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(struct timespec *lhs, 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(struct timeval *lhs, 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; 94 95 void timekeeping_init(void); 96 97 static inline unsigned long get_seconds(void) 98 { 99 return xtime.tv_sec; 100 } 101 102 struct timespec current_kernel_time(void); 103 104 #define CURRENT_TIME (current_kernel_time()) 105 #define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 }) 106 107 extern void do_gettimeofday(struct timeval *tv); 108 extern int do_settimeofday(struct timespec *tv); 109 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); 110 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) 111 extern long do_utimes(int dfd, char __user *filename, struct timeval *times); 112 struct itimerval; 113 extern int do_setitimer(int which, struct itimerval *value, 114 struct itimerval *ovalue); 115 extern unsigned int alarm_setitimer(unsigned int seconds); 116 extern int do_getitimer(int which, struct itimerval *value); 117 extern void getnstimeofday(struct timespec *tv); 118 119 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 120 extern int timekeeping_is_continuous(void); 121 122 /** 123 * timespec_to_ns - Convert timespec to nanoseconds 124 * @ts: pointer to the timespec variable to be converted 125 * 126 * Returns the scalar nanosecond representation of the timespec 127 * parameter. 128 */ 129 static inline s64 timespec_to_ns(const struct timespec *ts) 130 { 131 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 132 } 133 134 /** 135 * timeval_to_ns - Convert timeval to nanoseconds 136 * @ts: pointer to the timeval variable to be converted 137 * 138 * Returns the scalar nanosecond representation of the timeval 139 * parameter. 140 */ 141 static inline s64 timeval_to_ns(const struct timeval *tv) 142 { 143 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 144 tv->tv_usec * NSEC_PER_USEC; 145 } 146 147 /** 148 * ns_to_timespec - Convert nanoseconds to timespec 149 * @nsec: the nanoseconds value to be converted 150 * 151 * Returns the timespec representation of the nsec parameter. 152 */ 153 extern struct timespec ns_to_timespec(const s64 nsec); 154 155 /** 156 * ns_to_timeval - Convert nanoseconds to timeval 157 * @nsec: the nanoseconds value to be converted 158 * 159 * Returns the timeval representation of the nsec parameter. 160 */ 161 extern struct timeval ns_to_timeval(const s64 nsec); 162 163 /** 164 * timespec_add_ns - Adds nanoseconds to a timespec 165 * @a: pointer to timespec to be incremented 166 * @ns: unsigned nanoseconds value to be added 167 */ 168 static inline void timespec_add_ns(struct timespec *a, u64 ns) 169 { 170 ns += a->tv_nsec; 171 while(unlikely(ns >= NSEC_PER_SEC)) { 172 ns -= NSEC_PER_SEC; 173 a->tv_sec++; 174 } 175 a->tv_nsec = ns; 176 } 177 #endif /* __KERNEL__ */ 178 179 #define NFDBITS __NFDBITS 180 181 #define FD_SETSIZE __FD_SETSIZE 182 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 183 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 184 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 185 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 186 187 /* 188 * Names of the interval timers, and structure 189 * defining a timer setting: 190 */ 191 #define ITIMER_REAL 0 192 #define ITIMER_VIRTUAL 1 193 #define ITIMER_PROF 2 194 195 struct itimerspec { 196 struct timespec it_interval; /* timer period */ 197 struct timespec it_value; /* timer expiration */ 198 }; 199 200 struct itimerval { 201 struct timeval it_interval; /* timer interval */ 202 struct timeval it_value; /* current value */ 203 }; 204 205 /* 206 * The IDs of the various system clocks (for POSIX.1b interval timers): 207 */ 208 #define CLOCK_REALTIME 0 209 #define CLOCK_MONOTONIC 1 210 #define CLOCK_PROCESS_CPUTIME_ID 2 211 #define CLOCK_THREAD_CPUTIME_ID 3 212 213 /* 214 * The IDs of various hardware clocks: 215 */ 216 #define CLOCK_SGI_CYCLE 10 217 #define MAX_CLOCKS 16 218 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 219 #define CLOCKS_MONO CLOCK_MONOTONIC 220 221 /* 222 * The various flags for setting POSIX.1b interval timers: 223 */ 224 #define TIMER_ABSTIME 0x01 225 226 #endif 227
