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_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 /* 42 * lhs < rhs: return <0 43 * lhs == rhs: return 0 44 * lhs > rhs: return >0 45 */ 46 static inline int timespec_compare(struct timespec *lhs, struct timespec *rhs) 47 { 48 if (lhs->tv_sec < rhs->tv_sec) 49 return -1; 50 if (lhs->tv_sec > rhs->tv_sec) 51 return 1; 52 return lhs->tv_nsec - rhs->tv_nsec; 53 } 54 55 static inline int timeval_compare(struct timeval *lhs, struct timeval *rhs) 56 { 57 if (lhs->tv_sec < rhs->tv_sec) 58 return -1; 59 if (lhs->tv_sec > rhs->tv_sec) 60 return 1; 61 return lhs->tv_usec - rhs->tv_usec; 62 } 63 64 extern unsigned long mktime(const unsigned int year, const unsigned int mon, 65 const unsigned int day, const unsigned int hour, 66 const unsigned int min, const unsigned int sec); 67 68 extern void set_normalized_timespec(struct timespec *ts, time_t sec, long nsec); 69 70 /* 71 * Returns true if the timespec is norm, false if denorm: 72 */ 73 #define timespec_valid(ts) \ 74 (((ts)->tv_sec >= 0) && (((unsigned long) (ts)->tv_nsec) < NSEC_PER_SEC)) 75 76 /* 77 * 64-bit nanosec type. Large enough to span 292+ years in nanosecond 78 * resolution. Ought to be enough for a while. 79 */ 80 typedef s64 nsec_t; 81 82 extern struct timespec xtime; 83 extern struct timespec wall_to_monotonic; 84 extern seqlock_t xtime_lock; 85 86 static inline unsigned long get_seconds(void) 87 { 88 return xtime.tv_sec; 89 } 90 91 struct timespec current_kernel_time(void); 92 93 #define CURRENT_TIME (current_kernel_time()) 94 #define CURRENT_TIME_SEC ((struct timespec) { xtime.tv_sec, 0 }) 95 96 extern void do_gettimeofday(struct timeval *tv); 97 extern int do_settimeofday(struct timespec *tv); 98 extern int do_sys_settimeofday(struct timespec *tv, struct timezone *tz); 99 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) 100 extern long do_utimes(int dfd, char __user *filename, struct timeval *times); 101 struct itimerval; 102 extern int do_setitimer(int which, struct itimerval *value, 103 struct itimerval *ovalue); 104 extern unsigned int alarm_setitimer(unsigned int seconds); 105 extern int do_getitimer(int which, struct itimerval *value); 106 extern void getnstimeofday(struct timespec *tv); 107 108 extern struct timespec timespec_trunc(struct timespec t, unsigned gran); 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 nsec_t timespec_to_ns(const struct timespec *ts) 118 { 119 return ((nsec_t) 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 nsec_t timeval_to_ns(const struct timeval *tv) 130 { 131 return ((nsec_t) 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 nsec_t 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 nsec_t nsec); 150 151 #endif /* __KERNEL__ */ 152 153 #define NFDBITS __NFDBITS 154 155 #define FD_SETSIZE __FD_SETSIZE 156 #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 157 #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 158 #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 159 #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 160 161 /* 162 * Names of the interval timers, and structure 163 * defining a timer setting: 164 */ 165 #define ITIMER_REAL 0 166 #define ITIMER_VIRTUAL 1 167 #define ITIMER_PROF 2 168 169 struct itimerspec { 170 struct timespec it_interval; /* timer period */ 171 struct timespec it_value; /* timer expiration */ 172 }; 173 174 struct itimerval { 175 struct timeval it_interval; /* timer interval */ 176 struct timeval it_value; /* current value */ 177 }; 178 179 /* 180 * The IDs of the various system clocks (for POSIX.1b interval timers): 181 */ 182 #define CLOCK_REALTIME 0 183 #define CLOCK_MONOTONIC 1 184 #define CLOCK_PROCESS_CPUTIME_ID 2 185 #define CLOCK_THREAD_CPUTIME_ID 3 186 187 /* 188 * The IDs of various hardware clocks: 189 */ 190 #define CLOCK_SGI_CYCLE 10 191 #define MAX_CLOCKS 16 192 #define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC) 193 #define CLOCKS_MONO CLOCK_MONOTONIC 194 195 /* 196 * The various flags for setting POSIX.1b interval timers: 197 */ 198 #define TIMER_ABSTIME 0x01 199 200 #endif 201