ngx_conf_handler

[nn hust]

Yes，it help me understand the code more clearly

在 2010年12月31日 下午7:18，eagle sbc <sbc19861004 at gmail.com>写道：

> hi, nn hust:
>    First, the 'cf->ctx' is a context variable. When in the DIRECT_CONF or
> MAIN_CONF context, it point to 'void*[MAX_MODULE]'  array, while in the HTTP
> context, it point to a 'ngx_http_conf_ctx_t', which is a structure with
> there pointers each point to a 'void *[MAX_HTTP_MODULE]' array. Other CORE
> module act the same as HTTP.
>    I draw a diagram to make seems more clear :
> [image: cf.jpg]
>
> Every module structure has a 'index' member and 'ctx_index' member. 'index'
>  indicate its own data position in the glocal 'void *' array, while
> 'ctx_index' indicate the context related. (According to what I understand,
> The module type already choose which kind of array it will use, so the two
> index is not necessary)
>
> The different between DIRECT and MAIN is:  DIRECT means the memory is
> already allocated, and the cmd's set function can directly use it, so pass
> the pointer to the allocated memory; MAIN means the memory to be allocated
> depend on the module, so pass the pointer to the pointer in the array.
>
> cmd's 'conf' member indicate which context it will store its data. As in
> HTTP, we can choose MAIN, SRV, LOC.
>
> And I think the code is now easy to understand.
> On Fri, Dec 31, 2010 at 4:46 PM, nn hust <nzjemail at gmail.com> wrote:
>
>> I am confused by the multi dimensions pointer of the module configure
>> structure
>>
>> if (cmd->type & NGX_DIRECT_CONF) {
>>                 conf = ((void **) cf->ctx)[ngx_modules[i]->index];
>>
>>             } else if (cmd->type & NGX_MAIN_CONF) {
>>                 conf = &(((void **) cf->ctx)[ngx_modules[i]->index]);
>>
>>             } else if (cf->ctx) {
>>                 confp = *(void **) ((char *) cf->ctx + cmd->conf);
>>
>>                 if (confp) {
>>                     conf = confp[ngx_modules[i]->ctx_index];
>>                 }
>>             }
>>
>>             rv = cmd->set(cf, cmd, conf);
>>
>>
>>
>>
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>>
>>
>
>
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