Hi,

Neil Jerram <neil@ossau.uklinux.net> writes:

> ludo@gnu.org (Ludovic Courtès) writes:
>
>> That "no duplicate" test in `popen.test' leaves a zombie behind it [0].
>> The fix would be to `waitpid' the process created by `open-input-pipe'
>> (see attached patch), but that makes it hang, waiting for "sleep 999" to
>> complete.
>
> I've attached an alternative possible solution, using feedback from
> the parent to the child to avoid needing the long sleep.

Can you apply this patch?

I have a slightly modified version in NixOS, which is your patch + the
using `read' in the second "no duplicate" test.

Thanks,
Ludovic.