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Annotation of 42BSD/sys/h/unpcb.h, revision 1.1.1.1

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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