1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*
28 *	Copyright (c) 1988 AT&T
29 *	All Rights Reserved.
30 */
31
32#pragma ident	"%Z%%M%	%I%	%E% SMI"
33
34/*
35 * NOTE: The environment symbol pair may also occur in crt1.o.  The definitions
36 * within crt1.o are required for the generation of ABI compliant applications
37 * (see bugid 1181124).  No other symbol definitions should be added to this
38 * file.
39 */
40
41/*
42 * The original SVR3 ABI states:
43 *
44 * Application Constraints
45 * As described above, libsys provides symbols for applications. In a few cases,
46 * however, an application is obliged to provide symbols for the library.
47 *
48 * extern char **environ;
49 *     Normally, this symbol is synonymous with environ, as
50 *     exec(BA_OS) describes.  This isn't always true, though, because
51 *     ANSI C does not define environ.  Thus, an ANSI C-conforming
52 *     application can define its own environ symbol, unrelated to the pro-
53 *     cess environment.  If the application defines environ and intends it
54 *     to have the System V Interface Definition, Third Edition semantics, it
55 *     must also define _environ so that the two symbols refer to the same
56 *     data object.
57 *
58 * The ABI description implies that the process environment should use
59 * _environ and that nothing in libc should make reference to the unadorned
60 * "environ" symbol.  This way, an application can define and use a symbol
61 * named "environ" for its own purposes without affecting the actual
62 * process environment.
63 */
64
65#pragma weak environ = _environ
66const char **_environ = 0;
67