/*

 * Copyright (c) 2000, 2013, 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.

 *

 */

@jdk.Exported

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();

    }

}