117 lines
3.9 KiB
C
117 lines
3.9 KiB
C
/*
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* services/modstack.h - stack of modules
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains functions to help maintain a stack of modules.
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*/
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#ifndef SERVICES_MODSTACK_H
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#define SERVICES_MODSTACK_H
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struct module_func_block;
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struct module_env;
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/**
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* Stack of modules.
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*/
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struct module_stack {
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/** the number of modules */
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int num;
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/** the module callbacks, array of num_modules length (ref only) */
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struct module_func_block** mod;
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};
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/**
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* Init a stack of modules
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* @param stack: initialised as empty.
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*/
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void modstack_init(struct module_stack* stack);
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/**
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* Read config file module settings and set up the modfunc block
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* @param stack: the stack of modules (empty before call).
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* @param module_conf: string what modules to insert.
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* @return false on error
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*/
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int modstack_config(struct module_stack* stack, const char* module_conf);
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/**
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* Get funcblock for module name
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* @param str: string with module name. Advanced to next value on success.
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* The string is assumed whitespace separated list of module names.
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* @return funcblock or NULL on error.
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*/
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struct module_func_block* module_factory(const char** str);
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/**
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* Get list of modules available.
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* @return list of modules available. Static strings, ends with NULL.
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*/
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const char** module_list_avail(void);
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/**
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* Setup modules. Assigns ids and calls module_init.
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* @param stack: if not empty beforehand, it will be desetup()ed.
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* It is then modstack_configged().
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* @param module_conf: string what modules to insert.
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* @param env: module environment which is inited by the modules.
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* environment should have a superalloc, cfg,
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* env.need_to_validate is set by the modules.
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* @return on false a module init failed.
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*/
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int modstack_setup(struct module_stack* stack, const char* module_conf,
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struct module_env* env);
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/**
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* Desetup the modules, deinit, delete.
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* @param stack: made empty.
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* @param env: module env for module deinit() calls.
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*/
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void modstack_desetup(struct module_stack* stack, struct module_env* env);
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/**
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* Find index of module by name.
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* @param stack: to look in
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* @param name: the name to look for
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* @return -1 on failure, otherwise index number.
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*/
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int modstack_find(struct module_stack* stack, const char* name);
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/** fetch memory for a module by name, returns 0 if module not there */
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size_t mod_get_mem(struct module_env* env, const char* name);
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#endif /* SERVICES_MODSTACK_H */
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