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Date:	Thu, 23 Feb 2012 17:19:25 +0100
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Subject:	1.7.10 : output from .NET programs does not get through pipeline
From:	Ilya Beylin <beylin DOT i AT gmail DOT com>
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Hi all,

I started observing some very strange effects when launching .NET
programs from cygwin, after upgrading to version 1.7.10.
The example below is using the MSBuild.exe as an example, but I get
analogous results with any console program compiled for .NET.
One can see that each pipeline  works normally exactly once. The
second time the pipe does not bring anything.
I do not know if it is possible to reset it; killing all cygwin
processes and logging off apparently does not help.

$  MSBuild.exe -version
Microsoft (R) Build Engine Version 3.5.30729.1
[Microsoft .NET Framework, Version 2.0.50727.3625]
Copyright (C) Microsoft Corporation 2007. All rights reserved.

3.5.30729.1

$ MSBuild.exe -version | head -1
Microsoft (R) Build Engine Version 3.5.30729.1

$ MSBuild.exe -version | head -1

$ MSBuild.exe -version | wc
      4      20     177

$ MSBuild.exe -version | wc
      0       0       0

One program that surprisingly does not get broken so easily is "perl"

$ MSBuild.exe -version   | perl -ne print | wc
      4      20     177

$ MSBuild.exe -version   | perl -ne print | wc
      4      20     177

Output from normal DOS, windows and cygwin programs is not affected.

Output redirection with ">" works as usual.

Command substitution with $(  ) or ` ` does not work if the output
comes from .NET program:

$ echo +++ `MSBuild /help` +++
+++ +++

$ echo +++ `MSBuild.exe /help>tmp.tmp ; dos2unix tmp.tmp; head tmp.tmp` +++
dos2unix: converting file tmp.tmp to Unix format ...
+++ Microsoft (R) Build Engine Version 3.5.30729.1 [Microsoft .NET
Framework, Version 2.0.50727.3625] Copyright (C) Microsoft Corporation
2007. All rights reserved. Syntax: MSBuild.exe [options] [project
file] Description: Builds the specified targets in the project file.
If a project file is not specified, MSBuild searches the current
working directory for a file that has a file extension that ends in
"proj" and uses that file. +++

I get similar results on other computers running Windows XP, Vista and
7 with 1.7.10 installed, but not with 1.7.9.

Have you seen anything like this? How can it be fixed?

Regards
Ilya Beylin

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