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Date: Mon, 22 Mar 2010 12:15:32 +0100
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Cygwin1.dll 1.7.1 causes ActivePerl 5.10 hang on gzip pipe  close on Windows Server 2003
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On Mar 19 15:13, Matthew Kidd wrote:
> >> I upgraded to Cygwin 1.7.1 on a (64-bit) Windows Server 2003 and
> >> immediately ran into trouble. It seems that Perl can no longer
> shutdown
> >> pipes related to Cygwin executables. Here is some example code:
> >> 
> >> #!/usr/bin/perl
> >> 
> >> use strict;
> >> 
> >> # my $fname = 'Y:\path\to\ratherbigfile.gz';
> >> my $fname = '/cygdrive/y/path/to/ratherbigfile.gz';
> >> 
> >> open(FH, "gzip -dc $fname |") || die 'open failed.';
> >> for (1..4) { my $fline = <FH>; print $fline; }
> >> 
> >> close(FH);
> >> print "done\n";
> >>  
> >> 
> >> Before Cygwin 1.7.1 this code ran fine. It printed out four lines,
> closed
> >> the pipe, and exited. But now it hangs at the close(FH) statement and
> the
> >> child gzip process maxes out a core continuing to uncompress the big
> >> file. I either have to kill the gzip process or the Perl process.
> This
> >> problem happens whether I use a Windows style file path or a Unix
> style
> >> file path. It doesn't matter if I use 32-bit or 64-bit Perl.
> >> 
> >> If I replace the cygwin1.dll file from the 1.7.1 installation with an
> >> older version of cygwin1.dll from a different installation
> (specifically
> >> 1.5.25 cr-0x5f1), the code above works fine (though I imagine mixing
> and
> >> matching DLL version is not a good long term solution).
> 
> > Try the latest developer snapshot from http://cygwin.com/snapshots/
> > fixes your problem.
> 
> I had no luck with the 1.7.2 cygwin1.dll from the developer snapshot.
> Since the 1.7.1 Cygwin package does not show this problem on a 32-bit
> Windows 7 box I think it is a 64-bit architecture issue.

I have no problem running your testcase with Windows 7 64 and the
latest Cygwin from CVS.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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