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Avoid recursion with traditional cpp.

/*	$NetBSD: un.h,v 1.25 2000/07/28 09:33:29 kleink Exp $	*/

/*
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)un.h	8.3 (Berkeley) 2/19/95
 */

#ifndef _SYS_UN_H_
#define _SYS_UN_H_

#include <sys/ansi.h>

#ifndef sa_family_t
typedef __sa_family_t	sa_family_t;
#define sa_family_t	__sa_family_t
#endif

/*
 * Definitions for UNIX IPC domain.
 */
struct	sockaddr_un {
	u_int8_t	sun_len;	/* total sockaddr length */
	sa_family_t	sun_family;	/* AF_LOCAL */
	char		sun_path[104];	/* path name (gag) */
};

/*
 * Socket options for UNIX IPC domain.
 */
#if !defined(_XOPEN_SOURCE)
#define	LOCAL_CREDS	0x0001		/* pass credentials to receiver */
#endif

#ifdef _KERNEL
struct unpcb;
struct socket;

int	unp_attach __P((struct socket *so));
int	unp_bind __P((struct unpcb *unp, struct mbuf *nam, struct proc *p));
int	unp_connect __P((struct socket *so, struct mbuf *nam, struct proc *p));
int	unp_connect2 __P((struct socket *so, struct socket *so2));
void	unp_detach __P((struct unpcb *unp));
void	unp_discard __P((struct file *fp));
void	unp_disconnect __P((struct unpcb *unp));
void	unp_drop __P((struct unpcb *unp, int errno));
void	unp_gc __P((void));
void	unp_mark __P((struct file *fp));
void	unp_scan __P((struct mbuf *m0, void (*op)(struct file *), int));
void	unp_shutdown __P((struct unpcb *unp));
int 	unp_externalize __P((struct mbuf *));
int	unp_internalize __P((struct mbuf *, struct proc *));
void 	unp_dispose __P((struct mbuf *));
int	unp_output __P((struct mbuf *, struct mbuf *, struct unpcb *,
	    struct proc *));
void	unp_setsockaddr __P((struct unpcb *, struct mbuf *));
void	unp_setpeeraddr __P((struct unpcb *, struct mbuf *));
#else /* !_KERNEL */

/* actual length of an initialized sockaddr_un */
#if !defined(_XOPEN_SOURCE)
#define SUN_LEN(su) \
	(sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path))
#endif /* !_XOPEN_SOURCE */
#endif /* _KERNEL */

#endif /* !_SYS_UN_H_ */