Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:57823
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain zend.com designates 212.199.177.89 as permitted sender)
To: Stas Malyshev <smalyshev@sugarcrm.com>
Date: Mon, 13 Feb 2012 11:38:00 +0200
User-Agent: KMail/1.13.7 (Linux/2.6.37; KDE/4.7.2; i686; ; )
CC: Dmitry Stogov <dmitry@zend.com>, PHP Internals <internals@lists.php.net>,
	Alex Haiut <alex.h@zend.com>, Zeev Suraski <zeev@zend.com>, Eran Ifrah
	<eran@zend.com>, Lior Kaplan <lior.k@zend.com>
References: <201202121409.54891.yoram.b@zend.com> <4F38D3B8.6010304@zend.com> <4F38D4F9.2090808@sugarcrm.com>
In-Reply-To: <4F38D4F9.2090808@sugarcrm.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Message-ID: <201202131138.00917.yoram.b@zend.com>
Subject: Re: [PHP-DEV] Re: restore user opcode handler in PHP
From: yoram.b@zend.com (yoram bar haim)

Here is a simple test program that reproduce the issue on mac:

lib.h:                                                                                                         
#include "lib.h"                                                                                         
void set_index(int index, int value);                                                                    
int get_index(int index);

lib.c:
#include "lib.h"                                                                                                                                                                                                   
                                                                                                                                                                                                                   
static int glob_var[] = {0,0,0,0};                                                                                                                                                                                 
                                                                                                                                                                                                                   
void set_index(int index, int value) {                                                                                                                                                                             
    glob_var[index] = value;                                                                                                                                                                                       
}                                                                                                                                                                                                                  
                                                                                                                                                                                                                   
int get_index(int index) {                                                                                                                                                                                         
    return glob_var[index];                                                                                                                                                                                        
}

main.c:
#include <stdio.h>                                                                                                                                                                                                 
#include <dlfcn.h>                                                                                                                                                                                                 
#include "lib.h"                                                                                                                                                                                                   
                                                                                                                                                                                                                   
int main() {                                                                                                                                                                                                       
    void *handle = dlopen ("lib.so",0);                                                                                                                                                                            
    set_index(0,1);                                                                                                                                                                                                
    dlclose(handle);                                                                                                                                                                                               
    handle = dlopen ("lib.so",0);                                                                                                                                                                                  
    printf("%d\n",get_index(0));                                                                                                                                                                                   
    return 0;                                                                                                                                                                                                      
}

shell> gcc -o lib.so -shared lib.c
shell> gcc -o main main.c lib.so
shell> ./main

On Monday, February 13, 2012 11:16:41 AM Stas Malyshev wrote:
> Hi!
> 
> > I'm not familiar with Mac, but I saw such behavior on Linux very long
> > time ago, when on PHP restart static variables were still keep values
> > from old process.
> 
> That might happen if the shared library was not unloaded (dlopen will
> not re-load library that is already loaded) however I don't understand
> how it can happen on Apache - it's supposed to dlclose all modules. Is
> it reproducible on any Apache version on Linux or Mac?