I was having some issues with processing a signal using an object method I use for something else as well. In particular, I wanted to handle SIGCHLD with my own method "do_reap()" which I also call after a stream_select timeout and that uses a non-blocking pcntl_waitpid function.
The method was called when the signal was received but it couldn't reap the child.
The only way it worked was by creating a new handler that itself called do_reap().
So in other words, the following does not work:
<?php
class Parent {
private function do_reap(){
$p = pcntl_waitpid(-1,$status,WNOHANG);
if($p > 0){
echo "\nReaped zombie child " . $p;
}
public function run(){
pcntl_signal(SIGCHLD,array(&$this,"do_reap"));
$readable = @stream_select($read,$null,$null,5); if($readable === 0){
$this->do_reap();
}
}
?>
But this work:
<?php
class Parent {
private function do_reap(){
$p = pcntl_waitpid(-1,$status,WNOHANG);
if($p > 0){
echo "\nReaped zombie child " . $p;
}
public function run(){
pcntl_signal(SIGCHLD,array(&$this,"child_died"));
$readable = @stream_select($read,$null,$null,5); if($readable === 0){
$this->do_reap();
}
private function child_died(){
$this->do_reap();
}
}
?>
