RFC: adding fd-passing to win32

[Ralf Habacker]

Am 22.08.22 um 12:48 schrieb Lawrence D'Oliveiro:
> That is a fundamental limitation of Windows, which Cygwin manages to
> paper over. Since Cygwin gets rid of the extra effort necessary to
> support the peculiarities of your platform, it seems like a win-win
> scenario to take advantage of that.

But it adds an additional layer of problems, as described at 
https://cygwin.com/cygwin-ug-net/highlights.html.

 > In summary, current Windows implementations make it impossible to 
implement a perfectly reliable fork, and occasional fork failures are 
inevitable.

This was the decisive reason why 
https://en.wikipedia.org/wiki/KDE_on_Cygwin was discontinued.

Ralf