GNU bug report logs -
#70415
30.0.50; [Cygwin] `lock-file' creates a symlink with funny name
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Reported by: Katsumi Yamaoka <yamaoka <at> jpl.org>
Date: Tue, 16 Apr 2024 12:34:04 UTC
Severity: normal
Found in version 30.0.50
Done: Ken Brown <kbrown <at> cornell.edu>
Bug is archived. No further changes may be made.
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Message #53 received at 70415 <at> debbugs.gnu.org (full text, mbox):
On 5/2/2024 10:26 AM, Ken Brown wrote:
> On 5/2/2024 2:21 AM, Eli Zaretskii wrote:
>>> Date: Wed, 1 May 2024 17:20:20 -0400
>>> Cc: yamaoka <at> jpl.org, 70415 <at> debbugs.gnu.org
>>> From: Ken Brown <kbrown <at> cornell.edu>
>>>
>>>> char const *lock_info_fmt = (boot
>>>> ? "%s@%s.%"PRIdMAX":%"PRIdMAX
>>>> : "%s@%s.%"PRIdMAX);
>>>> int len = snprintf (lock_info_str, sizeof lock_info_str,
>>>> lock_info_fmt, user_name, host_name, pid, boot);
>>>>
>>>> get_boot_sec calls get_boot_time, which is a Gnulib function (see
>>>> lib/boot-time.c). So I guess the key to unlock this puzzle is
>>>> somewhere there.
>>>
>>> I took a quick look at get_boot_time and found a bug, which may explain
>>> why some Cygwin systems behave differently from others. I've reported
>>> it here:
>>>
>>> https://lists.gnu.org/archive/html/bug-gnulib/2024-05/msg00008.html
>>
>> Thanks. This probably explains why the ":-NNNN" part sometimes
>> appears and sometimes doesn't appear in Cygwin builds of Emacs, but
>> AFAIU it does NOT explain why unlinking the symlink (when the file is
>> unlocked) fails when the lock file name includes the ":-NNNN" part.
>> Right?
>
> Yes, that's right. I still need to look into that.
It turns out that there was a Cygwin bug (already fixed in the Cygwin
development sources) that affected only version 3.5.3, and Bruno added a
workaround to Gnulib. I now see the ":NNNN" part on my system, without
a minus sign, and the lock file is deleted properly.
Katsumi, can you apply Bruno's two patches and confirm that the bug is
fixed?
Ken
This bug report was last modified 1 year and 73 days ago.
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