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Annotation of sys/sys/unpcb.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: unpcb.h,v 1.7 2006/11/17 08:33:20 claudio Exp $       */
        !             2: /*     $NetBSD: unpcb.h,v 1.6 1994/06/29 06:46:08 cgd Exp $    */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1982, 1986, 1989, 1993
        !             6:  *     The Regents of the University of California.  All rights reserved.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. Neither the name of the University nor the names of its contributors
        !            17:  *    may be used to endorse or promote products derived from this software
        !            18:  *    without specific prior written permission.
        !            19:  *
        !            20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            30:  * SUCH DAMAGE.
        !            31:  *
        !            32:  *     @(#)unpcb.h     8.1 (Berkeley) 6/2/93
        !            33:  */
        !            34:
        !            35: /*
        !            36:  * Protocol control block for an active
        !            37:  * instance of a UNIX internal protocol.
        !            38:  *
        !            39:  * A socket may be associated with an vnode in the
        !            40:  * file system.  If so, the unp_vnode pointer holds
        !            41:  * a reference count to this vnode, which should be irele'd
        !            42:  * when the socket goes away.
        !            43:  *
        !            44:  * A socket may be connected to another socket, in which
        !            45:  * case the control block of the socket to which it is connected
        !            46:  * is given by unp_conn.
        !            47:  *
        !            48:  * A socket may be referenced by a number of sockets (e.g. several
        !            49:  * sockets may be connected to a datagram socket.)  These sockets
        !            50:  * are in a linked list starting with unp_refs, linked through
        !            51:  * unp_nextref and null-terminated.  Note that a socket may be referenced
        !            52:  * by a number of other sockets and may also reference a socket (not
        !            53:  * necessarily one which is referencing it).  This generates
        !            54:  * the need for unp_refs and unp_nextref to be separate fields.
        !            55:  *
        !            56:  * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
        !            57:  * so that changes in the sockbuf may be computed to modify
        !            58:  * back pressure on the sender accordingly.
        !            59:  */
        !            60: struct unpcbid {
        !            61:        uid_t unp_euid;
        !            62:        gid_t unp_egid;
        !            63: };
        !            64:
        !            65: struct unpcb {
        !            66:        struct  socket *unp_socket;     /* pointer back to socket */
        !            67:        struct  vnode *unp_vnode;       /* if associated with file */
        !            68:        ino_t   unp_ino;                /* fake inode number */
        !            69:        struct  unpcb *unp_conn;        /* control block of connected socket */
        !            70:        struct  unpcb *unp_refs;        /* referencing socket linked list */
        !            71:        struct  unpcb *unp_nextref;     /* link in unp_refs list */
        !            72:        struct  mbuf *unp_addr;         /* bound address of socket */
        !            73:        int     unp_flags;              /* this unpcb contains peer eids */
        !            74:        struct  unpcbid unp_connid;     /* id of peer process */
        !            75:        int     unp_cc;                 /* copy of rcv.sb_cc */
        !            76:        int     unp_mbcnt;              /* copy of rcv.sb_mbcnt */
        !            77:        struct  timespec unp_ctime;     /* holds creation time */
        !            78: };
        !            79:
        !            80: /*
        !            81:  * flag bits in unp_flags
        !            82:  */
        !            83: #define UNP_FEIDS      1               /* unp_connid contains information */
        !            84: #define UNP_FEIDSBIND  2               /* unp_connid was set by a bind */
        !            85:
        !            86: #define        sotounpcb(so)   ((struct unpcb *)((so)->so_pcb))