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- /*
- * 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))
-