include/ap_config.h

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000-2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

#ifndef AP_CONFIG_H
#define AP_CONFIG_H

#include "apr.h"
#include "apr_hooks.h"
#include "apr_optional_hooks.h"

/**
 * @file ap_config.h
 * @brief Symbol export macros and hook functions
 */

/* Although this file doesn't declare any hooks, declare the hook group here */
/** @defgroup hooks Apache Hooks */

#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 */

#if !defined(WIN32)
/**
 * Apache Core dso functions are declared with AP_DECLARE(), so they may
 * use the most appropriate calling convention.  Hook functions and other
 * Core functions with variable arguments must use AP_DECLARE_NONSTD().
 * @code
 * AP_DECLARE(rettype) ap_func(args)
 * @endcode
 */
#define AP_DECLARE(type)            type

/**
 * Apache Core dso variable argument and hook functions are declared with 
 * AP_DECLARE_NONSTD(), as they must use the C language calling convention.
 * @see AP_DECLARE
 * @code
 * AP_DECLARE_NONSTD(rettype) ap_func(args [...])
 * @endcode
 */
#define AP_DECLARE_NONSTD(type)     type

/**
 * Apache Core dso variables are declared with AP_MODULE_DECLARE_DATA.
 * This assures the appropriate indirection is invoked at compile time.
 *
 * @note AP_DECLARE_DATA extern type apr_variable; syntax is required for
 * declarations within headers to properly import the variable.
 * @code
 * AP_DECLARE_DATA type apr_variable
 * @endcode
 */
#define AP_DECLARE_DATA

#elif defined(AP_DECLARE_STATIC)
#define AP_DECLARE(type)            type __stdcall
#define AP_DECLARE_NONSTD(type)     type
#define AP_DECLARE_DATA
#elif defined(AP_DECLARE_EXPORT)
#define AP_DECLARE(type)            __declspec(dllexport) type __stdcall
#define AP_DECLARE_NONSTD(type)     __declspec(dllexport) type
#define AP_DECLARE_DATA             __declspec(dllexport)
#else
#define AP_DECLARE(type)            __declspec(dllimport) type __stdcall
#define AP_DECLARE_NONSTD(type)     __declspec(dllimport) type
#define AP_DECLARE_DATA             __declspec(dllimport)
#endif

#if !defined(WIN32) || defined(AP_MODULE_DECLARE_STATIC)
/**
 * Declare a dso module's exported module structure as AP_MODULE_DECLARE_DATA.
 *
 * Unless AP_MODULE_DECLARE_STATIC is defined at compile time, symbols 
 * declared with AP_MODULE_DECLARE_DATA are always exported.
 * @code
 * module AP_MODULE_DECLARE_DATA mod_tag
 * @endcode
 */
#if defined(WIN32)
#define AP_MODULE_DECLARE(type)            type __stdcall
#else
#define AP_MODULE_DECLARE(type)            type
#endif
#define AP_MODULE_DECLARE_NONSTD(type)     type
#define AP_MODULE_DECLARE_DATA
#else
/**
 * AP_MODULE_DECLARE_EXPORT is a no-op.  Unless contradicted by the
 * AP_MODULE_DECLARE_STATIC compile-time symbol, it is assumed and defined.
 *
 * The old SHARED_MODULE compile-time symbol is now the default behavior, 
 * so it is no longer referenced anywhere with Apache 2.0.
 */
#define AP_MODULE_DECLARE_EXPORT
#define AP_MODULE_DECLARE(type)          __declspec(dllexport) type __stdcall
#define AP_MODULE_DECLARE_NONSTD(type)   __declspec(dllexport) type
#define AP_MODULE_DECLARE_DATA           __declspec(dllexport)
#endif

/**
 * 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 the first function that 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)

#include "os.h"
#if !defined(WIN32) && !defined(NETWARE)
#include "ap_config_auto.h"
#endif


/* TODO - We need to put OS detection back to make all the following work */

#if defined(SUNOS4) || defined(IRIX) || defined(NEXT) || defined(AUX3) \
    || defined (UW) || defined(LYNXOS) || defined(TPF)
/* These systems don't do well with any lingering close code; I don't know
 * why -- manoj */
#define NO_LINGCLOSE
#endif

/* If APR has OTHER_CHILD logic, use reliable piped logs. */
#if APR_HAS_OTHER_CHILD
#define AP_HAVE_RELIABLE_PIPED_LOGS TRUE
#endif

#if APR_CHARSET_EBCDIC && !defined(APACHE_XLATE)
#define APACHE_XLATE
#endif

#endif /* AP_CONFIG_H */