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diff --git a/ipc/ipc_pset.h b/ipc/ipc_pset.h
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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_pset.h
+ *	Author:	Rich Draves
+ *	Date:	1989
+ *
+ *	Definitions for port sets.
+ */
+
+#ifndef	_IPC_IPC_PSET_H_
+#define _IPC_IPC_PSET_H_
+
+#include <mach/port.h>
+#include <mach/kern_return.h>
+#include <ipc/ipc_object.h>
+#include <ipc/ipc_mqueue.h>
+#include "ipc_target.h"
+
+typedef struct ipc_pset {
+	struct ipc_target ips_target;
+
+} *ipc_pset_t;
+
+#define ips_object		ips_target.ipt_object
+#define ips_local_name		ips_target.ipt_name
+#define ips_messages		ips_target.ipt_messages
+#define	ips_references		ips_object.io_references
+
+#define	IPS_NULL		((ipc_pset_t) IO_NULL)
+
+#define	ips_active(pset)	io_active(&(pset)->ips_object)
+#define	ips_lock(pset)		io_lock(&(pset)->ips_object)
+#define	ips_lock_try(pset)	io_lock_try(&(pset)->ips_object)
+#define	ips_unlock(pset)	io_unlock(&(pset)->ips_object)
+#define	ips_check_unlock(pset)	io_check_unlock(&(pset)->ips_object)
+#define	ips_reference(pset)	io_reference(&(pset)->ips_object)
+#define	ips_release(pset)	io_release(&(pset)->ips_object)
+
+extern kern_return_t
+ipc_pset_alloc(ipc_space_t, mach_port_name_t *, ipc_pset_t *);
+
+extern kern_return_t
+ipc_pset_alloc_name(ipc_space_t, mach_port_name_t, ipc_pset_t *);
+
+extern void
+ipc_pset_add(ipc_pset_t, ipc_port_t);
+
+extern void
+ipc_pset_remove(ipc_pset_t, ipc_port_t);
+
+extern kern_return_t
+ipc_pset_move(ipc_space_t, ipc_port_t, ipc_pset_t);
+
+extern void
+ipc_pset_destroy(ipc_pset_t);
+
+#define	ipc_pset_reference(pset)	\
+		ipc_object_reference(&(pset)->ips_object)
+
+#define	ipc_pset_release(pset)		\
+		ipc_object_release(&(pset)->ips_object)
+
+#endif	/* _IPC_IPC_PSET_H_ */