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

[Lars Ingebrigtsen]

Juri Linkov <juri@jurta.org> writes:

> Large files from the /proc filesystem are visited incompletely,
> their file buffers are truncated at the position 65536.

It seems like this issue has been exacerbated somewhat since this was
reported.

(with-temp-buffer
  (insert-file-contents "/proc/cpuinfo")
  (buffer-size))
=> 16384

(with-temp-buffer
  (call-process "cat" nil t nil "/proc/cpuinfo")
  (buffer-size))
=> 24626

But perhaps it's dependent on the block size.  (This is on
Debian/bookworm with Emacs 29.)

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