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Annotation of Net2/sys/unpcb.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)unpcb.h     7.6 (Berkeley) 6/28/90
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * Protocol control block for an active
        !            38:  * instance of a UNIX internal protocol.
        !            39:  *
        !            40:  * A socket may be associated with an vnode in the
        !            41:  * file system.  If so, the unp_vnode pointer holds
        !            42:  * a reference count to this vnode, which should be irele'd
        !            43:  * when the socket goes away.
        !            44:  *
        !            45:  * A socket may be connected to another socket, in which
        !            46:  * case the control block of the socket to which it is connected
        !            47:  * is given by unp_conn.
        !            48:  *
        !            49:  * A socket may be referenced by a number of sockets (e.g. several
        !            50:  * sockets may be connected to a datagram socket.)  These sockets
        !            51:  * are in a linked list starting with unp_refs, linked through
        !            52:  * unp_nextref and null-terminated.  Note that a socket may be referenced
        !            53:  * by a number of other sockets and may also reference a socket (not
        !            54:  * necessarily one which is referencing it).  This generates
        !            55:  * the need for unp_refs and unp_nextref to be separate fields.
        !            56:  *
        !            57:  * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
        !            58:  * so that changes in the sockbuf may be computed to modify
        !            59:  * back pressure on the sender accordingly.
        !            60:  */
        !            61: struct unpcb {
        !            62:        struct  socket *unp_socket;     /* pointer back to socket */
        !            63:        struct  vnode *unp_vnode;       /* if associated with file */
        !            64:        ino_t   unp_ino;                /* fake inode number */
        !            65:        struct  unpcb *unp_conn;        /* control block of connected socket */
        !            66:        struct  unpcb *unp_refs;        /* referencing socket linked list */
        !            67:        struct  unpcb *unp_nextref;     /* link in unp_refs list */
        !            68:        struct  mbuf *unp_addr;         /* bound address of socket */
        !            69:        int     unp_cc;                 /* copy of rcv.sb_cc */
        !            70:        int     unp_mbcnt;              /* copy of rcv.sb_mbcnt */
        !            71: };
        !            72: 
        !            73: #define        sotounpcb(so)   ((struct unpcb *)((so)->so_pcb))

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