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[debbugs-tracker] bug#8371: closed (auto-revert-mode check)

From: GNU bug Tracking System
Subject: [debbugs-tracker] bug#8371: closed (auto-revert-mode check)
Date: Thu, 13 Jun 2013 16:28:02 +0000

Your message dated Thu, 13 Jun 2013 12:27:49 -0400
with message-id <address@hidden>
and subject line Re: bug#8371: auto-revert-mode check
has caused the debbugs.gnu.org bug report #8371,
regarding auto-revert-mode check
to be marked as done.

(If you believe you have received this mail in error, please contact

8371: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=8371
GNU Bug Tracking System
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--- Begin Message --- Subject: auto-revert-mode check Date: Mon, 28 Mar 2011 18:22:04 -0400
It looks like auto-revert-mode in 23.2 checks the file timestamp to see when 
the file is updated.  But I often see the file as having an extra line or two 
that Emacs doesn't pick up for a long time, until something else is added to 
the file.  I don't have time to look into it right now at work, but my guess is 
either/both (1) Emacs records the "changed" timestamp after reading the updated 
content, so the timestamp could correspond to an updated version relative to 
the buffer content; (2) Emacs isn't recording/checking the timestamp with 
enough granularity (which on this NFS file server and Linux NFS client, appears 
to be a millisecond, though file-attributes appears to return no sub-second 
component), so updates within the space of a second after Emacs rereads the 
file aren't detected.

Checking file size too would help, at least for files updated by appending.

I think file-attributes needs to be able to return sub-second granularity 
timestamps for modern operating systems, though it may require using 
non-standard interfaces, like GNU libc's stat.st_atim.tv_nsec or 
stat.st_atimensec field.

I'll see if I have time to look into this later this week.


--- End Message ---
--- Begin Message --- Subject: Re: bug#8371: auto-revert-mode check Date: Thu, 13 Jun 2013 12:27:49 -0400 User-agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/)
Version: 24.3

File time stamps are higher resolution now, so between that and
improvements to reverting, whatever issue there was here is probably

--- End Message ---

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