Annotation of sys/sys/unpcb.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: unpcb.h,v 1.7 2006/11/17 08:33:20 claudio Exp $ */
2: /* $NetBSD: unpcb.h,v 1.6 1994/06/29 06:46:08 cgd Exp $ */
3:
4: /*
5: * Copyright (c) 1982, 1986, 1989, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the University nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: *
32: * @(#)unpcb.h 8.1 (Berkeley) 6/2/93
33: */
34:
35: /*
36: * Protocol control block for an active
37: * instance of a UNIX internal protocol.
38: *
39: * A socket may be associated with an vnode in the
40: * file system. If so, the unp_vnode pointer holds
41: * a reference count to this vnode, which should be irele'd
42: * when the socket goes away.
43: *
44: * A socket may be connected to another socket, in which
45: * case the control block of the socket to which it is connected
46: * is given by unp_conn.
47: *
48: * A socket may be referenced by a number of sockets (e.g. several
49: * sockets may be connected to a datagram socket.) These sockets
50: * are in a linked list starting with unp_refs, linked through
51: * unp_nextref and null-terminated. Note that a socket may be referenced
52: * by a number of other sockets and may also reference a socket (not
53: * necessarily one which is referencing it). This generates
54: * the need for unp_refs and unp_nextref to be separate fields.
55: *
56: * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
57: * so that changes in the sockbuf may be computed to modify
58: * back pressure on the sender accordingly.
59: */
60: struct unpcbid {
61: uid_t unp_euid;
62: gid_t unp_egid;
63: };
64:
65: struct unpcb {
66: struct socket *unp_socket; /* pointer back to socket */
67: struct vnode *unp_vnode; /* if associated with file */
68: ino_t unp_ino; /* fake inode number */
69: struct unpcb *unp_conn; /* control block of connected socket */
70: struct unpcb *unp_refs; /* referencing socket linked list */
71: struct unpcb *unp_nextref; /* link in unp_refs list */
72: struct mbuf *unp_addr; /* bound address of socket */
73: int unp_flags; /* this unpcb contains peer eids */
74: struct unpcbid unp_connid; /* id of peer process */
75: int unp_cc; /* copy of rcv.sb_cc */
76: int unp_mbcnt; /* copy of rcv.sb_mbcnt */
77: struct timespec unp_ctime; /* holds creation time */
78: };
79:
80: /*
81: * flag bits in unp_flags
82: */
83: #define UNP_FEIDS 1 /* unp_connid contains information */
84: #define UNP_FEIDSBIND 2 /* unp_connid was set by a bind */
85:
86: #define sotounpcb(so) ((struct unpcb *)((so)->so_pcb))
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