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
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Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10
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