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From:	Dipak Gaigole <dipakgaigole AT gmail DOT com>
Date:	Thu, 8 Dec 2016 02:33:41 +0530
Message-ID:	<CADs2-=SCEMCeuzWq1bD3C+DYoBx56AiNQF2pkZhBQu=8nmnP=Q@mail.gmail.com>
Subject:	Re: Problem with chdir and GetCurrentDirectory on Windows 2016
To:	cygwin AT cygwin DOT com
X-IsSubscribed:	yes

> GetCurrentDirectory failed with ERROR_INVALID_HANDLE.  As a result the
> buffer was not populated.  What is in dirname[] is stack garbage.

As per the documentation of GetCurrentDirectory(), "If the function
succeeds, the return value specifies the number of characters that are
written to the buffer, not including the terminating null character."
So if I am not wrong, the return value 6 indicates the number of
characters written to the buffer.

Here is the output of the same program on my windows 7 system:
Administrator AT W-WIN7-56 /cygdrive/c/temp
$ ./test_cwd.exe
chdir (/cygdrive/c/Program Files) reuturned <0>
GetCurrentDirectory returned <C:\Program Files>, ret = <16>
getcwd returned </cygdrive/c/Program Files>, ret = </cygdrive/c/Program Files>

Administrator AT W-WIN7-56 /cygdrive/c/temp
$



On Thu, Dec 8, 2016 at 1:53 AM, Dipak Gaigole <dipakgaigole AT gmail DOT com> wrote:
> Hello,
>
> I am facing a very strange problem with chdir and GetCurrentDirectory.
> After calling chdir (), the call to GetCurrentDirectory () returns
> wrong value. I tested this on Windows 7 and Windows 2016. It is
> working fine on Windows 7 whereas wrong values are returned on Windows
> 2016. I guess we should see the same behavior on Windows 10 (client
> version of Windows 2016) as well.
>
> #########################################################################
> Administrator AT windows2k16vika /cygdrive/c/src
> $ cygcheck.exe -c cygwin
> Cygwin Package Information
> Package              Version        Status
> cygwin               1.7.33-1       OK
>
> Administrator AT windows2k16vika /cygdrive/c/src
> $ uname -a
> CYGWIN_NT-10.0-WOW6 windows2k16vika 1.7.33-2(0.280/5/3) 2014-11-13
> 15:45 i686 Cygwin
>
> Administrator AT windows2k16vika /cygdrive/c/src
> $ cat test_cwd.c
> #include <stdio.h>
> #include <unistd.h>
> #include <windows.h>
>
> #define BUF_SIZE 512
>
> int main()
> {
>     int ret;
>     char *dir;
>     char dirname [BUF_SIZE];
>
>     dir = "/cygdrive/c/Program Files";
>     ret = chdir (dir);
>     fprintf (stderr, "chdir (%s) reuturned <%d>\n", dir, ret);
>
>     ret = GetCurrentDirectory(BUF_SIZE, dirname);
>     if (ret)
>         fprintf (stderr, "GetCurrentDirectory returned <%s>, ret =
> <%d>\n", dirname, ret);
>
>     dir = getcwd (dirname, BUF_SIZE);
>     fprintf (stderr, "getcwd returned <%s>, ret = <%s>\n", dirname, dir);
>
>     return 0;
> }
>
> Administrator AT windows2k16vika /cygdrive/c/src
> $ gcc -g -Wall -lKernel32 test_cwd.c  -o test_cwd
>
> Administrator AT windows2k16vika /cygdrive/c/src
> $ ./test_cwd.exe
> chdir (/cygdrive/c/Program Files) reuturned <0>
> GetCurrentDirectory returned <C:\Pro>, ret = <6>
> getcwd returned </cygdrive/c/Program Files>, ret = </cygdrive/c/Program Files>
>
> Administrator AT windows2k16vika /cygdrive/c/src
> $
> #########################################################################
>
> Has anyone noticed such behavior on Windows 10 or 2016? Any
> suggestions, pointers?
>
> Thanks,
> Dipak

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