/*      $NetBSD: un.h,v 1.61 2023/11/08 19:27:13 jschauma 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. 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>
#include <sys/featuretest.h>
#include <sys/types.h>

#ifndef sa_family_t
typedef __sa_family_t   sa_family_t;
#define sa_family_t     __sa_family_t
#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 {
        uint8_t         sun_len;                /* total sockaddr length */
        sa_family_t     sun_family;             /* AF_LOCAL */
        char            sun_path[SUNPATHLEN];   /* path name (gag) */
};

/*
 * Socket options for UNIX IPC domain.
 */
#if defined(_NETBSD_SOURCE)
#define SOL_LOCAL       0               /* options level for getsockopt(2) */
#define LOCAL_OCREDS    0x0001          /* pass credentials to receiver */
#define LOCAL_CONNWAIT  0x0002          /* connects block until accepted */
#define LOCAL_PEEREID   0x0003          /* get peer identification */
#define LOCAL_CREDS     0x0004          /* pass credentials to receiver */
#endif

/*
 * Data automatically stored inside connect() for use by LOCAL_PEEREID
 */
struct unpcbid {
        pid_t unp_pid;          /* process id */
        uid_t unp_euid;         /* effective user id */
        gid_t unp_egid;         /* effective group id */
};

#ifdef _KERNEL

struct unpcb;
struct socket;
struct sockopt;
struct sockaddr;

extern const struct pr_usrreqs unp_usrreqs;

int     uipc_ctloutput(int, struct socket *, struct sockopt *);
void    uipc_init(void);
kmutex_t *uipc_dgramlock(void);
kmutex_t *uipc_streamlock(void);
kmutex_t *uipc_rawlock(void);

int     unp_connect(struct socket *, struct sockaddr *, struct lwp *);
int     unp_connect2(struct socket *, struct socket *);
void    unp_dispose(struct mbuf *);
int     unp_externalize(struct mbuf *, struct lwp *, int);

#else /* !_KERNEL */

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

#endif /* !_SYS_UN_H_ */