1/* Macros for using symbol sets for running lists of functions.
2 Copyright (C) 1994-2018 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#ifndef _SET_HOOKS_H
20#define _SET_HOOKS_H 1
21
22#define __need_size_t
23#include <stddef.h>
24#include <sys/cdefs.h>
25
26#ifdef symbol_set_define
27/* Define a hook variable called NAME. Functions put on this hook take
28 arguments described by PROTO. Use `text_set_element (NAME, FUNCTION)'
29 from gnu-stabs.h to add a function to the hook. */
30
31# define DEFINE_HOOK(NAME, PROTO) \
32 typedef void __##NAME##_hook_function_t PROTO; \
33 symbol_set_define (NAME)
34
35# define DECLARE_HOOK(NAME, PROTO) \
36 typedef void __##NAME##_hook_function_t PROTO;\
37 symbol_set_declare (NAME)
38
39/* Run all the functions hooked on the set called NAME.
40 Each function is called like this: `function ARGS'. */
41
42# define RUN_HOOK(NAME, ARGS) \
43do { \
44 void *const *ptr; \
45 for (ptr = (void *const *) symbol_set_first_element (NAME); \
46 ! symbol_set_end_p (NAME, ptr); ++ptr) \
47 (*(__##NAME##_hook_function_t *) *ptr) ARGS; \
48} while (0)
49
50/* Define a hook variable with NAME and PROTO, and a function called RUNNER
51 which calls each function on the hook in turn, with ARGS. */
52
53# define DEFINE_HOOK_RUNNER(name, runner, proto, args) \
54DEFINE_HOOK (name, proto); \
55extern void runner proto; void runner proto { RUN_HOOK (name, args); }
56
57#else
58
59/* The system does not provide necessary support for this. */
60# define DEFINE_HOOK(NAME, PROTO)
61
62# define DECLARE_HOOK(NAME, PROTO)
63
64# define RUN_HOOK(NAME, ARGS)
65
66# define DEFINE_HOOK_RUNNER(name, runner, proto, args)
67
68#endif
69
70#endif /* set-hooks.h */
71