80 lines
3.5 KiB
C
80 lines
3.5 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)unpcb.h 8.1 (Berkeley) 6/2/93
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* $Id: unpcb.h,v 1.2 1994/08/02 07:54:05 davidg Exp $
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*/
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#ifndef _SYS_UNPCB_H_
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#define _SYS_UNPCB_H_
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/*
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* Protocol control block for an active
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* instance of a UNIX internal protocol.
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*
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* A socket may be associated with an vnode in the
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* file system. If so, the unp_vnode pointer holds
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* a reference count to this vnode, which should be irele'd
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* when the socket goes away.
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*
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* A socket may be connected to another socket, in which
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* case the control block of the socket to which it is connected
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* is given by unp_conn.
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*
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* A socket may be referenced by a number of sockets (e.g. several
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* sockets may be connected to a datagram socket.) These sockets
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* are in a linked list starting with unp_refs, linked through
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* unp_nextref and null-terminated. Note that a socket may be referenced
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* by a number of other sockets and may also reference a socket (not
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* necessarily one which is referencing it). This generates
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* the need for unp_refs and unp_nextref to be separate fields.
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*
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* Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
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* so that changes in the sockbuf may be computed to modify
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* back pressure on the sender accordingly.
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*/
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struct unpcb {
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struct socket *unp_socket; /* pointer back to socket */
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struct vnode *unp_vnode; /* if associated with file */
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ino_t unp_ino; /* fake inode number */
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struct unpcb *unp_conn; /* control block of connected socket */
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struct unpcb *unp_refs; /* referencing socket linked list */
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struct unpcb *unp_nextref; /* link in unp_refs list */
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struct mbuf *unp_addr; /* bound address of socket */
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int unp_cc; /* copy of rcv.sb_cc */
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int unp_mbcnt; /* copy of rcv.sb_mbcnt */
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};
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#define sotounpcb(so) ((struct unpcb *)((so)->so_pcb))
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#endif
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