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diff --git a/mach/mach/mach_traps.h b/mach/mach/mach_traps.h
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+++ b/mach/mach/mach_traps.h
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+/* Copyright (C) 1994 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+/* Declare the few Mach system calls (except mach_msg, in <mach/message.h>).
+   This does not include the kernel RPC shortcut calls (in <mach-shortcuts.h>).
+
+   This file omits the MACH_IPC_COMPAT functions.  */
+
+#ifndef	_MACH_MACH_TRAPS_H
+
+#define _MACH_MACH_TRAPS_H_	1
+
+#include <mach/port.h>
+
+
+/* Create and return a new receive right.  */
+extern mach_port_t mach_reply_port (void);
+extern mach_port_t __mach_reply_port (void);
+
+/* Return the thread control port for the calling thread.  */
+extern mach_port_t mach_thread_self (void);
+extern mach_port_t __mach_thread_self (void);
+
+/* Return the task control port for the calling task.
+   The parens are needed to protect against the macro in <mach_init.h>.  */
+extern mach_port_t (mach_task_self) (void);
+extern mach_port_t (__mach_task_self) (void);
+
+/* Return the host information port for the host of the calling task.  */
+extern mach_port_t mach_host_self (void);
+extern mach_port_t __mach_host_self (void);
+
+/* Attempt to context switch the current thread off the processor.  Returns
+   true if there are other threads that can be run and false if not.  */
+extern boolean_t swtch (void);
+extern boolean_t __swtch (void);
+
+/* Attempt to context switch the current thread off the processor.  Lower
+   the thread's priority as much as possible.  The thread's priority will
+   be restored when it runs again.  PRIORITY is currently unused.  Return 
+   true if there are other threads that can be run and false if not.  */
+extern boolean_t swtch_pri (int priority);
+extern boolean_t __swtch_pri (int priority);
+
+/* Attempt to context switch the current thread of the rpocessor.  Try
+   to run NEW_THREAD next, ignoring normal scheduling policies.  The
+   OPTION value comes from <mach/thread_switch.h>.  If OPTION is
+   SWITCH_OPTION_WAIT, then block the current thread for TIME
+   milliseconds.  If OPTION is SWITCH_OPTION_DEPRESS, then block for
+   TIME milliseconds and depress the thread's priority as done by
+   swtch_pri.  If OPTION is SWITCH_OPTION_NONE, ignore TIME.  */
+kern_return_t thread_switch (mach_port_t new_thread, int option, int time);
+kern_return_t __thread_switch (mach_port_t new_thread, int option, int time);
+
+/* Block the current thread until the kernel (or device) event 
+   identified by EVENT occurs.  */
+kern_return_t evc_wait (unsigned int event);
+kern_return_t __evc_wait (unsigned int event);
+
+
+#endif	/* mach/mach_traps.h */