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Re: shared_info::init_obcaseinsensitive implemented incorrectly
- From: Nick Lowe <nick dot lowe at gmail dot com>
- To: cygwin at cygwin dot com
- Date: Tue, 21 Feb 2012 09:10:45 +0000
- Subject: Re: shared_info::init_obcaseinsensitive implemented incorrectly
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Grr, I hit send before finishing writing this. I meant to write:
"Then, check for existence of the uppercase or lowercase form of the
path (choose appropriate casing based on the existing casing) with
NtQueryAttributesFile ensuring, obviously, that the
OBJ_CASE_INSENSITIVE flag is not set."
On Tue, Feb 21, 2012 at 8:59 AM, Nick Lowe <email@example.com> wrote:
> Dear Cygwin Developers,
> shared_info::init_obcaseinsensitive in shared.cc has, in my opinion,
> been implemented incorrectly.
> The value of the obcaseinsensitive value in the registry only
> represents how the object manager will be on next reboot and not its
> present state. Cygwin uses it as if it represents the present state,
> however. This is likely to be true, but is not guaranteed to be.
> To determine the present state, first get the system root path via either:
> 1) Querying the %SystemRoot% environment variable via
> RtlExpandEnvironmentStrings_U and change it with
> RtlDosPathNameToNtPathName_U (alternatively
> RtlDosPathNameToNtPathName_U_WithStatus in Vista and later).
> 2) Querying the symbolic link target of \SystemRoot via
> NtQuerySymbolicLinkObject. (Requires administrative rights.)
> Then, check for existence of the uppercase form of the path with
> NtQueryAttributesFile ensuring, obviously, that the
> OBJ_CASE_INSENSITIVE flag is not set.
> If the the NTSTATUS value is successful, the object manager is running
> with case insensitivity, if not its running with case sensitivity.
> With regards,
> Nick Lowe
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