include/ap_config.h

   1 /* Licensed to the Apache Software Foundation (ASF) under one or more
   2  * contributor license agreements.  See the NOTICE file distributed with
   3  * this work for additional information regarding copyright ownership.
   4  * The ASF licenses this file to You under the Apache License, Version 2.0
   5  * (the "License"); you may not use this file except in compliance with
   6  * the License.  You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 /**
  18  * @file ap_config.h
  19  * @brief Symbol export macros and hook functions
  20  */
  21
  22 #ifndef AP_CONFIG_H
  23 #define AP_CONFIG_H
  24
  25 #include "apr.h"
  26 #include "apr_hooks.h"
  27 #include "apr_optional_hooks.h"
  28
  29 /* Although this file doesn't declare any hooks, declare the hook group here */
  30 /**
  31  * @defgroup hooks Apache Hooks
  32  * @ingroup  APACHE_CORE
  33  */
  34
  35 #ifdef DOXYGEN
  36 /* define these just so doxygen documents them */
  37
  38 /**
  39  * AP_DECLARE_STATIC is defined when including Apache's Core headers,
  40  * to provide static linkage when the dynamic library may be unavailable.
  41  *
  42  * @see AP_DECLARE_EXPORT
  43  *
  44  * AP_DECLARE_STATIC and AP_DECLARE_EXPORT are left undefined when
  45  * including Apache's Core headers, to import and link the symbols from the
  46  * dynamic Apache Core library and assure appropriate indirection and calling
  47  * conventions at compile time.
  48  */
  49 # define AP_DECLARE_STATIC
  50 /**
  51  * AP_DECLARE_EXPORT is defined when building the Apache Core dynamic
  52  * library, so that all public symbols are exported.
  53  *
  54  * @see AP_DECLARE_STATIC
  55  */
  56 # define AP_DECLARE_EXPORT
  57
  58 #endif /* def DOXYGEN */
  59
  60 #if !defined(WIN32)
  61 /**
  62  * Apache Core dso functions are declared with AP_DECLARE(), so they may
  63  * use the most appropriate calling convention.  Hook functions and other
  64  * Core functions with variable arguments must use AP_DECLARE_NONSTD().
  65  * @code
  66  * AP_DECLARE(rettype) ap_func(args)
  67  * @endcode
  68  */
  69 #define AP_DECLARE(type)            type
  70
  71 /**
  72  * Apache Core dso variable argument and hook functions are declared with
  73  * AP_DECLARE_NONSTD(), as they must use the C language calling convention.
  74  * @see AP_DECLARE
  75  * @code
  76  * AP_DECLARE_NONSTD(rettype) ap_func(args [...])
  77  * @endcode
  78  */
  79 #define AP_DECLARE_NONSTD(type)     type
  80
  81 /**
  82  * Apache Core dso variables are declared with AP_MODULE_DECLARE_DATA.
  83  * This assures the appropriate indirection is invoked at compile time.
  84  *
  85  * @note AP_DECLARE_DATA extern type apr_variable; syntax is required for
  86  * declarations within headers to properly import the variable.
  87  * @code
  88  * AP_DECLARE_DATA type apr_variable
  89  * @endcode
  90  */
  91 #define AP_DECLARE_DATA
  92
  93 #elif defined(AP_DECLARE_STATIC)
  94 #define AP_DECLARE(type)            type __stdcall
  95 #define AP_DECLARE_NONSTD(type)     type
  96 #define AP_DECLARE_DATA
  97 #elif defined(AP_DECLARE_EXPORT)
  98 #define AP_DECLARE(type)            __declspec(dllexport) type __stdcall
  99 #define AP_DECLARE_NONSTD(type)     __declspec(dllexport) type
 100 #define AP_DECLARE_DATA             __declspec(dllexport)
 101 #else
 102 #define AP_DECLARE(type)            __declspec(dllimport) type __stdcall
 103 #define AP_DECLARE_NONSTD(type)     __declspec(dllimport) type
 104 #define AP_DECLARE_DATA             __declspec(dllimport)
 105 #endif
 106
 107 #if !defined(WIN32) || defined(AP_MODULE_DECLARE_STATIC)
 108 /**
 109  * Declare a dso module's exported module structure as AP_MODULE_DECLARE_DATA.
 110  *
 111  * Unless AP_MODULE_DECLARE_STATIC is defined at compile time, symbols
 112  * declared with AP_MODULE_DECLARE_DATA are always exported.
 113  * @code
 114  * module AP_MODULE_DECLARE_DATA mod_tag
 115  * @endcode
 116  */
 117 #if defined(WIN32)
 118 #define AP_MODULE_DECLARE(type)            type __stdcall
 119 #else
 120 #define AP_MODULE_DECLARE(type)            type
 121 #endif
 122 #define AP_MODULE_DECLARE_NONSTD(type)     type
 123 #define AP_MODULE_DECLARE_DATA
 124 #else
 125 /**
 126  * AP_MODULE_DECLARE_EXPORT is a no-op.  Unless contradicted by the
 127  * AP_MODULE_DECLARE_STATIC compile-time symbol, it is assumed and defined.
 128  *
 129  * The old SHARED_MODULE compile-time symbol is now the default behavior,
 130  * so it is no longer referenced anywhere with Apache 2.0.
 131  */
 132 #define AP_MODULE_DECLARE_EXPORT
 133 #define AP_MODULE_DECLARE(type)          __declspec(dllexport) type __stdcall
 134 #define AP_MODULE_DECLARE_NONSTD(type)   __declspec(dllexport) type
 135 #define AP_MODULE_DECLARE_DATA           __declspec(dllexport)
 136 #endif
 137
 138 /**
 139  * Declare a hook function
 140  * @param ret The return type of the hook
 141  * @param name The hook's name (as a literal)
 142  * @param args The arguments the hook function takes, in brackets.
 143  */
 144 #define AP_DECLARE_HOOK(ret,name,args) \
 145         APR_DECLARE_EXTERNAL_HOOK(ap,AP,ret,name,args)
 146
 147 /** @internal */
 148 #define AP_IMPLEMENT_HOOK_BASE(name) \
 149         APR_IMPLEMENT_EXTERNAL_HOOK_BASE(ap,AP,name)
 150
 151 /**
 152  * Implement an Apache core hook that has no return code, and
 153  * therefore runs all of the registered functions. The implementation
 154  * is called ap_run_<i>name</i>.
 155  *
 156  * @param name The name of the hook
 157  * @param args_decl The declaration of the arguments for the hook, for example
 158  * "(int x,void *y)"
 159  * @param args_use The arguments for the hook as used in a call, for example
 160  * "(x,y)"
 161  * @note If IMPLEMENTing a hook that is not linked into the Apache core,
 162  * (e.g. within a dso) see APR_IMPLEMENT_EXTERNAL_HOOK_VOID.
 163  */
 164 #define AP_IMPLEMENT_HOOK_VOID(name,args_decl,args_use) \
 165         APR_IMPLEMENT_EXTERNAL_HOOK_VOID(ap,AP,name,args_decl,args_use)
 166
 167 /**
 168  * Implement an Apache core hook that runs until one of the functions
 169  * returns something other than ok or decline. That return value is
 170  * then returned from the hook runner. If the hooks run to completion,
 171  * then ok is returned. Note that if no hook runs it would probably be
 172  * more correct to return decline, but this currently does not do
 173  * so. The implementation is called ap_run_<i>name</i>.
 174  *
 175  * @param ret The return type of the hook (and the hook runner)
 176  * @param name The name of the hook
 177  * @param args_decl The declaration of the arguments for the hook, for example
 178  * "(int x,void *y)"
 179  * @param args_use The arguments for the hook as used in a call, for example
 180  * "(x,y)"
 181  * @param ok The "ok" return value
 182  * @param decline The "decline" return value
 183  * @return ok, decline or an error.
 184  * @note If IMPLEMENTing a hook that is not linked into the Apache core,
 185  * (e.g. within a dso) see APR_IMPLEMENT_EXTERNAL_HOOK_RUN_ALL.
 186  */
 187 #define AP_IMPLEMENT_HOOK_RUN_ALL(ret,name,args_decl,args_use,ok,decline) \
 188         APR_IMPLEMENT_EXTERNAL_HOOK_RUN_ALL(ap,AP,ret,name,args_decl, \
 189                                             args_use,ok,decline)
 190
 191 /**
 192  * Implement a hook that runs until a function returns something other than
 193  * decline. If all functions return decline, the hook runner returns decline.
 194  * The implementation is called ap_run_<i>name</i>.
 195  *
 196  * @param ret The return type of the hook (and the hook runner)
 197  * @param name The name of the hook
 198  * @param args_decl The declaration of the arguments for the hook, for example
 199  * "(int x,void *y)"
 200  * @param args_use The arguments for the hook as used in a call, for example
 201  * "(x,y)"
 202  * @param decline The "decline" return value
 203  * @return decline or an error.
 204  * @note If IMPLEMENTing a hook that is not linked into the Apache core
 205  * (e.g. within a dso) see APR_IMPLEMENT_EXTERNAL_HOOK_RUN_FIRST.
 206  */
 207 #define AP_IMPLEMENT_HOOK_RUN_FIRST(ret,name,args_decl,args_use,decline) \
 208         APR_IMPLEMENT_EXTERNAL_HOOK_RUN_FIRST(ap,AP,ret,name,args_decl, \
 209                                               args_use,decline)
 210
 211 /* Note that the other optional hook implementations are straightforward but
 212  * have not yet been needed
 213  */
 214
 215 /**
 216  * Implement an optional hook. This is exactly the same as a standard hook
 217  * implementation, except the hook is optional.
 218  * @see AP_IMPLEMENT_HOOK_RUN_ALL
 219  */
 220 #define AP_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ret,name,args_decl,args_use,ok, \
 221                                            decline) \
 222         APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ap,AP,ret,name,args_decl, \
 223                                             args_use,ok,decline)
 224
 225 /**
 226  * Hook an optional hook. Unlike static hooks, this uses a macro instead of a
 227  * function.
 228  */
 229 #define AP_OPTIONAL_HOOK(name,fn,pre,succ,order) \
 230         APR_OPTIONAL_HOOK(ap,name,fn,pre,succ,order)
 231
 232 #include "os.h"
 233 #if (!defined(WIN32) && !defined(NETWARE)) || defined(__MINGW32__)
 234 #include "ap_config_auto.h"
 235 #include "ap_config_layout.h"
 236 #endif
 237 #if defined(NETWARE)
 238 #define AP_NONBLOCK_WHEN_MULTI_LISTEN 1
 239 #endif
 240
 241 #if AP_ENABLE_DTRACE && HAVE_SYS_SDT_H
 242 #include <sys/sdt.h>
 243 #else
 244 #undef _DTRACE_VERSION
 245 #endif
 246
 247 #ifdef _DTRACE_VERSION
 248 #include "apache_probes.h"
 249 #else
 250 #include "apache_noprobes.h"
 251 #endif
 252
 253 /* TODO - We need to put OS detection back to make all the following work */
 254
 255 #if defined(SUNOS4) || defined(IRIX) || defined(NEXT) || defined(AUX3) \
 256     || defined (UW) || defined(LYNXOS) || defined(TPF)
 257 /* These systems don't do well with any lingering close code; I don't know
 258  * why -- manoj */
 259 #define NO_LINGCLOSE
 260 #endif
 261
 262 /* If APR has OTHER_CHILD logic, use reliable piped logs. */
 263 #if APR_HAS_OTHER_CHILD
 264 #define AP_HAVE_RELIABLE_PIPED_LOGS TRUE
 265 #endif
 266
 267 /* Presume that the compiler supports C99-style designated
 268  * initializers if using GCC (but not G++), or for any other compiler
 269  * which claims C99 support. */
 270 #if (defined(__GNUC__) && !defined(__cplusplus))                \
 271      || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L)
 272 #define AP_HAVE_DESIGNATED_INITIALIZER
 273 #endif
 274
 275 #endif /* AP_CONFIG_H */