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) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
27/*	  All Rights Reserved  	*/
28
29/*
30 * Portions of this source code were derived from Berkeley 4.3 BSD
31 * under license from the Regents of the University of California.
32 */
33
34#include <sys/param.h>
35#include <sys/isa_defs.h>
36#include <sys/types.h>
37#include <sys/sysmacros.h>
38#include <sys/systm.h>
39#include <sys/errno.h>
40#include <sys/vnode.h>
41#include <sys/file.h>
42#include <sys/fcntl.h>
43#include <sys/uio.h>
44#include <sys/debug.h>
45#include <c2/audit.h>
46
47/*
48 * Make a hard link.
49 */
50int
51linkat(int ffd, char *from, int tfd, char *to, int flag)
52{
53	vnode_t *fstartvp = NULL;
54	vnode_t *tstartvp = NULL;
55	enum symfollow follow;
56	int error;
57
58	if (flag & ~AT_SYMLINK_FOLLOW)
59		return (set_errno(EINVAL));
60	follow = (flag & AT_SYMLINK_FOLLOW)? FOLLOW : NO_FOLLOW;
61
62	if (from == NULL || to == NULL)
63		return (set_errno(EFAULT));
64	if ((error = fgetstartvp(ffd, from, &fstartvp)) != 0)
65		goto out;
66	if ((error = fgetstartvp(tfd, to, &tstartvp)) != 0)
67		goto out;
68
69	error = vn_linkat(fstartvp, from, follow, tstartvp, to, UIO_USERSPACE);
70
71out:
72	if (fstartvp != NULL)
73		VN_RELE(fstartvp);
74	if (tstartvp != NULL)
75		VN_RELE(tstartvp);
76	if (error)
77		return (set_errno(error));
78	return (0);
79}
80
81int
82link(char *from, char *to)
83{
84	return (linkat(AT_FDCWD, from, AT_FDCWD, to, 0));
85}
86