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Date: Thu, 19 Apr 2012 10:14:26 -0400
From: Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: 1.7.10->1.7.13 : output from .NET programs does not get through pipeline to a visual c++ program
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On Thu, Apr 19, 2012 at 12:56:33PM +0100, somebody wrote:
>Hi all,
>
>This started in 1.7.10 and I thought this may be fixed in 1.7.12 due
>to emails in the mailing list:
>http://sourceware.org/ml/cygwin/2012-03/msg00666.html
>
>But there still seems to be a problem piping from a .net console
>application to a visual c++ console application.
>
>Using the following simple C# program complied using "csc /optimize
>/target:exe /out:./consoleout.exe Program.cs"
>
>>>>> Begin Program.cs
>namespace consoleout
>{
>    using System;
>
>    internal static class Program
>    {
>        private static void Main(string[] args)
>        {
>            foreach (var arg in args) {
>                Console.Out.WriteLine(arg);
>            }
>        }
>    }
>}
><<<< End Program.cs
>
>I can use this to output to cygwin exes OK
>$ ./consoleout.exe Hello There | cat
>Hello
>There
>$ ./consoleout.exe Hello There | grep ll
>1:Hello
>$
>
>I also created a visual c++ executable like the simple one below
>compiled with "cl /EHs readin.cxx /link"
>
>>>>> Begin readin.cxx
>#include <string>
>#include <iostream>
>
>int
>main(int argc, char** argv)
>{
>    static_cast<void>(argc);
>    static_cast<void>(argv);
>    std::string buf;
>    buf.reserve(1024);
>    while (std::getline(std::cin, buf, '\n')) {
>        std::cout << buf << '\n';
>    }
>    return EXIT_SUCCESS;
>}
><<<< End readin.cxx
>
>I can use this to output anything read in
>$ echo Hello | ./readin.exe
>Hello
>$ cat 'readin.cxx' | ./readin.exe
>#include <string>
>#include <iostream>
>
>int
>main(int argc, char** argv)
>{
>    static_cast<void>(argc);
>    static_cast<void>(argv);
>    std::string buf;
>    buf.reserve(1024);
>    while (std::getline(std::cin, buf, '\n')) {
>        std::cout << buf << '\n';
>    }
>    return EXIT_SUCCESS;
>}
>$
>
>But when combining the two, nothing happens.
>$ ./consoleout.exe Hello There | ./readin.exe
>$
>
>It "seems" as though the console out from the .net is not being
>correctly piped through to a vc++ program. I know that is a strange
>defect given all the other combinations work.
>
>The reverse works i.e. output from a visual c++ console application is
>piped correctly to a .net console application.
>
>This worked prior to 1.7.10 (1.7.9 and before).
>
>I am sorry that I cannot point to an area in the Cygwin code or
>suggest a fix, but I am hoping this is enough of a description to help
>someone find out what the issue is.

Sorry but I'm not going to set up a .NET development environment to
figure out a problem.  If someone else wants to provide a clue as
to what's going on, I'd appreciate it.

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