On 2024-04-09 15:14, Corinna Vinschen via Cygwin wrote:
On Apr 5 04:26, Martin Wege via Cygwin wrote:
On Fri, Apr 5, 2024 at 2:05 AM Martin Wege <martin.l.w...@gmail.com> wrote:
I have problems with debugging, so a quick help would be appreciated,
as I cannot figure this out after several hours of digging.
Cygwin /usr/bin/stat returns "Birth: -" for some files. Which value
must the CreationTime member of FILE_BASIC_INFORMATION have to cause
/usr/bin/stat ti return "-"? 0, -1, or something else?
In a related matter:
The Win32 FILE_BASIC_INFORMATION structure defines four time values:
LARGE_INTEGER CreationTime;
LARGE_INTEGER LastAccessTime;
LARGE_INTEGER LastWriteTime;
LARGE_INTEGER ChangeTime;
How can a filesystem indicate if it does not support a particular
timestamp, such as ChangeTime? Should ChangeTime.QuadPart then be -1,
-2 or 0, or another value?
I'm not aware of a filesystem not supporting ChangeTime, that is,
st_ctime. Usually only CreationTime (st_birthtime) is missing.
R/O media like CD/DVD-R or FS w/o write support?
I think setting the timestamp to 0 works for indicating that this kind
of timestamp is not supported. Cygwin is handling Windows timestamps
this way, but I can't find this in documentation ATM.
See upthread?:
Caller or application can set 0 to mean keep/return current value, caller or
driver can set -1 to mean don't update/return current value:
https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/ns-wdm-_file_basic_information#remarks
But the FS driver can also just fill the CreationTime field with the
same value as LastWriteTime or ChangeTime. MSFT NFS does that.
--
Take care. Thanks, Brian Inglis Calgary, Alberta, Canada
La perfection est atteinte Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut
-- Antoine de Saint-Exupéry
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