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From Stefan Cars <ste...@snowfall.se>
Subject Re: Problems using IPC::Open3 & IPC::Run3
Date Wed, 09 Jul 2003 11:52:48 GMT
Thanks!

It seems to be working perfectly fine so I'll just go with it!

On Mon, 7 Jul 2003, Donovan Allen wrote:

> I have never had problems after doing the untie.
>
> My premise as to why this seems to be an ok thing to do is:
> * If you modify the work around code to some sort of debug output everytime
> $tie_stdin is defined, you will see that STDIN gets tied by mod_perl every
> request.
> * Also, my assumption is that the tied STDIN has already served its purpose for
> the request by the time we get to the embperl scripts.  This could be incorrect,
> but I have not had anything break because of it.
>
> I am lazy, so as long as something isn't broken and seems to be working as
> intended, I generally stop fiddling with it unless I am looking for trouble.
>
> It might be possible to create a protected copy of STDIN, but I did a quick
> duplicate protection test and it seems that the duplicated handle is not tied, so
> something is amiss and protecting tied filehandles may not be possible...then
> laziness kicked in. :-)
>
> Ultimately, the mod_perl maintainers may be a better source for more details and
> explanations, since they broke STDIN in the first place.
>
> Then again, if you ask me, the mod_perl maintainers should also do more or less
> one of the following:
>   a> create their own duped STDIN to tie and mangle
>   b> fix the tie code to handle all the common downstream STDIN uses
>   c> or untie it if they are done with it so we don't have to guess, worry, and/or
> dig around for answers to potentially harmless concerns.
>
> Cheers,
> Donovan Allen
>
> Stefan Cars wrote:
>
> > Okey but shouldn't i tie it back some how ?
> >
> > /S
> >
> > On Sat, 5 Jul 2003, Donovan Allen wrote:
> >
> > > Found this somewhere back when this bug first appeared in mod_perl:
> > >
> > > # work-around for mod_perl
> > > my $tie_stdin = tied *STDIN;
> > > untie *STDIN if $tie_stdin;
> > >
> > > # insert open2() or open3() statement after the above
> > >
> > > Gerald,
> > >
> > > It is a mod_perl bug, but I would consider putting it in the FAQ.  Would
> > > probably be very helpful to people.
> > >
> > > Gerald Richter wrote:
> > >
> > >  Is there anyway to use IPC::Open3 or anything like it or is there another
> > > module doing the same thing which can be used with embperl ?
> > >
> > >
> > >
> > >  Sorry, I don't know a solution. Maybe you can find something in the modperl
> > > guide (perl.apache.org) or go ask on the modperl mailing list
> > >
> > > Gerald
> > >
> > >
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> > >
> > >
> > >
> > >
> > >
> > >
>
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