118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file apr_optional_hooks.h
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* @brief Apache optional hook functions
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*/
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#ifndef APR_OPTIONAL_HOOK_H
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#define APR_OPTIONAL_HOOK_H
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#include "apr_tables.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @defgroup APR_Util_OPT_HOOK Optional Hook Functions
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* @ingroup APR_Util_Hook
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* @{
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*/
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/**
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* Function to implement the APR_OPTIONAL_HOOK Macro
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* @internal
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* @see APR_OPTIONAL_HOOK
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*
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* @param szName The name of the hook
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* @param pfn A pointer to a function that will be called
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* @param aszPre a NULL-terminated array of strings that name modules whose hooks should precede this one
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* @param aszSucc a NULL-terminated array of strings that name modules whose hooks should succeed this one
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* @param nOrder an integer determining order before honouring aszPre and aszSucc (for example HOOK_MIDDLE)
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*/
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APU_DECLARE(void) apr_optional_hook_add(const char *szName,void (*pfn)(void),
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const char * const *aszPre,
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const char * const *aszSucc,
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int nOrder);
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/**
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* Hook to an optional hook.
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*
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* @param ns The namespace prefix of the hook functions
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* @param name The name of the hook
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* @param pfn A pointer to a function that will be called
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* @param aszPre a NULL-terminated array of strings that name modules whose hooks should precede this one
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* @param aszSucc a NULL-terminated array of strings that name modules whose hooks should succeed this one
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* @param nOrder an integer determining order before honouring aszPre and aszSucc (for example HOOK_MIDDLE)
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*/
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#define APR_OPTIONAL_HOOK(ns,name,pfn,aszPre,aszSucc,nOrder) do { \
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ns##_HOOK_##name##_t *apu__hook = pfn; \
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apr_optional_hook_add(#name,(void (*)(void))apu__hook,aszPre, aszSucc, nOrder); \
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} while (0)
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/**
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* @internal
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* @param szName - the name of the function
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* @return the hook structure for a given hook
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*/
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APU_DECLARE(apr_array_header_t *) apr_optional_hook_get(const char *szName);
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/**
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* Implement an optional hook that runs until one of the functions
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* returns something other than OK or DECLINE.
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*
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* @param ns The namespace prefix of the hook functions
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* @param link The linkage declaration prefix of the hook
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* @param ret The type of the return value of the hook
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* @param ret The type of the return value of the hook
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* @param name The name of the hook
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* @param args_decl The declaration of the arguments for the hook
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* @param args_use The names for the arguments for the hook
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* @param ok Success value
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* @param decline Decline value
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*/
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#define APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ns,link,ret,name,args_decl,args_use,ok,decline) \
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link##_DECLARE(ret) ns##_run_##name args_decl \
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{ \
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ns##_LINK_##name##_t *pHook; \
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int n; \
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ret rv; \
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apr_array_header_t *pHookArray=apr_optional_hook_get(#name); \
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\
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if(!pHookArray) \
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return ok; \
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\
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pHook=(ns##_LINK_##name##_t *)pHookArray->elts; \
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for(n=0 ; n < pHookArray->nelts ; ++n) \
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{ \
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rv=(pHook[n].pFunc)args_use; \
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\
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if(rv != ok && rv != decline) \
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return rv; \
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} \
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return ok; \
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}
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/** @} */
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#ifdef __cplusplus
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}
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#endif
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#endif /* APR_OPTIONAL_HOOK_H */
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