I tried redirecting stderr to /dev/null and it did not help:
system("date >> $f 2> /dev/null");
I am using the worker processing model. Does it work for you (or anyone
else) without causing periodic child process segmentation faults?
On Tue, 2012-01-03 at 16:29 -0500, Daniel Risacher wrote:
> It's been a while since I looked at doing this, but IIRC it's fairly
> dependent on the processing model that Apache is using. Are you
> mpm_prefork, or mpm_worker?
>
> Also, I found it was important to redirect stderr to /dev/null:
>
> sub play {
> system "/usr/bin/xmms -t 2> /dev/null";
> }
>
>
> On Tue, Jan 3, 2012 at 12:48 PM, David Booth <da...@dbooth.org> wrote:
> > I am trying to run a shell command from a mod_perl2 response handler.
> > It works properly for some number of HTTP requests, but sometimes it
> > fails (somewhat randomly) and I see in my Apache2 error log that one of
> > the Apache2 child processes has died with a segmentation fault.
> > For example, /var/log/apache2/error.log shows:
> >
> > [Tue Jan 03 12:16:10 2012] [notice] child pid 3538 exit signal Segmentation
> > fault (11)
> >
> > Is this normal? How does one normally run a shell command from a
> > response handler? I do not want to return the command's output to the
> > client.
> >
> > Here is a trivial example response handler that exhibits this behavior:
> >
> > sub handler
> > {
> > my $r = shift || die;
> > my $f = $ENV{DOCUMENT_ROOT} . "/date.txt";
> > system("date >> $f");
> > $r->internal_redirect("/date.txt");
> > return Apache2::Const::OK;
> > }
> >
> > Can anyone provide any guidance? Does this work for you?
> >
> > Note that you may not notice the problem if you don't carefully watch
> > the Apache2 error log (e.g., with "tail -f /var/log/apache2/error.log"),
> > because Apache2 automatically spawns new children processes as needed,
> > and client (such as Firefox or wget, though not curl) seem to
> > automatically re-try the request when it fails, thus giving the illusion
> > of succeeding.
> >
> > P.S. I have posted about this on perlmonks, but thus far have not found
> > a solution:
> > http://www.perlmonks.org/?node_id=945947
> >
> >
> > --
> > David Booth, Ph.D.
> > http://dbooth.org/
> >
> > Opinions expressed herein are those of the author and do not necessarily
> > reflect those of his employer.
> >
>
>
--
David Booth, Ph.D.
http://dbooth.org/
Opinions expressed herein are those of the author and do not necessarily
reflect those of his employer.
