The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/unpcb.h

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    1 /*      $NetBSD: unpcb.h,v 1.13 2003/11/29 10:02:42 matt Exp $  */
    2 
    3 /*
    4  * Copyright (c) 1982, 1986, 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)unpcb.h     8.1 (Berkeley) 6/2/93
   32  */
   33 
   34 #ifndef _SYS_UNPCB_H_
   35 #define _SYS_UNPCB_H_
   36 
   37 /*
   38  * Protocol control block for an active
   39  * instance of a UNIX internal protocol.
   40  *
   41  * A socket may be associated with an vnode in the
   42  * file system.  If so, the unp_vnode pointer holds
   43  * a reference count to this vnode, which should be irele'd
   44  * when the socket goes away.
   45  *
   46  * A socket may be connected to another socket, in which
   47  * case the control block of the socket to which it is connected
   48  * is given by unp_conn.
   49  *
   50  * A socket may be referenced by a number of sockets (e.g. several
   51  * sockets may be connected to a datagram socket.)  These sockets
   52  * are in a linked list starting with unp_refs, linked through
   53  * unp_nextref and null-terminated.  Note that a socket may be referenced
   54  * by a number of other sockets and may also reference a socket (not
   55  * necessarily one which is referencing it).  This generates
   56  * the need for unp_refs and unp_nextref to be separate fields.
   57  *
   58  * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
   59  * so that changes in the sockbuf may be computed to modify
   60  * back pressure on the sender accordingly.
   61  *
   62  * The unp_ctime holds the creation time of the socket: it might be part of
   63  * a socketpair created by pipe(2), and POSIX requires pipe(2) to initialize
   64  * a stat structure's st_[acm]time members with the pipe's creation time.
   65  * N.B.: updating st_[am]time when reading/writing the pipe is not required,
   66  *       so we just use a single timespec and do not implement that.
   67  */
   68 struct  unpcb {
   69         struct  socket *unp_socket;     /* pointer back to socket */
   70         struct  vnode *unp_vnode;       /* if associated with file */
   71         ino_t   unp_ino;                /* fake inode number */
   72         struct  unpcb *unp_conn;        /* control block of connected socket */
   73         struct  unpcb *unp_refs;        /* referencing socket linked list */
   74         struct  unpcb *unp_nextref;     /* link in unp_refs list */
   75         struct  sockaddr_un *unp_addr;  /* bound address of socket */
   76         size_t  unp_addrlen;            /* size of socket address */
   77         int     unp_cc;                 /* copy of rcv.sb_cc */
   78         int     unp_mbcnt;              /* copy of rcv.sb_mbcnt */
   79         struct  timespec unp_ctime;     /* holds creation time */
   80         int     unp_flags;              /* misc flags; see below*/
   81 };
   82 
   83 /* unp_flags */
   84 #define UNP_WANTCRED    0x0001          /* credentials wanted */
   85 #define UNP_CONNWAIT    0x0002          /* connect blocks until accepted */
   86 
   87 #define sotounpcb(so)   ((struct unpcb *)((so)->so_pcb))
   88 
   89 #endif /* !_SYS_UNPCB_H_ */

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