SEC 1000000000L 38 #define FSEC_PER_SEC 1000000000000000L 39 40 static inline int timespec_equal(const struct timespec *a, 41 const struct timespec *b) 42 { 43 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 44 } 45 46 /* 47 * lhs < rhs: return <0 48 * lhs == rhs: return 0 49 * lhs > rhs: return >0 50 */ 51 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) 52 { 53 if (lhs->tv_sec < rhs->tv_sec) 54 return -1; 55 if (lhs->tv_sec > rhs->tv_sec) 56 return 1; 57 return lhs->tv_nsec - rhs->tv_nsec; 58 } 59 60 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) 61 { 62 if (lhs->tv_sec < rhs->tv_sec) 63 return -1; 64 if (lhs->tv_sec > rhs->tv_sec) 65 return 1; 66 return lhs->tv_usec - rhs->tv_usec; 67 } 68 69 extern unsigned long mktime(const unsigned int year, const unsigned int mon, 70 const unsigned int day, const unsigned int hour, 71 const unsigned int min, const unsigned int sec); 72 73 extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec); 74 75 /* 76 * sub = lhs - rhs, in normalized form 77 */ 78 static inline struct timespec timespec_sub(struct timespec lhs, 79 struct timespec rhs) 80 { 81 struct timespec ts_delta; 82 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, 83 lhs.tv_nsec - rhs.tv_nsec); 84 return ts_delta; 85 } 86 87 /* 88 * Returns true if the timespec is norm, false if denorm: 89 */ 90 #define timespec_valid(ts) \ 91 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) 92 93 extern struct timespec xtime; 94 extern struct timespec wall_to_monotonic; 95 extern seqlock_t xtime_lock; 96 97 extern unsigned long read_persistent_clock(void); 98 extern int update_persistent_clock(struct timespec now); 99 extern int no_sync_cmos_clock __read_mostly; 100 void timekeeping_init(void); 101 102 unsigned long get_seconds(void); 103 struct timespec current_kernel_time(void); 104 105 #define CURRENT_TIME (current_kernel_time()) 106 #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) 107 108 extern void do_gettimeofday(struct timeval *tv); 109 extern int do_settimeofday(struct timespec *tv); 110 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); 111 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) 112 extern long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags); 113 struct itimerval; 114 extern int do_setitimer(int which, struct itimerval *value, 115 struct itimerval *ovalue); 116 extern unsigned int alarm_setitimer(unsigned int seconds); 117 extern int do_getitimer(int which, struct itimerval *value); 118 extern void getnstimeofday(struct timespec *tv); 119 extern void getboottime(struct timespec *ts); 120 extern void monotonic_to_bootbased(struct timespec *ts); 121 122 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 123 extern int timekeeping_valid_for_hres(void); 124 extern void update_wall_time(void); 125 extern void update_xtime_cache(u64 nsec); 126 127 /** 128 * timespec_to_ns - Convert timespec to nanoseconds 129 * @ts: pointer to the timespec variable to be converted 130 * 131 * Returns the scalar nanosecond representation of the timespec 132 * parameter. 133 */ 134 static inline s64 timespec_to_ns(const struct timespec *ts) 135 { 136 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 137 } 138 139 /** 140 * timeval_to_ns - Convert timeval to nanoseconds 141 * @ts: pointer to the timeval variable to be converted 142 * 143 * Returns the scalar nanosecond representation of the timeval 144 * parameter. 145 */ 146 static inline s64 timeval_to_ns(const struct timeval *tv) 147 { 148 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 149 tv->tv_usec * NSEC_PER_USEC; 150 } 151 152 /** 153 * ns_to_timespec - Convert nanoseconds to timespec 154 * @nsec: the nanoseconds value to be converted 155 * 156 * Returns the timespec representation of the nsec parameter. 157 */ 158 extern struct timespec ns_to_timespec(const s64 nsec); 159 160 /** 161 * ns_to_timeval - Convert nanoseconds to timeval 162 * @nsec: the nanoseconds value to be converted 163 * 164 * Returns the timeval representation of the nsec parameter. 165 */ 166 extern struct timeval ns_to_timeval(const s64 nsec); 167 168 /** 169 * timespec_add_ns - Adds nanoseconds to a timespec 170 * @a: pointer to timespec to be incremented 171 * @ns: unsigned nanoseconds value to be added 172 */ 173 static inline void timespec_add_ns(struct timespec *a, u64 ns) 174 { 175 ns += a->tv_nsec; 176 while(unlikely(ns >= NSEC_PER_SEC)) { 177 /* The following asm() prevents the compiler from 178 * optimising this loop into a modulo operation. */ 179 asm("" : "+r"(ns)); 180 181 ns -= NSEC_PER_SEC; 182 a->tv_sec++; 183 } 184 a->tv_nsec = ns; 185 } 186 #endif /* __KERNEL__ */ 187 188 #define NFDBITS __NFDBITS 189 190 #define FD_SETSIZE __FD_SETSIZE 191 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 192 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 193 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 194 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 195 196 /* 197 * Names of the interval timers, and structure 198 * defining a timer setting: 199 */ 200 #define ITIMER_REAL 0 201 #define ITIMER_VIRTUAL 1 202 #define ITIMER_PROF 2 203 204 struct itimerspec { 205 struct timespec it_interval; /* timer period */ 206 struct timespec it_value; /* timer expiration */ 207 }; 208 209 struct itimerval { 210 struct timeval it_interval; /* timer interval */ 211 struct timeval it_value; /* current value */ 212 }; 213 214 /* 215 * The IDs of the various system clocks (for POSIX.1b interval timers): 216 */ 217 #define CLOCK_REALTIME 0 218 #define CLOCK_MONOTONIC 1 219 #define CLOCK_PROCESS_CPUTIME_ID 2 220 #define CLOCK_THREAD_CPUTIME_ID 3 221 222 /* 223 * The IDs of various hardware clocks: 224 */ 225 #define CLOCK_SGI_CYCLE 10 226 #define MAX_CLOCKS 16 227 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 228 #define CLOCKS_MONO CLOCK_MONOTONIC 229 230 /* 231 * The various flags for setting POSIX.1b interval timers: 232 */ 233 #define TIMER_ABSTIME 0x01 234 235 #endif 236