1#ifndef _LINUX_TIME_H 2#define _LINUX_TIME_H 3 4#include <asm/param.h> 5#include <linux/types.h> 6 7#ifndef _STRUCT_TIMESPEC 8#define _STRUCT_TIMESPEC 9struct timespec { 10 time_t tv_sec; /* seconds */ 11 long tv_nsec; /* nanoseconds */ 12}; 13#endif /* _STRUCT_TIMESPEC */ 14 15#ifdef __KERNEL__ 16 17/* 18 * Change timeval to jiffies, trying to avoid the 19 * most obvious overflows.. 20 * 21 * And some not so obvious. 22 * 23 * Note that we don't want to return MAX_LONG, because 24 * for various timeout reasons we often end up having 25 * to wait "jiffies+1" in order to guarantee that we wait 26 * at _least_ "jiffies" - so "jiffies+1" had better still 27 * be positive. 28 */ 29#define MAX_JIFFY_OFFSET ((~0UL >> 1)-1) 30 31static __inline__ unsigned long 32timespec_to_jiffies(struct timespec *value) 33{ 34 unsigned long sec = value->tv_sec; 35 long nsec = value->tv_nsec; 36 37 if (sec >= (MAX_JIFFY_OFFSET / HZ)) 38 return MAX_JIFFY_OFFSET; 39 nsec += 1000000000L / HZ - 1; 40 nsec /= 1000000000L / HZ; 41 return HZ * sec + nsec; 42} 43 44static __inline__ void 45jiffies_to_timespec(unsigned long jiffies, struct timespec *value) 46{ 47 value->tv_nsec = (jiffies % HZ) * (1000000000L / HZ); 48 value->tv_sec = jiffies / HZ; 49} 50 51 52/* Converts Gregorian date to seconds since 1970-01-01 00:00:00. 53 * Assumes input in normal date format, i.e. 1980-12-31 23:59:59 54 * => year=1980, mon=12, day=31, hour=23, min=59, sec=59. 55 * 56 * [For the Julian calendar (which was used in Russia before 1917, 57 * Britain & colonies before 1752, anywhere else before 1582, 58 * and is still in use by some communities) leave out the 59 * -year/100+year/400 terms, and add 10.] 60 * 61 * This algorithm was first published by Gauss (I think). 62 * 63 * WARNING: this function will overflow on 2106-02-07 06:28:16 on 64 * machines were long is 32-bit! (However, as time_t is signed, we 65 * will already get problems at other places on 2038-01-19 03:14:08) 66 */ 67static inline unsigned long 68mktime (unsigned int year, unsigned int mon, 69 unsigned int day, unsigned int hour, 70 unsigned int min, unsigned int sec) 71{ 72 if (0 >= (int) (mon -= 2)) { /* 1..12 -> 11,12,1..10 */ 73 mon += 12; /* Puts Feb last since it has leap day */ 74 year -= 1; 75 } 76 77 return ((( 78 (unsigned long) (year/4 - year/100 + year/400 + 367*mon/12 + day) + 79 year*365 - 719499 80 )*24 + hour /* now have hours */ 81 )*60 + min /* now have minutes */ 82 )*60 + sec; /* finally seconds */ 83} 84 85#endif /* __KERNEL__ */ 86 87 88struct timeval { 89 time_t tv_sec; /* seconds */ 90 suseconds_t tv_usec; /* microseconds */ 91}; 92 93struct timezone { 94 int tz_minuteswest; /* minutes west of Greenwich */ 95 int tz_dsttime; /* type of dst correction */ 96}; 97 98#define NFDBITS __NFDBITS 99 100#ifdef __KERNEL__ 101extern void do_gettimeofday(struct timeval *tv); 102extern void do_settimeofday(struct timeval *tv); 103#endif 104 105#define FD_SETSIZE __FD_SETSIZE 106#define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp) 107#define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp) 108#define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp) 109#define FD_ZERO(fdsetp) __FD_ZERO(fdsetp) 110 111/* 112 * Names of the interval timers, and structure 113 * defining a timer setting. 114 */ 115#define ITIMER_REAL 0 116#define ITIMER_VIRTUAL 1 117#define ITIMER_PROF 2 118 119struct itimerspec { 120 struct timespec it_interval; /* timer period */ 121 struct timespec it_value; /* timer expiration */ 122}; 123 124struct itimerval { 125 struct timeval it_interval; /* timer interval */ 126 struct timeval it_value; /* current value */ 127}; 128 129#endif 130