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Date: Wed, 4 Feb 2026 22:17:00 +0100
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Subject: Why does Cygwin always use absolute paths instead of
OBJECT_ATTRIBUTES.RootDirectory?
To: cygwin AT cygwin DOT com
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From: Dan Shelton via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Dan Shelton <dan DOT f DOT shelton AT gmail DOT com>
Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

Hello,

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().

Dan
-- 
Dan Shelton - Cluster Specialist Win/Lin/Bsd

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