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 defined 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 resulting
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
HISTORY
The timeradd() family of macros were
imported from NetBSD 1.1, and appeared in
FreeBSD 2.2.6.