/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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. 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.
 */

#ifndef _SYS_UN_H_
#define _SYS_UN_H_

#include <sys/cdefs.h>
#include <bsdsocket/types.h>

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

/*
 * Historically, (struct sockaddr) needed to fit inside an mbuf.
 * For this reason, UNIX domain sockets were therefore limited to
 * 104 bytes. While this limit is no longer necessary, it is kept for
 * binary compatibility reasons.
 */
#define	SUNPATHLEN	104

/*
 * Definitions for UNIX IPC domain.
 */
struct sockaddr_un {
	unsigned char	sun_len;	/* sockaddr len including null */
	sa_family_t	sun_family;	/* AF_UNIX */
	char	sun_path[SUNPATHLEN];	/* path name (gag) */
};

#if __BSD_VISIBLE

/* Socket options. */
#define	LOCAL_PEERCRED		    1	/* retrieve peer credentials */
#define	LOCAL_CREDS		        2	/* pass credentials to receiver */
#define	LOCAL_CREDS_PERSISTENT	3	/* pass credentials to receiver */
#define	LOCAL_CONNWAIT		    4	/* connects block until accepted */

#ifdef _KERNEL
struct mbuf;
struct socket;
struct sockopt;

int	uipc_connect2(struct socket *so1, struct socket *so2);
int	uipc_ctloutput(struct socket *so, struct sockopt *sopt);
int	uipc_usrreq(struct socket *so, int req, struct mbuf *m,
		struct mbuf *nam, struct mbuf *control);
void	unp_dispose(struct mbuf *m);
int	unp_externalize(struct mbuf *mbuf, struct mbuf **controlp);
void	unp_init(void);
extern	struct pr_usrreqs uipc_usrreqs;

#else /* !_KERNEL */

/* actual length of an initialized sockaddr_un */
#define SUN_LEN(su) \
	(sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path))

#endif /* _KERNEL */

#endif /* __BSD_VISIBLE */

#endif /* !_SYS_UN_H_ */
