This section specifies behaviors that are mandatory in one of the standards on which this specification relies, but which are optional in this specification.
ISO POSIX (2003) describes the behavior of the file access
time, available as the
st_atime field of
the stat and stat64
structures. An LSB conforming implementation need not update this
information every time a file is accessed.
Note: A subsequent edition of the POSIX standard no longer mandates updating of
st_atimebut the older edition is still the guiding standard for this specification, thus this exception is needed.