I'm sorry, thanks for checking.  I didn't realize you meant v29.
I'm using GNU Emacs 28.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.33, cairo version 1.16.0) of 2022-05-30
Is there something more I can help you with?

On Wed, Nov 23, 2022 at 2:59 PM Jim Porter <jporterbugs@gmail.com> wrote:
On 11/22/2022 1:00 PM, Jeff Kowalski wrote:
> Thanks for the response and suggestion.
>  From eshell,
>       λ xdg-open file.txt
> exits immediately, without opening file.txt, and
>       λ cat | xdg-open file.txt | cat
> shows the same behavior, but
>       λ setsid -w xdg-open file.txt
> opens the file as expected.

Is this with Emacs 28 or 29? In 29, `cat | xdg-open file.txt | cat`
should work as expected (I hope).

If it doesn't, then the solution I had in mind (make `xdg-open` use a
pipe for its IO) probably wouldn't work, leaving us back at square one
for this bug...