Use of callback on a stream

[Olivier Dupuis <dupuis.olivier@xxxxxxxxxx>]

Hello,

I am trying to make a daemon that launches shell commands via proc_open 
and gets the stdout of the command via a pipe. The thing is that I would 
like to get this stdout via a callback, instead of monitoring the pipe 
regularly.
I tried the following code (this is a simplified version of it), but the 
callback never gets called,

does anyone know what I forgot ?
Thanks,
Olivier


<?php
// Php5 used

// we build the descriptor array
$descriptorspec = array(
             0 => array("pipe", "r"),  // stdin
             1 => array("pipe", "w"),  // stdout
             2 => array("pipe", "w")   // stderr
             );
$pipes=array();

// We make a simple callback function with an ugly global var
function stream_callback(){
 global $pipes;

 $stdout_child=stream_get_contents($pipes[1]);
 print("Callback received:\n");
 print($stdout_child."\n");
}

$context=stream_context_create(array());
stream_context_set_params($context,array('notification' => 'stream_callback'));
$handle=proc_open("/bin/ls /tmp",$descriptorspec,$pipes,null,null,array('context' => $context));
stream_context_set_params($pipes[1],array('notification' => 'stream_callback'));

while (true){
 print("Waiting...\n");
 sleep(5);
}





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