>> I am facing a very strange problem with chdir and GetCurrentDirectory.
>
> Not strange at all. The two are incompatible. When writing Cygwin
> programs, stick to the POSIX-y interface, NOT the windows interface.
>
>> After calling chdir (), the call to GetCurrentDirectory () returns
>
> chdir() is POSIX, and the POSIX counterpart is getcwd(), which will
> return the right value always. GetCurrentDirectory() is the windows
> API, which may or may not have a sane value at any given time, but more
> often than not does NOT match the value in getcwd(), and that is by
> design - because the Cygwin notion of the working directory is more
> powerful than the windows notion of the working directory, and it is
> just too expensive for cygwin to try and always keep windows up-to-date
> with the current directory when there are times that you can be in a
> cygwin directory that has no windows counterpart.
>
That perfectly explains the reason behind the behavior I am facing.
> Again, DON'T use windows API calls from a cygwin program, use POSIX
> calls instead. You WANT to use getcwd() here.
>
I dig into the source code history and found that windows APIs are
used to make some use case work. Here is the simple usecase:
##############################################
C:\Temp\appdir>dir
Volume in drive C is C_Drive
Volume Serial Number is DE87-B7F1
Directory of C:\Temp\appdir
12/08/2016 03:24 AM <DIR> .
12/08/2016 03:24 AM <DIR> ..
12/08/2016 03:18 AM <DIR> bin
11/13/2014 08:15 PM 3,247,117 cygwin1.dll
12/08/2016 03:06 AM 567 test_cwd.c
12/08/2016 03:12 AM 387,593 test_cwd.exe
3 File(s) 3,635,277 bytes
3 Dir(s) 27,981,082,624 bytes free
C:\Temp\appdir>.\test_cwd.exe "bin"
chdir (bin) reuturned <0>
GetCurrentDirectory returned <C:\Temp\appdir\bin>, ret = <18>
getcwd returned </appdir/bin>, ret = </appdir/bin>
C:\Temp\appdir>
##############################################
Please note that I have the cygwin1.dll in the "C:\Temp\appdir"
directory. So after changing the directory to "bin", the getcwd()
returned "/appdir/bin". And our requirement was to get
"/cygdrive/c/temp/appdir/bin", so the GetCurrentDirectory() approach
was used.
So in this situation, is it possible to get the cwd value as
"/cygdrive/c/temp/appdir/bin" using some cygwin API?
Thanks,
Dipak
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