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Annotation of kernel/bsd/sys/unpcb.h, revision 1.1

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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