AO_EBADOPTION
AO_EFAIL
AO_EFILEEXISTS
AO_ENODRIVER
AO_ENOTFILE
AO_ENOTLIVE
AO_EOPENDEVICE
AO_EOPENFILE
AO_FMT_BIG
AO_FMT_LITTLE
AO_FMT_NATIVE
AO_TYPE_FILE
AO_TYPE_LIVE
LibaoPath