/* * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.security.auth.module; /** * <p> This class implementation retrieves and makes available Unix * UID/GID/groups information for the current user. * */public class UnixSystem {     private native void getUnixInfo();     protected String username;    protected long uid;    protected long gid;    protected long[] groups;     /**     * Instantiate a <code>UnixSystem</code> and load     * the native library to access the underlying system information.     */    public UnixSystem() {        System.loadLibrary("jaas_unix");        getUnixInfo();    }     /**     * Get the username for the current Unix user.     *     * <p>     *     * @return the username for the current Unix user.     */    public String getUsername() {        return username;    }     /**     * Get the UID for the current Unix user.     *     * <p>     *     * @return the UID for the current Unix user.     */    public long getUid() {        return uid;    }     /**     * Get the GID for the current Unix user.     *     * <p>     *     * @return the GID for the current Unix user.     */    public long getGid() {        return gid;    }     /**     * Get the supplementary groups for the current Unix user.     *     * <p>     *     * @return the supplementary groups for the current Unix user.     */    public long[] getGroups() {        return groups == null ? null : groups.clone();    }}