bsd/sys/unpcb.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1982, 1986, 1989, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  *
  54  *      @(#)unpcb.h     8.1 (Berkeley) 6/2/93
  55  */
  56
  57 #ifndef _SYS_UNPCB_H_
  58 #define _SYS_UNPCB_H_
  59
  60 #include <sys/queue.h>
  61 #include <sys/un.h>
  62
  63 /*
  64  * Protocol control block for an active
  65  * instance of a UNIX internal protocol.
  66  *
  67  * A socket may be associated with an vnode in the
  68  * file system.  If so, the unp_vnode pointer holds
  69  * a reference count to this vnode, which should be irele'd
  70  * when the socket goes away.
  71  *
  72  * A socket may be connected to another socket, in which
  73  * case the control block of the socket to which it is connected
  74  * is given by unp_conn.
  75  *
  76  * A socket may be referenced by a number of sockets (e.g. several
  77  * sockets may be connected to a datagram socket.)  These sockets
  78  * are in a linked list starting with unp_refs, linked through
  79  * unp_nextref and null-terminated.  Note that a socket may be referenced
  80  * by a number of other sockets and may also reference a socket (not
  81  * necessarily one which is referencing it).  This generates
  82  * the need for unp_refs and unp_nextref to be separate fields.
  83  *
  84  * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
  85  * so that changes in the sockbuf may be computed to modify
  86  * back pressure on the sender accordingly.
  87  */
  88 typedef u_quad_t        unp_gen_t;
  89 LIST_HEAD(unp_head, unpcb);
  90
  91 struct  unpcb {
  92         LIST_ENTRY(unpcb) unp_link;     /* glue on list of all PCBs */
  93         struct  socket *unp_socket;     /* pointer back to socket */
  94         struct  vnode *unp_vnode;       /* if associated with file */
  95         ino_t   unp_ino;                /* fake inode number */
  96         struct  unpcb *unp_conn;        /* control block of connected socket */
  97         struct  unp_head unp_refs;      /* referencing socket linked list */
  98         LIST_ENTRY(unpcb) unp_reflink;  /* link in unp_refs list */
  99         struct  sockaddr_un *unp_addr;  /* bound address of socket */
 100         int     unp_cc;                 /* copy of rcv.sb_cc */
 101         int     unp_mbcnt;              /* copy of rcv.sb_mbcnt */
 102         unp_gen_t unp_gencnt;           /* generation count of this instance */
 103 };
 104
 105 #define sotounpcb(so)   ((struct unpcb *)((so)->so_pcb))
 106
 107 /* Hack alert -- this structure depends on <sys/socketvar.h>. */
 108 #ifdef  _SYS_SOCKETVAR_H_
 109 struct  xunpcb {
 110         size_t  xu_len;                 /* length of this structure */
 111         struct  unpcb *xu_unpp;         /* to help netstat, fstat */
 112         struct  unpcb xu_unp;           /* our information */
 113         union {
 114                 struct  sockaddr_un xuu_addr;   /* our bound address */
 115                 char    xu_dummy1[256];
 116         } xu_au;
 117 #define xu_addr xu_au.xuu_addr
 118         union {
 119                 struct  sockaddr_un xuu_caddr; /* their bound address */
 120                 char    xu_dummy2[256];
 121         } xu_cau;
 122 #define xu_caddr xu_cau.xuu_caddr
 123         struct  xsocket xu_socket;
 124         u_quad_t        xu_alignment_hack;
 125 };
 126
 127 struct  xunpgen {
 128         size_t  xug_len;
 129         u_int   xug_count;
 130         unp_gen_t xug_gen;
 131         so_gen_t xug_sogen;
 132 };
 133 #endif /* _SYS_SOCKETVAR_H_ */
 134
 135 #endif /* _SYS_UNPCB_H_ */