/*

 * 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"

#pragma weak _ftok = ftok

#include "lint.h"

#include "libc.h"

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/mkdev.h>

#include <sys/nvpair.h>

#include <fcntl.h>

#include <attr.h>

key_t

ftok(const char *path, int id)

{

	struct stat64 st;

	nvlist_t *nvp;

	uint32_t devpiece;

	int error;

	if (stat64(path, &st) < 0)

		return ((key_t)-1);

	/*

	 * if getattrat works then extract the FSID from the nvlist

	 * otherwise, just fall back and use the value from the stat data

	 */

	if ((error = getattrat(AT_FDCWD, XATTR_VIEW_READONLY,

	    path, &nvp)) == 0) {

		uint64_t value;

		if ((error = libc_nvlist_lookup_uint64(nvp,

		    A_FSID, &value)) == 0)

			devpiece = value & 0xfff;

		libc_nvlist_free(nvp);

	}

	if (error)

		devpiece = st.st_dev & 0xfff;

	return ((key_t)((key_t)id << 24 | devpiece << 12 |

	    ((uint32_t)st.st_ino & 0x0fff)));

}