+static void recv_call(ClientData sock_cd, int mask) {
+ DgramSocket *sock= (void*)sock_cd;
+ Tcl_Interp *ip= sock->script.ip;
+ int sz, rc, peek;
+ HBytes_Value message_val;
+ SockAddr_Value peer_val;
+ Tcl_Obj *args[3];
+ struct msghdr mh;
+ struct iovec iov;
+
+ hbytes_empty(&message_val);
+ sockaddr_clear(&peer_val);
+
+ mh.msg_iov= &iov;
+ mh.msg_iovlen= 1;
+ mh.msg_control= 0;
+ mh.msg_controllen= 0;
+ mh.msg_flags= 0;
+
+ peek= MSG_PEEK;
+
+ for (;;) {
+ mh.msg_name= sock->addr_buf;
+ mh.msg_namelen= sock->addr_buflen;
+
+ iov.iov_base= sock->msg_buf;
+ iov.iov_len= sock->msg_buflen;
+
+ sz= recvmsg(sock->fd, &mh, peek);
+ if (sz==-1) {
+ if (errno == EAGAIN || errno == EWOULDBLOCK) rc=0;
+ else rc= posixerr(ip,errno,"recvmsg");
+ goto x_rc;
+ }
+
+ assert(mh.msg_namelen < sock->addr_buflen);
+
+ if (!(mh.msg_flags & MSG_TRUNC)) {
+ if (!peek) break;
+ peek= 0;
+ continue;
+ }
+
+ TFREE(sock->msg_buf);
+ sock->msg_buflen *= 2;
+ sock->msg_buflen += 100;
+ sock->msg_buf= TALLOC(sock->msg_buflen);
+ }
+
+ hbytes_array(&message_val, iov.iov_base, sz);
+ sockaddr_create(&peer_val, mh.msg_name, mh.msg_namelen);
+
+ args[0]= ret_hb(ip, message_val); hbytes_empty(&message_val);
+ args[1]= ret_sockaddr(ip, peer_val); sockaddr_clear(&peer_val);
+ args[2]= ret_iddata(ip, sock, &dgram_socks);
+ scriptinv_invoke(&sock->script,3,args);
+
+ rc= 0;
+
+x_rc:
+ if (rc)
+ Tcl_BackgroundError(ip);
+}