Hi,
Greetings to All..I am a new member of this list and would like to know the
following :-
1. Suppose i make a demo module named "mod_demo" that would print "Hello
World" once Apache web server is started. I have surfed through different web
sites and jotted down the following steps:
a) Write the corresponding C file mod_demo.c that prints "Hello World"
b) Compile the module by invoking
gcc -fPIC -DSHARED_MODULE -I/usr/include/httpd
-I/usr/include/apr-0 -c mod_demo.c
c) Make a shared object from the object file
ld -Bshareable -o mod_demo.so mod_demo.o
d) Copy the file to the apache modules directory:
cp mod_demo.so /usr/lib/httpd/modules/
chmod 0755 /usr/lib/httpd/modules/mod_demo.so
e) Add the line to httpd.conf file for Apache to load the module
LoadModule myvar_module /usr/lib/httpd/modules/mod_demo.so
f) Add the following in the httpd.conf file
<IfModule mod_demo.c>
DemoEnable On
</IfModule>
This will enable the new module.
Now my doubts are:
a) To enable the module should not I stop the apache server(service httpd
stop) and compile the apache directory again? If yes How do i compile the
apache directory again?
b) I did not understand the format of how to write the mod_demo.c. It is
not simple C file. Here is what i found in net as contents of some
mod_myvar.c. In the Fedora core Linux distribution the following header files
are not present by default.
-----------------------------------------------------------------------------
---------------
#include "httpd.h"
#include "http_config.h"
#include "http_protocol.h"
#include "http_log.h"
#include "ap_config.h"
module AP_MODULE_DECLARE_DATA myvar_module;
static apr_status_t myvar_cleanup(void *cfgdata) {
// cleanup code here, if needed
return APR_SUCCESS;
}
static void myvar_child_init(apr_pool_t *p, server_rec *s) {
apr_pool_cleanup_register(p, NULL, myvar_cleanup, myvar_cleanup);
}
static int myvar_post_read_request(request_rec *r) {
char myvar[16] = "CAPTAIN WAS HERE";
apr_table_set(r->notes, "myvar", myvar); // PHP: apache_notes
apr_table_set( r->subprocess_env, "myvar", myvar ); // PHP:
HTTP_SERVER_VARS
return OK;
}
static const char *set_myvar_enable(cmd_parms *cmd, void *dummy, int arg) {
ap_get_module_config(cmd->server->module_config, &myvar_module);
return NULL;
}
static const command_rec myvar_cmds[] = {
AP_INIT_FLAG( "MyVarEnable", set_myvar_enable, NULL, OR_FILEINFO, "Turn on
mod_myvar"),
{NULL}
};
static void myvar_register_hooks(apr_pool_t *p) {
ap_hook_post_read_request( myvar_post_read_request, NULL, NULL,
APR_HOOK_MIDDLE );
ap_hook_child_init( myvar_child_init, NULL, NULL,
APR_HOOK_MIDDLE );
}
// API hooks
module AP_MODULE_DECLARE_DATA myvar_module = {
STANDARD20_MODULE_STUFF,
NULL, /* create per-dir config structures */
NULL, /* merge per-dir config structures */
NULL, /* create per-server config structures */
NULL, /* merge per-server config structures */
myvar_cmds, /* table of config file commands */
myvar_register_hooks /* register hooks */
};
-----------------------------------------------------------------------------
------------------------
Thanks,
Souramita
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