xref: /titanic_52/usr/src/lib/libc/port/gen/xpg6.c (revision 0eb822a1c0c2bea495647510b75f77f0e57633eb)
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, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 /*
30  * __xpg6 (C99/SUSv3) was first introduced in Solaris 10.
31  *
32  * This is the default value that is compiled into libc.
33  *
34  * The default setting, _C99SUSv3_mode_OFF, means to retain current
35  * Solaris behavior which is NOT C99 and SUSv3 compliant.
36  * This is normal.  libc determines which standard to use based on
37  * how applications are compiled.  libc at runtime determines which
38  * behavior to choose based on the value of __xpg6.
39  * But by default libc retains its original Solaris behavior.
40  *
41  * __xpg6 is used to control certain behaviors between the C99 standard,
42  * the SUSv3 standard, and Solaris.  More explanation in inc/xpg6.h.
43  * The XPG6 C compiler utility (c99) will add an object file that contains an
44  * alternate definition for __xpg6.  The symbol interposition provided
45  * by the linker will allow libc to find that symbol instead.
46  *
47  * Possible settings are available and documented in inc/xpg6.h.
48  */
49 
50 #include "xpg6.h"
51 
52 unsigned int __xpg6 = _C99SUSv3_mode_OFF;
53