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Annotation of Net2/sys/unpcb.h, revision 1.1.1.1

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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