Re: [PATCH] Add a fast version of fstat to cygwin port

[Alex Riesen <raa.lkml@gmail.com>]

2009/3/19 Johannes Sixt <j.sixt@viscovery.net>:
> Alex Riesen schrieb:
>> BTW, why do we have to #undef fstat, but not stat/lstat?
>
> Because stat and lstat are #defined with an argument list, but in those
> instances where the cygwin version of stat/lstat is meant, they are used
> *without* argument list (see cygwin_stat/lstat_stub), and no macro
> expansion happens, and therefore we don't need to #undef the macro.
>
> OTOH, do_fstat calls into cygwin's fstat() if the file handle is not a
> file and uses an argument list that would cause a macro expansion if it
> were not #undef'd:
>
...
>> +     /* direct non-file handles to cygwin's fstat() */
>> +     if (GetFileType(fh) != FILE_TYPE_DISK)
>> +             return fstat(fd, buf);
>
> We never do that for stat/lstat.

I see. Not immediately obvious :)
Thanks!