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 timeval *times); 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); 122 123 /** 124 * timespec_to_ns - Convert timespec to nanoseconds 125 * @ts: pointer to the timespec variable to be converted 126 * 127 * Returns the scalar nanosecond representation of the timespec 128 * parameter. 129 */ 130 static inline s64 timespec_to_ns(const struct timespec *ts) 131 { 132 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 133 } 134 135 /** 136 * timeval_to_ns - Convert timeval to nanoseconds 137 * @ts: pointer to the timeval variable to be converted 138 * 139 * Returns the scalar nanosecond representation of the timeval 140 * parameter. 141 */ 142 static inline s64 timeval_to_ns(const struct timeval *tv) 143 { 144 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 145 tv->tv_usec * NSEC_PER_USEC; 146 } 147 148 /** 149 * ns_to_timespec - Convert nanoseconds to timespec 150 * @nsec: the nanoseconds value to be converted 151 * 152 * Returns the timespec representation of the nsec parameter. 153 */ 154 extern struct timespec ns_to_timespec(const s64 nsec); 155 156 /** 157 * ns_to_timeval - Convert nanoseconds to timeval 158 * @nsec: the nanoseconds value to be converted 159 * 160 * Returns the timeval representation of the nsec parameter. 161 */ 162 extern struct timeval ns_to_timeval(const s64 nsec); 163 164 /** 165 * timespec_add_ns - Adds nanoseconds to a timespec 166 * @a: pointer to timespec to be incremented 167 * @ns: unsigned nanoseconds value to be added 168 */ 169 static inline void timespec_add_ns(struct timespec *a, u64 ns) 170 { 171 ns += a->tv_nsec; 172 while(unlikely(ns >= NSEC_PER_SEC)) { 173 ns -= NSEC_PER_SEC; 174 a->tv_sec++; 175 } 176 a->tv_nsec = ns; 177 } 178 #endif /* __KERNEL__ */ 179 180 #define NFDBITS __NFDBITS 181 182 #define FD_SETSIZE __FD_SETSIZE 183 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 184 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 185 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 186 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 187 188 /* 189 * Names of the interval timers, and structure 190 * defining a timer setting: 191 */ 192 #define ITIMER_REAL 0 193 #define ITIMER_VIRTUAL 1 194 #define ITIMER_PROF 2 195 196 struct itimerspec { 197 struct timespec it_interval; /* timer period */ 198 struct timespec it_value; /* timer expiration */ 199 }; 200 201 struct itimerval { 202 struct timeval it_interval; /* timer interval */ 203 struct timeval it_value; /* current value */ 204 }; 205 206 /* 207 * The IDs of the various system clocks (for POSIX.1b interval timers): 208 */ 209 #define CLOCK_REALTIME 0 210 #define CLOCK_MONOTONIC 1 211 #define CLOCK_PROCESS_CPUTIME_ID 2 212 #define CLOCK_THREAD_CPUTIME_ID 3 213 214 /* 215 * The IDs of various hardware clocks: 216 */ 217 #define CLOCK_SGI_CYCLE 10 218 #define MAX_CLOCKS 16 219 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 220 #define CLOCKS_MONO CLOCK_MONOTONIC 221 222 /* 223 * The various flags for setting POSIX.1b interval timers: 224 */ 225 #define TIMER_ABSTIME 0x01 226 227 #endif 228