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Re^4: Function to sweep a file tree

by bojinlund (Prior)
on Jun 22, 2020 at 05:56 UTC ( #11118342=note: print w/replies, xml ) Need Help??


in reply to Re^3: Function to sweep a file tree
in thread Function to sweep a file tree

About freezes:

I have made a script with
foreach my $done ( 1 .. 100 ) { FS_sweep( 'C:', \&FS_file_big ); ...

Running this script several times in Emacs, using the compile command, all resulted in a freeze. The the number of calls to FS_sweep before freeze was between 0 and 91.

Running the script in the command shell resulted in 0 to 14 succeeded calls to FS_sweep. In most cases none.

<C:/Users/bo/Application Data/> (was this a question/problem?)

use strict; use warnings; use 5.010; use Data::Dump qw(dump dd ddx); use Win32::LongPath; use Fcntl ':mode'; sub do_readdirL_arr { my $dir_path = shift; my $dir = Win32::LongPath->new; unless ( $dir->opendirL($dir_path) ) { warn "!! unable to open $dir_path ($^E)"; return; } my @name = $dir->readdirL(); return \@name; } sub do_readdirL_while { my $dir_path = shift; my $dir = Win32::LongPath->new; unless ( $dir->opendirL($dir_path) ) { warn "!! unable to open $dir_path ($^E)"; return; } my @name; while ( my $name = $dir->readdirL() ) { push @name, $name; } return \@name; } my @path = ( 'C:/Documents and Settings', 'C:/ProgramData/Application +Data', 'C:/ProgramData/Desktop', 'C:/ProgramData/Start Menu', 'C:/ProgramData/Templates', #'C:/Users', 'C:/Windows/appcompat/Programs', 'C:/Windows/System32/Com/dmp +', #'C:/Windows/System32/spool', 'C:/Windows/System32/Tasks', 'C:/Windows/System32/Tasks_Migrated', 'C:/Windows/SysWOW64/Com/dmp +', 'C:/Windows/SysWOW64/Tasks', 'C:/Windows/Temp', ); foreach my $path (@path) { say "$path: array: ", dump( do_readdirL_arr($path) ), ' while: ', dump do_readdirL_while($path); } __DATA__ C:/Documents and Settings: array: ["g"] while: ["~"] C:/ProgramData/Application Data: array: ["u"] while: ["{"] C:/ProgramData/Desktop: array: ["H"] while: ["|"] C:/ProgramData/Start Menu: array: ["~"] while: ["m"] C:/ProgramData/Templates: array: ["K"] while: ["e"] C:/Windows/appcompat/Programs: array: ["u"] while: ["Q"] C:/Windows/System32/Com/dmp: array: ["m"] while: ["l"] C:/Windows/System32/Tasks: array: ["\\"] while: ["\x7F"] C:/Windows/System32/Tasks_Migrated: array: ["\22"] while: ["\f"] C:/Windows/SysWOW64/Com/dmp: array: ["p"] while: ["u"] C:/Windows/SysWOW64/Tasks: array: ["["] while: ["p"] C:/Windows/Temp: array: ["\x{105}"] while: ["\x{110}"]

__DATA__ contains an example of output. It changes for every run.

I have no access to the directories using the MS File explorer.

When I in FS_sweep skip those directories, 'C:/Users' and C:/Windows/System32/spool' there are no freezes.

Replies are listed 'Best First'.
Re^5: Function to sweep a file tree (UPDATED)
by vr (Curate) on Jun 22, 2020 at 11:03 UTC

    Now it's getting sad/worrisome/interesting. With my old 5.26 Perl, your script above reports empty arrays as expected (and, as a side note, some reasonable content if run with administrative rights). Also, I finally did mega-stress-test (sweep C:/ for 100 times), it completes OK.

    Then I tried latest recommended Strawberry Perl versions 5.30.2.1, 5.28.2.1, 5.26.3.1, -- under 5.28 and 5.30 results are as you report: random bytes/single characters for "protected operating system" (as MS UI calls them) folders. The "mega-test" (tried once) hung on 5th sweep, though I was able to ctrl-C it. So, definitely looks like a bug (somewhere in Win32::LongPath XS guts?).

    Update. Actually, the bug is not related to "special system" directories, and I'm no longer sure Win32::LongPath under 5.26 behaved correctly, too. Maybe the call to opendirL shouldn't succeed in the first place.

    >perl -v This is perl 5, version 30, subversion 2 (v5.30.2) built for MSWin32-x +64-multi-thread Copyright 1987-2020, Larry Wall Perl may be copied only under the terms of either the Artistic License + or the GNU General Public License, which may be found in the Perl 5 source ki +t. Complete documentation for Perl, including FAQ lists, should be found +on this system using "man perl" or "perldoc perl". If you have access to + the Internet, point your browser at http://www.perl.org/, the Perl Home Pa +ge. >mkdir abc >perl -MData::Dump -MWin32::LongPath -E "for (1..5) {my $lp=Win32::Lon +gPath->new; $lp->opendirL('abc') or die; dd [$lp->readdirL]}" [".", ".."] [".", ".."] [".", ".."] [".", ".."] [".", ".."] >icacls abc /deny Everyone:F processed file: abc Successfully processed 1 files; Failed processing 0 files >perl -MData::Dump -MWin32::LongPath -E "for (1..5) {my $lp=Win32::Lon +gPath->new; $lp->opendirL('abc') or die; dd [$lp->readdirL]}" ["\b"] ["\b"] ["\35"] ["\32"] ["'"] >perl -MData::Dump -MWin32::LongPath -E "for (1..5) {my $lp=Win32::Lon +gPath->new; $lp->opendirL('abc') or die; dd [$lp->readdirL]}" ["\3"] ["\26"] ["#"] ["\22"] [4] >perl -MData::Dump -MWin32::LongPath -E "for (1..5) {my $lp=Win32::Lon +gPath->new; $lp->opendirL('abc') or die; dd [$lp->readdirL]}" ["M"] ["~"] ["M"] ["w"] ["I"] >perl -MData::Dump -MWin32::LongPath -E "for (1..5) {my $lp=Win32::Lon +gPath->new; $lp->opendirL('abc') or die; dd [$lp->readdirL]}" ["M"] ["}"] ["C"] ["l"] ["}"] >icacls abc /remove:d Everyone processed file: abc Successfully processed 1 files; Failed processing 0 files >perl -MData::Dump -MWin32::LongPath -E "for (1..5) {my $lp=Win32::Lon +gPath->new; $lp->opendirL('abc') or die; dd [$lp->readdirL]}" [".", ".."] [".", ".."] [".", ".."] [".", ".."] [".", ".."] >rmdir abc >

      Thanks vr for the help!

      I am using Strawberry Perl (64-bit) 5.30.1.1-64bit.

Re^5: Function to sweep a file tree
by Anonymous Monk on Jun 22, 2020 at 08:20 UTC

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