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[glibc.git] / include / set-hooks.h
blob709f4c0a612e5b9f19b4998faf50274f64556002
1 /* Macros for using symbol sets for running lists of functions.
2 Copyright (C) 1994, 1995, 1997, 2000 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #ifndef _SET_HOOKS_H
21 #define _SET_HOOKS_H 1
23 #define __need_size_t
24 #include <stddef.h>
25 #include <sys/cdefs.h>
27 #ifdef symbol_set_define
28 /* Define a hook variable called NAME. Functions put on this hook take
29 arguments described by PROTO. Use `text_set_element (NAME, FUNCTION)'
30 from gnu-stabs.h to add a function to the hook. */
32 # define DEFINE_HOOK(NAME, PROTO) \
33 typedef void __##NAME##_hook_function_t PROTO; \
34 symbol_set_define (NAME)
36 # define DECLARE_HOOK(NAME, PROTO) \
37 typedef void __##NAME##_hook_function_t PROTO;\
38 symbol_set_declare (NAME)
40 /* Run all the functions hooked on the set called NAME.
41 Each function is called like this: `function ARGS'. */
43 # define RUN_HOOK(NAME, ARGS) \
44 do { \
45 void *const *__unbounded ptr; \
46 for (ptr = symbol_set_first_element (NAME); \
47 ! symbol_set_end_p (NAME, ptr); ++ptr) \
48 (*(__##NAME##_hook_function_t *) *ptr) ARGS; \
49 } while (0)
51 /* Define a hook variable with NAME and PROTO, and a function called RUNNER
52 which calls each function on the hook in turn, with ARGS. */
54 # define DEFINE_HOOK_RUNNER(name, runner, proto, args) \
55 DEFINE_HOOK (name, proto); void runner proto { RUN_HOOK (name, args); }
57 #else
59 /* The system does not provide necessary support for this. */
60 # define DEFINE_HOOK(NAME, PROTO)
62 # define DECLARE_HOOK(NAME, PROTO)
64 # define RUN_HOOK(NAME, ARGS)
66 # define DEFINE_HOOK_RUNNER(name, runner, proto, args)
68 #endif
70 #endif /* set-hooks.h */