xs_talkv
return xs_talkv(t, type, &iovec, 1, len);
ret = xs_error(xs_talkv(t, XS_WRITE, iovec, ARRAY_SIZE(iovec), NULL));
return xs_error(xs_talkv(XBT_NIL, XS_WATCH, iov,
return xs_error(xs_talkv(XBT_NIL, XS_UNWATCH, iov,