zfs/include/sys/pathname.h

/*
 * 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]
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/*
 * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
 */

/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*
 * Portions of this source code were derived from Berkeley 4.3 BSD
 * under license from the Regents of the University of California.
 */

#ifndef _SYS_PATHNAME_H
#define	_SYS_PATHNAME_H

#ifdef	__cplusplus
extern "C" {
#endif

/*
 * Pathname structure.
 * System calls that operate on path names gather the path name
 * from the system call into this structure and reduce it by
 * peeling off translated components.  If a symbolic link is
 * encountered the new path name to be translated is also
 * assembled in this structure.
 *
 * By convention pn_buf is not changed once it's been set to point
 * to the underlying storage; routines which manipulate the pathname
 * do so by changing pn_path and pn_pathlen.  pn_pathlen is redundant
 * since the path name is null-terminated, but is provided to make
 * some computations faster.
 */
typedef struct pathname {
	char	*pn_buf;		/* underlying storage */
#if 0 /* unused in ZoL */
	char	*pn_path;		/* remaining pathname */
	size_t	pn_pathlen;		/* remaining length */
#endif
	size_t	pn_bufsize;		/* total size of pn_buf */
} pathname_t;

extern void	pn_alloc(struct pathname *);
extern void	pn_alloc_sz(struct pathname *, size_t);
extern void	pn_free(struct pathname *);

#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_PATHNAME_H */