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diff --git a/ipc/ipc_marequest.c b/ipc/ipc_marequest.c
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+++ b/ipc/ipc_marequest.c
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+/*
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University.
+ * Copyright (c) 1993,1994 The University of Utah and
+ * the Computer Systems Laboratory (CSL).
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON, THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF
+ * THIS SOFTWARE IN ITS "AS IS" CONDITION, AND DISCLAIM ANY LIABILITY
+ * OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF
+ * THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ *	File:	ipc/ipc_marequest.c
+ *	Author:	Rich Draves
+ *	Date:	1989
+ *
+ *	Functions to handle msg-accepted requests.
+ */
+
+#include <mach/message.h>
+#include <mach/port.h>
+#include <kern/lock.h>
+#include <kern/kalloc.h>
+#include <kern/slab.h>
+#include <ipc/port.h>
+#include <ipc/ipc_init.h>
+#include <ipc/ipc_space.h>
+#include <ipc/ipc_entry.h>
+#include <ipc/ipc_port.h>
+#include <ipc/ipc_right.h>
+#include <ipc/ipc_marequest.h>
+#include <ipc/ipc_notify.h>
+
+#if	MACH_IPC_DEBUG
+#include <mach/kern_return.h>
+#include <mach_debug/hash_info.h>
+#include <vm/vm_map.h>
+#include <vm/vm_kern.h>
+#include <vm/vm_user.h>
+#endif
+
+
+struct kmem_cache ipc_marequest_cache;
+
+#define	imar_alloc()		((ipc_marequest_t) kmem_cache_alloc(&ipc_marequest_cache))
+#define	imar_free(imar)		kmem_cache_free(&ipc_marequest_cache, (vm_offset_t) (imar))
+
+typedef unsigned int ipc_marequest_index_t;
+
+ipc_marequest_index_t ipc_marequest_size;
+ipc_marequest_index_t ipc_marequest_mask;
+
+#define	IMAR_HASH(space, name)						\
+		((((ipc_marequest_index_t)((vm_offset_t)space) >> 4) +	\
+		  MACH_PORT_INDEX(name) + MACH_PORT_NGEN(name)) &	\
+		 ipc_marequest_mask)
+
+typedef struct ipc_marequest_bucket {
+	decl_simple_lock_data(, imarb_lock_data)
+	ipc_marequest_t imarb_head;
+} *ipc_marequest_bucket_t;
+
+#define	IMARB_NULL	((ipc_marequest_bucket_t) 0)
+
+#define	imarb_lock_init(imarb)	simple_lock_init(&(imarb)->imarb_lock_data)
+#define	imarb_lock(imarb)	simple_lock(&(imarb)->imarb_lock_data)
+#define	imarb_unlock(imarb)	simple_unlock(&(imarb)->imarb_lock_data)
+
+ipc_marequest_bucket_t ipc_marequest_table;
+
+
+
+/*
+ *	Routine:	ipc_marequest_init
+ *	Purpose:
+ *		Initialize the msg-accepted request module.
+ */
+
+void
+ipc_marequest_init(void)
+{
+	ipc_marequest_index_t i;
+
+	/* initialize ipc_marequest_size */
+
+	ipc_marequest_size = IPC_MAREQUEST_SIZE;
+
+	/* make sure it is a power of two */
+
+	ipc_marequest_mask = ipc_marequest_size - 1;
+	if ((ipc_marequest_size & ipc_marequest_mask) != 0) {
+		unsigned int bit;
+
+		/* round up to closest power of two */
+
+		for (bit = 1;; bit <<= 1) {
+			ipc_marequest_mask |= bit;
+			ipc_marequest_size = ipc_marequest_mask + 1;
+
+			if ((ipc_marequest_size & ipc_marequest_mask) == 0)
+				break;
+		}
+	}
+
+	/* allocate ipc_marequest_table */
+
+	ipc_marequest_table = (ipc_marequest_bucket_t)
+		kalloc((vm_size_t) (ipc_marequest_size *
+				    sizeof(struct ipc_marequest_bucket)));
+	assert(ipc_marequest_table != IMARB_NULL);
+
+	/* and initialize it */
+
+	for (i = 0; i < ipc_marequest_size; i++) {
+		ipc_marequest_bucket_t bucket;
+
+		bucket = &ipc_marequest_table[i];
+		imarb_lock_init(bucket);
+		bucket->imarb_head = IMAR_NULL;
+	}
+
+	kmem_cache_init(&ipc_marequest_cache, "ipc_marequest",
+			sizeof(struct ipc_marequest), 0, NULL, 0);
+}
+
+/*
+ *	Routine:	ipc_marequest_create
+ *	Purpose:
+ *		Create a msg-accepted request, because
+ *		a sender is forcing a message with MACH_SEND_NOTIFY.
+ *
+ *		The "notify" argument should name a receive right
+ *		that is used to create the send-once notify port.
+ *	Conditions:
+ *		Nothing locked; refs held for space and port.
+ *	Returns:
+ *		MACH_MSG_SUCCESS	Msg-accepted request created.
+ *		MACH_SEND_INVALID_NOTIFY	The space is dead.
+ *		MACH_SEND_INVALID_NOTIFY	The notify port is bad.
+ *		MACH_SEND_NOTIFY_IN_PROGRESS
+ *			This space has already forced a message to this port.
+ *		MACH_SEND_NO_NOTIFY	Can't allocate a msg-accepted request.
+ */
+
+mach_msg_return_t
+ipc_marequest_create(
+	ipc_space_t 		space,
+	ipc_port_t 		port,
+	mach_port_name_t 	notify,
+	ipc_marequest_t 	*marequestp)
+{
+	mach_port_name_t name;
+	ipc_entry_t entry;
+	ipc_port_t soright;
+	ipc_marequest_t marequest;
+	ipc_marequest_bucket_t bucket;
+
+	marequest = imar_alloc();
+	if (marequest == IMAR_NULL)
+		return MACH_SEND_NO_NOTIFY;
+
+	/*
+	 *	Delay creating the send-once right until
+	 *	we know there will be no errors.  Otherwise,
+	 *	we would have to worry about disposing of it
+	 *	when it turned out it wasn't needed.
+	 */
+
+	is_write_lock(space);
+	if (!space->is_active) {
+		is_write_unlock(space);
+		imar_free(marequest);
+		return MACH_SEND_INVALID_NOTIFY;
+	}
+
+	if (ipc_right_reverse(space, (ipc_object_t) port, &name, &entry)) {
+		ipc_entry_bits_t bits;
+
+		/* port is locked and active */
+		ip_unlock(port);
+		bits = entry->ie_bits;
+
+		assert(port == (ipc_port_t) entry->ie_object);
+		assert(bits & MACH_PORT_TYPE_SEND_RECEIVE);
+
+		if (bits & IE_BITS_MAREQUEST) {
+			is_write_unlock(space);
+			imar_free(marequest);
+			return MACH_SEND_NOTIFY_IN_PROGRESS;
+		}
+
+		if ((soright = ipc_port_lookup_notify(space, notify))
+								== IP_NULL) {
+			is_write_unlock(space);
+			imar_free(marequest);
+			return MACH_SEND_INVALID_NOTIFY;
+		}
+
+		entry->ie_bits = bits | IE_BITS_MAREQUEST;
+
+		is_reference(space);
+		marequest->imar_space = space;
+		marequest->imar_name = name;
+		marequest->imar_soright = soright;
+
+		bucket = &ipc_marequest_table[IMAR_HASH(space, name)];
+		imarb_lock(bucket);
+
+		marequest->imar_next = bucket->imarb_head;
+		bucket->imarb_head = marequest;
+
+		imarb_unlock(bucket);
+	} else {
+		if ((soright = ipc_port_lookup_notify(space, notify))
+								== IP_NULL) {
+			is_write_unlock(space);
+			imar_free(marequest);
+			return MACH_SEND_INVALID_NOTIFY;
+		}
+
+		is_reference(space);
+		marequest->imar_space = space;
+		marequest->imar_name = MACH_PORT_NULL;
+		marequest->imar_soright = soright;
+	}
+
+	is_write_unlock(space);
+	*marequestp = marequest;
+	return MACH_MSG_SUCCESS;
+}
+
+/*
+ *	Routine:	ipc_marequest_cancel
+ *	Purpose:
+ *		Cancel a msg-accepted request, because
+ *		the space's entry is being destroyed.
+ *	Conditions:
+ *		The space is write-locked and active.
+ */
+
+void
+ipc_marequest_cancel(
+	ipc_space_t space,
+	mach_port_name_t name)
+{
+	ipc_marequest_bucket_t bucket;
+	ipc_marequest_t marequest, *last;
+
+	assert(space->is_active);
+
+	bucket = &ipc_marequest_table[IMAR_HASH(space, name)];
+	imarb_lock(bucket);
+
+	for (last = &bucket->imarb_head;
+	     (marequest = *last) != IMAR_NULL;
+	     last = &marequest->imar_next)
+		if ((marequest->imar_space == space) &&
+		    (marequest->imar_name == name))
+			break;
+
+	assert(marequest != IMAR_NULL);
+	*last = marequest->imar_next;
+	imarb_unlock(bucket);
+
+	marequest->imar_name = MACH_PORT_NAME_NULL;
+}
+
+/*
+ *	Routine:	ipc_marequest_rename
+ *	Purpose:
+ *		Rename a msg-accepted request, because the entry
+ *		in the space is being renamed.
+ *	Conditions:
+ *		The space is write-locked and active.
+ */
+
+void
+ipc_marequest_rename(
+	ipc_space_t space,
+	mach_port_name_t old, 
+	mach_port_name_t new)
+{
+	ipc_marequest_bucket_t bucket;
+	ipc_marequest_t marequest, *last;
+
+	assert(space->is_active);
+
+	bucket = &ipc_marequest_table[IMAR_HASH(space, old)];
+	imarb_lock(bucket);
+
+	for (last = &bucket->imarb_head;
+	     (marequest = *last) != IMAR_NULL;
+	     last = &marequest->imar_next)
+		if ((marequest->imar_space == space) &&
+		    (marequest->imar_name == old))
+			break;
+
+	assert(marequest != IMAR_NULL);
+	*last = marequest->imar_next;
+	imarb_unlock(bucket);
+
+	marequest->imar_name = new;
+
+	bucket = &ipc_marequest_table[IMAR_HASH(space, new)];
+	imarb_lock(bucket);
+
+	marequest->imar_next = bucket->imarb_head;
+	bucket->imarb_head = marequest;
+
+	imarb_unlock(bucket);
+}
+
+/*
+ *	Routine:	ipc_marequest_destroy
+ *	Purpose:
+ *		Destroy a msg-accepted request, because
+ *		the kernel message is being received/destroyed.
+ *	Conditions:
+ *		Nothing locked.
+ */
+
+void
+ipc_marequest_destroy(ipc_marequest_t marequest)
+{
+	ipc_space_t space = marequest->imar_space;
+	mach_port_name_t name;
+	ipc_port_t soright;
+
+	is_write_lock(space);
+
+	name = marequest->imar_name;
+	soright = marequest->imar_soright;
+
+	if (name != MACH_PORT_NULL) {
+		ipc_marequest_bucket_t bucket;
+		ipc_marequest_t this, *last;
+
+		bucket = &ipc_marequest_table[IMAR_HASH(space, name)];
+		imarb_lock(bucket);
+
+		for (last = &bucket->imarb_head;
+		     (this = *last) != IMAR_NULL;
+		     last = &this->imar_next)
+			if ((this->imar_space == space) &&
+			    (this->imar_name == name))
+				break;
+
+		assert(this == marequest);
+		*last = this->imar_next;
+		imarb_unlock(bucket);
+
+		if (space->is_active) {
+			ipc_entry_t entry;
+
+			entry = ipc_entry_lookup(space, name);
+			assert(entry != IE_NULL);
+			assert(entry->ie_bits & IE_BITS_MAREQUEST);
+			assert(entry->ie_bits & MACH_PORT_TYPE_SEND_RECEIVE);
+
+			entry->ie_bits &= ~IE_BITS_MAREQUEST;
+
+		} else
+			name = MACH_PORT_NAME_NULL;
+	}
+
+	is_write_unlock(space);
+	is_release(space);
+
+	imar_free(marequest);
+
+	assert(soright != IP_NULL);
+	ipc_notify_msg_accepted(soright, name);
+}
+
+#if	MACH_IPC_DEBUG
+
+
+/*
+ *	Routine:	ipc_marequest_info
+ *	Purpose:
+ *		Return information about the marequest hash table.
+ *		Fills the buffer with as much information as possible
+ *		and returns the desired size of the buffer.
+ *	Conditions:
+ *		Nothing locked.  The caller should provide
+ *		possibly-pageable memory.
+ */
+
+unsigned int
+ipc_marequest_info(
+	unsigned int 		*maxp,
+	hash_info_bucket_t 	*info,
+	unsigned int 		count)
+{
+	ipc_marequest_index_t i;
+
+	if (ipc_marequest_size < count)
+		count = ipc_marequest_size;
+
+	for (i = 0; i < count; i++) {
+		ipc_marequest_bucket_t bucket = &ipc_marequest_table[i];
+		unsigned int bucket_count = 0;
+		ipc_marequest_t marequest;
+
+		imarb_lock(bucket);
+		for (marequest = bucket->imarb_head;
+		     marequest != IMAR_NULL;
+		     marequest = marequest->imar_next)
+			bucket_count++;
+		imarb_unlock(bucket);
+
+		/* don't touch pageable memory while holding locks */
+		info[i].hib_count = bucket_count;
+	}
+
+	*maxp = (unsigned int)-1;
+	return ipc_marequest_size;
+}
+
+#endif	/* MACH_IPC_DEBUG */