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/*
* Mach Operating System
* Copyright (c) 1989 Carnegie-Mellon University
* Copyright (c) 1988 Carnegie-Mellon University
* All rights reserved. The CMU software License Agreement specifies
* the terms and conditions for use and redistribution.
*/
/*
* HISTORY
* $Log: unpcb.h,v $
* Revision 2.5 89/04/22 15:32:42 gm0w
* Removed MACH_VFS changes.
* [89/04/14 gm0w]
*
* Revision 2.4 89/03/09 22:09:51 rpd
* More cleanup.
*
* Revision 2.3 89/02/25 17:58:00 gm0w
* Made dependencies on MACH_VFS only be used inside
* KERNEL. Outside of kernel old names must be used.
* [89/02/14 mrt]
*
* Revision 2.2 89/01/18 01:20:24 jsb
* Vnode support: change inodes to vnodes.
* [89/01/13 jsb]
*
*/
/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
* @(#)unpcb.h 7.1 (Berkeley) 6/4/86
*/
/*
* 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.
*/
#ifndef _SYS_UNPCB_H_
#define _SYS_UNPCB_H_
#import <sys/types.h>
struct unpcb {
struct socket *unp_socket; /* pointer back to socket */
struct vnode *unp_vnode; /* if associated with file */
ino_t unp_vno; /* fake vnode 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))
#endif
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