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diff --git a/libshouldbeinlibc/portxlate.h b/libshouldbeinlibc/portxlate.h
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+/* Translate mach port names between two tasks
+
+   Copyright (C) 1996 Free Software Foundation, Inc.
+
+   Written by Miles Bader <miles@gnu.ai.mit.edu>
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#ifndef __PORTXLATE_H__
+#define __PORTXLATE_H__
+
+#include <errno.h>
+#include <mach.h>
+
+/* A data structure specifying two tasks, and info used to translate port
+   names between them.  */
+struct port_name_xlator
+{
+  /* The tasks between which we are translating port names.  */
+  mach_port_t from_task;
+  mach_port_t to_task;
+
+  /* True if we're translating receive rights in FROM_TASK; otherwise, we're
+     translating send rights.  */
+  int from_is_receive;
+
+  /* Arrays of port names and type masks from TO_TASK, fetched by
+     mach_port_names.  These are vm_allocated.  */
+  mach_port_t *to_names;
+  mach_msg_type_number_t to_names_len;
+  mach_port_type_t *to_types;
+  mach_msg_type_number_t to_types_len;
+
+  /* An array of rights in the current task to the ports in TO_NAMES/TO_TASK,
+     or MACH_PORT_NULL, indicating that none has been fetched yet.
+     This vector is malloced.  */
+  mach_port_t *ports;
+};
+
+/* Return a new port name translator translating names between FROM_TASK and
+   TO_TASK, in XLATOR, or an error.  */
+error_t port_name_xlator_create (mach_port_t from_task, mach_port_t to_task,
+				 struct port_name_xlator **xlator);
+
+/* Free the port name translator X and any resources it holds.  */
+void port_name_xlator_free (struct port_name_xlator *x);
+
+/* Translate the port FROM between the tasks in X, returning the translated
+   name in TO, and the types of TO in TO_TYPE, or an error.  If TYPE is
+   non-zero, it should be what mach_port_type returns for FROM.  */
+error_t port_name_xlator_xlate (struct port_name_xlator *x,
+				mach_port_t from, mach_port_type_t from_type,
+				mach_port_t *to, mach_port_type_t *to_type);
+
+#endif /* __PORTXLATE_H__ */