bug#9800: Incomplete truncated file buffers from the /proc filesystem

[Ruijie Yu]

There is /proc/config.gz which does report a size, contrary to other files 
which report a size of 0. 

> On Feb 12, 2023, at 15:41, Eli Zaretskii <eliz@gnu.org> wrote:
> 
> 
>> 
>> From: Andreas Schwab <schwab@linux-m68k.org>
>> Date: Thu, 20 Oct 2011 10:44:57 +0200
>> Cc: Juri Linkov <juri@jurta.org>, 9800@debbugs.gnu.org
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>>> Does lseek work on these files?
>> 
>> No.  The contents are completely dynamic, generated on-the-fly when
>> reading.
>> 
>>> Or we could treat those files as non-regular,
>> 
>> That is the only option.
> 
> Are all the files in "/proc" of this nature?  If so, we could consider
> all of the files in that directory non-regular; if that is all that's
> needed to visit /proc/foo files, insert-file-contents already has code
> to deal with non-regular files.
> 
> Paul, do you see any downsides to such heuristic?  We could make it a
> user option if the heuristic could sometimes backfire, I guess.

Best,


RY