bug#57854: 29.0.50; Different exit code in Emacs and terminal for identical process

[Eli Zaretskii]

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> From: dalanicolai <dalanicolai@gmail.com>
> Date: Fri, 16 Sep 2022 21:20:17 +0200
> 
> The code I was using is `(call-process "pdftocio" nil nil nil 
> buffer-file-name)` (from the buffer visiting the file)

This makes the null device the standard input of the program.  What
happens if you invoke pdftocio from the shell prompt with a similar
redirection:

  $ pdftocio ... < /dev/null

(replace "..." with whatever command-line arguments you need, probably
just the file name).  What exit code does the program return then?