+ return 0;
+
+ assert(!m->iovec);
+
+ n = 1 + m->n_body_parts;
+ if (n < ELEMENTSOF(m->iovec_fixed))
+ m->iovec = m->iovec_fixed;
+ else {
+ m->iovec = new(struct iovec, n);
+ if (!m->iovec) {
+ r = -ENOMEM;
+ goto fail;
+ }
+ }
+
+ r = append_iovec(m, m->header, BUS_MESSAGE_BODY_BEGIN(m));
+ if (r < 0)
+ goto fail;
+
+ MESSAGE_FOREACH_PART(part, i, m) {
+ r = bus_body_part_map(part);
+ if (r < 0)
+ goto fail;