Also refine TCP fastopen

src/local.c

@@ -301,14 +301,11 @@ static void server_recv_cb(EV_P_ ev_io *w, int revents)
                     endpoints.sae_dstaddr = (struct sockaddr*)&(remote->addr);
                     endpoints.sae_dstaddrlen = remote->addr_len;
 
-                    struct iovec iov;
-                    iov.iov_base = remote->buf->array;
-                    iov.iov_len = remote->buf->len;
-                    size_t len;
-                    int s = connectx(remote->fd, &endpoints, SAE_ASSOCID_ANY, CONNECT_DATA_IDEMPOTENT,
-                            &iov, 1, &len, NULL);
+                    int s = connectx(remote->fd, &endpoints, SAE_ASSOCID_ANY,
+                            CONNECT_RESUME_ON_READ_WRITE | CONNECT_DATA_IDEMPOTENT,
+                            NULL, 0, NULL, NULL);
                     if (s == 0) {
-                        s = len;
+                        s = send(remote->fd, remote->buf->array, remote->buf->len, 0);
                     }
 #else
                     int s = sendto(remote->fd, remote->buf->array, remote->buf->len, MSG_FASTOPEN,

src/server.c

@@ -446,7 +446,7 @@ static remote_t *connect_to_remote(struct addrinfo *res,
             } else {
                 ERROR("sendto");
             }
-        } else if (s < server->buf->len) {
+        } else if (s <= server->buf->len) {
             server->buf->idx += s;
             server->buf->len -= s;
         } else {