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 1.17 2008/04/24 11:38:39 ad 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 #include <sys/un.h>
   38 #include <sys/mutex.h>
   39 
   40 /*
   41  * Protocol control block for an active
   42  * instance of a UNIX internal protocol.
   43  *
   44  * A socket may be associated with an vnode in the
   45  * file system.  If so, the unp_vnode pointer holds
   46  * a reference count to this vnode, which should be irele'd
   47  * when the socket goes away.
   48  *
   49  * A socket may be connected to another socket, in which
   50  * case the control block of the socket to which it is connected
   51  * is given by unp_conn.
   52  *
   53  * A socket may be referenced by a number of sockets (e.g. several
   54  * sockets may be connected to a datagram socket.)  These sockets
   55  * are in a linked list starting with unp_refs, linked through
   56  * unp_nextref and null-terminated.  Note that a socket may be referenced
   57  * by a number of other sockets and may also reference a socket (not
   58  * necessarily one which is referencing it).  This generates
   59  * the need for unp_refs and unp_nextref to be separate fields.
   60  *
   61  * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
   62  * so that changes in the sockbuf may be computed to modify
   63  * back pressure on the sender accordingly.
   64  *
   65  * The unp_ctime holds the creation time of the socket: it might be part of
   66  * a socketpair created by pipe(2), and POSIX requires pipe(2) to initialize
   67  * a stat structure's st_[acm]time members with the pipe's creation time.
   68  * N.B.: updating st_[am]time when reading/writing the pipe is not required,
   69  *       so we just use a single timespec and do not implement that.
   70  */
   71 struct  unpcb {
   72         struct  socket *unp_socket;     /* pointer back to socket */
   73         struct  vnode *unp_vnode;       /* if associated with file */
   74         ino_t   unp_ino;                /* fake inode number */
   75         struct  unpcb *unp_conn;        /* control block of connected socket */
   76         struct  unpcb *unp_refs;        /* referencing socket linked list */
   77         struct  unpcb *unp_nextref;     /* link in unp_refs list */
   78         struct  sockaddr_un *unp_addr;  /* bound address of socket */
   79         kmutex_t *unp_streamlock;       /* lock for est. stream connections */
   80         size_t  unp_addrlen;            /* size of socket address */
   81         int     unp_cc;                 /* copy of rcv.sb_cc */
   82         int     unp_mbcnt;              /* copy of rcv.sb_mbcnt */
   83         struct  timespec unp_ctime;     /* holds creation time */
   84         int     unp_flags;              /* misc flags; see below*/
   85         struct  unpcbid unp_connid;     /* pid and eids of peer */
   86 };
   87 
   88 /*
   89  * Flags in unp_flags.
   90  *
   91  * UNP_EIDSVALID - indicates that the unp_connid member is filled in
   92  * and is really the effective ids of the connected peer.  This is used
   93  * to determine whether the contents should be sent to the user or
   94  * not.
   95  *
   96  * UNP_EIDSBIND - indicates that the unp_connid member is filled
   97  * in with data for the listening process.  This is set up in unp_bind() when
   98  * it fills in unp_connid for later consumption by unp_connect().
   99  */
  100 #define UNP_WANTCRED    0x0001          /* credentials wanted */
  101 #define UNP_CONNWAIT    0x0002          /* connect blocks until accepted */
  102 #define UNP_EIDSVALID   0x0004          /* unp_connid contains valid data */
  103 #define UNP_EIDSBIND    0x0008          /* unp_connid was set by bind() */
  104 #define UNP_BUSY        0x0010          /* busy connecting or binding */
  105 
  106 #define sotounpcb(so)   ((struct unpcb *)((so)->so_pcb))
  107 
  108 #endif /* !_SYS_UNPCB_H_ */

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