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28f540f4 | 1 | /* Macros for using symbol sets for running lists of functions. |
f7a9f785 | 2 | Copyright (C) 1994-2016 Free Software Foundation, Inc. |
5107cf1d | 3 | This file is part of the GNU C Library. |
28f540f4 | 4 | |
5107cf1d | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 9 | |
5107cf1d UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
28f540f4 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 RM |
18 | |
19 | #ifndef _SET_HOOKS_H | |
5107cf1d | 20 | #define _SET_HOOKS_H 1 |
28f540f4 RM |
21 | |
22 | #define __need_size_t | |
23 | #include <stddef.h> | |
24 | #include <sys/cdefs.h> | |
25 | ||
a808d541 | 26 | #ifdef symbol_set_define |
28f540f4 RM |
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 | ||
a808d541 | 31 | # define DEFINE_HOOK(NAME, PROTO) \ |
28f540f4 RM |
32 | typedef void __##NAME##_hook_function_t PROTO; \ |
33 | symbol_set_define (NAME) | |
34 | ||
a808d541 | 35 | # define DECLARE_HOOK(NAME, PROTO) \ |
28f540f4 RM |
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 | ||
dd9423a6 UD |
42 | # define RUN_HOOK(NAME, ARGS) \ |
43 | do { \ | |
70d9946a | 44 | void *const *ptr; \ |
dd9423a6 UD |
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; \ | |
28f540f4 RM |
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 | ||
a808d541 | 53 | # define DEFINE_HOOK_RUNNER(name, runner, proto, args) \ |
17427edd UD |
54 | DEFINE_HOOK (name, proto); \ |
55 | extern void runner proto; void runner proto { RUN_HOOK (name, args); } | |
28f540f4 | 56 | |
a808d541 UD |
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 | |
28f540f4 | 69 | |
5107cf1d | 70 | #endif /* set-hooks.h */ |