#ifndef _TIME_H#define _TIME_H #include <sys/types.h>  struct tm {	int    tm_sec;	int    tm_min;	int    tm_hour;	int    tm_mday;	int    tm_mon;	int    tm_year;	int    tm_wday;	int    tm_yday;	int    tm_isdst;};  // Time conversionchar *asctime(const struct tm *);char *asctime_r(const struct tm *__restrict, char *__restrict); char *ctime(const time_t *);char *ctime_r(const time_t *, char *); // Time conversion using format stringsize_t strftime(char *__restrict s, size_t maxsize,	const char *__restrict format, const struct tm *__restrict timeptr);char *strptime(const char *__restrict buf, const char *__restrict format,	struct tm *__restrict tm); // Time arithmeticdouble difftime(time_t, time_t); // Time breakdown into struct tmstruct tm *gmtime(const time_t *);struct tm *gmtime_r(const time_t *__restrict, struct tm *__restrict);struct tm *localtime(const time_t *);struct tm *localtime_r(const time_t *__restrict, struct tm *__restrict);time_t mktime(const struct tm *); // Current wall-clock timetime_t time(time_t*); #define CLOCKS_PER_SEC 128// Current virtual CPU usage counterclock_t clock(void); #endif	// _TIME_H