#ifndef _SYS_TIME_H#define _SYS_TIME_H/* gettimofday returns this */struct timeval {	long	tv_sec;		/* seconds */	long	tv_usec;	/* microseconds */};struct timezone {	int	tz_minuteswest;	/* minutes west of Greenwich */	int	tz_dsttime;	/* type of dst correction */};#define	DST_NONE	0	/* not on dst */#define	DST_USA		1	/* USA style dst */#define	DST_AUST	2	/* Australian style dst */#define	DST_WET		3	/* Western European dst */#define	DST_MET		4	/* Middle European dst */#define	DST_EET		5	/* Eastern European dst */#define	DST_CAN		6	/* Canada */#define	DST_GB		7	/* Great Britain and Eire */#define	DST_RUM		8	/* Rumania */#define	DST_TUR		9	/* Turkey */#define	DST_AUSTALT	10	/* Australian style with shift in 1986 */#define FD_SET(fd,fdsetp)	(*(fdsetp) |= (1 << (fd)))#define FD_CLR(fd,fdsetp)	(*(fdsetp) &= ~(1 << (fd)))#define FD_ISSET(fd,fdsetp)	((*(fdsetp) >> fd) & 1)#define FD_ZERO(fdsetp)		(*(fdsetp) = 0)/* * Operations on timevals. * * NB: timercmp does not work for >= or <=. */#define	timerisset(tvp)		((tvp)->tv_sec || (tvp)->tv_usec)#define	timercmp(tvp, uvp, cmp)	\	((tvp)->tv_sec cmp (uvp)->tv_sec || \	 (tvp)->tv_sec == (uvp)->tv_sec && (tvp)->tv_usec cmp (uvp)->tv_usec)#define	timerclear(tvp)		((tvp)->tv_sec = (tvp)->tv_usec = 0)/* * Names of the interval timers, and structure * defining a timer setting. */#define	ITIMER_REAL	0#define	ITIMER_VIRTUAL	1#define	ITIMER_PROF	2struct	itimerval {	struct	timeval it_interval;	/* timer interval */	struct	timeval it_value;	/* current value */};#include <time.h>#include <sys/types.h>int gettimeofday(struct timeval * tp, struct timezone * tz);int select(int width, fd_set * readfds, fd_set * writefds,	fd_set * exceptfds, struct timeval * timeout);#endif /*_SYS_TIME_H*/