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Testing for a directory handle bug #16391

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p5pRT opened this issue Jan 29, 2018 · 5 comments
Open

Testing for a directory handle bug #16391

p5pRT opened this issue Jan 29, 2018 · 5 comments

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@p5pRT
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@p5pRT p5pRT commented Jan 29, 2018

Migrated from rt.perl.org#132779 (status was 'open')

Searchable as RT132779$

@p5pRT
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@p5pRT p5pRT commented Jan 29, 2018

From zebra__crossing86@hotmail.com

Good Day Perl bug testers

In the course of trying to solve some programming issues, I and the perl monks may have uncovered a bug

See below perl monks forum entry

https://www.perlmonks.org/?node_id=1208018

Matt

@p5pRT
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@p5pRT p5pRT commented Jan 29, 2018

From @jkeenan

On Mon, 29 Jan 2018 05​:26​:49 GMT, zebra__crossing86@​hotmail.com wrote​:

Good Day Perl bug testers

In the course of trying to solve some programming issues, I and the
perl monks may have uncovered a bug

See below perl monks forum entry

https://www.perlmonks.org/?node_id=1208018

Since there's a fair amount of back-and-forth discussion in that thread, it's not easy to see what the bug is precisely.

Could you please post in *this* ticket a concise description of the problem?

Thank you very much.
--
James E Keenan (jkeenan@​cpan.org)

@p5pRT
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@p5pRT p5pRT commented Jan 29, 2018

The RT System itself - Status changed from 'new' to 'open'

@p5pRT
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@p5pRT p5pRT commented Jan 29, 2018

From @sisyphus

-----Original Message-----
From​: James E Keenan via RT
Sent​: Tuesday, January 30, 2018 2​:56 AM
To​: OtherRecipients of perl Ticket #132779​:
Cc​: perl5-porters@​perl.org
Subject​: [perl #132779] Testing for a directory handle bug

See below perl monks forum entry

https://www.perlmonks.org/?node_id=1208018

Could you please post in *this* ticket a concise description of the
problem?

I'm not the OP but the problem is that, on MS Windows, '-X DIRHANDLE'
produces a fatal error 'The dirfd function is unimplemented'.
(At least, this happens when '-X' is either '-f' or '-d'.)
This has been the case beginning with perl-5.8.9. On 5.8.8 (and earlier ?)
'-d DIRHANDLE' and '-f DIRHANDLE' would simply always silently return false.

On perl-5.27.8​:

####################
C​:\_32>perl -le "opendir $d, 'comp' or die $!; print 'ok';"
ok

C​:\_32>perl -le "opendir $d, 'comp' or die $!; print 'dir' if -d $d;"
The dirfd function is unimplemented at -e line 1.

C​:\_32>perl -le "opendir D, 'comp' or die $!; print 'dir' if -d D;"
The dirfd function is unimplemented at -e line 1.

C​:\_32>perl -le "opendir D, 'comp' or die $!; print 'dir' if -d \*D;"
The dirfd function is unimplemented at -e line 1.
####################

And no mention of any such behaviour (afaics) in either the -X documentation
or the perlport documentation.

Is there really no way to implement '-X DIRHANDLE' on Windows ?

Cheers,
Rob

@p5pRT
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@p5pRT p5pRT commented Jan 30, 2018

From @cpansprout

On Mon, 29 Jan 2018 15​:51​:21 -0800, sisyphus wrote​:

Is there really no way to implement '-X DIRHANDLE' on Windows ?

For -f and -d, considering that perl *knows* whether it is a directory handle, it probably is possible. It shouldn’t even require a system call.

But, then, I really haven’t thought through the consequences, and I am not a Windows user.

--

Father Chrysostomos

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