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 /* _STRUCT_TIMESPEC */ 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_SEC (1000000L) 33 #define NSEC_PER_SEC (1000000000L) 34 #define NSEC_PER_USEC (1000L) 35 36 static __inline__ int timespec_equal(struct timespec *a, struct timespec *b) 37 { 38 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); 39 } 40 41 /* Converts Gregorian date to seconds since 1970-01-01 00:00:00. 42 * Assumes input in normal date format, i.e. 1980-12-31 23:59:59 43 * => year=1980, mon=12, day=31, hour=23, min=59, sec=59. 44 * 45 * [For the Julian calendar (which was used in Russia before 1917, 46 * Britain & colonies before 1752, anywhere else before 1582, 47 * and is still in use by some communities) leave out the 48 * -year/100+year/400 terms, and add 10.] 49 * 50 * This algorithm was first published by Gauss (I think). 51 * 52 * WARNING: this function will overflow on 2106-02-07 06:28:16 on 53 * machines were long is 32-bit! (However, as time_t is signed, we 54 * will already get problems at other places on 2038-01-19 03:14:08) 55 */ 56 static inline unsigned long 57 mktime (unsigned int year, unsigned int mon, 58 unsigned int day, unsigned int hour, 59 unsigned int min, unsigned int sec) 60 { 61 if (0 >= (int) (mon -= 2)) { /* 1..12 -> 11,12,1..10 */ 62 mon += 12; /* Puts Feb last since it has leap day */ 63 year -= 1; 64 } 65 66 return ((( 67 (unsigned long) (year/4 - year/100 + year/400 + 367*mon/12 + day) + 68 year*365 - 719499 69 )*24 + hour /* now have hours */ 70 )*60 + min /* now have minutes */ 71 )*60 + sec; /* finally seconds */ 72 } 73 74 extern struct timespec xtime; 75 extern struct timespec wall_to_monotonic; 76 extern seqlock_t xtime_lock; 77 78 static inline unsigned long get_seconds(void) 79 { 80 return xtime.tv_sec; 81 } 82 83 struct timespec current_kernel_time(void); 84 85 #define CURRENT_TIME (current_kernel_time()) 86 #define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 }) 87 88 extern void do_gettimeofday(struct timeval *tv); 89 extern int do_settimeofday(struct timespec *tv); 90 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); 91 extern void clock_was_set(void); // call when ever the clock is set 92 extern int do_posix_clock_monotonic_gettime(struct timespec *tp); 93 extern long do_utimes(char __user * filename, struct timeval * times); 94 struct itimerval; 95 extern int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue); 96 extern int do_getitimer(int which, struct itimerval *value); 97 extern void getnstimeofday (struct timespec *tv); 98 99 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 100 101 static inline void 102 set_normalized_timespec (struct timespec *ts, time_t sec, long nsec) 103 { 104 while (nsec > NSEC_PER_SEC) { 105 nsec -= NSEC_PER_SEC; 106 ++sec; 107 } 108 while (nsec < 0) { 109 nsec += NSEC_PER_SEC; 110 --sec; 111 } 112 ts->tv_sec = sec; 113 ts->tv_nsec = nsec; 114 } 115 116 #endif /* __KERNEL__ */ 117 118 #define NFDBITS __NFDBITS 119 120 #define FD_SETSIZE __FD_SETSIZE 121 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 122 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 123 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 124 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 125 126 /* 127 * Names of the interval timers, and structure 128 * defining a timer setting. 129 */ 130 #define ITIMER_REAL 0 131 #define ITIMER_VIRTUAL 1 132 #define ITIMER_PROF 2 133 134 struct itimerspec { 135 struct timespec it_interval; /* timer period */ 136 struct timespec it_value; /* timer expiration */ 137 }; 138 139 struct itimerval { 140 struct timeval it_interval; /* timer interval */ 141 struct timeval it_value; /* current value */ 142 }; 143 144 145 /* 146 * The IDs of the various system clocks (for POSIX.1b interval timers). 147 */ 148 #define CLOCK_REALTIME 0 149 #define CLOCK_MONOTONIC 1 150 #define CLOCK_PROCESS_CPUTIME_ID 2 151 #define CLOCK_THREAD_CPUTIME_ID 3 152 #define CLOCK_REALTIME_HR 4 153 #define CLOCK_MONOTONIC_HR 5 154 155 /* 156 * The IDs of various hardware clocks 157 */ 158 159 160 #define CLOCK_SGI_CYCLE 10 161 #define MAX_CLOCKS 16 162 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC | \ 163 CLOCK_REALTIME_HR | CLOCK_MONOTONIC_HR) 164 #define CLOCKS_MONO (CLOCK_MONOTONIC & CLOCK_MONOTONIC_HR) 165 166 /* 167 * The various flags for setting POSIX.1b interval timers. 168 */ 169 170 #define TIMER_ABSTIME 0x01 171 172 173 #endif 174