struct evbuffer_iovec vec;
if (evbuffer_reserve_space(evb, SWIFT_MAX_RECV_DGRAM_SIZE, &vec, 1) < 0) {
print_error("error on evbuffer_reserve_space");
struct evbuffer_iovec vec;
if (evbuffer_reserve_space(evb, SWIFT_MAX_RECV_DGRAM_SIZE, &vec, 1) < 0) {
print_error("error on evbuffer_reserve_space");