ret = para_select(fd + 1, NULL, &wfds, &tv);
if (ret > 0) {
ret = write(fd, msg, len);
PARA_DEBUG_LOG("dumped %s to fd %d, ret = %d\n", msg, fd, ret);
ret = para_select(fd + 1, NULL, &wfds, &tv);
if (ret > 0) {
ret = write(fd, msg, len);
PARA_DEBUG_LOG("dumped %s to fd %d, ret = %d\n", msg, fd, ret);