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	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1982, 1986, 1989, 1993
	24	* The Regents of the University of California. All rights reserved.
	25	*
	26	* Redistribution and use in source and binary forms, with or without
	27	* modification, are permitted provided that the following conditions
	28	* are met:
	29	* 1. Redistributions of source code must retain the above copyright
	30	* notice, this list of conditions and the following disclaimer.
	31	* 2. Redistributions in binary form must reproduce the above copyright
	32	* notice, this list of conditions and the following disclaimer in the
	33	* documentation and/or other materials provided with the distribution.
	34	* 3. All advertising materials mentioning features or use of this software
	35	* must display the following acknowledgement:
	36	* This product includes software developed by the University of
	37	* California, Berkeley and its contributors.
	38	* 4. Neither the name of the University nor the names of its contributors
	39	* may be used to endorse or promote products derived from this software
	40	* without specific prior written permission.
	41	*
	42	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	43	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	44	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	45	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	46	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	47	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	48	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	49	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	50	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	51	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	52	* SUCH DAMAGE.
	53	*
	54	* @(#)unpcb.h 8.1 (Berkeley) 6/2/93
	55	*/
	56
	57	#ifndef _SYS_UNPCB_H_
	58	#define _SYS_UNPCB_H_
	59
	60	#include <sys/queue.h>
	61	#include <sys/un.h>
	62
	63	/*
	64	* Protocol control block for an active
	65	* instance of a UNIX internal protocol.
	66	*
	67	* A socket may be associated with an vnode in the
	68	* file system. If so, the unp_vnode pointer holds
	69	* a reference count to this vnode, which should be irele'd
	70	* when the socket goes away.
	71	*
	72	* A socket may be connected to another socket, in which
	73	* case the control block of the socket to which it is connected
	74	* is given by unp_conn.
	75	*
	76	* A socket may be referenced by a number of sockets (e.g. several
	77	* sockets may be connected to a datagram socket.) These sockets
	78	* are in a linked list starting with unp_refs, linked through
	79	* unp_nextref and null-terminated. Note that a socket may be referenced
	80	* by a number of other sockets and may also reference a socket (not
	81	* necessarily one which is referencing it). This generates
	82	* the need for unp_refs and unp_nextref to be separate fields.
	83	*
	84	* Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
	85	* so that changes in the sockbuf may be computed to modify
	86	* back pressure on the sender accordingly.
	87	*/
	88	typedef u_quad_t unp_gen_t;
	89	LIST_HEAD(unp_head, unpcb);
	90
	91	struct unpcb {
	92	LIST_ENTRY(unpcb) unp_link; /* glue on list of all PCBs */
	93	struct socket unp_socket; / pointer back to socket */
	94	struct vnode unp_vnode; / if associated with file */
	95	ino_t unp_ino; /* fake inode number */
	96	struct unpcb unp_conn; / control block of connected socket */
	97	struct unp_head unp_refs; /* referencing socket linked list */
	98	LIST_ENTRY(unpcb) unp_reflink; /* link in unp_refs list */
	99	struct sockaddr_un unp_addr; / bound address of socket */
	100	int unp_cc; /* copy of rcv.sb_cc */
	101	int unp_mbcnt; /* copy of rcv.sb_mbcnt */
	102	unp_gen_t unp_gencnt; /* generation count of this instance */
	103	};
	104
	105	#define sotounpcb(so) ((struct unpcb *)((so)->so_pcb))
	106
	107	/* Hack alert -- this structure depends on <sys/socketvar.h>. */
	108	#ifdef _SYS_SOCKETVAR_H_
	109	struct xunpcb {
	110	size_t xu_len; /* length of this structure */
	111	struct unpcb xu_unpp; / to help netstat, fstat */
	112	struct unpcb xu_unp; /* our information */
	113	union {
	114	struct sockaddr_un xuu_addr; /* our bound address */
	115	char xu_dummy1[256];
	116	} xu_au;
	117	#define xu_addr xu_au.xuu_addr
	118	union {
	119	struct sockaddr_un xuu_caddr; /* their bound address */
	120	char xu_dummy2[256];
	121	} xu_cau;
	122	#define xu_caddr xu_cau.xuu_caddr
	123	struct xsocket xu_socket;
	124	u_quad_t xu_alignment_hack;
	125	};
	126
	127	struct xunpgen {
	128	size_t xug_len;
	129	u_int xug_count;
	130	unp_gen_t xug_gen;
	131	so_gen_t xug_sogen;
	132	};
	133	#endif /* _SYS_SOCKETVAR_H_ */
	134
	135	#endif /* _SYS_UNPCB_H_ */