cygwin 1.5.18-1 + Perl + open-pipe + native executable

PPC Hacker
Tue Dec 13 21:21:00 GMT 2005

Brian wrote:
>Your test case works fine with the current CVS build of Cygwin, so
>whatever was causing this has probably already been fixed.

Thanks, that's good to know.  I should have tried it myself.

Using the snaphot 12/13/2005 build of cygwin1.dll it indeed works.

Rene wrote:
>>If $prog is a native windows executable and a shell isn't required
>>(i.e., Perl does a direct fork/exec), the open hangs.

>The open doesn't hang, it's the windows executable that keeps waiting for 
>on the pipe... and the pipe is not connected.

I believe this analysis is incorrect.  If you examine the Perl script in the 
example you will see that the call to open() never returns.  Yes, the 
windows executable is waiting for input (on a connected pipe), but it never 
receives this input because the Perl script never advances past the open.

For what it's worth, this "used to work", at least on a very ancient cygwin 
(1.5.3) / Perl (5.0.8) combination.  Something along the way broke it, but 
as reported above, it has apparently been fixed again.

Thanks for the feedback!

-- Rick

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