On Jun 19 15:27, Ruben Van Boxem wrote: > 2013/6/19 Corinna Vinschen > > And there's another problem with this approach. Unfortunately you can't > > overwrite symlinks atomically. You have to remove the old symlink and > > create a new one. In the time between removing and recreation, another > > process could have made a wrong decision based on the non-existence of > > the symlink. You could eliminate this problem by deleting and > > recreating the symlink in an NTFS transaction, but very, very > > unfortunately Microsoft has announced to drop NTFS transactions from > > future versions of NTFS(*). > [...] > An "alternative" to TxF is doing that in Kernel mode directly of course: > http://msdn.microsoft.com/en-us/library/windows/hardware/ff565748%28v=vs.85%29.aspx
Cygwin already uses the native NT calls as described in this document. Many of them are usable from user space without having to create a kernel driver, see http://cygwin.com/cgi-bin/cvsweb.cgi/src/winsup/cygwin/syscalls.cc?rev=1.648&content-type=text/x-cvsweb-markup&cvsroot=src functions start_transaction() and stop_transaction(). However, if future NTFS versions stop supporting transactions, even using the native NT calls will be useless since the filesystem flags will have the FILE_SUPPORTS_TRANSACTIONS flag unset (as on ReFS, for instance). Corinna ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Mingw-w64-public mailing list Mingw-w64-public@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
