getsize
error = getsize(xc, fileid, &size);
.getsize = z3rambd_altmem_getsize,
sc->sc_size = sc->sc_memops->getsize(sc->sc_cookie);
size_t (*getsize)(void *);
static const char *const getsize[EMULATIONS] =
IGNORE_RC(write(tty, getsize[emu], strlen(getsize[emu])));
va->va_size = getsize(sfs, &pn->pn_po);