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

[Paul Eggert]

On 2023-02-12 02:21, Arsen Arsenović wrote:
> ... or such.  This approach is robust and general, and I suspect it'd
> even work for named pipes.

Although indeed robust and general and it will work with named pipes in 
some cases, it still has a problem if the other side of the named pipe 
outputs data very slowly: Emacs will still seem to hang until you type C-g.

That being said, the approach is an improvement and it fixes the 
original bug report so I installed the attached and am boldly closing 
the bug report (we can reopen it if I'm wrong). The last patch in the 
attached series is the actual fix: the others are minor cleanups of this 
messy area, which I discovered while looking into the fix.

This patch does not address the abovementioned issue of named pipes, nor 
the issue of inserting very large files: the code should behave roughly 
the same as before in those two areas. These issues can be raised in 
separate bug reports if needed.

PS. I was surprised to see that Emacs master currently has several test 
case failures on GNU/Linux (specifically the latest Fedora and Ubuntu 
releases). I hope these are known and that people are working on them.

1 files did not finish:
  lisp/server-tests.log
4 files contained unexpected results:
  src/lread-tests.log
  lisp/international/mule-tests.log
  lisp/emacs-lisp/map-tests.log
  lisp/emacs-lisp/bytecomp-tests.log

0001-Improve-insert-file-contents-checking.patch
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0002-Improve-insert-file-contents-on-non-regular-files.patch
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0003-Don-t-scan-text-twice-to-guess-coding-system.patch
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0004-Fix-src-fileio.c-comment.patch
Description: Text Data

0005-Fix-insert-file-contents-on-proc-files.patch
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