On Mon, 31 Jan 2005, Brian Ford wrote: > On Sun, 30 Jan 2005, Dan Ch wrote: > > I noticed that cygwin-1.5.12-1/winsup/cygwin/fhandler.cc > > uses NtCreateFile() instead of CreateFile() on Windows NT based > > operating systems (NT, 2000, 2003, XP) for opening files. Why? I > > checked the archives for this mailing list and noted some activity > > that discuses some side affects caused by using NtCreateFile() > > instead of CreateFile() such as being able to use file names that are > > off limits to normal Windows applications. But I could not find > > anything that explains the benefits of using NtCreateFile() instead > > of CreateFile(). > > IIRC, NtCreateFile is significantly cheaper if you already have a file > handle, especially on network drives where the name to handle > translation and open are fairly expensive. The original reason was > purely performance (since I believe my company paid for some of this > optimization).
Thank you for answering my question. Now I understand why CreateFile() instead of NtCreateFile() probably did not cause any major bugs. Dan Ch. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
