r = sd_is_socket(p.listen_fd, 0, SOCK_STREAM, 1);
if (r < 0) {
log_error("Error %d while checking inherited socket: %s", r, strerror(-r));
r = sd_is_socket(p.listen_fd, 0, SOCK_STREAM, 1);
if (r < 0) {
log_error("Error %d while checking inherited socket: %s", r, strerror(-r));