aac_common
offsetof(struct aac_common, ac_sync_fib);
offsetof(struct aac_common, ac_fibs));
offsetof(struct aac_common, ac_printf));
qoff = offsetof(struct aac_common, ac_qbuf) + AAC_QUEUE_ALIGN;
sc->sc_common_seg.ds_addr + offsetof(struct aac_common, ac_init),
struct aac_common *sc_common;