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Posted by Thomas on 11/19/06 11:14
Hi Peter,
I ended up with this solution:
function sig_handler($signo) {
switch($signo){
case SIGCHLD:
$child = pcntl_wait($status,WNOHANG);
if($child > 0){
// Do something
}
}
}
pcntl_signal(SIGCHLD, "sig_handler");
It seems to work like a charm, but it looks a bit different from your
solutions. You sound like you know A LOT more about this than I do, so
perhaps I could trouble you for a short explanation on the differences
between the three solutions? :o)
From my chair you second solution looks like the most "correct" way to
go. Am I right?
Sincerely,
Thomas
petersprc wrote:
> Hi,
>
> The OS keeps the zombie around in case the parent process eventually
> decides to retrieve the child's exit status information. You can tell
> the OS you're not interested and to not keep zombies around using this:
>
> pcntl_signal(SIGCHLD, SIG_IGN);
>
> You could also trap SIGCHLD and check the child's exit status:
>
> function sigchld($signo) {
> while (($pid = pcntl_waitpid(-1, $status, WNOHANG)) > 0) {
> echo "Child with PID $pid returned " .
> pcntl_wexitstatus($status) . ".\n";
> }
> }
>
> pcntl_signal(SIGCHLD, 'sigchld');
>
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