+int do_dgram_socket_transmit(ClientData cd, Tcl_Interp *ip,
+ DgramSocket *sock, HBytes_Value data,
+ SockAddr_Value remote) {
+ int l, r;
+
+ r= sendto(sock->fd,
+ hbytes_data(&data), l=hbytes_len(&data),
+ 0,
+ sockaddr_addr(&remote), sockaddr_len(&remote));
+ if (r==-1) return posixerr(ip,errno,"sendto");
+ else if (r!=l) return staticerr(ip,"sendto gave wrong answer",0);
+ return TCL_OK;
+}
+
+static void cancel(DgramSocket *sock) {
+ if (sock->script) {
+ Tcl_DeleteFileHandler(sock->fd);
+ Tcl_DecrRefCount(sock->script);
+ sock->script= 0;
+ }
+}
+
+static void recv_call(ClientData sock_cd, int mask) {
+ DgramSocket *sock= (void*)sock_cd;
+ Tcl_Interp *ip= sock->ip;
+ int sz, rc, i, peek;
+ HBytes_Value message_val;
+ SockAddr_Value peer_val;
+ Tcl_Obj *args[3], *invoke;
+ struct msghdr mh;
+ struct iovec iov;
+
+ hbytes_empty(&message_val);
+ sockaddr_clear(&peer_val);
+ invoke=0; for (i=0; i<3; i++) args[i]=0;
+
+ 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) { rc=0; 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);
+ }