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From "ericwu" <>
Subject [users@httpd] How to make sure the my module run before the php module?
Date Fri, 18 Jan 2013 01:29:32 GMT
Hi, everyone


I want ask an apache module question , hope somebody can help me, please.


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 after the php module in http.conf, like

LoadModule php5_module /usr/lib/apache2/modules/

LoadModule first_filter_module /usr/lib/apache2/modules/
AddInputFilter PidFilter .php


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,

    ap_register_input_filter(pidFilterName, pid_filter, NULL,



/* 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                      */



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