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

[dalanicolai]

I don't understand the answer well (my knowledge about computers is very limited),

i.e. I do not immediately understand what it means for a file to be a tty.

But also, I think the isatty() is about the TOC file, i.e. the file given as INFILE (after the `<`)

But I am not giving any INFILE (which would make the command add the TOC to the file given as argument),

Instead I simply provide a single filepath as argument so that the command simply prints the TOC.

(I hope this answer makes sense, I might be misunderstanding something)

On Fri, 16 Sept 2022 at 13:00, Eli Zaretskii <eliz@gnu.org> wrote:

> From: dalanicolai <dalanicolai@gmail.com>
> Date: Fri, 16 Sep 2022 12:00:09 +0200
>
> When looking into the `pdftocio` package I find the following piece of code
>
> ```
>     try:
>         with open_pdf(path_in) as doc:
>             if toc_file.isatty() or print_toc:
>                 # no input from user, switch to output mode and extract the toc
>                 # of pdf
>                 toc = read_toc(doc)
>                 if len(toc) == 0:
>                     print("error: no table of contents found", file=sys.stderr)
>                     sys.exit(1)
>
>                 if readable:
>                     print(pprint_toc(toc))
>                 else:
>                     print(dump_toc(toc), end="")
>                 sys.exit(0)
>
>             # an input is given, so switch to input mode
>             toc = parse_toc(toc_file)
>             write_toc(doc, toc)
> ```

Note that the above distinguishes between TTY and non-TTY input, and
call-process works via the non-TTY case, AFAIU.  So maybe what you see
is entirely expected?