Re: master 2c79a8f 2/2: Use posix_spawn if possible.

[Eli Zaretskii]

> Date: Tue, 25 Jan 2022 14:25:23 +0200
> From: Saulius Menkevicius <sauliusmenkevicius@fastmail.com>
> Cc: p.stephani2@gmail.com, alan@idiocy.org, mituharu@math.s.chiba-u.ac.jp,
>  emacs-devel@gnu.org
> 
> I certainly cannot answer that, it probably does some kind of sniffing 
> on FDs and changes behaviour.
> 
> To actually figure that out I would need to build a minimal test fixture 
> for this bug/issue and submit to dotnet/runtime repo on github for them 
> to check and/or fix it.

I think there's no way around this.  We need at least to understand
what part of posix_spawn code interferes with pipe-based I/O used by
these LSP servers, and why.