makecab.exe hangs on cygwin 3.1

[Jose Isaias Cabrera]

Mike Kaganski, on Thursday, January 9, 2020 12:21 PM, wrote...
>
> Hello,
>
> Using cygwin 3.1.2-1, I get a hang running a makecab.exe job started
> from a perl script.
>
> The version of perl is 5.26.3-2; Windows 10.0.18363 x64.
>
> I was able to create a minimal reproducer in perl:
>
> ############
>
> select STDERR; # non-buffering output - just to see printed messages
> print "Preparing 80 MiB of random data... ";
> open my $randfile, '<:raw', "/dev/random" or die;
> open my $testbin, '>:raw', "test.bin" or die;
> for ( my $i = 0; $i < 20480; $i++ )
> {
>      my $buf = '';
>      read $randfile, $buf, 4*1024;
>      print $testbin $buf;
> }
> close $randfile;
> close $testbin;
> print "done!\n";
>
> my $syscall = "C:/Windows/System32/makecab.exe /V3 test.bin 2\>\&1 |";
> my @makecaboutput = ();
> print "Now the actual test: this hangs with cygwin 3.1 ... ";
> open (CAB, $syscall);
> while (<CAB>) { push(@makecaboutput, $_); }
> close (CAB);
> print "makecab finished!\n"; # <<< this never prints
>
> for ( my $i = 0; $i <= $#makecaboutput; $i++ )
> {
>      print $makecaboutput[$i];
> }
>
> ############
>
> I put this code to c:/makecab/test.pm, and run from mintty as
>
> $ perl c:/makecab/test.pm
>
> The text "makecab finished!" never appears with cygwin 3.1; it appears
> as expected (several seconds, most of which is creation of random test
> data) with cygwin 3.0.7-1.
>
> Note that the test creates two files in current directory: test.bin, and
> (if succeeds) test.bi_

Works fine with cytwin 3.0.7...
$ uname -a
CYGWIN_NT-10.0-WOW HOR711318E 3.0.7(0.338/5/3) 2019-04-30 18:04 i686 Cygwin

$ perl test.pm
Preparing 80 MiB of random data... done!
Now the actual test: this hangs with cygwin 3.1 ... makecab finished!
Cabinet Maker - Lossless Data Compression Tool

  0.00% - raw=0  compressed=0
  0.04% - raw=32,768  compressed=32,775
[clip]
 99.88% - raw=83,787,776  compressed=83,805,675
 99.92% - raw=83,820,544  compressed=83,838,450
 99.96% - raw=83,853,312  compressed=83,871,225
100.00% - raw=83,886,080  compressed=83,904,000
** test.bin placed in cabinet test.bi_(47251456) on disk
100.00% [flushing current folder]
eureka@HORSE ~

thanks.

josé


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