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TIMERADD(3)		 BSD Library Functions Manual		   TIMERADD(3)

NAME
     timeradd, timersub, timerclear, timerisset, timercmp -- operations	on
     timevals

SYNOPSIS
     #include <sys/time.h>

     void
     timeradd(struct timeval *a, struct	timeval	*b, struct timeval *res);

     void
     timersub(struct timeval *a, struct	timeval	*b, struct timeval *res);

     void
     timerclear(struct timeval *tvp);

     int
     timerisset(struct timeval *tvp);

     int
     timercmp(struct timeval *a, struct	timeval	*b, CMP);

DESCRIPTION
     These macros are provided for manipulating	timeval	structures for use
     with the gettimeofday(2) and settimeofday(2) calls.  The structure	is de-
     fined in <sys/time.h> as:

     struct timeval {
	     long    tv_sec;	     /*	seconds	since Jan. 1, 1970 */
	     long    tv_usec;	     /*	and microseconds */
     };

     timeradd()	adds the time information stored in a to b and stores the re-
     sulting timeval in	res.  The results are simplified such that the value
     of	res-_tv_usec is	always less than 1,000,000 (1 second).

     timersub()	subtracts the time information stored in b from	a and stores
     the resulting timeval in res.

     timerclear() initializes tvp to midnight (0 hour) January 1st, 1970 (the
     Epoch).

     timerisset() returns true if tvp is set to	any time value other than the
     Epoch.

     timercmp()	compares a to b	using the comparison operator given in CMP,
     and returns the result of that comparison.

SEE ALSO
     gettimeofday(2)

HISTORY
     The timeradd() family of macros were imported from	NetBSD 1.1, and	ap-
     peared in FreeBSD 2.2.6.

BSD				August 11, 1999				   BSD
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY

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