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(struct timespec *a, struct timespec *b) 40 { 41 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 42 } 43 44 /* 45 * lhs < rhs: return <0 46 * lhs == rhs: return 0 47 * lhs > rhs: return >0 48 */ 49 static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) 50 { 51 if (lhs->tv_sec < rhs->tv_sec) 52 return -1; 53 if (lhs->tv_sec > rhs->tv_sec) 54 return 1; 55 return lhs->tv_nsec - rhs->tv_nsec; 56 } 57 58 static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) 59 { 60 if (lhs->tv_sec < rhs->tv_sec) 61 return -1; 62 if (lhs->tv_sec > rhs->tv_sec) 63 return 1; 64 return lhs->tv_usec - rhs->tv_usec; 65 } 66 67 extern unsigned long mktime(const unsigned int year, const unsigned int mon, 68 const unsigned int day, const unsigned int hour, 69 const unsigned int min, const unsigned int sec); 70 71 extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec); 72 73 /* 74 * sub = lhs - rhs, in normalized form 75 */ 76 static inline struct timespec timespec_sub(struct timespec lhs, 77 struct timespec rhs) 78 { 79 struct timespec ts_delta; 80 set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, 81 lhs.tv_nsec - rhs.tv_nsec); 82 return ts_delta; 83 } 84 85 /* 86 * Returns true if the timespec is norm, false if denorm: 87 */ 88 #define timespec_valid(ts) \ 89 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) 90 91 extern struct timespec xtime; 92 extern struct timespec wall_to_monotonic; 93 extern seqlock_t xtime_lock __attribute__((weak)); 94 95 extern unsigned long read_persistent_clock(void); 96 void timekeeping_init(void); 97 98 static inline unsigned long get_seconds(void) 99 { 100 return xtime.tv_sec; 101 } 102 103 struct timespec current_kernel_time(void); 104 105 #define CURRENT_TIME (current_kernel_time()) 106 #define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 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); 119 120 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 121 extern int timekeeping_is_continuous(void); 122 extern void update_wall_time(void); 123 124 /** 125 * timespec_to_ns - Convert timespec to nanoseconds 126 * @ts: pointer to the timespec variable to be converted 127 * 128 * Returns the scalar nanosecond representation of the timespec 129 * parameter. 130 */ 131 static inline s64 timespec_to_ns(const struct timespec *ts) 132 { 133 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 134 } 135 136 /** 137 * timeval_to_ns - Convert timeval to nanoseconds 138 * @ts: pointer to the timeval variable to be converted 139 * 140 * Returns the scalar nanosecond representation of the timeval 141 * parameter. 142 */ 143 static inline s64 timeval_to_ns(const struct timeval *tv) 144 { 145 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 146 tv->tv_usec * NSEC_PER_USEC; 147 } 148 149 /** 150 * ns_to_timespec - Convert nanoseconds to timespec 151 * @nsec: the nanoseconds value to be converted 152 * 153 * Returns the timespec representation of the nsec parameter. 154 */ 155 extern struct timespec ns_to_timespec(const s64 nsec); 156 157 /** 158 * ns_to_timeval - Convert nanoseconds to timeval 159 * @nsec: the nanoseconds value to be converted 160 * 161 * Returns the timeval representation of the nsec parameter. 162 */ 163 extern struct timeval ns_to_timeval(const s64 nsec); 164 165 /** 166 * timespec_add_ns - Adds nanoseconds to a timespec 167 * @a: pointer to timespec to be incremented 168 * @ns: unsigned nanoseconds value to be added 169 */ 170 static inline void timespec_add_ns(struct timespec *a, u64 ns) 171 { 172 ns += a->tv_nsec; 173 while(unlikely(ns >= NSEC_PER_SEC)) { 174 ns -= NSEC_PER_SEC; 175 a->tv_sec++; 176 } 177 a->tv_nsec = ns; 178 } 179 #endif /* __KERNEL__ */ 180 181 #define NFDBITS __NFDBITS 182 183 #define FD_SETSIZE __FD_SETSIZE 184 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 185 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 186 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 187 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 188 189 /* 190 * Names of the interval timers, and structure 191 * defining a timer setting: 192 */ 193 #define ITIMER_REAL 0 194 #define ITIMER_VIRTUAL 1 195 #define ITIMER_PROF 2 196 197 struct itimerspec { 198 struct timespec it_interval; /* timer period */ 199 struct timespec it_value; /* timer expiration */ 200 }; 201 202 struct itimerval { 203 struct timeval it_interval; /* timer interval */ 204 struct timeval it_value; /* current value */ 205 }; 206 207 /* 208 * The IDs of the various system clocks (for POSIX.1b interval timers): 209 */ 210 #define CLOCK_REALTIME 0 211 #define CLOCK_MONOTONIC 1 212 #define CLOCK_PROCESS_CPUTIME_ID 2 213 #define CLOCK_THREAD_CPUTIME_ID 3 214 215 /* 216 * The IDs of various hardware clocks: 217 */ 218 #define CLOCK_SGI_CYCLE 10 219 #define MAX_CLOCKS 16 220 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 221 #define CLOCKS_MONO CLOCK_MONOTONIC 222 223 /* 224 * The various flags for setting POSIX.1b interval timers: 225 */ 226 #define TIMER_ABSTIME 0x01 227 228 #endif 229