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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 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 */