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Annotation of 43BSD/sys/h/unpcb.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)unpcb.h     7.1 (Berkeley) 6/4/86
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * Protocol control block for an active
        !            11:  * instance of a UNIX internal protocol.
        !            12:  *
        !            13:  * A socket may be associated with an inode in the
        !            14:  * file system.  If so, the unp_inode pointer holds
        !            15:  * a reference count to this inode, which should be irele'd
        !            16:  * when the socket goes away.
        !            17:  *
        !            18:  * A socket may be connected to another socket, in which
        !            19:  * case the control block of the socket to which it is connected
        !            20:  * is given by unp_conn.
        !            21:  *
        !            22:  * A socket may be referenced by a number of sockets (e.g. several
        !            23:  * sockets may be connected to a datagram socket.)  These sockets
        !            24:  * are in a linked list starting with unp_refs, linked through
        !            25:  * unp_nextref and null-terminated.  Note that a socket may be referenced
        !            26:  * by a number of other sockets and may also reference a socket (not
        !            27:  * necessarily one which is referencing it).  This generates
        !            28:  * the need for unp_refs and unp_nextref to be separate fields.
        !            29:  *
        !            30:  * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
        !            31:  * so that changes in the sockbuf may be computed to modify
        !            32:  * back pressure on the sender accordingly.
        !            33:  */
        !            34: struct unpcb {
        !            35:        struct  socket *unp_socket;     /* pointer back to socket */
        !            36:        struct  inode *unp_inode;       /* if associated with file */
        !            37:        ino_t   unp_ino;                /* fake inode number */
        !            38:        struct  unpcb *unp_conn;        /* control block of connected socket */
        !            39:        struct  unpcb *unp_refs;        /* referencing socket linked list */
        !            40:        struct  unpcb *unp_nextref;     /* link in unp_refs list */
        !            41:        struct  mbuf *unp_addr;         /* bound address of socket */
        !            42:        int     unp_cc;                 /* copy of rcv.sb_cc */
        !            43:        int     unp_mbcnt;              /* copy of rcv.sb_mbcnt */
        !            44: };
        !            45: 
        !            46: #define        sotounpcb(so)   ((struct unpcb *)((so)->so_pcb))

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