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diff --git a/set-hooks.h b/set-hooks.h
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+/* Macros for using symbol sets for running lists of functions.
+Copyright (C) 1994, 1995 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.  */
+
+#ifndef _SET_HOOKS_H
+
+#define __need_size_t
+#include <stddef.h>
+#include <sys/cdefs.h>
+
+/* Define a hook variable called NAME.  Functions put on this hook take
+   arguments described by PROTO.  Use `text_set_element (NAME, FUNCTION)'
+   from gnu-stabs.h to add a function to the hook.  */
+
+#define DEFINE_HOOK(NAME, PROTO)		\
+  typedef void __##NAME##_hook_function_t PROTO; \
+  symbol_set_define (NAME)
+
+#define DECLARE_HOOK(NAME, PROTO)		\
+  typedef void __##NAME##_hook_function_t PROTO;\
+  symbol_set_declare (NAME)
+
+/* Run all the functions hooked on the set called NAME.
+   Each function is called like this: `function ARGS'.  */
+
+#define RUN_HOOK(NAME, ARGS) \
+do {									      \
+  void *const *ptr;							      \
+  for (ptr = symbol_set_first_element (NAME);				      \
+       ! symbol_set_end_p (NAME, ptr); ++ptr)				      \
+    (*(__##NAME##_hook_function_t *) *ptr) ARGS;			      \
+} while (0)
+
+/* Define a hook variable with NAME and PROTO, and a function called RUNNER
+   which calls each function on the hook in turn, with ARGS.  */
+
+#define DEFINE_HOOK_RUNNER(name, runner, proto, args) \
+DEFINE_HOOK (name, proto); void runner proto { RUN_HOOK (name, args); }
+
+
+#endif