/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

/*	Copyright (c) 1988 AT&T	*/

/*	  All Rights Reserved  	*/

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*

 * Attach a STREAMS or door based file descriptor to an object in the file

 * system name space.

 */

#pragma weak _fattach = fattach

#include "lint.h"

#include <sys/types.h>

#include <errno.h>

#include <stdio.h>

#include <stropts.h>

#include <sys/door.h>

#include <sys/fs/namenode.h>

#include <sys/mount.h>

#include <unistd.h>

#include <string.h>

#include "libc.h"

int

fattach(int fildes, const char *path)

{

	struct namefd  namefdp;

	struct door_info dinfo;

	int	s;

	char buf[MAXPATHLEN];

	/* Only STREAMS and doors allowed to be mounted */

	if ((s = isastream(fildes)) == 1 || __door_info(fildes, &dinfo) == 0) {

		namefdp.fd = fildes;

		if (path == NULL || *path == '\0') {

			errno = ENOENT;

			return (-1);

		} else if (*path != '/') {

			/*

			 * The mount point must be an absolute path.

			 */

			if (getcwd(buf, sizeof (buf)) == NULL) {

				/* errno already set */

				return (-1);

			}

			/*

			 * The kernel will truncate the path if it would have

			 * turned into something more than MAXPATHLEN bytes.

			 * So we do the same here.

			 */

			if (strlcat(buf, "/",  sizeof (buf)) >= sizeof (buf) ||

			    strlcat(buf, path, sizeof (buf)) >= sizeof (buf)) {

				errno = ENAMETOOLONG;

				return (-1);

			}

			path = buf;

		}

		return (mount((char *)NULL, path, MS_DATA|MS_NOMNTTAB,

		    (const char *)"namefs", (char *)&namefdp,

		    sizeof (struct namefd), NULL, 0));

	} else if (s == 0) {

		/* Not a STREAM */

		errno = EINVAL;

		return (-1);

	} else {

		/* errno already set */

		return (-1);

	}

}