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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
26: /*
27: * Copyright (c) 1982, 1986, 1989, 1993
28: * The Regents of the University of California. All rights reserved.
29: *
30: * Redistribution and use in source and binary forms, with or without
31: * modification, are permitted provided that the following conditions
32: * are met:
33: * 1. Redistributions of source code must retain the above copyright
34: * notice, this list of conditions and the following disclaimer.
35: * 2. Redistributions in binary form must reproduce the above copyright
36: * notice, this list of conditions and the following disclaimer in the
37: * documentation and/or other materials provided with the distribution.
38: * 3. All advertising materials mentioning features or use of this software
39: * must display the following acknowledgement:
40: * This product includes software developed by the University of
41: * California, Berkeley and its contributors.
42: * 4. Neither the name of the University nor the names of its contributors
43: * may be used to endorse or promote products derived from this software
44: * without specific prior written permission.
45: *
46: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
47: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
50: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56: * SUCH DAMAGE.
57: *
58: * @(#)unpcb.h 8.1 (Berkeley) 6/2/93
59: */
60:
61: #ifndef _SYS_UNPCB_H_
62: #define _SYS_UNPCB_H_
63:
64: /*
65: * Protocol control block for an active
66: * instance of a UNIX internal protocol.
67: *
68: * A socket may be associated with an vnode in the
69: * file system. If so, the unp_vnode pointer holds
70: * a reference count to this vnode, which should be irele'd
71: * when the socket goes away.
72: *
73: * A socket may be connected to another socket, in which
74: * case the control block of the socket to which it is connected
75: * is given by unp_conn.
76: *
77: * A socket may be referenced by a number of sockets (e.g. several
78: * sockets may be connected to a datagram socket.) These sockets
79: * are in a linked list starting with unp_refs, linked through
80: * unp_nextref and null-terminated. Note that a socket may be referenced
81: * by a number of other sockets and may also reference a socket (not
82: * necessarily one which is referencing it). This generates
83: * the need for unp_refs and unp_nextref to be separate fields.
84: *
85: * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
86: * so that changes in the sockbuf may be computed to modify
87: * back pressure on the sender accordingly.
88: */
89: struct unpcb {
90: struct socket *unp_socket; /* pointer back to socket */
91: struct vnode *unp_vnode; /* if associated with file */
92: ino_t unp_ino; /* fake inode number */
93: struct unpcb *unp_conn; /* control block of connected socket */
94: struct unpcb *unp_refs; /* referencing socket linked list */
95: struct unpcb *unp_nextref; /* link in unp_refs list */
96: struct mbuf *unp_addr; /* bound address of socket */
97: int unp_cc; /* copy of rcv.sb_cc */
98: int unp_mbcnt; /* copy of rcv.sb_mbcnt */
99: };
100:
101: #define sotounpcb(so) ((struct unpcb *)((so)->so_pcb))
102: #endif /* !_SYS_UNPCB_H_ */
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