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To: Cygwin <cygwin AT cygwin DOT com>
Subject: Re: Use of spawnvp function makes console window appear.
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Date: Fri, 01 Jul 2016 13:53:31 -0700
From: Kaz Kylheku <kaz AT kylheku DOT com>
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On July 1, 2016 Corinna Vinschen wrote:
> On Jun 30 20:38, Kaz Kylheku wrote:
> > I tracked this down to the fhandler_console::need_invisible() call in
> > child_info_spawn::worker().
> >
> > Whatever that is supposed to do is not working properly because
> > the invisible window is perfectly visible.
> 
> Try starting the process detached:
> 
> spawnvp(_P_DETACH, argv[0], argv);

Without a doubt that will work, since the call to 
fhandler_console::need_invisible
is conditional on the mode not being _P_DETACH.

The problem is that sometimes you don't want this detach behavior.

Secondly, this child_info_spawn::worker is used underneath various 
functions: exec*, spawn*, popen, system. Not all these can pass through 
_P_DETACH at all.

(I'm only using spawnvp for the sake of producing a minimal test case).

Cheers ...

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