1 #ifndef _LINUX_TIME_H 2 #define _LINUX_TIME_H 3 4 # include <linux/cache.h> 5 # include <linux/seqlock.h> 6 # include <linux/math64.h> 7 # include <linux/time64.h> 8 9 extern struct timezone sys_tz; 10 11 int get_timespec64(struct timespec64 *ts, 12 const struct timespec __user *uts); 13 int put_timespec64(const struct timespec64 *ts, 14 struct timespec __user *uts); 15 int get_itimerspec64(struct itimerspec64 *it, 16 const struct itimerspec __user *uit); 17 int put_itimerspec64(const struct itimerspec64 *it, 18 struct itimerspec __user *uit); 19 20 extern time64_t mktime64(const unsigned int year, const unsigned int mon, 21 const unsigned int day, const unsigned int hour, 22 const unsigned int min, const unsigned int sec); 23 24 /* Some architectures do not supply their own clocksource. 25 * This is mainly the case in architectures that get their 26 * inter-tick times by reading the counter on their interval 27 * timer. Since these timers wrap every tick, they're not really 28 * useful as clocksources. Wrapping them to act like one is possible 29 * but not very efficient. So we provide a callout these arches 30 * can implement for use with the jiffies clocksource to provide 31 * finer then tick granular time. 32 */ 33 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET 34 extern u32 (*arch_gettimeoffset)(void); 35 #endif 36 37 struct itimerval; 38 extern int do_setitimer(int which, struct itimerval *value, 39 struct itimerval *ovalue); 40 extern int do_getitimer(int which, struct itimerval *value); 41 42 extern long do_utimes(int dfd, const char __user *filename, struct timespec64 *times, int flags); 43 44 /* 45 * Similar to the struct tm in userspace <time.h>, but it needs to be here so 46 * that the kernel source is self contained. 47 */ 48 struct tm { 49 /* 50 * the number of seconds after the minute, normally in the range 51 * 0 to 59, but can be up to 60 to allow for leap seconds 52 */ 53 int tm_sec; 54 /* the number of minutes after the hour, in the range 0 to 59*/ 55 int tm_min; 56 /* the number of hours past midnight, in the range 0 to 23 */ 57 int tm_hour; 58 /* the day of the month, in the range 1 to 31 */ 59 int tm_mday; 60 /* the number of months since January, in the range 0 to 11 */ 61 int tm_mon; 62 /* the number of years since 1900 */ 63 long tm_year; 64 /* the number of days since Sunday, in the range 0 to 6 */ 65 int tm_wday; 66 /* the number of days since January 1, in the range 0 to 365 */ 67 int tm_yday; 68 }; 69 70 void time64_to_tm(time64_t totalsecs, int offset, struct tm *result); 71 72 # include <linux/time32.h> 73 74 static inline bool itimerspec64_valid(const struct itimerspec64 *its) 75 { 76 if (!timespec64_valid(&(its->it_interval)) || 77 !timespec64_valid(&(its->it_value))) 78 return false; 79 80 return true; 81 } 82 83 /** 84 * time_after32 - compare two 32-bit relative times 85 * @a: the time which may be after @b 86 * @b: the time which may be before @a 87 * 88 * time_after32(a, b) returns true if the time @a is after time @b. 89 * time_before32(b, a) returns true if the time @b is before time @a. 90 * 91 * Similar to time_after(), compare two 32-bit timestamps for relative 92 * times. This is useful for comparing 32-bit seconds values that can't 93 * be converted to 64-bit values (e.g. due to disk format or wire protocol 94 * issues) when it is known that the times are less than 68 years apart. 95 */ 96 #define time_after32(a, b) ((s32)((u32)(b) - (u32)(a)) < 0) 97 #define time_before32(b, a) time_after32(a, b) 98 #endif 99