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| tai(3) | FreeBSD Library Functions Manual | tai(3) |
NAME
tai - manipulate times with 1-second precisionSYNTAX
#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)
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