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Annotation of 42BSD/sys/h/unpcb.h, revision 1.1

1.1     ! root        1: /*     unpcb.h 6.1     83/07/29        */
        !             2: 
        !             3: /*
        !             4:  * Protocol control block for an active
        !             5:  * instance of a UNIX internal protocol.
        !             6:  *
        !             7:  * A socket may be associated with an inode in the
        !             8:  * file system.  If so, the unp_inode pointer holds
        !             9:  * a reference count to this inode, which should be irele'd
        !            10:  * when the socket goes away.
        !            11:  *
        !            12:  * A socket may be connected to another socket, in which
        !            13:  * case the control block of the socket to which it is connected
        !            14:  * is given by unp_conn.
        !            15:  *
        !            16:  * A socket may be referenced by a number of sockets (e.g. several
        !            17:  * sockets may be connected to a datagram socket.)  These sockets
        !            18:  * are in a linked list starting with unp_refs, linked through
        !            19:  * unp_nextref and null-terminated.  Note that a socket may be referenced
        !            20:  * by a number of other sockets and may also reference a socket (not
        !            21:  * necessarily one which is referencing it).  This generates
        !            22:  * the need for unp_refs and unp_nextref to be separate fields.
        !            23:  */
        !            24: struct unpcb {
        !            25:        struct  socket *unp_socket;     /* pointer back to socket */
        !            26:        struct  inode *unp_inode;       /* if associated with file */
        !            27:        struct  unpcb *unp_conn;        /* control block of connected socket */
        !            28:        struct  unpcb *unp_refs;        /* referencing socket linked list */
        !            29:        struct  unpcb *unp_nextref;     /* link in unp_refs list */
        !            30:        struct  mbuf *unp_remaddr;      /* address of connected socket */
        !            31: };
        !            32: 
        !            33: #define        sotounpcb(so)   ((struct unpcb *)((so)->so_pcb))

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