Today's long path name patch

Corinna Vinschen corinna-cygwin@cygwin.com
Sat Mar 8 09:49:00 GMT 2008


Hi Brian,

thanks for testing!

On Mar  7 17:02, Brian Dessent wrote:
> Corinna Vinschen wrote:
> 
> > as I threatened the community with today, I've now checked in my patch
> > which finally enables long path names in Cygwin.  I tested it on XP,
> > 2008, and 2008 x64.  What this patch does:
> 
> Hmm.  I was playing with this code using the attached testcase.  It
> simply tries to open(O_RDWR | O_CREAT | O_TRUNC) a filename that
> contains 256 chars, nothing else.  The call to open fails with errno =
> ENOENT.  The strace from fhandler_base::open and on looks like this:
> [...]
>    25   41152 [main] tc 3304 fhandler_base::open: C0000033 =
> NtCreateFile (0x0, C0100000,
> \??\C:\cygwin\home\brian\testcases\long-file-name-create\256charfilename[+241
> underscores], io, NULL, 81, 7, 5, 4420, NULL, 0)
> [...]
> So NtCreateFile is returning STATUS_OBJECT_NAME_INVALID.  Did I
> misunderstand what's supported, is there a limitation on each
> path-component or just the total length of the absolute path?  I checked
> the attr.ObjectName and it appears to be correctly set.

Every path component is restricted to the length defined by NAME_MAX,
which is 255 bytes.  This is not different from other systems and defined 
in limits.h as per POSIX.

> > - Plain stupid bug fixing.
> 
> I did notice two cases where %s was accidently used with PUNICODE_STRING
> in a foobar_printf(), see attached patch.

Thanks for catching!


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat



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