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Subject: Re: Pipes truncating data in cygwin from main and cygwin-3_4-branch
Date: Tue, 15 Aug 2023 09:53:16 +0900
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> On Aug 15, 2023, at 9:30, Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp> =
wrote:
>=20
> Your test case does not work in command prompt as well.
>=20
> Try
> type testfile | test-pipe sizeoftestfile
> in command prompt. It will fail.

Interesting.

>=20
> New pipe implementation since cygwin 3.4.x provides the pipes
> more similar to pipe in command prompt for non-cygwin apps.

What are the differences between these pipes? What changed?

>=20
> Since your test case is compiled with cl.exe, it is non-cygwin
> apps.

When the failure first appeared the bash shell included with Git for =
Windows was being used to run the pipe (`bash -c "cat foo | bar=E2=80=9D`)=
. The shell was started by ctest which had been run from PowerShell. Is =
this cygwin or non-cygwin?

in =
https://github.com/git-for-windows/git/issues/4464#issuecomment-1671137446=
 the author provided minimal adaption to the reproducer to compile it =
with g++ and reproduced the failure on Cygwin. It looks like the failure =
happens for both cygwin and non-cygwin. It is probably related to the =
new pipe implementation you mentioned.

Regards

    -Mark

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