From: Brian Inglis <Brian.Inglis@SystematicSW.ab.ca>
To: cygwin@cygwin.com
Subject: Re: Cygwin /usr/bin/stat returns "Birth: -", which value in FILE_BASIC_INFORMATION.CreationTime causes that?
Date: Fri, 5 Apr 2024 09:51:59 -0600 [thread overview]
Message-ID: <e7bebca8-1dc5-4790-9bda-6f54768cb690@SystematicSW.ab.ca> (raw)
In-Reply-To: <CANH4o6PC5umAfPzs1Br4ivRujXr+7O+UOK56h0T-aXo3RH0U2g@mail.gmail.com>
On 2024-04-04 19:08, Martin Wege via Cygwin wrote:
> On Fri, Apr 5, 2024 at 2:55 AM Brian Inglis via Cygwin
> <cygwin@cygwin.com> wrote:
>>
>> On 2024-04-04 18:05, Martin Wege via Cygwin 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?
>>
>> https://git.savannah.gnu.org/cgit/coreutils.git/tree/src/stat.c#n1618
>>
>> => tv_nsec < 0
>>
>> https://cygwin.com/git?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/fhandler/disk_file.cc#l414
>>
>> https://cygwin.com/git/?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/times.cc#l283
>
> Thank you
>
> But how can tv_nsec become negative (tv_nsec < 0)? That can only
> happen if BasicInformation.CreationTime.QuadPart is negative, right?
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
--
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
next prev parent reply other threads:[~2024-04-05 15:52 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-05 0:05 Martin Wege
2024-04-05 0:54 ` Brian Inglis
2024-04-05 1:08 ` Martin Wege
2024-04-05 15:51 ` Brian Inglis [this message]
2024-04-05 2:26 ` Win32 FILE_BASIC_INFORMATION.*Time.QuadPart - which value should be used if filesystem does not support it, so Cygwin /usr/bin/stat lists the value as '-'? Martin Wege
2024-04-09 21:14 ` Corinna Vinschen
2024-04-10 4:30 ` Brian Inglis
2024-04-10 7:59 ` Corinna Vinschen
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