_sd_export_ int sd_booted(void) {
#if defined(DISABLE_SYSTEMD) || !defined(__linux__)
        return 0;
#else
        struct stat st;

        /* We test whether the runtime unit file directory has been
         * created. This takes place in mount-setup.c, so is
         * guaranteed to happen very early during boot. */

        if (lstat("/run/systemd/system/", &st) < 0)
                return 0;

        return !!S_ISDIR(st.st_mode);
#endif
}