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
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 ALSOgettimeofday(2)HISTORY
The timeradd() family of macros were imported from NetBSD 1.1, and
appeared in FreeBSD 2.2.6.
BSD August 11, 1999 BSD