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 /*
31 * Attach a STREAMS or door based file descriptor to an object in the file
32 * system name space.
33 */
34
35 #pragma weak _fattach = fattach
36
37 #include "lint.h"
38 #include <sys/types.h>
39 #include <errno.h>
40 #include <stdio.h>
41 #include <stropts.h>
42 #include <sys/door.h>
43 #include <sys/fs/namenode.h>
44 #include <sys/mount.h>
45 #include <unistd.h>
46 #include <string.h>
47 #include "libc.h"
48
49 int
fattach(int fildes,const char * path)50 fattach(int fildes, const char *path)
51 {
52 struct namefd namefdp;
53 struct door_info dinfo;
54 int s;
55 char buf[MAXPATHLEN];
56
57 /* Only STREAMS and doors allowed to be mounted */
58 if ((s = isastream(fildes)) == 1 || __door_info(fildes, &dinfo) == 0) {
59 namefdp.fd = fildes;
60 if (path == NULL || *path == '\0') {
61 errno = ENOENT;
62 return (-1);
63 } else if (*path != '/') {
64 /*
65 * The mount point must be an absolute path.
66 */
67 if (getcwd(buf, sizeof (buf)) == NULL) {
68 /* errno already set */
69 return (-1);
70 }
71 /*
72 * The kernel will truncate the path if it would have
73 * turned into something more than MAXPATHLEN bytes.
74 * So we do the same here.
75 */
76 if (strlcat(buf, "/", sizeof (buf)) >= sizeof (buf) ||
77 strlcat(buf, path, sizeof (buf)) >= sizeof (buf)) {
78 errno = ENAMETOOLONG;
79 return (-1);
80 }
81 path = buf;
82 }
83 return (mount((char *)NULL, path, MS_DATA|MS_NOMNTTAB,
84 (const char *)"namefs", (char *)&namefdp,
85 sizeof (struct namefd), NULL, 0));
86 } else if (s == 0) {
87 /* Not a STREAM */
88 errno = EINVAL;
89 return (-1);
90 } else {
91 /* errno already set */
92 return (-1);
93 }
94 }
95