1 /* VMSecurityManager.java -- Reference implementation of VM hooks for security
2 Copyright (C) 1998, 2002 Free Software Foundation
3
4 This file is part of GNU Classpath.
5
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA.
20
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
37
38 package java.lang;
39
40 /**
41 * VMSecurityManager is a helper class for SecurityManager the VM must
42 * implement.
43 *
44 * @author John Keiser
45 * @author Eric Blake <ebb9@email.byu.edu>
46 */
47 final class VMSecurityManager
48 {
49 /**
50 * Get a list of all the classes currently executing methods on the
51 * Java stack. getClassContext()[0] is the currently executing method, ie.
52 * the method which called SecurityManager.getClassContext(). (Hint: you
53 * may need to pop off one or more frames: don't include SecurityManager
54 * or VMSecurityManager.getClassContext in your result. Also, be sure that
55 * you correctly handle the context if SecurityManager.getClassContext
56 * was invoked by reflection).
57 *
58 * @return an array of the declaring classes of each stack frame
59 */
60 static native Class[] getClassContext();
61
62 /**
63 * Get the current ClassLoader. This is the first non-null class loader
64 * on the stack, if one exists, stopping either at the end of the stack
65 * or the first instance of a PrivilegedAction. In other words, this call
66 * automatically unwinds past all classes loaded by the bootstrap loader,
67 * where getClassLoader() returns null, to get to the user class that
68 * really invoked the call that needs a classloader.
69 *
70 * @return the current ClassLoader
71 */
72 static native ClassLoader currentClassLoader();
73 }
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