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  differ-
       ence 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)



                                                                        tai(3)