On Feb 3 00:55, Dan Shelton via Cygwin wrote:
> On Mon, 2 Feb 2026 at 17:04, Corinna Vinschen via Cygwin
> <[email protected]> wrote:
> >
> > On Feb 2 14:47, Dan Shelton via Cygwin wrote:
> > > On Mon, 2 Feb 2026 at 14:40, Corinna Vinschen via Cygwin
> > > <[email protected]> wrote:
> > > >
> > > > On Feb 2 13:24, Dan Shelton via Cygwin wrote:
> > > > > I'm not sure whether the Cygwin code is correct. I did a peek with a
> > > > > kernel debugger, and I see that FILE_RENAME_INFORMATION.RootDirectory
> > > > > is always NULL if a file gets renamed to .cyg000000000xxxx. But if I
> > > > > try that with NTFS or SMB, the NtSetInformationFile() to set
> > > > > FileRenameInformation always fails.
> > > >
> > > > Your testcase is incorrect, unfortunately.
> > > >
> > > > > fri->FileNameLength = (wcslen(dstfile)+1)*sizeof(wchar_t);
> > > >
> > > > For NT file paths, never count the trailing \0 to the length:
> > > >
> > > > fri->FileNameLength = wcslen(dstfile) * sizeof (WCHAR);
> > > >
> > > > With that, your testcase works fine for me.
> > > >
> > > > On which filesystem did you see the problem?
> > >
> > > Windows NFSv3 client (the builtin one, not the newer NFSv4.1 one).
> >
> > The files in question are actually files which got renamed while
> > in use. I don't know another way to implement removing in-use files
> > on remote file systems not supporting delete POSIX semantics. If
> > somebody has a brilliant idea, https://cygwin.com/acronyms/#PTC.
>
> Did you see that these are directories, not files? How does that happen?
Yes, I saw that. Same as for files. Basically something like this:
mkdir ("dir");
fd = open ("dir", O_DIRECTORY);
unlink ("dir");
fd2 = openat (fd, "file", O_CREAT...);
Corinna
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