tai(3)

NAME
tai - manipulate times with 1-second precision

SYNTAX
#include <tai.h> double tai_approx(&t); int tai_less(&a,&b);
void tai_add(&t,&a,&b);
void tai_sub(&t,&a,&b); struct tai t;
struct tai a;
struct tai b;

DESCRIPTION
A struct tai stores an integer between 0 inclusive and 2^64 exclusive. The format of struct tai is designed to speed up common operations; applications should not look inside struct tai. A struct tai variable is commonly used to store a TAI64 label. Each TAI64 label refers to one second of real time. TAI64 labels span a period of hundreds of billions of years. See http://pobox.com/~djb/proto/tai64.txt for more information. A struct tai variable may also be used to store the numerical difference between two TAI64 labels.

ARITHMETIC
tai_approx returns a double-precision approximation to t. The result of tai_approx is always nonnegative. tai_less returns 1 if a is smaller than b, 0 otherwise. tai_add adds a and b modulo 2^64 and puts the result into t. The inputs and outputs may overlap. tai_sub subtracts b from a modulo 2^64 and puts the result into t. The inputs and outputs may overlap.

SEE ALSO
tai_now(3), tai_pack(3), taia(3), utc(3)