int prepareForShutdown(int flags) {
    int save = flags & SHUTDOWN_SAVE;
    int nosave = flags & SHUTDOWN_NOSAVE;

    serverLog(LL_WARNING,"User requested shutdown...");

    /* Kill all the Lua debugger forked sessions. */
    ldbKillForkedSessions();

    /* Kill the saving child if there is a background saving in progress.
       We want to avoid race conditions, for instance our saving child may
       overwrite the synchronous saving did by SHUTDOWN. */
    if (server.rdb_child_pid != -1) {
        serverLog(LL_WARNING,"There is a child saving an .rdb. Killing it!");
        kill(server.rdb_child_pid,SIGUSR1);
        rdbRemoveTempFile(server.rdb_child_pid);
    }

    if (server.aof_state != AOF_OFF) {
        /* Kill the AOF saving child as the AOF we already have may be longer
         * but contains the full dataset anyway. */
        if (server.aof_child_pid != -1) {
            /* If we have AOF enabled but haven't written the AOF yet, don't
             * shutdown or else the dataset will be lost. */
            if (server.aof_state == AOF_WAIT_REWRITE) {
                serverLog(LL_WARNING, "Writing initial AOF, can't exit.");
                return C_ERR;
            }
            serverLog(LL_WARNING,
                "There is a child rewriting the AOF. Killing it!");
            kill(server.aof_child_pid,SIGUSR1);
        }
        /* Append only file: fsync() the AOF and exit */
        serverLog(LL_NOTICE,"Calling fsync() on the AOF file.");
        aof_fsync(server.aof_fd);
    }

    /* Create a new RDB file before exiting. */
    if ((server.saveparamslen > 0 && !nosave) || save) {
        serverLog(LL_NOTICE,"Saving the final RDB snapshot before exiting.");
        /* Snapshotting. Perform a SYNC SAVE and exit */
        if (rdbSave(server.rdb_filename) != C_OK) {
            /* Ooops.. error saving! The best we can do is to continue
             * operating. Note that if there was a background saving process,
             * in the next cron() Redis will be notified that the background
             * saving aborted, handling special stuff like slaves pending for
             * synchronization... */
            serverLog(LL_WARNING,"Error trying to save the DB, can't exit.");
            return C_ERR;
        }
    }

    /* Remove the pid file if possible and needed. */
    if (server.daemonize || server.pidfile) {
        serverLog(LL_NOTICE,"Removing the pid file.");
        unlink(server.pidfile);
    }

    /* Best effort flush of slave output buffers, so that we hopefully
     * send them pending writes. */
    flushSlavesOutputBuffers();

    /* Close the listening sockets. Apparently this allows faster restarts. */
    closeListeningSockets(1);
    serverLog(LL_WARNING,"%s is now ready to exit, bye bye...",
        server.sentinel_mode ? "Sentinel" : "Redis");
    return C_OK;
}

This label identifies security gaps where expected security features are missing or only partially implemented, reducing protection against unauthorized access or manipulation.