- changed select to uselect

- some fixes in tecs.c

tecs/coc_client.c

@@ -172,7 +172,7 @@ int CocCmdWithRetry(CocConn *conn) {
     }
     iret=CocTryCmd(conn);
     if (iret>=0) break;
-    close(conn->fd);
+    if (conn->fd > 0) close(conn->fd);
     conn->fd=-1;
     if (iret==-1) goto OnError; /* severe error */
     ErrShort(ErrMessage);