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Edit File: ap_hooks.h

/* 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 ap_hooks.h * @brief ap hook functions and macros */ #ifndef AP_HOOKS_H #define AP_HOOKS_H /* Although this file doesn't declare any hooks, declare the hook group here */ /** * @defgroup hooks Apache Hooks * @ingroup APACHE_CORE */ #if defined(AP_HOOK_PROBES_ENABLED) && !defined(APR_HOOK_PROBES_ENABLED) #define APR_HOOK_PROBES_ENABLED 1 #endif #ifdef APR_HOOK_PROBES_ENABLED #include "ap_hook_probes.h" #endif #include "apr.h" #include "apr_hooks.h" #include "apr_optional_hooks.h" #ifdef DOXYGEN /* define these just so doxygen documents them */ /** * AP_DECLARE_STATIC is defined when including Apache's Core headers, * to provide static linkage when the dynamic library may be unavailable. * * @see AP_DECLARE_EXPORT * * AP_DECLARE_STATIC and AP_DECLARE_EXPORT are left undefined when * including Apache's Core headers, to import and link the symbols from the * dynamic Apache Core library and assure appropriate indirection and calling * conventions at compile time. */ # define AP_DECLARE_STATIC /** * AP_DECLARE_EXPORT is defined when building the Apache Core dynamic * library, so that all public symbols are exported. * * @see AP_DECLARE_STATIC */ # define AP_DECLARE_EXPORT #endif /* def DOXYGEN */ /** * Declare a hook function * @param ret The return type of the hook * @param name The hook's name (as a literal) * @param args The arguments the hook function takes, in brackets. */ #define AP_DECLARE_HOOK(ret,name,args) \ APR_DECLARE_EXTERNAL_HOOK(ap,AP,ret,name,args) /** @internal */ #define AP_IMPLEMENT_HOOK_BASE(name) \ APR_IMPLEMENT_EXTERNAL_HOOK_BASE(ap,AP,name) /** * Implement an Apache core hook that has no return code, and * therefore runs all of the registered functions. The implementation * is called ap_run_<i>name</i>. * * @param name The name of the hook * @param args_decl The declaration of the arguments for the hook, for example * "(int x,void *y)" * @param args_use The arguments for the hook as used in a call, for example * "(x,y)" * @note If IMPLEMENTing a hook that is not linked into the Apache core, * (e.g. within a dso) see APR_IMPLEMENT_EXTERNAL_HOOK_VOID. */ #define AP_IMPLEMENT_HOOK_VOID(name,args_decl,args_use) \ APR_IMPLEMENT_EXTERNAL_HOOK_VOID(ap,AP,name,args_decl,args_use) /** * Implement an Apache core hook that runs until one of the functions * returns something other than ok or decline. That return value is * then returned from the hook runner. If the hooks run to completion, * then ok is returned. Note that if no hook runs it would probably be * more correct to return decline, but this currently does not do * so. The implementation is called ap_run_<i>name</i>. * * @param ret The return type of the hook (and the hook runner) * @param name The name of the hook * @param args_decl The declaration of the arguments for the hook, for example * "(int x,void *y)" * @param args_use The arguments for the hook as used in a call, for example * "(x,y)" * @param ok The "ok" return value * @param decline The "decline" return value * @return ok, decline or an error. * @note If IMPLEMENTing a hook that is not linked into the Apache core, * (e.g. within a dso) see APR_IMPLEMENT_EXTERNAL_HOOK_RUN_ALL. */ #define AP_IMPLEMENT_HOOK_RUN_ALL(ret,name,args_decl,args_use,ok,decline) \ APR_IMPLEMENT_EXTERNAL_HOOK_RUN_ALL(ap,AP,ret,name,args_decl, \ args_use,ok,decline) /** * Implement a hook that runs until a function returns something other than * decline. If all functions return decline, the hook runner returns decline. * The implementation is called ap_run_<i>name</i>. * * @param ret The return type of the hook (and the hook runner) * @param name The name of the hook * @param args_decl The declaration of the arguments for the hook, for example * "(int x,void *y)" * @param args_use The arguments for the hook as used in a call, for example * "(x,y)" * @param decline The "decline" return value * @return decline or an error. * @note If IMPLEMENTing a hook that is not linked into the Apache core * (e.g. within a dso) see APR_IMPLEMENT_EXTERNAL_HOOK_RUN_FIRST. */ #define AP_IMPLEMENT_HOOK_RUN_FIRST(ret,name,args_decl,args_use,decline) \ APR_IMPLEMENT_EXTERNAL_HOOK_RUN_FIRST(ap,AP,ret,name,args_decl, \ args_use,decline) /* Note that the other optional hook implementations are straightforward but * have not yet been needed */ /** * Implement an optional hook. This is exactly the same as a standard hook * implementation, except the hook is optional. * @see AP_IMPLEMENT_HOOK_RUN_ALL */ #define AP_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ret,name,args_decl,args_use,ok, \ decline) \ APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ap,AP,ret,name,args_decl, \ args_use,ok,decline) /** * Hook an optional hook. Unlike static hooks, this uses a macro instead of a * function. */ #define AP_OPTIONAL_HOOK(name,fn,pre,succ,order) \ APR_OPTIONAL_HOOK(ap,name,fn,pre,succ,order) #endif /* AP_HOOKS_H */