From: Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Multiplie Redirections in dos.
Date: Thu, 04 Jul 2002 16:39:09 CDT
Organization: Rice University, Houston TX
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> The problem is when you redirect from stdin to stdout several times.
> I've been able to narrow it down to this:

> prog.exe < somefile.txt | prog.exe
> This works. (echo the text)

> prog.exe < somefile.txt | prog.exe | prog.exe
> This works on Win 2k, but hangs on Windows XP

> prog.exe < somefile.txt | prog.exe | prog.exe | prog.exe
> This works on Win 2k, but hangs on Windows XP

> prog.exe < somefile.txt | prog.exe | prog.exe | prog.exe | prog.exe
> Hangs on both win 2k and xp.

> For some reason it might work the first the I run the program (the
> commandlines), but it will fail the second time.

This bug has been reported before; specific to the Win2K and XP family.
So far we haven't found any workaround.

It seems to be related to I/O on the pipe, the only way I've found to
clear up the mess is to kill ntvdm.exe to get it working again.