72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
/* Macros for using symbol sets for running lists of functions.
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Copyright (C) 1994-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _SET_HOOKS_H
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#define _SET_HOOKS_H 1
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#define __need_size_t
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#include <stddef.h>
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#include <sys/cdefs.h>
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#include <libc-symbols.h>
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#ifdef symbol_set_define
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/* Define a hook variable called NAME. Functions put on this hook take
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arguments described by PROTO. Use `text_set_element (NAME, FUNCTION)'
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from include/libc-symbols.h to add a function to the hook. */
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# define DEFINE_HOOK(NAME, PROTO) \
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typedef void __##NAME##_hook_function_t PROTO; \
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symbol_set_define (NAME)
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# define DECLARE_HOOK(NAME, PROTO) \
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typedef void __##NAME##_hook_function_t PROTO;\
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symbol_set_declare (NAME)
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/* Run all the functions hooked on the set called NAME.
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Each function is called like this: `function ARGS'. */
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# define RUN_HOOK(NAME, ARGS) \
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do { \
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void *const *ptr; \
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for (ptr = (void *const *) symbol_set_first_element (NAME); \
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! symbol_set_end_p (NAME, ptr); ++ptr) \
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(*(__##NAME##_hook_function_t *) *ptr) ARGS; \
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} while (0)
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/* Define a hook variable with NAME and PROTO, and a function called RUNNER
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which calls each function on the hook in turn, with ARGS. */
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# define DEFINE_HOOK_RUNNER(name, runner, proto, args) \
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DEFINE_HOOK (name, proto); \
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extern void runner proto; void runner proto { RUN_HOOK (name, args); }
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#else
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/* The system does not provide necessary support for this. */
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# define DEFINE_HOOK(NAME, PROTO)
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# define DECLARE_HOOK(NAME, PROTO)
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# define RUN_HOOK(NAME, ARGS)
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# define DEFINE_HOOK_RUNNER(name, runner, proto, args)
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#endif
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#endif /* set-hooks.h */
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