定制的Apache2模块将不能与错误讯息和QUOT加载，无法定位API模块结构＆QUOT; [英] custom apache2 module will not load with error message "Can't locate API module structure"
问题描述
我是Windows开发者，但目前正试图在这篇文章中描述的生成使用apxs2工具，在linux上一个非常简单的Apache2模块：HTTP：//www.$c$cproject.com/Articles/491909/Apache- 2-X-模块多功能CPLUSPLUS-部分-1] [1]
模块正在成功打造，但不能加载某些原因。下面的错误在重新启动Apache问题：无法找到API模块结构
现在的一些细节。
所有想用下面的命令来构建模块的第一
apxs2 -i -a -c mod_pixmongo.cpp
它失败，错误信息，即无法确定引导符号名，而必须指定一个选项`-n'
在提供-n选项模块正在成功地构建：
apxs2 -i -a -n pixmongo -c mod_pixmongo.cpp
但是，试图重新启动以下错误Apache问题：
的Apache2：对/etc/apache2/mods-enabled/pixmongo.load第1行语法错误：在/etc/apache2/apache2.conf中的203行语法错误无法找到API模块结构`pixmongo_module在文件/usr/lib/apache2/modules/mod_pixmongo.so：/usr/lib/apache2/modules/mod_pixmongo.so：未定义的符号：pixmongo_module
行动configtest失败。
我知之甚少的Linux共享库，但建议该模块结构必须以某种方式出口。在我的理解下面的命令是为了显示导出符号：
纳米-D /usr/lib/apache2/modules/mod_pixmongo.so
在我的情况下，它显示以下内容：
W¯¯_Jv_RegisterClasses
0000000000200778一个__bss_start
W¯¯__cxa_finalize
W¯¯__gmon_start__
0000000000200778一个_edata
0000000000200788一个_end
0000000000000558ŧ_fini
0000000000000418ŧ_init
所以结构模块是不是真的有，我觉得它pretty奇怪。作为比较：其他pre-安装的模块有导出的结构。例如：
纳米-D /usr/lib/apache2/modules/mod_info.soW¯¯_Jv_RegisterClasses
00000000002052b0一个__bss_start
W¯¯__cxa_finalize
W¯¯__gmon_start__
00000000002052b0一个_edata
00000000002052c0一个_end
0000000000002b48ŧ_fini
0000000000001708ŧ_init
**************一长串这里*********
00000002050e0Ðinfo_module
üstrcasecmp
üSTRCMP
所以，问题是我做错了什么。
任何帮助是非常AP preciated。
样品模块的源$ C $ c是如下：
头文件mod_pixmongo.hpp：
的#ifndef MOD_PIXMONGO_HPP
＃定义MOD_PIXMONGO_HPP#IFDEF __cplusplus
＃定义EXTERN_C_BLOCK_BEGIN的externC{
＃定义EXTERN_C_BLOCK_END}
＃定义EXTERN_C_FUNC的externC
＃其他
＃定义EXTERN_C_BLOCK_BEGIN
＃定义EXTERN_C_BLOCK_END
＃定义EXTERN_C_FUNC
＃万一＃包括LT＆;＆httpd.h中GT;
＃包括LT＆;＆http_protocol.h GT;
＃包括LT＆;＆http_config.h GT;#ENDIF / * * MOD_PIXMONGO_HPP /
来源文件mod_pixmongo.cpp：
的#includemod_pixmongo.hppEXTERN_C_FUNC
INT pixmongo_handler（*的request_rec在prequest）
{
INT nReturnVal =下降;如果（在prequest-＆GT;！处理程序= NULL＆放大器;＆安培; STRCMP（以prequest-＆GT;处理程序，pixmongo）== 0）
{
ap_rputs（的Hello World从PIXMONGO，在prequest）;
nReturnVal = OK;
}返回nReturnVal;
}EXTERN_C_FUNC
无效pixmongo_hooks（apr_pool_t * inpPool）
{
ap_hook_handler（pixmongo_handler，NULL，NULL，APR_HOOK_MIDDLE）;
}EXTERN_C_BLOCK_BEGIN
模块AP_MODULE_DECLARE_DATA pixmongo_module =
{
STANDARD20_MODULE_STUFF，
空值，
空值，
空值，
空值，
空值，
pixmongo_hooks
};
EXTERN_C_BLOCK_END
我意识到我的错误。实用APXS不能够打造C ++模块，但只有C（后者为我工作的罚款）。在上述$ C $的CProject文章APXS工具仅用于部署已编译的模块，但不进行编译。
I'm a windows developer but now trying to build a very simple apache2 module on linux using apxs2 tool as described in this article: [http://www.codeproject.com/Articles/491909/Apache-2-x-Modules-In-Cplusplus-Part-1][1]
The module is being successfully build but cannot be loaded for some reason. Apache issues following error on restart: "Can't locate API module structure".
Now some details.
First of all trying to build the module with following command
apxs2 -i -a -c mod_pixmongo.cpp
It fails with error message that it "cannot determine bootstrap symbol name" and that one must "specify one with option `-n'"
When option -n is supplied the module is being successfully built:
apxs2 -i -a -n pixmongo -c mod_pixmongo.cpp
But an attempt to restart apache issues following error:
apache2: Syntax error on line 203 of /etc/apache2/apache2.conf: Syntax error on line 1 of /etc/apache2/mods-enabled/pixmongo.load: Can't locate API module structure `pixmongo_module' in file /usr/lib/apache2/modules/mod_pixmongo.so: /usr/lib/apache2/modules/mod_pixmongo.so: undefined symbol: pixmongo_module Action 'configtest' failed.
I know little about shared libraries on linux but suggest that the module structure must be somehow exported. Following command in my understanding is supposed to show exported symbols:
nm -D /usr/lib/apache2/modules/mod_pixmongo.so
In my case it shows following:
w _Jv_RegisterClasses
0000000000200778 A __bss_start
w __cxa_finalize
w __gmon_start__
0000000000200778 A _edata
0000000000200788 A _end
0000000000000558 T _fini
0000000000000418 T _init
So the structure "module" is really not there and I find it pretty strange. To compare: any other pre-installed module have that structure exported. For example:
nm -D /usr/lib/apache2/modules/mod_info.so
w _Jv_RegisterClasses
00000000002052b0 A __bss_start
w __cxa_finalize
w __gmon_start__
00000000002052b0 A _edata
00000000002052c0 A _end
0000000000002b48 T _fini
0000000000001708 T _init
************** the long list here *********
00000002050e0 D info_module
U strcasecmp
U strcmp
So the question is what I'm doing wrong. Any help is very much appreciated. The source code of the sample module is below:
Header file mod_pixmongo.hpp:
#ifndef MOD_PIXMONGO_HPP
#define MOD_PIXMONGO_HPP
#ifdef __cplusplus
#define EXTERN_C_BLOCK_BEGIN extern "C" {
#define EXTERN_C_BLOCK_END }
#define EXTERN_C_FUNC extern "C"
#else
#define EXTERN_C_BLOCK_BEGIN
#define EXTERN_C_BLOCK_END
#define EXTERN_C_FUNC
#endif
#include <httpd.h>
#include <http_protocol.h>
#include <http_config.h>
#endif /* MOD_PIXMONGO_HPP */
Source file mod_pixmongo.cpp:
#include "mod_pixmongo.hpp"
EXTERN_C_FUNC
int pixmongo_handler( request_rec* inpRequest )
{
int nReturnVal = DECLINED;
if ( inpRequest->handler != NULL && strcmp( inpRequest->handler, "pixmongo" ) == 0 )
{
ap_rputs( "Hello World from PIXMONGO", inpRequest );
nReturnVal = OK;
}
return nReturnVal;
}
EXTERN_C_FUNC
void pixmongo_hooks( apr_pool_t* inpPool )
{
ap_hook_handler( pixmongo_handler, NULL, NULL, APR_HOOK_MIDDLE );
}
EXTERN_C_BLOCK_BEGIN
module AP_MODULE_DECLARE_DATA pixmongo_module =
{
STANDARD20_MODULE_STUFF,
NULL,
NULL,
NULL,
NULL,
NULL,
pixmongo_hooks
};
EXTERN_C_BLOCK_END
I realized my mistake. Utility apxs is not capable to build C++ modules but only C (the latter worked fine for me). In the above mentioned codeproject article the apxs utility is only used to deploy already compiled module but not to compile it.
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