Return to unpcb.h CVS log

Up to [CSRG BSD Unix] / 43BSD / sys / h

Annotation of 43BSD/sys/h/unpcb.h, revision 1.1.1.1

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))

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.