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Date: Mon, 17 Feb 2025 09:28:11 +0100
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Subject: lost output after pipe redirection
To: "cygwin@cygwin.com" <cygwin@cygwin.com>
From: Marco Atzeri via Cygwin <cygwin@cygwin.com>
Reply-To: Marco Atzeri <marco.atzeri@gmail.com>
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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.

The simplest one is relative to gdbm
https://cygwin.com/cgi-bin2/jobs.cgi?id=9408

the four tests that are failing are the ones in which a input is also 
provided
--------------------------------------------------------------
gdbmtool

  30: Input from file                                 FAILED 
(gdbmtool00.at:20)
  31: Input from stdin                                FAILED 
(gdbmtool01.at:20)
  32: Input from command line                         FAILED 
(gdbmtool02.at:20)
  33: Initialization file                             FAILED 
(gdbmtool03.at:19)
--------------------------------------------------------------

but running the tests stand alone the expected output is produced

----------------------------------------------------------------
/pub/devel/gdbm/gdbm-1.24-1.x86_64/build
$ cat >input <<'_ATEOF'

status
version
quit
_ATEOF

  /pub/devel/gdbm/gdbm-1.24-1.x86_64/build
$ PATH="/pub/devel/gdbm/gdbm-1.24-1.x86_64/inst/usr/bin:${PATH}" 
gdbmtool -f input | sed 's/^GDBM version.*/GDBM version/'
Database file: junk.gdbm
Database is not open
define key string
define content string
GDBM version
--------------------------------------------------------------

It fails locally and on SCALLYWAG. Both on 3.5.7 and latest 3.6.0-dev


the other case is gdal
https://cygwin.com/cgi-bin2/jobs.cgi?id=9404

for this case the build is much more demanding and the tests pass
though cmake/ctest. I have not check all the tests in this case
but the one I checked have the same issue: running the test stand alone 
produce the expected result while during the ctest run no output is
provided.

Thanks in advance
Marco


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