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 */
50 int
linkat(int ffd,char * from,int tfd,char * to,int flag)51 linkat(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
71 out:
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
81 int
link(char * from,char * to)82 link(char *from, char *to)
83 {
84 return (linkat(AT_FDCWD, from, AT_FDCWD, to, 0));
85 }
86