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
Lines:	24
Message-ID:	<3d24c07d.sandmann@clio.rice.edu>
References:	<BC9127369D17D511B3FB00D0B79134770A8BFC30 AT snlams200 DOT netherlands DOT ncr DOT com>
NNTP-Posting-Host:	clio.rice.edu
X-Trace:	joe.rice.edu 1025818946 16906 128.42.105.3 (4 Jul 2002 21:42:26 GMT)
X-Complaints-To:	abuse AT rice DOT edu
NNTP-Posting-Date:	4 Jul 2002 21:42:26 GMT
X-NewsEditor:	ED-1.5.9
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

> 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.

- Raw text -