[unix-history] / usr / src / sys.386bsd / sys / unpcb.h

/*
 * Copyright (c) 1982, 1986, 1989 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.
 *
 *	@(#)unpcb.h	7.6 (Berkeley) 6/28/90
 */

/*
 * Protocol control block for an active
 * instance of a UNIX internal protocol.
 *
 * A socket may be associated with an vnode in the
 * file system.  If so, the unp_vnode pointer holds
 * a reference count to this vnode, which should be irele'd
 * when the socket goes away.
 *
 * A socket may be connected to another socket, in which
 * case the control block of the socket to which it is connected
 * is given by unp_conn.
 *
 * A socket may be referenced by a number of sockets (e.g. several
 * sockets may be connected to a datagram socket.)  These sockets
 * are in a linked list starting with unp_refs, linked through
 * unp_nextref and null-terminated.  Note that a socket may be referenced
 * by a number of other sockets and may also reference a socket (not
 * necessarily one which is referencing it).  This generates
 * the need for unp_refs and unp_nextref to be separate fields.
 *
 * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
 * so that changes in the sockbuf may be computed to modify
 * back pressure on the sender accordingly.
 */
struct	unpcb {
	struct	socket *unp_socket;	/* pointer back to socket */
	struct	vnode *unp_vnode;	/* if associated with file */
	ino_t	unp_ino;		/* fake inode number */
	struct	unpcb *unp_conn;	/* control block of connected socket */
	struct	unpcb *unp_refs;	/* referencing socket linked list */
	struct 	unpcb *unp_nextref;	/* link in unp_refs list */
	struct	mbuf *unp_addr;		/* bound address of socket */
	int	unp_cc;			/* copy of rcv.sb_cc */
	int	unp_mbcnt;		/* copy of rcv.sb_mbcnt */
};

#define	sotounpcb(so)	((struct unpcb *)((so)->so_pcb))
Commit	Line	Data
b688fc87 WJ	1	/*
	2	* Copyright (c) 1982, 1986, 1989 Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*
	33	* @(#)unpcb.h 7.6 (Berkeley) 6/28/90
	34	*/
	35
	36	/*
	37	* Protocol control block for an active
	38	* instance of a UNIX internal protocol.
	39	*
	40	* A socket may be associated with an vnode in the
	41	* file system. If so, the unp_vnode pointer holds
	42	* a reference count to this vnode, which should be irele'd
	43	* when the socket goes away.
	44	*
	45	* A socket may be connected to another socket, in which
	46	* case the control block of the socket to which it is connected
	47	* is given by unp_conn.
	48	*
	49	* A socket may be referenced by a number of sockets (e.g. several
	50	* sockets may be connected to a datagram socket.) These sockets
	51	* are in a linked list starting with unp_refs, linked through
	52	* unp_nextref and null-terminated. Note that a socket may be referenced
	53	* by a number of other sockets and may also reference a socket (not
	54	* necessarily one which is referencing it). This generates
	55	* the need for unp_refs and unp_nextref to be separate fields.
	56	*
	57	* Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
	58	* so that changes in the sockbuf may be computed to modify
	59	* back pressure on the sender accordingly.
	60	*/
	61	struct unpcb {
	62	struct socket unp_socket; / pointer back to socket */
	63	struct vnode unp_vnode; / if associated with file */
	64	ino_t unp_ino; /* fake inode number */
65	struct unpcb unp_conn; / control block of connected socket */
66	struct unpcb unp_refs; / referencing socket linked list */
67	struct unpcb unp_nextref; / link in unp_refs list */
68	struct mbuf unp_addr; / bound address of socket */
69	int unp_cc; /* copy of rcv.sb_cc */
70	int unp_mbcnt; /* copy of rcv.sb_mbcnt */
71	};
72
73	#define sotounpcb(so) ((struct unpcb *)((so)->so_pcb))