lost output after pipe redirection

Wed Feb 19 11:42:05 GMT 2025

On 2025年2月19日 07:38:13 +0900
Takashi Yano wrote:
> On 2025年2月18日 21:59:36 +0100
> Marco Atzeriwrote:
> > On 18/02/2025 12:56, Takashi Yano via Cygwin wrote:
> > > Hi Marco,
> > > 
> > > On 2025年2月17日 09:28:11 +0100
> > > Marco Atzeri wrote:
> > >> Hi Takashi,
> > >>
> > >> I think there is still issue on pipe redirection output lost.
> > >> I have two cases where during package tests the test are reported as
> > >> failures as the output is missing, while running the test stand alone
> > >> the output is produced as expected.
> > >>
> > 
> > >> --------------------------------------------------------------
> > > 
> > > This is not a pipe problem, but just a path problem for gdbmtool.
> > > Please try the patch attached.
> > 
> > Thanks Takashi,
> > 
> > it works.
> > I reported the solution upstream.
>> I forgot to mention, but this problem does not occur in Linux.
> I don't know why.

I digged this deeper.
I noticed that this is not a simple path problem. Even if gdbmtool.exe
is in the path, running it fails if the directory named gdbmtool exists
in the path prior to gdmtool.exe.
Simple test case which reproduce this problem is attached. This problem
occurs if the executable is linked with libtool.
The expected output of the test case is:
Hello 1
Hello 2
Hello 3
However, the output in cygwin is:
Hello 1
127
Hello 3
The culprit would be libtool or cygwin1.dll. libtool is the large
scale shell script, so I do not find the cause so far.
-- 
Takashi Yano <takashi.yano@nifty.ne.jp>
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