1 #ifndef _LINUX_TIME_H 2 #define _LINUX_TIME_H 3 4 #include <linux/types.h> 5 6 #ifdef __KERNEL__ 7 # include <linux/seqlock.h> 8 #endif 9 10 #ifndef _STRUCT_TIMESPEC 11 #define _STRUCT_TIMESPEC 12 struct timespec { 13 time_t tv_sec; /* seconds */ 14 long tv_nsec; /* nanoseconds */ 15 }; 16 #endif 17 18 struct timeval { 19 time_t tv_sec; /* seconds */ 20 suseconds_t tv_usec; /* microseconds */ 21 }; 22 23 struct timezone { 24 int tz_minuteswest; /* minutes west of Greenwich */ 25 int tz_dsttime; /* type of dst correction */ 26 }; 27 28 #ifdef __KERNEL__ 29 30 /* Parameters used to convert the timespec values: */ 31 #define MSEC_PER_SEC 1000L 32 #define USEC_PER_MSEC 1000L 33 #define NSEC_PER_USEC 1000L 34 #define NSEC_PER_MSEC 1000000L 35 #define USEC_PER_SEC 1000000L 36 #define NSEC_PER_SEC 1000000000L 37 #define FSEC_PER_SEC 1000000000000000L 38 39 static inline int timespec_equal(const struct timespec *a, 40 const struct timespec *b) 41 { 42 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 43 } 44 45 /* 46 * lhs < rhs: return <0 47 * lhs == rhs: return 0 48 * lhs > rhs: return >0 49 */ 50 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) 51 { 52 if (lhs->tv_sec < rhs->tv_sec) 53 return -1; 54 if (lhs->tv_sec > rhs->tv_sec) 55 return 1; 56 return lhs->tv_nsec - rhs->tv_nsec; 57 } 58 59 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) 60 { 61 if (lhs->tv_sec < rhs->tv_sec) 62 return -1; 63 if (lhs->tv_sec > rhs->tv_sec) 64 return 1; 65 return lhs->tv_usec - rhs->tv_usec; 66 } 67 68 extern unsigned long mktime(const unsigned int year, const unsigned int mon, 69 const unsigned int day, const unsigned int hour, 70 const unsigned int min, const unsigned int sec); 71 72 extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec); 73 74 /* 75 * sub = lhs - rhs, in normalized form 76 */ 77 static inline struct timespec timespec_sub(struct timespec lhs, 78 struct timespec rhs) 79 { 80 struct timespec ts_delta; 81 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, 82 lhs.tv_nsec - rhs.tv_nsec); 83 return ts_delta; 84 } 85 86 /* 87 * Returns true if the timespec is norm, false if denorm: 88 */ 89 #define timespec_valid(ts) \ 90 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) 91 92 extern struct timespec xtime; 93 extern struct timespec wall_to_monotonic; 94 extern seqlock_t xtime_lock __attribute__((weak)); 95 96 extern unsigned long read_persistent_clock(void); 97 void timekeeping_init(void); 98 99 static inline unsigned long get_seconds(void) 100 { 101 return xtime.tv_sec; 102 } 103 104 struct timespec current_kernel_time(void); 105 106 #define CURRENT_TIME (current_kernel_time()) 107 #define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 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_is_continuous(void); 125 extern void update_wall_time(void); 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 ns -= NSEC_PER_SEC; 178 a->tv_sec++; 179 } 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