UNIX(4): Import from FreeBSD

3 files changed, 2649 insertions, 0 deletions

diff --git a/freebsd/sys/kern/uipc_usrreq.c b/freebsd/sys/kern/uipc_usrreq.c
new file mode 100644
index 00000000..eacfc715
--- /dev/null
+++ b/freebsd/sys/kern/uipc_usrreq.c
@@ -0,0 +1,2643 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * Copyright (c) 1982, 1986, 1989, 1991, 1993
+ *	The Regents of the University of California.
+ * Copyright (c) 2004-2009 Robert N. M. Watson
+ * 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.
+ * 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.
+ *
+ *	From: @(#)uipc_usrreq.c	8.3 (Berkeley) 1/4/94
+ */
+
+/*
+ * UNIX Domain (Local) Sockets
+ *
+ * This is an implementation of UNIX (local) domain sockets.  Each socket has
+ * an associated struct unpcb (UNIX protocol control block).  Stream sockets
+ * may be connected to 0 or 1 other socket.  Datagram sockets may be
+ * connected to 0, 1, or many other sockets.  Sockets may be created and
+ * connected in pairs (socketpair(2)), or bound/connected to using the file
+ * system name space.  For most purposes, only the receive socket buffer is
+ * used, as sending on one socket delivers directly to the receive socket
+ * buffer of a second socket.
+ *
+ * The implementation is substantially complicated by the fact that
+ * "ancillary data", such as file descriptors or credentials, may be passed
+ * across UNIX domain sockets.  The potential for passing UNIX domain sockets
+ * over other UNIX domain sockets requires the implementation of a simple
+ * garbage collector to find and tear down cycles of disconnected sockets.
+ *
+ * TODO:
+ *	RDM
+ *	distinguish datagram size limits from flow control limits in SEQPACKET
+ *	rethink name space problems
+ *	need a proper out-of-band
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <rtems/bsd/local/opt_ddb.h>
+
+#include <rtems/bsd/sys/param.h>
+#include <sys/domain.h>
+#include <sys/fcntl.h>
+#include <sys/malloc.h>		/* XXX must be before <sys/file.h> */
+#include <sys/eventhandler.h>
+#include <sys/file.h>
+#include <sys/filedesc.h>
+#include <sys/kernel.h>
+#include <rtems/bsd/sys/lock.h>
+#include <sys/mbuf.h>
+#include <sys/mount.h>
+#include <sys/mutex.h>
+#include <sys/namei.h>
+#include <sys/proc.h>
+#include <sys/protosw.h>
+#include <sys/queue.h>
+#include <sys/resourcevar.h>
+#include <sys/rwlock.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/signalvar.h>
+#include <sys/stat.h>
+#include <sys/sx.h>
+#include <sys/sysctl.h>
+#include <sys/systm.h>
+#include <sys/taskqueue.h>
+#include <sys/un.h>
+#include <sys/unpcb.h>
+#include <sys/vnode.h>
+
+#include <net/vnet.h>
+
+#ifdef DDB
+#include <ddb/ddb.h>
+#endif
+
+#include <security/mac/mac_framework.h>
+
+#include <vm/uma.h>
+#ifdef __rtems__
+#include <rtems/imfs.h>
+#endif /* __rtems__ */
+
+/*
+ * Locking key:
+ * (l)	Locked using list lock
+ * (g)	Locked using linkage lock
+ */
+
+static uma_zone_t	unp_zone;
+static unp_gen_t	unp_gencnt;	/* (l) */
+static u_int		unp_count;	/* (l) Count of local sockets. */
+static ino_t		unp_ino;	/* Prototype for fake inode numbers. */
+#ifndef __rtems__
+static int		unp_rights;	/* (g) File descriptors in flight. */
+#endif /* __rtems__ */
+static struct unp_head	unp_shead;	/* (l) List of stream sockets. */
+static struct unp_head	unp_dhead;	/* (l) List of datagram sockets. */
+static struct unp_head	unp_sphead;	/* (l) List of seqpacket sockets. */
+
+struct unp_defer {
+	SLIST_ENTRY(unp_defer) ud_link;
+	struct file *ud_fp;
+};
+#ifndef __rtems__
+static SLIST_HEAD(, unp_defer) unp_defers;
+static int unp_defers_count;
+#endif /* __rtems__ */
+
+static const struct sockaddr	sun_noname = { sizeof(sun_noname), AF_LOCAL };
+
+#ifndef __rtems__
+/*
+ * Garbage collection of cyclic file descriptor/socket references occurs
+ * asynchronously in a taskqueue context in order to avoid recursion and
+ * reentrance in the UNIX domain socket, file descriptor, and socket layer
+ * code.  See unp_gc() for a full description.
+ */
+static struct timeout_task unp_gc_task;
+
+/*
+ * The close of unix domain sockets attached as SCM_RIGHTS is
+ * postponed to the taskqueue, to avoid arbitrary recursion depth.
+ * The attached sockets might have another sockets attached.
+ */
+static struct task	unp_defer_task;
+#endif /* __rtems__ */
+
+/*
+ * Both send and receive buffers are allocated PIPSIZ bytes of buffering for
+ * stream sockets, although the total for sender and receiver is actually
+ * only PIPSIZ.
+ *
+ * Datagram sockets really use the sendspace as the maximum datagram size,
+ * and don't really want to reserve the sendspace.  Their recvspace should be
+ * large enough for at least one max-size datagram plus address.
+ */
+#ifndef PIPSIZ
+#define	PIPSIZ	8192
+#endif
+static u_long	unpst_sendspace = PIPSIZ;
+static u_long	unpst_recvspace = PIPSIZ;
+static u_long	unpdg_sendspace = 2*1024;	/* really max datagram size */
+static u_long	unpdg_recvspace = 4*1024;
+static u_long	unpsp_sendspace = PIPSIZ;	/* really max datagram size */
+static u_long	unpsp_recvspace = PIPSIZ;
+
+static SYSCTL_NODE(_net, PF_LOCAL, local, CTLFLAG_RW, 0, "Local domain");
+static SYSCTL_NODE(_net_local, SOCK_STREAM, stream, CTLFLAG_RW, 0,
+    "SOCK_STREAM");
+static SYSCTL_NODE(_net_local, SOCK_DGRAM, dgram, CTLFLAG_RW, 0, "SOCK_DGRAM");
+static SYSCTL_NODE(_net_local, SOCK_SEQPACKET, seqpacket, CTLFLAG_RW, 0,
+    "SOCK_SEQPACKET");
+
+SYSCTL_ULONG(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
+	   &unpst_sendspace, 0, "Default stream send space.");
+SYSCTL_ULONG(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
+	   &unpst_recvspace, 0, "Default stream receive space.");
+SYSCTL_ULONG(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
+	   &unpdg_sendspace, 0, "Default datagram send space.");
+SYSCTL_ULONG(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
+	   &unpdg_recvspace, 0, "Default datagram receive space.");
+SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, maxseqpacket, CTLFLAG_RW,
+	   &unpsp_sendspace, 0, "Default seqpacket send space.");
+SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, recvspace, CTLFLAG_RW,
+	   &unpsp_recvspace, 0, "Default seqpacket receive space.");
+#ifndef __rtems__
+SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0,
+    "File descriptors in flight.");
+SYSCTL_INT(_net_local, OID_AUTO, deferred, CTLFLAG_RD,
+    &unp_defers_count, 0,
+    "File descriptors deferred to taskqueue for close.");
+#endif /* __rtems__ */
+
+/*
+ * Locking and synchronization:
+ *
+ * Three types of locks exit in the local domain socket implementation: a
+ * global list mutex, a global linkage rwlock, and per-unpcb mutexes.  Of the
+ * global locks, the list lock protects the socket count, global generation
+ * number, and stream/datagram global lists.  The linkage lock protects the
+ * interconnection of unpcbs, the v_socket and unp_vnode pointers, and can be
+ * held exclusively over the acquisition of multiple unpcb locks to prevent
+ * deadlock.
+ *
+ * UNIX domain sockets each have an unpcb hung off of their so_pcb pointer,
+ * allocated in pru_attach() and freed in pru_detach().  The validity of that
+ * pointer is an invariant, so no lock is required to dereference the so_pcb
+ * pointer if a valid socket reference is held by the caller.  In practice,
+ * this is always true during operations performed on a socket.  Each unpcb
+ * has a back-pointer to its socket, unp_socket, which will be stable under
+ * the same circumstances.
+ *
+ * This pointer may only be safely dereferenced as long as a valid reference
+ * to the unpcb is held.  Typically, this reference will be from the socket,
+ * or from another unpcb when the referring unpcb's lock is held (in order
+ * that the reference not be invalidated during use).  For example, to follow
+ * unp->unp_conn->unp_socket, you need unlock the lock on unp, not unp_conn,
+ * as unp_socket remains valid as long as the reference to unp_conn is valid.
+ *
+ * Fields of unpcbss are locked using a per-unpcb lock, unp_mtx.  Individual
+ * atomic reads without the lock may be performed "lockless", but more
+ * complex reads and read-modify-writes require the mutex to be held.  No
+ * lock order is defined between unpcb locks -- multiple unpcb locks may be
+ * acquired at the same time only when holding the linkage rwlock
+ * exclusively, which prevents deadlocks.
+ *
+ * Blocking with UNIX domain sockets is a tricky issue: unlike most network
+ * protocols, bind() is a non-atomic operation, and connect() requires
+ * potential sleeping in the protocol, due to potentially waiting on local or
+ * distributed file systems.  We try to separate "lookup" operations, which
+ * may sleep, and the IPC operations themselves, which typically can occur
+ * with relative atomicity as locks can be held over the entire operation.
+ *
+ * Another tricky issue is simultaneous multi-threaded or multi-process
+ * access to a single UNIX domain socket.  These are handled by the flags
+ * UNP_CONNECTING and UNP_BINDING, which prevent concurrent connecting or
+ * binding, both of which involve dropping UNIX domain socket locks in order
+ * to perform namei() and other file system operations.
+ */
+static struct rwlock	unp_link_rwlock;
+static struct mtx	unp_list_lock;
+static struct mtx	unp_defers_lock;
+
+#define	UNP_LINK_LOCK_INIT()		rw_init(&unp_link_rwlock,	\
+					    "unp_link_rwlock")
+
+#define	UNP_LINK_LOCK_ASSERT()	rw_assert(&unp_link_rwlock,	\
+					    RA_LOCKED)
+#define	UNP_LINK_UNLOCK_ASSERT()	rw_assert(&unp_link_rwlock,	\
+					    RA_UNLOCKED)
+
+#define	UNP_LINK_RLOCK()		rw_rlock(&unp_link_rwlock)
+#define	UNP_LINK_RUNLOCK()		rw_runlock(&unp_link_rwlock)
+#define	UNP_LINK_WLOCK()		rw_wlock(&unp_link_rwlock)
+#define	UNP_LINK_WUNLOCK()		rw_wunlock(&unp_link_rwlock)
+#define	UNP_LINK_WLOCK_ASSERT()		rw_assert(&unp_link_rwlock,	\
+					    RA_WLOCKED)
+
+#define	UNP_LIST_LOCK_INIT()		mtx_init(&unp_list_lock,	\
+					    "unp_list_lock", NULL, MTX_DEF)
+#define	UNP_LIST_LOCK()			mtx_lock(&unp_list_lock)
+#define	UNP_LIST_UNLOCK()		mtx_unlock(&unp_list_lock)
+
+#define	UNP_DEFERRED_LOCK_INIT()	mtx_init(&unp_defers_lock, \
+					    "unp_defer", NULL, MTX_DEF)
+#define	UNP_DEFERRED_LOCK()		mtx_lock(&unp_defers_lock)
+#define	UNP_DEFERRED_UNLOCK()		mtx_unlock(&unp_defers_lock)
+
+#define UNP_PCB_LOCK_INIT(unp)		mtx_init(&(unp)->unp_mtx,	\
+					    "unp_mtx", "unp_mtx",	\
+					    MTX_DUPOK|MTX_DEF|MTX_RECURSE)
+#define	UNP_PCB_LOCK_DESTROY(unp)	mtx_destroy(&(unp)->unp_mtx)
+#define	UNP_PCB_LOCK(unp)		mtx_lock(&(unp)->unp_mtx)
+#define	UNP_PCB_UNLOCK(unp)		mtx_unlock(&(unp)->unp_mtx)
+#define	UNP_PCB_LOCK_ASSERT(unp)	mtx_assert(&(unp)->unp_mtx, MA_OWNED)
+
+static int	uipc_connect2(struct socket *, struct socket *);
+static int	uipc_ctloutput(struct socket *, struct sockopt *);
+static int	unp_connect(struct socket *, struct sockaddr *,
+		    struct thread *);
+static int	unp_connect2(struct socket *so, struct socket *so2, int);
+static void	unp_disconnect(struct unpcb *unp, struct unpcb *unp2);
+#ifndef __rtems__
+static void	unp_dispose(struct mbuf *);
+#endif /* __rtems__ */
+static void	unp_shutdown(struct unpcb *);
+static void	unp_drop(struct unpcb *, int);
+#ifndef __rtems__
+static void	unp_gc(__unused void *, int);
+static void	unp_scan(struct mbuf *, void (*)(struct file *));
+static void	unp_discard(struct file *);
+static void	unp_freerights(struct file **, int);
+#endif /* __rtems__ */
+static void	unp_init(void);
+#ifndef __rtems__
+static int	unp_internalize(struct mbuf **, struct thread *);
+static void	unp_internalize_fp(struct file *);
+static int	unp_externalize(struct mbuf *, struct mbuf **);
+static int	unp_externalize_fp(struct file *);
+static struct mbuf	*unp_addsockcred(struct thread *, struct mbuf *);
+static void	unp_process_defers(void * __unused, int);
+#endif /* __rtems__ */
+
+/*
+ * Definitions of protocols supported in the LOCAL domain.
+ */
+static struct domain localdomain;
+static struct pr_usrreqs uipc_usrreqs_dgram, uipc_usrreqs_stream;
+static struct pr_usrreqs uipc_usrreqs_seqpacket;
+static struct protosw localsw[] = {
+{
+	.pr_type =		SOCK_STREAM,
+	.pr_domain =		&localdomain,
+	.pr_flags =		PR_CONNREQUIRED|PR_WANTRCVD|PR_RIGHTS,
+	.pr_ctloutput =		&uipc_ctloutput,
+	.pr_usrreqs =		&uipc_usrreqs_stream
+},
+{
+	.pr_type =		SOCK_DGRAM,
+	.pr_domain =		&localdomain,
+	.pr_flags =		PR_ATOMIC|PR_ADDR|PR_RIGHTS,
+	.pr_ctloutput =		&uipc_ctloutput,
+	.pr_usrreqs =		&uipc_usrreqs_dgram
+},
+{
+	.pr_type =		SOCK_SEQPACKET,
+	.pr_domain =		&localdomain,
+
+	/*
+	 * XXXRW: For now, PR_ADDR because soreceive will bump into them
+	 * due to our use of sbappendaddr.  A new sbappend variants is needed
+	 * that supports both atomic record writes and control data.
+	 */
+	.pr_flags =		PR_ADDR|PR_ATOMIC|PR_CONNREQUIRED|PR_WANTRCVD|
+				    PR_RIGHTS,
+	.pr_usrreqs =		&uipc_usrreqs_seqpacket,
+},
+};
+
+static struct domain localdomain = {
+	.dom_family =		AF_LOCAL,
+	.dom_name =		"local",
+	.dom_init =		unp_init,
+#ifndef __rtems__
+	.dom_externalize =	unp_externalize,
+	.dom_dispose =		unp_dispose,
+#endif /* __rtems__ */
+	.dom_protosw =		localsw,
+	.dom_protoswNPROTOSW =	&localsw[sizeof(localsw)/sizeof(localsw[0])]
+};
+DOMAIN_SET(local);
+
+static void
+uipc_abort(struct socket *so)
+{
+	struct unpcb *unp, *unp2;
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("uipc_abort: unp == NULL"));
+
+	UNP_LINK_WLOCK();
+	UNP_PCB_LOCK(unp);
+	unp2 = unp->unp_conn;
+	if (unp2 != NULL) {
+		UNP_PCB_LOCK(unp2);
+		unp_drop(unp2, ECONNABORTED);
+		UNP_PCB_UNLOCK(unp2);
+	}
+	UNP_PCB_UNLOCK(unp);
+	UNP_LINK_WUNLOCK();
+}
+
+static int
+uipc_accept(struct socket *so, struct sockaddr **nam)
+{
+	struct unpcb *unp, *unp2;
+	const struct sockaddr *sa;
+
+	/*
+	 * Pass back name of connected socket, if it was bound and we are
+	 * still connected (our peer may have closed already!).
+	 */
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("uipc_accept: unp == NULL"));
+
+	*nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
+	UNP_LINK_RLOCK();
+	unp2 = unp->unp_conn;
+	if (unp2 != NULL && unp2->unp_addr != NULL) {
+		UNP_PCB_LOCK(unp2);
+		sa = (struct sockaddr *) unp2->unp_addr;
+		bcopy(sa, *nam, sa->sa_len);
+		UNP_PCB_UNLOCK(unp2);
+	} else {
+		sa = &sun_noname;
+		bcopy(sa, *nam, sa->sa_len);
+	}
+	UNP_LINK_RUNLOCK();
+	return (0);
+}
+
+static int
+uipc_attach(struct socket *so, int proto, struct thread *td)
+{
+	u_long sendspace, recvspace;
+	struct unpcb *unp;
+	int error;
+
+	KASSERT(so->so_pcb == NULL, ("uipc_attach: so_pcb != NULL"));
+	if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
+		switch (so->so_type) {
+		case SOCK_STREAM:
+			sendspace = unpst_sendspace;
+			recvspace = unpst_recvspace;
+			break;
+
+		case SOCK_DGRAM:
+			sendspace = unpdg_sendspace;
+			recvspace = unpdg_recvspace;
+			break;
+
+		case SOCK_SEQPACKET:
+			sendspace = unpsp_sendspace;
+			recvspace = unpsp_recvspace;
+			break;
+
+		default:
+			panic("uipc_attach");
+		}
+		error = soreserve(so, sendspace, recvspace);
+		if (error)
+			return (error);
+	}
+	unp = uma_zalloc(unp_zone, M_NOWAIT | M_ZERO);
+	if (unp == NULL)
+		return (ENOBUFS);
+	LIST_INIT(&unp->unp_refs);
+	UNP_PCB_LOCK_INIT(unp);
+	unp->unp_socket = so;
+	so->so_pcb = unp;
+	unp->unp_refcount = 1;
+
+	UNP_LIST_LOCK();
+	unp->unp_gencnt = ++unp_gencnt;
+	unp_count++;
+	switch (so->so_type) {
+	case SOCK_STREAM:
+		LIST_INSERT_HEAD(&unp_shead, unp, unp_link);
+		break;
+
+	case SOCK_DGRAM:
+		LIST_INSERT_HEAD(&unp_dhead, unp, unp_link);
+		break;
+
+	case SOCK_SEQPACKET:
+		LIST_INSERT_HEAD(&unp_sphead, unp, unp_link);
+		break;
+
+	default:
+		panic("uipc_attach");
+	}
+	UNP_LIST_UNLOCK();
+
+	return (0);
+}
+
+#ifdef __rtems__
+static IMFS_jnode_t *
+rtems_uipc_imfs_initialize(IMFS_jnode_t *node, const IMFS_types_union *info)
+{
+	struct socket *so;
+	struct unpcb *unp;
+
+	node = IMFS_node_initialize_generic(node, info);
+
+	so = IMFS_generic_get_context_by_node(node);
+	unp = sotounpcb(so);
+
+	unp->unp_vnode = node;
+
+	return node;
+}
+
+static IMFS_jnode_t *
+rtems_uipc_imfs_destroy(IMFS_jnode_t *node)
+{
+	struct socket *so;
+	struct unpcb *unp;
+
+	so = IMFS_generic_get_context_by_node(node);
+	unp = sotounpcb(so);
+
+	unp->unp_vnode = NULL;
+
+	return node;
+}
+
+static const IMFS_node_control rtems_uipc_imfs_control = {
+	.imfs_type = IMFS_GENERIC,
+	.handlers = &socketops,
+	.node_initialize = rtems_uipc_imfs_initialize,
+	.node_remove = IMFS_node_remove_default,
+	.node_destroy = rtems_uipc_imfs_destroy
+};
+
+static const IMFS_node_control rtems_uipc_imfs_zombi_control = {
+	.imfs_type = IMFS_GENERIC,
+	.handlers = &rtems_filesystem_handlers_default,
+	.node_initialize = NULL,
+	.node_remove = IMFS_node_remove_default,
+	.node_destroy = IMFS_node_destroy_default
+};
+#endif /* __rtems__ */
+static int
+uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
+{
+	struct sockaddr_un *soun = (struct sockaddr_un *)nam;
+#ifndef __rtems__
+	struct vattr vattr;
+	int error, namelen, vfslocked;
+	struct nameidata nd;
+	struct unpcb *unp;
+	struct vnode *vp;
+	struct mount *mp;
+	char *buf;
+#else /* __rtems__ */
+	int rv;
+	int error, namelen;
+	struct unpcb *unp;
+#endif /* __rtems__ */
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("uipc_bind: unp == NULL"));
+
+	if (soun->sun_len > sizeof(struct sockaddr_un))
+		return (EINVAL);
+	namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
+	if (namelen <= 0)
+		return (EINVAL);
+
+	/*
+	 * We don't allow simultaneous bind() calls on a single UNIX domain
+	 * socket, so flag in-progress operations, and return an error if an
+	 * operation is already in progress.
+	 *
+	 * Historically, we have not allowed a socket to be rebound, so this
+	 * also returns an error.  Not allowing re-binding simplifies the
+	 * implementation and avoids a great many possible failure modes.
+	 */
+	UNP_PCB_LOCK(unp);
+	if (unp->unp_vnode != NULL) {
+		UNP_PCB_UNLOCK(unp);
+		return (EINVAL);
+	}
+	if (unp->unp_flags & UNP_BINDING) {
+		UNP_PCB_UNLOCK(unp);
+		return (EALREADY);
+	}
+	unp->unp_flags |= UNP_BINDING;
+	UNP_PCB_UNLOCK(unp);
+
+#ifndef __rtems__
+	buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
+	bcopy(soun->sun_path, buf, namelen);
+	buf[namelen] = 0;
+
+restart:
+	vfslocked = 0;
+	NDINIT(&nd, CREATE, MPSAFE | NOFOLLOW | LOCKPARENT | SAVENAME,
+	    UIO_SYSSPACE, buf, td);
+/* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
+	error = namei(&nd);
+	if (error)
+		goto error;
+	vp = nd.ni_vp;
+	vfslocked = NDHASGIANT(&nd);
+	if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
+		NDFREE(&nd, NDF_ONLY_PNBUF);
+		if (nd.ni_dvp == vp)
+			vrele(nd.ni_dvp);
+		else
+			vput(nd.ni_dvp);
+		if (vp != NULL) {
+			vrele(vp);
+			error = EADDRINUSE;
+			goto error;
+		}
+		error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
+		if (error)
+			goto error;
+		VFS_UNLOCK_GIANT(vfslocked);
+		goto restart;
+	}
+	VATTR_NULL(&vattr);
+	vattr.va_type = VSOCK;
+	vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
+#ifdef MAC
+	error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
+	    &vattr);
+#endif
+	if (error == 0)
+		error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
+	NDFREE(&nd, NDF_ONLY_PNBUF);
+	vput(nd.ni_dvp);
+	if (error) {
+		vn_finished_write(mp);
+		goto error;
+	}
+	vp = nd.ni_vp;
+	ASSERT_VOP_ELOCKED(vp, "uipc_bind");
+#else /* __rtems__ */
+	soun->sun_path[namelen] = '\0';
+	rv = IMFS_make_generic_node(soun->sun_path,
+	    S_IFSOCK | S_IRWXU | S_IRWXG | S_IRWXO,
+	    &rtems_uipc_imfs_control, so);
+	if (rv != 0) {
+		error = errno;
+		goto error;
+	}
+#endif /* __rtems__ */
+	soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK);
+
+	UNP_LINK_WLOCK();
+	UNP_PCB_LOCK(unp);
+#ifndef __rtems__
+	VOP_UNP_BIND(vp, unp->unp_socket);
+	unp->unp_vnode = vp;
+#endif /* __rtems__ */
+	unp->unp_addr = soun;
+	unp->unp_flags &= ~UNP_BINDING;
+	UNP_PCB_UNLOCK(unp);
+	UNP_LINK_WUNLOCK();
+#ifndef __rtems__
+	VOP_UNLOCK(vp, 0);
+	vn_finished_write(mp);
+	VFS_UNLOCK_GIANT(vfslocked);
+	free(buf, M_TEMP);
+#endif /* __rtems__ */
+	return (0);
+
+error:
+#ifndef __rtems__
+	VFS_UNLOCK_GIANT(vfslocked);
+#endif /* __rtems__ */
+	UNP_PCB_LOCK(unp);
+	unp->unp_flags &= ~UNP_BINDING;
+	UNP_PCB_UNLOCK(unp);
+#ifndef __rtems__
+	free(buf, M_TEMP);
+#endif /* __rtems__ */
+	return (error);
+}
+
+static int
+uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
+{
+	int error;
+
+	KASSERT(td == curthread, ("uipc_connect: td != curthread"));
+	UNP_LINK_WLOCK();
+	error = unp_connect(so, nam, td);
+	UNP_LINK_WUNLOCK();
+	return (error);
+}
+
+static void
+uipc_close(struct socket *so)
+{
+	struct unpcb *unp, *unp2;
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("uipc_close: unp == NULL"));
+
+	UNP_LINK_WLOCK();
+	UNP_PCB_LOCK(unp);
+	unp2 = unp->unp_conn;
+	if (unp2 != NULL) {
+		UNP_PCB_LOCK(unp2);
+		unp_disconnect(unp, unp2);
+		UNP_PCB_UNLOCK(unp2);
+	}
+	UNP_PCB_UNLOCK(unp);
+	UNP_LINK_WUNLOCK();
+}
+
+static int
+uipc_connect2(struct socket *so1, struct socket *so2)
+{
+	struct unpcb *unp, *unp2;
+	int error;
+
+	UNP_LINK_WLOCK();
+	unp = so1->so_pcb;
+	KASSERT(unp != NULL, ("uipc_connect2: unp == NULL"));
+	UNP_PCB_LOCK(unp);
+	unp2 = so2->so_pcb;
+	KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL"));
+	UNP_PCB_LOCK(unp2);
+	error = unp_connect2(so1, so2, PRU_CONNECT2);
+	UNP_PCB_UNLOCK(unp2);
+	UNP_PCB_UNLOCK(unp);
+	UNP_LINK_WUNLOCK();
+	return (error);
+}
+
+static void
+uipc_detach(struct socket *so)
+{
+	struct unpcb *unp, *unp2;
+	struct sockaddr_un *saved_unp_addr;
+#ifndef __rtems__
+	struct vnode *vp;
+	int freeunp, local_unp_rights;
+#else /* __rtems__ */
+	struct IMFS_jnode_tt *vp;
+	int freeunp;
+#endif /* __rtems__ */
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("uipc_detach: unp == NULL"));
+
+	UNP_LINK_WLOCK();
+	UNP_LIST_LOCK();
+	UNP_PCB_LOCK(unp);
+	LIST_REMOVE(unp, unp_link);
+	unp->unp_gencnt = ++unp_gencnt;
+	--unp_count;
+	UNP_LIST_UNLOCK();
+
+	/*
+	 * XXXRW: Should assert vp->v_socket == so.
+	 */
+	if ((vp = unp->unp_vnode) != NULL) {
+#ifndef __rtems__
+		VOP_UNP_DETACH(vp);
+#else /* __rtems__ */
+		vp->control = &rtems_uipc_imfs_zombi_control;
+		vp->info.generic.context = NULL;
+#endif /* __rtems__ */
+		unp->unp_vnode = NULL;
+	}
+	unp2 = unp->unp_conn;
+	if (unp2 != NULL) {
+		UNP_PCB_LOCK(unp2);
+		unp_disconnect(unp, unp2);
+		UNP_PCB_UNLOCK(unp2);
+	}
+
+	/*
+	 * We hold the linkage lock exclusively, so it's OK to acquire
+	 * multiple pcb locks at a time.
+	 */
+	while (!LIST_EMPTY(&unp->unp_refs)) {
+		struct unpcb *ref = LIST_FIRST(&unp->unp_refs);
+
+		UNP_PCB_LOCK(ref);
+		unp_drop(ref, ECONNRESET);
+		UNP_PCB_UNLOCK(ref);
+	}
+#ifndef __rtems__
+	local_unp_rights = unp_rights;
+#endif /* __rtems__ */
+	UNP_LINK_WUNLOCK();
+	unp->unp_socket->so_pcb = NULL;
+	saved_unp_addr = unp->unp_addr;
+	unp->unp_addr = NULL;
+	unp->unp_refcount--;
+	freeunp = (unp->unp_refcount == 0);
+	if (saved_unp_addr != NULL)
+		free(saved_unp_addr, M_SONAME);
+	if (freeunp) {
+		UNP_PCB_LOCK_DESTROY(unp);
+		uma_zfree(unp_zone, unp);
+	} else
+		UNP_PCB_UNLOCK(unp);
+#ifndef __rtems__
+	if (vp) {
+		int vfslocked;
+
+		vfslocked = VFS_LOCK_GIANT(vp->v_mount);
+		vrele(vp);
+		VFS_UNLOCK_GIANT(vfslocked);
+	}
+	if (local_unp_rights)
+		taskqueue_enqueue_timeout(taskqueue_thread, &unp_gc_task, -1);
+#endif /* __rtems__ */
+}
+
+static int
+uipc_disconnect(struct socket *so)
+{
+	struct unpcb *unp, *unp2;
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL"));
+
+	UNP_LINK_WLOCK();
+	UNP_PCB_LOCK(unp);
+	unp2 = unp->unp_conn;
+	if (unp2 != NULL) {
+		UNP_PCB_LOCK(unp2);
+		unp_disconnect(unp, unp2);
+		UNP_PCB_UNLOCK(unp2);
+	}
+	UNP_PCB_UNLOCK(unp);
+	UNP_LINK_WUNLOCK();
+	return (0);
+}
+
+static int
+uipc_listen(struct socket *so, int backlog, struct thread *td)
+{
+	struct unpcb *unp;
+	int error;
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("uipc_listen: unp == NULL"));
+
+	UNP_PCB_LOCK(unp);
+	if (unp->unp_vnode == NULL) {
+		UNP_PCB_UNLOCK(unp);
+		return (EINVAL);
+	}
+
+	SOCK_LOCK(so);
+	error = solisten_proto_check(so);
+	if (error == 0) {
+		cru2x(td->td_ucred, &unp->unp_peercred);
+		unp->unp_flags |= UNP_HAVEPCCACHED;
+		solisten_proto(so, backlog);
+	}
+	SOCK_UNLOCK(so);
+	UNP_PCB_UNLOCK(unp);
+	return (error);
+}
+
+static int
+uipc_peeraddr(struct socket *so, struct sockaddr **nam)
+{
+	struct unpcb *unp, *unp2;
+	const struct sockaddr *sa;
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("uipc_peeraddr: unp == NULL"));
+
+	*nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
+	UNP_LINK_RLOCK();
+	/*
+	 * XXX: It seems that this test always fails even when connection is
+	 * established.  So, this else clause is added as workaround to
+	 * return PF_LOCAL sockaddr.
+	 */
+	unp2 = unp->unp_conn;
+	if (unp2 != NULL) {
+		UNP_PCB_LOCK(unp2);
+		if (unp2->unp_addr != NULL)
+			sa = (struct sockaddr *) unp2->unp_addr;
+		else
+			sa = &sun_noname;
+		bcopy(sa, *nam, sa->sa_len);
+		UNP_PCB_UNLOCK(unp2);
+	} else {
+		sa = &sun_noname;
+		bcopy(sa, *nam, sa->sa_len);
+	}
+	UNP_LINK_RUNLOCK();
+	return (0);
+}
+
+static int
+uipc_rcvd(struct socket *so, int flags)
+{
+	struct unpcb *unp, *unp2;
+	struct socket *so2;
+	u_int mbcnt, sbcc;
+	u_long newhiwat;
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("uipc_rcvd: unp == NULL"));
+
+	if (so->so_type != SOCK_STREAM && so->so_type != SOCK_SEQPACKET)
+		panic("uipc_rcvd socktype %d", so->so_type);
+
+	/*
+	 * Adjust backpressure on sender and wakeup any waiting to write.
+	 *
+	 * The unp lock is acquired to maintain the validity of the unp_conn
+	 * pointer; no lock on unp2 is required as unp2->unp_socket will be
+	 * static as long as we don't permit unp2 to disconnect from unp,
+	 * which is prevented by the lock on unp.  We cache values from
+	 * so_rcv to avoid holding the so_rcv lock over the entire
+	 * transaction on the remote so_snd.
+	 */
+	SOCKBUF_LOCK(&so->so_rcv);
+	mbcnt = so->so_rcv.sb_mbcnt;
+	sbcc = so->so_rcv.sb_cc;
+	SOCKBUF_UNLOCK(&so->so_rcv);
+	UNP_PCB_LOCK(unp);
+	unp2 = unp->unp_conn;
+	if (unp2 == NULL) {
+		UNP_PCB_UNLOCK(unp);
+		return (0);
+	}
+	so2 = unp2->unp_socket;
+	SOCKBUF_LOCK(&so2->so_snd);
+	so2->so_snd.sb_mbmax += unp->unp_mbcnt - mbcnt;
+	newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc - sbcc;
+	(void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat,
+	    newhiwat, RLIM_INFINITY);
+	sowwakeup_locked(so2);
+	unp->unp_mbcnt = mbcnt;
+	unp->unp_cc = sbcc;
+	UNP_PCB_UNLOCK(unp);
+	return (0);
+}
+
+static int
+uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
+    struct mbuf *control, struct thread *td)
+{
+	struct unpcb *unp, *unp2;
+	struct socket *so2;
+	u_int mbcnt_delta, sbcc;
+	u_int newhiwat;
+	int error = 0;
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("uipc_send: unp == NULL"));
+
+	if (flags & PRUS_OOB) {
+		error = EOPNOTSUPP;
+		goto release;
+	}
+#ifndef __rtems__
+	if (control != NULL && (error = unp_internalize(&control, td)))
+		goto release;
+#else /* __rtems__ */
+	if (control != NULL) {
+		error = ENOSYS;
+		goto release;
+	}
+#endif /* __rtems__ */
+	if ((nam != NULL) || (flags & PRUS_EOF))
+		UNP_LINK_WLOCK();
+	else
+		UNP_LINK_RLOCK();
+	switch (so->so_type) {
+	case SOCK_DGRAM:
+	{
+		const struct sockaddr *from;
+
+		unp2 = unp->unp_conn;
+		if (nam != NULL) {
+			UNP_LINK_WLOCK_ASSERT();
+			if (unp2 != NULL) {
+				error = EISCONN;
+				break;
+			}
+			error = unp_connect(so, nam, td);
+			if (error)
+				break;
+			unp2 = unp->unp_conn;
+		}
+
+		/*
+		 * Because connect() and send() are non-atomic in a sendto()
+		 * with a target address, it's possible that the socket will
+		 * have disconnected before the send() can run.  In that case
+		 * return the slightly counter-intuitive but otherwise
+		 * correct error that the socket is not connected.
+		 */
+		if (unp2 == NULL) {
+			error = ENOTCONN;
+			break;
+		}
+		/* Lockless read. */
+		if (unp2->unp_flags & UNP_WANTCRED)
+#ifndef __rtems__
+			control = unp_addsockcred(td, control);
+#else /* __rtems__ */
+			control = NULL;
+#endif /* __rtems__ */
+		UNP_PCB_LOCK(unp);
+		if (unp->unp_addr != NULL)
+			from = (struct sockaddr *)unp->unp_addr;
+		else
+			from = &sun_noname;
+		so2 = unp2->unp_socket;
+		SOCKBUF_LOCK(&so2->so_rcv);
+		if (sbappendaddr_locked(&so2->so_rcv, from, m, control)) {
+			sorwakeup_locked(so2);
+			m = NULL;
+			control = NULL;
+		} else {
+			SOCKBUF_UNLOCK(&so2->so_rcv);
+			error = ENOBUFS;
+		}
+		if (nam != NULL) {
+			UNP_LINK_WLOCK_ASSERT();
+			UNP_PCB_LOCK(unp2);
+			unp_disconnect(unp, unp2);
+			UNP_PCB_UNLOCK(unp2);
+		}
+		UNP_PCB_UNLOCK(unp);
+		break;
+	}
+
+	case SOCK_SEQPACKET:
+	case SOCK_STREAM:
+		if ((so->so_state & SS_ISCONNECTED) == 0) {
+			if (nam != NULL) {
+				UNP_LINK_WLOCK_ASSERT();
+				error = unp_connect(so, nam, td);
+				if (error)
+					break;	/* XXX */
+			} else {
+				error = ENOTCONN;
+				break;
+			}
+		}
+
+		/* Lockless read. */
+		if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
+			error = EPIPE;
+			break;
+		}
+
+		/*
+		 * Because connect() and send() are non-atomic in a sendto()
+		 * with a target address, it's possible that the socket will
+		 * have disconnected before the send() can run.  In that case
+		 * return the slightly counter-intuitive but otherwise
+		 * correct error that the socket is not connected.
+		 *
+		 * Locking here must be done carefully: the linkage lock
+		 * prevents interconnections between unpcbs from changing, so
+		 * we can traverse from unp to unp2 without acquiring unp's
+		 * lock.  Socket buffer locks follow unpcb locks, so we can
+		 * acquire both remote and lock socket buffer locks.
+		 */
+		unp2 = unp->unp_conn;
+		if (unp2 == NULL) {
+			error = ENOTCONN;
+			break;
+		}
+		so2 = unp2->unp_socket;
+		UNP_PCB_LOCK(unp2);
+		SOCKBUF_LOCK(&so2->so_rcv);
+		if (unp2->unp_flags & UNP_WANTCRED) {
+#ifndef __rtems__
+			/*
+			 * Credentials are passed only once on SOCK_STREAM.
+			 */
+			unp2->unp_flags &= ~UNP_WANTCRED;
+			control = unp_addsockcred(td, control);
+#endif /* __rtems__ */
+		}
+		/*
+		 * Send to paired receive port, and then reduce send buffer
+		 * hiwater marks to maintain backpressure.  Wake up readers.
+		 */
+		switch (so->so_type) {
+		case SOCK_STREAM:
+			if (control != NULL) {
+				if (sbappendcontrol_locked(&so2->so_rcv, m,
+				    control))
+					control = NULL;
+			} else
+				sbappend_locked(&so2->so_rcv, m);
+			break;
+
+		case SOCK_SEQPACKET: {
+			const struct sockaddr *from;
+
+			from = &sun_noname;
+			if (sbappendaddr_locked(&so2->so_rcv, from, m,
+			    control))
+				control = NULL;
+			break;
+			}
+		}
+
+		/*
+		 * XXXRW: While fine for SOCK_STREAM, this conflates maximum
+		 * datagram size and back-pressure for SOCK_SEQPACKET, which
+		 * can lead to undesired return of EMSGSIZE on send instead
+		 * of more desirable blocking.
+		 */
+		mbcnt_delta = so2->so_rcv.sb_mbcnt - unp2->unp_mbcnt;
+		unp2->unp_mbcnt = so2->so_rcv.sb_mbcnt;
+		sbcc = so2->so_rcv.sb_cc;
+		sorwakeup_locked(so2);
+
+		SOCKBUF_LOCK(&so->so_snd);
+		if ((int)so->so_snd.sb_hiwat >= (int)(sbcc - unp2->unp_cc))
+			newhiwat = so->so_snd.sb_hiwat - (sbcc - unp2->unp_cc);
+		else
+			newhiwat = 0;
+		(void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat,
+		    newhiwat, RLIM_INFINITY);
+		so->so_snd.sb_mbmax -= mbcnt_delta;
+		SOCKBUF_UNLOCK(&so->so_snd);
+		unp2->unp_cc = sbcc;
+		UNP_PCB_UNLOCK(unp2);
+		m = NULL;
+		break;
+
+	default:
+		panic("uipc_send unknown socktype");
+	}
+
+	/*
+	 * PRUS_EOF is equivalent to pru_send followed by pru_shutdown.
+	 */
+	if (flags & PRUS_EOF) {
+		UNP_PCB_LOCK(unp);
+		socantsendmore(so);
+		unp_shutdown(unp);
+		UNP_PCB_UNLOCK(unp);
+	}
+
+	if ((nam != NULL) || (flags & PRUS_EOF))
+		UNP_LINK_WUNLOCK();
+	else
+		UNP_LINK_RUNLOCK();
+
+	if (control != NULL && error != 0)
+#ifndef __rtems__
+		unp_dispose(control);
+#else /* __rtems__ */
+		BSD_ASSERT(0);
+#endif /* __rtems__ */
+
+release:
+	if (control != NULL)
+		m_freem(control);
+	if (m != NULL)
+		m_freem(m);
+	return (error);
+}
+
+static int
+uipc_sense(struct socket *so, struct stat *sb)
+{
+	struct unpcb *unp, *unp2;
+	struct socket *so2;
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("uipc_sense: unp == NULL"));
+
+	sb->st_blksize = so->so_snd.sb_hiwat;
+	UNP_LINK_RLOCK();
+	UNP_PCB_LOCK(unp);
+	unp2 = unp->unp_conn;
+	if ((so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET) &&
+	    unp2 != NULL) {
+		so2 = unp2->unp_socket;
+		sb->st_blksize += so2->so_rcv.sb_cc;
+	}
+	sb->st_dev = NODEV;
+	if (unp->unp_ino == 0)
+		unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
+	sb->st_ino = unp->unp_ino;
+	UNP_PCB_UNLOCK(unp);
+	UNP_LINK_RUNLOCK();
+	return (0);
+}
+
+static int
+uipc_shutdown(struct socket *so)
+{
+	struct unpcb *unp;
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
+
+	UNP_LINK_WLOCK();
+	UNP_PCB_LOCK(unp);
+	socantsendmore(so);
+	unp_shutdown(unp);
+	UNP_PCB_UNLOCK(unp);
+	UNP_LINK_WUNLOCK();
+	return (0);
+}
+
+static int
+uipc_sockaddr(struct socket *so, struct sockaddr **nam)
+{
+	struct unpcb *unp;
+	const struct sockaddr *sa;
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL"));
+
+	*nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
+	UNP_PCB_LOCK(unp);
+	if (unp->unp_addr != NULL)
+		sa = (struct sockaddr *) unp->unp_addr;
+	else
+		sa = &sun_noname;
+	bcopy(sa, *nam, sa->sa_len);
+	UNP_PCB_UNLOCK(unp);
+	return (0);
+}
+
+static struct pr_usrreqs uipc_usrreqs_dgram = {
+	.pru_abort = 		uipc_abort,
+	.pru_accept =		uipc_accept,
+	.pru_attach =		uipc_attach,
+	.pru_bind =		uipc_bind,
+	.pru_connect =		uipc_connect,
+	.pru_connect2 =		uipc_connect2,
+	.pru_detach =		uipc_detach,
+	.pru_disconnect =	uipc_disconnect,
+	.pru_listen =		uipc_listen,
+	.pru_peeraddr =		uipc_peeraddr,
+	.pru_rcvd =		uipc_rcvd,
+	.pru_send =		uipc_send,
+	.pru_sense =		uipc_sense,
+	.pru_shutdown =		uipc_shutdown,
+	.pru_sockaddr =		uipc_sockaddr,
+	.pru_soreceive =	soreceive_dgram,
+	.pru_close =		uipc_close,
+};
+
+static struct pr_usrreqs uipc_usrreqs_seqpacket = {
+	.pru_abort =		uipc_abort,
+	.pru_accept =		uipc_accept,
+	.pru_attach =		uipc_attach,
+	.pru_bind =		uipc_bind,
+	.pru_connect =		uipc_connect,
+	.pru_connect2 =		uipc_connect2,
+	.pru_detach =		uipc_detach,
+	.pru_disconnect =	uipc_disconnect,
+	.pru_listen =		uipc_listen,
+	.pru_peeraddr =		uipc_peeraddr,
+	.pru_rcvd =		uipc_rcvd,
+	.pru_send =		uipc_send,
+	.pru_sense =		uipc_sense,
+	.pru_shutdown =		uipc_shutdown,
+	.pru_sockaddr =		uipc_sockaddr,
+	.pru_soreceive =	soreceive_generic,	/* XXX: or...? */
+	.pru_close =		uipc_close,
+};
+
+static struct pr_usrreqs uipc_usrreqs_stream = {
+	.pru_abort = 		uipc_abort,
+	.pru_accept =		uipc_accept,
+	.pru_attach =		uipc_attach,
+	.pru_bind =		uipc_bind,
+	.pru_connect =		uipc_connect,
+	.pru_connect2 =		uipc_connect2,
+	.pru_detach =		uipc_detach,
+	.pru_disconnect =	uipc_disconnect,
+	.pru_listen =		uipc_listen,
+	.pru_peeraddr =		uipc_peeraddr,
+	.pru_rcvd =		uipc_rcvd,
+	.pru_send =		uipc_send,
+	.pru_sense =		uipc_sense,
+	.pru_shutdown =		uipc_shutdown,
+	.pru_sockaddr =		uipc_sockaddr,
+	.pru_soreceive =	soreceive_generic,
+	.pru_close =		uipc_close,
+};
+
+static int
+uipc_ctloutput(struct socket *so, struct sockopt *sopt)
+{
+	struct unpcb *unp;
+	struct xucred xu;
+	int error, optval;
+
+	if (sopt->sopt_level != 0)
+		return (EINVAL);
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL"));
+	error = 0;
+	switch (sopt->sopt_dir) {
+	case SOPT_GET:
+		switch (sopt->sopt_name) {
+		case LOCAL_PEERCRED:
+			UNP_PCB_LOCK(unp);
+			if (unp->unp_flags & UNP_HAVEPC)
+				xu = unp->unp_peercred;
+			else {
+				if (so->so_type == SOCK_STREAM)
+					error = ENOTCONN;
+				else
+					error = EINVAL;
+			}
+			UNP_PCB_UNLOCK(unp);
+			if (error == 0)
+				error = sooptcopyout(sopt, &xu, sizeof(xu));
+			break;
+
+		case LOCAL_CREDS:
+			/* Unlocked read. */
+			optval = unp->unp_flags & UNP_WANTCRED ? 1 : 0;
+			error = sooptcopyout(sopt, &optval, sizeof(optval));
+			break;
+
+		case LOCAL_CONNWAIT:
+			/* Unlocked read. */
+			optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0;
+			error = sooptcopyout(sopt, &optval, sizeof(optval));
+			break;
+
+		default:
+			error = EOPNOTSUPP;
+			break;
+		}
+		break;
+
+	case SOPT_SET:
+		switch (sopt->sopt_name) {
+		case LOCAL_CREDS:
+		case LOCAL_CONNWAIT:
+			error = sooptcopyin(sopt, &optval, sizeof(optval),
+					    sizeof(optval));
+			if (error)
+				break;
+
+#define	OPTSET(bit) do {						\
+	UNP_PCB_LOCK(unp);						\
+	if (optval)							\
+		unp->unp_flags |= bit;					\
+	else								\
+		unp->unp_flags &= ~bit;					\
+	UNP_PCB_UNLOCK(unp);						\
+} while (0)
+
+			switch (sopt->sopt_name) {
+			case LOCAL_CREDS:
+				OPTSET(UNP_WANTCRED);
+				break;
+
+			case LOCAL_CONNWAIT:
+				OPTSET(UNP_CONNWAIT);
+				break;
+
+			default:
+				break;
+			}
+			break;
+#undef	OPTSET
+		default:
+			error = ENOPROTOOPT;
+			break;
+		}
+		break;
+
+	default:
+		error = EOPNOTSUPP;
+		break;
+	}
+	return (error);
+}
+
+static int
+unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
+{
+	struct sockaddr_un *soun = (struct sockaddr_un *)nam;
+#ifndef __rtems__
+	struct vnode *vp;
+#else /* __rtems__ */
+	struct IMFS_jnode_tt *vp;
+#endif /* __rtems__ */
+	struct socket *so2, *so3;
+	struct unpcb *unp, *unp2, *unp3;
+#ifndef __rtems__
+	int error, len, vfslocked;
+	struct nameidata nd;
+	char buf[SOCK_MAXADDRLEN];
+#else /* __rtems__ */
+	int error, len;
+	rtems_filesystem_eval_path_context_t ctx;
+	int eval_flags;
+	const rtems_filesystem_location_info_t *currentloc;
+#endif /* __rtems__ */
+	struct sockaddr *sa;
+
+	UNP_LINK_WLOCK_ASSERT();
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
+
+	if (nam->sa_len > sizeof(struct sockaddr_un))
+		return (EINVAL);
+	len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
+	if (len <= 0)
+		return (EINVAL);
+#ifndef __rtems__
+	bcopy(soun->sun_path, buf, len);
+	buf[len] = 0;
+#endif /* __rtems__ */
+
+	UNP_PCB_LOCK(unp);
+	if (unp->unp_flags & UNP_CONNECTING) {
+		UNP_PCB_UNLOCK(unp);
+		return (EALREADY);
+	}
+	UNP_LINK_WUNLOCK();
+	unp->unp_flags |= UNP_CONNECTING;
+	UNP_PCB_UNLOCK(unp);
+
+	sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
+#ifndef __rtems__
+	NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW | LOCKSHARED | LOCKLEAF,
+	    UIO_SYSSPACE, buf, td);
+	error = namei(&nd);
+	if (error)
+		vp = NULL;
+	else
+		vp = nd.ni_vp;
+	ASSERT_VOP_LOCKED(vp, "unp_connect");
+	vfslocked = NDHASGIANT(&nd);
+	NDFREE(&nd, NDF_ONLY_PNBUF);
+	if (error)
+		goto bad;
+
+	if (vp->v_type != VSOCK) {
+		error = ENOTSOCK;
+		goto bad;
+	}
+#ifdef MAC
+	error = mac_vnode_check_open(td->td_ucred, vp, VWRITE | VREAD);
+	if (error)
+		goto bad;
+#endif
+	error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
+	if (error)
+		goto bad;
+	VFS_UNLOCK_GIANT(vfslocked);
+#else /* __rtems__ */
+	soun->sun_path[len] = '\0';
+	eval_flags = RTEMS_FS_FOLLOW_LINK;
+	currentloc = rtems_filesystem_eval_path_start(&ctx,
+	    &soun->sun_path[0], eval_flags);
+
+	if (currentloc->handlers == &socketops) {
+		vp = currentloc->node_access;
+	} else {
+		vp = NULL;
+	}
+
+	rtems_filesystem_eval_path_cleanup(&ctx);
+
+	if (vp == NULL) {
+		error = ENOTSOCK;
+		goto bad;
+	}
+#endif /* __rtems__ */
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
+
+	/*
+	 * Lock linkage lock for two reasons: make sure v_socket is stable,
+	 * and to protect simultaneous locking of multiple pcbs.
+	 */
+	UNP_LINK_WLOCK();
+#ifndef __rtems__
+	VOP_UNP_CONNECT(vp, &so2);
+#else /* __rtems__ */
+	so2 = IMFS_generic_get_context_by_node(vp);
+#endif /* __rtems__ */
+	if (so2 == NULL) {
+		error = ECONNREFUSED;
+		goto bad2;
+	}
+	if (so->so_type != so2->so_type) {
+		error = EPROTOTYPE;
+		goto bad2;
+	}
+	if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
+		if (so2->so_options & SO_ACCEPTCONN) {
+			CURVNET_SET(so2->so_vnet);
+			so3 = sonewconn(so2, 0);
+			CURVNET_RESTORE();
+		} else
+			so3 = NULL;
+		if (so3 == NULL) {
+			error = ECONNREFUSED;
+			goto bad2;
+		}
+		unp = sotounpcb(so);
+		unp2 = sotounpcb(so2);
+		unp3 = sotounpcb(so3);
+		UNP_PCB_LOCK(unp);
+		UNP_PCB_LOCK(unp2);
+		UNP_PCB_LOCK(unp3);
+		if (unp2->unp_addr != NULL) {
+			bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len);
+			unp3->unp_addr = (struct sockaddr_un *) sa;
+			sa = NULL;
+		}
+
+		/*
+		 * The connecter's (client's) credentials are copied from its
+		 * process structure at the time of connect() (which is now).
+		 */
+		cru2x(td->td_ucred, &unp3->unp_peercred);
+		unp3->unp_flags |= UNP_HAVEPC;
+
+		/*
+		 * The receiver's (server's) credentials are copied from the
+		 * unp_peercred member of socket on which the former called
+		 * listen(); uipc_listen() cached that process's credentials
+		 * at that time so we can use them now.
+		 */
+		KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
+		    ("unp_connect: listener without cached peercred"));
+		memcpy(&unp->unp_peercred, &unp2->unp_peercred,
+		    sizeof(unp->unp_peercred));
+		unp->unp_flags |= UNP_HAVEPC;
+		if (unp2->unp_flags & UNP_WANTCRED)
+			unp3->unp_flags |= UNP_WANTCRED;
+		UNP_PCB_UNLOCK(unp3);
+		UNP_PCB_UNLOCK(unp2);
+		UNP_PCB_UNLOCK(unp);
+#ifdef MAC
+		mac_socketpeer_set_from_socket(so, so3);
+		mac_socketpeer_set_from_socket(so3, so);
+#endif
+
+		so2 = so3;
+	}
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
+	unp2 = sotounpcb(so2);
+	KASSERT(unp2 != NULL, ("unp_connect: unp2 == NULL"));
+	UNP_PCB_LOCK(unp);
+	UNP_PCB_LOCK(unp2);
+	error = unp_connect2(so, so2, PRU_CONNECT);
+	UNP_PCB_UNLOCK(unp2);
+	UNP_PCB_UNLOCK(unp);
+bad2:
+	UNP_LINK_WUNLOCK();
+#ifndef __rtems__
+	if (vfslocked)
+		/* 
+		 * Giant has been previously acquired. This means filesystem
+		 * isn't MPSAFE.  Do it once again.
+		 */
+		mtx_lock(&Giant);
+#endif /* __rtems__ */
+bad:
+#ifndef __rtems__
+	if (vp != NULL)
+		vput(vp);
+	VFS_UNLOCK_GIANT(vfslocked);
+#endif /* __rtems__ */
+	free(sa, M_SONAME);
+	UNP_LINK_WLOCK();
+	UNP_PCB_LOCK(unp);
+	unp->unp_flags &= ~UNP_CONNECTING;
+	UNP_PCB_UNLOCK(unp);
+	return (error);
+}
+
+static int
+unp_connect2(struct socket *so, struct socket *so2, int req)
+{
+	struct unpcb *unp;
+	struct unpcb *unp2;
+
+	unp = sotounpcb(so);
+	KASSERT(unp != NULL, ("unp_connect2: unp == NULL"));
+	unp2 = sotounpcb(so2);
+	KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL"));
+
+	UNP_LINK_WLOCK_ASSERT();
+	UNP_PCB_LOCK_ASSERT(unp);
+	UNP_PCB_LOCK_ASSERT(unp2);
+
+	if (so2->so_type != so->so_type)
+		return (EPROTOTYPE);
+	unp->unp_conn = unp2;
+
+	switch (so->so_type) {
+	case SOCK_DGRAM:
+		LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
+		soisconnected(so);
+		break;
+
+	case SOCK_STREAM:
+	case SOCK_SEQPACKET:
+		unp2->unp_conn = unp;
+		if (req == PRU_CONNECT &&
+		    ((unp->unp_flags | unp2->unp_flags) & UNP_CONNWAIT))
+			soisconnecting(so);
+		else
+			soisconnected(so);
+		soisconnected(so2);
+		break;
+
+	default:
+		panic("unp_connect2");
+	}
+	return (0);
+}
+
+static void
+unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
+{
+	struct socket *so;
+
+	KASSERT(unp2 != NULL, ("unp_disconnect: unp2 == NULL"));
+
+	UNP_LINK_WLOCK_ASSERT();
+	UNP_PCB_LOCK_ASSERT(unp);
+	UNP_PCB_LOCK_ASSERT(unp2);
+
+	unp->unp_conn = NULL;
+	switch (unp->unp_socket->so_type) {
+	case SOCK_DGRAM:
+		LIST_REMOVE(unp, unp_reflink);
+		so = unp->unp_socket;
+		SOCK_LOCK(so);
+		so->so_state &= ~SS_ISCONNECTED;
+		SOCK_UNLOCK(so);
+		break;
+
+	case SOCK_STREAM:
+	case SOCK_SEQPACKET:
+		soisdisconnected(unp->unp_socket);
+		unp2->unp_conn = NULL;
+		soisdisconnected(unp2->unp_socket);
+		break;
+	}
+}
+
+/*
+ * unp_pcblist() walks the global list of struct unpcb's to generate a
+ * pointer list, bumping the refcount on each unpcb.  It then copies them out
+ * sequentially, validating the generation number on each to see if it has
+ * been detached.  All of this is necessary because copyout() may sleep on
+ * disk I/O.
+ */
+static int
+unp_pcblist(SYSCTL_HANDLER_ARGS)
+{
+	int error, i, n;
+	int freeunp;
+	struct unpcb *unp, **unp_list;
+	unp_gen_t gencnt;
+	struct xunpgen *xug;
+	struct unp_head *head;
+	struct xunpcb *xu;
+
+	switch ((intptr_t)arg1) {
+	case SOCK_STREAM:
+		head = &unp_shead;
+		break;
+
+	case SOCK_DGRAM:
+		head = &unp_dhead;
+		break;
+
+	case SOCK_SEQPACKET:
+		head = &unp_sphead;
+		break;
+
+	default:
+		panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1);
+	}
+
+	/*
+	 * The process of preparing the PCB list is too time-consuming and
+	 * resource-intensive to repeat twice on every request.
+	 */
+	if (req->oldptr == NULL) {
+		n = unp_count;
+		req->oldidx = 2 * (sizeof *xug)
+			+ (n + n/8) * sizeof(struct xunpcb);
+		return (0);
+	}
+
+	if (req->newptr != NULL)
+		return (EPERM);
+
+	/*
+	 * OK, now we're committed to doing something.
+	 */
+	xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
+	UNP_LIST_LOCK();
+	gencnt = unp_gencnt;
+	n = unp_count;
+	UNP_LIST_UNLOCK();
+
+	xug->xug_len = sizeof *xug;
+	xug->xug_count = n;
+	xug->xug_gen = gencnt;
+	xug->xug_sogen = so_gencnt;
+	error = SYSCTL_OUT(req, xug, sizeof *xug);
+	if (error) {
+		free(xug, M_TEMP);
+		return (error);
+	}
+
+	unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
+
+	UNP_LIST_LOCK();
+	for (unp = LIST_FIRST(head), i = 0; unp && i < n;
+	     unp = LIST_NEXT(unp, unp_link)) {
+		UNP_PCB_LOCK(unp);
+		if (unp->unp_gencnt <= gencnt) {
+			if (cr_cansee(req->td->td_ucred,
+			    unp->unp_socket->so_cred)) {
+				UNP_PCB_UNLOCK(unp);
+				continue;
+			}
+			unp_list[i++] = unp;
+			unp->unp_refcount++;
+		}
+		UNP_PCB_UNLOCK(unp);
+	}
+	UNP_LIST_UNLOCK();
+	n = i;			/* In case we lost some during malloc. */
+
+	error = 0;
+	xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO);
+	for (i = 0; i < n; i++) {
+		unp = unp_list[i];
+		UNP_PCB_LOCK(unp);
+		unp->unp_refcount--;
+	        if (unp->unp_refcount != 0 && unp->unp_gencnt <= gencnt) {
+			xu->xu_len = sizeof *xu;
+			xu->xu_unpp = unp;
+			/*
+			 * XXX - need more locking here to protect against
+			 * connect/disconnect races for SMP.
+			 */
+			if (unp->unp_addr != NULL)
+				bcopy(unp->unp_addr, &xu->xu_addr,
+				      unp->unp_addr->sun_len);
+			if (unp->unp_conn != NULL &&
+			    unp->unp_conn->unp_addr != NULL)
+				bcopy(unp->unp_conn->unp_addr,
+				      &xu->xu_caddr,
+				      unp->unp_conn->unp_addr->sun_len);
+			bcopy(unp, &xu->xu_unp, sizeof *unp);
+			sotoxsocket(unp->unp_socket, &xu->xu_socket);
+			UNP_PCB_UNLOCK(unp);
+			error = SYSCTL_OUT(req, xu, sizeof *xu);
+		} else {
+			freeunp = (unp->unp_refcount == 0);
+			UNP_PCB_UNLOCK(unp);
+			if (freeunp) {
+				UNP_PCB_LOCK_DESTROY(unp);
+				uma_zfree(unp_zone, unp);
+			}
+		}
+	}
+	free(xu, M_TEMP);
+	if (!error) {
+		/*
+		 * Give the user an updated idea of our state.  If the
+		 * generation differs from what we told her before, she knows
+		 * that something happened while we were processing this
+		 * request, and it might be necessary to retry.
+		 */
+		xug->xug_gen = unp_gencnt;
+		xug->xug_sogen = so_gencnt;
+		xug->xug_count = unp_count;
+		error = SYSCTL_OUT(req, xug, sizeof *xug);
+	}
+	free(unp_list, M_TEMP);
+	free(xug, M_TEMP);
+	return (error);
+}
+
+SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
+    (void *)(intptr_t)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
+    "List of active local datagram sockets");
+SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
+    (void *)(intptr_t)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
+    "List of active local stream sockets");
+SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist,
+    CTLTYPE_OPAQUE | CTLFLAG_RD,
+    (void *)(intptr_t)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb",
+    "List of active local seqpacket sockets");
+
+static void
+unp_shutdown(struct unpcb *unp)
+{
+	struct unpcb *unp2;
+	struct socket *so;
+
+	UNP_LINK_WLOCK_ASSERT();
+	UNP_PCB_LOCK_ASSERT(unp);
+
+	unp2 = unp->unp_conn;
+	if ((unp->unp_socket->so_type == SOCK_STREAM ||
+	    (unp->unp_socket->so_type == SOCK_SEQPACKET)) && unp2 != NULL) {
+		so = unp2->unp_socket;
+		if (so != NULL)
+			socantrcvmore(so);
+	}
+}
+
+static void
+#ifndef __rtems__
+unp_drop(struct unpcb *unp, int errno)
+#else /* __rtems__ */
+unp_drop(struct unpcb *unp, int error)
+#endif /* __rtems__ */
+{
+	struct socket *so = unp->unp_socket;
+	struct unpcb *unp2;
+
+	UNP_LINK_WLOCK_ASSERT();
+	UNP_PCB_LOCK_ASSERT(unp);
+
+#ifndef __rtems__
+	so->so_error = errno;
+#else /* __rtems__ */
+	so->so_error = error;
+#endif /* __rtems__ */
+	unp2 = unp->unp_conn;
+	if (unp2 == NULL)
+		return;
+	UNP_PCB_LOCK(unp2);
+	unp_disconnect(unp, unp2);
+	UNP_PCB_UNLOCK(unp2);
+}
+
+#ifndef __rtems__
+static void
+unp_freerights(struct file **rp, int fdcount)
+{
+	int i;
+	struct file *fp;
+
+	for (i = 0; i < fdcount; i++) {
+		fp = *rp;
+		*rp++ = NULL;
+		unp_discard(fp);
+	}
+}
+
+static int
+unp_externalize(struct mbuf *control, struct mbuf **controlp)
+{
+	struct thread *td = curthread;		/* XXX */
+	struct cmsghdr *cm = mtod(control, struct cmsghdr *);
+	int i;
+	int *fdp;
+	struct file **rp;
+	struct file *fp;
+	void *data;
+	socklen_t clen = control->m_len, datalen;
+	int error, newfds;
+	u_int newlen;
+
+	UNP_LINK_UNLOCK_ASSERT();
+
+	error = 0;
+	if (controlp != NULL) /* controlp == NULL => free control messages */
+		*controlp = NULL;
+	while (cm != NULL) {
+		if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
+			error = EINVAL;
+			break;
+		}
+		data = CMSG_DATA(cm);
+		datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
+		if (cm->cmsg_level == SOL_SOCKET
+		    && cm->cmsg_type == SCM_RIGHTS) {
+			newfds = datalen / sizeof(struct file *);
+			rp = data;
+
+			/* If we're not outputting the descriptors free them. */
+			if (error || controlp == NULL) {
+				unp_freerights(rp, newfds);
+				goto next;
+			}
+			FILEDESC_XLOCK(td->td_proc->p_fd);
+			/*
+			 * Now change each pointer to an fd in the global
+			 * table to an integer that is the index to the local
+			 * fd table entry that we set up to point to the
+			 * global one we are transferring.
+			 */
+			newlen = newfds * sizeof(int);
+			*controlp = sbcreatecontrol(NULL, newlen,
+			    SCM_RIGHTS, SOL_SOCKET);
+			if (*controlp == NULL) {
+				FILEDESC_XUNLOCK(td->td_proc->p_fd);
+				error = E2BIG;
+				unp_freerights(rp, newfds);
+				goto next;
+			}
+
+			fdp = (int *)
+			    CMSG_DATA(mtod(*controlp, struct cmsghdr *));
+			if (fdallocn(td, 0, fdp, newfds) != 0) {
+				FILEDESC_XUNLOCK(td->td_proc->p_fd);
+				error = EMSGSIZE;
+				unp_freerights(rp, newfds);
+				m_freem(*controlp);
+				*controlp = NULL;
+				goto next;
+			}
+			for (i = 0; i < newfds; i++) {
+				fp = *rp++;
+				td->td_proc->p_fd->fd_ofiles[fdp[i]] = fp;
+				unp_externalize_fp(fp);
+			}
+			FILEDESC_XUNLOCK(td->td_proc->p_fd);
+		} else {
+			/* We can just copy anything else across. */
+			if (error || controlp == NULL)
+				goto next;
+			*controlp = sbcreatecontrol(NULL, datalen,
+			    cm->cmsg_type, cm->cmsg_level);
+			if (*controlp == NULL) {
+				error = ENOBUFS;
+				goto next;
+			}
+			bcopy(data,
+			    CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
+			    datalen);
+		}
+		controlp = &(*controlp)->m_next;
+
+next:
+		if (CMSG_SPACE(datalen) < clen) {
+			clen -= CMSG_SPACE(datalen);
+			cm = (struct cmsghdr *)
+			    ((caddr_t)cm + CMSG_SPACE(datalen));
+		} else {
+			clen = 0;
+			cm = NULL;
+		}
+	}
+
+	m_freem(control);
+	return (error);
+}
+#endif /* __rtems__ */
+
+static void
+unp_zone_change(void *tag)
+{
+
+	uma_zone_set_max(unp_zone, maxsockets);
+}
+
+static void
+unp_init(void)
+{
+
+#ifdef VIMAGE
+	if (!IS_DEFAULT_VNET(curvnet))
+		return;
+#endif
+	unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
+	    NULL, NULL, UMA_ALIGN_PTR, 0);
+	if (unp_zone == NULL)
+		panic("unp_init");
+	uma_zone_set_max(unp_zone, maxsockets);
+	EVENTHANDLER_REGISTER(maxsockets_change, unp_zone_change,
+	    NULL, EVENTHANDLER_PRI_ANY);
+	LIST_INIT(&unp_dhead);
+	LIST_INIT(&unp_shead);
+	LIST_INIT(&unp_sphead);
+#ifndef __rtems__
+	SLIST_INIT(&unp_defers);
+	TIMEOUT_TASK_INIT(taskqueue_thread, &unp_gc_task, 0, unp_gc, NULL);
+	TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL);
+#endif /* __rtems__ */
+	UNP_LINK_LOCK_INIT();
+	UNP_LIST_LOCK_INIT();
+	UNP_DEFERRED_LOCK_INIT();
+}
+
+#ifndef __rtems__
+static int
+unp_internalize(struct mbuf **controlp, struct thread *td)
+{
+	struct mbuf *control = *controlp;
+	struct proc *p = td->td_proc;
+	struct filedesc *fdescp = p->p_fd;
+	struct bintime *bt;
+	struct cmsghdr *cm = mtod(control, struct cmsghdr *);
+	struct cmsgcred *cmcred;
+	struct file **rp;
+	struct file *fp;
+	struct timeval *tv;
+	int i, fd, *fdp;
+	void *data;
+	socklen_t clen = control->m_len, datalen;
+	int error, oldfds;
+	u_int newlen;
+
+	UNP_LINK_UNLOCK_ASSERT();
+
+	error = 0;
+	*controlp = NULL;
+	while (cm != NULL) {
+		if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
+		    || cm->cmsg_len > clen) {
+			error = EINVAL;
+			goto out;
+		}
+		data = CMSG_DATA(cm);
+		datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
+
+		switch (cm->cmsg_type) {
+		/*
+		 * Fill in credential information.
+		 */
+		case SCM_CREDS:
+			*controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
+			    SCM_CREDS, SOL_SOCKET);
+			if (*controlp == NULL) {
+				error = ENOBUFS;
+				goto out;
+			}
+			cmcred = (struct cmsgcred *)
+			    CMSG_DATA(mtod(*controlp, struct cmsghdr *));
+			cmcred->cmcred_pid = p->p_pid;
+			cmcred->cmcred_uid = td->td_ucred->cr_ruid;
+			cmcred->cmcred_gid = td->td_ucred->cr_rgid;
+			cmcred->cmcred_euid = td->td_ucred->cr_uid;
+			cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
+			    CMGROUP_MAX);
+			for (i = 0; i < cmcred->cmcred_ngroups; i++)
+				cmcred->cmcred_groups[i] =
+				    td->td_ucred->cr_groups[i];
+			break;
+
+		case SCM_RIGHTS:
+			oldfds = datalen / sizeof (int);
+			/*
+			 * Check that all the FDs passed in refer to legal
+			 * files.  If not, reject the entire operation.
+			 */
+			fdp = data;
+			FILEDESC_SLOCK(fdescp);
+			for (i = 0; i < oldfds; i++) {
+				fd = *fdp++;
+				if ((unsigned)fd >= fdescp->fd_nfiles ||
+				    fdescp->fd_ofiles[fd] == NULL) {
+					FILEDESC_SUNLOCK(fdescp);
+					error = EBADF;
+					goto out;
+				}
+				fp = fdescp->fd_ofiles[fd];
+				if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
+					FILEDESC_SUNLOCK(fdescp);
+					error = EOPNOTSUPP;
+					goto out;
+				}
+
+			}
+
+			/*
+			 * Now replace the integer FDs with pointers to the
+			 * associated global file table entry..
+			 */
+			newlen = oldfds * sizeof(struct file *);
+			*controlp = sbcreatecontrol(NULL, newlen,
+			    SCM_RIGHTS, SOL_SOCKET);
+			if (*controlp == NULL) {
+				FILEDESC_SUNLOCK(fdescp);
+				error = E2BIG;
+				goto out;
+			}
+			fdp = data;
+			rp = (struct file **)
+			    CMSG_DATA(mtod(*controlp, struct cmsghdr *));
+			for (i = 0; i < oldfds; i++) {
+				fp = fdescp->fd_ofiles[*fdp++];
+				*rp++ = fp;
+				unp_internalize_fp(fp);
+			}
+			FILEDESC_SUNLOCK(fdescp);
+			break;
+
+		case SCM_TIMESTAMP:
+			*controlp = sbcreatecontrol(NULL, sizeof(*tv),
+			    SCM_TIMESTAMP, SOL_SOCKET);
+			if (*controlp == NULL) {
+				error = ENOBUFS;
+				goto out;
+			}
+			tv = (struct timeval *)
+			    CMSG_DATA(mtod(*controlp, struct cmsghdr *));
+			microtime(tv);
+			break;
+
+		case SCM_BINTIME:
+			*controlp = sbcreatecontrol(NULL, sizeof(*bt),
+			    SCM_BINTIME, SOL_SOCKET);
+			if (*controlp == NULL) {
+				error = ENOBUFS;
+				goto out;
+			}
+			bt = (struct bintime *)
+			    CMSG_DATA(mtod(*controlp, struct cmsghdr *));
+			bintime(bt);
+			break;
+
+		default:
+			error = EINVAL;
+			goto out;
+		}
+
+		controlp = &(*controlp)->m_next;
+		if (CMSG_SPACE(datalen) < clen) {
+			clen -= CMSG_SPACE(datalen);
+			cm = (struct cmsghdr *)
+			    ((caddr_t)cm + CMSG_SPACE(datalen));
+		} else {
+			clen = 0;
+			cm = NULL;
+		}
+	}
+
+out:
+	m_freem(control);
+	return (error);
+}
+
+static struct mbuf *
+unp_addsockcred(struct thread *td, struct mbuf *control)
+{
+	struct mbuf *m, *n, *n_prev;
+	struct sockcred *sc;
+	const struct cmsghdr *cm;
+	int ngroups;
+	int i;
+
+	ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX);
+	m = sbcreatecontrol(NULL, SOCKCREDSIZE(ngroups), SCM_CREDS, SOL_SOCKET);
+	if (m == NULL)
+		return (control);
+
+	sc = (struct sockcred *) CMSG_DATA(mtod(m, struct cmsghdr *));
+	sc->sc_uid = td->td_ucred->cr_ruid;
+	sc->sc_euid = td->td_ucred->cr_uid;
+	sc->sc_gid = td->td_ucred->cr_rgid;
+	sc->sc_egid = td->td_ucred->cr_gid;
+	sc->sc_ngroups = ngroups;
+	for (i = 0; i < sc->sc_ngroups; i++)
+		sc->sc_groups[i] = td->td_ucred->cr_groups[i];
+
+	/*
+	 * Unlink SCM_CREDS control messages (struct cmsgcred), since just
+	 * created SCM_CREDS control message (struct sockcred) has another
+	 * format.
+	 */
+	if (control != NULL)
+		for (n = control, n_prev = NULL; n != NULL;) {
+			cm = mtod(n, struct cmsghdr *);
+    			if (cm->cmsg_level == SOL_SOCKET &&
+			    cm->cmsg_type == SCM_CREDS) {
+    				if (n_prev == NULL)
+					control = n->m_next;
+				else
+					n_prev->m_next = n->m_next;
+				n = m_free(n);
+			} else {
+				n_prev = n;
+				n = n->m_next;
+			}
+		}
+
+	/* Prepend it to the head. */
+	m->m_next = control;
+	return (m);
+}
+
+static struct unpcb *
+fptounp(struct file *fp)
+{
+	struct socket *so;
+
+	if (fp->f_type != DTYPE_SOCKET)
+		return (NULL);
+	if ((so = fp->f_data) == NULL)
+		return (NULL);
+	if (so->so_proto->pr_domain != &localdomain)
+		return (NULL);
+	return sotounpcb(so);
+}
+
+static void
+unp_discard(struct file *fp)
+{
+	struct unp_defer *dr;
+
+	if (unp_externalize_fp(fp)) {
+		dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK);
+		dr->ud_fp = fp;
+		UNP_DEFERRED_LOCK();
+		SLIST_INSERT_HEAD(&unp_defers, dr, ud_link);
+		UNP_DEFERRED_UNLOCK();
+		atomic_add_int(&unp_defers_count, 1);
+		taskqueue_enqueue(taskqueue_thread, &unp_defer_task);
+	} else
+		(void) closef(fp, (struct thread *)NULL);
+}
+
+static void
+unp_process_defers(void *arg __unused, int pending)
+{
+	struct unp_defer *dr;
+	SLIST_HEAD(, unp_defer) drl;
+	int count;
+
+	SLIST_INIT(&drl);
+	for (;;) {
+		UNP_DEFERRED_LOCK();
+		if (SLIST_FIRST(&unp_defers) == NULL) {
+			UNP_DEFERRED_UNLOCK();
+			break;
+		}
+		SLIST_SWAP(&unp_defers, &drl, unp_defer);
+		UNP_DEFERRED_UNLOCK();
+		count = 0;
+		while ((dr = SLIST_FIRST(&drl)) != NULL) {
+			SLIST_REMOVE_HEAD(&drl, ud_link);
+			closef(dr->ud_fp, NULL);
+			free(dr, M_TEMP);
+			count++;
+		}
+		atomic_add_int(&unp_defers_count, -count);
+	}
+}
+
+static void
+unp_internalize_fp(struct file *fp)
+{
+	struct unpcb *unp;
+
+	UNP_LINK_WLOCK();
+	if ((unp = fptounp(fp)) != NULL) {
+		unp->unp_file = fp;
+		unp->unp_msgcount++;
+	}
+	fhold(fp);
+	unp_rights++;
+	UNP_LINK_WUNLOCK();
+}
+
+static int
+unp_externalize_fp(struct file *fp)
+{
+	struct unpcb *unp;
+	int ret;
+
+	UNP_LINK_WLOCK();
+	if ((unp = fptounp(fp)) != NULL) {
+		unp->unp_msgcount--;
+		ret = 1;
+	} else
+		ret = 0;
+	unp_rights--;
+	UNP_LINK_WUNLOCK();
+	return (ret);
+}
+
+/*
+ * unp_defer indicates whether additional work has been defered for a future
+ * pass through unp_gc().  It is thread local and does not require explicit
+ * synchronization.
+ */
+static int	unp_marked;
+static int	unp_unreachable;
+
+static void
+unp_accessable(struct file *fp)
+{
+	struct unpcb *unp;
+
+	if ((unp = fptounp(fp)) == NULL)
+		return;
+	if (unp->unp_gcflag & UNPGC_REF)
+		return;
+	unp->unp_gcflag &= ~UNPGC_DEAD;
+	unp->unp_gcflag |= UNPGC_REF;
+	unp_marked++;
+}
+
+static void
+unp_gc_process(struct unpcb *unp)
+{
+	struct socket *soa;
+	struct socket *so;
+	struct file *fp;
+
+	/* Already processed. */
+	if (unp->unp_gcflag & UNPGC_SCANNED)
+		return;
+	fp = unp->unp_file;
+
+	/*
+	 * Check for a socket potentially in a cycle.  It must be in a
+	 * queue as indicated by msgcount, and this must equal the file
+	 * reference count.  Note that when msgcount is 0 the file is NULL.
+	 */
+	if ((unp->unp_gcflag & UNPGC_REF) == 0 && fp &&
+	    unp->unp_msgcount != 0 && fp->f_count == unp->unp_msgcount) {
+		unp->unp_gcflag |= UNPGC_DEAD;
+		unp_unreachable++;
+		return;
+	}
+
+	/*
+	 * Mark all sockets we reference with RIGHTS.
+	 */
+	so = unp->unp_socket;
+	SOCKBUF_LOCK(&so->so_rcv);
+	unp_scan(so->so_rcv.sb_mb, unp_accessable);
+	SOCKBUF_UNLOCK(&so->so_rcv);
+
+	/*
+	 * Mark all sockets in our accept queue.
+	 */
+	ACCEPT_LOCK();
+	TAILQ_FOREACH(soa, &so->so_comp, so_list) {
+		SOCKBUF_LOCK(&soa->so_rcv);
+		unp_scan(soa->so_rcv.sb_mb, unp_accessable);
+		SOCKBUF_UNLOCK(&soa->so_rcv);
+	}
+	ACCEPT_UNLOCK();
+	unp->unp_gcflag |= UNPGC_SCANNED;
+}
+
+static int unp_recycled;
+SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0, 
+    "Number of unreachable sockets claimed by the garbage collector.");
+
+static int unp_taskcount;
+SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0, 
+    "Number of times the garbage collector has run.");
+
+static void
+unp_gc(__unused void *arg, int pending)
+{
+	struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead,
+				    NULL };
+	struct unp_head **head;
+	struct file *f, **unref;
+	struct unpcb *unp;
+	int i, total;
+
+	unp_taskcount++;
+	UNP_LIST_LOCK();
+	/*
+	 * First clear all gc flags from previous runs.
+	 */
+	for (head = heads; *head != NULL; head++)
+		LIST_FOREACH(unp, *head, unp_link)
+			unp->unp_gcflag = 0;
+
+	/*
+	 * Scan marking all reachable sockets with UNPGC_REF.  Once a socket
+	 * is reachable all of the sockets it references are reachable.
+	 * Stop the scan once we do a complete loop without discovering
+	 * a new reachable socket.
+	 */
+	do {
+		unp_unreachable = 0;
+		unp_marked = 0;
+		for (head = heads; *head != NULL; head++)
+			LIST_FOREACH(unp, *head, unp_link)
+				unp_gc_process(unp);
+	} while (unp_marked);
+	UNP_LIST_UNLOCK();
+	if (unp_unreachable == 0)
+		return;
+
+	/*
+	 * Allocate space for a local list of dead unpcbs.
+	 */
+	unref = malloc(unp_unreachable * sizeof(struct file *),
+	    M_TEMP, M_WAITOK);
+
+	/*
+	 * Iterate looking for sockets which have been specifically marked
+	 * as as unreachable and store them locally.
+	 */
+	UNP_LINK_RLOCK();
+	UNP_LIST_LOCK();
+	for (total = 0, head = heads; *head != NULL; head++)
+		LIST_FOREACH(unp, *head, unp_link)
+			if ((unp->unp_gcflag & UNPGC_DEAD) != 0) {
+				f = unp->unp_file;
+				if (unp->unp_msgcount == 0 || f == NULL ||
+				    f->f_count != unp->unp_msgcount)
+					continue;
+				unref[total++] = f;
+				fhold(f);
+				KASSERT(total <= unp_unreachable,
+				    ("unp_gc: incorrect unreachable count."));
+			}
+	UNP_LIST_UNLOCK();
+	UNP_LINK_RUNLOCK();
+
+	/*
+	 * Now flush all sockets, free'ing rights.  This will free the
+	 * struct files associated with these sockets but leave each socket
+	 * with one remaining ref.
+	 */
+	for (i = 0; i < total; i++) {
+		struct socket *so;
+
+		so = unref[i]->f_data;
+		CURVNET_SET(so->so_vnet);
+		sorflush(so);
+		CURVNET_RESTORE();
+	}
+
+	/*
+	 * And finally release the sockets so they can be reclaimed.
+	 */
+	for (i = 0; i < total; i++)
+		fdrop(unref[i], NULL);
+	unp_recycled += total;
+	free(unref, M_TEMP);
+}
+
+static void
+unp_dispose(struct mbuf *m)
+{
+
+	if (m)
+		unp_scan(m, unp_discard);
+}
+
+static void
+unp_scan(struct mbuf *m0, void (*op)(struct file *))
+{
+	struct mbuf *m;
+	struct file **rp;
+	struct cmsghdr *cm;
+	void *data;
+	int i;
+	socklen_t clen, datalen;
+	int qfds;
+
+	while (m0 != NULL) {
+		for (m = m0; m; m = m->m_next) {
+			if (m->m_type != MT_CONTROL)
+				continue;
+
+			cm = mtod(m, struct cmsghdr *);
+			clen = m->m_len;
+
+			while (cm != NULL) {
+				if (sizeof(*cm) > clen || cm->cmsg_len > clen)
+					break;
+
+				data = CMSG_DATA(cm);
+				datalen = (caddr_t)cm + cm->cmsg_len
+				    - (caddr_t)data;
+
+				if (cm->cmsg_level == SOL_SOCKET &&
+				    cm->cmsg_type == SCM_RIGHTS) {
+					qfds = datalen / sizeof (struct file *);
+					rp = data;
+					for (i = 0; i < qfds; i++)
+						(*op)(*rp++);
+				}
+
+				if (CMSG_SPACE(datalen) < clen) {
+					clen -= CMSG_SPACE(datalen);
+					cm = (struct cmsghdr *)
+					    ((caddr_t)cm + CMSG_SPACE(datalen));
+				} else {
+					clen = 0;
+					cm = NULL;
+				}
+			}
+		}
+		m0 = m0->m_act;
+	}
+}
+
+/*
+ * A helper function called by VFS before socket-type vnode reclamation.
+ * For an active vnode it clears unp_vnode pointer and decrements unp_vnode
+ * use count.
+ */
+void
+vfs_unp_reclaim(struct vnode *vp)
+{
+	struct socket *so;
+	struct unpcb *unp;
+	int active;
+
+	ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim");
+	KASSERT(vp->v_type == VSOCK,
+	    ("vfs_unp_reclaim: vp->v_type != VSOCK"));
+
+	active = 0;
+	UNP_LINK_WLOCK();
+	VOP_UNP_CONNECT(vp, &so);
+	if (so == NULL)
+		goto done;
+	unp = sotounpcb(so);
+	if (unp == NULL)
+		goto done;
+	UNP_PCB_LOCK(unp);
+	if (unp->unp_vnode == vp) {
+		VOP_UNP_DETACH(vp);
+		unp->unp_vnode = NULL;
+		active = 1;
+	}
+	UNP_PCB_UNLOCK(unp);
+done:
+	UNP_LINK_WUNLOCK();
+	if (active)
+		vunref(vp);
+}
+#endif /* __rtems__ */
+
+#ifdef DDB
+static void
+db_print_indent(int indent)
+{
+	int i;
+
+	for (i = 0; i < indent; i++)
+		db_printf(" ");
+}
+
+static void
+db_print_unpflags(int unp_flags)
+{
+	int comma;
+
+	comma = 0;
+	if (unp_flags & UNP_HAVEPC) {
+		db_printf("%sUNP_HAVEPC", comma ? ", " : "");
+		comma = 1;
+	}
+	if (unp_flags & UNP_HAVEPCCACHED) {
+		db_printf("%sUNP_HAVEPCCACHED", comma ? ", " : "");
+		comma = 1;
+	}
+	if (unp_flags & UNP_WANTCRED) {
+		db_printf("%sUNP_WANTCRED", comma ? ", " : "");
+		comma = 1;
+	}
+	if (unp_flags & UNP_CONNWAIT) {
+		db_printf("%sUNP_CONNWAIT", comma ? ", " : "");
+		comma = 1;
+	}
+	if (unp_flags & UNP_CONNECTING) {
+		db_printf("%sUNP_CONNECTING", comma ? ", " : "");
+		comma = 1;
+	}
+	if (unp_flags & UNP_BINDING) {
+		db_printf("%sUNP_BINDING", comma ? ", " : "");
+		comma = 1;
+	}
+}
+
+static void
+db_print_xucred(int indent, struct xucred *xu)
+{
+	int comma, i;
+
+	db_print_indent(indent);
+	db_printf("cr_version: %u   cr_uid: %u   cr_ngroups: %d\n",
+	    xu->cr_version, xu->cr_uid, xu->cr_ngroups);
+	db_print_indent(indent);
+	db_printf("cr_groups: ");
+	comma = 0;
+	for (i = 0; i < xu->cr_ngroups; i++) {
+		db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]);
+		comma = 1;
+	}
+	db_printf("\n");
+}
+
+static void
+db_print_unprefs(int indent, struct unp_head *uh)
+{
+	struct unpcb *unp;
+	int counter;
+
+	counter = 0;
+	LIST_FOREACH(unp, uh, unp_reflink) {
+		if (counter % 4 == 0)
+			db_print_indent(indent);
+		db_printf("%p  ", unp);
+		if (counter % 4 == 3)
+			db_printf("\n");
+		counter++;
+	}
+	if (counter != 0 && counter % 4 != 0)
+		db_printf("\n");
+}
+
+DB_SHOW_COMMAND(unpcb, db_show_unpcb)
+{
+	struct unpcb *unp;
+
+        if (!have_addr) {
+                db_printf("usage: show unpcb <addr>\n");
+                return;
+        }
+        unp = (struct unpcb *)addr;
+
+	db_printf("unp_socket: %p   unp_vnode: %p\n", unp->unp_socket,
+	    unp->unp_vnode);
+
+	db_printf("unp_ino: %d   unp_conn: %p\n", unp->unp_ino,
+	    unp->unp_conn);
+
+	db_printf("unp_refs:\n");
+	db_print_unprefs(2, &unp->unp_refs);
+
+	/* XXXRW: Would be nice to print the full address, if any. */
+	db_printf("unp_addr: %p\n", unp->unp_addr);
+
+	db_printf("unp_cc: %d   unp_mbcnt: %d   unp_gencnt: %llu\n",
+	    unp->unp_cc, unp->unp_mbcnt,
+	    (unsigned long long)unp->unp_gencnt);
+
+	db_printf("unp_flags: %x (", unp->unp_flags);
+	db_print_unpflags(unp->unp_flags);
+	db_printf(")\n");
+
+	db_printf("unp_peercred:\n");
+	db_print_xucred(2, &unp->unp_peercred);
+
+	db_printf("unp_refcount: %u\n", unp->unp_refcount);
+}
+#endif
diff --git a/freebsd/sys/sys/kernel.h b/freebsd/sys/sys/kernel.h
index c3e83022..1318243f 100644
--- a/freebsd/sys/sys/kernel.h
+++ b/freebsd/sys/sys/kernel.h
@@ -265,6 +265,8 @@ struct sysinit {
 	SYSINIT_REFERENCE(mod ## module)
 #define	SYSINIT_DRIVER_REFERENCE(driver, bus)			\
 	SYSINIT_MODULE_REFERENCE(driver ## _ ## bus)
+#define	SYSINIT_DOMAIN_REFERENCE(dom)				\
+	SYSINIT_REFERENCE(domain_add_ ## dom)
 #endif /* __rtems__ */
 
 #define	SYSINIT(uniquifier, subsystem, order, func, ident)	\
diff --git a/freebsd/sys/sys/unpcb.h b/freebsd/sys/sys/unpcb.h
index 4d69f3e5..d141b966 100644
--- a/freebsd/sys/sys/unpcb.h
+++ b/freebsd/sys/sys/unpcb.h
@@ -68,7 +68,11 @@ struct unpcb {
 	LIST_ENTRY(unpcb) unp_link; 	/* glue on list of all PCBs */
 	struct	socket *unp_socket;	/* pointer back to socket */
 	struct	file *unp_file;		/* back-pointer to file for gc. */
+#ifndef __rtems__
 	struct	vnode *unp_vnode;	/* if associated with file */
+#else /* __rtems__ */
+	struct	IMFS_jnode_tt *unp_vnode;	/* if associated with file */
+#endif /* __rtems__ */
 	ino_t	unp_ino;		/* fake inode number */
 	struct	unpcb *unp_conn;	/* control block of connected socket */
 	struct	unp_head unp_refs;	/* referencing socket linked list */