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