if( epoll_ctl( eps->ep_fd, EPOLL_CTL_ADD, eps->nng_fd, &eps->epe ) != 0 ) {
fprintf( stderr, "[FAIL] epoll_ctl status not 0 : %s\n", strerror( errno ) );
free( eps );
if( epoll_ctl( eps->ep_fd, EPOLL_CTL_ADD, eps->nng_fd, &eps->epe ) != 0 ) {
fprintf( stderr, "[FAIL] epoll_ctl status not 0 : %s\n", strerror( errno ) );
free( eps );