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 * Returns true if the timespec is norm, false if denorm: 75 */ 76 #define timespec_valid(ts) \ 77 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) 78 79 extern struct timespec xtime; 80 extern struct timespec wall_to_monotonic; 81 extern seqlock_t xtime_lock; 82 83 void timekeeping_init(void); 84 85 static inline unsigned long get_seconds(void) 86 { 87 return xtime.tv_sec; 88 } 89 90 struct timespec current_kernel_time(void); 91 92 #define CURRENT_TIME (current_kernel_time()) 93 #define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 }) 94 95 extern void do_gettimeofday(struct timeval *tv); 96 extern int do_settimeofday(struct timespec *tv); 97 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); 98 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) 99 extern long do_utimes(int dfd, char __user *filename, struct timeval *times); 100 struct itimerval; 101 extern int do_setitimer(int which, struct itimerval *value, 102 struct itimerval *ovalue); 103 extern unsigned int alarm_setitimer(unsigned int seconds); 104 extern int do_getitimer(int which, struct itimerval *value); 105 extern void getnstimeofday(struct timespec *tv); 106 107 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 108 extern int timekeeping_is_continuous(void); 109 110 /** 111 * timespec_to_ns - Convert timespec to nanoseconds 112 * @ts: pointer to the timespec variable to be converted 113 * 114 * Returns the scalar nanosecond representation of the timespec 115 * parameter. 116 */ 117 static inline s64 timespec_to_ns(const struct timespec *ts) 118 { 119 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; 120 } 121 122 /** 123 * timeval_to_ns - Convert timeval to nanoseconds 124 * @ts: pointer to the timeval variable to be converted 125 * 126 * Returns the scalar nanosecond representation of the timeval 127 * parameter. 128 */ 129 static inline s64 timeval_to_ns(const struct timeval *tv) 130 { 131 return ((s64) tv->tv_sec * NSEC_PER_SEC) + 132 tv->tv_usec * NSEC_PER_USEC; 133 } 134 135 /** 136 * ns_to_timespec - Convert nanoseconds to timespec 137 * @nsec: the nanoseconds value to be converted 138 * 139 * Returns the timespec representation of the nsec parameter. 140 */ 141 extern struct timespec ns_to_timespec(const s64 nsec); 142 143 /** 144 * ns_to_timeval - Convert nanoseconds to timeval 145 * @nsec: the nanoseconds value to be converted 146 * 147 * Returns the timeval representation of the nsec parameter. 148 */ 149 extern struct timeval ns_to_timeval(const s64 nsec); 150 151 /** 152 * timespec_add_ns - Adds nanoseconds to a timespec 153 * @a: pointer to timespec to be incremented 154 * @ns: unsigned nanoseconds value to be added 155 */ 156 static inline void timespec_add_ns(struct timespec *a, u64 ns) 157 { 158 ns += a->tv_nsec; 159 while(unlikely(ns >= NSEC_PER_SEC)) { 160 ns -= NSEC_PER_SEC; 161 a->tv_sec++; 162 } 163 a->tv_nsec = ns; 164 } 165 #endif /* __KERNEL__ */ 166 167 #define NFDBITS __NFDBITS 168 169 #define FD_SETSIZE __FD_SETSIZE 170 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 171 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 172 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 173 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 174 175 /* 176 * Names of the interval timers, and structure 177 * defining a timer setting: 178 */ 179 #define ITIMER_REAL 0 180 #define ITIMER_VIRTUAL 1 181 #define ITIMER_PROF 2 182 183 struct itimerspec { 184 struct timespec it_interval; /* timer period */ 185 struct timespec it_value; /* timer expiration */ 186 }; 187 188 struct itimerval { 189 struct timeval it_interval; /* timer interval */ 190 struct timeval it_value; /* current value */ 191 }; 192 193 /* 194 * The IDs of the various system clocks (for POSIX.1b interval timers): 195 */ 196 #define CLOCK_REALTIME 0 197 #define CLOCK_MONOTONIC 1 198 #define CLOCK_PROCESS_CPUTIME_ID 2 199 #define CLOCK_THREAD_CPUTIME_ID 3 200 201 /* 202 * The IDs of various hardware clocks: 203 */ 204 #define CLOCK_SGI_CYCLE 10 205 #define MAX_CLOCKS 16 206 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 207 #define CLOCKS_MONO CLOCK_MONOTONIC 208 209 /* 210 * The various flags for setting POSIX.1b interval timers: 211 */ 212 #define TIMER_ABSTIME 0x01 213 214 #endif 215