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Item5638: readdir/closedir attempted on invalid dirhandle on perl-5.10

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AppliesTo: Component: Priority: CurrentState: WaitingFor: TargetRelease ReleasedIn
Engine   Urgent Closed   patch 4.2.1, 5.0.0

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Current State:
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Target Release:
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Did anybody recently updated a machine running twiki to perl-5.10 and seeing "attempted on invalid dirhandle"? That's a perl error, not a twiki one. According to the docs opendir should return true on success but perl-5.10 doesn't. Test:
perl -e 'opendir DIR, foo && print "opening directory foo should fail\n";'

If perl-5.10 isn't going to be fixed soon, the workaround for TWiki is to add a check like

if (-d $dir)
in the store impls before opendir-ing the directory.

Btw TWiki::Store::RcsFile::getAttachmentList should return () instead of '' on an error. e.g. if opendir fails. That one is a real twiki error.

Can anybody confirm this finding?

-- TWiki:Main/MichaelDaum - 19 May 2008

Which distro runs perl 5.10 today? I ask so I can maybe make a virtual machine to confirm this or similar bugs.

And Michael are you fixing part 2 of this bug item?

-- TWiki:Main.KennethLavrsen - 29 May 2008


-d $dir
isn't helping in the unit tests that show this problem in 5.10. frown

on a pedant level: if you add -w to the top example, it tells you thatnot the code you meant to write smile

t42p:/mnt/data/sven/Desktop/un/firefox# perl -we 'opendir DIR, foo && print "opening directory foo should fail\n";'
Unquoted string "foo" may clash with future reserved word at -e line 1.
Bareword found in conditional at -e line 1.
Name "main::DIR" used only once: possible typo at -e line 1.
opening directory foo should fail

t42p:/mnt/data/sven/Desktop/un/firefox# perl -we 'opendir (DIR, "foo") && print "opening directory foo should fail\n";'
Name "main::DIR" used only once: possible typo at -e line 1.

The strange thing is, that AccessControlTests::test_SetInText with 5.10 has such a failure in the closedir() in Store::_rmtree, on a directoory that passes the=-d= test - something else is stuffed.

-- TWiki:Main.SvenDowideit - 01 Jun 2008

Who is following up on this one?

-- TWiki:Main.KennethLavrsen - 18 Jun 2008

looks like the right fix is the one suggested by perlcritic - http://perlcritic.tigris.org/Perl/Critic/Policy/InputOutput/ProhibitBarewordFileHandles.html

rearranged TWiki::Store::RcsFile::getAttachmentList to automatically return the right stuff.

-- TWiki:Main.SvenDowideit - 26 Jun 2008

Summary readdir/closedir attempted on invalid dirhandle on perl-5.10
ReportedBy TWiki:Main.MichaelDaum

SVN Range TWiki-5.0.0, Sun, 04 May 2008, build 16770
AppliesTo Engine

Priority Urgent
CurrentState Closed

Checkins TWikirev:16945 TWikirev:16946 TWikirev:16947 TWikirev:16948
TargetRelease patch
ReleasedIn 4.2.1, 5.0.0
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Topic revision: r10 - 2008-08-04 - KennethLavrsen
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