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How to run apache module before the php module?

3:52 am on Jan 14, 2013 (gmt 0)

New User

joined:Jan 14, 2013
posts: 2
votes: 0

Hi, everyone

I want ask an apache module question , hope you can help me, thanks.

I write the apache input filter module,
I want it log apache process pid and run before the php module,
but it always run after php,

I load apache module before the php module in http.conf, like

LoadModule first_filter_module /usr/lib/apache2/modules/mod_first_filter.so
AddInputFilter PidFilter .php
LoadModule php5_module /usr/lib/apache2/modules/libphp5.so

I try modify ap_hook_insert_filter function nOrder variable to APR_HOOK_FIRST, but it not work,
then I try modify ap_register_input_filter ftype variable to AP_FTYPE_RESOURCE, but it not work.

So, I try modify ap_hook_insert_filter function aszPre variable to "mod_php5.c", "mod_php.c", "libphp5.c",
because I don't make sure the php module real name, but it still not work...

How I need do something to make sure this module run before the php?

Please help me solve this problem, thanks all.


this is my source code

#include "httpd.h"
#include "http_config.h"
#include "http_request.h"
#include "http_protocol.h"
#include "ap_config.h"

#include "apr_general.h"
#include "apr_buckets.h"
#include "apr_lib.h"

#include "util_filter.h"

#include <time.h>

static const char pidFilterName[]="PidFilter";
module AP_MODULE_DECLARE_DATA pid_filter_module;

typedef struct
int bEnabled;
} PidFilterConfig;

static char* print_pid(char *filename, char *execute){
FILE *fp;
fp = fopen(filename,"a");
fprintf(fp,"%s pid: %d ,fpid: %d, time: %d\n", execute, (int)getpid(), (int)getppid(), time(NULL) );
return sql;

static apr_status_t pid_filter(ap_filter_t *f, apr_bucket_brigade *bb, ap_input_mode_t mode,
apr_read_type_e block, apr_off_t readbytes){
char *filename="/var/www/sql.log";
char *execute="apache pid filter: ";
print_pid(filename, execute);

int rv;
rv = ap_get_brigade(f->next, bb, mode, block, readbytes);
return rv;

static void *PidFilterInCreateServerConfig(apr_pool_t *p, server_rec *s)
PidFilterConfig *pConfig = apr_pcalloc(p, sizeof *pConfig);

pConfig->bEnabled = 0;

return pConfig;

static const char *PidFilterInEnable(cmd_parms *cmd, void *dummy, int arg)
PidFilterConfig *pConfig
= ap_get_module_config(cmd->server->module_config,

return NULL;

static const command_rec PidFilterInCmds[] =
AP_INIT_FLAG(pidFilterName, PidFilterInEnable, NULL, RSRC_CONF,
"Run an input pid filter on this host"),
{ NULL }

static void PidFilterInsertFilter(request_rec *r)
PidFilterConfig *pConfig=ap_get_module_config(r->server->module_config,

if (!pConfig->bEnabled)
static const char * const aszPre[] = { "mod_php5.c", "mod_php.c", "libphp5.c", NULL };
ap_add_input_filter(pidFilterName, aszPre, r, r->connection);

static void pid_filter_register_hooks(apr_pool_t *p)
static const char * const aszPre[] = { "mod_php5.c", "mod_php.c", "libphp5.c", NULL };
ap_hook_insert_filter(PidFilterInsertFilter, aszPre, NULL, APR_HOOK_FIRST - 1);
ap_register_input_filter(pidFilterName, pid_filter, NULL, AP_FTYPE_RESOURCE);

/* Dispatch list for API hooks */
module AP_MODULE_DECLARE_DATA pid_filter_module = {
NULL, /* create per-dir config structures */
NULL, /* merge per-dir config structures */
PidFilterInCreateServerConfig, /* create per-server config structures */
NULL, /* merge per-server config structures */
PidFilterInCmds, /* table of config file commands */
pid_filter_register_hooks /* register hooks */
12:48 pm on Jan 14, 2013 (gmt 0)

Senior Member from US 

WebmasterWorld Senior Member lucy24 is a WebmasterWorld Top Contributor of All Time 5+ Year Member Top Contributors Of The Month

joined:Apr 9, 2011
votes: 403

It's much too late in the night for questions like this, but... don't Apache modules execute in the inverse order of loading? If I read your opening paragraph right, you're loading A before B when you should be loading B before A.
2:52 am on Jan 15, 2013 (gmt 0)

New User

joined:Jan 14, 2013
posts: 2
votes: 0

hi lucy24

thanks for your reply,
I change load module order to

LoadModule php5_module /usr/lib/apache2/modules/libphp5.so
LoadModule first_filter_module /usr/lib/apache2/modules/mod_first_filter.so
AddInputFilter PidFilter .php

and restart the apache,
but...still not work... orz

Actually, it's not too late, because I post this thread in the afternoon at taiwan. LOL