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X-HELO:	calimero.vinschen.de
Date:	Mon, 30 May 2016 10:39:01 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: cygwin python os.stat gives wrong ctime
Message-ID:	<20160530083901.GE12694@calimero.vinschen.de>
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On May 28 21:39, Mitch Deoudes wrote:
> According to the python docs, os.stat() gives the following for st_ctime:
>=20
>     "|st_ctime| - platform dependent; time of most recent metadata change=
 on
> Unix, or the time of creation on Windows"
>=20
> To reproduce:
>     1) touch foo
>     2) wait a minute
>     3) touch foo
>     4) use python's os.stat() on the file foo
>=20
> cygwin's python 2.7.10 gives (me) the same number for mtime, ctime, and
> atime:
>=20
>     posix.stat_result(st_mode=3D33276, st_ino=3D40532396646393057,
> st_dev=3D1079873317, st_nlink=3D1, st_uid=3D1001, st_gid=3D513, st_size=
=3D0,
> st_atime=3D1464482278, st_mtime=3D1464482278, st_ctime=3D1464482278)
>=20
> However, cygwin's built-in stat command gives (correctly) the addtional
> "birth time", which is different:
>=20
>     Access: 2016-05-28 20:37:58.748977000 -0400
>     Modify: 2016-05-28 20:37:58.748977000 -0400
>     Change: 2016-05-28 20:37:58.748977000 -0400
>     Birth: 2016-05-28 20:36:34.514159100 -0400
>=20
> The non-cygwin version of Windows python from python.org (v2.7.11) behaves
> correctly as per spec:
>=20
>     nt.stat_result(st_mode=3D33206, st_ino=3D0L, st_dev=3D0L, st_nlink=3D=
0,
> st_uid=3D0, st_gid=3D0, st_size=3D0L, st_atime=3D1464482278L, st_mtime=3D=
1464482278L,
> st_ctime=3D1464482194L)
>=20
> Am I missing something, or is this a bug in cygwin's python?  You could
> argue that ctime is properly "change" and not "birth", but that's not what
> the python spec says it should be on Windows.

Cygwin's ctime is Change time, not Birth time, that's why Cygwin's stat
structure comes with an additional st_birthtime as on the BSDs.

I have no idea if python has a compile time option to make st_birthtime
visible, though.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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