/* Macros for using symbol sets for running lists of functions.

   Copyright (C) 1994-2018 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 Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#ifndef _SET_HOOKS_H

#define _SET_HOOKS_H 1

#define __need_size_t

#include <stddef.h>

#include <sys/cdefs.h>

#include <libc-symbols.h>

#ifdef symbol_set_define

/* Define a hook variable called NAME.  Functions put on this hook take

   arguments described by PROTO.  Use `text_set_element (NAME, FUNCTION)'

   from include/libc-symbols.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 = (void *const *) 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); \

extern void runner proto; void runner proto { RUN_HOOK (name, args); }

#else

/* The system does not provide necessary support for this.  */

# define DEFINE_HOOK(NAME, PROTO)

# define DECLARE_HOOK(NAME, PROTO)

# define RUN_HOOK(NAME, ARGS)

# define DEFINE_HOOK_RUNNER(name, runner, proto, args)

#endif

#endif /* set-hooks.h */