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Date:	Wed, 2 Dec 2020 13:39:05 +0900
To:	cygwin AT cygwin DOT com
Subject:	Re: cygwin1.dll > 3.1.4: Program execution fails if (WSL-)symlink
	exists and is present in PATH
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From:	Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
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On Tue, 1 Dec 2020 19:13:39 -0500
Ken Brown via Cygwin <cygwin AT cygwin DOT com> wrote:
> On 12/1/2020 4:24 AM, Mattl Mario wrote:
> > Hello,
> > 
> > Since cygwin1.dll version 3.1.5, I observed the following behavior:
> > If a symbolic link is existing in the PATH environment, programs (external from Cygwin's system directory) using cygwin1.dll cannot be executed anymore.
> > Possibly, because the Cygwin-DLL isn't found anymore.
> > 
> > Steps to reproduce:
> > 
> > cd /
> > mkdir link_test
> > cp /usr/bin/sed.exe link_test
> > ln -s link_test test
> > export PATH=/test:/link_test:/usr/bin:/bin
> > 
> > /link_test/sed cannot be executed
> > $ ldd /link_test/sed
> >          ntdll.dll => /cygdrive/c/WINDOWS/SYSTEM32/ntdll.dll (0x7ffffd960000)
> >          KERNEL32.DLL => /cygdrive/c/WINDOWS/System32/KERNEL32.DLL (0x7ffffd140000)
> >          KERNELBASE.dll => /cygdrive/c/WINDOWS/System32/KERNELBASE.dll (0x7ffffa8e0000)
> >          SYSFER.DLL => /cygdrive/c/WINDOWS/System32/SYSFER.DLL (0x550c0000)
> > 
> > -> no cygwin- DLLs found
> > 
> > If I delete the symbolic link
> > $ ll test
> > lrwxrwxrwx 1 mmattl Users 9 Dec  1 10:14 test -> link_test/
> > simply with
> > rm test
> > 
> > everything is working fine; sed can be executed
> > $ /link_test/sed
> > Usage: /link_test/sed [OPTION]... {script-only-if-no-other-script} [input-file]...
> > [...]
> > And
> > 
> > $ ldd /link_test/sed
> >          ntdll.dll => /cygdrive/c/WINDOWS/SYSTEM32/ntdll.dll (0x7ffffd960000)
> >          KERNEL32.DLL => /cygdrive/c/WINDOWS/System32/KERNEL32.DLL (0x7ffffd140000)
> >          KERNELBASE.dll => /cygdrive/c/WINDOWS/System32/KERNELBASE.dll (0x7ffffa8e0000)
> >          SYSFER.DLL => /cygdrive/c/WINDOWS/System32/SYSFER.DLL (0x550c0000)
> >          cygwin1.dll => /usr/bin/cygwin1.dll (0x180040000)
> >          cygintl-8.dll => /usr/bin/cygintl-8.dll (0x3f7110000)
> >          cygiconv-2.dll => /usr/bin/cygiconv-2.dll (0x3f7160000)
> > 
> > It would be great if you could give some advice to this issue.
> 
> I think this was fixed by commit 4b4fffe0f2390be6a5be27b6a3ceaa212a3724b2, but I 
> don't have time to check carefully, and I'm going to be AFK for a few days 
> starting tomorrow.

I can reproduce this issue with current git head even with
the commit 4b4fffe0f2390be6a5be27b6a3ceaa212a3724b2.

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
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