Apache module development/C Language extension Apache (3: A very simple Apache module)

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Author: User
Apache module development/C Language extension Apache (3: A very simple Apache module)
This article from: http://www.loveopensource.com /? P = 18 Original article: Apache module development/C Language extension Apache (3: A very simple Apache module)
By linux_prog
With the basics of the above articles, you should try to write some simple modules,
The following is a simple Apache module. Let's take a look at it.
$ CD/usr/local/apache2.2.4
$ VI mod_c.c

#include <time.h>
#include <stdlib.h>
#include "apr.h"
#include "apr_lib.h"
#include "apr_strings.h"

#include "apr_want.h"

#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_request.h"

module AP_MODULE_DECLARE_DATA c_module;

static int c_handler(request_rec *r)
 ap_rprintf(r,"query string:%s/n",r->args);
 return OK;
static void register_hooks(apr_pool_t *p)
 ap_hook_handler(c_handler, NULL, NULL, APR_HOOK_MIDDLE);

/* module structure */
module AP_MODULE_DECLARE_DATA c_module = {
    NULL, /* dir config creater */
    NULL, /* dir merger — default is to override */
    NULL, /* server config */
    NULL, /* merge server configs */
    NULL, /* command apr_table_t */
    register_hooks /* register hooks */

Compile and install this module (apxs provided by Apache is very good ):
$./Bin/apxs-a-I-n C mod_c.la
At this time, apxs will automatically help us install the compiled mod_c.so to the modules/directory, and the module has been loaded in httpd. conf:
[Root @ cn-weblog apache2.2.4] # grep mod_c CONF/httpd. conf
Loadmodule c_module modules/mod_c.so

Test this module:
$./Bin/apachectl stop
$./Bin/apachectl start

Access http: // myhostname/index.html query = YY in IE
Handler: text/html
Query string: query = YY
The module runs successfully.

Briefly explain the preceding module.

All Apache modules must be the struct, which defines the content.
/* Module structure */
Module ap_module_declare_data c_module = {
Null,/* dir config creater */
Null,/* dir merger-default is to override */
Null,/* server config */
Null,/* merge server configs */
// The above four items define the role of commands in httpd. conf.
Null,/* command apr_table_t * // defines the commands added in httpd. conf and the processing functions of each command
Register_hooks/* Register hooks * // hooks, which defines when to execute the related functions of our module.

Ap_hook_handler (c_handler, null, null, apr_hook_middle );
It indicates that our function-c_handler is called when processing the content request.

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