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 /* Copyright (c) 1988 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI"
31
32 #pragma weak _ftok = ftok
33
34 #include "lint.h"
35 #include "libc.h"
36 #include <sys/types.h>
37 #include <sys/stat.h>
38 #include <sys/mkdev.h>
39 #include <sys/nvpair.h>
40 #include <fcntl.h>
41 #include <attr.h>
42
43 key_t
ftok(const char * path,int id)44 ftok(const char *path, int id)
45 {
46 struct stat64 st;
47 nvlist_t *nvp;
48 uint32_t devpiece;
49 int error;
50
51 if (stat64(path, &st) < 0)
52 return ((key_t)-1);
53
54 /*
55 * if getattrat works then extract the FSID from the nvlist
56 * otherwise, just fall back and use the value from the stat data
57 */
58 if ((error = getattrat(AT_FDCWD, XATTR_VIEW_READONLY,
59 path, &nvp)) == 0) {
60 uint64_t value;
61
62 if ((error = libc_nvlist_lookup_uint64(nvp,
63 A_FSID, &value)) == 0)
64 devpiece = value & 0xfff;
65 libc_nvlist_free(nvp);
66 }
67
68 if (error)
69 devpiece = st.st_dev & 0xfff;
70
71 return ((key_t)((key_t)id << 24 | devpiece << 12 |
72 ((uint32_t)st.st_ino & 0x0fff)));
73 }
74