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On Nov 23 10:08, Michael Haubenwallner wrote: > On 11/22/2016 06:22 PM, Corinna Vinschen wrote: > > On Nov 21 16:19, Michael Haubenwallner wrote: > >> Hi Corinna, > >> > >> now working with the cygfork patches (hardlinks to retain forkability > >> beyond exe/dll update): when creating the forkable hardlink using the > >> earlier opened file handle I may get STATUS_TRANSACTION_NOT_ACTIVE. > >> > >> It turns out that when loaded 'some.dll' was readonly, then > >> rename("new/some.dll", "some.dll") uses an NTFS-transaction to drop > >> the readonly attribute, breaking the subsequent hardlink creation > >> of "/var/run/cygfork/.../soname.dll" via the original file handle. > > > > Do not use the DOS R/O attribute on non-FAT in a POSIX context. Only > > Cygwin symlinks of the Windows shortcut type should do that, and then > > only for historical reasons. And don't get me started how bad an idea > > Windows shortcut symlinks were in the first place... > > While I have not checked yet why the FILE_ATTRIBUTE_READONLY is set: > Is there a difference between the "DOS R/O attribute" and the pc.attribute > FILE_ATTRIBUTE_READONLY? No, it's one and the same. > Combined with FILE_SUPPORTS_TRANSACTIONS this triggers start_transaction() > in rename() in syscalls.cc, breaking the previously opened file handle. > > And there are no symlinks involved - I'm talking about hardlinks here. I know. The question is why was FILE_ATTRIBUTE_READONLY set at all? There's no good reason for that, unless you're on a "noacl" mount and the file permissions are set to R/O for the supposed owner. In theory those files should be left alone anyway. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat
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