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 (c) 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26 #include "lint.h"
27 #include <unistd.h>
28 #include <fcntl.h>
29 #include <sys/syscall.h>
30
31 extern int __xpg4; /* defined in port/gen/xpg4.c; 0 if not xpg4/xpg4v2 */
32
33 int
linkat(int fd1,const char * path1,int fd2,const char * path2,int flag)34 linkat(int fd1, const char *path1, int fd2, const char *path2, int flag)
35 {
36 return (syscall(SYS_linkat, fd1, path1, fd2, path2, flag));
37 }
38
39 #pragma weak _link = link
40 int
link(const char * path1,const char * path2)41 link(const char *path1, const char *path2)
42 {
43 /*
44 * XPG4v2 link() requires that the link count of a symbolic
45 * link target be updated rather than the link itself. This
46 * matches SunOS 4.x and other BSD based implementations.
47 * However, the SVR4 merge apparently introduced the change
48 * that allowed link(src, dest) when "src" was a symbolic link,
49 * to create "dest" as a hard link to "src". Hence, the link
50 * count of the symbolic link is updated rather than the target
51 * of the symbolic link. This latter behavior remains for
52 * non-XPG4 based environments. For a more detailed discussion,
53 * see bug 1256170.
54 */
55 if (__xpg4 != 0)
56 return (linkat(AT_FDCWD, path1, AT_FDCWD, path2,
57 AT_SYMLINK_FOLLOW));
58
59 #if defined(_RETAIN_OLD_SYSCALLS)
60 return (syscall(SYS_link, path1, path2));
61 #else
62 return (linkat(AT_FDCWD, path1, AT_FDCWD, path2, 0));
63 #endif
64 }
65