[Minor] Slightly improve logging in case of termination

src/libserver/rspamd_control.c

@@ -655,10 +655,15 @@ rspamd_control_default_worker_handler (EV_P_ ev_io *w, int revents)
 	r = recvmsg (w->fd, &msg, 0);
 
 	if (r == -1) {
-		msg_err ("cannot read request from the control socket: %s",
-				strerror (errno));
-
 		if (errno != EAGAIN && errno != EINTR) {
+			if (errno != ECONNRESET) {
+				/*
+				 * In case of connection reset it means that main process
+				 * has died, so do not pollute logs
+				 */
+				msg_err ("cannot read request from the control socket: %s",
+						strerror (errno));
+			}
 			ev_io_stop (cd->ev_base, &cd->io_ev);
 			close (w->fd);
 		}

src/lua/lua_worker.c

@@ -841,7 +841,8 @@ lua_worker_spawn_process (lua_State *L)
 		/* Wait for parent to reply and exit */
 		rc = read (cbdata->sp[1], inbuf, sizeof (inbuf));
 
-		if (memcmp (inbuf, "\0\0\0\0", 4) == 0) {
+		if (rc >= sizeof (inbuf) &&
+			memcmp (inbuf, "\0\0\0\0", sizeof (inbuf)) == 0) {
 			exit (EXIT_SUCCESS);
 		}
 		else {

src/rspamd.c

@@ -1092,11 +1092,13 @@ rspamd_cld_handler (EV_P_ ev_child *w, struct rspamd_main *rspamd_main,
 		close (wrk->srv_pipe[0]);
 	}
 
-	cmd.type = RSPAMD_CONTROL_CHILD_CHANGE;
-	cmd.cmd.child_change.what = rspamd_child_terminated;
-	cmd.cmd.child_change.pid = wrk->pid;
-	cmd.cmd.child_change.additional = w->rstatus;
-	rspamd_control_broadcast_srv_cmd (rspamd_main, &cmd, wrk->pid);
+	if (!rspamd_main->wanna_die) {
+		cmd.type = RSPAMD_CONTROL_CHILD_CHANGE;
+		cmd.cmd.child_change.what = rspamd_child_terminated;
+		cmd.cmd.child_change.pid = wrk->pid;
+		cmd.cmd.child_change.additional = w->rstatus;
+		rspamd_control_broadcast_srv_cmd (rspamd_main, &cmd, wrk->pid);
+	}
 
 	if (wrk->finish_actions) {
 		g_ptr_array_free (wrk->finish_actions, TRUE);