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Annotation of sys/sys/unpcb.h, Revision 1.1.1.1

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))