Scott Hill wrote:
On 7/23/07, *Orson Jones* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Looking around php.net <http://php.net> I found this
http://us2.php.net/manual/en/function.pcntl-fork.php
You can do a standard fork() using php. Check it out.
Orson
If you don't care about the child process after it is finished, you
must do a pcntl_signal(SIGCHLD,SIG_IGN); before the fork. This will
make the parent process ignore any signal sent back by a dying child.
When the child process sees that it's kill signal was either processed
or ignored, it dies quietly. This prevents what is known as zombie or
orphan processes in *nix, which is a dead child process that has been
shunned by its parent. If you want to track the process of the child
process, leave out the pcntl_signal and use pcntl_waitpid after the
fork. This is a very, very common occurance in the *nix world. For
example, the apache server forks a child process for every request on
its socket(s). And I don't care what anyone says (about XP or Vista),
Windows still sucks when it comes to forking any kind of process.
My humble $.02.
I think I've got pcntl_fork() working (see below). The tricky part is
that pcntl_* functions can only be called in cgi mode (i.e. from the
command line). One thing that is puzzling is that $argv[0] equals
'fork.php' in sleep.php.
I haven't yet tested to see if this works on Windows. You mention
Windows--are you saying that this would probably fail on Windows 2003
Server? (My target platforms are Win 2003 Server and CentOS Linux)
With this setup, it looks like I might be able to make a Fork class so
that I can fork any file with something like Fork::spawn($filename);.
It would require exec() access, but that is required for this particular
environment anyway.
-- Ken
fork.php:
<?php
$path = '/home/ksnyder/www/test/sleep.php';
exec("php $path");
echo "<p>Called script $path and didn't wait for return value</p>";
?>
sleep.php:
<?php
$logfile = '/home/ksnyder/www/test/sleep.log';
if (!function_exists('pcntl_fork')) {
die('Error: function pcntl_fork does not exist');
}
pcntl_signal(SIGCHLD, SIG_IGN);
$pid = pcntl_fork();
if ($pid == -1) {
// Something went wrong (handle errors here)
file_put_contents($logfile, "Error, unable to fork!");
} elseif ($pid == 0) {
// This part is only executed in the child
sleep(10);
file_put_contents($logfile, date('Y-m-d H:i:s') . ' '
.print_r($argv,true));
} else {
// This part is only executed in the parent
exit(0);
}
?>
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