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authorRodney W. Grimes <rgrimes@FreeBSD.org>1994-05-24 10:09:53 +0000
committerRodney W. Grimes <rgrimes@FreeBSD.org>1994-05-24 10:09:53 +0000
commitdf8bae1de4b67ccf57f4afebd4e2bf258c38910d (patch)
tree7b1a8eb5b08af4b9f7bac45ad41398687df2c351 /sys/sys/unpcb.h
parent59deaec541ae8baaa58daf6c5a2196ea7de180c3 (diff)
downloadsrc-df8bae1de4b67ccf57f4afebd4e2bf258c38910d.tar.gz
src-df8bae1de4b67ccf57f4afebd4e2bf258c38910d.zip
BSD 4.4 Lite Kernel Sources
Notes
Notes: svn path=/head/; revision=1541
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+/*
+ * Copyright (c) 1982, 1986, 1989, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)unpcb.h 8.1 (Berkeley) 6/2/93
+ */
+
+/*
+ * Protocol control block for an active
+ * instance of a UNIX internal protocol.
+ *
+ * A socket may be associated with an vnode in the
+ * file system. If so, the unp_vnode pointer holds
+ * a reference count to this vnode, which should be irele'd
+ * when the socket goes away.
+ *
+ * A socket may be connected to another socket, in which
+ * case the control block of the socket to which it is connected
+ * is given by unp_conn.
+ *
+ * A socket may be referenced by a number of sockets (e.g. several
+ * sockets may be connected to a datagram socket.) These sockets
+ * are in a linked list starting with unp_refs, linked through
+ * unp_nextref and null-terminated. Note that a socket may be referenced
+ * by a number of other sockets and may also reference a socket (not
+ * necessarily one which is referencing it). This generates
+ * the need for unp_refs and unp_nextref to be separate fields.
+ *
+ * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
+ * so that changes in the sockbuf may be computed to modify
+ * back pressure on the sender accordingly.
+ */
+struct unpcb {
+ struct socket *unp_socket; /* pointer back to socket */
+ struct vnode *unp_vnode; /* if associated with file */
+ ino_t unp_ino; /* fake inode number */
+ struct unpcb *unp_conn; /* control block of connected socket */
+ struct unpcb *unp_refs; /* referencing socket linked list */
+ struct unpcb *unp_nextref; /* link in unp_refs list */
+ struct mbuf *unp_addr; /* bound address of socket */
+ int unp_cc; /* copy of rcv.sb_cc */
+ int unp_mbcnt; /* copy of rcv.sb_mbcnt */
+};
+
+#define sotounpcb(so) ((struct unpcb *)((so)->so_pcb))