ok...
php -r 'exec("perl /home/test/college.pl >/dev/null &");' seems to do the
trick... in that it returns, while running the perl process in the
background...
i assume that this process will work from a web app, regardless of the user
function, or even the behavior of the web server, although that may have
something to do with what process/priv is running the app....
thanks,
-bruce
-----Original Message-----
From: Justin Patrin [mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 21, 2004 12:21 PM
To: Michael Sims
Cc: [EMAIL PROTECTED]
Subject: Re: [PHP] exec/system question..
On Wed, 21 Jul 2004 13:55:37 -0500, Michael Sims
<[EMAIL PROTECTED]> wrote:
> Michael Sims wrote:
> > Justin Patrin wrote:
> >> On Wed, 21 Jul 2004 10:09:52 -0700, bruce <[EMAIL PROTECTED]>
> >> wrote:
> >>> 2) i could run the perl script, and have it somehow run in the
> >>> background.... this would ba good, if there's a way to essentially
> > [...]
> >> AFAIK there's no way to do this. When the request ends (user hits
> >> stop, exit or die called) the process is ended. This includes
> >> children.
> >
> > There are ways around that, though, at least if you're running unix:
> >
> > exec('bash -c "exec nohup setsid your_command > /dev/null 2>&1 &"');
>
> Sorry to followup to my own post, but I just did some quick testing and
apparently
> none of the above (nohup, setsid) is really necessary. As long as the
output of the
> command is redirected somewhere and the "&" is used to start it in the
background it
> will continue to run even if the process that launched it exits or is
killed. I
> tested this with the following (named 'test.php'):
>
> ---
> #!/usr/local/bin/php
> <?
>
> if (isset($argv[1])) {
> exec('./test.php > /dev/null &');
> }
>
> sleep(10);
>
> exec('wall testing - ignore '.getmypid());
> ?>
> ---
>
> I opened two SSH sessions, ran the above script in one (using './test.php
1') then
> immediately exited the SSH session. The PHP processes (both of them)
continued to
> execute and I saw the "wall" output from both scripts in my other SSH
session. So
> apparently the nohup setsid stuff is overkill...
>
Did you try it from the web? Just to be devil's advocate and be sure
that, say, clicking Stop doesn't stop the background process. Also,
does *killing* the original script kill the child?
--
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