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