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/*
33 * Attach a STREAMS or door based file descriptor to an object in the file
34 * system name space.
35 */
36
37#pragma weak _fattach = fattach
38
39#include "lint.h"
40#include <sys/types.h>
41#include <errno.h>
42#include <stdio.h>
43#include <stropts.h>
44#include <sys/door.h>
45#include <sys/fs/namenode.h>
46#include <sys/mount.h>
47#include <unistd.h>
48#include <string.h>
49#include "libc.h"
50
51int
52fattach(int fildes, const char *path)
53{
54	struct namefd  namefdp;
55	struct door_info dinfo;
56	int	s;
57	char buf[MAXPATHLEN];
58
59	/* Only STREAMS and doors allowed to be mounted */
60	if ((s = isastream(fildes)) == 1 || __door_info(fildes, &dinfo) == 0) {
61		namefdp.fd = fildes;
62		if (path == NULL || *path == '\0') {
63			errno = ENOENT;
64			return (-1);
65		} else if (*path != '/') {
66			/*
67			 * The mount point must be an absolute path.
68			 */
69			if (getcwd(buf, sizeof (buf)) == NULL) {
70				/* errno already set */
71				return (-1);
72			}
73			/*
74			 * The kernel will truncate the path if it would have
75			 * turned into something more than MAXPATHLEN bytes.
76			 * So we do the same here.
77			 */
78			if (strlcat(buf, "/",  sizeof (buf)) >= sizeof (buf) ||
79			    strlcat(buf, path, sizeof (buf)) >= sizeof (buf)) {
80				errno = ENAMETOOLONG;
81				return (-1);
82			}
83			path = buf;
84		}
85		return (mount((char *)NULL, path, MS_DATA|MS_NOMNTTAB,
86		    (const char *)"namefs", (char *)&namefdp,
87		    sizeof (struct namefd), NULL, 0));
88	} else if (s == 0) {
89		/* Not a STREAM */
90		errno = EINVAL;
91		return (-1);
92	} else {
93		/* errno already set */
94		return (-1);
95	}
96}
97