TIMERADD(3)

NAME
timeradd, timersub, timercmp, timerclear, timerisset - timeval operations

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);
void timerisset(struct timeval *tvp);
void timercmp(struct timeval *a, struct timeval *b, CMP);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

All functions shown above: _BSD_SOURCE

DESCRIPTION
The macros are provided to operate on timeval structures, defined in <sys/time.h> as:

struct timeval {
    time_t      tv_sec;     /* seconds */
    suseconds_t tv_usec;    /* microseconds */
};

timeradd() adds the time values in a and b, and places the sum in the timeval pointed to by res. The result is normalized such that res->tv_usec has a value in the range 0 to 999,999. timersub() subtracts the time value in b from the time value in a, and places the result in the timeval pointed to by res. The result is normalized such that res->tv_usec has a value in the range 0 to 999,999. timerclear() zeroes out the timeval structure pointed to by tvp, so that it represents the time at midnight on the morning of 1 January 1970 (the Epoch). timerisset() returns true (nonzero) if either field of the timeval structure pointed to by tvp contains a nonzero value. timercmp() compares the timer values in a and b using the comparison operator CMP, and returns true (nonzero) or false (0) depending on the result of the comparison.

RETURN VALUE
timerisset() and timercmp() return true (nonzero) or false (0).

ERRORS
No errors are defined.

CONFORMING TO
Not in POSIX.1-2001. Present on most BSD derivatives.

SEE ALSO
gettimeofday(2), time(7).

COLOPHON
This page is part of release 2.79 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.