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bug#22795: 25.0.91; Can't write read only file on w32
From: |
Ota, Takaaki |
Subject: |
bug#22795: 25.0.91; Can't write read only file on w32 |
Date: |
Mon, 29 Feb 2016 09:53:54 -0800 |
Mon, 29 Feb 2016 19:13:43 +0200: Eli Zaretskii <eliz@gnu.org> wrote:
> > Date: Mon, 29 Feb 2016 08:40:35 -0800
> > CC: <22795@debbugs.gnu.org>
> > From: "Ota, Takaaki" <Takaaki.Ota@am.sony.com>
> >
> > I am now very much puzzled. Here is the trace up to _wopen(). I
> > printed parameters to _wopen() and they are identical yet one succeeds
> > and the other fails.
>
> Hmm... strange, indeed.
>
> Do you have a dependency walker program? (If not, you can download it
> from http://www.dependencywalker.com/.) Can you tell whether the two
> executables differ in the versions of msvcrt.dll they are linked
> against? Or any other dynamic libraries, for that matter?
>
> Also, what is the value of errno after the _wopen call that fails?
4303 res = _wopen (mpath_w, (oflag & ~_O_CREAT) | _O_NOINHERIT,
mode);
(gdb) s
4304 if (res < 0)
(gdb) p res
$6 = -1
(gdb) p errno
$7 = 13
So it must be this.
#define EACCES 13 /* Permission denied */
>
> Finally, what about this part of my questions, did you look into this:
>
> > Also, I think by the time this code is run, the original file should
> > have been renamed to the backup-file name, so the file you are saving
> > should not exist on disk by the time we open it. If that is not the
> > case with 25.0.91, then perhaps what fails is not the open call, but
> > the rename call before that.
>
> Does the file that Emacs tries to open here, c:\d\ota\memo, exist when
> _wopen is called, and if so, is it read-only? Please check this with
> both versions of Emacs, and see if there's any differences in what
> happens.
In both cases the original file exists right before calling _wopen()
but there is a difference. On 25.0.91 the file remains read-only but
on 24.5 the file is writable right before calling _open(). Now we
have some clue here.
-Tak
- bug#22795: 25.0.91; Can't write read only file on w32, (continued)
- bug#22795: 25.0.91; Can't write read only file on w32, Eli Zaretskii, 2016/02/25
- bug#22795: 25.0.91; Can't write read only file on w32, Ota, Takaaki, 2016/02/25
- bug#22795: 25.0.91; Can't write read only file on w32, Ota, Takaaki, 2016/02/25
- bug#22795: 25.0.91; Can't write read only file on w32, Eli Zaretskii, 2016/02/25
- bug#22795: 25.0.91; Can't write read only file on w32, Ota, Takaaki, 2016/02/25
- bug#22795: 25.0.91; Can't write read only file on w32, Ota, Takaaki, 2016/02/26
- bug#22795: 25.0.91; Can't write read only file on w32, Eli Zaretskii, 2016/02/26
- bug#22795: 25.0.91; Can't write read only file on w32, Ota, Takaaki, 2016/02/29
- bug#22795: 25.0.91; Can't write read only file on w32, Eli Zaretskii, 2016/02/29
- bug#22795: 25.0.91; Can't write read only file on w32, Ota, Takaaki, 2016/02/29
- bug#22795: 25.0.91; Can't write read only file on w32,
Ota, Takaaki <=
- bug#22795: 25.0.91; Can't write read only file on w32, Ota, Takaaki, 2016/02/29
- bug#22795: 25.0.91; Can't write read only file on w32, Eli Zaretskii, 2016/02/29
- bug#22795: 25.0.91; Can't write read only file on w32, Ota, Takaaki, 2016/02/29
- bug#22795: 25.0.91; Can't write read only file on w32, Eli Zaretskii, 2016/02/29
- bug#22795: 25.0.91; Can't write read only file on w32, Ota, Takaaki, 2016/02/29
- bug#22795: 25.0.91; Can't write read only file on w32, Eli Zaretskii, 2016/02/29