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Bug #18775 Conflict with variables between father and child
Submitted: 2002-08-07 05:40 UTC Modified: 2002-08-24 00:00 UTC
From: bariou at brasnah dot com Assigned:
Status: Not a bug Package: POSIX related
PHP Version: 4.2.2 OS: Linux
Private report: No CVE-ID: None
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From: bariou at brasnah dot com
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 [2002-08-07 05:40 UTC] bariou at brasnah dot com
I work with the pcntl extension and sockets, and I'm working on the developpement of a multiuser server. Several clients can connect limited to FD_SIZE. I start by a setup : 

//Setup of the sockets
//Setup of the client array

 Here the parent cheks connection
 It accepts and puts the new socket ressource in the first free slot of the array client 
      Child here.....
      Manage the dialog  its OK ! with several connection
      but when I shutdown a connection, exit is correct 
      ... I need to remove the linked ressources from
      $client[$slot] and it is the same for the select 
      So I do $client[$slot]=null;
      .... But It seems to fail, and each time the parent
      continues   to see the allocate ressources, so it
      refuses more connexion, because $client[$slot] is 
      not change from the parent point of view.
     }//En child
Where I'm wrong, is there a bug for variables between parent and child ? Or maybe I make a confusion for the way 
to remove ressources from my client array (value or references) ?

So, now I'm lost, Could somebody gives me some help about please ? I can send all the code if necessary !

Thanks for your help



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 [2002-08-24 00:00 UTC]
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at and the instructions on how to report
a bug at

Processes do not share memory, they are completly independant of each other. After the fork, a parent can not modify a childs memory area, and a child can not modify a parent's memory area. You either rethink your design, use shared memory, or use sockets for interprocess communication

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