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Re: Add support for Windows 8, first step


Hello Corinna,

On 12.10.2011 11:26, Corinna Vinschen wrote:

First of all, we need a copyright assignment from you before we can
accept non-trivial patches to Cygwin, see http://cygwin.com/contrib.html,
the "Before you get started" section.

I am going to do that just in case I actually get something working (see below).


Windows 8 will very likely support the FAST_CWD stuff, the problem is
just to find out how to find the global pointer pointing to the current
FAST_CWD structure, and then, if the FAST_CWD structure changed.

It does do that, the code looks almost the same as in Windows 7. There are some differences that I haven't figured out yet. But I might actually wait for a beta version of Windows 8 before going forward.


Therefore I don't want to disable this message.  If you're interested
to get rid of it, it would be most helpful trying to track down how to
find the global FAST_CWD pointer in W8.

If I understood the code correctly f_cwd_ptr is the location of ntdll!RtlpCurDirRef and find_fast_cwd_pointer tries to find that location. For some reason I couldn't get breakpoints working when debugging cygwin1.dll so I did some disassembling and found the correct location for ntdll!RtlpCurDirRef in Windows 8 version of ntdll (wow64).


Any hints for debugging the Cygwin dll itself as find_fast_cwd runs once per session so it has been very difficult trying to get a working breakpoint.

Teemu


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