Re: Why does Cygwin always use absolute paths instead of OBJECT_ATTRIBUTES.RootDirectory?
Jakob Bohm via Cygwin <[email protected]>
| Newsgroups | gmane.os.cygwin |
|---|---|
| Organization | WiseMo A/S |
| Message-ID | <[email protected]> |
On 04/02/2026 23:50, Dan Shelton via Cygwin wrote: > On Wed, 4 Feb 2026 at 22:37, Brian Inglis via Cygwin <[email protected]> wrote: >> On 2026-02-04 14:17, Dan Shelton via Cygwin wrote: >>> Why does Cygwin always use absolute paths instead of >>> OBJECT_ATTRIBUTES.RootDirectory in NtOpenFile(), >>> NtSetInformationFile() for rename and hardlinks >>> >>> This slows down Cygwin path lookups a lot, and with lots of path >>> elements each lookup with a relative RootDirectory might be a lot >>> faster, e.g. for openat(), linkat(), renameat(). >> Because volunteers' spare time is limited, and performance is good enough for >> those who might do the work: > Please do not slap me. That hurt. > > My question is about whether there are any technical issues which > prevent OBJECT_ATTRIBUTES.RootDirectory from being used in Cygwin for > openat(). > > 2nd question: Is OBJECT_ATTRIBUTES.RootDirectory really a root, and > you cannot do cd ..? > Take a look at the openat(3P) function, it seems to be what you are looking for. Enjoy Jakob -- Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10 This public discussion message is non-binding and may contain errors. WiseMo - Remote Service Management for PCs, Phones and Embedded -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple